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30 * Copyright (C) 1984, Sun Microsystems, Inc.
33 * auth_unix.c, Implements UNIX style authentication parameters.
35 * The system is very weak. The client uses no encryption for it's
36 * credentials and only sends null verifiers. The server sends backs
37 * null verifiers or optionally a verifier that suggests a new short hand
38 * for the credentials.
46 #include <sys/param.h>
48 #include <rpc/types.h>
51 #include <rpc/auth_unix.h>
58 * Unix authenticator operations vector
60 static void authunix_nextverf (AUTH *);
61 static bool_t authunix_marshal (AUTH *, XDR *);
62 static bool_t authunix_validate (AUTH *, struct opaque_auth *);
63 static bool_t authunix_refresh (AUTH *);
64 static void authunix_destroy (AUTH *);
66 static struct auth_ops auth_unix_ops = {
75 * This struct is pointed to by the ah_private field of an auth_handle.
78 struct opaque_auth au_origcred; /* original credentials */
79 struct opaque_auth au_shcred; /* short hand cred */
80 u_long au_shfaults; /* short hand cache faults */
81 char au_marshed[MAX_AUTH_BYTES];
82 u_int au_mpos; /* xdr pos at end of marshed */
84 #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private)
86 static bool_t marshal_new_auth (AUTH *) internal_function;
90 * Create a unix style authenticator.
91 * Returns an auth handle with the given stuff in it.
94 authunix_create (char *machname, uid_t uid, gid_t gid, int len,
97 struct authunix_parms aup;
98 char mymem[MAX_AUTH_BYTES];
105 * Allocate and set up auth handle
107 auth = (AUTH *) mem_alloc (sizeof (*auth));
108 au = (struct audata *) mem_alloc (sizeof (*au));
109 if (auth == NULL || au == NULL)
113 if (_IO_fwide (stderr, 0) > 0)
114 (void) __fwprintf (stderr, L"%s",
115 _("authunix_create: out of memory\n"));
118 (void) fputs (_("authunix_create: out of memory\n"), stderr);
119 mem_free (auth, sizeof (*auth));
120 mem_free (au, sizeof (*au));
123 auth->ah_ops = &auth_unix_ops;
124 auth->ah_private = (caddr_t) au;
125 auth->ah_verf = au->au_shcred = _null_auth;
129 * fill in param struct from the given params
131 (void) __gettimeofday (&now, (struct timezone *) 0);
132 aup.aup_time = now.tv_sec;
133 aup.aup_machname = machname;
136 aup.aup_len = (u_int) len;
137 aup.aup_gids = aup_gids;
140 * Serialize the parameters into origcred
142 INTUSE(xdrmem_create) (&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE);
143 if (!INTUSE(xdr_authunix_parms) (&xdrs, &aup))
145 au->au_origcred.oa_length = len = XDR_GETPOS (&xdrs);
146 au->au_origcred.oa_flavor = AUTH_UNIX;
147 au->au_origcred.oa_base = mem_alloc ((u_int) len);
148 if (au->au_origcred.oa_base == NULL)
150 memcpy(au->au_origcred.oa_base, mymem, (u_int) len);
153 * set auth handle to reflect new cred.
155 auth->ah_cred = au->au_origcred;
156 marshal_new_auth (auth);
159 INTDEF (authunix_create)
162 * Returns an auth handle with parameters determined by doing lots of
166 authunix_create_default (void)
169 char machname[MAX_MACHINE_NAME + 1];
172 int max_nr_groups = __sysconf (_SC_NGROUPS_MAX);
173 gid_t gids[max_nr_groups];
175 if (__gethostname (machname, MAX_MACHINE_NAME) == -1)
177 machname[MAX_MACHINE_NAME] = 0;
181 if ((len = __getgroups (max_nr_groups, gids)) < 0)
183 /* This braindamaged Sun code forces us here to truncate the
184 list of groups to NGRPS members since the code in
185 authuxprot.c transforms a fixed array. Grrr. */
186 return INTUSE(authunix_create) (machname, uid, gid, MIN (NGRPS, len), gids);
188 INTDEF (authunix_create_default)
191 * authunix operations
195 authunix_nextverf (AUTH *auth)
197 /* no action necessary */
201 authunix_marshal (AUTH *auth, XDR *xdrs)
203 struct audata *au = AUTH_PRIVATE (auth);
205 return XDR_PUTBYTES (xdrs, au->au_marshed, au->au_mpos);
209 authunix_validate (AUTH *auth, struct opaque_auth *verf)
214 if (verf->oa_flavor == AUTH_SHORT)
216 au = AUTH_PRIVATE (auth);
217 INTUSE(xdrmem_create) (&xdrs, verf->oa_base, verf->oa_length,
220 if (au->au_shcred.oa_base != NULL)
222 mem_free (au->au_shcred.oa_base,
223 au->au_shcred.oa_length);
224 au->au_shcred.oa_base = NULL;
226 if (INTUSE(xdr_opaque_auth) (&xdrs, &au->au_shcred))
228 auth->ah_cred = au->au_shcred;
232 xdrs.x_op = XDR_FREE;
233 (void) INTUSE(xdr_opaque_auth) (&xdrs, &au->au_shcred);
234 au->au_shcred.oa_base = NULL;
235 auth->ah_cred = au->au_origcred;
237 marshal_new_auth (auth);
243 authunix_refresh (AUTH *auth)
245 struct audata *au = AUTH_PRIVATE (auth);
246 struct authunix_parms aup;
251 if (auth->ah_cred.oa_base == au->au_origcred.oa_base)
253 /* there is no hope. Punt */
258 /* first deserialize the creds back into a struct authunix_parms */
259 aup.aup_machname = NULL;
260 aup.aup_gids = (gid_t *) NULL;
261 INTUSE(xdrmem_create) (&xdrs, au->au_origcred.oa_base,
262 au->au_origcred.oa_length, XDR_DECODE);
263 stat = INTUSE(xdr_authunix_parms) (&xdrs, &aup);
267 /* update the time and serialize in place */
268 (void) __gettimeofday (&now, (struct timezone *) 0);
269 aup.aup_time = now.tv_sec;
270 xdrs.x_op = XDR_ENCODE;
271 XDR_SETPOS (&xdrs, 0);
272 stat = INTUSE(xdr_authunix_parms) (&xdrs, &aup);
275 auth->ah_cred = au->au_origcred;
276 marshal_new_auth (auth);
278 /* free the struct authunix_parms created by deserializing */
279 xdrs.x_op = XDR_FREE;
280 (void) INTUSE(xdr_authunix_parms) (&xdrs, &aup);
286 authunix_destroy (AUTH *auth)
288 struct audata *au = AUTH_PRIVATE (auth);
290 mem_free (au->au_origcred.oa_base, au->au_origcred.oa_length);
292 if (au->au_shcred.oa_base != NULL)
293 mem_free (au->au_shcred.oa_base, au->au_shcred.oa_length);
295 mem_free (auth->ah_private, sizeof (struct audata));
297 if (auth->ah_verf.oa_base != NULL)
298 mem_free (auth->ah_verf.oa_base, auth->ah_verf.oa_length);
300 mem_free ((caddr_t) auth, sizeof (*auth));
304 * Marshals (pre-serializes) an auth struct.
305 * sets private data, au_marshed and au_mpos
309 marshal_new_auth (AUTH *auth)
312 XDR *xdrs = &xdr_stream;
313 struct audata *au = AUTH_PRIVATE (auth);
315 INTUSE(xdrmem_create) (xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE);
316 if ((!INTUSE(xdr_opaque_auth) (xdrs, &(auth->ah_cred))) ||
317 (!INTUSE(xdr_opaque_auth) (xdrs, &(auth->ah_verf))))
318 perror (_("auth_none.c - Fatal marshalling problem"));
320 au->au_mpos = XDR_GETPOS (xdrs);