/* * Sun RPC is a product of Sun Microsystems, Inc. and is provided for * unrestricted use provided that this legend is included on all tape * media and as a part of the software program in whole or part. Users * may copy or modify Sun RPC without charge, but are not authorized * to license or distribute it to anyone else except as part of a product or * program developed by the user. * * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. * * Sun RPC is provided with no support and without any obligation on the * part of Sun Microsystems, Inc. to assist in its use, correction, * modification or enhancement. * * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC * OR ANY PART THEREOF. * * In no event will Sun Microsystems, Inc. be liable for any lost revenue * or profits or other special, indirect and consequential damages, even if * Sun has been advised of the possibility of such damages. * * Sun Microsystems, Inc. * 2550 Garcia Avenue * Mountain View, California 94043 */ /* * Copyright (C) 1984, Sun Microsystems, Inc. */ /* * auth_unix.c, Implements UNIX style authentication parameters. * * The system is very weak. The client uses no encryption for it's * 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 #include #include #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 *); static void authunix_destroy (AUTH *); static const struct auth_ops auth_unix_ops = { authunix_nextverf, authunix_marshal, authunix_validate, authunix_refresh, authunix_destroy }; /* * 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 */ u_long 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 bool_t marshal_new_auth (AUTH *) internal_function; /* * Create a unix style authenticator. * Returns an auth handle with the given stuff in it. */ AUTH * authunix_create (char *machname, uid_t uid, gid_t gid, int len, gid_t *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)); au = (struct audata *) mem_alloc (sizeof (*au)); if (auth == NULL || au == NULL) { no_memory: (void) fputs (_("authunix_create: out of memory\n"), stderr); mem_free (auth, sizeof (*auth)); mem_free (au, sizeof (*au)); return NULL; } auth->ah_ops = &auth_unix_ops; auth->ah_private = (caddr_t) au; auth->ah_verf = au->au_shcred = _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; au->au_origcred.oa_base = mem_alloc ((u_int) len); if (au->au_origcred.oa_base == NULL) goto no_memory; memcpy(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; } libc_hidden_def(authunix_create) /* * 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]; uid_t uid; gid_t gid; int max_nr_groups = sysconf (_SC_NGROUPS_MAX); gid_t *gids = NULL; AUTH *ret_auth; if (max_nr_groups) { gids = (gid_t*)malloc(sizeof(*gids) * max_nr_groups); if (gids == NULL) abort (); } if (gethostname (machname, MAX_MACHINE_NAME) == -1) abort (); machname[MAX_MACHINE_NAME] = 0; uid = geteuid (); gid = getegid (); if ((len = getgroups (max_nr_groups, gids)) < 0) abort (); /* This braindamaged Sun code forces us here to truncate the list of groups to NGRPS members since the code in authuxprot.c transforms a fixed array. Grrr. */ ret_auth = authunix_create (machname, uid, gid, MIN (NGRPS, len), gids); free (gids); return ret_auth; } libc_hidden_def(authunix_create_default) /* * authunix operations */ static void authunix_nextverf (AUTH *auth attribute_unused) { /* 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 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 = (gid_t *) 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 bool_t internal_function 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_unix.c - Fatal marshalling problem")); else au->au_mpos = XDR_GETPOS (xdrs); XDR_DESTROY (xdrs); return TRUE; }