add another registry rpc (opnum 0x14). Have no idea what it's real name
[Samba.git] / source / lib / util_sec.c
blob132748ce138e147b2ae019e78bb970ed7ca9e408
1 /*
2 Unix SMB/CIFS implementation.
3 Copyright (C) Jeremy Allison 1998.
4 rewritten for version 2.0.6 by Tridge
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #ifndef AUTOCONF_TEST
22 #include "includes.h"
23 #else
24 /* we are running this code in autoconf test mode to see which type of setuid
25 function works */
26 #if defined(HAVE_UNISTD_H)
27 #include <unistd.h>
28 #endif
29 #include <stdlib.h>
30 #include <stdio.h>
31 #include <sys/types.h>
32 #include <errno.h>
34 #ifdef HAVE_SYS_PRIV_H
35 #include <sys/priv.h>
36 #endif
37 #ifdef HAVE_SYS_ID_H
38 #include <sys/id.h>
39 #endif
41 #define DEBUG(x, y) printf y
42 #define smb_panic(x) exit(1)
43 #define BOOL int
44 #endif
46 /* are we running as non-root? This is used by the regresison test code,
47 and potentially also for sites that want non-root smbd */
48 static uid_t initial_uid;
49 static gid_t initial_gid;
51 /****************************************************************************
52 remember what uid we got started as - this allows us to run correctly
53 as non-root while catching trapdoor systems
54 ****************************************************************************/
55 void sec_init(void)
57 initial_uid = geteuid();
58 initial_gid = getegid();
61 /****************************************************************************
62 some code (eg. winbindd) needs to know what uid we started as
63 ****************************************************************************/
64 uid_t sec_initial_uid(void)
66 return initial_uid;
69 /****************************************************************************
70 some code (eg. winbindd, profiling shm) needs to know what gid we started as
71 ****************************************************************************/
72 gid_t sec_initial_gid(void)
74 return initial_gid;
77 /****************************************************************************
78 are we running in non-root mode?
79 ****************************************************************************/
80 BOOL non_root_mode(void)
82 return (initial_uid != (uid_t)0);
85 /****************************************************************************
86 abort if we haven't set the uid correctly
87 ****************************************************************************/
88 static void assert_uid(uid_t ruid, uid_t euid)
90 if ((euid != (uid_t)-1 && geteuid() != euid) ||
91 (ruid != (uid_t)-1 && getuid() != ruid)) {
92 if (!non_root_mode()) {
93 DEBUG(0,("Failed to set uid privileges to (%d,%d) now set to (%d,%d)\n",
94 (int)ruid, (int)euid,
95 (int)getuid(), (int)geteuid()));
96 smb_panic("failed to set uid\n");
97 exit(1);
102 /****************************************************************************
103 abort if we haven't set the gid correctly
104 ****************************************************************************/
105 static void assert_gid(gid_t rgid, gid_t egid)
107 if ((egid != (gid_t)-1 && getegid() != egid) ||
108 (rgid != (gid_t)-1 && getgid() != rgid)) {
109 if (!non_root_mode()) {
110 DEBUG(0,("Failed to set gid privileges to (%d,%d) now set to (%d,%d) uid=(%d,%d)\n",
111 (int)rgid, (int)egid,
112 (int)getgid(), (int)getegid(),
113 (int)getuid(), (int)geteuid()));
114 smb_panic("failed to set gid\n");
115 exit(1);
120 /****************************************************************************
121 Gain root privilege before doing something.
122 We want to end up with ruid==euid==0
123 ****************************************************************************/
124 void gain_root_privilege(void)
126 #if USE_SETRESUID
127 setresuid(0,0,0);
128 #endif
130 #if USE_SETEUID
131 seteuid(0);
132 #endif
134 #if USE_SETREUID
135 setreuid(0, 0);
136 #endif
138 #if USE_SETUIDX
139 setuidx(ID_EFFECTIVE, 0);
140 setuidx(ID_REAL, 0);
141 #endif
143 /* this is needed on some systems */
144 setuid(0);
146 assert_uid(0, 0);
150 /****************************************************************************
151 Ensure our real and effective groups are zero.
152 we want to end up with rgid==egid==0
153 ****************************************************************************/
154 void gain_root_group_privilege(void)
156 #if USE_SETRESUID
157 setresgid(0,0,0);
158 #endif
160 #if USE_SETREUID
161 setregid(0,0);
162 #endif
164 #if USE_SETEUID
165 setegid(0);
166 #endif
168 #if USE_SETUIDX
169 setgidx(ID_EFFECTIVE, 0);
170 setgidx(ID_REAL, 0);
171 #endif
173 setgid(0);
175 assert_gid(0, 0);
179 /****************************************************************************
180 Set *only* the effective uid.
181 we want to end up with ruid==0 and euid==uid
182 ****************************************************************************/
183 void set_effective_uid(uid_t uid)
185 #if USE_SETRESUID
186 setresuid(-1,uid,-1);
187 #endif
189 #if USE_SETREUID
190 setreuid(-1,uid);
191 #endif
193 #if USE_SETEUID
194 seteuid(uid);
195 #endif
197 #if USE_SETUIDX
198 setuidx(ID_EFFECTIVE, uid);
199 #endif
201 assert_uid(-1, uid);
204 /****************************************************************************
205 Set *only* the effective gid.
206 we want to end up with rgid==0 and egid==gid
207 ****************************************************************************/
208 void set_effective_gid(gid_t gid)
210 #if USE_SETRESUID
211 setresgid(-1,gid,-1);
212 #endif
214 #if USE_SETREUID
215 setregid(-1,gid);
216 #endif
218 #if USE_SETEUID
219 setegid(gid);
220 #endif
222 #if USE_SETUIDX
223 setgidx(ID_EFFECTIVE, gid);
224 #endif
226 assert_gid(-1, gid);
229 static uid_t saved_euid, saved_ruid;
230 static gid_t saved_egid, saved_rgid;
232 /****************************************************************************
233 save the real and effective uid for later restoration. Used by the quotas
234 code
235 ****************************************************************************/
236 void save_re_uid(void)
238 saved_ruid = getuid();
239 saved_euid = geteuid();
243 /****************************************************************************
244 and restore them!
245 ****************************************************************************/
246 void restore_re_uid(void)
248 set_effective_uid(0);
250 #if USE_SETRESUID
251 setresuid(saved_ruid, saved_euid, -1);
252 #elif USE_SETREUID
253 setreuid(saved_ruid, -1);
254 setreuid(-1,saved_euid);
255 #elif USE_SETUIDX
256 setuidx(ID_REAL, saved_ruid);
257 setuidx(ID_EFFECTIVE, saved_euid);
258 #else
259 set_effective_uid(saved_euid);
260 if (getuid() != saved_ruid)
261 setuid(saved_ruid);
262 set_effective_uid(saved_euid);
263 #endif
265 assert_uid(saved_ruid, saved_euid);
269 /****************************************************************************
270 save the real and effective gid for later restoration. Used by the
271 getgroups code
272 ****************************************************************************/
273 void save_re_gid(void)
275 saved_rgid = getgid();
276 saved_egid = getegid();
279 /****************************************************************************
280 and restore them!
281 ****************************************************************************/
282 void restore_re_gid(void)
284 #if USE_SETRESUID
285 setresgid(saved_rgid, saved_egid, -1);
286 #elif USE_SETREUID
287 setregid(saved_rgid, -1);
288 setregid(-1,saved_egid);
289 #elif USE_SETUIDX
290 setgidx(ID_REAL, saved_rgid);
291 setgidx(ID_EFFECTIVE, saved_egid);
292 #else
293 set_effective_gid(saved_egid);
294 if (getgid() != saved_rgid)
295 setgid(saved_rgid);
296 set_effective_gid(saved_egid);
297 #endif
299 assert_gid(saved_rgid, saved_egid);
303 /****************************************************************************
304 set the real AND effective uid to the current effective uid in a way that
305 allows root to be regained.
306 This is only possible on some platforms.
307 ****************************************************************************/
308 int set_re_uid(void)
310 uid_t uid = geteuid();
312 #if USE_SETRESUID
313 setresuid(geteuid(), -1, -1);
314 #endif
316 #if USE_SETREUID
317 setreuid(0, 0);
318 setreuid(uid, -1);
319 setreuid(-1, uid);
320 #endif
322 #if USE_SETEUID
323 /* can't be done */
324 return -1;
325 #endif
327 #if USE_SETUIDX
328 /* can't be done */
329 return -1;
330 #endif
332 assert_uid(uid, uid);
333 return 0;
337 /****************************************************************************
338 Become the specified uid and gid - permanently !
339 there should be no way back if possible
340 ****************************************************************************/
341 void become_user_permanently(uid_t uid, gid_t gid)
344 * First - gain root privilege. We do this to ensure
345 * we can lose it again.
348 gain_root_privilege();
349 gain_root_group_privilege();
351 #if USE_SETRESUID
352 setresgid(gid,gid,gid);
353 setgid(gid);
354 setresuid(uid,uid,uid);
355 setuid(uid);
356 #endif
358 #if USE_SETREUID
359 setregid(gid,gid);
360 setgid(gid);
361 setreuid(uid,uid);
362 setuid(uid);
363 #endif
365 #if USE_SETEUID
366 setegid(gid);
367 setgid(gid);
368 setuid(uid);
369 seteuid(uid);
370 setuid(uid);
371 #endif
373 #if USE_SETUIDX
374 setgidx(ID_REAL, gid);
375 setgidx(ID_EFFECTIVE, gid);
376 setgid(gid);
377 setuidx(ID_REAL, uid);
378 setuidx(ID_EFFECTIVE, uid);
379 setuid(uid);
380 #endif
382 assert_uid(uid, uid);
383 assert_gid(gid, gid);
386 #ifdef AUTOCONF_TEST
388 /****************************************************************************
389 this function just checks that we don't get ENOSYS back
390 ****************************************************************************/
391 static int have_syscall(void)
393 errno = 0;
395 #if USE_SETRESUID
396 setresuid(-1,-1,-1);
397 #endif
399 #if USE_SETREUID
400 setreuid(-1,-1);
401 #endif
403 #if USE_SETEUID
404 seteuid(-1);
405 #endif
407 #if USE_SETUIDX
408 setuidx(ID_EFFECTIVE, -1);
409 #endif
411 if (errno == ENOSYS) return -1;
413 return 0;
416 main()
418 if (getuid() != 0) {
419 #if (defined(AIX) && defined(USE_SETREUID))
420 /* setreuid is badly broken on AIX 4.1, we avoid it completely */
421 fprintf(stderr,"avoiding possibly broken setreuid\n");
422 exit(1);
423 #endif
425 /* if not running as root then at least check to see if we get ENOSYS - this
426 handles Linux 2.0.x with glibc 2.1 */
427 fprintf(stderr,"not running as root: checking for ENOSYS\n");
428 exit(have_syscall());
431 gain_root_privilege();
432 gain_root_group_privilege();
433 set_effective_gid(1);
434 set_effective_uid(1);
435 save_re_uid();
436 restore_re_uid();
437 gain_root_privilege();
438 gain_root_group_privilege();
439 become_user_permanently(1, 1);
440 setuid(0);
441 if (getuid() == 0) {
442 fprintf(stderr,"uid not set permanently\n");
443 exit(1);
446 printf("OK\n");
448 exit(0);
450 #endif
452 /****************************************************************************
453 Check if we are setuid root. Used in libsmb and smbpasswd paranoia checks.
454 ****************************************************************************/
455 BOOL is_setuid_root(void)
457 return (geteuid() == (uid_t)0) && (getuid() != (uid_t)0);