1 /* $NetBSD: auth_unix.c,v 1.18 2000/07/06 03:03:30 christos Exp $ */
4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5 * unrestricted use provided that this legend is included on all tape
6 * media and as a part of the software program in whole or part. Users
7 * may copy or modify Sun RPC without charge, but are not authorized
8 * to license or distribute it to anyone else except as part of a product or
9 * program developed by the user.
11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
15 * Sun RPC is provided with no support and without any obligation on the
16 * part of Sun Microsystems, Inc. to assist in its use, correction,
17 * modification or enhancement.
19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21 * OR ANY PART THEREOF.
23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24 * or profits or other special, indirect and consequential damages, even if
25 * Sun has been advised of the possibility of such damages.
27 * Sun Microsystems, Inc.
29 * Mountain View, California 94043
32 #if defined(LIBC_SCCS) && !defined(lint)
33 static char *sccsid2 = "@(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro";
34 static char *sccsid = "@(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC";
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
40 * auth_unix.c, Implements UNIX style authentication parameters.
42 * Copyright (C) 1984, Sun Microsystems, Inc.
44 * The system is very weak. The client uses no encryption for it's
45 * credentials and only sends null verifiers. The server sends backs
46 * null verifiers or optionally a verifier that suggests a new short hand
47 * for the credentials.
51 #include "namespace.h"
52 #include "reentrant.h"
53 #include <sys/param.h>
62 #include <rpc/types.h>
65 #include <rpc/auth_unix.h>
66 #include "un-namespace.h"
70 static void authunix_nextverf (AUTH *);
71 static bool_t authunix_marshal (AUTH *, XDR *);
72 static bool_t authunix_validate (AUTH *, struct opaque_auth *);
73 static bool_t authunix_refresh (AUTH *, void *);
74 static void authunix_destroy (AUTH *);
75 static void marshal_new_auth (AUTH *);
76 static struct auth_ops *authunix_ops (void);
79 * This struct is pointed to by the ah_private field of an auth_handle.
82 struct opaque_auth au_origcred; /* original credentials */
83 struct opaque_auth au_shcred; /* short hand cred */
84 u_long au_shfaults; /* short hand cache faults */
85 char au_marshed[MAX_AUTH_BYTES];
86 u_int au_mpos; /* xdr pos at end of marshed */
88 #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private)
91 * Create a unix style authenticator.
92 * Returns an auth handle with the given stuff in it.
95 authunix_create(machname, uid, gid, len, aup_gids)
102 struct authunix_parms aup;
103 char mymem[MAX_AUTH_BYTES];
110 * Allocate and set up auth handle
113 auth = mem_alloc(sizeof(*auth));
116 warnx("authunix_create: out of memory");
117 goto cleanup_authunix_create;
120 au = mem_alloc(sizeof(*au));
123 warnx("authunix_create: out of memory");
124 goto cleanup_authunix_create;
127 auth->ah_ops = authunix_ops();
128 auth->ah_private = (caddr_t)au;
129 auth->ah_verf = au->au_shcred = _null_auth;
131 au->au_origcred.oa_base = NULL;
134 * fill in param struct from the given params
136 (void)gettimeofday(&now, NULL);
137 aup.aup_time = now.tv_sec;
138 aup.aup_machname = machname;
141 aup.aup_len = (u_int)len;
142 aup.aup_gids = aup_gids;
145 * Serialize the parameters into origcred
147 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE);
148 if (! xdr_authunix_parms(&xdrs, &aup))
150 au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs);
151 au->au_origcred.oa_flavor = AUTH_UNIX;
153 au->au_origcred.oa_base = mem_alloc((u_int) len);
155 if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) {
156 warnx("authunix_create: out of memory");
157 goto cleanup_authunix_create;
160 memmove(au->au_origcred.oa_base, mymem, (size_t)len);
163 * set auth handle to reflect new cred.
165 auth->ah_cred = au->au_origcred;
166 marshal_new_auth(auth);
169 cleanup_authunix_create:
171 mem_free(auth, sizeof(*auth));
173 if (au->au_origcred.oa_base)
174 mem_free(au->au_origcred.oa_base, (u_int)len);
175 mem_free(au, sizeof(*au));
182 * Returns an auth handle with parameters determined by doing lots of
186 authunix_create_default()
191 char machname[MAXHOSTNAMELEN + 1];
196 ngids_max = sysconf(_SC_NGROUPS_MAX) + 1;
197 gids = malloc(sizeof(gid_t) * ngids_max);
201 if (gethostname(machname, sizeof machname) == -1)
203 machname[sizeof(machname) - 1] = 0;
206 if ((ngids = getgroups(ngids_max, gids)) < 0)
210 /* XXX: interface problem; we should translate from uid_t and gid_t */
211 auth = authunix_create(machname, uid, gid, ngids, gids);
217 * authunix operations
222 authunix_nextverf(auth)
225 /* no action necessary */
229 authunix_marshal(auth, xdrs)
235 assert(auth != NULL);
236 assert(xdrs != NULL);
238 au = AUTH_PRIVATE(auth);
239 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos));
243 authunix_validate(auth, verf)
245 struct opaque_auth *verf;
250 assert(auth != NULL);
251 assert(verf != NULL);
253 if (verf->oa_flavor == AUTH_SHORT) {
254 au = AUTH_PRIVATE(auth);
255 xdrmem_create(&xdrs, verf->oa_base, verf->oa_length,
258 if (au->au_shcred.oa_base != NULL) {
259 mem_free(au->au_shcred.oa_base,
260 au->au_shcred.oa_length);
261 au->au_shcred.oa_base = NULL;
263 if (xdr_opaque_auth(&xdrs, &au->au_shcred)) {
264 auth->ah_cred = au->au_shcred;
266 xdrs.x_op = XDR_FREE;
267 (void)xdr_opaque_auth(&xdrs, &au->au_shcred);
268 au->au_shcred.oa_base = NULL;
269 auth->ah_cred = au->au_origcred;
271 marshal_new_auth(auth);
277 authunix_refresh(AUTH *auth, void *dummy)
279 struct audata *au = AUTH_PRIVATE(auth);
280 struct authunix_parms aup;
285 assert(auth != NULL);
287 if (auth->ah_cred.oa_base == au->au_origcred.oa_base) {
288 /* there is no hope. Punt */
293 /* first deserialize the creds back into a struct authunix_parms */
294 aup.aup_machname = NULL;
296 xdrmem_create(&xdrs, au->au_origcred.oa_base,
297 au->au_origcred.oa_length, XDR_DECODE);
298 stat = xdr_authunix_parms(&xdrs, &aup);
302 /* update the time and serialize in place */
303 (void)gettimeofday(&now, NULL);
304 aup.aup_time = now.tv_sec;
305 xdrs.x_op = XDR_ENCODE;
306 XDR_SETPOS(&xdrs, 0);
307 stat = xdr_authunix_parms(&xdrs, &aup);
310 auth->ah_cred = au->au_origcred;
311 marshal_new_auth(auth);
313 /* free the struct authunix_parms created by deserializing */
314 xdrs.x_op = XDR_FREE;
315 (void)xdr_authunix_parms(&xdrs, &aup);
321 authunix_destroy(auth)
326 assert(auth != NULL);
328 au = AUTH_PRIVATE(auth);
329 mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length);
331 if (au->au_shcred.oa_base != NULL)
332 mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length);
334 mem_free(auth->ah_private, sizeof(struct audata));
336 if (auth->ah_verf.oa_base != NULL)
337 mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length);
339 mem_free(auth, sizeof(*auth));
343 * Marshals (pre-serializes) an auth struct.
344 * sets private data, au_marshed and au_mpos
347 marshal_new_auth(auth)
351 XDR *xdrs = &xdr_stream;
354 assert(auth != NULL);
356 au = AUTH_PRIVATE(auth);
357 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE);
358 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) ||
359 (! xdr_opaque_auth(xdrs, &(auth->ah_verf))))
360 warnx("auth_none.c - Fatal marshalling problem");
362 au->au_mpos = XDR_GETPOS(xdrs);
366 static struct auth_ops *
369 static struct auth_ops ops;
371 /* VARIABLES PROTECTED BY ops_lock: ops */
373 mutex_lock(&ops_lock);
374 if (ops.ah_nextverf == NULL) {
375 ops.ah_nextverf = authunix_nextverf;
376 ops.ah_marshal = authunix_marshal;
377 ops.ah_validate = authunix_validate;
378 ops.ah_refresh = authunix_refresh;
379 ops.ah_destroy = authunix_destroy;
381 mutex_unlock(&ops_lock);