1 /* @(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC */
2 /*
3 * Copyright (c) 2010, Oracle America, Inc.
4 *
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * * Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 *
18 * * Neither the name of the "Oracle America, Inc." nor the names of
19 * its contributors may be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
23 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
25 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
26 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
28 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
29 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34 #if !defined(lint) && defined(SCCSIDS)
35 static char sccsid[] = "@(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro";
36 #endif
37
38 /*
39 * auth_unix.c, Implements UNIX style authentication parameters.
40 *
41 * The system is very weak. The client uses no encryption for its
42 * credentials and only sends null verifiers. The server sends backs
43 * null verifiers or optionally a verifier that suggests a new short hand
44 * for the credentials.
45 *
46 */
47
48 #include "autoconf.h"
49 #include <stdio.h>
50 #include <unistd.h>
51 #include <string.h>
52
53 #include <gssrpc/types.h>
54 #include <gssrpc/xdr.h>
55 #include <gssrpc/auth.h>
56 #include <gssrpc/auth_unix.h>
57
58 /*
59 * Unix authenticator operations vector
60 */
61 static void authunix_nextverf(AUTH *);
62 static bool_t authunix_marshal(AUTH *, XDR *);
63 static bool_t authunix_validate(AUTH *, struct opaque_auth *);
64 static bool_t authunix_refresh(AUTH *, struct rpc_msg *);
65 static void authunix_destroy(AUTH *);
66 static bool_t authunix_wrap(AUTH *, XDR *, xdrproc_t, caddr_t);
67
68 static struct auth_ops auth_unix_ops = {
69 authunix_nextverf,
70 authunix_marshal,
71 authunix_validate,
72 authunix_refresh,
73 authunix_destroy,
74 authunix_wrap,
75 authunix_wrap
76 };
77
78 /*
79 * This struct is pointed to by the ah_private field of an auth_handle.
80 */
81 struct audata {
82 struct opaque_auth au_origcred; /* original credentials */
83 struct opaque_auth au_shcred; /* short hand cred */
84 uint32_t au_shfaults; /* short hand cache faults */
85 char au_marshed[MAX_AUTH_BYTES];
86 u_int au_mpos; /* xdr pos at end of marshed */
87 };
88 #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private)
89
90 static void marshal_new_auth(AUTH *);
91
92
93 /*
94 * Create a unix style authenticator.
95 * Returns an auth handle with the given stuff in it.
96 */
97 AUTH *
authunix_create(char * machname,int uid,int gid,int len,int * aup_gids)98 authunix_create(
99 char *machname,
100 int uid,
101 int gid,
102 int len,
103 int *aup_gids)
104 {
105 struct authunix_parms aup;
106 char mymem[MAX_AUTH_BYTES];
107 struct timeval now;
108 XDR xdrs;
109 AUTH *auth;
110 struct audata *au;
111
112 /*
113 * Allocate and set up auth handle
114 */
115 auth = (AUTH *)mem_alloc(sizeof(*auth));
116 #ifndef KERNEL
117 if (auth == NULL) {
118 (void)fprintf(stderr, "authunix_create: out of memory\n");
119 return (NULL);
120 }
121 #endif
122 au = (struct audata *)mem_alloc(sizeof(*au));
123 #ifndef KERNEL
124 if (au == NULL) {
125 (void)fprintf(stderr, "authunix_create: out of memory\n");
126 return (NULL);
127 }
128 #endif
129 auth->ah_ops = &auth_unix_ops;
130 auth->ah_private = (caddr_t)au;
131 auth->ah_verf = au->au_shcred = gssrpc__null_auth;
132 au->au_shfaults = 0;
133
134 /*
135 * fill in param struct from the given params
136 */
137 (void)gettimeofday(&now, (struct timezone *)0);
138 aup.aup_time = now.tv_sec;
139 aup.aup_machname = machname;
140 aup.aup_uid = uid;
141 aup.aup_gid = gid;
142 aup.aup_len = (u_int)len;
143 aup.aup_gids = aup_gids;
144
145 /*
146 * Serialize the parameters into origcred
147 */
148 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE);
149 if (! xdr_authunix_parms(&xdrs, &aup))
150 abort();
151 au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs);
152 au->au_origcred.oa_flavor = AUTH_UNIX;
153 #ifdef KERNEL
154 au->au_origcred.oa_base = mem_alloc((u_int) len);
155 #else
156 if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) {
157 (void)fprintf(stderr, "authunix_create: out of memory\n");
158 return (NULL);
159 }
160 #endif
161 memmove(au->au_origcred.oa_base, mymem, (u_int)len);
162
163 /*
164 * set auth handle to reflect new cred.
165 */
166 auth->ah_cred = au->au_origcred;
167 marshal_new_auth(auth);
168 return (auth);
169 }
170
171 /*
172 * Returns an auth handle with parameters determined by doing lots of
173 * syscalls.
174 */
175 AUTH *
authunix_create_default(void)176 authunix_create_default(void)
177 {
178 int len;
179 char machname[MAX_MACHINE_NAME + 1];
180 int uid;
181 int gid;
182 GETGROUPS_T gids[NGRPS];
183 int igids[NGRPS], i;
184
185 if (gethostname(machname, MAX_MACHINE_NAME) == -1)
186 abort();
187 machname[MAX_MACHINE_NAME] = 0;
188 uid = geteuid();
189 gid = getegid();
190 if ((len = getgroups(NGRPS, gids)) < 0)
191 abort();
192 for(i = 0; i < NGRPS; i++) {
193 igids[i] = gids[i];
194 }
195 return (authunix_create(machname, uid, gid, len, igids));
196 }
197
198 /*
199 * authunix operations
200 */
201
202 static void
authunix_nextverf(AUTH * auth)203 authunix_nextverf(AUTH *auth)
204 {
205 /* no action necessary */
206 }
207
208 static bool_t
authunix_marshal(AUTH * auth,XDR * xdrs)209 authunix_marshal(AUTH *auth, XDR *xdrs)
210 {
211 struct audata *au = AUTH_PRIVATE(auth);
212
213 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos));
214 }
215
216 static bool_t
authunix_validate(AUTH * auth,struct opaque_auth * verf)217 authunix_validate(AUTH *auth, struct opaque_auth *verf)
218 {
219 struct audata *au;
220 XDR xdrs;
221
222 if (verf->oa_flavor == AUTH_SHORT) {
223 au = AUTH_PRIVATE(auth);
224 xdrmem_create(&xdrs, verf->oa_base, verf->oa_length, XDR_DECODE);
225
226 if (au->au_shcred.oa_base != NULL) {
227 mem_free(au->au_shcred.oa_base,
228 au->au_shcred.oa_length);
229 au->au_shcred.oa_base = NULL;
230 }
231 if (xdr_opaque_auth(&xdrs, &au->au_shcred)) {
232 auth->ah_cred = au->au_shcred;
233 } else {
234 xdrs.x_op = XDR_FREE;
235 (void)xdr_opaque_auth(&xdrs, &au->au_shcred);
236 au->au_shcred.oa_base = NULL;
237 auth->ah_cred = au->au_origcred;
238 }
239 marshal_new_auth(auth);
240 }
241 return (TRUE);
242 }
243
244 static bool_t
authunix_refresh(AUTH * auth,struct rpc_msg * msg)245 authunix_refresh(AUTH *auth, struct rpc_msg *msg)
246 {
247 struct audata *au = AUTH_PRIVATE(auth);
248 struct authunix_parms aup;
249 struct timeval now;
250 XDR xdrs;
251 int stat;
252
253 if (auth->ah_cred.oa_base == au->au_origcred.oa_base) {
254 /* there is no hope. Punt */
255 return (FALSE);
256 }
257 au->au_shfaults ++;
258
259 /* first deserialize the creds back into a struct authunix_parms */
260 aup.aup_machname = NULL;
261 aup.aup_gids = (int *)NULL;
262 xdrmem_create(&xdrs, au->au_origcred.oa_base,
263 au->au_origcred.oa_length, XDR_DECODE);
264 stat = xdr_authunix_parms(&xdrs, &aup);
265 if (! stat)
266 goto done;
267
268 /* update the time and serialize in place */
269 (void)gettimeofday(&now, (struct timezone *)0);
270 aup.aup_time = now.tv_sec;
271 xdrs.x_op = XDR_ENCODE;
272 XDR_SETPOS(&xdrs, 0);
273 stat = xdr_authunix_parms(&xdrs, &aup);
274 if (! stat)
275 goto done;
276 auth->ah_cred = au->au_origcred;
277 marshal_new_auth(auth);
278 done:
279 /* free the struct authunix_parms created by deserializing */
280 xdrs.x_op = XDR_FREE;
281 (void)xdr_authunix_parms(&xdrs, &aup);
282 XDR_DESTROY(&xdrs);
283 return (stat);
284 }
285
286 static void
authunix_destroy(AUTH * auth)287 authunix_destroy(AUTH *auth)
288 {
289 struct audata *au = AUTH_PRIVATE(auth);
290
291 mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length);
292
293 if (au->au_shcred.oa_base != NULL)
294 mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length);
295
296 mem_free(auth->ah_private, sizeof(struct audata));
297
298 if (auth->ah_verf.oa_base != NULL)
299 mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length);
300
301 mem_free((caddr_t)auth, sizeof(*auth));
302 }
303
304 /*
305 * Marshals (pre-serializes) an auth struct.
306 * sets private data, au_marshed and au_mpos
307 */
308 static void
marshal_new_auth(AUTH * auth)309 marshal_new_auth(AUTH *auth)
310 {
311 XDR xdr_stream;
312 XDR *xdrs = &xdr_stream;
313 struct audata *au = AUTH_PRIVATE(auth);
314
315 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE);
316 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) ||
317 (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) {
318 perror("auth_none.c - Fatal marshalling problem");
319 } else {
320 au->au_mpos = XDR_GETPOS(xdrs);
321 }
322 XDR_DESTROY(xdrs);
323 }
324
325 static bool_t
authunix_wrap(AUTH * auth,XDR * xdrs,xdrproc_t xfunc,caddr_t xwhere)326 authunix_wrap(AUTH *auth, XDR *xdrs, xdrproc_t xfunc, caddr_t xwhere)
327 {
328 return ((*xfunc)(xdrs, xwhere));
329 }
330