1 /* $NetBSD: auth_unix.c,v 1.18 2000/07/06 03:03:30 christos Exp $ */
4 * Copyright (c) 2009, Sun Microsystems, Inc.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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28 * POSSIBILITY OF SUCH DAMAGE.
31 #if defined(LIBC_SCCS) && !defined(lint)
32 static char *sccsid2 = "@(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro";
33 static char *sccsid = "@(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC";
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
39 * auth_unix.c, Implements UNIX style authentication parameters.
41 * Copyright (C) 1984, Sun Microsystems, Inc.
43 * The system is very weak. The client uses no encryption for it's
44 * credentials and only sends null verifiers. The server sends backs
45 * null verifiers or optionally a verifier that suggests a new short hand
46 * for the credentials.
50 #include "namespace.h"
51 #include "reentrant.h"
52 #include <sys/param.h>
61 #include <rpc/types.h>
64 #include <rpc/auth_unix.h>
65 #include "un-namespace.h"
69 static void authunix_nextverf (AUTH *);
70 static bool_t authunix_marshal (AUTH *, XDR *);
71 static bool_t authunix_validate (AUTH *, struct opaque_auth *);
72 static bool_t authunix_refresh (AUTH *, void *);
73 static void authunix_destroy (AUTH *);
74 static void marshal_new_auth (AUTH *);
75 static struct auth_ops *authunix_ops (void);
78 * This struct is pointed to by the ah_private field of an auth_handle.
81 struct opaque_auth au_origcred; /* original credentials */
82 struct opaque_auth au_shcred; /* short hand cred */
83 u_long au_shfaults; /* short hand cache faults */
84 char au_marshed[MAX_AUTH_BYTES];
85 u_int au_mpos; /* xdr pos at end of marshed */
87 #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private)
90 * Create a unix style authenticator.
91 * Returns an auth handle with the given stuff in it.
94 authunix_create(char *machname, u_int uid, u_int gid, int len, u_int *aup_gids)
96 struct authunix_parms aup;
97 char mymem[MAX_AUTH_BYTES];
104 * Allocate and set up auth handle
107 auth = mem_alloc(sizeof(*auth));
110 warnx("authunix_create: out of memory");
111 goto cleanup_authunix_create;
114 au = mem_alloc(sizeof(*au));
117 warnx("authunix_create: out of memory");
118 goto cleanup_authunix_create;
121 auth->ah_ops = authunix_ops();
122 auth->ah_private = (caddr_t)au;
123 auth->ah_verf = au->au_shcred = _null_auth;
125 au->au_origcred.oa_base = NULL;
128 * fill in param struct from the given params
130 (void)gettimeofday(&now, NULL);
131 aup.aup_time = now.tv_sec;
132 aup.aup_machname = machname;
135 aup.aup_len = (u_int)len;
136 aup.aup_gids = aup_gids;
139 * Serialize the parameters into origcred
141 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE);
142 if (! xdr_authunix_parms(&xdrs, &aup))
144 au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs);
145 au->au_origcred.oa_flavor = AUTH_UNIX;
147 au->au_origcred.oa_base = mem_alloc((u_int) len);
149 if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) {
150 warnx("authunix_create: out of memory");
151 goto cleanup_authunix_create;
154 memmove(au->au_origcred.oa_base, mymem, (size_t)len);
157 * set auth handle to reflect new cred.
159 auth->ah_cred = au->au_origcred;
160 marshal_new_auth(auth);
163 cleanup_authunix_create:
165 mem_free(auth, sizeof(*auth));
167 if (au->au_origcred.oa_base)
168 mem_free(au->au_origcred.oa_base, (u_int)len);
169 mem_free(au, sizeof(*au));
176 * Returns an auth handle with parameters determined by doing lots of
180 authunix_create_default(void)
185 char machname[MAXHOSTNAMELEN + 1];
190 ngids_max = sysconf(_SC_NGROUPS_MAX) + 1;
191 gids = malloc(sizeof(gid_t) * ngids_max);
195 if (gethostname(machname, sizeof machname) == -1)
197 machname[sizeof(machname) - 1] = 0;
200 if ((ngids = getgroups(ngids_max, gids)) < 0)
204 /* XXX: interface problem; we should translate from uid_t and gid_t */
205 auth = authunix_create(machname, uid, gid, ngids, gids);
211 * authunix operations
216 authunix_nextverf(AUTH *auth)
218 /* no action necessary */
222 authunix_marshal(AUTH *auth, XDR *xdrs)
226 assert(auth != NULL);
227 assert(xdrs != NULL);
229 au = AUTH_PRIVATE(auth);
230 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos));
234 authunix_validate(AUTH *auth, struct opaque_auth *verf)
239 assert(auth != NULL);
240 assert(verf != NULL);
242 if (verf->oa_flavor == AUTH_SHORT) {
243 au = AUTH_PRIVATE(auth);
244 xdrmem_create(&xdrs, verf->oa_base, verf->oa_length,
247 if (au->au_shcred.oa_base != NULL) {
248 mem_free(au->au_shcred.oa_base,
249 au->au_shcred.oa_length);
250 au->au_shcred.oa_base = NULL;
252 if (xdr_opaque_auth(&xdrs, &au->au_shcred)) {
253 auth->ah_cred = au->au_shcred;
255 xdrs.x_op = XDR_FREE;
256 (void)xdr_opaque_auth(&xdrs, &au->au_shcred);
257 au->au_shcred.oa_base = NULL;
258 auth->ah_cred = au->au_origcred;
260 marshal_new_auth(auth);
266 authunix_refresh(AUTH *auth, void *dummy)
268 struct audata *au = AUTH_PRIVATE(auth);
269 struct authunix_parms aup;
274 assert(auth != NULL);
276 if (auth->ah_cred.oa_base == au->au_origcred.oa_base) {
277 /* there is no hope. Punt */
282 /* first deserialize the creds back into a struct authunix_parms */
283 aup.aup_machname = NULL;
285 xdrmem_create(&xdrs, au->au_origcred.oa_base,
286 au->au_origcred.oa_length, XDR_DECODE);
287 stat = xdr_authunix_parms(&xdrs, &aup);
291 /* update the time and serialize in place */
292 (void)gettimeofday(&now, NULL);
293 aup.aup_time = now.tv_sec;
294 xdrs.x_op = XDR_ENCODE;
295 XDR_SETPOS(&xdrs, 0);
296 stat = xdr_authunix_parms(&xdrs, &aup);
299 auth->ah_cred = au->au_origcred;
300 marshal_new_auth(auth);
302 /* free the struct authunix_parms created by deserializing */
303 xdrs.x_op = XDR_FREE;
304 (void)xdr_authunix_parms(&xdrs, &aup);
310 authunix_destroy(AUTH *auth)
314 assert(auth != NULL);
316 au = AUTH_PRIVATE(auth);
317 mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length);
319 if (au->au_shcred.oa_base != NULL)
320 mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length);
322 mem_free(auth->ah_private, sizeof(struct audata));
324 if (auth->ah_verf.oa_base != NULL)
325 mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length);
327 mem_free(auth, sizeof(*auth));
331 * Marshals (pre-serializes) an auth struct.
332 * sets private data, au_marshed and au_mpos
335 marshal_new_auth(AUTH *auth)
338 XDR *xdrs = &xdr_stream;
341 assert(auth != NULL);
343 au = AUTH_PRIVATE(auth);
344 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE);
345 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) ||
346 (! xdr_opaque_auth(xdrs, &(auth->ah_verf))))
347 warnx("auth_none.c - Fatal marshalling problem");
349 au->au_mpos = XDR_GETPOS(xdrs);
353 static struct auth_ops *
356 static struct auth_ops ops;
358 /* VARIABLES PROTECTED BY ops_lock: ops */
360 mutex_lock(&ops_lock);
361 if (ops.ah_nextverf == NULL) {
362 ops.ah_nextverf = authunix_nextverf;
363 ops.ah_marshal = authunix_marshal;
364 ops.ah_validate = authunix_validate;
365 ops.ah_refresh = authunix_refresh;
366 ops.ah_destroy = authunix_destroy;
368 mutex_unlock(&ops_lock);