/* * Copyright 2020-2022 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the Apache License 2.0 (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ /* This file has quite some overlap with engines/e_loader_attic.c */ #include #include #include /* isdigit */ #include #include #include #include #include #include #include #include #include #include /* The OSSL_STORE_INFO type numbers */ #include "internal/cryptlib.h" #include "internal/o_dir.h" #include "crypto/decoder.h" #include "crypto/ctype.h" /* ossl_isdigit() */ #include "prov/implementations.h" #include "prov/bio.h" #include "file_store_local.h" DEFINE_STACK_OF(OSSL_STORE_INFO) #ifdef _WIN32 # define stat _stat #endif #ifndef S_ISDIR # define S_ISDIR(a) (((a) & S_IFMT) == S_IFDIR) #endif static OSSL_FUNC_store_open_fn file_open; static OSSL_FUNC_store_attach_fn file_attach; static OSSL_FUNC_store_settable_ctx_params_fn file_settable_ctx_params; static OSSL_FUNC_store_set_ctx_params_fn file_set_ctx_params; static OSSL_FUNC_store_load_fn file_load; static OSSL_FUNC_store_eof_fn file_eof; static OSSL_FUNC_store_close_fn file_close; /* * This implementation makes full use of OSSL_DECODER, and then some. * It uses its own internal decoder implementation that reads DER and * passes that on to the data callback; this decoder is created with * internal OpenSSL functions, thereby bypassing the need for a surrounding * provider. This is ok, since this is a local decoder, not meant for * public consumption. It also uses the libcrypto internal decoder * setup function ossl_decoder_ctx_setup_for_pkey(), to allow the * last resort decoder to be added first (and thereby be executed last). * Finally, it sets up its own construct and cleanup functions. * * Essentially, that makes this implementation a kind of glorified decoder. */ struct file_ctx_st { void *provctx; char *uri; /* The URI we currently try to load */ enum { IS_FILE = 0, /* Read file and pass results */ IS_DIR /* Pass directory entry names */ } type; union { /* Used with |IS_FILE| */ struct { BIO *file; OSSL_DECODER_CTX *decoderctx; char *input_type; char *propq; /* The properties we got as a parameter */ } file; /* Used with |IS_DIR| */ struct { OPENSSL_DIR_CTX *ctx; int end_reached; /* * When a search expression is given, these are filled in. * |search_name| contains the file basename to look for. * The string is exactly 8 characters long. */ char search_name[9]; /* * The directory reading utility we have combines opening with * reading the first name. To make sure we can detect the end * at the right time, we read early and cache the name. */ const char *last_entry; int last_errno; } dir; } _; /* Expected object type. May be unspecified */ int expected_type; }; static void free_file_ctx(struct file_ctx_st *ctx) { if (ctx == NULL) return; OPENSSL_free(ctx->uri); if (ctx->type != IS_DIR) { OSSL_DECODER_CTX_free(ctx->_.file.decoderctx); OPENSSL_free(ctx->_.file.propq); OPENSSL_free(ctx->_.file.input_type); } OPENSSL_free(ctx); } static struct file_ctx_st *new_file_ctx(int type, const char *uri, void *provctx) { struct file_ctx_st *ctx = NULL; if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) != NULL && (uri == NULL || (ctx->uri = OPENSSL_strdup(uri)) != NULL)) { ctx->type = type; ctx->provctx = provctx; return ctx; } free_file_ctx(ctx); return NULL; } static OSSL_DECODER_CONSTRUCT file_load_construct; static OSSL_DECODER_CLEANUP file_load_cleanup; /*- * Opening / attaching streams and directories * ------------------------------------------- */ /* * Function to service both file_open() and file_attach() * * */ static struct file_ctx_st *file_open_stream(BIO *source, const char *uri, void *provctx) { struct file_ctx_st *ctx; if ((ctx = new_file_ctx(IS_FILE, uri, provctx)) == NULL) { ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE); goto err; } ctx->_.file.file = source; return ctx; err: free_file_ctx(ctx); return NULL; } static void *file_open_dir(const char *path, const char *uri, void *provctx) { struct file_ctx_st *ctx; if ((ctx = new_file_ctx(IS_DIR, uri, provctx)) == NULL) { ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE); return NULL; } ctx->_.dir.last_entry = OPENSSL_DIR_read(&ctx->_.dir.ctx, path); ctx->_.dir.last_errno = errno; if (ctx->_.dir.last_entry == NULL) { if (ctx->_.dir.last_errno != 0) { ERR_raise_data(ERR_LIB_SYS, ctx->_.dir.last_errno, "Calling OPENSSL_DIR_read(\"%s\")", path); goto err; } ctx->_.dir.end_reached = 1; } return ctx; err: file_close(ctx); return NULL; } static void *file_open(void *provctx, const char *uri) { struct file_ctx_st *ctx = NULL; struct stat st; struct { const char *path; unsigned int check_absolute:1; } path_data[2]; size_t path_data_n = 0, i; const char *path; BIO *bio; ERR_set_mark(); /* * First step, just take the URI as is. */ path_data[path_data_n].check_absolute = 0; path_data[path_data_n++].path = uri; /* * Second step, if the URI appears to start with the 'file' scheme, * extract the path and make that the second path to check. * There's a special case if the URI also contains an authority, then * the full URI shouldn't be used as a path anywhere. */ if (OPENSSL_strncasecmp(uri, "file:", 5) == 0) { const char *p = &uri[5]; if (strncmp(&uri[5], "//", 2) == 0) { path_data_n--; /* Invalidate using the full URI */ if (OPENSSL_strncasecmp(&uri[7], "localhost/", 10) == 0) { p = &uri[16]; } else if (uri[7] == '/') { p = &uri[7]; } else { ERR_clear_last_mark(); ERR_raise(ERR_LIB_PROV, PROV_R_URI_AUTHORITY_UNSUPPORTED); return NULL; } } path_data[path_data_n].check_absolute = 1; #ifdef _WIN32 /* Windows file: URIs with a drive letter start with a / */ if (p[0] == '/' && p[2] == ':' && p[3] == '/') { char c = tolower(p[1]); if (c >= 'a' && c <= 'z') { p++; /* We know it's absolute, so no need to check */ path_data[path_data_n].check_absolute = 0; } } #endif path_data[path_data_n++].path = p; } for (i = 0, path = NULL; path == NULL && i < path_data_n; i++) { /* * If the scheme "file" was an explicit part of the URI, the path must * be absolute. So says RFC 8089 */ if (path_data[i].check_absolute && path_data[i].path[0] != '/') { ERR_clear_last_mark(); ERR_raise_data(ERR_LIB_PROV, PROV_R_PATH_MUST_BE_ABSOLUTE, "Given path=%s", path_data[i].path); return NULL; } if (stat(path_data[i].path, &st) < 0) { ERR_raise_data(ERR_LIB_SYS, errno, "calling stat(%s)", path_data[i].path); } else { path = path_data[i].path; } } if (path == NULL) { ERR_clear_last_mark(); return NULL; } /* Successfully found a working path, clear possible collected errors */ ERR_pop_to_mark(); if (S_ISDIR(st.st_mode)) ctx = file_open_dir(path, uri, provctx); else if ((bio = BIO_new_file(path, "rb")) == NULL || (ctx = file_open_stream(bio, uri, provctx)) == NULL) BIO_free_all(bio); return ctx; } void *file_attach(void *provctx, OSSL_CORE_BIO *cin) { struct file_ctx_st *ctx; BIO *new_bio = ossl_bio_new_from_core_bio(provctx, cin); if (new_bio == NULL) return NULL; ctx = file_open_stream(new_bio, NULL, provctx); if (ctx == NULL) BIO_free(new_bio); return ctx; } /*- * Setting parameters * ------------------ */ static const OSSL_PARAM *file_settable_ctx_params(void *provctx) { static const OSSL_PARAM known_settable_ctx_params[] = { OSSL_PARAM_utf8_string(OSSL_STORE_PARAM_PROPERTIES, NULL, 0), OSSL_PARAM_int(OSSL_STORE_PARAM_EXPECT, NULL), OSSL_PARAM_octet_string(OSSL_STORE_PARAM_SUBJECT, NULL, 0), OSSL_PARAM_utf8_string(OSSL_STORE_PARAM_INPUT_TYPE, NULL, 0), OSSL_PARAM_END }; return known_settable_ctx_params; } static int file_set_ctx_params(void *loaderctx, const OSSL_PARAM params[]) { struct file_ctx_st *ctx = loaderctx; const OSSL_PARAM *p; if (params == NULL) return 1; if (ctx->type != IS_DIR) { /* these parameters are ignored for directories */ p = OSSL_PARAM_locate_const(params, OSSL_STORE_PARAM_PROPERTIES); if (p != NULL) { OPENSSL_free(ctx->_.file.propq); ctx->_.file.propq = NULL; if (!OSSL_PARAM_get_utf8_string(p, &ctx->_.file.propq, 0)) return 0; } p = OSSL_PARAM_locate_const(params, OSSL_STORE_PARAM_INPUT_TYPE); if (p != NULL) { OPENSSL_free(ctx->_.file.input_type); ctx->_.file.input_type = NULL; if (!OSSL_PARAM_get_utf8_string(p, &ctx->_.file.input_type, 0)) return 0; } } p = OSSL_PARAM_locate_const(params, OSSL_STORE_PARAM_EXPECT); if (p != NULL && !OSSL_PARAM_get_int(p, &ctx->expected_type)) return 0; p = OSSL_PARAM_locate_const(params, OSSL_STORE_PARAM_SUBJECT); if (p != NULL) { const unsigned char *der = NULL; size_t der_len = 0; X509_NAME *x509_name; unsigned long hash; int ok; if (ctx->type != IS_DIR) { ERR_raise(ERR_LIB_PROV, PROV_R_SEARCH_ONLY_SUPPORTED_FOR_DIRECTORIES); return 0; } if (!OSSL_PARAM_get_octet_string_ptr(p, (const void **)&der, &der_len) || (x509_name = d2i_X509_NAME(NULL, &der, der_len)) == NULL) return 0; hash = X509_NAME_hash_ex(x509_name, ossl_prov_ctx_get0_libctx(ctx->provctx), NULL, &ok); BIO_snprintf(ctx->_.dir.search_name, sizeof(ctx->_.dir.search_name), "%08lx", hash); X509_NAME_free(x509_name); if (ok == 0) return 0; } return 1; } /*- * Loading an object from a stream * ------------------------------- */ struct file_load_data_st { OSSL_CALLBACK *object_cb; void *object_cbarg; }; static int file_load_construct(OSSL_DECODER_INSTANCE *decoder_inst, const OSSL_PARAM *params, void *construct_data) { struct file_load_data_st *data = construct_data; /* * At some point, we may find it justifiable to recognise PKCS#12 and * handle it specially here, making |file_load()| return pass its * contents one piece at ta time, like |e_loader_attic.c| does. * * However, that currently means parsing them out, which converts the * DER encoded PKCS#12 into a bunch of EVP_PKEYs and X509s, just to * have to re-encode them into DER to create an object abstraction for * each of them. * It's much simpler (less churn) to pass on the object abstraction we * get to the load_result callback and leave it to that one to do the * work. If that's libcrypto code, we know that it has much better * possibilities to handle the EVP_PKEYs and X509s without the extra * churn. */ return data->object_cb(params, data->object_cbarg); } void file_load_cleanup(void *construct_data) { /* Nothing to do */ } static int file_setup_decoders(struct file_ctx_st *ctx) { OSSL_LIB_CTX *libctx = ossl_prov_ctx_get0_libctx(ctx->provctx); const OSSL_ALGORITHM *to_algo = NULL; int ok = 0; /* Setup for this session, so only if not already done */ if (ctx->_.file.decoderctx == NULL) { if ((ctx->_.file.decoderctx = OSSL_DECODER_CTX_new()) == NULL) { ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE); goto err; } /* Make sure the input type is set */ if (!OSSL_DECODER_CTX_set_input_type(ctx->_.file.decoderctx, ctx->_.file.input_type)) { ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB); goto err; } /* * Where applicable, set the outermost structure name. * The goal is to avoid the STORE object types that are * potentially password protected but aren't interesting * for this load. */ switch (ctx->expected_type) { case OSSL_STORE_INFO_CERT: if (!OSSL_DECODER_CTX_set_input_structure(ctx->_.file.decoderctx, "Certificate")) { ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB); goto err; } break; case OSSL_STORE_INFO_CRL: if (!OSSL_DECODER_CTX_set_input_structure(ctx->_.file.decoderctx, "CertificateList")) { ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB); goto err; } break; default: break; } for (to_algo = ossl_any_to_obj_algorithm; to_algo->algorithm_names != NULL; to_algo++) { OSSL_DECODER *to_obj = NULL; OSSL_DECODER_INSTANCE *to_obj_inst = NULL; /* * Create the internal last resort decoder implementation * together with a "decoder instance". * The decoder doesn't need any identification or to be * attached to any provider, since it's only used locally. */ to_obj = ossl_decoder_from_algorithm(0, to_algo, NULL); if (to_obj != NULL) to_obj_inst = ossl_decoder_instance_new(to_obj, ctx->provctx); OSSL_DECODER_free(to_obj); if (to_obj_inst == NULL) goto err; if (!ossl_decoder_ctx_add_decoder_inst(ctx->_.file.decoderctx, to_obj_inst)) { ossl_decoder_instance_free(to_obj_inst); ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB); goto err; } } /* Add on the usual extra decoders */ if (!OSSL_DECODER_CTX_add_extra(ctx->_.file.decoderctx, libctx, ctx->_.file.propq)) { ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB); goto err; } /* * Then install our constructor hooks, which just passes decoded * data to the load callback */ if (!OSSL_DECODER_CTX_set_construct(ctx->_.file.decoderctx, file_load_construct) || !OSSL_DECODER_CTX_set_cleanup(ctx->_.file.decoderctx, file_load_cleanup)) { ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB); goto err; } } ok = 1; err: return ok; } static int file_load_file(struct file_ctx_st *ctx, OSSL_CALLBACK *object_cb, void *object_cbarg, OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg) { struct file_load_data_st data; int ret, err; /* Setup the decoders (one time shot per session */ if (!file_setup_decoders(ctx)) return 0; /* Setup for this object */ data.object_cb = object_cb; data.object_cbarg = object_cbarg; OSSL_DECODER_CTX_set_construct_data(ctx->_.file.decoderctx, &data); OSSL_DECODER_CTX_set_passphrase_cb(ctx->_.file.decoderctx, pw_cb, pw_cbarg); /* Launch */ ERR_set_mark(); ret = OSSL_DECODER_from_bio(ctx->_.file.decoderctx, ctx->_.file.file); if (BIO_eof(ctx->_.file.file) && ((err = ERR_peek_last_error()) != 0) && ERR_GET_LIB(err) == ERR_LIB_OSSL_DECODER && ERR_GET_REASON(err) == ERR_R_UNSUPPORTED) ERR_pop_to_mark(); else ERR_clear_last_mark(); return ret; } /*- * Loading a name object from a directory * -------------------------------------- */ static char *file_name_to_uri(struct file_ctx_st *ctx, const char *name) { char *data = NULL; assert(name != NULL); { const char *pathsep = ossl_ends_with_dirsep(ctx->uri) ? "" : "/"; long calculated_length = strlen(ctx->uri) + strlen(pathsep) + strlen(name) + 1 /* \0 */; data = OPENSSL_zalloc(calculated_length); if (data == NULL) { ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE); return NULL; } OPENSSL_strlcat(data, ctx->uri, calculated_length); OPENSSL_strlcat(data, pathsep, calculated_length); OPENSSL_strlcat(data, name, calculated_length); } return data; } static int file_name_check(struct file_ctx_st *ctx, const char *name) { const char *p = NULL; size_t len = strlen(ctx->_.dir.search_name); /* If there are no search criteria, all names are accepted */ if (ctx->_.dir.search_name[0] == '\0') return 1; /* If the expected type isn't supported, no name is accepted */ if (ctx->expected_type != 0 && ctx->expected_type != OSSL_STORE_INFO_CERT && ctx->expected_type != OSSL_STORE_INFO_CRL) return 0; /* * First, check the basename */ if (OPENSSL_strncasecmp(name, ctx->_.dir.search_name, len) != 0 || name[len] != '.') return 0; p = &name[len + 1]; /* * Then, if the expected type is a CRL, check that the extension starts * with 'r' */ if (*p == 'r') { p++; if (ctx->expected_type != 0 && ctx->expected_type != OSSL_STORE_INFO_CRL) return 0; } else if (ctx->expected_type == OSSL_STORE_INFO_CRL) { return 0; } /* * Last, check that the rest of the extension is a decimal number, at * least one digit long. */ if (!isdigit(*p)) return 0; while (isdigit(*p)) p++; #ifdef __VMS /* * One extra step here, check for a possible generation number. */ if (*p == ';') for (p++; *p != '\0'; p++) if (!ossl_isdigit(*p)) break; #endif /* * If we've reached the end of the string at this point, we've successfully * found a fitting file name. */ return *p == '\0'; } static int file_load_dir_entry(struct file_ctx_st *ctx, OSSL_CALLBACK *object_cb, void *object_cbarg, OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg) { /* Prepare as much as possible in advance */ static const int object_type = OSSL_OBJECT_NAME; OSSL_PARAM object[] = { OSSL_PARAM_int(OSSL_OBJECT_PARAM_TYPE, (int *)&object_type), OSSL_PARAM_utf8_string(OSSL_OBJECT_PARAM_DATA, NULL, 0), OSSL_PARAM_END }; char *newname = NULL; int ok; /* Loop until we get an error or until we have a suitable name */ do { if (ctx->_.dir.last_entry == NULL) { if (!ctx->_.dir.end_reached) { assert(ctx->_.dir.last_errno != 0); ERR_raise(ERR_LIB_SYS, ctx->_.dir.last_errno); } /* file_eof() will tell if EOF was reached */ return 0; } /* flag acceptable names */ if (ctx->_.dir.last_entry[0] != '.' && file_name_check(ctx, ctx->_.dir.last_entry)) { /* If we can't allocate the new name, we fail */ if ((newname = file_name_to_uri(ctx, ctx->_.dir.last_entry)) == NULL) return 0; } /* * On the first call (with a NULL context), OPENSSL_DIR_read() * cares about the second argument. On the following calls, it * only cares that it isn't NULL. Therefore, we can safely give * it our URI here. */ ctx->_.dir.last_entry = OPENSSL_DIR_read(&ctx->_.dir.ctx, ctx->uri); ctx->_.dir.last_errno = errno; if (ctx->_.dir.last_entry == NULL && ctx->_.dir.last_errno == 0) ctx->_.dir.end_reached = 1; } while (newname == NULL); object[1].data = newname; object[1].data_size = strlen(newname); ok = object_cb(object, object_cbarg); OPENSSL_free(newname); return ok; } /*- * Loading, local dispatcher * ------------------------- */ static int file_load(void *loaderctx, OSSL_CALLBACK *object_cb, void *object_cbarg, OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg) { struct file_ctx_st *ctx = loaderctx; switch (ctx->type) { case IS_FILE: return file_load_file(ctx, object_cb, object_cbarg, pw_cb, pw_cbarg); case IS_DIR: return file_load_dir_entry(ctx, object_cb, object_cbarg, pw_cb, pw_cbarg); default: break; } /* ctx->type has an unexpected value */ assert(0); return 0; } /*- * Eof detection and closing * ------------------------- */ static int file_eof(void *loaderctx) { struct file_ctx_st *ctx = loaderctx; switch (ctx->type) { case IS_DIR: return ctx->_.dir.end_reached; case IS_FILE: /* * BIO_pending() checks any filter BIO. * BIO_eof() checks the source BIO. */ return !BIO_pending(ctx->_.file.file) && BIO_eof(ctx->_.file.file); } /* ctx->type has an unexpected value */ assert(0); return 1; } static int file_close_dir(struct file_ctx_st *ctx) { if (ctx->_.dir.ctx != NULL) OPENSSL_DIR_end(&ctx->_.dir.ctx); free_file_ctx(ctx); return 1; } static int file_close_stream(struct file_ctx_st *ctx) { /* * This frees either the provider BIO filter (for file_attach()) OR * the allocated file BIO (for file_open()). */ BIO_free(ctx->_.file.file); ctx->_.file.file = NULL; free_file_ctx(ctx); return 1; } static int file_close(void *loaderctx) { struct file_ctx_st *ctx = loaderctx; switch (ctx->type) { case IS_DIR: return file_close_dir(ctx); case IS_FILE: return file_close_stream(ctx); } /* ctx->type has an unexpected value */ assert(0); return 1; } const OSSL_DISPATCH ossl_file_store_functions[] = { { OSSL_FUNC_STORE_OPEN, (void (*)(void))file_open }, { OSSL_FUNC_STORE_ATTACH, (void (*)(void))file_attach }, { OSSL_FUNC_STORE_SETTABLE_CTX_PARAMS, (void (*)(void))file_settable_ctx_params }, { OSSL_FUNC_STORE_SET_CTX_PARAMS, (void (*)(void))file_set_ctx_params }, { OSSL_FUNC_STORE_LOAD, (void (*)(void))file_load }, { OSSL_FUNC_STORE_EOF, (void (*)(void))file_eof }, { OSSL_FUNC_STORE_CLOSE, (void (*)(void))file_close }, { 0, NULL }, };