/* @(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC */ /* * Copyright (c) 2010, Oracle America, Inc. * * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * * Neither the name of the "Oracle America, Inc." nor the names of * its contributors may be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #if !defined(lint) && defined(SCCSIDS) static char sccsid[] = "@(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro"; #endif /* * auth_unix.c, Implements UNIX style authentication parameters. * * The system is very weak. The client uses no encryption for its * credentials and only sends null verifiers. The server sends backs * null verifiers or optionally a verifier that suggests a new short hand * for the credentials. * */ #include "autoconf.h" #include #include #include #include #include #include #include /* * Unix authenticator operations vector */ static void authunix_nextverf(AUTH *); static bool_t authunix_marshal(AUTH *, XDR *); static bool_t authunix_validate(AUTH *, struct opaque_auth *); static bool_t authunix_refresh(AUTH *, struct rpc_msg *); static void authunix_destroy(AUTH *); static bool_t authunix_wrap(AUTH *, XDR *, xdrproc_t, caddr_t); static struct auth_ops auth_unix_ops = { authunix_nextverf, authunix_marshal, authunix_validate, authunix_refresh, authunix_destroy, authunix_wrap, authunix_wrap }; /* * This struct is pointed to by the ah_private field of an auth_handle. */ struct audata { struct opaque_auth au_origcred; /* original credentials */ struct opaque_auth au_shcred; /* short hand cred */ uint32_t au_shfaults; /* short hand cache faults */ char au_marshed[MAX_AUTH_BYTES]; u_int au_mpos; /* xdr pos at end of marshed */ }; #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private) static void marshal_new_auth(AUTH *); /* * Create a unix style authenticator. * Returns an auth handle with the given stuff in it. */ AUTH * authunix_create( char *machname, int uid, int gid, int len, int *aup_gids) { struct authunix_parms aup; char mymem[MAX_AUTH_BYTES]; struct timeval now; XDR xdrs; AUTH *auth; struct audata *au; /* * Allocate and set up auth handle */ auth = (AUTH *)mem_alloc(sizeof(*auth)); #ifndef KERNEL if (auth == NULL) { (void)fprintf(stderr, "authunix_create: out of memory\n"); return (NULL); } #endif au = (struct audata *)mem_alloc(sizeof(*au)); #ifndef KERNEL if (au == NULL) { (void)fprintf(stderr, "authunix_create: out of memory\n"); return (NULL); } #endif auth->ah_ops = &auth_unix_ops; auth->ah_private = (caddr_t)au; auth->ah_verf = au->au_shcred = gssrpc__null_auth; au->au_shfaults = 0; /* * fill in param struct from the given params */ (void)gettimeofday(&now, (struct timezone *)0); aup.aup_time = now.tv_sec; aup.aup_machname = machname; aup.aup_uid = uid; aup.aup_gid = gid; aup.aup_len = (u_int)len; aup.aup_gids = aup_gids; /* * Serialize the parameters into origcred */ xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE); if (! xdr_authunix_parms(&xdrs, &aup)) abort(); au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs); au->au_origcred.oa_flavor = AUTH_UNIX; #ifdef KERNEL au->au_origcred.oa_base = mem_alloc((u_int) len); #else if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) { (void)fprintf(stderr, "authunix_create: out of memory\n"); return (NULL); } #endif memmove(au->au_origcred.oa_base, mymem, (u_int)len); /* * set auth handle to reflect new cred. */ auth->ah_cred = au->au_origcred; marshal_new_auth(auth); return (auth); } /* * Returns an auth handle with parameters determined by doing lots of * syscalls. */ AUTH * authunix_create_default(void) { int len; char machname[MAX_MACHINE_NAME + 1]; int uid; int gid; GETGROUPS_T gids[NGRPS]; int igids[NGRPS], i; if (gethostname(machname, MAX_MACHINE_NAME) == -1) abort(); machname[MAX_MACHINE_NAME] = 0; uid = geteuid(); gid = getegid(); if ((len = getgroups(NGRPS, gids)) < 0) abort(); for(i = 0; i < NGRPS; i++) { igids[i] = gids[i]; } return (authunix_create(machname, uid, gid, len, igids)); } /* * authunix operations */ static void authunix_nextverf(AUTH *auth) { /* no action necessary */ } static bool_t authunix_marshal(AUTH *auth, XDR *xdrs) { struct audata *au = AUTH_PRIVATE(auth); return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos)); } static bool_t authunix_validate(AUTH *auth, struct opaque_auth *verf) { struct audata *au; XDR xdrs; if (verf->oa_flavor == AUTH_SHORT) { au = AUTH_PRIVATE(auth); xdrmem_create(&xdrs, verf->oa_base, verf->oa_length, XDR_DECODE); if (au->au_shcred.oa_base != NULL) { mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length); au->au_shcred.oa_base = NULL; } if (xdr_opaque_auth(&xdrs, &au->au_shcred)) { auth->ah_cred = au->au_shcred; } else { xdrs.x_op = XDR_FREE; (void)xdr_opaque_auth(&xdrs, &au->au_shcred); au->au_shcred.oa_base = NULL; auth->ah_cred = au->au_origcred; } marshal_new_auth(auth); } return (TRUE); } static bool_t authunix_refresh(AUTH *auth, struct rpc_msg *msg) { struct audata *au = AUTH_PRIVATE(auth); struct authunix_parms aup; struct timeval now; XDR xdrs; int stat; if (auth->ah_cred.oa_base == au->au_origcred.oa_base) { /* there is no hope. Punt */ return (FALSE); } au->au_shfaults ++; /* first deserialize the creds back into a struct authunix_parms */ aup.aup_machname = NULL; aup.aup_gids = (int *)NULL; xdrmem_create(&xdrs, au->au_origcred.oa_base, au->au_origcred.oa_length, XDR_DECODE); stat = xdr_authunix_parms(&xdrs, &aup); if (! stat) goto done; /* update the time and serialize in place */ (void)gettimeofday(&now, (struct timezone *)0); aup.aup_time = now.tv_sec; xdrs.x_op = XDR_ENCODE; XDR_SETPOS(&xdrs, 0); stat = xdr_authunix_parms(&xdrs, &aup); if (! stat) goto done; auth->ah_cred = au->au_origcred; marshal_new_auth(auth); done: /* free the struct authunix_parms created by deserializing */ xdrs.x_op = XDR_FREE; (void)xdr_authunix_parms(&xdrs, &aup); XDR_DESTROY(&xdrs); return (stat); } static void authunix_destroy(AUTH *auth) { struct audata *au = AUTH_PRIVATE(auth); mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length); if (au->au_shcred.oa_base != NULL) mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length); mem_free(auth->ah_private, sizeof(struct audata)); if (auth->ah_verf.oa_base != NULL) mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length); mem_free((caddr_t)auth, sizeof(*auth)); } /* * Marshals (pre-serializes) an auth struct. * sets private data, au_marshed and au_mpos */ static void marshal_new_auth(AUTH *auth) { XDR xdr_stream; XDR *xdrs = &xdr_stream; struct audata *au = AUTH_PRIVATE(auth); xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE); if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) || (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) { perror("auth_none.c - Fatal marshalling problem"); } else { au->au_mpos = XDR_GETPOS(xdrs); } XDR_DESTROY(xdrs); } static bool_t authunix_wrap(AUTH *auth, XDR *xdrs, xdrproc_t xfunc, caddr_t xwhere) { return ((*xfunc)(xdrs, xwhere)); }