1 /*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1995, 1996
5 * Bill Paul <wpaul@ctr.columbia.edu>. 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
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Bill Paul.
18 * 4. Neither the name of the author nor the names of any co-contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include <sys/param.h>
36 #include <sys/fcntl.h>
37 #include <sys/socket.h>
38 #include <sys/stat.h>
39 #include <sys/wait.h>
40
41 #include <arpa/inet.h>
42 #include <netinet/in.h>
43
44 #include <ctype.h>
45 #include <db.h>
46 #include <dirent.h>
47 #include <errno.h>
48 #include <limits.h>
49 #include <pwd.h>
50 #include <signal.h>
51 #include <stdio.h>
52 #include <stdlib.h>
53 #include <string.h>
54 #include <unistd.h>
55
56 #include <libgen.h>
57 #include <libutil.h>
58
59 #include <rpc/rpc.h>
60 #include <rpcsvc/yp.h>
61 struct dom_binding;
62 #include <rpcsvc/ypclnt.h>
63 #include "yppasswdd_extern.h"
64 #include "yppasswd.h"
65 #include "yppasswd_private.h"
66 #include "ypxfr_extern.h"
67 #include "yp_extern.h"
68
69 static struct passwd yp_password;
70
71 static void
xlate_passwd(struct x_master_passwd * xpwd,struct passwd * pwd)72 xlate_passwd(struct x_master_passwd *xpwd, struct passwd *pwd)
73 {
74 pwd->pw_name = xpwd->pw_name;
75 pwd->pw_passwd = xpwd->pw_passwd;
76 pwd->pw_uid = xpwd->pw_uid;
77 pwd->pw_gid = xpwd->pw_gid;
78 pwd->pw_change = xpwd->pw_change;
79 pwd->pw_class = xpwd->pw_class;
80 pwd->pw_gecos = xpwd->pw_gecos;
81 pwd->pw_dir = xpwd->pw_dir;
82 pwd->pw_shell = xpwd->pw_shell;
83 pwd->pw_expire = xpwd->pw_expire;
84 pwd->pw_fields = xpwd->pw_fields;
85 }
86
87 static void
copy_yp_pass(char * p,int x,int m)88 copy_yp_pass(char *p, int x, int m)
89 {
90 char *t, *s = p;
91 static char *buf;
92
93 yp_password.pw_fields = 0;
94
95 buf = realloc(buf, m + 10);
96 bzero(buf, m + 10);
97
98 /* Turn all colons into NULLs */
99 while (strchr(s, ':')) {
100 s = (strchr(s, ':') + 1);
101 *(s - 1)= '\0';
102 }
103
104 t = buf;
105 #define EXPAND(e) do { \
106 e = t; \
107 while ((*t++ = *p++)); \
108 } while (0)
109 EXPAND(yp_password.pw_name);
110 yp_password.pw_fields |= _PWF_NAME;
111 EXPAND(yp_password.pw_passwd);
112 yp_password.pw_fields |= _PWF_PASSWD;
113 yp_password.pw_uid = atoi(p);
114 p += (strlen(p) + 1);
115 yp_password.pw_fields |= _PWF_UID;
116 yp_password.pw_gid = atoi(p);
117 p += (strlen(p) + 1);
118 yp_password.pw_fields |= _PWF_GID;
119 if (x) {
120 EXPAND(yp_password.pw_class);
121 yp_password.pw_fields |= _PWF_CLASS;
122 yp_password.pw_change = atol(p);
123 p += (strlen(p) + 1);
124 yp_password.pw_fields |= _PWF_CHANGE;
125 yp_password.pw_expire = atol(p);
126 p += (strlen(p) + 1);
127 yp_password.pw_fields |= _PWF_EXPIRE;
128 }
129 EXPAND(yp_password.pw_gecos);
130 yp_password.pw_fields |= _PWF_GECOS;
131 EXPAND(yp_password.pw_dir);
132 yp_password.pw_fields |= _PWF_DIR;
133 EXPAND(yp_password.pw_shell);
134 yp_password.pw_fields |= _PWF_SHELL;
135 }
136
137 static int
validchars(char * arg)138 validchars(char *arg)
139 {
140 size_t i;
141
142 for (i = 0; i < strlen(arg); i++) {
143 if (iscntrl(arg[i])) {
144 yp_error("string contains a control character");
145 return(1);
146 }
147 if (arg[i] == ':') {
148 yp_error("string contains a colon");
149 return(1);
150 }
151 /* Be evil: truncate strings with \n in them silently. */
152 if (arg[i] == '\n') {
153 arg[i] = '\0';
154 return(0);
155 }
156 }
157 return(0);
158 }
159
160 static int
validate_master(struct passwd * opw __unused,struct x_master_passwd * npw)161 validate_master(struct passwd *opw __unused, struct x_master_passwd *npw)
162 {
163
164 if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') {
165 yp_error("client tried to modify an NIS entry");
166 return(1);
167 }
168
169 if (validchars(npw->pw_shell)) {
170 yp_error("specified shell contains invalid characters");
171 return(1);
172 }
173
174 if (validchars(npw->pw_gecos)) {
175 yp_error("specified gecos field contains invalid characters");
176 return(1);
177 }
178
179 if (validchars(npw->pw_passwd)) {
180 yp_error("specified password contains invalid characters");
181 return(1);
182 }
183 return(0);
184 }
185
186 static int
validate(struct passwd * opw,struct x_passwd * npw)187 validate(struct passwd *opw, struct x_passwd *npw)
188 {
189
190 if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') {
191 yp_error("client tried to modify an NIS entry");
192 return(1);
193 }
194
195 if ((uid_t)npw->pw_uid != opw->pw_uid) {
196 yp_error("UID mismatch: client says user %s has UID %d",
197 npw->pw_name, npw->pw_uid);
198 yp_error("database says user %s has UID %d", opw->pw_name,
199 opw->pw_uid);
200 return(1);
201 }
202
203 if ((gid_t)npw->pw_gid != opw->pw_gid) {
204 yp_error("GID mismatch: client says user %s has GID %d",
205 npw->pw_name, npw->pw_gid);
206 yp_error("database says user %s has GID %d", opw->pw_name,
207 opw->pw_gid);
208 return(1);
209 }
210
211 /*
212 * Don't allow the user to shoot himself in the foot,
213 * even on purpose.
214 */
215 if (!no_chsh && !ok_shell(npw->pw_shell)) {
216 yp_error("%s is not a valid shell", npw->pw_shell);
217 return(1);
218 }
219
220 if (!no_chsh && validchars(npw->pw_shell)) {
221 yp_error("specified shell contains invalid characters");
222 return(1);
223 }
224
225 if (validchars(npw->pw_gecos)) {
226 yp_error("specified gecos field contains invalid characters");
227 return(1);
228 }
229
230 if (validchars(npw->pw_passwd)) {
231 yp_error("specified password contains invalid characters");
232 return(1);
233 }
234 return(0);
235 }
236
237 /*
238 * Kludge alert:
239 * In order to have one rpc.yppasswdd support multiple domains,
240 * we have to cheat: we search each directory under /var/yp
241 * and try to match the user in each master.passwd.byname
242 * map that we find. If the user matches (username, uid and gid
243 * all agree), then we use that domain. If we match the user in
244 * more than one database, we must abort.
245 */
246 static char *
find_domain(struct x_passwd * pw)247 find_domain(struct x_passwd *pw)
248 {
249 struct stat statbuf;
250 struct dirent *dirp;
251 DIR *dird;
252 char yp_mapdir[MAXPATHLEN + 2];
253 static char domain[YPMAXDOMAIN];
254 char *tmp = NULL;
255 DBT key, data;
256 int hit = 0;
257
258 yp_error("performing multidomain lookup");
259
260 if ((dird = opendir(yp_dir)) == NULL) {
261 yp_error("opendir(%s) failed: %s", yp_dir, strerror(errno));
262 return(NULL);
263 }
264
265 while ((dirp = readdir(dird)) != NULL) {
266 snprintf(yp_mapdir, sizeof yp_mapdir, "%s/%s",
267 yp_dir, dirp->d_name);
268 if (stat(yp_mapdir, &statbuf) < 0) {
269 yp_error("stat(%s) failed: %s", yp_mapdir,
270 strerror(errno));
271 closedir(dird);
272 return(NULL);
273 }
274 if (S_ISDIR(statbuf.st_mode)) {
275 tmp = (char *)dirp->d_name;
276 key.data = pw->pw_name;
277 key.size = strlen(pw->pw_name);
278
279 if (yp_get_record(tmp,"master.passwd.byname",
280 &key, &data, 0) != YP_TRUE) {
281 continue;
282 }
283 *((char *)data.data + data.size) = '\0';
284 copy_yp_pass(data.data, 1, data.size);
285 if (yp_password.pw_uid == (uid_t)pw->pw_uid &&
286 yp_password.pw_gid == (gid_t)pw->pw_gid) {
287 hit++;
288 snprintf(domain, YPMAXDOMAIN, "%s", tmp);
289 }
290 }
291 }
292
293 closedir(dird);
294 if (hit > 1) {
295 yp_error("found same user in two different domains");
296 return(NULL);
297 } else
298 return((char *)&domain);
299 }
300
301 static const char *maps[] = {
302 "master.passwd.byname",
303 "master.passwd.byuid",
304 "passwd.byname",
305 "passwd.byuid"
306 };
307
308 static const char *formats[] = {
309 "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s",
310 "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s",
311 "%s:%s:%d:%d:%s:%s:%s",
312 "%s:%s:%d:%d:%s:%s:%s"
313 };
314
315 static int
update_inplace(struct passwd * pw,char * domain)316 update_inplace(struct passwd *pw, char *domain)
317 {
318 DB *dbp = NULL;
319 DBT key = { NULL, 0 };
320 DBT data = { NULL, 0 };
321 char *pwbuf;
322 char keybuf[20];
323 int i;
324 char *ptr = NULL;
325 static char yp_last[] = "YP_LAST_MODIFIED";
326 char yplastbuf[64];
327
328 snprintf(yplastbuf, sizeof yplastbuf, "%llu",
329 (unsigned long long)time(NULL));
330 pwbuf = NULL;
331
332 for (i = 0; i < 4; i++) {
333
334 if (i % 2) {
335 snprintf(keybuf, sizeof keybuf,
336 "%llu", (unsigned long long)pw->pw_uid);
337 key.data = &keybuf;
338 key.size = strlen(keybuf);
339 } else {
340 key.data = pw->pw_name;
341 key.size = strlen(pw->pw_name);
342 }
343
344 /*
345 * XXX The passwd.byname and passwd.byuid maps come in
346 * two flavors: secure and insecure. The secure version
347 * has a '*' in the password field whereas the insecure one
348 * has a real crypted password. The maps will be insecure
349 * if they were built with 'unsecure = TRUE' enabled in
350 * /var/yp/Makefile, but we'd have no way of knowing if
351 * this has been done unless we were to try parsing the
352 * Makefile, which is a disgusting thought. Instead, we
353 * read the records from the maps, skip to the first ':'
354 * in them, and then look at the character immediately
355 * following it. If it's an '*' then the map is 'secure'
356 * and we must not insert a real password into the pw_passwd
357 * field. If it's not an '*', then we put the real crypted
358 * password in.
359 */
360 if (yp_get_record(domain,maps[i],&key,&data,1) != YP_TRUE) {
361 yp_error("couldn't read %s/%s: %s", domain,
362 maps[i], strerror(errno));
363 goto ret1;
364 }
365
366 if ((ptr = strchr(data.data, ':')) == NULL) {
367 yp_error("no colon in passwd record?!");
368 goto ret1;
369 }
370
371 /*
372 * XXX Supposing we have more than one user with the same
373 * UID? (Or more than one user with the same name?) We could
374 * end up modifying the wrong record if were not careful.
375 */
376 if (i % 2) {
377 if (strncmp(data.data, pw->pw_name,
378 strlen(pw->pw_name))) {
379 yp_error("warning: found entry for UID %d \
380 in map %s@%s with wrong name (%.*s)", pw->pw_uid, maps[i], domain,
381 (int)(ptr - (char *)data.data),
382 (char *)data.data);
383 yp_error("there may be more than one user \
384 with the same UID - continuing");
385 continue;
386 }
387 } else {
388 /*
389 * We're really being ultra-paranoid here.
390 * This is generally a 'can't happen' condition.
391 */
392 free(pwbuf);
393 asprintf(&pwbuf, ":%d:%d:", pw->pw_uid, pw->pw_gid);
394 if (pwbuf == NULL) {
395 yp_error("no memory");
396 goto ret1;
397 }
398 if (!strstr(data.data, pwbuf)) {
399 yp_error("warning: found entry for user %s \
400 in map %s@%s with wrong UID", pw->pw_name, maps[i], domain);
401 yp_error("there may be more than one user \
402 with the same name - continuing");
403 continue;
404 }
405 }
406
407 if (i < 2) {
408 free(pwbuf);
409 asprintf(&pwbuf, formats[i],
410 pw->pw_name, pw->pw_passwd, pw->pw_uid,
411 pw->pw_gid, pw->pw_class, pw->pw_change,
412 pw->pw_expire, pw->pw_gecos, pw->pw_dir,
413 pw->pw_shell);
414 } else {
415 free(pwbuf);
416 asprintf(&pwbuf, formats[i],
417 pw->pw_name, *(ptr+1) == '*' ? "*" : pw->pw_passwd,
418 pw->pw_uid, pw->pw_gid, pw->pw_gecos, pw->pw_dir,
419 pw->pw_shell);
420 }
421 if (pwbuf == NULL) {
422 yp_error("no memory");
423 goto ret1;
424 }
425
426 #define FLAGS O_RDWR|O_CREAT
427
428 if ((dbp = yp_open_db_rw(domain, maps[i], FLAGS)) == NULL) {
429 yp_error("couldn't open %s/%s r/w: %s",domain,
430 maps[i],strerror(errno));
431 goto ret1;
432 }
433
434 data.data = pwbuf;
435 data.size = strlen(pwbuf);
436
437 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) {
438 yp_error("failed to update record in %s/%s", domain,
439 maps[i]);
440 (void)(dbp->close)(dbp);
441 goto ret1;
442 }
443
444 key.data = yp_last;
445 key.size = strlen(yp_last);
446 data.data = (char *)&yplastbuf;
447 data.size = strlen(yplastbuf);
448
449 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) {
450 yp_error("failed to update timestamp in %s/%s", domain,
451 maps[i]);
452 (void)(dbp->close)(dbp);
453 goto ret1;
454 }
455
456 (void)(dbp->close)(dbp);
457 }
458
459 free(pwbuf);
460 return (0);
461 ret1:
462 free(pwbuf);
463 return (1);
464 }
465
466 int *
yppasswdproc_update_1_svc(yppasswd * argp,struct svc_req * rqstp)467 yppasswdproc_update_1_svc(yppasswd *argp, struct svc_req *rqstp)
468 {
469 static int result;
470 struct sockaddr_in *rqhost;
471 DBT key, data;
472 int rval = 0;
473 int pfd, tfd;
474 int pid;
475 int passwd_changed = 0;
476 int shell_changed = 0;
477 int gecos_changed = 0;
478 char *cryptpw;
479 char *oldshell = NULL;
480 char *oldgecos = NULL;
481 char *passdir;
482 char *passfile_hold;
483 char passdir_buf[MAXPATHLEN + 2];
484 char passfile_buf[MAXPATHLEN + 2];
485 char passfile_hold_buf[MAXPATHLEN + 2];
486 char *domain = yppasswd_domain;
487 static struct sockaddr_in clntaddr;
488 static struct timeval t_saved, t_test;
489
490 /*
491 * Normal user updates always use the 'default' master.passwd file.
492 */
493
494 passfile = passfile_default;
495 result = 1;
496
497 rqhost = svc_getcaller(rqstp->rq_xprt);
498
499 gettimeofday(&t_test, NULL);
500 if (!bcmp(rqhost, &clntaddr, sizeof *rqhost) &&
501 t_test.tv_sec > t_saved.tv_sec &&
502 t_test.tv_sec - t_saved.tv_sec < 300) {
503
504 bzero(&clntaddr, sizeof clntaddr);
505 bzero(&t_saved, sizeof t_saved);
506 return(NULL);
507 }
508
509 bcopy(rqhost, &clntaddr, sizeof clntaddr);
510 gettimeofday(&t_saved, NULL);
511
512 if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) {
513 yp_error("rejected update request from unauthorized host");
514 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED);
515 return(&result);
516 }
517
518 /*
519 * Step one: find the user. (It's kinda pointless to
520 * proceed if the user doesn't exist.) We look for the
521 * user in the master.passwd.byname database, _NOT_ by
522 * using getpwent() and friends! We can't use getpwent()
523 * since the NIS master server is not guaranteed to be
524 * configured as an NIS client.
525 */
526
527 if (multidomain) {
528 if ((domain = find_domain(&argp->newpw)) == NULL) {
529 yp_error("multidomain lookup failed - aborting update");
530 return(&result);
531 } else
532 yp_error("updating user %s in domain %s",
533 argp->newpw.pw_name, domain);
534 }
535
536 key.data = argp->newpw.pw_name;
537 key.size = strlen(argp->newpw.pw_name);
538
539 if ((rval = yp_get_record(domain,"master.passwd.byname",
540 &key, &data, 0)) != YP_TRUE) {
541 if (rval == YP_NOKEY) {
542 yp_error("user %s not found in passwd database",
543 argp->newpw.pw_name);
544 } else {
545 yp_error("database access error: %s",
546 yperr_string(rval));
547 }
548 return(&result);
549 }
550
551 /* Nul terminate, please. */
552 *((char *)data.data + data.size) = '\0';
553
554 copy_yp_pass(data.data, 1, data.size);
555
556 /* Step 2: check that the supplied oldpass is valid. */
557
558 cryptpw = crypt(argp->oldpass, yp_password.pw_passwd);
559 if (cryptpw == NULL || strcmp(cryptpw, yp_password.pw_passwd)) {
560 yp_error("rejected change attempt -- bad password");
561 yp_error("client address: %s username: %s",
562 inet_ntoa(rqhost->sin_addr),
563 argp->newpw.pw_name);
564 return(&result);
565 }
566
567 /* Step 3: validate the arguments passed to us by the client. */
568
569 if (validate(&yp_password, &argp->newpw)) {
570 yp_error("rejecting change attempt: bad arguments");
571 yp_error("client address: %s username: %s",
572 inet_ntoa(rqhost->sin_addr),
573 argp->newpw.pw_name);
574 svcerr_decode(rqstp->rq_xprt);
575 return(&result);
576 }
577
578 /* Step 4: update the user's passwd structure. */
579
580 if (!no_chsh && strcmp(argp->newpw.pw_shell, yp_password.pw_shell)) {
581 oldshell = yp_password.pw_shell;
582 yp_password.pw_shell = argp->newpw.pw_shell;
583 shell_changed++;
584 }
585
586
587 if (!no_chfn && strcmp(argp->newpw.pw_gecos, yp_password.pw_gecos)) {
588 oldgecos = yp_password.pw_gecos;
589 yp_password.pw_gecos = argp->newpw.pw_gecos;
590 gecos_changed++;
591 }
592
593 if (strcmp(argp->newpw.pw_passwd, yp_password.pw_passwd)) {
594 yp_password.pw_passwd = argp->newpw.pw_passwd;
595 yp_password.pw_change = 0;
596 passwd_changed++;
597 }
598
599 /*
600 * If the caller specified a domain other than our 'default'
601 * domain, change the path to master.passwd accordingly.
602 */
603
604 if (strcmp(domain, yppasswd_domain)) {
605 snprintf(passfile_buf, sizeof(passfile_buf),
606 "%s/%s/master.passwd", yp_dir, domain);
607 passfile = (char *)&passfile_buf;
608 }
609
610 /*
611 * Create a filename to hold the original master.passwd
612 * so if our call to yppwupdate fails we can roll back
613 */
614 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf),
615 "%s.hold", passfile);
616 passfile_hold = (char *)&passfile_hold_buf;
617
618
619 /* Step 5: make a new password file with the updated info. */
620
621 snprintf(passdir_buf, sizeof(passdir_buf), "%s", passfile);
622 passdir = dirname(passdir_buf);
623
624 if (pw_init(passdir, passfile)) {
625 yp_error("pw_init() failed");
626 return &result;
627 }
628 if ((pfd = pw_lock()) == -1) {
629 pw_fini();
630 yp_error("pw_lock() failed");
631 return &result;
632 }
633 if ((tfd = pw_tmp(-1)) == -1) {
634 pw_fini();
635 yp_error("pw_tmp() failed");
636 return &result;
637 }
638 if (pw_copy(pfd, tfd, &yp_password, NULL) == -1) {
639 pw_fini();
640 yp_error("pw_copy() failed");
641 return &result;
642 }
643 if (rename(passfile, passfile_hold) == -1) {
644 pw_fini();
645 yp_error("rename of %s to %s failed", passfile,
646 passfile_hold);
647 return &result;
648 }
649
650 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) {
651 /*
652 * NIS server is exporting the system's master.passwd.
653 * Call pw_mkdb to rebuild passwd and the .db files
654 */
655 if (pw_mkdb(yp_password.pw_name) == -1) {
656 pw_fini();
657 yp_error("pw_mkdb() failed");
658 rename(passfile_hold, passfile);
659 return &result;
660 }
661 } else {
662 /*
663 * NIS server is exporting a private master.passwd.
664 * Rename tempfile into final location
665 */
666 if (rename(pw_tempname(), passfile) == -1) {
667 pw_fini();
668 yp_error("rename of %s to %s failed",
669 pw_tempname(), passfile);
670 rename(passfile_hold, passfile);
671 return &result;
672 }
673 }
674
675 pw_fini();
676
677 if (inplace) {
678 if ((rval = update_inplace(&yp_password, domain))) {
679 yp_error("inplace update failed -- rebuilding maps");
680 }
681 }
682
683 switch ((pid = fork())) {
684 case 0:
685 if (inplace && !rval) {
686 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
687 yppasswd_domain, "pushpw", (char *)NULL);
688 } else {
689 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
690 yppasswd_domain, (char *)NULL);
691 }
692 yp_error("couldn't exec map update process: %s",
693 strerror(errno));
694 unlink(passfile);
695 rename(passfile_hold, passfile);
696 exit(1);
697 break;
698 case -1:
699 yp_error("fork() failed: %s", strerror(errno));
700 unlink(passfile);
701 rename(passfile_hold, passfile);
702 return(&result);
703 break;
704 default:
705 unlink(passfile_hold);
706 break;
707 }
708
709 if (verbose) {
710 yp_error("update completed for user %s (uid %d) in %s:",
711 argp->newpw.pw_name, argp->newpw.pw_uid, passfile);
712
713 if (passwd_changed)
714 yp_error("password changed");
715
716 if (gecos_changed)
717 yp_error("gecos changed ('%s' -> '%s')",
718 oldgecos, argp->newpw.pw_gecos);
719
720 if (shell_changed)
721 yp_error("shell changed ('%s' -> '%s')",
722 oldshell, argp->newpw.pw_shell);
723 }
724
725 result = 0;
726 return (&result);
727 }
728
729 /*
730 * Note that this function performs a little less sanity checking
731 * than the last one. Since only the superuser is allowed to use it,
732 * it is assumed that the caller knows what he's doing.
733 */
734 int *
yppasswdproc_update_master_1_svc(master_yppasswd * argp,struct svc_req * rqstp)735 yppasswdproc_update_master_1_svc(master_yppasswd *argp,
736 struct svc_req *rqstp)
737 {
738 static int result;
739 int pfd, tfd;
740 int pid;
741 uid_t uid;
742 int rval = 0;
743 DBT key, data;
744 char *passdir;
745 char *passfile_hold;
746 char passdir_buf[MAXPATHLEN + 2];
747 char passfile_buf[MAXPATHLEN + 2];
748 char passfile_hold_buf[MAXPATHLEN + 2];
749 struct sockaddr_in *rqhost;
750 SVCXPRT *transp;
751 struct passwd newpasswd;
752
753 result = 1;
754 transp = rqstp->rq_xprt;
755
756 /*
757 * NO AF_INET CONNETCIONS ALLOWED!
758 */
759 rqhost = svc_getcaller(transp);
760 if (rqhost->sin_family != AF_UNIX) {
761 yp_error("Alert! %s/%d attempted to use superuser-only \
762 procedure!\n", inet_ntoa(rqhost->sin_addr), rqhost->sin_port);
763 svcerr_auth(transp, AUTH_BADCRED);
764 return(&result);
765 }
766
767 if (rqstp->rq_cred.oa_flavor != AUTH_SYS) {
768 yp_error("caller didn't send proper credentials");
769 svcerr_auth(transp, AUTH_BADCRED);
770 return(&result);
771 }
772
773 if (__rpc_get_local_uid(transp, &uid) < 0) {
774 yp_error("caller didn't send proper credentials");
775 svcerr_auth(transp, AUTH_BADCRED);
776 return(&result);
777 }
778
779 if (uid) {
780 yp_error("caller euid is %d, expecting 0 -- rejecting request",
781 uid);
782 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED);
783 return(&result);
784 }
785
786 passfile = passfile_default;
787
788 key.data = argp->newpw.pw_name;
789 key.size = strlen(argp->newpw.pw_name);
790
791 /*
792 * The superuser may add entries to the passwd maps if
793 * rpc.yppasswdd is started with the -a flag. Paranoia
794 * prevents me from allowing additions by default.
795 */
796 if ((rval = yp_get_record(argp->domain, "master.passwd.byname",
797 &key, &data, 0)) != YP_TRUE) {
798 if (rval == YP_NOKEY) {
799 yp_error("user %s not found in passwd database",
800 argp->newpw.pw_name);
801 if (allow_additions)
802 yp_error("notice: adding user %s to \
803 master.passwd database for domain %s", argp->newpw.pw_name, argp->domain);
804 else
805 yp_error("restart rpc.yppasswdd with the -a flag to \
806 allow additions to be made to the password database");
807 } else {
808 yp_error("database access error: %s",
809 yperr_string(rval));
810 }
811 if (!allow_additions)
812 return(&result);
813 } else {
814
815 /* Nul terminate, please. */
816 *((char *)data.data + data.size) = '\0';
817
818 copy_yp_pass(data.data, 1, data.size);
819 }
820
821 /*
822 * Perform a small bit of sanity checking.
823 */
824 if (validate_master(rval == YP_TRUE ? &yp_password:NULL,&argp->newpw)){
825 yp_error("rejecting update attempt for %s: bad arguments",
826 argp->newpw.pw_name);
827 return(&result);
828 }
829
830 /*
831 * If the caller specified a domain other than our 'default'
832 * domain, change the path to master.passwd accordingly.
833 */
834
835 if (strcmp(argp->domain, yppasswd_domain)) {
836 snprintf(passfile_buf, sizeof(passfile_buf),
837 "%s/%s/master.passwd", yp_dir, argp->domain);
838 passfile = (char *)&passfile_buf;
839 }
840
841 /*
842 * Create a filename to hold the original master.passwd
843 * so if our call to yppwupdate fails we can roll back
844 */
845 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf),
846 "%s.hold", passfile);
847 passfile_hold = (char *)&passfile_hold_buf;
848
849 snprintf(passdir_buf, sizeof(passdir_buf), "%s", passfile);
850 passdir = dirname(passdir_buf);
851
852 if (pw_init(passdir, passfile)) {
853 yp_error("pw_init() failed");
854 return &result;
855 }
856 if ((pfd = pw_lock()) == -1) {
857 pw_fini();
858 yp_error("pw_lock() failed");
859 return &result;
860 }
861 if ((tfd = pw_tmp(-1)) == -1) {
862 pw_fini();
863 yp_error("pw_tmp() failed");
864 return &result;
865 }
866 xlate_passwd(&argp->newpw, &newpasswd);
867 if (pw_copy(pfd, tfd, &newpasswd, NULL) == -1) {
868 pw_fini();
869 yp_error("pw_copy() failed");
870 return &result;
871 }
872 if (rename(passfile, passfile_hold) == -1) {
873 pw_fini();
874 yp_error("rename of %s to %s failed", passfile,
875 passfile_hold);
876 return &result;
877 }
878 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) {
879 /*
880 * NIS server is exporting the system's master.passwd.
881 * Call pw_mkdb to rebuild passwd and the .db files
882 */
883 if (pw_mkdb(argp->newpw.pw_name) == -1) {
884 pw_fini();
885 yp_error("pw_mkdb() failed");
886 rename(passfile_hold, passfile);
887 return &result;
888 }
889 } else {
890 /*
891 * NIS server is exporting a private master.passwd.
892 * Rename tempfile into final location
893 */
894 if (rename(pw_tempname(), passfile) == -1) {
895 pw_fini();
896 yp_error("rename of %s to %s failed",
897 pw_tempname(), passfile);
898 rename(passfile_hold, passfile);
899 return &result;
900 }
901 }
902 pw_fini();
903
904 if (inplace) {
905 xlate_passwd(&argp->newpw, &newpasswd);
906 if ((rval = update_inplace(&newpasswd, argp->domain))) {
907 yp_error("inplace update failed -- rebuilding maps");
908 }
909 }
910
911 switch ((pid = fork())) {
912 case 0:
913 if (inplace && !rval) {
914 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
915 argp->domain, "pushpw", (char *)NULL);
916 } else {
917 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
918 argp->domain, (char *)NULL);
919 }
920 yp_error("couldn't exec map update process: %s",
921 strerror(errno));
922 unlink(passfile);
923 rename(passfile_hold, passfile);
924 exit(1);
925 break;
926 case -1:
927 yp_error("fork() failed: %s", strerror(errno));
928 unlink(passfile);
929 rename(passfile_hold, passfile);
930 return(&result);
931 break;
932 default:
933 unlink(passfile_hold);
934 break;
935 }
936
937 yp_error("performed update of user %s (uid %d) domain %s",
938 argp->newpw.pw_name,
939 argp->newpw.pw_uid,
940 argp->domain);
941
942 result = 0;
943 return(&result);
944 }
945