/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */ /* * COPYRIGHT (C) 2006,2007 * THE REGENTS OF THE UNIVERSITY OF MICHIGAN * ALL RIGHTS RESERVED * * Permission is granted to use, copy, create derivative works * and redistribute this software and such derivative works * for any purpose, so long as the name of The University of * Michigan is not used in any advertising or publicity * pertaining to the use of distribution of this software * without specific, written prior authorization. If the * above copyright notice or any other identification of the * University of Michigan is included in any copy of any * portion of this software, then the disclaimer below must * also be included. * * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION * FROM THE UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY * PURPOSE, AND WITHOUT WARRANTY BY THE UNIVERSITY OF * MICHIGAN OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING * WITHOUT LIMITATION THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE * REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE LIABLE * FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR * CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM ARISING * OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF * SUCH DAMAGES. */ #include "k5-int.h" #include "pkinit_crypto_openssl.h" #include "k5-buf.h" #include "k5-err.h" #include "k5-hex.h" #include #include #include static krb5_error_code pkinit_init_pkinit_oids(pkinit_plg_crypto_context ); static void pkinit_fini_pkinit_oids(pkinit_plg_crypto_context ); static krb5_error_code pkinit_init_dh_params(pkinit_plg_crypto_context ); static void pkinit_fini_dh_params(pkinit_plg_crypto_context ); static krb5_error_code pkinit_init_certs(pkinit_identity_crypto_context ctx); static void pkinit_fini_certs(pkinit_identity_crypto_context ctx); static krb5_error_code pkinit_init_pkcs11(pkinit_identity_crypto_context ctx); static void pkinit_fini_pkcs11(pkinit_identity_crypto_context ctx); static krb5_error_code pkinit_encode_dh_params (const BIGNUM *, const BIGNUM *, const BIGNUM *, uint8_t **, unsigned int *); static DH *decode_dh_params(const uint8_t *, unsigned int ); static int pkinit_check_dh_params(DH *dh1, DH *dh2); static krb5_error_code pkinit_sign_data (krb5_context context, pkinit_identity_crypto_context cryptoctx, unsigned char *data, unsigned int data_len, unsigned char **sig, unsigned int *sig_len); static krb5_error_code create_signature (unsigned char **, unsigned int *, unsigned char *, unsigned int, EVP_PKEY *pkey); static krb5_error_code pkinit_decode_data (krb5_context context, pkinit_identity_crypto_context cryptoctx, const uint8_t *data, unsigned int data_len, uint8_t **decoded, unsigned int *decoded_len); #ifdef DEBUG_DH static void print_dh(DH *, char *); static void print_pubkey(BIGNUM *, char *); #endif static int prepare_enc_data (const uint8_t *indata, int indata_len, uint8_t **outdata, int *outdata_len); static int openssl_callback (int, X509_STORE_CTX *); static int openssl_callback_ignore_crls (int, X509_STORE_CTX *); static int pkcs7_decrypt (krb5_context context, pkinit_identity_crypto_context id_cryptoctx, PKCS7 *p7, unsigned char **data_out, unsigned int *len_out); static ASN1_OBJECT * pkinit_pkcs7type2oid (pkinit_plg_crypto_context plg_cryptoctx, int pkcs7_type); static krb5_error_code pkinit_create_sequence_of_principal_identifiers (krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, int type, krb5_pa_data ***e_data_out); #ifndef WITHOUT_PKCS11 static krb5_error_code pkinit_find_private_key (pkinit_identity_crypto_context, CK_ATTRIBUTE_TYPE usage, CK_OBJECT_HANDLE *objp); static krb5_error_code pkinit_login (krb5_context context, pkinit_identity_crypto_context id_cryptoctx, CK_TOKEN_INFO *tip, const char *password); static krb5_error_code pkinit_open_session (krb5_context context, pkinit_identity_crypto_context id_cryptoctx); #ifdef SILLYDECRYPT CK_RV pkinit_C_Decrypt (pkinit_identity_crypto_context id_cryptoctx, CK_BYTE_PTR pEncryptedData, CK_ULONG ulEncryptedDataLen, CK_BYTE_PTR pData, CK_ULONG_PTR pulDataLen); #endif static krb5_error_code pkinit_sign_data_pkcs11 (krb5_context context, pkinit_identity_crypto_context id_cryptoctx, unsigned char *data, unsigned int data_len, unsigned char **sig, unsigned int *sig_len); static krb5_error_code pkinit_decode_data_pkcs11 (krb5_context context, pkinit_identity_crypto_context id_cryptoctx, const uint8_t *data, unsigned int data_len, uint8_t **decoded_data, unsigned int *decoded_data_len); #endif /* WITHOUT_PKCS11 */ static krb5_error_code pkinit_sign_data_fs (krb5_context context, pkinit_identity_crypto_context id_cryptoctx, unsigned char *data, unsigned int data_len, unsigned char **sig, unsigned int *sig_len); static krb5_error_code pkinit_decode_data_fs (krb5_context context, pkinit_identity_crypto_context id_cryptoctx, const uint8_t *data, unsigned int data_len, uint8_t **decoded_data, unsigned int *decoded_data_len); static krb5_error_code create_krb5_invalidCertificates(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, krb5_external_principal_identifier *** ids); static krb5_error_code create_identifiers_from_stack(STACK_OF(X509) *sk, krb5_external_principal_identifier *** ids); static int wrap_signeddata(unsigned char *data, unsigned int data_len, unsigned char **out, unsigned int *out_len); static const char * pkcs11err(int err); #ifdef HAVE_OPENSSL_CMS /* Use CMS support present in OpenSSL. */ #include #define pkinit_CMS_get0_content_signed(_cms) CMS_get0_content(_cms) #define pkinit_CMS_get0_content_data(_cms) CMS_get0_content(_cms) #define pkinit_CMS_free1_crls(_sk_x509crl) \ sk_X509_CRL_pop_free((_sk_x509crl), X509_CRL_free) #define pkinit_CMS_free1_certs(_sk_x509) \ sk_X509_pop_free((_sk_x509), X509_free) #define pkinit_CMS_SignerInfo_get_cert(_cms,_si,_x509_pp) \ CMS_SignerInfo_get0_algs(_si,NULL,_x509_pp,NULL,NULL) #else /* Fake up CMS support using PKCS7. */ #define pkinit_CMS_free1_crls(_stack_of_x509crls) /* Don't free these */ #define pkinit_CMS_free1_certs(_stack_of_x509certs) /* Don't free these */ #define CMS_NO_SIGNER_CERT_VERIFY PKCS7_NOVERIFY #define CMS_NOATTR PKCS7_NOATTR #define CMS_ContentInfo PKCS7 #define CMS_SignerInfo PKCS7_SIGNER_INFO #define d2i_CMS_ContentInfo d2i_PKCS7 #define CMS_get0_type(_p7) ((_p7)->type) #define pkinit_CMS_get0_content_signed(_p7) (&((_p7)->d.sign->contents->d.other->value.octet_string)) #define pkinit_CMS_get0_content_data(_p7) (&((_p7)->d.other->value.octet_string)) #define CMS_set1_signers_certs(_p7,_stack_of_x509,_uint) #define CMS_get0_SignerInfos PKCS7_get_signer_info #define stack_st_CMS_SignerInfo stack_st_PKCS7_SIGNER_INFO #undef sk_CMS_SignerInfo_value #define sk_CMS_SignerInfo_value sk_PKCS7_SIGNER_INFO_value #define CMS_get0_eContentType(_p7) (_p7->d.sign->contents->type) #define CMS_verify PKCS7_verify #define CMS_get1_crls(_p7) (_p7->d.sign->crl) #define CMS_get1_certs(_p7) (_p7->d.sign->cert) #define CMS_ContentInfo_free(_p7) PKCS7_free(_p7) #define pkinit_CMS_SignerInfo_get_cert(_p7,_si,_x509_pp) \ (*_x509_pp) = PKCS7_cert_from_signer_info(_p7,_si) #endif #if OPENSSL_VERSION_NUMBER < 0x10100000L /* 1.1 standardizes constructor and destructor names, renaming * EVP_MD_CTX_{create,destroy} and deprecating ASN1_STRING_data. */ #define EVP_MD_CTX_new EVP_MD_CTX_create #define EVP_MD_CTX_free EVP_MD_CTX_destroy #define ASN1_STRING_get0_data ASN1_STRING_data /* 1.1 makes many handle types opaque and adds accessors. Add compatibility * versions of the new accessors we use for pre-1.1. */ #define OBJ_get0_data(o) ((o)->data) #define OBJ_length(o) ((o)->length) #define DH_set0_pqg compat_dh_set0_pqg static int compat_dh_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g) { /* The real function frees the old values and does argument checking, but * our code doesn't need that. */ dh->p = p; dh->q = q; dh->g = g; return 1; } #define DH_get0_pqg compat_dh_get0_pqg static void compat_dh_get0_pqg(const DH *dh, const BIGNUM **p, const BIGNUM **q, const BIGNUM **g) { if (p != NULL) *p = dh->p; if (q != NULL) *q = dh->q; if (g != NULL) *g = dh->g; } #define DH_get0_key compat_dh_get0_key static void compat_dh_get0_key(const DH *dh, const BIGNUM **pub, const BIGNUM **priv) { if (pub != NULL) *pub = dh->pub_key; if (priv != NULL) *priv = dh->priv_key; } /* Return true if the cert c includes a key usage which doesn't include u. * Define using direct member access for pre-1.1. */ #define ku_reject(c, u) \ (((c)->ex_flags & EXFLAG_KUSAGE) && !((c)->ex_kusage & (u))) #else /* OPENSSL_VERSION_NUMBER >= 0x10100000L */ /* Return true if the cert x includes a key usage which doesn't include u. */ #define ku_reject(c, u) (!(X509_get_key_usage(c) & (u))) #endif static struct pkcs11_errstrings { short code; char *text; } pkcs11_errstrings[] = { { 0x0, "ok" }, { 0x1, "cancel" }, { 0x2, "host memory" }, { 0x3, "slot id invalid" }, { 0x5, "general error" }, { 0x6, "function failed" }, { 0x7, "arguments bad" }, { 0x8, "no event" }, { 0x9, "need to create threads" }, { 0xa, "cant lock" }, { 0x10, "attribute read only" }, { 0x11, "attribute sensitive" }, { 0x12, "attribute type invalid" }, { 0x13, "attribute value invalid" }, { 0x20, "data invalid" }, { 0x21, "data len range" }, { 0x30, "device error" }, { 0x31, "device memory" }, { 0x32, "device removed" }, { 0x40, "encrypted data invalid" }, { 0x41, "encrypted data len range" }, { 0x50, "function canceled" }, { 0x51, "function not parallel" }, { 0x54, "function not supported" }, { 0x60, "key handle invalid" }, { 0x62, "key size range" }, { 0x63, "key type inconsistent" }, { 0x64, "key not needed" }, { 0x65, "key changed" }, { 0x66, "key needed" }, { 0x67, "key indigestible" }, { 0x68, "key function not permitted" }, { 0x69, "key not wrappable" }, { 0x6a, "key unextractable" }, { 0x70, "mechanism invalid" }, { 0x71, "mechanism param invalid" }, { 0x82, "object handle invalid" }, { 0x90, "operation active" }, { 0x91, "operation not initialized" }, { 0xa0, "pin incorrect" }, { 0xa1, "pin invalid" }, { 0xa2, "pin len range" }, { 0xa3, "pin expired" }, { 0xa4, "pin locked" }, { 0xb0, "session closed" }, { 0xb1, "session count" }, { 0xb3, "session handle invalid" }, { 0xb4, "session parallel not supported" }, { 0xb5, "session read only" }, { 0xb6, "session exists" }, { 0xb7, "session read only exists" }, { 0xb8, "session read write so exists" }, { 0xc0, "signature invalid" }, { 0xc1, "signature len range" }, { 0xd0, "template incomplete" }, { 0xd1, "template inconsistent" }, { 0xe0, "token not present" }, { 0xe1, "token not recognized" }, { 0xe2, "token write protected" }, { 0xf0, "unwrapping key handle invalid" }, { 0xf1, "unwrapping key size range" }, { 0xf2, "unwrapping key type inconsistent" }, { 0x100, "user already logged in" }, { 0x101, "user not logged in" }, { 0x102, "user pin not initialized" }, { 0x103, "user type invalid" }, { 0x104, "user another already logged in" }, { 0x105, "user too many types" }, { 0x110, "wrapped key invalid" }, { 0x112, "wrapped key len range" }, { 0x113, "wrapping key handle invalid" }, { 0x114, "wrapping key size range" }, { 0x115, "wrapping key type inconsistent" }, { 0x120, "random seed not supported" }, { 0x121, "random no rng" }, { 0x130, "domain params invalid" }, { 0x150, "buffer too small" }, { 0x160, "saved state invalid" }, { 0x170, "information sensitive" }, { 0x180, "state unsaveable" }, { 0x190, "cryptoki not initialized" }, { 0x191, "cryptoki already initialized" }, { 0x1a0, "mutex bad" }, { 0x1a1, "mutex not locked" }, { 0x200, "function rejected" }, { -1, NULL } }; /* DH parameters */ static uint8_t oakley_1024[128] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2, 0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1, 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6, 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD, 0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D, 0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45, 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9, 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED, 0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11, 0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE6, 0x53, 0x81, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; static uint8_t oakley_2048[2048/8] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2, 0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1, 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6, 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD, 0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D, 0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45, 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9, 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED, 0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11, 0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE4, 0x5B, 0x3D, 0xC2, 0x00, 0x7C, 0xB8, 0xA1, 0x63, 0xBF, 0x05, 0x98, 0xDA, 0x48, 0x36, 0x1C, 0x55, 0xD3, 0x9A, 0x69, 0x16, 0x3F, 0xA8, 0xFD, 0x24, 0xCF, 0x5F, 0x83, 0x65, 0x5D, 0x23, 0xDC, 0xA3, 0xAD, 0x96, 0x1C, 0x62, 0xF3, 0x56, 0x20, 0x85, 0x52, 0xBB, 0x9E, 0xD5, 0x29, 0x07, 0x70, 0x96, 0x96, 0x6D, 0x67, 0x0C, 0x35, 0x4E, 0x4A, 0xBC, 0x98, 0x04, 0xF1, 0x74, 0x6C, 0x08, 0xCA, 0x18, 0x21, 0x7C, 0x32, 0x90, 0x5E, 0x46, 0x2E, 0x36, 0xCE, 0x3B, 0xE3, 0x9E, 0x77, 0x2C, 0x18, 0x0E, 0x86, 0x03, 0x9B, 0x27, 0x83, 0xA2, 0xEC, 0x07, 0xA2, 0x8F, 0xB5, 0xC5, 0x5D, 0xF0, 0x6F, 0x4C, 0x52, 0xC9, 0xDE, 0x2B, 0xCB, 0xF6, 0x95, 0x58, 0x17, 0x18, 0x39, 0x95, 0x49, 0x7C, 0xEA, 0x95, 0x6A, 0xE5, 0x15, 0xD2, 0x26, 0x18, 0x98, 0xFA, 0x05, 0x10, 0x15, 0x72, 0x8E, 0x5A, 0x8A, 0xAC, 0xAA, 0x68, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; static uint8_t oakley_4096[4096/8] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2, 0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1, 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6, 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD, 0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D, 0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45, 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9, 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED, 0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11, 0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE4, 0x5B, 0x3D, 0xC2, 0x00, 0x7C, 0xB8, 0xA1, 0x63, 0xBF, 0x05, 0x98, 0xDA, 0x48, 0x36, 0x1C, 0x55, 0xD3, 0x9A, 0x69, 0x16, 0x3F, 0xA8, 0xFD, 0x24, 0xCF, 0x5F, 0x83, 0x65, 0x5D, 0x23, 0xDC, 0xA3, 0xAD, 0x96, 0x1C, 0x62, 0xF3, 0x56, 0x20, 0x85, 0x52, 0xBB, 0x9E, 0xD5, 0x29, 0x07, 0x70, 0x96, 0x96, 0x6D, 0x67, 0x0C, 0x35, 0x4E, 0x4A, 0xBC, 0x98, 0x04, 0xF1, 0x74, 0x6C, 0x08, 0xCA, 0x18, 0x21, 0x7C, 0x32, 0x90, 0x5E, 0x46, 0x2E, 0x36, 0xCE, 0x3B, 0xE3, 0x9E, 0x77, 0x2C, 0x18, 0x0E, 0x86, 0x03, 0x9B, 0x27, 0x83, 0xA2, 0xEC, 0x07, 0xA2, 0x8F, 0xB5, 0xC5, 0x5D, 0xF0, 0x6F, 0x4C, 0x52, 0xC9, 0xDE, 0x2B, 0xCB, 0xF6, 0x95, 0x58, 0x17, 0x18, 0x39, 0x95, 0x49, 0x7C, 0xEA, 0x95, 0x6A, 0xE5, 0x15, 0xD2, 0x26, 0x18, 0x98, 0xFA, 0x05, 0x10, 0x15, 0x72, 0x8E, 0x5A, 0x8A, 0xAA, 0xC4, 0x2D, 0xAD, 0x33, 0x17, 0x0D, 0x04, 0x50, 0x7A, 0x33, 0xA8, 0x55, 0x21, 0xAB, 0xDF, 0x1C, 0xBA, 0x64, 0xEC, 0xFB, 0x85, 0x04, 0x58, 0xDB, 0xEF, 0x0A, 0x8A, 0xEA, 0x71, 0x57, 0x5D, 0x06, 0x0C, 0x7D, 0xB3, 0x97, 0x0F, 0x85, 0xA6, 0xE1, 0xE4, 0xC7, 0xAB, 0xF5, 0xAE, 0x8C, 0xDB, 0x09, 0x33, 0xD7, 0x1E, 0x8C, 0x94, 0xE0, 0x4A, 0x25, 0x61, 0x9D, 0xCE, 0xE3, 0xD2, 0x26, 0x1A, 0xD2, 0xEE, 0x6B, 0xF1, 0x2F, 0xFA, 0x06, 0xD9, 0x8A, 0x08, 0x64, 0xD8, 0x76, 0x02, 0x73, 0x3E, 0xC8, 0x6A, 0x64, 0x52, 0x1F, 0x2B, 0x18, 0x17, 0x7B, 0x20, 0x0C, 0xBB, 0xE1, 0x17, 0x57, 0x7A, 0x61, 0x5D, 0x6C, 0x77, 0x09, 0x88, 0xC0, 0xBA, 0xD9, 0x46, 0xE2, 0x08, 0xE2, 0x4F, 0xA0, 0x74, 0xE5, 0xAB, 0x31, 0x43, 0xDB, 0x5B, 0xFC, 0xE0, 0xFD, 0x10, 0x8E, 0x4B, 0x82, 0xD1, 0x20, 0xA9, 0x21, 0x08, 0x01, 0x1A, 0x72, 0x3C, 0x12, 0xA7, 0x87, 0xE6, 0xD7, 0x88, 0x71, 0x9A, 0x10, 0xBD, 0xBA, 0x5B, 0x26, 0x99, 0xC3, 0x27, 0x18, 0x6A, 0xF4, 0xE2, 0x3C, 0x1A, 0x94, 0x68, 0x34, 0xB6, 0x15, 0x0B, 0xDA, 0x25, 0x83, 0xE9, 0xCA, 0x2A, 0xD4, 0x4C, 0xE8, 0xDB, 0xBB, 0xC2, 0xDB, 0x04, 0xDE, 0x8E, 0xF9, 0x2E, 0x8E, 0xFC, 0x14, 0x1F, 0xBE, 0xCA, 0xA6, 0x28, 0x7C, 0x59, 0x47, 0x4E, 0x6B, 0xC0, 0x5D, 0x99, 0xB2, 0x96, 0x4F, 0xA0, 0x90, 0xC3, 0xA2, 0x23, 0x3B, 0xA1, 0x86, 0x51, 0x5B, 0xE7, 0xED, 0x1F, 0x61, 0x29, 0x70, 0xCE, 0xE2, 0xD7, 0xAF, 0xB8, 0x1B, 0xDD, 0x76, 0x21, 0x70, 0x48, 0x1C, 0xD0, 0x06, 0x91, 0x27, 0xD5, 0xB0, 0x5A, 0xA9, 0x93, 0xB4, 0xEA, 0x98, 0x8D, 0x8F, 0xDD, 0xC1, 0x86, 0xFF, 0xB7, 0xDC, 0x90, 0xA6, 0xC0, 0x8F, 0x4D, 0xF4, 0x35, 0xC9, 0x34, 0x06, 0x31, 0x99, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; MAKE_INIT_FUNCTION(pkinit_openssl_init); static krb5_error_code oerr(krb5_context context, krb5_error_code code, const char *fmt, ...) #if !defined(__cplusplus) && (__GNUC__ > 2) __attribute__((__format__(__printf__, 3, 4))) #endif ; /* * Set an error string containing the formatted arguments and the first pending * OpenSSL error. Write the formatted arguments and all pending OpenSSL error * messages to the trace log. Return code, or KRB5KDC_ERR_PREAUTH_FAILED if * code is 0. */ static krb5_error_code oerr(krb5_context context, krb5_error_code code, const char *fmt, ...) { unsigned long err; va_list ap; char *str, buf[128]; int r; if (!code) code = KRB5KDC_ERR_PREAUTH_FAILED; va_start(ap, fmt); r = vasprintf(&str, fmt, ap); va_end(ap); if (r < 0) return code; err = ERR_peek_error(); if (err) { krb5_set_error_message(context, code, _("%s: %s"), str, ERR_reason_error_string(err)); } else { krb5_set_error_message(context, code, "%s", str); } TRACE_PKINIT_OPENSSL_ERROR(context, str); while ((err = ERR_get_error()) != 0) { ERR_error_string_n(err, buf, sizeof(buf)); TRACE_PKINIT_OPENSSL_ERROR(context, buf); } free(str); return code; } /* * Set an appropriate error string containing msg for a certificate * verification failure from certctx. Write the message and all pending * OpenSSL error messages to the trace log. Return code, or * KRB5KDC_ERR_PREAUTH_FAILED if code is 0. */ static krb5_error_code oerr_cert(krb5_context context, krb5_error_code code, X509_STORE_CTX *certctx, const char *msg) { int depth = X509_STORE_CTX_get_error_depth(certctx); int err = X509_STORE_CTX_get_error(certctx); const char *errstr = X509_verify_cert_error_string(err); return oerr(context, code, _("%s (depth %d): %s"), msg, depth, errstr); } krb5_error_code pkinit_init_plg_crypto(pkinit_plg_crypto_context *cryptoctx) { krb5_error_code retval = ENOMEM; pkinit_plg_crypto_context ctx = NULL; (void)CALL_INIT_FUNCTION(pkinit_openssl_init); ctx = malloc(sizeof(*ctx)); if (ctx == NULL) goto out; memset(ctx, 0, sizeof(*ctx)); pkiDebug("%s: initializing openssl crypto context at %p\n", __FUNCTION__, ctx); retval = pkinit_init_pkinit_oids(ctx); if (retval) goto out; retval = pkinit_init_dh_params(ctx); if (retval) goto out; *cryptoctx = ctx; out: if (retval && ctx != NULL) pkinit_fini_plg_crypto(ctx); return retval; } void pkinit_fini_plg_crypto(pkinit_plg_crypto_context cryptoctx) { pkiDebug("%s: freeing context at %p\n", __FUNCTION__, cryptoctx); if (cryptoctx == NULL) return; pkinit_fini_pkinit_oids(cryptoctx); pkinit_fini_dh_params(cryptoctx); free(cryptoctx); } krb5_error_code pkinit_init_identity_crypto(pkinit_identity_crypto_context *idctx) { krb5_error_code retval = ENOMEM; pkinit_identity_crypto_context ctx = NULL; ctx = malloc(sizeof(*ctx)); if (ctx == NULL) goto out; memset(ctx, 0, sizeof(*ctx)); ctx->identity = NULL; retval = pkinit_init_certs(ctx); if (retval) goto out; retval = pkinit_init_pkcs11(ctx); if (retval) goto out; pkiDebug("%s: returning ctx at %p\n", __FUNCTION__, ctx); *idctx = ctx; out: if (retval) { if (ctx) pkinit_fini_identity_crypto(ctx); } return retval; } void pkinit_fini_identity_crypto(pkinit_identity_crypto_context idctx) { if (idctx == NULL) return; pkiDebug("%s: freeing ctx at %p\n", __FUNCTION__, idctx); if (idctx->deferred_ids != NULL) pkinit_free_deferred_ids(idctx->deferred_ids); free(idctx->identity); pkinit_fini_certs(idctx); pkinit_fini_pkcs11(idctx); free(idctx); } krb5_error_code pkinit_init_req_crypto(pkinit_req_crypto_context *cryptoctx) { krb5_error_code retval = ENOMEM; pkinit_req_crypto_context ctx = NULL; ctx = malloc(sizeof(*ctx)); if (ctx == NULL) goto out; memset(ctx, 0, sizeof(*ctx)); ctx->dh = NULL; ctx->received_cert = NULL; *cryptoctx = ctx; pkiDebug("%s: returning ctx at %p\n", __FUNCTION__, ctx); retval = 0; out: if (retval) free(ctx); return retval; } void pkinit_fini_req_crypto(pkinit_req_crypto_context req_cryptoctx) { if (req_cryptoctx == NULL) return; pkiDebug("%s: freeing ctx at %p\n", __FUNCTION__, req_cryptoctx); if (req_cryptoctx->dh != NULL) DH_free(req_cryptoctx->dh); if (req_cryptoctx->received_cert != NULL) X509_free(req_cryptoctx->received_cert); free(req_cryptoctx); } static krb5_error_code pkinit_init_pkinit_oids(pkinit_plg_crypto_context ctx) { ctx->id_pkinit_san = OBJ_txt2obj("1.3.6.1.5.2.2", 1); if (ctx->id_pkinit_san == NULL) return ENOMEM; ctx->id_pkinit_authData = OBJ_txt2obj("1.3.6.1.5.2.3.1", 1); if (ctx->id_pkinit_authData == NULL) return ENOMEM; ctx->id_pkinit_DHKeyData = OBJ_txt2obj("1.3.6.1.5.2.3.2", 1); if (ctx->id_pkinit_DHKeyData == NULL) return ENOMEM; ctx->id_pkinit_rkeyData = OBJ_txt2obj("1.3.6.1.5.2.3.3", 1); if (ctx->id_pkinit_rkeyData == NULL) return ENOMEM; ctx->id_pkinit_KPClientAuth = OBJ_txt2obj("1.3.6.1.5.2.3.4", 1); if (ctx->id_pkinit_KPClientAuth == NULL) return ENOMEM; ctx->id_pkinit_KPKdc = OBJ_txt2obj("1.3.6.1.5.2.3.5", 1); if (ctx->id_pkinit_KPKdc == NULL) return ENOMEM; ctx->id_ms_kp_sc_logon = OBJ_txt2obj("1.3.6.1.4.1.311.20.2.2", 1); if (ctx->id_ms_kp_sc_logon == NULL) return ENOMEM; ctx->id_ms_san_upn = OBJ_txt2obj("1.3.6.1.4.1.311.20.2.3", 1); if (ctx->id_ms_san_upn == NULL) return ENOMEM; ctx->id_kp_serverAuth = OBJ_txt2obj("1.3.6.1.5.5.7.3.1", 1); if (ctx->id_kp_serverAuth == NULL) return ENOMEM; return 0; } static krb5_error_code get_cert(char *filename, X509 **retcert) { X509 *cert = NULL; BIO *tmp = NULL; int code; krb5_error_code retval; if (filename == NULL || retcert == NULL) return EINVAL; *retcert = NULL; tmp = BIO_new(BIO_s_file()); if (tmp == NULL) return ENOMEM; code = BIO_read_filename(tmp, filename); if (code == 0) { retval = errno; goto cleanup; } cert = (X509 *) PEM_read_bio_X509(tmp, NULL, NULL, NULL); if (cert == NULL) { retval = EIO; pkiDebug("failed to read certificate from %s\n", filename); goto cleanup; } *retcert = cert; retval = 0; cleanup: if (tmp != NULL) BIO_free(tmp); return retval; } struct get_key_cb_data { krb5_context context; pkinit_identity_crypto_context id_cryptoctx; const char *fsname; char *filename; const char *password; }; static int get_key_cb(char *buf, int size, int rwflag, void *userdata) { struct get_key_cb_data *data = userdata; pkinit_identity_crypto_context id_cryptoctx; krb5_data rdat; krb5_prompt kprompt; krb5_prompt_type prompt_type; krb5_error_code retval; char *prompt; if (data->id_cryptoctx->defer_id_prompt) { /* Supply the identity name to be passed to a responder callback. */ pkinit_set_deferred_id(&data->id_cryptoctx->deferred_ids, data->fsname, 0, NULL); return -1; } if (data->password == NULL) { /* We don't already have a password to use, so prompt for one. */ if (data->id_cryptoctx->prompter == NULL) return -1; if (asprintf(&prompt, "%s %s", _("Pass phrase for"), data->filename) < 0) return -1; rdat.data = buf; rdat.length = size; kprompt.prompt = prompt; kprompt.hidden = 1; kprompt.reply = &rdat; prompt_type = KRB5_PROMPT_TYPE_PREAUTH; /* PROMPTER_INVOCATION */ k5int_set_prompt_types(data->context, &prompt_type); id_cryptoctx = data->id_cryptoctx; retval = (data->id_cryptoctx->prompter)(data->context, id_cryptoctx->prompter_data, NULL, NULL, 1, &kprompt); k5int_set_prompt_types(data->context, 0); free(prompt); if (retval != 0) return -1; } else { /* Just use the already-supplied password. */ rdat.length = strlen(data->password); if ((int)rdat.length >= size) return -1; snprintf(buf, size, "%s", data->password); } return (int)rdat.length; } static krb5_error_code get_key(krb5_context context, pkinit_identity_crypto_context id_cryptoctx, char *filename, const char *fsname, EVP_PKEY **retkey, const char *password) { EVP_PKEY *pkey = NULL; BIO *tmp = NULL; struct get_key_cb_data cb_data; int code; krb5_error_code retval; if (filename == NULL || retkey == NULL) return EINVAL; tmp = BIO_new(BIO_s_file()); if (tmp == NULL) return ENOMEM; code = BIO_read_filename(tmp, filename); if (code == 0) { retval = errno; goto cleanup; } cb_data.context = context; cb_data.id_cryptoctx = id_cryptoctx; cb_data.filename = filename; cb_data.fsname = fsname; cb_data.password = password; pkey = PEM_read_bio_PrivateKey(tmp, NULL, get_key_cb, &cb_data); if (pkey == NULL && !id_cryptoctx->defer_id_prompt) { retval = EIO; pkiDebug("failed to read private key from %s\n", filename); goto cleanup; } *retkey = pkey; retval = 0; cleanup: if (tmp != NULL) BIO_free(tmp); return retval; } static void pkinit_fini_pkinit_oids(pkinit_plg_crypto_context ctx) { if (ctx == NULL) return; ASN1_OBJECT_free(ctx->id_pkinit_san); ASN1_OBJECT_free(ctx->id_pkinit_authData); ASN1_OBJECT_free(ctx->id_pkinit_DHKeyData); ASN1_OBJECT_free(ctx->id_pkinit_rkeyData); ASN1_OBJECT_free(ctx->id_pkinit_KPClientAuth); ASN1_OBJECT_free(ctx->id_pkinit_KPKdc); ASN1_OBJECT_free(ctx->id_ms_kp_sc_logon); ASN1_OBJECT_free(ctx->id_ms_san_upn); ASN1_OBJECT_free(ctx->id_kp_serverAuth); } /* Construct an OpenSSL DH object for an Oakley group. */ static DH * make_oakley_dh(uint8_t *prime, size_t len) { DH *dh = NULL; BIGNUM *p = NULL, *q = NULL, *g = NULL; p = BN_bin2bn(prime, len, NULL); if (p == NULL) goto cleanup; q = BN_new(); if (q == NULL) goto cleanup; if (!BN_rshift1(q, p)) goto cleanup; g = BN_new(); if (g == NULL) goto cleanup; if (!BN_set_word(g, DH_GENERATOR_2)) goto cleanup; dh = DH_new(); if (dh == NULL) goto cleanup; DH_set0_pqg(dh, p, q, g); p = g = q = NULL; cleanup: BN_free(p); BN_free(q); BN_free(g); return dh; } static krb5_error_code pkinit_init_dh_params(pkinit_plg_crypto_context plgctx) { krb5_error_code retval = ENOMEM; plgctx->dh_1024 = make_oakley_dh(oakley_1024, sizeof(oakley_1024)); if (plgctx->dh_1024 == NULL) goto cleanup; plgctx->dh_2048 = make_oakley_dh(oakley_2048, sizeof(oakley_2048)); if (plgctx->dh_2048 == NULL) goto cleanup; plgctx->dh_4096 = make_oakley_dh(oakley_4096, sizeof(oakley_4096)); if (plgctx->dh_4096 == NULL) goto cleanup; retval = 0; cleanup: if (retval) pkinit_fini_dh_params(plgctx); return retval; } static void pkinit_fini_dh_params(pkinit_plg_crypto_context plgctx) { if (plgctx->dh_1024 != NULL) DH_free(plgctx->dh_1024); if (plgctx->dh_2048 != NULL) DH_free(plgctx->dh_2048); if (plgctx->dh_4096 != NULL) DH_free(plgctx->dh_4096); plgctx->dh_1024 = plgctx->dh_2048 = plgctx->dh_4096 = NULL; } static krb5_error_code pkinit_init_certs(pkinit_identity_crypto_context ctx) { krb5_error_code retval = ENOMEM; int i; for (i = 0; i < MAX_CREDS_ALLOWED; i++) ctx->creds[i] = NULL; ctx->my_certs = NULL; ctx->cert_index = 0; ctx->my_key = NULL; ctx->trustedCAs = NULL; ctx->intermediateCAs = NULL; ctx->revoked = NULL; retval = 0; return retval; } static void pkinit_fini_certs(pkinit_identity_crypto_context ctx) { if (ctx == NULL) return; if (ctx->my_certs != NULL) sk_X509_pop_free(ctx->my_certs, X509_free); if (ctx->my_key != NULL) EVP_PKEY_free(ctx->my_key); if (ctx->trustedCAs != NULL) sk_X509_pop_free(ctx->trustedCAs, X509_free); if (ctx->intermediateCAs != NULL) sk_X509_pop_free(ctx->intermediateCAs, X509_free); if (ctx->revoked != NULL) sk_X509_CRL_pop_free(ctx->revoked, X509_CRL_free); } static krb5_error_code pkinit_init_pkcs11(pkinit_identity_crypto_context ctx) { krb5_error_code retval = ENOMEM; #ifndef WITHOUT_PKCS11 ctx->p11_module_name = strdup(PKCS11_MODNAME); if (ctx->p11_module_name == NULL) return retval; ctx->p11_module = NULL; ctx->slotid = PK_NOSLOT; ctx->token_label = NULL; ctx->cert_label = NULL; ctx->session = CK_INVALID_HANDLE; ctx->p11 = NULL; #endif ctx->pkcs11_method = 0; retval = 0; return retval; } static void pkinit_fini_pkcs11(pkinit_identity_crypto_context ctx) { #ifndef WITHOUT_PKCS11 if (ctx == NULL) return; if (ctx->p11 != NULL) { if (ctx->session != CK_INVALID_HANDLE) { ctx->p11->C_CloseSession(ctx->session); ctx->session = CK_INVALID_HANDLE; } ctx->p11->C_Finalize(NULL_PTR); ctx->p11 = NULL; } if (ctx->p11_module != NULL) { krb5int_close_plugin(ctx->p11_module); ctx->p11_module = NULL; } free(ctx->p11_module_name); free(ctx->token_label); free(ctx->cert_id); free(ctx->cert_label); #endif } krb5_error_code pkinit_identity_set_prompter(pkinit_identity_crypto_context id_cryptoctx, krb5_prompter_fct prompter, void *prompter_data) { id_cryptoctx->prompter = prompter; id_cryptoctx->prompter_data = prompter_data; return 0; } /* Create a CMS ContentInfo of type oid containing the octet string in data. */ static krb5_error_code create_contentinfo(krb5_context context, ASN1_OBJECT *oid, unsigned char *data, size_t data_len, PKCS7 **p7_out) { PKCS7 *p7 = NULL; ASN1_OCTET_STRING *ostr = NULL; *p7_out = NULL; ostr = ASN1_OCTET_STRING_new(); if (ostr == NULL) goto oom; if (!ASN1_OCTET_STRING_set(ostr, (unsigned char *)data, data_len)) goto oom; p7 = PKCS7_new(); if (p7 == NULL) goto oom; p7->type = OBJ_dup(oid); if (p7->type == NULL) goto oom; p7->d.other = ASN1_TYPE_new(); if (p7->d.other == NULL) goto oom; p7->d.other->type = V_ASN1_OCTET_STRING; p7->d.other->value.octet_string = ostr; *p7_out = p7; return 0; oom: if (ostr != NULL) ASN1_OCTET_STRING_free(ostr); if (p7 != NULL) PKCS7_free(p7); return ENOMEM; } krb5_error_code cms_contentinfo_create(krb5_context context, /* IN */ pkinit_plg_crypto_context plg_cryptoctx, /* IN */ pkinit_req_crypto_context req_cryptoctx, /* IN */ pkinit_identity_crypto_context id_cryptoctx, /* IN */ int cms_msg_type, unsigned char *data, unsigned int data_len, unsigned char **out_data, unsigned int *out_data_len) { krb5_error_code retval = ENOMEM; ASN1_OBJECT *oid; PKCS7 *p7 = NULL; unsigned char *p; /* Pick the correct oid for the eContentInfo. */ oid = pkinit_pkcs7type2oid(plg_cryptoctx, cms_msg_type); if (oid == NULL) goto cleanup; retval = create_contentinfo(context, oid, data, data_len, &p7); if (retval != 0) goto cleanup; *out_data_len = i2d_PKCS7(p7, NULL); if (!(*out_data_len)) { retval = oerr(context, 0, _("Failed to DER encode PKCS7")); goto cleanup; } retval = ENOMEM; if ((p = *out_data = malloc(*out_data_len)) == NULL) goto cleanup; /* DER encode PKCS7 data */ retval = i2d_PKCS7(p7, &p); if (!retval) { retval = oerr(context, 0, _("Failed to DER encode PKCS7")); goto cleanup; } retval = 0; cleanup: if (p7) PKCS7_free(p7); return retval; } krb5_error_code cms_signeddata_create(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, int cms_msg_type, int include_certchain, unsigned char *data, unsigned int data_len, unsigned char **signed_data, unsigned int *signed_data_len) { krb5_error_code retval = ENOMEM; PKCS7 *p7 = NULL, *inner_p7 = NULL; PKCS7_SIGNED *p7s = NULL; PKCS7_SIGNER_INFO *p7si = NULL; unsigned char *p; STACK_OF(X509) * cert_stack = NULL; ASN1_OCTET_STRING *digest_attr = NULL; EVP_MD_CTX *ctx; const EVP_MD *md_tmp = NULL; unsigned char md_data[EVP_MAX_MD_SIZE], md_data2[EVP_MAX_MD_SIZE]; unsigned char *digestInfo_buf = NULL, *abuf = NULL; unsigned int md_len, md_len2, alen, digestInfo_len; STACK_OF(X509_ATTRIBUTE) * sk; unsigned char *sig = NULL; unsigned int sig_len = 0; X509_ALGOR *alg = NULL; ASN1_OCTET_STRING *digest = NULL; unsigned int alg_len = 0, digest_len = 0; unsigned char *y = NULL; X509 *cert = NULL; ASN1_OBJECT *oid = NULL, *oid_copy; /* Start creating PKCS7 data. */ if ((p7 = PKCS7_new()) == NULL) goto cleanup; p7->type = OBJ_nid2obj(NID_pkcs7_signed); if ((p7s = PKCS7_SIGNED_new()) == NULL) goto cleanup; p7->d.sign = p7s; if (!ASN1_INTEGER_set(p7s->version, 3)) goto cleanup; /* pick the correct oid for the eContentInfo */ oid = pkinit_pkcs7type2oid(plg_cryptoctx, cms_msg_type); if (oid == NULL) goto cleanup; if (id_cryptoctx->my_certs != NULL) { /* create a cert chain that has at least the signer's certificate */ if ((cert_stack = sk_X509_new_null()) == NULL) goto cleanup; cert = sk_X509_value(id_cryptoctx->my_certs, id_cryptoctx->cert_index); if (!include_certchain) { pkiDebug("only including signer's certificate\n"); sk_X509_push(cert_stack, X509_dup(cert)); } else { /* create a cert chain */ X509_STORE *certstore = NULL; X509_STORE_CTX *certctx; STACK_OF(X509) *certstack = NULL; char buf[DN_BUF_LEN]; unsigned int i = 0, size = 0; if ((certstore = X509_STORE_new()) == NULL) goto cleanup; pkiDebug("building certificate chain\n"); X509_STORE_set_verify_cb(certstore, openssl_callback); certctx = X509_STORE_CTX_new(); if (certctx == NULL) goto cleanup; X509_STORE_CTX_init(certctx, certstore, cert, id_cryptoctx->intermediateCAs); X509_STORE_CTX_trusted_stack(certctx, id_cryptoctx->trustedCAs); if (!X509_verify_cert(certctx)) { retval = oerr_cert(context, 0, certctx, _("Failed to verify own certificate")); goto cleanup; } certstack = X509_STORE_CTX_get1_chain(certctx); size = sk_X509_num(certstack); for(i = 0; i < size - 1; i++) { X509 *x = sk_X509_value(certstack, i); X509_NAME_oneline(X509_get_subject_name(x), buf, sizeof(buf)); TRACE_PKINIT_CERT_CHAIN_NAME(context, (int)i, buf); sk_X509_push(cert_stack, X509_dup(x)); } X509_STORE_CTX_free(certctx); X509_STORE_free(certstore); sk_X509_pop_free(certstack, X509_free); } p7s->cert = cert_stack; /* fill-in PKCS7_SIGNER_INFO */ if ((p7si = PKCS7_SIGNER_INFO_new()) == NULL) goto cleanup; if (!ASN1_INTEGER_set(p7si->version, 1)) goto cleanup; if (!X509_NAME_set(&p7si->issuer_and_serial->issuer, X509_get_issuer_name(cert))) goto cleanup; /* because ASN1_INTEGER_set is used to set a 'long' we will do * things the ugly way. */ ASN1_INTEGER_free(p7si->issuer_and_serial->serial); if (!(p7si->issuer_and_serial->serial = ASN1_INTEGER_dup(X509_get_serialNumber(cert)))) goto cleanup; /* will not fill-out EVP_PKEY because it's on the smartcard */ /* Set digest algs */ p7si->digest_alg->algorithm = OBJ_nid2obj(NID_sha1); if (p7si->digest_alg->parameter != NULL) ASN1_TYPE_free(p7si->digest_alg->parameter); if ((p7si->digest_alg->parameter = ASN1_TYPE_new()) == NULL) goto cleanup; p7si->digest_alg->parameter->type = V_ASN1_NULL; /* Set sig algs */ if (p7si->digest_enc_alg->parameter != NULL) ASN1_TYPE_free(p7si->digest_enc_alg->parameter); p7si->digest_enc_alg->algorithm = OBJ_nid2obj(NID_sha1WithRSAEncryption); if (!(p7si->digest_enc_alg->parameter = ASN1_TYPE_new())) goto cleanup; p7si->digest_enc_alg->parameter->type = V_ASN1_NULL; /* add signed attributes */ /* compute sha1 digest over the EncapsulatedContentInfo */ ctx = EVP_MD_CTX_new(); if (ctx == NULL) goto cleanup; EVP_DigestInit_ex(ctx, EVP_sha1(), NULL); EVP_DigestUpdate(ctx, data, data_len); md_tmp = EVP_MD_CTX_md(ctx); EVP_DigestFinal_ex(ctx, md_data, &md_len); EVP_MD_CTX_free(ctx); /* create a message digest attr */ digest_attr = ASN1_OCTET_STRING_new(); ASN1_OCTET_STRING_set(digest_attr, md_data, (int)md_len); PKCS7_add_signed_attribute(p7si, NID_pkcs9_messageDigest, V_ASN1_OCTET_STRING, (char *)digest_attr); /* create a content-type attr */ oid_copy = OBJ_dup(oid); if (oid_copy == NULL) goto cleanup2; PKCS7_add_signed_attribute(p7si, NID_pkcs9_contentType, V_ASN1_OBJECT, oid_copy); /* create the signature over signed attributes. get DER encoded value */ /* This is the place where smartcard signature needs to be calculated */ sk = p7si->auth_attr; alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf, ASN1_ITEM_rptr(PKCS7_ATTR_SIGN)); if (abuf == NULL) goto cleanup2; #ifndef WITHOUT_PKCS11 /* Some tokens can only do RSAEncryption without sha1 hash */ /* to compute sha1WithRSAEncryption, encode the algorithm ID for the hash * function and the hash value into an ASN.1 value of type DigestInfo * DigestInfo::=SEQUENCE { * digestAlgorithm AlgorithmIdentifier, * digest OCTET STRING } */ if (id_cryptoctx->pkcs11_method == 1 && id_cryptoctx->mech == CKM_RSA_PKCS) { pkiDebug("mech = CKM_RSA_PKCS\n"); ctx = EVP_MD_CTX_new(); if (ctx == NULL) goto cleanup; EVP_DigestInit_ex(ctx, md_tmp, NULL); EVP_DigestUpdate(ctx, abuf, alen); EVP_DigestFinal_ex(ctx, md_data2, &md_len2); EVP_MD_CTX_free(ctx); alg = X509_ALGOR_new(); if (alg == NULL) goto cleanup2; X509_ALGOR_set0(alg, OBJ_nid2obj(NID_sha1), V_ASN1_NULL, NULL); alg_len = i2d_X509_ALGOR(alg, NULL); digest = ASN1_OCTET_STRING_new(); if (digest == NULL) goto cleanup2; ASN1_OCTET_STRING_set(digest, md_data2, (int)md_len2); digest_len = i2d_ASN1_OCTET_STRING(digest, NULL); digestInfo_len = ASN1_object_size(1, (int)(alg_len + digest_len), V_ASN1_SEQUENCE); y = digestInfo_buf = malloc(digestInfo_len); if (digestInfo_buf == NULL) goto cleanup2; ASN1_put_object(&y, 1, (int)(alg_len + digest_len), V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL); i2d_X509_ALGOR(alg, &y); i2d_ASN1_OCTET_STRING(digest, &y); #ifdef DEBUG_SIG pkiDebug("signing buffer\n"); print_buffer(digestInfo_buf, digestInfo_len); print_buffer_bin(digestInfo_buf, digestInfo_len, "/tmp/pkcs7_tosign"); #endif retval = pkinit_sign_data(context, id_cryptoctx, digestInfo_buf, digestInfo_len, &sig, &sig_len); } else #endif { pkiDebug("mech = %s\n", id_cryptoctx->pkcs11_method == 1 ? "CKM_SHA1_RSA_PKCS" : "FS"); retval = pkinit_sign_data(context, id_cryptoctx, abuf, alen, &sig, &sig_len); } #ifdef DEBUG_SIG print_buffer(sig, sig_len); #endif free(abuf); if (retval) goto cleanup2; /* Add signature */ if (!ASN1_STRING_set(p7si->enc_digest, (unsigned char *) sig, (int)sig_len)) { retval = oerr(context, 0, _("Failed to add digest attribute")); goto cleanup2; } /* adder signer_info to pkcs7 signed */ if (!PKCS7_add_signer(p7, p7si)) goto cleanup2; } /* we have a certificate */ /* start on adding data to the pkcs7 signed */ retval = create_contentinfo(context, oid, data, data_len, &inner_p7); if (p7s->contents != NULL) PKCS7_free(p7s->contents); p7s->contents = inner_p7; *signed_data_len = i2d_PKCS7(p7, NULL); if (!(*signed_data_len)) { retval = oerr(context, 0, _("Failed to DER encode PKCS7")); goto cleanup2; } retval = ENOMEM; if ((p = *signed_data = malloc(*signed_data_len)) == NULL) goto cleanup2; /* DER encode PKCS7 data */ retval = i2d_PKCS7(p7, &p); if (!retval) { retval = oerr(context, 0, _("Failed to DER encode PKCS7")); goto cleanup2; } retval = 0; #ifdef DEBUG_ASN1 if (cms_msg_type == CMS_SIGN_CLIENT) { print_buffer_bin(*signed_data, *signed_data_len, "/tmp/client_pkcs7_signeddata"); } else { print_buffer_bin(*signed_data, *signed_data_len, "/tmp/kdc_pkcs7_signeddata"); } #endif cleanup2: if (p7si) { #ifndef WITHOUT_PKCS11 if (id_cryptoctx->pkcs11_method == 1 && id_cryptoctx->mech == CKM_RSA_PKCS) { free(digestInfo_buf); if (digest != NULL) ASN1_OCTET_STRING_free(digest); } #endif if (alg != NULL) X509_ALGOR_free(alg); } cleanup: if (p7 != NULL) PKCS7_free(p7); free(sig); return retval; } krb5_error_code cms_signeddata_verify(krb5_context context, pkinit_plg_crypto_context plgctx, pkinit_req_crypto_context reqctx, pkinit_identity_crypto_context idctx, int cms_msg_type, int require_crl_checking, unsigned char *signed_data, unsigned int signed_data_len, unsigned char **data, unsigned int *data_len, unsigned char **authz_data, unsigned int *authz_data_len, int *is_signed) { /* * Warning: Since most openssl functions do not set retval, large chunks of * this function assume that retval is always a failure and may go to * cleanup without setting retval explicitly. Make sure retval is not set * to 0 or errors such as signature verification failure may be converted * to success with significant security consequences. */ krb5_error_code retval = KRB5KDC_ERR_PREAUTH_FAILED; CMS_ContentInfo *cms = NULL; BIO *out = NULL; int flags = CMS_NO_SIGNER_CERT_VERIFY; int valid_oid = 0; unsigned int i = 0; unsigned int vflags = 0, size = 0; const unsigned char *p = signed_data; STACK_OF(CMS_SignerInfo) *si_sk = NULL; CMS_SignerInfo *si = NULL; X509 *x = NULL; X509_STORE *store = NULL; X509_STORE_CTX *cert_ctx; STACK_OF(X509) *signerCerts = NULL; STACK_OF(X509) *intermediateCAs = NULL; STACK_OF(X509_CRL) *signerRevoked = NULL; STACK_OF(X509_CRL) *revoked = NULL; STACK_OF(X509) *verified_chain = NULL; ASN1_OBJECT *oid = NULL; const ASN1_OBJECT *type = NULL, *etype = NULL; ASN1_OCTET_STRING **octets; krb5_external_principal_identifier **krb5_verified_chain = NULL; krb5_data *authz = NULL; char buf[DN_BUF_LEN]; #ifdef DEBUG_ASN1 print_buffer_bin(signed_data, signed_data_len, "/tmp/client_received_pkcs7_signeddata"); #endif if (is_signed) *is_signed = 1; oid = pkinit_pkcs7type2oid(plgctx, cms_msg_type); if (oid == NULL) goto cleanup; /* decode received CMS message */ if ((cms = d2i_CMS_ContentInfo(NULL, &p, (int)signed_data_len)) == NULL) { retval = oerr(context, 0, _("Failed to decode CMS message")); goto cleanup; } etype = CMS_get0_eContentType(cms); /* * Prior to 1.10 the MIT client incorrectly emitted the pkinit structure * directly in a CMS ContentInfo rather than using SignedData with no * signers. Handle that case. */ type = CMS_get0_type(cms); if (is_signed && !OBJ_cmp(type, oid)) { unsigned char *d; *is_signed = 0; octets = pkinit_CMS_get0_content_data(cms); if (!octets || ((*octets)->type != V_ASN1_OCTET_STRING)) { retval = KRB5KDC_ERR_PREAUTH_FAILED; krb5_set_error_message(context, retval, _("Invalid pkinit packet: octet string " "expected")); goto cleanup; } *data_len = ASN1_STRING_length(*octets); d = malloc(*data_len); if (d == NULL) { retval = ENOMEM; goto cleanup; } memcpy(d, ASN1_STRING_get0_data(*octets), *data_len); *data = d; goto out; } else { /* Verify that the received message is CMS SignedData message. */ if (OBJ_obj2nid(type) != NID_pkcs7_signed) { pkiDebug("Expected id-signedData CMS msg (received type = %d)\n", OBJ_obj2nid(type)); krb5_set_error_message(context, retval, _("wrong oid\n")); goto cleanup; } } /* setup to verify X509 certificate used to sign CMS message */ if (!(store = X509_STORE_new())) goto cleanup; /* check if we are inforcing CRL checking */ vflags = X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL; if (require_crl_checking) X509_STORE_set_verify_cb(store, openssl_callback); else X509_STORE_set_verify_cb(store, openssl_callback_ignore_crls); X509_STORE_set_flags(store, vflags); /* * Get the signer's information from the CMS message. Match signer ID * against anchors and intermediate CAs in case no certs are present in the * SignedData. If we start sending kdcPkId values in requests, we'll need * to match against the source of that information too. */ CMS_set1_signers_certs(cms, NULL, 0); CMS_set1_signers_certs(cms, idctx->trustedCAs, CMS_NOINTERN); CMS_set1_signers_certs(cms, idctx->intermediateCAs, CMS_NOINTERN); if (((si_sk = CMS_get0_SignerInfos(cms)) == NULL) || ((si = sk_CMS_SignerInfo_value(si_sk, 0)) == NULL)) { /* Not actually signed; anonymous case */ if (!is_signed) goto cleanup; *is_signed = 0; /* We cannot use CMS_dataInit because there may be no digest */ octets = pkinit_CMS_get0_content_signed(cms); if (octets) out = BIO_new_mem_buf((*octets)->data, (*octets)->length); if (out == NULL) goto cleanup; } else { pkinit_CMS_SignerInfo_get_cert(cms, si, &x); if (x == NULL) goto cleanup; /* create available CRL information (get local CRLs and include CRLs * received in the CMS message */ signerRevoked = CMS_get1_crls(cms); if (idctx->revoked == NULL) revoked = signerRevoked; else if (signerRevoked == NULL) revoked = idctx->revoked; else { size = sk_X509_CRL_num(idctx->revoked); revoked = sk_X509_CRL_new_null(); for (i = 0; i < size; i++) sk_X509_CRL_push(revoked, sk_X509_CRL_value(idctx->revoked, i)); size = sk_X509_CRL_num(signerRevoked); for (i = 0; i < size; i++) sk_X509_CRL_push(revoked, sk_X509_CRL_value(signerRevoked, i)); } /* create available intermediate CAs chains (get local intermediateCAs and * include the CA chain received in the CMS message */ signerCerts = CMS_get1_certs(cms); if (idctx->intermediateCAs == NULL) intermediateCAs = signerCerts; else if (signerCerts == NULL) intermediateCAs = idctx->intermediateCAs; else { size = sk_X509_num(idctx->intermediateCAs); intermediateCAs = sk_X509_new_null(); for (i = 0; i < size; i++) { sk_X509_push(intermediateCAs, sk_X509_value(idctx->intermediateCAs, i)); } size = sk_X509_num(signerCerts); for (i = 0; i < size; i++) { sk_X509_push(intermediateCAs, sk_X509_value(signerCerts, i)); } } /* initialize x509 context with the received certificate and * trusted and intermediate CA chains and CRLs */ cert_ctx = X509_STORE_CTX_new(); if (cert_ctx == NULL) goto cleanup; if (!X509_STORE_CTX_init(cert_ctx, store, x, intermediateCAs)) goto cleanup; X509_STORE_CTX_set0_crls(cert_ctx, revoked); /* add trusted CAs certificates for cert verification */ if (idctx->trustedCAs != NULL) X509_STORE_CTX_trusted_stack(cert_ctx, idctx->trustedCAs); else { pkiDebug("unable to find any trusted CAs\n"); goto cleanup; } #ifdef DEBUG_CERTCHAIN if (intermediateCAs != NULL) { size = sk_X509_num(intermediateCAs); pkiDebug("untrusted cert chain of size %d\n", size); for (i = 0; i < size; i++) { X509_NAME_oneline(X509_get_subject_name( sk_X509_value(intermediateCAs, i)), buf, sizeof(buf)); pkiDebug("cert #%d: %s\n", i, buf); } } if (idctx->trustedCAs != NULL) { size = sk_X509_num(idctx->trustedCAs); pkiDebug("trusted cert chain of size %d\n", size); for (i = 0; i < size; i++) { X509_NAME_oneline(X509_get_subject_name( sk_X509_value(idctx->trustedCAs, i)), buf, sizeof(buf)); pkiDebug("cert #%d: %s\n", i, buf); } } if (revoked != NULL) { size = sk_X509_CRL_num(revoked); pkiDebug("CRL chain of size %d\n", size); for (i = 0; i < size; i++) { X509_CRL *crl = sk_X509_CRL_value(revoked, i); X509_NAME_oneline(X509_CRL_get_issuer(crl), buf, sizeof(buf)); pkiDebug("crls by CA #%d: %s\n", i , buf); } } #endif i = X509_verify_cert(cert_ctx); if (i <= 0) { int j = X509_STORE_CTX_get_error(cert_ctx); X509 *cert; cert = X509_STORE_CTX_get_current_cert(cert_ctx); reqctx->received_cert = X509_dup(cert); switch(j) { case X509_V_ERR_CERT_REVOKED: retval = KRB5KDC_ERR_REVOKED_CERTIFICATE; break; case X509_V_ERR_UNABLE_TO_GET_CRL: retval = KRB5KDC_ERR_REVOCATION_STATUS_UNKNOWN; break; case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: retval = KRB5KDC_ERR_CANT_VERIFY_CERTIFICATE; break; default: retval = KRB5KDC_ERR_INVALID_CERTIFICATE; } (void)oerr_cert(context, retval, cert_ctx, _("Failed to verify received certificate")); if (reqctx->received_cert == NULL) strlcpy(buf, "(none)", sizeof(buf)); else X509_NAME_oneline(X509_get_subject_name(reqctx->received_cert), buf, sizeof(buf)); pkiDebug("problem with cert DN = %s (error=%d) %s\n", buf, j, X509_verify_cert_error_string(j)); #ifdef DEBUG_CERTCHAIN size = sk_X509_num(signerCerts); pkiDebug("received cert chain of size %d\n", size); for (j = 0; j < size; j++) { X509 *tmp_cert = sk_X509_value(signerCerts, j); X509_NAME_oneline(X509_get_subject_name(tmp_cert), buf, sizeof(buf)); pkiDebug("cert #%d: %s\n", j, buf); } #endif } else { /* retrieve verified certificate chain */ if (cms_msg_type == CMS_SIGN_CLIENT) verified_chain = X509_STORE_CTX_get1_chain(cert_ctx); } X509_STORE_CTX_free(cert_ctx); if (i <= 0) goto cleanup; out = BIO_new(BIO_s_mem()); if (CMS_verify(cms, NULL, store, NULL, out, flags) == 0) { unsigned long err = ERR_peek_error(); switch(ERR_GET_REASON(err)) { case PKCS7_R_DIGEST_FAILURE: retval = KRB5KDC_ERR_DIGEST_IN_SIGNED_DATA_NOT_ACCEPTED; break; case PKCS7_R_SIGNATURE_FAILURE: default: retval = KRB5KDC_ERR_INVALID_SIG; } (void)oerr(context, retval, _("Failed to verify CMS message")); goto cleanup; } } /* message was signed */ if (!OBJ_cmp(etype, oid)) valid_oid = 1; if (valid_oid) pkiDebug("CMS Verification successful\n"); else { pkiDebug("wrong oid in eContentType\n"); print_buffer(OBJ_get0_data(etype), OBJ_length(etype)); retval = KRB5KDC_ERR_PREAUTH_FAILED; krb5_set_error_message(context, retval, "wrong oid\n"); goto cleanup; } /* transfer the data from CMS message into return buffer */ for (size = 0;;) { int remain; retval = ENOMEM; if ((*data = realloc(*data, size + 1024 * 10)) == NULL) goto cleanup; remain = BIO_read(out, &((*data)[size]), 1024 * 10); if (remain <= 0) break; else size += remain; } *data_len = size; if (x) { reqctx->received_cert = X509_dup(x); /* generate authorization data */ if (cms_msg_type == CMS_SIGN_CLIENT) { if (authz_data == NULL || authz_data_len == NULL) goto out; *authz_data = NULL; retval = create_identifiers_from_stack(verified_chain, &krb5_verified_chain); if (retval) { pkiDebug("create_identifiers_from_stack failed\n"); goto cleanup; } retval = k5int_encode_krb5_td_trusted_certifiers((krb5_external_principal_identifier *const *)krb5_verified_chain, &authz); if (retval) { pkiDebug("encode_krb5_td_trusted_certifiers failed\n"); goto cleanup; } #ifdef DEBUG_ASN1 print_buffer_bin((unsigned char *)authz->data, authz->length, "/tmp/kdc_ad_initial_verified_cas"); #endif *authz_data = malloc(authz->length); if (*authz_data == NULL) { retval = ENOMEM; goto cleanup; } memcpy(*authz_data, authz->data, authz->length); *authz_data_len = authz->length; } } out: retval = 0; cleanup: if (out != NULL) BIO_free(out); if (store != NULL) X509_STORE_free(store); if (cms != NULL) { if (signerCerts != NULL) pkinit_CMS_free1_certs(signerCerts); if (idctx->intermediateCAs != NULL && signerCerts) sk_X509_free(intermediateCAs); if (signerRevoked != NULL) pkinit_CMS_free1_crls(signerRevoked); if (idctx->revoked != NULL && signerRevoked) sk_X509_CRL_free(revoked); CMS_ContentInfo_free(cms); } if (verified_chain != NULL) sk_X509_pop_free(verified_chain, X509_free); if (krb5_verified_chain != NULL) free_krb5_external_principal_identifier(&krb5_verified_chain); if (authz != NULL) krb5_free_data(context, authz); return retval; } krb5_error_code cms_envelopeddata_create(krb5_context context, pkinit_plg_crypto_context plgctx, pkinit_req_crypto_context reqctx, pkinit_identity_crypto_context idctx, krb5_preauthtype pa_type, int include_certchain, unsigned char *key_pack, unsigned int key_pack_len, unsigned char **out, unsigned int *out_len) { krb5_error_code retval = ENOMEM; PKCS7 *p7 = NULL; BIO *in = NULL; unsigned char *p = NULL, *signed_data = NULL, *enc_data = NULL; int signed_data_len = 0, enc_data_len = 0, flags = PKCS7_BINARY; STACK_OF(X509) *encerts = NULL; const EVP_CIPHER *cipher = NULL; retval = cms_signeddata_create(context, plgctx, reqctx, idctx, CMS_ENVEL_SERVER, include_certchain, key_pack, key_pack_len, &signed_data, (unsigned int *)&signed_data_len); if (retval) { pkiDebug("failed to create pkcs7 signed data\n"); goto cleanup; } /* check we have client's certificate */ if (reqctx->received_cert == NULL) { retval = KRB5KDC_ERR_PREAUTH_FAILED; goto cleanup; } encerts = sk_X509_new_null(); sk_X509_push(encerts, reqctx->received_cert); cipher = EVP_des_ede3_cbc(); in = BIO_new(BIO_s_mem()); prepare_enc_data(signed_data, signed_data_len, &enc_data, &enc_data_len); retval = BIO_write(in, enc_data, enc_data_len); if (retval != enc_data_len) { pkiDebug("BIO_write only wrote %d\n", retval); goto cleanup; } p7 = PKCS7_encrypt(encerts, in, cipher, flags); if (p7 == NULL) { retval = oerr(context, 0, _("Failed to encrypt PKCS7 object")); goto cleanup; } p7->d.enveloped->enc_data->content_type = OBJ_nid2obj(NID_pkcs7_signed); *out_len = i2d_PKCS7(p7, NULL); if (!*out_len || (p = *out = malloc(*out_len)) == NULL) { retval = ENOMEM; goto cleanup; } retval = i2d_PKCS7(p7, &p); if (!retval) { retval = oerr(context, 0, _("Failed to DER encode PKCS7")); goto cleanup; } retval = 0; #ifdef DEBUG_ASN1 print_buffer_bin(*out, *out_len, "/tmp/kdc_enveloped_data"); #endif cleanup: if (p7 != NULL) PKCS7_free(p7); if (in != NULL) BIO_free(in); free(signed_data); free(enc_data); if (encerts != NULL) sk_X509_free(encerts); return retval; } krb5_error_code cms_envelopeddata_verify(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, krb5_preauthtype pa_type, int require_crl_checking, unsigned char *enveloped_data, unsigned int enveloped_data_len, unsigned char **data, unsigned int *data_len) { krb5_error_code retval = KRB5KDC_ERR_PREAUTH_FAILED; PKCS7 *p7 = NULL; const unsigned char *p = enveloped_data; unsigned int tmp_buf_len = 0, tmp_buf2_len = 0, vfy_buf_len = 0; unsigned char *tmp_buf = NULL, *tmp_buf2 = NULL, *vfy_buf = NULL; #ifdef DEBUG_ASN1 print_buffer_bin(enveloped_data, enveloped_data_len, "/tmp/client_envelopeddata"); #endif /* decode received PKCS7 message */ if ((p7 = d2i_PKCS7(NULL, &p, (int)enveloped_data_len)) == NULL) { retval = oerr(context, 0, _("Failed to decode PKCS7")); goto cleanup; } /* verify that the received message is PKCS7 EnvelopedData message */ if (OBJ_obj2nid(p7->type) != NID_pkcs7_enveloped) { pkiDebug("Expected id-enveloped PKCS7 msg (received type = %d)\n", OBJ_obj2nid(p7->type)); krb5_set_error_message(context, retval, "wrong oid\n"); goto cleanup; } /* decrypt received PKCS7 message */ if (pkcs7_decrypt(context, id_cryptoctx, p7, &tmp_buf, &tmp_buf_len)) { pkiDebug("PKCS7 decryption successful\n"); } else { retval = oerr(context, 0, _("Failed to decrypt PKCS7 message")); goto cleanup; } #ifdef DEBUG_ASN1 print_buffer_bin(tmp_buf, tmp_buf_len, "/tmp/client_enc_keypack"); #endif /* verify PKCS7 SignedData message */ /* Wrap the signed data to make decoding easier in the verify routine. */ retval = wrap_signeddata(tmp_buf, tmp_buf_len, &tmp_buf2, &tmp_buf2_len); if (retval) { pkiDebug("failed to encode signeddata\n"); goto cleanup; } vfy_buf = tmp_buf2; vfy_buf_len = tmp_buf2_len; #ifdef DEBUG_ASN1 print_buffer_bin(vfy_buf, vfy_buf_len, "/tmp/client_enc_keypack2"); #endif retval = cms_signeddata_verify(context, plg_cryptoctx, req_cryptoctx, id_cryptoctx, CMS_ENVEL_SERVER, require_crl_checking, vfy_buf, vfy_buf_len, data, data_len, NULL, NULL, NULL); if (!retval) pkiDebug("PKCS7 Verification Success\n"); else { pkiDebug("PKCS7 Verification Failure\n"); goto cleanup; } retval = 0; cleanup: if (p7 != NULL) PKCS7_free(p7); free(tmp_buf); free(tmp_buf2); return retval; } static krb5_error_code crypto_retrieve_X509_sans(krb5_context context, pkinit_plg_crypto_context plgctx, pkinit_req_crypto_context reqctx, X509 *cert, krb5_principal **princs_ret, char ***upn_ret, unsigned char ***dns_ret) { krb5_error_code retval = EINVAL; char buf[DN_BUF_LEN]; int p = 0, u = 0, d = 0, ret = 0, l; krb5_principal *princs = NULL; char **upns = NULL; unsigned char **dnss = NULL; unsigned int i, num_sans = 0; X509_EXTENSION *ext = NULL; GENERAL_NAMES *ialt = NULL; GENERAL_NAME *gen = NULL; if (princs_ret != NULL) *princs_ret = NULL; if (upn_ret != NULL) *upn_ret = NULL; if (dns_ret != NULL) *dns_ret = NULL; if (princs_ret == NULL && upn_ret == NULL && dns_ret == NULL) { pkiDebug("%s: nowhere to return any values!\n", __FUNCTION__); return retval; } if (cert == NULL) { pkiDebug("%s: no certificate!\n", __FUNCTION__); return retval; } X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof(buf)); l = X509_get_ext_by_NID(cert, NID_subject_alt_name, -1); if (l < 0) return 0; if (!(ext = X509_get_ext(cert, l)) || !(ialt = X509V3_EXT_d2i(ext))) { TRACE_PKINIT_SAN_CERT_NONE(context, buf); goto cleanup; } num_sans = sk_GENERAL_NAME_num(ialt); /* OK, we're likely returning something. Allocate return values */ if (princs_ret != NULL) { princs = calloc(num_sans + 1, sizeof(krb5_principal)); if (princs == NULL) { retval = ENOMEM; goto cleanup; } } if (upn_ret != NULL) { upns = calloc(num_sans + 1, sizeof(*upns)); if (upns == NULL) { retval = ENOMEM; goto cleanup; } } if (dns_ret != NULL) { dnss = calloc(num_sans + 1, sizeof(*dnss)); if (dnss == NULL) { retval = ENOMEM; goto cleanup; } } for (i = 0; i < num_sans; i++) { krb5_data name = { 0, 0, NULL }; gen = sk_GENERAL_NAME_value(ialt, i); switch (gen->type) { case GEN_OTHERNAME: name.length = gen->d.otherName->value->value.sequence->length; name.data = (char *)gen->d.otherName->value->value.sequence->data; if (princs != NULL && OBJ_cmp(plgctx->id_pkinit_san, gen->d.otherName->type_id) == 0) { #ifdef DEBUG_ASN1 print_buffer_bin((unsigned char *)name.data, name.length, "/tmp/pkinit_san"); #endif ret = k5int_decode_krb5_principal_name(&name, &princs[p]); if (ret) { pkiDebug("%s: failed decoding pkinit san value\n", __FUNCTION__); } else { p++; } } else if (upns != NULL && OBJ_cmp(plgctx->id_ms_san_upn, gen->d.otherName->type_id) == 0) { /* Prevent abuse of embedded null characters. */ if (memchr(name.data, '\0', name.length)) break; upns[u] = k5memdup0(name.data, name.length, &ret); if (upns[u] == NULL) goto cleanup; u++; } else { pkiDebug("%s: unrecognized othername oid in SAN\n", __FUNCTION__); continue; } break; case GEN_DNS: if (dnss != NULL) { /* Prevent abuse of embedded null characters. */ if (memchr(gen->d.dNSName->data, '\0', gen->d.dNSName->length)) break; pkiDebug("%s: found dns name = %s\n", __FUNCTION__, gen->d.dNSName->data); dnss[d] = (unsigned char *) strdup((char *)gen->d.dNSName->data); if (dnss[d] == NULL) { pkiDebug("%s: failed to duplicate dns name\n", __FUNCTION__); } else { d++; } } break; default: pkiDebug("%s: SAN type = %d expecting %d\n", __FUNCTION__, gen->type, GEN_OTHERNAME); } } sk_GENERAL_NAME_pop_free(ialt, GENERAL_NAME_free); TRACE_PKINIT_SAN_CERT_COUNT(context, (int)num_sans, p, u, d, buf); retval = 0; if (princs != NULL && *princs != NULL) { *princs_ret = princs; princs = NULL; } if (upns != NULL && *upns != NULL) { *upn_ret = upns; upns = NULL; } if (dnss != NULL && *dnss != NULL) { *dns_ret = dnss; dnss = NULL; } cleanup: for (i = 0; princs != NULL && princs[i] != NULL; i++) krb5_free_principal(context, princs[i]); free(princs); for (i = 0; upns != NULL && upns[i] != NULL; i++) free(upns[i]); free(upns); for (i = 0; dnss != NULL && dnss[i] != NULL; i++) free(dnss[i]); free(dnss); return retval; } krb5_error_code crypto_retrieve_signer_identity(krb5_context context, pkinit_identity_crypto_context id_cryptoctx, const char **identity) { *identity = id_cryptoctx->identity; if (*identity == NULL) return ENOENT; return 0; } krb5_error_code crypto_retrieve_cert_sans(krb5_context context, pkinit_plg_crypto_context plgctx, pkinit_req_crypto_context reqctx, pkinit_identity_crypto_context idctx, krb5_principal **princs_ret, char ***upn_ret, unsigned char ***dns_ret) { krb5_error_code retval = EINVAL; if (reqctx->received_cert == NULL) { pkiDebug("%s: No certificate!\n", __FUNCTION__); return retval; } return crypto_retrieve_X509_sans(context, plgctx, reqctx, reqctx->received_cert, princs_ret, upn_ret, dns_ret); } krb5_error_code crypto_check_cert_eku(krb5_context context, pkinit_plg_crypto_context plgctx, pkinit_req_crypto_context reqctx, pkinit_identity_crypto_context idctx, int checking_kdc_cert, int allow_secondary_usage, int *valid_eku) { char buf[DN_BUF_LEN]; int found_eku = 0; krb5_error_code retval = EINVAL; int i; *valid_eku = 0; if (reqctx->received_cert == NULL) goto cleanup; X509_NAME_oneline(X509_get_subject_name(reqctx->received_cert), buf, sizeof(buf)); if ((i = X509_get_ext_by_NID(reqctx->received_cert, NID_ext_key_usage, -1)) >= 0) { EXTENDED_KEY_USAGE *extusage; extusage = X509_get_ext_d2i(reqctx->received_cert, NID_ext_key_usage, NULL, NULL); if (extusage) { pkiDebug("%s: found eku info in the cert\n", __FUNCTION__); for (i = 0; found_eku == 0 && i < sk_ASN1_OBJECT_num(extusage); i++) { ASN1_OBJECT *tmp_oid; tmp_oid = sk_ASN1_OBJECT_value(extusage, i); pkiDebug("%s: checking eku %d of %d, allow_secondary = %d\n", __FUNCTION__, i+1, sk_ASN1_OBJECT_num(extusage), allow_secondary_usage); if (checking_kdc_cert) { if ((OBJ_cmp(tmp_oid, plgctx->id_pkinit_KPKdc) == 0) || (allow_secondary_usage && OBJ_cmp(tmp_oid, plgctx->id_kp_serverAuth) == 0)) found_eku = 1; } else { if ((OBJ_cmp(tmp_oid, plgctx->id_pkinit_KPClientAuth) == 0) || (allow_secondary_usage && OBJ_cmp(tmp_oid, plgctx->id_ms_kp_sc_logon) == 0)) found_eku = 1; } } } EXTENDED_KEY_USAGE_free(extusage); if (found_eku) { ASN1_BIT_STRING *usage = NULL; /* check that digitalSignature KeyUsage is present */ X509_check_ca(reqctx->received_cert); if ((usage = X509_get_ext_d2i(reqctx->received_cert, NID_key_usage, NULL, NULL))) { if (!ku_reject(reqctx->received_cert, X509v3_KU_DIGITAL_SIGNATURE)) { TRACE_PKINIT_EKU(context); *valid_eku = 1; } else TRACE_PKINIT_EKU_NO_KU(context); } ASN1_BIT_STRING_free(usage); } } retval = 0; cleanup: pkiDebug("%s: returning retval %d, valid_eku %d\n", __FUNCTION__, retval, *valid_eku); return retval; } krb5_error_code pkinit_octetstring2key(krb5_context context, krb5_enctype etype, unsigned char *key, unsigned int dh_key_len, krb5_keyblock *key_block) { krb5_error_code retval; unsigned char *buf = NULL; unsigned char md[SHA_DIGEST_LENGTH]; unsigned char counter; size_t keybytes, keylength, offset; krb5_data random_data; if ((buf = malloc(dh_key_len)) == NULL) { retval = ENOMEM; goto cleanup; } memset(buf, 0, dh_key_len); counter = 0; offset = 0; do { SHA_CTX c; SHA1_Init(&c); SHA1_Update(&c, &counter, 1); SHA1_Update(&c, key, dh_key_len); SHA1_Final(md, &c); if (dh_key_len - offset < sizeof(md)) memcpy(buf + offset, md, dh_key_len - offset); else memcpy(buf + offset, md, sizeof(md)); offset += sizeof(md); counter++; } while (offset < dh_key_len); key_block->magic = 0; key_block->enctype = etype; retval = krb5_c_keylengths(context, etype, &keybytes, &keylength); if (retval) goto cleanup; key_block->length = keylength; key_block->contents = malloc(keylength); if (key_block->contents == NULL) { retval = ENOMEM; goto cleanup; } random_data.length = keybytes; random_data.data = (char *)buf; retval = krb5_c_random_to_key(context, etype, &random_data, key_block); cleanup: free(buf); /* If this is an error return, free the allocated keyblock, if any */ if (retval) { krb5_free_keyblock_contents(context, key_block); } return retval; } /** * Given an algorithm_identifier, this function returns the hash length * and EVP function associated with that algorithm. */ static krb5_error_code pkinit_alg_values(krb5_context context, const krb5_data *alg_id, size_t *hash_bytes, const EVP_MD *(**func)(void)) { *hash_bytes = 0; *func = NULL; if ((alg_id->length == krb5_pkinit_sha1_oid_len) && (0 == memcmp(alg_id->data, &krb5_pkinit_sha1_oid, krb5_pkinit_sha1_oid_len))) { *hash_bytes = 20; *func = &EVP_sha1; return 0; } else if ((alg_id->length == krb5_pkinit_sha256_oid_len) && (0 == memcmp(alg_id->data, krb5_pkinit_sha256_oid, krb5_pkinit_sha256_oid_len))) { *hash_bytes = 32; *func = &EVP_sha256; return 0; } else if ((alg_id->length == krb5_pkinit_sha512_oid_len) && (0 == memcmp(alg_id->data, krb5_pkinit_sha512_oid, krb5_pkinit_sha512_oid_len))) { *hash_bytes = 64; *func = &EVP_sha512; return 0; } else { krb5_set_error_message(context, KRB5_ERR_BAD_S2K_PARAMS, "Bad algorithm ID passed to PK-INIT KDF."); return KRB5_ERR_BAD_S2K_PARAMS; } } /* pkinit_alg_values() */ /* pkinit_alg_agility_kdf() -- * This function generates a key using the KDF described in * draft_ietf_krb_wg_pkinit_alg_agility-04.txt. The algorithm is * described as follows: * * 1. reps = keydatalen (K) / hash length (H) * * 2. Initialize a 32-bit, big-endian bit string counter as 1. * * 3. For i = 1 to reps by 1, do the following: * * - Compute Hashi = H(counter || Z || OtherInfo). * * - Increment counter (modulo 2^32) * * 4. Set key = Hash1 || Hash2 || ... so that length of key is K bytes. */ krb5_error_code pkinit_alg_agility_kdf(krb5_context context, krb5_data *secret, krb5_data *alg_oid, krb5_const_principal party_u_info, krb5_const_principal party_v_info, krb5_enctype enctype, krb5_data *as_req, krb5_data *pk_as_rep, krb5_keyblock *key_block) { krb5_error_code retval = 0; unsigned int reps = 0; uint32_t counter = 1; /* Does this type work on Windows? */ size_t offset = 0; size_t hash_len = 0; size_t rand_len = 0; size_t key_len = 0; krb5_data random_data; krb5_sp80056a_other_info other_info_fields; krb5_pkinit_supp_pub_info supp_pub_info_fields; krb5_data *other_info = NULL; krb5_data *supp_pub_info = NULL; krb5_algorithm_identifier alg_id; EVP_MD_CTX *ctx = NULL; const EVP_MD *(*EVP_func)(void); /* initialize random_data here to make clean-up safe */ random_data.length = 0; random_data.data = NULL; /* allocate and initialize the key block */ key_block->magic = 0; key_block->enctype = enctype; if (0 != (retval = krb5_c_keylengths(context, enctype, &rand_len, &key_len))) goto cleanup; random_data.length = rand_len; key_block->length = key_len; if (NULL == (key_block->contents = malloc(key_block->length))) { retval = ENOMEM; goto cleanup; } memset (key_block->contents, 0, key_block->length); /* If this is anonymous pkinit, use the anonymous principle for party_u_info */ if (party_u_info && krb5_principal_compare_any_realm(context, party_u_info, krb5_anonymous_principal())) party_u_info = (krb5_principal)krb5_anonymous_principal(); if (0 != (retval = pkinit_alg_values(context, alg_oid, &hash_len, &EVP_func))) goto cleanup; /* 1. reps = keydatalen (K) / hash length (H) */ reps = key_block->length/hash_len; /* ... and round up, if necessary */ if (key_block->length > (reps * hash_len)) reps++; /* Allocate enough space in the random data buffer to hash directly into * it, even if the last hash will make it bigger than the key length. */ if (NULL == (random_data.data = malloc(reps * hash_len))) { retval = ENOMEM; goto cleanup; } /* Encode the ASN.1 octet string for "SuppPubInfo" */ supp_pub_info_fields.enctype = enctype; supp_pub_info_fields.as_req = *as_req; supp_pub_info_fields.pk_as_rep = *pk_as_rep; if (0 != ((retval = encode_krb5_pkinit_supp_pub_info(&supp_pub_info_fields, &supp_pub_info)))) goto cleanup; /* Now encode the ASN.1 octet string for "OtherInfo" */ memset(&alg_id, 0, sizeof alg_id); alg_id.algorithm = *alg_oid; /*alias*/ other_info_fields.algorithm_identifier = alg_id; other_info_fields.party_u_info = (krb5_principal) party_u_info; other_info_fields.party_v_info = (krb5_principal) party_v_info; other_info_fields.supp_pub_info = *supp_pub_info; if (0 != (retval = encode_krb5_sp80056a_other_info(&other_info_fields, &other_info))) goto cleanup; /* 2. Initialize a 32-bit, big-endian bit string counter as 1. * 3. For i = 1 to reps by 1, do the following: * - Compute Hashi = H(counter || Z || OtherInfo). * - Increment counter (modulo 2^32) */ for (counter = 1; counter <= reps; counter++) { uint s = 0; uint32_t be_counter = htonl(counter); ctx = EVP_MD_CTX_new(); if (ctx == NULL) { retval = KRB5_CRYPTO_INTERNAL; goto cleanup; } /* - Compute Hashi = H(counter || Z || OtherInfo). */ if (!EVP_DigestInit(ctx, EVP_func())) { krb5_set_error_message(context, KRB5_CRYPTO_INTERNAL, "Call to OpenSSL EVP_DigestInit() returned an error."); retval = KRB5_CRYPTO_INTERNAL; goto cleanup; } if (!EVP_DigestUpdate(ctx, &be_counter, 4) || !EVP_DigestUpdate(ctx, secret->data, secret->length) || !EVP_DigestUpdate(ctx, other_info->data, other_info->length)) { krb5_set_error_message(context, KRB5_CRYPTO_INTERNAL, "Call to OpenSSL EVP_DigestUpdate() returned an error."); retval = KRB5_CRYPTO_INTERNAL; goto cleanup; } /* 4. Set key = Hash1 || Hash2 || ... so that length of key is K bytes. */ if (!EVP_DigestFinal(ctx, (uint8_t *)random_data.data + offset, &s)) { krb5_set_error_message(context, KRB5_CRYPTO_INTERNAL, "Call to OpenSSL EVP_DigestUpdate() returned an error."); retval = KRB5_CRYPTO_INTERNAL; goto cleanup; } offset += s; assert(s == hash_len); EVP_MD_CTX_free(ctx); ctx = NULL; } retval = krb5_c_random_to_key(context, enctype, &random_data, key_block); cleanup: EVP_MD_CTX_free(ctx); /* If this has been an error, free the allocated key_block, if any */ if (retval) { krb5_free_keyblock_contents(context, key_block); } /* free other allocated resources, either way */ if (random_data.data) free(random_data.data); krb5_free_data(context, other_info); krb5_free_data(context, supp_pub_info); return retval; } /*pkinit_alg_agility_kdf() */ /* Call DH_compute_key() and ensure that we left-pad short results instead of * leaving junk bytes at the end of the buffer. */ static void compute_dh(unsigned char *buf, int size, BIGNUM *server_pub_key, DH *dh) { int len, pad; len = DH_compute_key(buf, server_pub_key, dh); assert(len >= 0 && len <= size); if (len < size) { pad = size - len; memmove(buf + pad, buf, len); memset(buf, 0, pad); } } krb5_error_code client_create_dh(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context cryptoctx, pkinit_identity_crypto_context id_cryptoctx, int dh_size, unsigned char **dh_params_out, unsigned int *dh_params_len_out, unsigned char **dh_pubkey_out, unsigned int *dh_pubkey_len_out) { krb5_error_code retval = KRB5KDC_ERR_PREAUTH_FAILED; unsigned char *buf = NULL; int dh_err = 0; ASN1_INTEGER *pub_key = NULL; const BIGNUM *pubkey_bn, *p, *q, *g; unsigned char *dh_params = NULL, *dh_pubkey = NULL; unsigned int dh_params_len, dh_pubkey_len; *dh_params_out = *dh_pubkey_out = NULL; *dh_params_len_out = *dh_pubkey_len_out = 0; if (cryptoctx->dh == NULL) { if (dh_size == 1024) cryptoctx->dh = make_oakley_dh(oakley_1024, sizeof(oakley_1024)); else if (dh_size == 2048) cryptoctx->dh = make_oakley_dh(oakley_2048, sizeof(oakley_2048)); else if (dh_size == 4096) cryptoctx->dh = make_oakley_dh(oakley_4096, sizeof(oakley_4096)); if (cryptoctx->dh == NULL) goto cleanup; } DH_generate_key(cryptoctx->dh); DH_get0_key(cryptoctx->dh, &pubkey_bn, NULL); DH_check(cryptoctx->dh, &dh_err); if (dh_err != 0) { pkiDebug("Warning: dh_check failed with %d\n", dh_err); if (dh_err & DH_CHECK_P_NOT_PRIME) pkiDebug("p value is not prime\n"); if (dh_err & DH_CHECK_P_NOT_SAFE_PRIME) pkiDebug("p value is not a safe prime\n"); if (dh_err & DH_UNABLE_TO_CHECK_GENERATOR) pkiDebug("unable to check the generator value\n"); if (dh_err & DH_NOT_SUITABLE_GENERATOR) pkiDebug("the g value is not a generator\n"); } #ifdef DEBUG_DH print_dh(cryptoctx->dh, "client's DH params\n"); print_pubkey(cryptoctx->dh->pub_key, "client's pub_key="); #endif DH_check_pub_key(cryptoctx->dh, pubkey_bn, &dh_err); if (dh_err != 0) { pkiDebug("dh_check_pub_key failed with %d\n", dh_err); goto cleanup; } /* pack DHparams */ /* aglo: usually we could just call i2d_DHparams to encode DH params * however, PKINIT requires RFC3279 encoding and openssl does pkcs#3. */ DH_get0_pqg(cryptoctx->dh, &p, &q, &g); retval = pkinit_encode_dh_params(p, g, q, &dh_params, &dh_params_len); if (retval) goto cleanup; /* pack DH public key */ /* Diffie-Hellman public key must be ASN1 encoded as an INTEGER; this * encoding shall be used as the contents (the value) of the * subjectPublicKey component (a BIT STRING) of the SubjectPublicKeyInfo * data element */ pub_key = BN_to_ASN1_INTEGER(pubkey_bn, NULL); if (pub_key == NULL) { retval = ENOMEM; goto cleanup; } dh_pubkey_len = i2d_ASN1_INTEGER(pub_key, NULL); buf = dh_pubkey = malloc(dh_pubkey_len); if (dh_pubkey == NULL) { retval = ENOMEM; goto cleanup; } i2d_ASN1_INTEGER(pub_key, &buf); *dh_params_out = dh_params; *dh_params_len_out = dh_params_len; *dh_pubkey_out = dh_pubkey; *dh_pubkey_len_out = dh_pubkey_len; dh_params = dh_pubkey = NULL; retval = 0; cleanup: if (retval) { DH_free(cryptoctx->dh); cryptoctx->dh = NULL; } free(dh_params); free(dh_pubkey); ASN1_INTEGER_free(pub_key); return retval; } krb5_error_code client_process_dh(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context cryptoctx, pkinit_identity_crypto_context id_cryptoctx, unsigned char *subjectPublicKey_data, unsigned int subjectPublicKey_length, unsigned char **client_key_out, unsigned int *client_key_len_out) { krb5_error_code retval = KRB5KDC_ERR_PREAUTH_FAILED; BIGNUM *server_pub_key = NULL; ASN1_INTEGER *pub_key = NULL; unsigned char *client_key = NULL; unsigned int client_key_len; const unsigned char *p = NULL; *client_key_out = NULL; *client_key_len_out = 0; client_key_len = DH_size(cryptoctx->dh); client_key = malloc(client_key_len); if (client_key == NULL) { retval = ENOMEM; goto cleanup; } p = subjectPublicKey_data; pub_key = d2i_ASN1_INTEGER(NULL, &p, (long)subjectPublicKey_length); if (pub_key == NULL) goto cleanup; if ((server_pub_key = ASN1_INTEGER_to_BN(pub_key, NULL)) == NULL) goto cleanup; compute_dh(client_key, client_key_len, server_pub_key, cryptoctx->dh); #ifdef DEBUG_DH print_pubkey(server_pub_key, "server's pub_key="); pkiDebug("client computed key (%d)= ", client_key_len); print_buffer(client_key, client_key_len); #endif *client_key_out = client_key; *client_key_len_out = client_key_len; client_key = NULL; retval = 0; cleanup: BN_free(server_pub_key); ASN1_INTEGER_free(pub_key); free(client_key); return retval; } /* Return 1 if dh is a permitted well-known group, otherwise return 0. */ static int check_dh_wellknown(pkinit_plg_crypto_context cryptoctx, DH *dh, int nbits) { switch (nbits) { case 1024: /* Oakley MODP group 2 */ if (pkinit_check_dh_params(cryptoctx->dh_1024, dh) == 0) return 1; break; case 2048: /* Oakley MODP group 14 */ if (pkinit_check_dh_params(cryptoctx->dh_2048, dh) == 0) return 1; break; case 4096: /* Oakley MODP group 16 */ if (pkinit_check_dh_params(cryptoctx->dh_4096, dh) == 0) return 1; break; default: break; } return 0; } krb5_error_code server_check_dh(krb5_context context, pkinit_plg_crypto_context cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, krb5_data *dh_params, int minbits) { DH *dh = NULL; const BIGNUM *p; int dh_prime_bits; krb5_error_code retval = KRB5KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED; dh = decode_dh_params((uint8_t *)dh_params->data, dh_params->length); if (dh == NULL) { pkiDebug("failed to decode dhparams\n"); goto cleanup; } /* KDC SHOULD check to see if the key parameters satisfy its policy */ DH_get0_pqg(dh, &p, NULL, NULL); dh_prime_bits = BN_num_bits(p); if (minbits && dh_prime_bits < minbits) { pkiDebug("client sent dh params with %d bits, we require %d\n", dh_prime_bits, minbits); goto cleanup; } if (check_dh_wellknown(cryptoctx, dh, dh_prime_bits)) retval = 0; cleanup: if (retval == 0) req_cryptoctx->dh = dh; else DH_free(dh); return retval; } /* Duplicate a DH handle (parameters only, not public or private key). */ static DH * dup_dh_params(const DH *src) { const BIGNUM *oldp, *oldq, *oldg; BIGNUM *p = NULL, *q = NULL, *g = NULL; DH *dh; DH_get0_pqg(src, &oldp, &oldq, &oldg); p = BN_dup(oldp); q = BN_dup(oldq); g = BN_dup(oldg); dh = DH_new(); if (p == NULL || q == NULL || g == NULL || dh == NULL) { BN_free(p); BN_free(q); BN_free(g); DH_free(dh); return NULL; } DH_set0_pqg(dh, p, q, g); return dh; } /* kdc's dh function */ krb5_error_code server_process_dh(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context cryptoctx, pkinit_identity_crypto_context id_cryptoctx, unsigned char *data, unsigned int data_len, unsigned char **dh_pubkey_out, unsigned int *dh_pubkey_len_out, unsigned char **server_key_out, unsigned int *server_key_len_out) { krb5_error_code retval = ENOMEM; DH *dh = NULL, *dh_server = NULL; unsigned char *p = NULL; ASN1_INTEGER *pub_key = NULL; BIGNUM *client_pubkey = NULL; const BIGNUM *server_pubkey; unsigned char *dh_pubkey = NULL, *server_key = NULL; unsigned int dh_pubkey_len = 0, server_key_len = 0; *dh_pubkey_out = *server_key_out = NULL; *dh_pubkey_len_out = *server_key_len_out = 0; /* get client's received DH parameters that we saved in server_check_dh */ dh = cryptoctx->dh; dh_server = dup_dh_params(dh); if (dh_server == NULL) goto cleanup; /* decode client's public key */ p = data; pub_key = d2i_ASN1_INTEGER(NULL, (const unsigned char **)&p, (int)data_len); if (pub_key == NULL) goto cleanup; client_pubkey = ASN1_INTEGER_to_BN(pub_key, NULL); if (client_pubkey == NULL) goto cleanup; ASN1_INTEGER_free(pub_key); if (!DH_generate_key(dh_server)) goto cleanup; DH_get0_key(dh_server, &server_pubkey, NULL); /* generate DH session key */ server_key_len = DH_size(dh_server); server_key = malloc(server_key_len); if (server_key == NULL) goto cleanup; compute_dh(server_key, server_key_len, client_pubkey, dh_server); #ifdef DEBUG_DH print_dh(dh_server, "client&server's DH params\n"); print_pubkey(client_pubkey, "client's pub_key="); print_pubkey(server_pubkey, "server's pub_key="); pkiDebug("server computed key="); print_buffer(server_key, server_key_len); #endif /* KDC reply */ /* pack DH public key */ /* Diffie-Hellman public key must be ASN1 encoded as an INTEGER; this * encoding shall be used as the contents (the value) of the * subjectPublicKey component (a BIT STRING) of the SubjectPublicKeyInfo * data element */ pub_key = BN_to_ASN1_INTEGER(server_pubkey, NULL); if (pub_key == NULL) goto cleanup; dh_pubkey_len = i2d_ASN1_INTEGER(pub_key, NULL); p = dh_pubkey = malloc(dh_pubkey_len); if (dh_pubkey == NULL) goto cleanup; i2d_ASN1_INTEGER(pub_key, &p); if (pub_key != NULL) ASN1_INTEGER_free(pub_key); *dh_pubkey_out = dh_pubkey; *dh_pubkey_len_out = dh_pubkey_len; *server_key_out = server_key; *server_key_len_out = server_key_len; dh_pubkey = server_key = NULL; retval = 0; cleanup: BN_free(client_pubkey); DH_free(dh_server); free(dh_pubkey); free(server_key); return retval; } int pkinit_openssl_init() { /* Initialize OpenSSL. */ ERR_load_crypto_strings(); OpenSSL_add_all_algorithms(); return 0; } static krb5_error_code pkinit_encode_dh_params(const BIGNUM *p, const BIGNUM *g, const BIGNUM *q, uint8_t **buf, unsigned int *buf_len) { krb5_error_code retval = ENOMEM; int bufsize = 0, r = 0; unsigned char *tmp = NULL; ASN1_INTEGER *ap = NULL, *ag = NULL, *aq = NULL; if ((ap = BN_to_ASN1_INTEGER(p, NULL)) == NULL) goto cleanup; if ((ag = BN_to_ASN1_INTEGER(g, NULL)) == NULL) goto cleanup; if ((aq = BN_to_ASN1_INTEGER(q, NULL)) == NULL) goto cleanup; bufsize = i2d_ASN1_INTEGER(ap, NULL); bufsize += i2d_ASN1_INTEGER(ag, NULL); bufsize += i2d_ASN1_INTEGER(aq, NULL); r = ASN1_object_size(1, bufsize, V_ASN1_SEQUENCE); tmp = *buf = malloc((size_t) r); if (tmp == NULL) goto cleanup; ASN1_put_object(&tmp, 1, bufsize, V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL); i2d_ASN1_INTEGER(ap, &tmp); i2d_ASN1_INTEGER(ag, &tmp); i2d_ASN1_INTEGER(aq, &tmp); *buf_len = r; retval = 0; cleanup: if (ap != NULL) ASN1_INTEGER_free(ap); if (ag != NULL) ASN1_INTEGER_free(ag); if (aq != NULL) ASN1_INTEGER_free(aq); return retval; } #if OPENSSL_VERSION_NUMBER >= 0x10100000L /* * We need to decode DomainParameters from RFC 3279 section 2.3.3. We would * like to just call d2i_DHxparams(), but Microsoft's implementation may omit * the q value in violation of the RFC. Instead we must copy the internal * structures and sequence declarations from dh_asn1.c, modified to make the q * field optional. */ typedef struct { ASN1_BIT_STRING *seed; BIGNUM *counter; } int_dhvparams; typedef struct { BIGNUM *p; BIGNUM *q; BIGNUM *g; BIGNUM *j; int_dhvparams *vparams; } int_dhx942_dh; ASN1_SEQUENCE(DHvparams) = { ASN1_SIMPLE(int_dhvparams, seed, ASN1_BIT_STRING), ASN1_SIMPLE(int_dhvparams, counter, BIGNUM) } static_ASN1_SEQUENCE_END_name(int_dhvparams, DHvparams) ASN1_SEQUENCE(DHxparams) = { ASN1_SIMPLE(int_dhx942_dh, p, BIGNUM), ASN1_SIMPLE(int_dhx942_dh, g, BIGNUM), ASN1_OPT(int_dhx942_dh, q, BIGNUM), ASN1_OPT(int_dhx942_dh, j, BIGNUM), ASN1_OPT(int_dhx942_dh, vparams, DHvparams), } static_ASN1_SEQUENCE_END_name(int_dhx942_dh, DHxparams) static DH * decode_dh_params(const uint8_t *p, unsigned int len) { int_dhx942_dh *params; DH *dh; dh = DH_new(); if (dh == NULL) return NULL; params = (int_dhx942_dh *)ASN1_item_d2i(NULL, &p, len, ASN1_ITEM_rptr(DHxparams)); if (params == NULL) { DH_free(dh); return NULL; } /* Steal the p, q, and g values from dhparams for dh. Ignore j and * vparams. */ DH_set0_pqg(dh, params->p, params->q, params->g); params->p = params->q = params->g = NULL; ASN1_item_free((ASN1_VALUE *)params, ASN1_ITEM_rptr(DHxparams)); return dh; } #else /* OPENSSL_VERSION_NUMBER < 0x10100000L */ /* * Do the same decoding (except without decoding j and vparams or checking the * sequence length) using the pre-OpenSSL-1.1 asn1_mac.h. Define an internal * function in the form demanded by the macros, then wrap it for caller * convenience. */ static DH * decode_dh_params_int(DH ** a, uint8_t **pp, unsigned int len) { ASN1_INTEGER ai, *aip = NULL; long length = (long) len; M_ASN1_D2I_vars(a, DH *, DH_new); M_ASN1_D2I_Init(); M_ASN1_D2I_start_sequence(); aip = &ai; ai.data = NULL; ai.length = 0; M_ASN1_D2I_get_x(ASN1_INTEGER, aip, d2i_ASN1_INTEGER); if (aip == NULL) return NULL; else { ret->p = ASN1_INTEGER_to_BN(aip, NULL); if (ret->p == NULL) return NULL; if (ai.data != NULL) { OPENSSL_free(ai.data); ai.data = NULL; ai.length = 0; } } M_ASN1_D2I_get_x(ASN1_INTEGER, aip, d2i_ASN1_INTEGER); if (aip == NULL) return NULL; else { ret->g = ASN1_INTEGER_to_BN(aip, NULL); if (ret->g == NULL) return NULL; if (ai.data != NULL) { OPENSSL_free(ai.data); ai.data = NULL; ai.length = 0; } } M_ASN1_D2I_get_opt(aip, d2i_ASN1_INTEGER, V_ASN1_INTEGER); if (aip == NULL || ai.data == NULL) ret->q = NULL; else { ret->q = ASN1_INTEGER_to_BN(aip, NULL); if (ret->q == NULL) return NULL; if (ai.data != NULL) { OPENSSL_free(ai.data); ai.data = NULL; ai.length = 0; } } M_ASN1_D2I_end_sequence(); M_ASN1_D2I_Finish(a, DH_free, 0); } static DH * decode_dh_params(const uint8_t *p, unsigned int len) { uint8_t *ptr = (uint8_t *)p; return decode_dh_params_int(NULL, &ptr, len); } #endif /* OPENSSL_VERSION_NUMBER < 0x10100000L */ static krb5_error_code pkinit_create_sequence_of_principal_identifiers( krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, int type, krb5_pa_data ***e_data_out) { krb5_error_code retval = KRB5KRB_ERR_GENERIC; krb5_external_principal_identifier **krb5_trusted_certifiers = NULL; krb5_data *td_certifiers = NULL; krb5_pa_data **pa_data = NULL; switch(type) { case TD_TRUSTED_CERTIFIERS: retval = create_krb5_trustedCertifiers(context, plg_cryptoctx, req_cryptoctx, id_cryptoctx, &krb5_trusted_certifiers); if (retval) { pkiDebug("create_krb5_trustedCertifiers failed\n"); goto cleanup; } break; case TD_INVALID_CERTIFICATES: retval = create_krb5_invalidCertificates(context, plg_cryptoctx, req_cryptoctx, id_cryptoctx, &krb5_trusted_certifiers); if (retval) { pkiDebug("create_krb5_invalidCertificates failed\n"); goto cleanup; } break; default: retval = -1; goto cleanup; } retval = k5int_encode_krb5_td_trusted_certifiers((krb5_external_principal_identifier *const *)krb5_trusted_certifiers, &td_certifiers); if (retval) { pkiDebug("encode_krb5_td_trusted_certifiers failed\n"); goto cleanup; } #ifdef DEBUG_ASN1 print_buffer_bin((unsigned char *)td_certifiers->data, td_certifiers->length, "/tmp/kdc_td_certifiers"); #endif pa_data = malloc(2 * sizeof(krb5_pa_data *)); if (pa_data == NULL) { retval = ENOMEM; goto cleanup; } pa_data[1] = NULL; pa_data[0] = malloc(sizeof(krb5_pa_data)); if (pa_data[0] == NULL) { free(pa_data); retval = ENOMEM; goto cleanup; } pa_data[0]->pa_type = type; pa_data[0]->length = td_certifiers->length; pa_data[0]->contents = (krb5_octet *)td_certifiers->data; *e_data_out = pa_data; retval = 0; cleanup: if (krb5_trusted_certifiers != NULL) free_krb5_external_principal_identifier(&krb5_trusted_certifiers); free(td_certifiers); return retval; } krb5_error_code pkinit_create_td_trusted_certifiers(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, krb5_pa_data ***e_data_out) { krb5_error_code retval = KRB5KRB_ERR_GENERIC; retval = pkinit_create_sequence_of_principal_identifiers(context, plg_cryptoctx, req_cryptoctx, id_cryptoctx, TD_TRUSTED_CERTIFIERS, e_data_out); return retval; } krb5_error_code pkinit_create_td_invalid_certificate( krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, krb5_pa_data ***e_data_out) { krb5_error_code retval = KRB5KRB_ERR_GENERIC; retval = pkinit_create_sequence_of_principal_identifiers(context, plg_cryptoctx, req_cryptoctx, id_cryptoctx, TD_INVALID_CERTIFICATES, e_data_out); return retval; } krb5_error_code pkinit_create_td_dh_parameters(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, pkinit_plg_opts *opts, krb5_pa_data ***e_data_out) { krb5_error_code retval = ENOMEM; unsigned int buf1_len = 0, buf2_len = 0, buf3_len = 0, i = 0; unsigned char *buf1 = NULL, *buf2 = NULL, *buf3 = NULL; krb5_pa_data **pa_data = NULL; krb5_data *encoded_algId = NULL; krb5_algorithm_identifier **algId = NULL; const BIGNUM *p, *q, *g; if (opts->dh_min_bits > 4096) goto cleanup; if (opts->dh_min_bits <= 1024) { DH_get0_pqg(plg_cryptoctx->dh_1024, &p, &q, &g); retval = pkinit_encode_dh_params(p, g, q, &buf1, &buf1_len); if (retval) goto cleanup; } if (opts->dh_min_bits <= 2048) { DH_get0_pqg(plg_cryptoctx->dh_2048, &p, &q, &g); retval = pkinit_encode_dh_params(p, g, q, &buf2, &buf2_len); if (retval) goto cleanup; } DH_get0_pqg(plg_cryptoctx->dh_4096, &p, &q, &g); retval = pkinit_encode_dh_params(p, g, q, &buf3, &buf3_len); if (retval) goto cleanup; if (opts->dh_min_bits <= 1024) { algId = malloc(4 * sizeof(krb5_algorithm_identifier *)); if (algId == NULL) goto cleanup; algId[3] = NULL; algId[0] = malloc(sizeof(krb5_algorithm_identifier)); if (algId[0] == NULL) goto cleanup; algId[0]->parameters.data = malloc(buf2_len); if (algId[0]->parameters.data == NULL) goto cleanup; memcpy(algId[0]->parameters.data, buf2, buf2_len); algId[0]->parameters.length = buf2_len; algId[0]->algorithm = dh_oid; algId[1] = malloc(sizeof(krb5_algorithm_identifier)); if (algId[1] == NULL) goto cleanup; algId[1]->parameters.data = malloc(buf3_len); if (algId[1]->parameters.data == NULL) goto cleanup; memcpy(algId[1]->parameters.data, buf3, buf3_len); algId[1]->parameters.length = buf3_len; algId[1]->algorithm = dh_oid; algId[2] = malloc(sizeof(krb5_algorithm_identifier)); if (algId[2] == NULL) goto cleanup; algId[2]->parameters.data = malloc(buf1_len); if (algId[2]->parameters.data == NULL) goto cleanup; memcpy(algId[2]->parameters.data, buf1, buf1_len); algId[2]->parameters.length = buf1_len; algId[2]->algorithm = dh_oid; } else if (opts->dh_min_bits <= 2048) { algId = malloc(3 * sizeof(krb5_algorithm_identifier *)); if (algId == NULL) goto cleanup; algId[2] = NULL; algId[0] = malloc(sizeof(krb5_algorithm_identifier)); if (algId[0] == NULL) goto cleanup; algId[0]->parameters.data = malloc(buf2_len); if (algId[0]->parameters.data == NULL) goto cleanup; memcpy(algId[0]->parameters.data, buf2, buf2_len); algId[0]->parameters.length = buf2_len; algId[0]->algorithm = dh_oid; algId[1] = malloc(sizeof(krb5_algorithm_identifier)); if (algId[1] == NULL) goto cleanup; algId[1]->parameters.data = malloc(buf3_len); if (algId[1]->parameters.data == NULL) goto cleanup; memcpy(algId[1]->parameters.data, buf3, buf3_len); algId[1]->parameters.length = buf3_len; algId[1]->algorithm = dh_oid; } else if (opts->dh_min_bits <= 4096) { algId = malloc(2 * sizeof(krb5_algorithm_identifier *)); if (algId == NULL) goto cleanup; algId[1] = NULL; algId[0] = malloc(sizeof(krb5_algorithm_identifier)); if (algId[0] == NULL) goto cleanup; algId[0]->parameters.data = malloc(buf3_len); if (algId[0]->parameters.data == NULL) goto cleanup; memcpy(algId[0]->parameters.data, buf3, buf3_len); algId[0]->parameters.length = buf3_len; algId[0]->algorithm = dh_oid; } retval = k5int_encode_krb5_td_dh_parameters((krb5_algorithm_identifier *const *)algId, &encoded_algId); if (retval) goto cleanup; #ifdef DEBUG_ASN1 print_buffer_bin((unsigned char *)encoded_algId->data, encoded_algId->length, "/tmp/kdc_td_dh_params"); #endif pa_data = malloc(2 * sizeof(krb5_pa_data *)); if (pa_data == NULL) { retval = ENOMEM; goto cleanup; } pa_data[1] = NULL; pa_data[0] = malloc(sizeof(krb5_pa_data)); if (pa_data[0] == NULL) { free(pa_data); retval = ENOMEM; goto cleanup; } pa_data[0]->pa_type = TD_DH_PARAMETERS; pa_data[0]->length = encoded_algId->length; pa_data[0]->contents = (krb5_octet *)encoded_algId->data; *e_data_out = pa_data; retval = 0; cleanup: free(buf1); free(buf2); free(buf3); free(encoded_algId); if (algId != NULL) { while(algId[i] != NULL) { free(algId[i]->parameters.data); free(algId[i]); i++; } free(algId); } return retval; } krb5_error_code pkinit_check_kdc_pkid(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, unsigned char *pdid_buf, unsigned int pkid_len, int *valid_kdcPkId) { PKCS7_ISSUER_AND_SERIAL *is = NULL; const unsigned char *p = pdid_buf; int status = 1; X509 *kdc_cert = sk_X509_value(id_cryptoctx->my_certs, id_cryptoctx->cert_index); *valid_kdcPkId = 0; pkiDebug("found kdcPkId in AS REQ\n"); is = d2i_PKCS7_ISSUER_AND_SERIAL(NULL, &p, (int)pkid_len); if (is == NULL) return KRB5KDC_ERR_PREAUTH_FAILED; status = X509_NAME_cmp(X509_get_issuer_name(kdc_cert), is->issuer); if (!status) { status = ASN1_INTEGER_cmp(X509_get_serialNumber(kdc_cert), is->serial); if (!status) *valid_kdcPkId = 1; } X509_NAME_free(is->issuer); ASN1_INTEGER_free(is->serial); free(is); return 0; } /* Check parameters against a well-known DH group. */ static int pkinit_check_dh_params(DH *dh1, DH *dh2) { const BIGNUM *p1, *p2, *g1, *g2; DH_get0_pqg(dh1, &p1, NULL, &g1); DH_get0_pqg(dh2, &p2, NULL, &g2); if (BN_cmp(p1, p2) != 0) { pkiDebug("p is not well-known group dhparameter\n"); return -1; } if (BN_cmp(g1, g2) != 0) { pkiDebug("bad g dhparameter\n"); return -1; } pkiDebug("good %d dhparams\n", BN_num_bits(p1)); return 0; } krb5_error_code pkinit_process_td_dh_params(krb5_context context, pkinit_plg_crypto_context cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, krb5_algorithm_identifier **algId, int *new_dh_size) { krb5_error_code retval = KRB5KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED; int i = 0, use_sent_dh = 0, ok = 0; pkiDebug("dh parameters\n"); while (algId[i] != NULL) { DH *dh = NULL; const BIGNUM *p; int dh_prime_bits = 0; if (algId[i]->algorithm.length != dh_oid.length || memcmp(algId[i]->algorithm.data, dh_oid.data, dh_oid.length)) goto cleanup; dh = decode_dh_params((uint8_t *)algId[i]->parameters.data, algId[i]->parameters.length); if (dh == NULL) goto cleanup; DH_get0_pqg(dh, &p, NULL, NULL); dh_prime_bits = BN_num_bits(p); pkiDebug("client sent %d DH bits server prefers %d DH bits\n", *new_dh_size, dh_prime_bits); ok = check_dh_wellknown(cryptoctx, dh, dh_prime_bits); if (ok) { *new_dh_size = dh_prime_bits; } if (!ok) { DH_check(dh, &retval); if (retval != 0) { pkiDebug("DH parameters provided by server are unacceptable\n"); retval = KRB5KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED; } else { use_sent_dh = 1; ok = 1; } } if (!use_sent_dh) DH_free(dh); if (ok) { if (req_cryptoctx->dh != NULL) { DH_free(req_cryptoctx->dh); req_cryptoctx->dh = NULL; } if (use_sent_dh) req_cryptoctx->dh = dh; break; } i++; } if (ok) retval = 0; cleanup: return retval; } static int openssl_callback(int ok, X509_STORE_CTX * ctx) { #ifdef DEBUG if (!ok) { X509 *cert = X509_STORE_CTX_get_current_cert(ctx); int err = X509_STORE_CTX_get_error(ctx); const char *errmsg = X509_verify_cert_error_string(err); char buf[DN_BUF_LEN]; X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof(buf)); pkiDebug("cert = %s\n", buf); pkiDebug("callback function: %d (%s)\n", err, errmsg); } #endif return ok; } static int openssl_callback_ignore_crls(int ok, X509_STORE_CTX * ctx) { if (ok) return ok; return X509_STORE_CTX_get_error(ctx) == X509_V_ERR_UNABLE_TO_GET_CRL; } static ASN1_OBJECT * pkinit_pkcs7type2oid(pkinit_plg_crypto_context cryptoctx, int pkcs7_type) { switch (pkcs7_type) { case CMS_SIGN_CLIENT: return cryptoctx->id_pkinit_authData; case CMS_SIGN_SERVER: return cryptoctx->id_pkinit_DHKeyData; case CMS_ENVEL_SERVER: return cryptoctx->id_pkinit_rkeyData; default: return NULL; } } static int wrap_signeddata(unsigned char *data, unsigned int data_len, unsigned char **out, unsigned int *out_len) { unsigned int orig_len = 0, oid_len = 0, tot_len = 0; ASN1_OBJECT *oid = NULL; unsigned char *p = NULL; /* Get length to wrap the original data with SEQUENCE tag */ tot_len = orig_len = ASN1_object_size(1, (int)data_len, V_ASN1_SEQUENCE); /* Add the signedData OID and adjust lengths */ oid = OBJ_nid2obj(NID_pkcs7_signed); oid_len = i2d_ASN1_OBJECT(oid, NULL); tot_len = ASN1_object_size(1, (int)(orig_len+oid_len), V_ASN1_SEQUENCE); p = *out = malloc(tot_len); if (p == NULL) return -1; ASN1_put_object(&p, 1, (int)(orig_len+oid_len), V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL); i2d_ASN1_OBJECT(oid, &p); ASN1_put_object(&p, 1, (int)data_len, 0, V_ASN1_CONTEXT_SPECIFIC); memcpy(p, data, data_len); *out_len = tot_len; return 0; } static int prepare_enc_data(const uint8_t *indata, int indata_len, uint8_t **outdata, int *outdata_len) { int tag, class; long tlen, slen; const uint8_t *p = indata, *oldp; if (ASN1_get_object(&p, &slen, &tag, &class, indata_len) & 0x80) return EINVAL; if (tag != V_ASN1_SEQUENCE) return EINVAL; oldp = p; if (ASN1_get_object(&p, &tlen, &tag, &class, slen) & 0x80) return EINVAL; p += tlen; slen -= (p - oldp); if (ASN1_get_object(&p, &tlen, &tag, &class, slen) & 0x80) return EINVAL; *outdata = malloc(tlen); if (*outdata == NULL) return ENOMEM; memcpy(*outdata, p, tlen); *outdata_len = tlen; return 0; } #ifndef WITHOUT_PKCS11 static struct plugin_file_handle * load_pkcs11_module(krb5_context context, const char *modname, CK_FUNCTION_LIST_PTR_PTR p11p) { struct plugin_file_handle *handle = NULL; CK_RV (*getflist)(CK_FUNCTION_LIST_PTR_PTR); struct errinfo einfo = EMPTY_ERRINFO; const char *errmsg = NULL; void (*sym)(); long err; CK_RV rv; TRACE_PKINIT_PKCS11_OPEN(context, modname); err = krb5int_open_plugin(modname, &handle, &einfo); if (err) { errmsg = k5_get_error(&einfo, err); TRACE_PKINIT_PKCS11_OPEN_FAILED(context, errmsg); goto error; } err = krb5int_get_plugin_func(handle, "C_GetFunctionList", &sym, &einfo); if (err) { errmsg = k5_get_error(&einfo, err); TRACE_PKINIT_PKCS11_GETSYM_FAILED(context, errmsg); goto error; } getflist = (CK_RV (*)())sym; rv = (*getflist)(p11p); if (rv != CKR_OK) { TRACE_PKINIT_PKCS11_GETFLIST_FAILED(context, pkcs11err(rv)); goto error; } return handle; error: k5_free_error(&einfo, errmsg); k5_clear_error(&einfo); if (handle != NULL) krb5int_close_plugin(handle); return NULL; } static krb5_error_code pkinit_login(krb5_context context, pkinit_identity_crypto_context id_cryptoctx, CK_TOKEN_INFO *tip, const char *password) { krb5_data rdat; char *prompt; const char *warning; krb5_prompt kprompt; krb5_prompt_type prompt_type; int r = 0; if (tip->flags & CKF_PROTECTED_AUTHENTICATION_PATH) { rdat.data = NULL; rdat.length = 0; } else if (password != NULL) { rdat.data = strdup(password); rdat.length = strlen(password); } else if (id_cryptoctx->prompter == NULL) { r = KRB5_LIBOS_CANTREADPWD; rdat.data = NULL; } else { if (tip->flags & CKF_USER_PIN_LOCKED) warning = " (Warning: PIN locked)"; else if (tip->flags & CKF_USER_PIN_FINAL_TRY) warning = " (Warning: PIN final try)"; else if (tip->flags & CKF_USER_PIN_COUNT_LOW) warning = " (Warning: PIN count low)"; else warning = ""; if (asprintf(&prompt, "%.*s PIN%s", (int) sizeof (tip->label), tip->label, warning) < 0) return ENOMEM; rdat.data = malloc(tip->ulMaxPinLen + 2); rdat.length = tip->ulMaxPinLen + 1; kprompt.prompt = prompt; kprompt.hidden = 1; kprompt.reply = &rdat; prompt_type = KRB5_PROMPT_TYPE_PREAUTH; /* PROMPTER_INVOCATION */ k5int_set_prompt_types(context, &prompt_type); r = (*id_cryptoctx->prompter)(context, id_cryptoctx->prompter_data, NULL, NULL, 1, &kprompt); k5int_set_prompt_types(context, 0); free(prompt); } if (r == 0) { r = id_cryptoctx->p11->C_Login(id_cryptoctx->session, CKU_USER, (u_char *) rdat.data, rdat.length); if (r != CKR_OK) { TRACE_PKINIT_PKCS11_LOGIN_FAILED(context, pkcs11err(r)); r = KRB5KDC_ERR_PREAUTH_FAILED; } } free(rdat.data); return r; } static krb5_error_code pkinit_open_session(krb5_context context, pkinit_identity_crypto_context cctx) { CK_ULONG i, r; unsigned char *cp; size_t label_len; CK_ULONG count = 0; CK_SLOT_ID_PTR slotlist; CK_TOKEN_INFO tinfo; char *p11name; const char *password; if (cctx->p11_module != NULL) return 0; /* session already open */ /* Load module */ cctx->p11_module = load_pkcs11_module(context, cctx->p11_module_name, &cctx->p11); if (cctx->p11_module == NULL) return KRB5KDC_ERR_PREAUTH_FAILED; /* Init */ if ((r = cctx->p11->C_Initialize(NULL)) != CKR_OK) { pkiDebug("C_Initialize: %s\n", pkcs11err(r)); return KRB5KDC_ERR_PREAUTH_FAILED; } /* Get the list of available slots */ if (cctx->p11->C_GetSlotList(TRUE, NULL, &count) != CKR_OK) return KRB5KDC_ERR_PREAUTH_FAILED; if (count == 0) { TRACE_PKINIT_PKCS11_NO_TOKEN(context); return KRB5KDC_ERR_PREAUTH_FAILED; } slotlist = calloc(count, sizeof(CK_SLOT_ID)); if (slotlist == NULL) return ENOMEM; if (cctx->p11->C_GetSlotList(TRUE, slotlist, &count) != CKR_OK) return KRB5KDC_ERR_PREAUTH_FAILED; /* Look for the given token label, or if none given take the first one */ for (i = 0; i < count; i++) { /* Skip slots that don't match the specified slotid, if given. */ if (cctx->slotid != PK_NOSLOT && cctx->slotid != slotlist[i]) continue; /* Open session */ if ((r = cctx->p11->C_OpenSession(slotlist[i], CKF_SERIAL_SESSION, NULL, NULL, &cctx->session)) != CKR_OK) { pkiDebug("C_OpenSession: %s\n", pkcs11err(r)); return KRB5KDC_ERR_PREAUTH_FAILED; } /* Get token info */ if ((r = cctx->p11->C_GetTokenInfo(slotlist[i], &tinfo)) != CKR_OK) { pkiDebug("C_GetTokenInfo: %s\n", pkcs11err(r)); return KRB5KDC_ERR_PREAUTH_FAILED; } /* tinfo.label is zero-filled but not necessarily zero-terminated. * Find the length, ignoring any trailing spaces. */ for (cp = tinfo.label + sizeof(tinfo.label); cp > tinfo.label; cp--) { if (cp[-1] != '\0' && cp[-1] != ' ') break; } label_len = cp - tinfo.label; TRACE_PKINIT_PKCS11_SLOT(context, (int)slotlist[i], (int)label_len, tinfo.label); if (cctx->token_label == NULL || (strlen(cctx->token_label) == label_len && memcmp(cctx->token_label, tinfo.label, label_len) == 0)) break; cctx->p11->C_CloseSession(cctx->session); } if (i >= count) { free(slotlist); TRACE_PKINIT_PKCS11_NO_MATCH_TOKEN(context); return KRB5KDC_ERR_PREAUTH_FAILED; } cctx->slotid = slotlist[i]; free(slotlist); pkiDebug("open_session: slotid %d (%lu of %d)\n", (int)cctx->slotid, i + 1, (int) count); /* Login if needed */ if (tinfo.flags & CKF_LOGIN_REQUIRED) { if (cctx->p11_module_name != NULL) { if (cctx->slotid != PK_NOSLOT) { if (asprintf(&p11name, "PKCS11:module_name=%s:slotid=%ld:token=%.*s", cctx->p11_module_name, (long)cctx->slotid, (int)label_len, tinfo.label) < 0) p11name = NULL; } else { if (asprintf(&p11name, "PKCS11:module_name=%s,token=%.*s", cctx->p11_module_name, (int)label_len, tinfo.label) < 0) p11name = NULL; } } else { p11name = NULL; } if (cctx->defer_id_prompt) { /* Supply the identity name to be passed to the responder. */ pkinit_set_deferred_id(&cctx->deferred_ids, p11name, tinfo.flags, NULL); free(p11name); return 0; } /* Look up a responder-supplied password for the token. */ password = pkinit_find_deferred_id(cctx->deferred_ids, p11name); free(p11name); r = pkinit_login(context, cctx, &tinfo, password); } return r; } /* * Look for a key that's: * 1. private * 2. capable of the specified operation (usually signing or decrypting) * 3. RSA (this may be wrong but it's all we can do for now) * 4. matches the id of the cert we chose * * You must call pkinit_get_certs before calling pkinit_find_private_key * (that's because we need the ID of the private key) * * pkcs11 says the id of the key doesn't have to match that of the cert, but * I can't figure out any other way to decide which key to use. * * We should only find one key that fits all the requirements. * If there are more than one, we just take the first one. */ krb5_error_code pkinit_find_private_key(pkinit_identity_crypto_context id_cryptoctx, CK_ATTRIBUTE_TYPE usage, CK_OBJECT_HANDLE *objp) { CK_OBJECT_CLASS cls; CK_ATTRIBUTE attrs[4]; CK_ULONG count; CK_KEY_TYPE keytype; unsigned int nattrs = 0; int r; #ifdef PKINIT_USE_KEY_USAGE CK_BBOOL true_false; #endif cls = CKO_PRIVATE_KEY; attrs[nattrs].type = CKA_CLASS; attrs[nattrs].pValue = &cls; attrs[nattrs].ulValueLen = sizeof cls; nattrs++; #ifdef PKINIT_USE_KEY_USAGE /* * Some cards get confused if you try to specify a key usage, * so don't, and hope for the best. This will fail if you have * several keys with the same id and different usages but I have * not seen this on real cards. */ true_false = TRUE; attrs[nattrs].type = usage; attrs[nattrs].pValue = &true_false; attrs[nattrs].ulValueLen = sizeof true_false; nattrs++; #endif keytype = CKK_RSA; attrs[nattrs].type = CKA_KEY_TYPE; attrs[nattrs].pValue = &keytype; attrs[nattrs].ulValueLen = sizeof keytype; nattrs++; attrs[nattrs].type = CKA_ID; attrs[nattrs].pValue = id_cryptoctx->cert_id; attrs[nattrs].ulValueLen = id_cryptoctx->cert_id_len; nattrs++; r = id_cryptoctx->p11->C_FindObjectsInit(id_cryptoctx->session, attrs, nattrs); if (r != CKR_OK) { pkiDebug("krb5_pkinit_sign_data: C_FindObjectsInit: %s\n", pkcs11err(r)); return KRB5KDC_ERR_PREAUTH_FAILED; } r = id_cryptoctx->p11->C_FindObjects(id_cryptoctx->session, objp, 1, &count); id_cryptoctx->p11->C_FindObjectsFinal(id_cryptoctx->session); pkiDebug("found %d private keys (%s)\n", (int)count, pkcs11err(r)); if (r != CKR_OK || count < 1) return KRB5KDC_ERR_PREAUTH_FAILED; return 0; } #endif static krb5_error_code pkinit_decode_data_fs(krb5_context context, pkinit_identity_crypto_context id_cryptoctx, const uint8_t *data, unsigned int data_len, uint8_t **decoded_data, unsigned int *decoded_data_len) { X509 *cert = sk_X509_value(id_cryptoctx->my_certs, id_cryptoctx->cert_index); EVP_PKEY *pkey = id_cryptoctx->my_key; uint8_t *buf; int buf_len, decrypt_len; *decoded_data = NULL; *decoded_data_len = 0; if (cert != NULL && !X509_check_private_key(cert, pkey)) { pkiDebug("private key does not match certificate\n"); return KRB5KDC_ERR_PREAUTH_FAILED; } buf_len = EVP_PKEY_size(pkey); buf = malloc(buf_len + 10); if (buf == NULL) return KRB5KDC_ERR_PREAUTH_FAILED; decrypt_len = EVP_PKEY_decrypt_old(buf, data, data_len, pkey); if (decrypt_len <= 0) { pkiDebug("unable to decrypt received data (len=%d)\n", data_len); free(buf); return KRB5KDC_ERR_PREAUTH_FAILED; } *decoded_data = buf; *decoded_data_len = decrypt_len; return 0; } #ifndef WITHOUT_PKCS11 /* * When using the ActivCard Linux pkcs11 library (v2.0.1), the decrypt function * fails. By inserting an extra function call, which serves nothing but to * change the stack, we were able to work around the issue. If the ActivCard * library is fixed in the future, this function can be inlined back into the * caller. */ static CK_RV pkinit_C_Decrypt(pkinit_identity_crypto_context id_cryptoctx, CK_BYTE_PTR pEncryptedData, CK_ULONG ulEncryptedDataLen, CK_BYTE_PTR pData, CK_ULONG_PTR pulDataLen) { CK_RV rv = CKR_OK; rv = id_cryptoctx->p11->C_Decrypt(id_cryptoctx->session, pEncryptedData, ulEncryptedDataLen, pData, pulDataLen); if (rv == CKR_OK) { pkiDebug("pData %p *pulDataLen %d\n", (void *) pData, (int) *pulDataLen); } return rv; } static krb5_error_code pkinit_decode_data_pkcs11(krb5_context context, pkinit_identity_crypto_context id_cryptoctx, const uint8_t *data, unsigned int data_len, uint8_t **decoded_data, unsigned int *decoded_data_len) { CK_OBJECT_HANDLE obj; CK_ULONG len; CK_MECHANISM mech; uint8_t *cp; int r; *decoded_data = NULL; *decoded_data_len = 0; if (pkinit_open_session(context, id_cryptoctx)) { pkiDebug("can't open pkcs11 session\n"); return KRB5KDC_ERR_PREAUTH_FAILED; } pkinit_find_private_key(id_cryptoctx, CKA_DECRYPT, &obj); mech.mechanism = CKM_RSA_PKCS; mech.pParameter = NULL; mech.ulParameterLen = 0; if ((r = id_cryptoctx->p11->C_DecryptInit(id_cryptoctx->session, &mech, obj)) != CKR_OK) { pkiDebug("C_DecryptInit: 0x%x\n", (int) r); return KRB5KDC_ERR_PREAUTH_FAILED; } pkiDebug("data_len = %d\n", data_len); cp = malloc((size_t) data_len); if (cp == NULL) return ENOMEM; len = data_len; pkiDebug("session %p edata %p edata_len %d data %p datalen @%p %d\n", (void *) id_cryptoctx->session, (void *) data, (int) data_len, (void *) cp, (void *) &len, (int) len); r = pkinit_C_Decrypt(id_cryptoctx, (CK_BYTE_PTR) data, (CK_ULONG) data_len, cp, &len); if (r != CKR_OK) { pkiDebug("C_Decrypt: %s\n", pkcs11err(r)); if (r == CKR_BUFFER_TOO_SMALL) pkiDebug("decrypt %d needs %d\n", (int) data_len, (int) len); return KRB5KDC_ERR_PREAUTH_FAILED; } pkiDebug("decrypt %d -> %d\n", (int) data_len, (int) len); *decoded_data_len = len; *decoded_data = cp; return 0; } #endif krb5_error_code pkinit_decode_data(krb5_context context, pkinit_identity_crypto_context id_cryptoctx, const uint8_t *data, unsigned int data_len, uint8_t **decoded_data, unsigned int *decoded_data_len) { krb5_error_code retval = KRB5KDC_ERR_PREAUTH_FAILED; *decoded_data = NULL; *decoded_data_len = 0; if (id_cryptoctx->pkcs11_method != 1) retval = pkinit_decode_data_fs(context, id_cryptoctx, data, data_len, decoded_data, decoded_data_len); #ifndef WITHOUT_PKCS11 else retval = pkinit_decode_data_pkcs11(context, id_cryptoctx, data, data_len, decoded_data, decoded_data_len); #endif return retval; } static krb5_error_code pkinit_sign_data_fs(krb5_context context, pkinit_identity_crypto_context id_cryptoctx, unsigned char *data, unsigned int data_len, unsigned char **sig, unsigned int *sig_len) { if (create_signature(sig, sig_len, data, data_len, id_cryptoctx->my_key) != 0) { pkiDebug("failed to create the signature\n"); return KRB5KDC_ERR_PREAUTH_FAILED; } return 0; } #ifndef WITHOUT_PKCS11 static krb5_error_code pkinit_sign_data_pkcs11(krb5_context context, pkinit_identity_crypto_context id_cryptoctx, unsigned char *data, unsigned int data_len, unsigned char **sig, unsigned int *sig_len) { CK_OBJECT_HANDLE obj; CK_ULONG len; CK_MECHANISM mech; unsigned char *cp; int r; if (pkinit_open_session(context, id_cryptoctx)) { pkiDebug("can't open pkcs11 session\n"); return KRB5KDC_ERR_PREAUTH_FAILED; } pkinit_find_private_key(id_cryptoctx, CKA_SIGN, &obj); mech.mechanism = id_cryptoctx->mech; mech.pParameter = NULL; mech.ulParameterLen = 0; if ((r = id_cryptoctx->p11->C_SignInit(id_cryptoctx->session, &mech, obj)) != CKR_OK) { pkiDebug("C_SignInit: %s\n", pkcs11err(r)); return KRB5KDC_ERR_PREAUTH_FAILED; } /* * Key len would give an upper bound on sig size, but there's no way to * get that. So guess, and if it's too small, re-malloc. */ len = PK_SIGLEN_GUESS; cp = malloc((size_t) len); if (cp == NULL) return ENOMEM; r = id_cryptoctx->p11->C_Sign(id_cryptoctx->session, data, (CK_ULONG) data_len, cp, &len); if (r == CKR_BUFFER_TOO_SMALL || (r == CKR_OK && len >= PK_SIGLEN_GUESS)) { free(cp); pkiDebug("C_Sign realloc %d\n", (int) len); cp = malloc((size_t) len); r = id_cryptoctx->p11->C_Sign(id_cryptoctx->session, data, (CK_ULONG) data_len, cp, &len); } if (r != CKR_OK) { pkiDebug("C_Sign: %s\n", pkcs11err(r)); return KRB5KDC_ERR_PREAUTH_FAILED; } pkiDebug("sign %d -> %d\n", (int) data_len, (int) len); *sig_len = len; *sig = cp; return 0; } #endif krb5_error_code pkinit_sign_data(krb5_context context, pkinit_identity_crypto_context id_cryptoctx, unsigned char *data, unsigned int data_len, unsigned char **sig, unsigned int *sig_len) { krb5_error_code retval = KRB5KDC_ERR_PREAUTH_FAILED; if (id_cryptoctx == NULL || id_cryptoctx->pkcs11_method != 1) retval = pkinit_sign_data_fs(context, id_cryptoctx, data, data_len, sig, sig_len); #ifndef WITHOUT_PKCS11 else retval = pkinit_sign_data_pkcs11(context, id_cryptoctx, data, data_len, sig, sig_len); #endif return retval; } static krb5_error_code create_signature(unsigned char **sig, unsigned int *sig_len, unsigned char *data, unsigned int data_len, EVP_PKEY *pkey) { krb5_error_code retval = ENOMEM; EVP_MD_CTX *ctx; if (pkey == NULL) return retval; ctx = EVP_MD_CTX_new(); if (ctx == NULL) return ENOMEM; EVP_SignInit(ctx, EVP_sha1()); EVP_SignUpdate(ctx, data, data_len); *sig_len = EVP_PKEY_size(pkey); if ((*sig = malloc(*sig_len)) == NULL) goto cleanup; EVP_SignFinal(ctx, *sig, sig_len, pkey); retval = 0; cleanup: EVP_MD_CTX_free(ctx); return retval; } /* * Note: * This is not the routine the KDC uses to get its certificate. * This routine is intended to be called by the client * to obtain the KDC's certificate from some local storage * to be sent as a hint in its request to the KDC. */ krb5_error_code pkinit_get_kdc_cert(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, krb5_principal princ) { krb5_error_code retval = KRB5KDC_ERR_PREAUTH_FAILED; req_cryptoctx->received_cert = NULL; retval = 0; return retval; } static char * reassemble_pkcs12_name(const char *filename) { char *ret; if (asprintf(&ret, "PKCS12:%s", filename) < 0) return NULL; return ret; } static krb5_error_code pkinit_get_certs_pkcs12(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_opts *idopts, pkinit_identity_crypto_context id_cryptoctx, krb5_principal princ) { krb5_error_code retval = KRB5KDC_ERR_PREAUTH_FAILED; char *prompt_string = NULL; X509 *x = NULL; PKCS12 *p12 = NULL; int ret; FILE *fp; EVP_PKEY *y = NULL; if (idopts->cert_filename == NULL) { pkiDebug("%s: failed to get user's cert location\n", __FUNCTION__); goto cleanup; } if (idopts->key_filename == NULL) { pkiDebug("%s: failed to get user's private key location\n", __FUNCTION__); goto cleanup; } fp = fopen(idopts->cert_filename, "rb"); if (fp == NULL) { TRACE_PKINIT_PKCS_OPEN_FAIL(context, idopts->cert_filename, errno); goto cleanup; } set_cloexec_file(fp); p12 = d2i_PKCS12_fp(fp, NULL); fclose(fp); if (p12 == NULL) { TRACE_PKINIT_PKCS_DECODE_FAIL(context, idopts->cert_filename); goto cleanup; } /* * Try parsing with no pass phrase first. If that fails, * prompt for the pass phrase and try again. */ ret = PKCS12_parse(p12, NULL, &y, &x, NULL); if (ret == 0) { krb5_data rdat; krb5_prompt kprompt; krb5_prompt_type prompt_type; krb5_error_code r; char prompt_reply[128]; char *prompt_prefix = _("Pass phrase for"); char *p12name = reassemble_pkcs12_name(idopts->cert_filename); const char *tmp; TRACE_PKINIT_PKCS_PARSE_FAIL_FIRST(context); if (id_cryptoctx->defer_id_prompt) { /* Supply the identity name to be passed to the responder. */ pkinit_set_deferred_id(&id_cryptoctx->deferred_ids, p12name, 0, NULL); free(p12name); retval = 0; goto cleanup; } /* Try to read a responder-supplied password. */ tmp = pkinit_find_deferred_id(id_cryptoctx->deferred_ids, p12name); free(p12name); if (tmp != NULL) { /* Try using the responder-supplied password. */ rdat.data = (char *)tmp; rdat.length = strlen(tmp); } else if (id_cryptoctx->prompter == NULL) { /* We can't use a prompter. */ goto cleanup; } else { /* Ask using a prompter. */ memset(prompt_reply, '\0', sizeof(prompt_reply)); rdat.data = prompt_reply; rdat.length = sizeof(prompt_reply); if (asprintf(&prompt_string, "%s %s", prompt_prefix, idopts->cert_filename) < 0) { prompt_string = NULL; goto cleanup; } kprompt.prompt = prompt_string; kprompt.hidden = 1; kprompt.reply = &rdat; prompt_type = KRB5_PROMPT_TYPE_PREAUTH; /* PROMPTER_INVOCATION */ k5int_set_prompt_types(context, &prompt_type); r = (*id_cryptoctx->prompter)(context, id_cryptoctx->prompter_data, NULL, NULL, 1, &kprompt); k5int_set_prompt_types(context, 0); if (r) { TRACE_PKINIT_PKCS_PROMPT_FAIL(context); goto cleanup; } } ret = PKCS12_parse(p12, rdat.data, &y, &x, NULL); if (ret == 0) { TRACE_PKINIT_PKCS_PARSE_FAIL_SECOND(context); goto cleanup; } } id_cryptoctx->creds[0] = malloc(sizeof(struct _pkinit_cred_info)); if (id_cryptoctx->creds[0] == NULL) goto cleanup; id_cryptoctx->creds[0]->name = reassemble_pkcs12_name(idopts->cert_filename); id_cryptoctx->creds[0]->cert = x; #ifndef WITHOUT_PKCS11 id_cryptoctx->creds[0]->cert_id = NULL; id_cryptoctx->creds[0]->cert_id_len = 0; #endif id_cryptoctx->creds[0]->key = y; id_cryptoctx->creds[1] = NULL; retval = 0; cleanup: free(prompt_string); if (p12) PKCS12_free(p12); if (retval) { if (x != NULL) X509_free(x); if (y != NULL) EVP_PKEY_free(y); } return retval; } static char * reassemble_files_name(const char *certfile, const char *keyfile) { char *ret; if (keyfile != NULL) { if (asprintf(&ret, "FILE:%s,%s", certfile, keyfile) < 0) return NULL; } else { if (asprintf(&ret, "FILE:%s", certfile) < 0) return NULL; } return ret; } static krb5_error_code pkinit_load_fs_cert_and_key(krb5_context context, pkinit_identity_crypto_context id_cryptoctx, char *certname, char *keyname, int cindex) { krb5_error_code retval; X509 *x = NULL; EVP_PKEY *y = NULL; char *fsname = NULL; const char *password; fsname = reassemble_files_name(certname, keyname); /* Try to read a responder-supplied password. */ password = pkinit_find_deferred_id(id_cryptoctx->deferred_ids, fsname); /* Load the certificate. */ retval = get_cert(certname, &x); if (retval) { retval = oerr(context, retval, _("Cannot read certificate file '%s'"), certname); } if (retval || x == NULL) goto cleanup; /* Load the key. */ retval = get_key(context, id_cryptoctx, keyname, fsname, &y, password); if (retval) retval = oerr(context, retval, _("Cannot read key file '%s'"), fsname); if (retval || y == NULL) goto cleanup; id_cryptoctx->creds[cindex] = malloc(sizeof(struct _pkinit_cred_info)); if (id_cryptoctx->creds[cindex] == NULL) { retval = ENOMEM; goto cleanup; } id_cryptoctx->creds[cindex]->name = reassemble_files_name(certname, keyname); id_cryptoctx->creds[cindex]->cert = x; #ifndef WITHOUT_PKCS11 id_cryptoctx->creds[cindex]->cert_id = NULL; id_cryptoctx->creds[cindex]->cert_id_len = 0; #endif id_cryptoctx->creds[cindex]->key = y; id_cryptoctx->creds[cindex+1] = NULL; retval = 0; cleanup: free(fsname); if (retval != 0 || y == NULL) { if (x != NULL) X509_free(x); if (y != NULL) EVP_PKEY_free(y); } return retval; } static krb5_error_code pkinit_get_certs_fs(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_opts *idopts, pkinit_identity_crypto_context id_cryptoctx, krb5_principal princ) { krb5_error_code retval = KRB5KDC_ERR_PREAUTH_FAILED; if (idopts->cert_filename == NULL) { pkiDebug("%s: failed to get user's cert location\n", __FUNCTION__); goto cleanup; } if (idopts->key_filename == NULL) { TRACE_PKINIT_NO_PRIVKEY(context); goto cleanup; } retval = pkinit_load_fs_cert_and_key(context, id_cryptoctx, idopts->cert_filename, idopts->key_filename, 0); cleanup: return retval; } static krb5_error_code pkinit_get_certs_dir(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_opts *idopts, pkinit_identity_crypto_context id_cryptoctx, krb5_principal princ) { krb5_error_code retval = ENOMEM; DIR *d = NULL; struct dirent *dentry = NULL; char certname[1024]; char keyname[1024]; int i = 0, len; char *dirname, *suf; if (idopts->cert_filename == NULL) { TRACE_PKINIT_NO_CERT(context); return ENOENT; } dirname = idopts->cert_filename; d = opendir(dirname); if (d == NULL) return errno; /* * We'll assume that certs are named XXX.crt and the corresponding * key is named XXX.key */ while ((i < MAX_CREDS_ALLOWED) && (dentry = readdir(d)) != NULL) { /* Ignore subdirectories and anything starting with a dot */ #ifdef DT_DIR if (dentry->d_type == DT_DIR) continue; #endif if (dentry->d_name[0] == '.') continue; len = strlen(dentry->d_name); if (len < 5) continue; suf = dentry->d_name + (len - 4); if (strncmp(suf, ".crt", 4) != 0) continue; /* Checked length */ if (strlen(dirname) + strlen(dentry->d_name) + 2 > sizeof(certname)) { pkiDebug("%s: Path too long -- directory '%s' and file '%s'\n", __FUNCTION__, dirname, dentry->d_name); continue; } snprintf(certname, sizeof(certname), "%s/%s", dirname, dentry->d_name); snprintf(keyname, sizeof(keyname), "%s/%s", dirname, dentry->d_name); len = strlen(keyname); keyname[len - 3] = 'k'; keyname[len - 2] = 'e'; keyname[len - 1] = 'y'; retval = pkinit_load_fs_cert_and_key(context, id_cryptoctx, certname, keyname, i); if (retval == 0) { TRACE_PKINIT_LOADED_CERT(context, dentry->d_name); i++; } else continue; } if (!id_cryptoctx->defer_id_prompt && i == 0) { TRACE_PKINIT_NO_CERT_AND_KEY(context, idopts->cert_filename); retval = ENOENT; goto cleanup; } retval = 0; cleanup: if (d) closedir(d); return retval; } #ifndef WITHOUT_PKCS11 static char * reassemble_pkcs11_name(pkinit_identity_opts *idopts) { struct k5buf buf; int n = 0; char *ret; k5_buf_init_dynamic(&buf); k5_buf_add(&buf, "PKCS11:"); n = 0; if (idopts->p11_module_name != NULL) { k5_buf_add_fmt(&buf, "%smodule_name=%s", n++ ? ":" : "", idopts->p11_module_name); } if (idopts->token_label != NULL) { k5_buf_add_fmt(&buf, "%stoken=%s", n++ ? ":" : "", idopts->token_label); } if (idopts->cert_label != NULL) { k5_buf_add_fmt(&buf, "%scertlabel=%s", n++ ? ":" : "", idopts->cert_label); } if (idopts->cert_id_string != NULL) { k5_buf_add_fmt(&buf, "%scertid=%s", n++ ? ":" : "", idopts->cert_id_string); } if (idopts->slotid != PK_NOSLOT) { k5_buf_add_fmt(&buf, "%sslotid=%ld", n++ ? ":" : "", (long)idopts->slotid); } if (k5_buf_status(&buf) == 0) ret = strdup(buf.data); else ret = NULL; k5_buf_free(&buf); return ret; } static krb5_error_code pkinit_get_certs_pkcs11(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_opts *idopts, pkinit_identity_crypto_context id_cryptoctx, krb5_principal princ) { #ifdef PKINIT_USE_MECH_LIST CK_MECHANISM_TYPE_PTR mechp; CK_MECHANISM_INFO info; #endif CK_OBJECT_CLASS cls; CK_OBJECT_HANDLE obj; CK_ATTRIBUTE attrs[4]; CK_ULONG count; CK_CERTIFICATE_TYPE certtype; CK_BYTE_PTR cert = NULL, cert_id; const unsigned char *cp; int i, r; unsigned int nattrs; X509 *x = NULL; /* Copy stuff from idopts -> id_cryptoctx */ if (idopts->p11_module_name != NULL) { free(id_cryptoctx->p11_module_name); id_cryptoctx->p11_module_name = strdup(idopts->p11_module_name); if (id_cryptoctx->p11_module_name == NULL) return ENOMEM; } if (idopts->token_label != NULL) { id_cryptoctx->token_label = strdup(idopts->token_label); if (id_cryptoctx->token_label == NULL) return ENOMEM; } if (idopts->cert_label != NULL) { id_cryptoctx->cert_label = strdup(idopts->cert_label); if (id_cryptoctx->cert_label == NULL) return ENOMEM; } /* Convert the ascii cert_id string into a binary blob */ if (idopts->cert_id_string != NULL) { r = k5_hex_decode(idopts->cert_id_string, &id_cryptoctx->cert_id, &id_cryptoctx->cert_id_len); if (r != 0) { pkiDebug("Failed to convert certid string [%s]\n", idopts->cert_id_string); return r; } } id_cryptoctx->slotid = idopts->slotid; id_cryptoctx->pkcs11_method = 1; r = pkinit_open_session(context, id_cryptoctx); if (r != 0) return r; if (id_cryptoctx->defer_id_prompt) { /* * We need to reset all of the PKCS#11 state, so that the next time we * poke at it, it'll be in as close to the state it was in after we * loaded it the first time as we can make it. */ pkinit_fini_pkcs11(id_cryptoctx); pkinit_init_pkcs11(id_cryptoctx); return 0; } #ifndef PKINIT_USE_MECH_LIST /* * We'd like to use CKM_SHA1_RSA_PKCS for signing if it's available, but * many cards seems to be confused about whether they are capable of * this or not. The safe thing seems to be to ignore the mechanism list, * always use CKM_RSA_PKCS and calculate the sha1 digest ourselves. */ id_cryptoctx->mech = CKM_RSA_PKCS; #else if ((r = id_cryptoctx->p11->C_GetMechanismList(id_cryptoctx->slotid, NULL, &count)) != CKR_OK || count <= 0) { pkiDebug("C_GetMechanismList: %s\n", pkcs11err(r)); return KRB5KDC_ERR_PREAUTH_FAILED; } mechp = malloc(count * sizeof (CK_MECHANISM_TYPE)); if (mechp == NULL) return ENOMEM; if ((r = id_cryptoctx->p11->C_GetMechanismList(id_cryptoctx->slotid, mechp, &count)) != CKR_OK) return KRB5KDC_ERR_PREAUTH_FAILED; for (i = 0; i < count; i++) { if ((r = id_cryptoctx->p11->C_GetMechanismInfo(id_cryptoctx->slotid, mechp[i], &info)) != CKR_OK) return KRB5KDC_ERR_PREAUTH_FAILED; #ifdef DEBUG_MECHINFO pkiDebug("mech %x flags %x\n", (int) mechp[i], (int) info.flags); if ((info.flags & (CKF_SIGN|CKF_DECRYPT)) == (CKF_SIGN|CKF_DECRYPT)) pkiDebug(" this mech is good for sign & decrypt\n"); #endif if (mechp[i] == CKM_RSA_PKCS) { /* This seems backwards... */ id_cryptoctx->mech = (info.flags & CKF_SIGN) ? CKM_SHA1_RSA_PKCS : CKM_RSA_PKCS; } } free(mechp); pkiDebug("got %d mechs from card\n", (int) count); #endif cls = CKO_CERTIFICATE; attrs[0].type = CKA_CLASS; attrs[0].pValue = &cls; attrs[0].ulValueLen = sizeof cls; certtype = CKC_X_509; attrs[1].type = CKA_CERTIFICATE_TYPE; attrs[1].pValue = &certtype; attrs[1].ulValueLen = sizeof certtype; nattrs = 2; /* If a cert id and/or label were given, use them too */ if (id_cryptoctx->cert_id_len > 0) { attrs[nattrs].type = CKA_ID; attrs[nattrs].pValue = id_cryptoctx->cert_id; attrs[nattrs].ulValueLen = id_cryptoctx->cert_id_len; nattrs++; } if (id_cryptoctx->cert_label != NULL) { attrs[nattrs].type = CKA_LABEL; attrs[nattrs].pValue = id_cryptoctx->cert_label; attrs[nattrs].ulValueLen = strlen(id_cryptoctx->cert_label); nattrs++; } r = id_cryptoctx->p11->C_FindObjectsInit(id_cryptoctx->session, attrs, nattrs); if (r != CKR_OK) { pkiDebug("C_FindObjectsInit: %s\n", pkcs11err(r)); return KRB5KDC_ERR_PREAUTH_FAILED; } for (i = 0; ; i++) { if (i >= MAX_CREDS_ALLOWED) return KRB5KDC_ERR_PREAUTH_FAILED; /* Look for x.509 cert */ if ((r = id_cryptoctx->p11->C_FindObjects(id_cryptoctx->session, &obj, 1, &count)) != CKR_OK || count <= 0) { id_cryptoctx->creds[i] = NULL; break; } /* Get cert and id len */ attrs[0].type = CKA_VALUE; attrs[0].pValue = NULL; attrs[0].ulValueLen = 0; attrs[1].type = CKA_ID; attrs[1].pValue = NULL; attrs[1].ulValueLen = 0; if ((r = id_cryptoctx->p11->C_GetAttributeValue(id_cryptoctx->session, obj, attrs, 2)) != CKR_OK && r != CKR_BUFFER_TOO_SMALL) { pkiDebug("C_GetAttributeValue: %s\n", pkcs11err(r)); return KRB5KDC_ERR_PREAUTH_FAILED; } cert = (CK_BYTE_PTR) malloc((size_t) attrs[0].ulValueLen + 1); cert_id = (CK_BYTE_PTR) malloc((size_t) attrs[1].ulValueLen + 1); if (cert == NULL || cert_id == NULL) return ENOMEM; /* Read the cert and id off the card */ attrs[0].type = CKA_VALUE; attrs[0].pValue = cert; attrs[1].type = CKA_ID; attrs[1].pValue = cert_id; if ((r = id_cryptoctx->p11->C_GetAttributeValue(id_cryptoctx->session, obj, attrs, 2)) != CKR_OK) { pkiDebug("C_GetAttributeValue: %s\n", pkcs11err(r)); return KRB5KDC_ERR_PREAUTH_FAILED; } pkiDebug("cert %d size %d id %d idlen %d\n", i, (int) attrs[0].ulValueLen, (int) cert_id[0], (int) attrs[1].ulValueLen); cp = (unsigned char *) cert; x = d2i_X509(NULL, &cp, (int) attrs[0].ulValueLen); if (x == NULL) return KRB5KDC_ERR_PREAUTH_FAILED; id_cryptoctx->creds[i] = malloc(sizeof(struct _pkinit_cred_info)); if (id_cryptoctx->creds[i] == NULL) return KRB5KDC_ERR_PREAUTH_FAILED; id_cryptoctx->creds[i]->name = reassemble_pkcs11_name(idopts); id_cryptoctx->creds[i]->cert = x; id_cryptoctx->creds[i]->key = NULL; id_cryptoctx->creds[i]->cert_id = cert_id; id_cryptoctx->creds[i]->cert_id_len = attrs[1].ulValueLen; free(cert); } id_cryptoctx->p11->C_FindObjectsFinal(id_cryptoctx->session); if (cert == NULL) return KRB5KDC_ERR_PREAUTH_FAILED; return 0; } #endif static void free_cred_info(krb5_context context, pkinit_identity_crypto_context id_cryptoctx, struct _pkinit_cred_info *cred) { if (cred != NULL) { if (cred->cert != NULL) X509_free(cred->cert); if (cred->key != NULL) EVP_PKEY_free(cred->key); #ifndef WITHOUT_PKCS11 free(cred->cert_id); #endif free(cred->name); free(cred); } } krb5_error_code crypto_free_cert_info(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx) { int i; if (id_cryptoctx == NULL) return EINVAL; for (i = 0; i < MAX_CREDS_ALLOWED; i++) { if (id_cryptoctx->creds[i] != NULL) { free_cred_info(context, id_cryptoctx, id_cryptoctx->creds[i]); id_cryptoctx->creds[i] = NULL; } } return 0; } krb5_error_code crypto_load_certs(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_opts *idopts, pkinit_identity_crypto_context id_cryptoctx, krb5_principal princ, krb5_boolean defer_id_prompts) { krb5_error_code retval; id_cryptoctx->defer_id_prompt = defer_id_prompts; switch(idopts->idtype) { case IDTYPE_FILE: retval = pkinit_get_certs_fs(context, plg_cryptoctx, req_cryptoctx, idopts, id_cryptoctx, princ); break; case IDTYPE_DIR: retval = pkinit_get_certs_dir(context, plg_cryptoctx, req_cryptoctx, idopts, id_cryptoctx, princ); break; #ifndef WITHOUT_PKCS11 case IDTYPE_PKCS11: retval = pkinit_get_certs_pkcs11(context, plg_cryptoctx, req_cryptoctx, idopts, id_cryptoctx, princ); break; #endif case IDTYPE_PKCS12: retval = pkinit_get_certs_pkcs12(context, plg_cryptoctx, req_cryptoctx, idopts, id_cryptoctx, princ); break; default: retval = EINVAL; } if (retval) goto cleanup; cleanup: return retval; } /* * Get certificate Key Usage and Extended Key Usage */ static krb5_error_code crypto_retrieve_X509_key_usage(krb5_context context, pkinit_plg_crypto_context plgcctx, pkinit_req_crypto_context reqcctx, X509 *x, unsigned int *ret_ku_bits, unsigned int *ret_eku_bits) { krb5_error_code retval = 0; int i; unsigned int eku_bits = 0, ku_bits = 0; ASN1_BIT_STRING *usage = NULL; if (ret_ku_bits == NULL && ret_eku_bits == NULL) return EINVAL; if (ret_eku_bits) *ret_eku_bits = 0; else { pkiDebug("%s: EKUs not requested, not checking\n", __FUNCTION__); goto check_kus; } /* Start with Extended Key usage */ i = X509_get_ext_by_NID(x, NID_ext_key_usage, -1); if (i >= 0) { EXTENDED_KEY_USAGE *eku; eku = X509_get_ext_d2i(x, NID_ext_key_usage, NULL, NULL); if (eku) { for (i = 0; i < sk_ASN1_OBJECT_num(eku); i++) { ASN1_OBJECT *certoid; certoid = sk_ASN1_OBJECT_value(eku, i); if ((OBJ_cmp(certoid, plgcctx->id_pkinit_KPClientAuth)) == 0) eku_bits |= PKINIT_EKU_PKINIT; else if ((OBJ_cmp(certoid, OBJ_nid2obj(NID_ms_smartcard_login))) == 0) eku_bits |= PKINIT_EKU_MSSCLOGIN; else if ((OBJ_cmp(certoid, OBJ_nid2obj(NID_client_auth))) == 0) eku_bits |= PKINIT_EKU_CLIENTAUTH; else if ((OBJ_cmp(certoid, OBJ_nid2obj(NID_email_protect))) == 0) eku_bits |= PKINIT_EKU_EMAILPROTECTION; } EXTENDED_KEY_USAGE_free(eku); } } pkiDebug("%s: returning eku 0x%08x\n", __FUNCTION__, eku_bits); *ret_eku_bits = eku_bits; check_kus: /* Now the Key Usage bits */ if (ret_ku_bits) *ret_ku_bits = 0; else { pkiDebug("%s: KUs not requested, not checking\n", __FUNCTION__); goto out; } /* Make sure usage exists before checking bits */ X509_check_ca(x); usage = X509_get_ext_d2i(x, NID_key_usage, NULL, NULL); if (usage) { if (!ku_reject(x, X509v3_KU_DIGITAL_SIGNATURE)) ku_bits |= PKINIT_KU_DIGITALSIGNATURE; if (!ku_reject(x, X509v3_KU_KEY_ENCIPHERMENT)) ku_bits |= PKINIT_KU_KEYENCIPHERMENT; ASN1_BIT_STRING_free(usage); } pkiDebug("%s: returning ku 0x%08x\n", __FUNCTION__, ku_bits); *ret_ku_bits = ku_bits; retval = 0; out: return retval; } static krb5_error_code rfc2253_name(X509_NAME *name, char **str_out) { BIO *b = NULL; char *str; *str_out = NULL; b = BIO_new(BIO_s_mem()); if (b == NULL) return ENOMEM; if (X509_NAME_print_ex(b, name, 0, XN_FLAG_SEP_COMMA_PLUS) < 0) goto error; str = calloc(BIO_number_written(b) + 1, 1); if (str == NULL) goto error; BIO_read(b, str, BIO_number_written(b)); BIO_free(b); *str_out = str; return 0; error: BIO_free(b); return ENOMEM; } /* * Get number of certificates available after crypto_load_certs() */ static krb5_error_code crypto_cert_get_count(pkinit_identity_crypto_context id_cryptoctx, int *cert_count) { int count; *cert_count = 0; if (id_cryptoctx == NULL || id_cryptoctx->creds[0] == NULL) return EINVAL; for (count = 0; count <= MAX_CREDS_ALLOWED && id_cryptoctx->creds[count] != NULL; count++); *cert_count = count; return 0; } void crypto_cert_free_matching_data(krb5_context context, pkinit_cert_matching_data *md) { int i; if (md == NULL) return; free(md->subject_dn); free(md->issuer_dn); for (i = 0; md->sans != NULL && md->sans[i] != NULL; i++) krb5_free_principal(context, md->sans[i]); free(md->sans); for (i = 0; md->upns != NULL && md->upns[i] != NULL; i++) free(md->upns[i]); free(md->upns); free(md); } /* * Free certificate matching data. */ void crypto_cert_free_matching_data_list(krb5_context context, pkinit_cert_matching_data **list) { int i; for (i = 0; list != NULL && list[i] != NULL; i++) crypto_cert_free_matching_data(context, list[i]); free(list); } /* * Get certificate matching data for cert. */ static krb5_error_code get_matching_data(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, X509 *cert, pkinit_cert_matching_data **md_out) { krb5_error_code ret = ENOMEM; pkinit_cert_matching_data *md = NULL; *md_out = NULL; md = calloc(1, sizeof(*md)); if (md == NULL) goto cleanup; ret = rfc2253_name(X509_get_subject_name(cert), &md->subject_dn); if (ret) goto cleanup; ret = rfc2253_name(X509_get_issuer_name(cert), &md->issuer_dn); if (ret) goto cleanup; /* Get the SAN data. */ ret = crypto_retrieve_X509_sans(context, plg_cryptoctx, req_cryptoctx, cert, &md->sans, &md->upns, NULL); if (ret) goto cleanup; /* Get the KU and EKU data. */ ret = crypto_retrieve_X509_key_usage(context, plg_cryptoctx, req_cryptoctx, cert, &md->ku_bits, &md->eku_bits); if (ret) goto cleanup; *md_out = md; md = NULL; cleanup: crypto_cert_free_matching_data(context, md); return ret; } krb5_error_code crypto_cert_get_matching_data(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, pkinit_cert_matching_data ***md_out) { krb5_error_code ret; pkinit_cert_matching_data **md_list = NULL; int count, i; ret = crypto_cert_get_count(id_cryptoctx, &count); if (ret) goto cleanup; md_list = calloc(count + 1, sizeof(*md_list)); if (md_list == NULL) { ret = ENOMEM; goto cleanup; } for (i = 0; i < count; i++) { ret = get_matching_data(context, plg_cryptoctx, req_cryptoctx, id_cryptoctx->creds[i]->cert, &md_list[i]); if (ret) { pkiDebug("%s: crypto_cert_get_matching_data error %d, %s\n", __FUNCTION__, ret, error_message(ret)); goto cleanup; } } *md_out = md_list; md_list = NULL; cleanup: crypto_cert_free_matching_data_list(context, md_list); return ret; } /* * Set the certificate in idctx->creds[cred_index] as the selected certificate. */ krb5_error_code crypto_cert_select(krb5_context context, pkinit_identity_crypto_context idctx, size_t cred_index) { pkinit_cred_info ci = NULL; if (cred_index >= MAX_CREDS_ALLOWED || idctx->creds[cred_index] == NULL) return ENOENT; ci = idctx->creds[cred_index]; /* copy the selected cert into our id_cryptoctx */ if (idctx->my_certs != NULL) sk_X509_pop_free(idctx->my_certs, X509_free); idctx->my_certs = sk_X509_new_null(); sk_X509_push(idctx->my_certs, ci->cert); free(idctx->identity); /* hang on to the selected credential name */ if (ci->name != NULL) idctx->identity = strdup(ci->name); else idctx->identity = NULL; ci->cert = NULL; /* Don't free it twice */ idctx->cert_index = 0; if (idctx->pkcs11_method != 1) { idctx->my_key = ci->key; ci->key = NULL; /* Don't free it twice */ } #ifndef WITHOUT_PKCS11 else { idctx->cert_id = ci->cert_id; ci->cert_id = NULL; /* Don't free it twice */ idctx->cert_id_len = ci->cert_id_len; } #endif return 0; } /* * Choose the default certificate as "the chosen one" */ krb5_error_code crypto_cert_select_default(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx) { krb5_error_code retval; int cert_count; retval = crypto_cert_get_count(id_cryptoctx, &cert_count); if (retval) goto errout; if (cert_count != 1) { TRACE_PKINIT_NO_DEFAULT_CERT(context, cert_count); retval = EINVAL; goto errout; } /* copy the selected cert into our id_cryptoctx */ if (id_cryptoctx->my_certs != NULL) { sk_X509_pop_free(id_cryptoctx->my_certs, X509_free); } id_cryptoctx->my_certs = sk_X509_new_null(); sk_X509_push(id_cryptoctx->my_certs, id_cryptoctx->creds[0]->cert); id_cryptoctx->creds[0]->cert = NULL; /* Don't free it twice */ id_cryptoctx->cert_index = 0; /* hang on to the selected credential name */ if (id_cryptoctx->creds[0]->name != NULL) id_cryptoctx->identity = strdup(id_cryptoctx->creds[0]->name); else id_cryptoctx->identity = NULL; if (id_cryptoctx->pkcs11_method != 1) { id_cryptoctx->my_key = id_cryptoctx->creds[0]->key; id_cryptoctx->creds[0]->key = NULL; /* Don't free it twice */ } #ifndef WITHOUT_PKCS11 else { id_cryptoctx->cert_id = id_cryptoctx->creds[0]->cert_id; id_cryptoctx->creds[0]->cert_id = NULL; /* Don't free it twice */ id_cryptoctx->cert_id_len = id_cryptoctx->creds[0]->cert_id_len; } #endif retval = 0; errout: return retval; } static krb5_error_code load_cas_and_crls(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, int catype, char *filename) { STACK_OF(X509_INFO) *sk = NULL; STACK_OF(X509) *ca_certs = NULL; STACK_OF(X509_CRL) *ca_crls = NULL; BIO *in = NULL; krb5_error_code retval = ENOMEM; int i = 0; /* If there isn't already a stack in the context, * create a temporary one now */ switch(catype) { case CATYPE_ANCHORS: if (id_cryptoctx->trustedCAs != NULL) ca_certs = id_cryptoctx->trustedCAs; else { ca_certs = sk_X509_new_null(); if (ca_certs == NULL) return ENOMEM; } break; case CATYPE_INTERMEDIATES: if (id_cryptoctx->intermediateCAs != NULL) ca_certs = id_cryptoctx->intermediateCAs; else { ca_certs = sk_X509_new_null(); if (ca_certs == NULL) return ENOMEM; } break; case CATYPE_CRLS: if (id_cryptoctx->revoked != NULL) ca_crls = id_cryptoctx->revoked; else { ca_crls = sk_X509_CRL_new_null(); if (ca_crls == NULL) return ENOMEM; } break; default: return ENOTSUP; } if (!(in = BIO_new_file(filename, "r"))) { retval = oerr(context, 0, _("Cannot open file '%s'"), filename); goto cleanup; } /* This loads from a file, a stack of x509/crl/pkey sets */ if ((sk = PEM_X509_INFO_read_bio(in, NULL, NULL, NULL)) == NULL) { pkiDebug("%s: error reading file '%s'\n", __FUNCTION__, filename); retval = oerr(context, 0, _("Cannot read file '%s'"), filename); goto cleanup; } /* scan over the stack created from loading the file contents, * weed out duplicates, and push new ones onto the return stack */ for (i = 0; i < sk_X509_INFO_num(sk); i++) { X509_INFO *xi = sk_X509_INFO_value(sk, i); if (xi != NULL && xi->x509 != NULL && catype != CATYPE_CRLS) { int j = 0, size = sk_X509_num(ca_certs), flag = 0; if (!size) { sk_X509_push(ca_certs, xi->x509); xi->x509 = NULL; continue; } for (j = 0; j < size; j++) { X509 *x = sk_X509_value(ca_certs, j); flag = X509_cmp(x, xi->x509); if (flag == 0) break; else continue; } if (flag != 0) { sk_X509_push(ca_certs, X509_dup(xi->x509)); } } else if (xi != NULL && xi->crl != NULL && catype == CATYPE_CRLS) { int j = 0, size = sk_X509_CRL_num(ca_crls), flag = 0; if (!size) { sk_X509_CRL_push(ca_crls, xi->crl); xi->crl = NULL; continue; } for (j = 0; j < size; j++) { X509_CRL *x = sk_X509_CRL_value(ca_crls, j); flag = X509_CRL_cmp(x, xi->crl); if (flag == 0) break; else continue; } if (flag != 0) { sk_X509_CRL_push(ca_crls, X509_CRL_dup(xi->crl)); } } } /* If we added something and there wasn't a stack in the * context before, add the temporary stack to the context. */ switch(catype) { case CATYPE_ANCHORS: if (sk_X509_num(ca_certs) == 0) { TRACE_PKINIT_NO_CA_ANCHOR(context, filename); if (id_cryptoctx->trustedCAs == NULL) sk_X509_free(ca_certs); } else { if (id_cryptoctx->trustedCAs == NULL) id_cryptoctx->trustedCAs = ca_certs; } break; case CATYPE_INTERMEDIATES: if (sk_X509_num(ca_certs) == 0) { TRACE_PKINIT_NO_CA_INTERMEDIATE(context, filename); if (id_cryptoctx->intermediateCAs == NULL) sk_X509_free(ca_certs); } else { if (id_cryptoctx->intermediateCAs == NULL) id_cryptoctx->intermediateCAs = ca_certs; } break; case CATYPE_CRLS: if (sk_X509_CRL_num(ca_crls) == 0) { TRACE_PKINIT_NO_CRL(context, filename); if (id_cryptoctx->revoked == NULL) sk_X509_CRL_free(ca_crls); } else { if (id_cryptoctx->revoked == NULL) id_cryptoctx->revoked = ca_crls; } break; default: /* Should have been caught above! */ retval = EINVAL; goto cleanup; break; } retval = 0; cleanup: if (in != NULL) BIO_free(in); if (sk != NULL) sk_X509_INFO_pop_free(sk, X509_INFO_free); return retval; } static krb5_error_code load_cas_and_crls_dir(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, int catype, char *dirname) { krb5_error_code retval = EINVAL; DIR *d = NULL; struct dirent *dentry = NULL; char filename[1024]; if (dirname == NULL) return EINVAL; d = opendir(dirname); if (d == NULL) return ENOENT; while ((dentry = readdir(d))) { if (strlen(dirname) + strlen(dentry->d_name) + 2 > sizeof(filename)) { pkiDebug("%s: Path too long -- directory '%s' and file '%s'\n", __FUNCTION__, dirname, dentry->d_name); goto cleanup; } /* Ignore subdirectories and anything starting with a dot */ #ifdef DT_DIR if (dentry->d_type == DT_DIR) continue; #endif if (dentry->d_name[0] == '.') continue; snprintf(filename, sizeof(filename), "%s/%s", dirname, dentry->d_name); retval = load_cas_and_crls(context, plg_cryptoctx, req_cryptoctx, id_cryptoctx, catype, filename); if (retval) goto cleanup; } retval = 0; cleanup: if (d != NULL) closedir(d); return retval; } krb5_error_code crypto_load_cas_and_crls(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_opts *idopts, pkinit_identity_crypto_context id_cryptoctx, int idtype, int catype, char *id) { switch (idtype) { case IDTYPE_FILE: TRACE_PKINIT_LOAD_FROM_FILE(context, id); return load_cas_and_crls(context, plg_cryptoctx, req_cryptoctx, id_cryptoctx, catype, id); break; case IDTYPE_DIR: TRACE_PKINIT_LOAD_FROM_DIR(context, id); return load_cas_and_crls_dir(context, plg_cryptoctx, req_cryptoctx, id_cryptoctx, catype, id); break; default: return ENOTSUP; break; } } static krb5_error_code create_identifiers_from_stack(STACK_OF(X509) *sk, krb5_external_principal_identifier *** ids) { int i = 0, sk_size = sk_X509_num(sk); krb5_external_principal_identifier **krb5_cas = NULL; X509 *x = NULL; X509_NAME *xn = NULL; unsigned char *p = NULL; int len = 0; PKCS7_ISSUER_AND_SERIAL *is = NULL; char buf[DN_BUF_LEN]; *ids = NULL; krb5_cas = calloc(sk_size + 1, sizeof(*krb5_cas)); if (krb5_cas == NULL) return ENOMEM; for (i = 0; i < sk_size; i++) { krb5_cas[i] = malloc(sizeof(krb5_external_principal_identifier)); x = sk_X509_value(sk, i); X509_NAME_oneline(X509_get_subject_name(x), buf, sizeof(buf)); pkiDebug("#%d cert= %s\n", i, buf); /* fill-in subjectName */ krb5_cas[i]->subjectName.magic = 0; krb5_cas[i]->subjectName.length = 0; krb5_cas[i]->subjectName.data = NULL; xn = X509_get_subject_name(x); len = i2d_X509_NAME(xn, NULL); if ((p = malloc((size_t) len)) == NULL) goto oom; krb5_cas[i]->subjectName.data = (char *)p; i2d_X509_NAME(xn, &p); krb5_cas[i]->subjectName.length = len; /* fill-in issuerAndSerialNumber */ krb5_cas[i]->issuerAndSerialNumber.length = 0; krb5_cas[i]->issuerAndSerialNumber.magic = 0; krb5_cas[i]->issuerAndSerialNumber.data = NULL; is = PKCS7_ISSUER_AND_SERIAL_new(); if (is == NULL) goto oom; X509_NAME_set(&is->issuer, X509_get_issuer_name(x)); ASN1_INTEGER_free(is->serial); is->serial = ASN1_INTEGER_dup(X509_get_serialNumber(x)); if (is->serial == NULL) goto oom; len = i2d_PKCS7_ISSUER_AND_SERIAL(is, NULL); p = malloc(len); if (p == NULL) goto oom; krb5_cas[i]->issuerAndSerialNumber.data = (char *)p; i2d_PKCS7_ISSUER_AND_SERIAL(is, &p); krb5_cas[i]->issuerAndSerialNumber.length = len; /* fill-in subjectKeyIdentifier */ krb5_cas[i]->subjectKeyIdentifier.length = 0; krb5_cas[i]->subjectKeyIdentifier.magic = 0; krb5_cas[i]->subjectKeyIdentifier.data = NULL; if (X509_get_ext_by_NID(x, NID_subject_key_identifier, -1) >= 0) { ASN1_OCTET_STRING *ikeyid; ikeyid = X509_get_ext_d2i(x, NID_subject_key_identifier, NULL, NULL); if (ikeyid != NULL) { len = i2d_ASN1_OCTET_STRING(ikeyid, NULL); p = malloc(len); if (p == NULL) goto oom; krb5_cas[i]->subjectKeyIdentifier.data = (char *)p; i2d_ASN1_OCTET_STRING(ikeyid, &p); krb5_cas[i]->subjectKeyIdentifier.length = len; ASN1_OCTET_STRING_free(ikeyid); } } PKCS7_ISSUER_AND_SERIAL_free(is); is = NULL; } *ids = krb5_cas; return 0; oom: free_krb5_external_principal_identifier(&krb5_cas); PKCS7_ISSUER_AND_SERIAL_free(is); return ENOMEM; } static krb5_error_code create_krb5_invalidCertificates(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, krb5_external_principal_identifier *** ids) { krb5_error_code retval = ENOMEM; STACK_OF(X509) *sk = NULL; *ids = NULL; if (req_cryptoctx->received_cert == NULL) return KRB5KDC_ERR_PREAUTH_FAILED; sk = sk_X509_new_null(); if (sk == NULL) goto cleanup; sk_X509_push(sk, req_cryptoctx->received_cert); retval = create_identifiers_from_stack(sk, ids); sk_X509_free(sk); cleanup: return retval; } krb5_error_code create_krb5_supportedCMSTypes(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, krb5_algorithm_identifier ***oids) { krb5_error_code retval = ENOMEM; krb5_algorithm_identifier **loids = NULL; krb5_data des3oid = {0, 8, "\x2A\x86\x48\x86\xF7\x0D\x03\x07" }; *oids = NULL; loids = malloc(2 * sizeof(krb5_algorithm_identifier *)); if (loids == NULL) goto cleanup; loids[1] = NULL; loids[0] = malloc(sizeof(krb5_algorithm_identifier)); if (loids[0] == NULL) { free(loids); goto cleanup; } retval = pkinit_copy_krb5_data(&loids[0]->algorithm, &des3oid); if (retval) { free(loids[0]); free(loids); goto cleanup; } loids[0]->parameters.length = 0; loids[0]->parameters.data = NULL; *oids = loids; retval = 0; cleanup: return retval; } krb5_error_code create_krb5_trustedCertifiers(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, krb5_external_principal_identifier *** ids) { krb5_error_code retval = ENOMEM; STACK_OF(X509) *sk = id_cryptoctx->trustedCAs; *ids = NULL; if (id_cryptoctx->trustedCAs == NULL) return KRB5KDC_ERR_PREAUTH_FAILED; retval = create_identifiers_from_stack(sk, ids); return retval; } krb5_error_code create_issuerAndSerial(krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, unsigned char **out, unsigned int *out_len) { unsigned char *p = NULL; PKCS7_ISSUER_AND_SERIAL *is = NULL; int len = 0; krb5_error_code retval = ENOMEM; X509 *cert = req_cryptoctx->received_cert; *out = NULL; *out_len = 0; if (req_cryptoctx->received_cert == NULL) return 0; is = PKCS7_ISSUER_AND_SERIAL_new(); X509_NAME_set(&is->issuer, X509_get_issuer_name(cert)); ASN1_INTEGER_free(is->serial); is->serial = ASN1_INTEGER_dup(X509_get_serialNumber(cert)); len = i2d_PKCS7_ISSUER_AND_SERIAL(is, NULL); if ((p = *out = malloc((size_t) len)) == NULL) goto cleanup; i2d_PKCS7_ISSUER_AND_SERIAL(is, &p); *out_len = len; retval = 0; cleanup: X509_NAME_free(is->issuer); ASN1_INTEGER_free(is->serial); free(is); return retval; } krb5_error_code pkinit_process_td_trusted_certifiers( krb5_context context, pkinit_plg_crypto_context plg_cryptoctx, pkinit_req_crypto_context req_cryptoctx, pkinit_identity_crypto_context id_cryptoctx, krb5_external_principal_identifier **krb5_trusted_certifiers, int td_type) { krb5_error_code retval = ENOMEM; STACK_OF(X509_NAME) *sk_xn = NULL; X509_NAME *xn = NULL; PKCS7_ISSUER_AND_SERIAL *is = NULL; ASN1_OCTET_STRING *id = NULL; const unsigned char *p = NULL; char buf[DN_BUF_LEN]; int i = 0; if (td_type == TD_TRUSTED_CERTIFIERS) pkiDebug("received trusted certifiers\n"); else pkiDebug("received invalid certificate\n"); sk_xn = sk_X509_NAME_new_null(); while(krb5_trusted_certifiers[i] != NULL) { if (krb5_trusted_certifiers[i]->subjectName.data != NULL) { p = (unsigned char *)krb5_trusted_certifiers[i]->subjectName.data; xn = d2i_X509_NAME(NULL, &p, (int)krb5_trusted_certifiers[i]->subjectName.length); if (xn == NULL) goto cleanup; X509_NAME_oneline(xn, buf, sizeof(buf)); if (td_type == TD_TRUSTED_CERTIFIERS) pkiDebug("#%d cert = %s is trusted by kdc\n", i, buf); else pkiDebug("#%d cert = %s is invalid\n", i, buf); sk_X509_NAME_push(sk_xn, xn); } if (krb5_trusted_certifiers[i]->issuerAndSerialNumber.data != NULL) { p = (unsigned char *) krb5_trusted_certifiers[i]->issuerAndSerialNumber.data; is = d2i_PKCS7_ISSUER_AND_SERIAL(NULL, &p, (int)krb5_trusted_certifiers[i]->issuerAndSerialNumber.length); if (is == NULL) goto cleanup; X509_NAME_oneline(is->issuer, buf, sizeof(buf)); if (td_type == TD_TRUSTED_CERTIFIERS) pkiDebug("#%d issuer = %s serial = %ld is trusted bu kdc\n", i, buf, ASN1_INTEGER_get(is->serial)); else pkiDebug("#%d issuer = %s serial = %ld is invalid\n", i, buf, ASN1_INTEGER_get(is->serial)); PKCS7_ISSUER_AND_SERIAL_free(is); } if (krb5_trusted_certifiers[i]->subjectKeyIdentifier.data != NULL) { p = (unsigned char *) krb5_trusted_certifiers[i]->subjectKeyIdentifier.data; id = d2i_ASN1_OCTET_STRING(NULL, &p, (int)krb5_trusted_certifiers[i]->subjectKeyIdentifier.length); if (id == NULL) goto cleanup; /* XXX */ ASN1_OCTET_STRING_free(id); } i++; } /* XXX Since we not doing anything with received trusted certifiers * return an error. this is the place where we can pick a different * client certificate based on the information in td_trusted_certifiers */ retval = KRB5KDC_ERR_PREAUTH_FAILED; cleanup: if (sk_xn != NULL) sk_X509_NAME_pop_free(sk_xn, X509_NAME_free); return retval; } /* Originally based on OpenSSL's PKCS7_dataDecode(), now modified to remove the * use of BIO objects and to fit the PKINIT internal interfaces. */ static int pkcs7_decrypt(krb5_context context, pkinit_identity_crypto_context id_cryptoctx, PKCS7 *p7, unsigned char **data_out, unsigned int *len_out) { krb5_error_code ret; int ok = 0, plaintext_len = 0, final_len; unsigned int keylen = 0, eklen = 0, blocksize; unsigned char *ek = NULL, *tkey = NULL, *plaintext = NULL, *use_key; ASN1_OCTET_STRING *data_body = p7->d.enveloped->enc_data->enc_data; const EVP_CIPHER *evp_cipher; EVP_CIPHER_CTX *evp_ctx = NULL; X509_ALGOR *enc_alg = p7->d.enveloped->enc_data->algorithm; STACK_OF(PKCS7_RECIP_INFO) *rsk = p7->d.enveloped->recipientinfo; PKCS7_RECIP_INFO *ri = NULL; *data_out = NULL; *len_out = 0; p7->state = PKCS7_S_HEADER; /* RFC 4556 section 3.2.3.2 requires that there be exactly one * recipientInfo. */ if (sk_PKCS7_RECIP_INFO_num(rsk) != 1) { pkiDebug("invalid number of EnvelopedData RecipientInfos\n"); return 0; } ri = sk_PKCS7_RECIP_INFO_value(rsk, 0); evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm); if (evp_cipher == NULL) goto cleanup; keylen = EVP_CIPHER_key_length(evp_cipher); blocksize = EVP_CIPHER_block_size(evp_cipher); evp_ctx = EVP_CIPHER_CTX_new(); if (evp_ctx == NULL) goto cleanup; if (!EVP_DecryptInit(evp_ctx, evp_cipher, NULL, NULL) || EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) <= 0) goto cleanup; /* Generate a random symmetric key to avoid exposing timing data if RSA * decryption fails the padding check. */ tkey = malloc(keylen); if (tkey == NULL || !EVP_CIPHER_CTX_rand_key(evp_ctx, tkey)) goto cleanup; /* Decrypt the secret key with the private key. */ ret = pkinit_decode_data(context, id_cryptoctx, ASN1_STRING_get0_data(ri->enc_key), ASN1_STRING_length(ri->enc_key), &ek, &eklen); use_key = (ret || eklen != keylen) ? tkey : ek; /* Allocate a plaintext buffer and decrypt data_body into it. */ plaintext = malloc(data_body->length + blocksize); if (plaintext == NULL) goto cleanup; if (!EVP_DecryptInit(evp_ctx, NULL, use_key, NULL)) goto cleanup; if (!EVP_DecryptUpdate(evp_ctx, plaintext, &plaintext_len, data_body->data, data_body->length)) goto cleanup; if (!EVP_DecryptFinal(evp_ctx, plaintext + plaintext_len, &final_len)) goto cleanup; plaintext_len += final_len; *len_out = plaintext_len; *data_out = plaintext; plaintext = NULL; ok = 1; cleanup: EVP_CIPHER_CTX_free(evp_ctx); zapfree(plaintext, plaintext_len); zapfree(ek, eklen); zapfree(tkey, keylen); return ok; } #ifdef DEBUG_DH static void print_dh(DH * dh, char *msg) { BIO *bio_err = NULL; bio_err = BIO_new(BIO_s_file()); BIO_set_fp(bio_err, stderr, BIO_NOCLOSE | BIO_FP_TEXT); if (msg) BIO_puts(bio_err, (const char *)msg); if (dh) DHparams_print(bio_err, dh); BIO_puts(bio_err, "private key: "); BN_print(bio_err, dh->priv_key); BIO_puts(bio_err, (const char *)"\n"); BIO_free(bio_err); } static void print_pubkey(BIGNUM * key, char *msg) { BIO *bio_err = NULL; bio_err = BIO_new(BIO_s_file()); BIO_set_fp(bio_err, stderr, BIO_NOCLOSE | BIO_FP_TEXT); if (msg) BIO_puts(bio_err, (const char *)msg); if (key) BN_print(bio_err, key); BIO_puts(bio_err, "\n"); BIO_free(bio_err); } #endif static const char * pkcs11err(int err) { int i; for (i = 0; pkcs11_errstrings[i].text != NULL; i++) if (pkcs11_errstrings[i].code == err) break; if (pkcs11_errstrings[i].text != NULL) return (pkcs11_errstrings[i].text); return "unknown PKCS11 error"; } /* * Add an item to the pkinit_identity_crypto_context's list of deferred * identities. */ krb5_error_code crypto_set_deferred_id(krb5_context context, pkinit_identity_crypto_context id_cryptoctx, const char *identity, const char *password) { unsigned long ck_flags; ck_flags = pkinit_get_deferred_id_flags(id_cryptoctx->deferred_ids, identity); return pkinit_set_deferred_id(&id_cryptoctx->deferred_ids, identity, ck_flags, password); } /* * Retrieve a read-only copy of the pkinit_identity_crypto_context's list of * deferred identities, sure to be valid only until the next time someone calls * either pkinit_set_deferred_id() or crypto_set_deferred_id(). */ const pkinit_deferred_id * crypto_get_deferred_ids(krb5_context context, pkinit_identity_crypto_context id_cryptoctx) { pkinit_deferred_id *deferred; const pkinit_deferred_id *ret; deferred = id_cryptoctx->deferred_ids; ret = (const pkinit_deferred_id *)deferred; return ret; } /* Return the received certificate as DER-encoded data. */ krb5_error_code crypto_encode_der_cert(krb5_context context, pkinit_req_crypto_context reqctx, uint8_t **der_out, size_t *der_len) { int len; unsigned char *der, *p; *der_out = NULL; *der_len = 0; if (reqctx->received_cert == NULL) return EINVAL; p = NULL; len = i2d_X509(reqctx->received_cert, NULL); if (len <= 0) return EINVAL; p = der = malloc(len); if (der == NULL) return ENOMEM; if (i2d_X509(reqctx->received_cert, &p) <= 0) { free(der); return EINVAL; } *der_out = der; *der_len = len; return 0; } /* * Get the certificate matching data from the request certificate. */ krb5_error_code crypto_req_cert_matching_data(krb5_context context, pkinit_plg_crypto_context plgctx, pkinit_req_crypto_context reqctx, pkinit_cert_matching_data **md_out) { *md_out = NULL; if (reqctx == NULL || reqctx->received_cert == NULL) return ENOENT; return get_matching_data(context, plgctx, reqctx, reqctx->received_cert, md_out); }