1 /* $NetBSD: auth_unix.c,v 1.18 2000/07/06 03:03:30 christos Exp $ */
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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"
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(machname, uid, gid, len, aup_gids)
101 struct authunix_parms aup;
102 char mymem[MAX_AUTH_BYTES];
109 * Allocate and set up auth handle
112 auth = mem_alloc(sizeof(*auth));
115 warnx("authunix_create: out of memory");
116 goto cleanup_authunix_create;
119 au = mem_alloc(sizeof(*au));
122 warnx("authunix_create: out of memory");
123 goto cleanup_authunix_create;
126 auth->ah_ops = authunix_ops();
127 auth->ah_private = (caddr_t)au;
128 auth->ah_verf = au->au_shcred = _null_auth;
130 au->au_origcred.oa_base = NULL;
133 * fill in param struct from the given params
135 (void)gettimeofday(&now, NULL);
136 aup.aup_time = now.tv_sec;
137 aup.aup_machname = machname;
140 aup.aup_len = (u_int)len;
141 aup.aup_gids = aup_gids;
144 * Serialize the parameters into origcred
146 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE);
147 if (! xdr_authunix_parms(&xdrs, &aup))
149 au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs);
150 au->au_origcred.oa_flavor = AUTH_UNIX;
152 au->au_origcred.oa_base = mem_alloc((u_int) len);
154 if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) {
155 warnx("authunix_create: out of memory");
156 goto cleanup_authunix_create;
159 memmove(au->au_origcred.oa_base, mymem, (size_t)len);
162 * set auth handle to reflect new cred.
164 auth->ah_cred = au->au_origcred;
165 marshal_new_auth(auth);
168 cleanup_authunix_create:
170 mem_free(auth, sizeof(*auth));
172 if (au->au_origcred.oa_base)
173 mem_free(au->au_origcred.oa_base, (u_int)len);
174 mem_free(au, sizeof(*au));
181 * Returns an auth handle with parameters determined by doing lots of
185 authunix_create_default()
188 char machname[MAXHOSTNAMELEN + 1];
193 if (gethostname(machname, sizeof machname) == -1)
195 machname[sizeof(machname) - 1] = 0;
198 if ((len = getgroups(NGRPS, gids)) < 0)
200 /* XXX: interface problem; those should all have been unsigned */
201 return (authunix_create(machname, (int)uid, (int)gid, len,
206 * authunix operations
211 authunix_nextverf(auth)
214 /* no action necessary */
218 authunix_marshal(auth, xdrs)
224 assert(auth != NULL);
225 assert(xdrs != NULL);
227 au = AUTH_PRIVATE(auth);
228 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos));
232 authunix_validate(auth, verf)
234 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)
315 assert(auth != NULL);
317 au = AUTH_PRIVATE(auth);
318 mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length);
320 if (au->au_shcred.oa_base != NULL)
321 mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length);
323 mem_free(auth->ah_private, sizeof(struct audata));
325 if (auth->ah_verf.oa_base != NULL)
326 mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length);
328 mem_free(auth, sizeof(*auth));
332 * Marshals (pre-serializes) an auth struct.
333 * sets private data, au_marshed and au_mpos
336 marshal_new_auth(auth)
340 XDR *xdrs = &xdr_stream;
343 assert(auth != NULL);
345 au = AUTH_PRIVATE(auth);
346 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE);
347 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) ||
348 (! xdr_opaque_auth(xdrs, &(auth->ah_verf))))
349 warnx("auth_none.c - Fatal marshalling problem");
351 au->au_mpos = XDR_GETPOS(xdrs);
355 static struct auth_ops *
358 static struct auth_ops ops;
359 extern mutex_t ops_lock;
361 /* VARIABLES PROTECTED BY ops_lock: ops */
363 mutex_lock(&ops_lock);
364 if (ops.ah_nextverf == NULL) {
365 ops.ah_nextverf = authunix_nextverf;
366 ops.ah_marshal = authunix_marshal;
367 ops.ah_validate = authunix_validate;
368 ops.ah_refresh = authunix_refresh;
369 ops.ah_destroy = authunix_destroy;
371 mutex_unlock(&ops_lock);