1 /*
2 * Copyright (c) 1995, 1996
3 * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Bill Paul.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $FreeBSD: src/usr.sbin/rpc.yppasswdd/yppasswdd_server.c,v 1.29 2003/06/15 21:24:45 mbr Exp $
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
copy_yp_pass(char * p,int x,int m)72 copy_yp_pass(char *p, int x, int m)
73 {
74 char *t, *s = p;
75 static char *buf;
76
77 yp_password.pw_fields = 0;
78
79 buf = realloc(buf, m + 10);
80 bzero(buf, m + 10);
81
82 /* Turn all colons into NULLs */
83 while (strchr(s, ':')) {
84 s = (strchr(s, ':') + 1);
85 *(s - 1)= '\0';
86 }
87
88 t = buf;
89 #define EXPAND(e) e = t; while ((*t++ = *p++));
90 EXPAND(yp_password.pw_name);
91 yp_password.pw_fields |= _PWF_NAME;
92 EXPAND(yp_password.pw_passwd);
93 yp_password.pw_fields |= _PWF_PASSWD;
94 yp_password.pw_uid = atoi(p);
95 p += (strlen(p) + 1);
96 yp_password.pw_fields |= _PWF_UID;
97 yp_password.pw_gid = atoi(p);
98 p += (strlen(p) + 1);
99 yp_password.pw_fields |= _PWF_GID;
100 if (x) {
101 EXPAND(yp_password.pw_class);
102 yp_password.pw_fields |= _PWF_CLASS;
103 yp_password.pw_change = atol(p);
104 p += (strlen(p) + 1);
105 yp_password.pw_fields |= _PWF_CHANGE;
106 yp_password.pw_expire = atol(p);
107 p += (strlen(p) + 1);
108 yp_password.pw_fields |= _PWF_EXPIRE;
109 }
110 EXPAND(yp_password.pw_gecos);
111 yp_password.pw_fields |= _PWF_GECOS;
112 EXPAND(yp_password.pw_dir);
113 yp_password.pw_fields |= _PWF_DIR;
114 EXPAND(yp_password.pw_shell);
115 yp_password.pw_fields |= _PWF_SHELL;
116
117 return;
118 }
119
120 static int
validchars(char * arg)121 validchars(char *arg)
122 {
123 size_t i;
124
125 for (i = 0; i < strlen(arg); i++) {
126 if (iscntrl(arg[i])) {
127 yp_error("string contains a control character");
128 return(1);
129 }
130 if (arg[i] == ':') {
131 yp_error("string contains a colon");
132 return(1);
133 }
134 /* Be evil: truncate strings with \n in them silently. */
135 if (arg[i] == '\n') {
136 arg[i] = '\0';
137 return(0);
138 }
139 }
140 return(0);
141 }
142
143 static int
validate_master(struct passwd * opw __unused,struct x_master_passwd * npw)144 validate_master(struct passwd *opw __unused, struct x_master_passwd *npw)
145 {
146
147 if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') {
148 yp_error("client tried to modify an NIS entry");
149 return(1);
150 }
151
152 if (validchars(npw->pw_shell)) {
153 yp_error("specified shell contains invalid characters");
154 return(1);
155 }
156
157 if (validchars(npw->pw_gecos)) {
158 yp_error("specified gecos field contains invalid characters");
159 return(1);
160 }
161
162 if (validchars(npw->pw_passwd)) {
163 yp_error("specified password contains invalid characters");
164 return(1);
165 }
166 return(0);
167 }
168
169 static int
validate(struct passwd * opw,struct x_passwd * npw)170 validate(struct passwd *opw, struct x_passwd *npw)
171 {
172
173 if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') {
174 yp_error("client tried to modify an NIS entry");
175 return(1);
176 }
177
178 if ((uid_t)npw->pw_uid != opw->pw_uid) {
179 yp_error("UID mismatch: client says user %s has UID %d",
180 npw->pw_name, npw->pw_uid);
181 yp_error("database says user %s has UID %d", opw->pw_name,
182 opw->pw_uid);
183 return(1);
184 }
185
186 if ((gid_t)npw->pw_gid != opw->pw_gid) {
187 yp_error("GID mismatch: client says user %s has GID %d",
188 npw->pw_name, npw->pw_gid);
189 yp_error("database says user %s has GID %d", opw->pw_name,
190 opw->pw_gid);
191 return(1);
192 }
193
194 /*
195 * Don't allow the user to shoot himself in the foot,
196 * even on purpose.
197 */
198 if (!ok_shell(npw->pw_shell)) {
199 yp_error("%s is not a valid shell", npw->pw_shell);
200 return(1);
201 }
202
203 if (validchars(npw->pw_shell)) {
204 yp_error("specified shell contains invalid characters");
205 return(1);
206 }
207
208 if (validchars(npw->pw_gecos)) {
209 yp_error("specified gecos field contains invalid characters");
210 return(1);
211 }
212
213 if (validchars(npw->pw_passwd)) {
214 yp_error("specified password contains invalid characters");
215 return(1);
216 }
217 return(0);
218 }
219
220 /*
221 * Kludge alert:
222 * In order to have one rpc.yppasswdd support multiple domains,
223 * we have to cheat: we search each directory under /var/yp
224 * and try to match the user in each master.passwd.byname
225 * map that we find. If the user matches (username, uid and gid
226 * all agree), then we use that domain. If we match the user in
227 * more than one database, we must abort.
228 */
229 static char *
find_domain(struct x_passwd * pw)230 find_domain(struct x_passwd *pw)
231 {
232 struct stat statbuf;
233 struct dirent *dirp;
234 DIR *dird;
235 char yp_mapdir[MAXPATHLEN + 2];
236 static char domain[YPMAXDOMAIN];
237 char *tmp = NULL;
238 DBT key, data;
239 int hit = 0;
240
241 yp_error("performing multidomain lookup");
242
243 if ((dird = opendir(yp_dir)) == NULL) {
244 yp_error("opendir(%s) failed: %s", yp_dir, strerror(errno));
245 return(NULL);
246 }
247
248 while ((dirp = readdir(dird)) != NULL) {
249 snprintf(yp_mapdir, sizeof yp_mapdir, "%s/%s",
250 yp_dir, dirp->d_name);
251 if (stat(yp_mapdir, &statbuf) < 0) {
252 yp_error("stat(%s) failed: %s", yp_mapdir,
253 strerror(errno));
254 closedir(dird);
255 return(NULL);
256 }
257 if (S_ISDIR(statbuf.st_mode)) {
258 tmp = (char *)dirp->d_name;
259 key.data = pw->pw_name;
260 key.size = strlen(pw->pw_name);
261
262 if (yp_get_record(tmp,"master.passwd.byname",
263 &key, &data, 0) != YP_TRUE) {
264 continue;
265 }
266 *((char *)data.data + data.size) = '\0';
267 copy_yp_pass(data.data, 1, data.size);
268 if (yp_password.pw_uid == (uid_t)pw->pw_uid &&
269 yp_password.pw_gid == (gid_t)pw->pw_gid) {
270 hit++;
271 snprintf(domain, YPMAXDOMAIN, "%s", tmp);
272 }
273 }
274 }
275
276 closedir(dird);
277 if (hit > 1) {
278 yp_error("found same user in two different domains");
279 return(NULL);
280 } else
281 return((char *)&domain);
282 }
283
284 static const char *maps[] = {
285 "master.passwd.byname",
286 "master.passwd.byuid",
287 "passwd.byname",
288 "passwd.byuid"
289 };
290
291 static const char *formats[] = {
292 "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s",
293 "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s",
294 "%s:%s:%d:%d:%s:%s:%s",
295 "%s:%s:%d:%d:%s:%s:%s"
296 };
297
298 static int
update_inplace(struct passwd * pw,char * domain)299 update_inplace(struct passwd *pw, char *domain)
300 {
301 DB *dbp = NULL;
302 DBT key = { NULL, 0 };
303 DBT data = { NULL, 0 };
304 char pwbuf[YPMAXRECORD];
305 char keybuf[20];
306 int i;
307 char *ptr = NULL;
308 static char yp_last[] = "YP_LAST_MODIFIED";
309 char yplastbuf[YPMAXRECORD];
310
311 snprintf(yplastbuf, sizeof yplastbuf, "%llu",
312 (unsigned long long)time(NULL));
313
314 for (i = 0; i < 4; i++) {
315
316 if (i % 2) {
317 snprintf(keybuf, sizeof keybuf,
318 "%llu", (unsigned long long)pw->pw_uid);
319 key.data = &keybuf;
320 key.size = strlen(keybuf);
321 } else {
322 key.data = pw->pw_name;
323 key.size = strlen(pw->pw_name);
324 }
325
326 /*
327 * XXX The passwd.byname and passwd.byuid maps come in
328 * two flavors: secure and insecure. The secure version
329 * has a '*' in the password field whereas the insecure one
330 * has a real crypted password. The maps will be insecure
331 * if they were built with 'unsecure = TRUE' enabled in
332 * /var/yp/Makefile, but we'd have no way of knowing if
333 * this has been done unless we were to try parsing the
334 * Makefile, which is a disgusting thought. Instead, we
335 * read the records from the maps, skip to the first ':'
336 * in them, and then look at the character immediately
337 * following it. If it's an '*' then the map is 'secure'
338 * and we must not insert a real password into the pw_passwd
339 * field. If it's not an '*', then we put the real crypted
340 * password in.
341 */
342 if (yp_get_record(domain,maps[i],&key,&data,1) != YP_TRUE) {
343 yp_error("couldn't read %s/%s: %s", domain,
344 maps[i], strerror(errno));
345 return(1);
346 }
347
348 if ((ptr = strchr(data.data, ':')) == NULL) {
349 yp_error("no colon in passwd record?!");
350 return(1);
351 }
352
353 /*
354 * XXX Supposing we have more than one user with the same
355 * UID? (Or more than one user with the same name?) We could
356 * end up modifying the wrong record if were not careful.
357 */
358 if (i % 2) {
359 if (strncmp(data.data, pw->pw_name,
360 strlen(pw->pw_name))) {
361 yp_error("warning: found entry for UID %d "
362 "in map %s@%s with wrong name (%.*s)",
363 pw->pw_uid, maps[i], domain,
364 (int)(ptr - (char *)data.data),
365 (char *)data.data);
366 yp_error("there may be more than one user "
367 "with the same UID - continuing");
368 continue;
369 }
370 } else {
371 /*
372 * We're really being ultra-paranoid here.
373 * This is generally a 'can't happen' condition.
374 */
375 snprintf(pwbuf, sizeof pwbuf, ":%d:%d:", pw->pw_uid,
376 pw->pw_gid);
377 if (!strstr(data.data, pwbuf)) {
378 yp_error("warning: found entry for user %s \
379 in map %s@%s with wrong UID", pw->pw_name, maps[i], domain);
380 yp_error("there may be more than one user \
381 with the same name - continuing");
382 continue;
383 }
384 }
385
386 if (i < 2) {
387 snprintf(pwbuf, sizeof pwbuf, formats[i],
388 pw->pw_name, pw->pw_passwd, pw->pw_uid,
389 pw->pw_gid, pw->pw_class, pw->pw_change,
390 pw->pw_expire, pw->pw_gecos, pw->pw_dir,
391 pw->pw_shell);
392 } else {
393 snprintf(pwbuf, sizeof pwbuf, formats[i],
394 pw->pw_name, *(ptr+1) == '*' ? "*" : pw->pw_passwd,
395 pw->pw_uid, pw->pw_gid, pw->pw_gecos, pw->pw_dir,
396 pw->pw_shell);
397 }
398
399 #define FLAGS O_RDWR|O_CREAT
400
401 if ((dbp = yp_open_db_rw(domain, maps[i], FLAGS)) == NULL) {
402 yp_error("couldn't open %s/%s r/w: %s",domain,
403 maps[i],strerror(errno));
404 return(1);
405 }
406
407 data.data = pwbuf;
408 data.size = strlen(pwbuf);
409
410 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) {
411 yp_error("failed to update record in %s/%s", domain,
412 maps[i]);
413 (dbp->close)(dbp);
414 return(1);
415 }
416
417 key.data = yp_last;
418 key.size = strlen(yp_last);
419 data.data = (char *)&yplastbuf;
420 data.size = strlen(yplastbuf);
421
422 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) {
423 yp_error("failed to update timestamp in %s/%s", domain,
424 maps[i]);
425 (dbp->close)(dbp);
426 return(1);
427 }
428
429 (dbp->close)(dbp);
430 }
431
432 return(0);
433 }
434
435 int *
yppasswdproc_update_1_svc(yppasswd * argp,struct svc_req * rqstp)436 yppasswdproc_update_1_svc(yppasswd *argp, struct svc_req *rqstp)
437 {
438 static int result;
439 struct sockaddr_in *rqhost;
440 DBT key, data;
441 int rval = 0;
442 int pfd, tfd;
443 int pid;
444 int passwd_changed = 0;
445 int shell_changed = 0;
446 int gecos_changed = 0;
447 char *oldshell = NULL;
448 char *oldgecos = NULL;
449 char *passfile_hold;
450 char passfile_buf[MAXPATHLEN + 2];
451 char passfile_hold_buf[MAXPATHLEN + 2];
452 char *domain = yppasswd_domain;
453 char *cryptpw;
454 static struct sockaddr_in clntaddr;
455 static struct timeval t_saved, t_test;
456
457 /*
458 * Normal user updates always use the 'default' master.passwd file.
459 */
460
461 passfile = passfile_default;
462 result = 1;
463
464 rqhost = svc_getcaller(rqstp->rq_xprt);
465
466 gettimeofday(&t_test, NULL);
467 if (!bcmp(rqhost, &clntaddr, sizeof *rqhost) &&
468 t_test.tv_sec > t_saved.tv_sec &&
469 t_test.tv_sec - t_saved.tv_sec < 300) {
470
471 bzero(&clntaddr, sizeof clntaddr);
472 bzero(&t_saved, sizeof t_saved);
473 return(NULL);
474 }
475
476 bcopy(rqhost, &clntaddr, sizeof clntaddr);
477 gettimeofday(&t_saved, NULL);
478
479 if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) {
480 yp_error("rejected update request from unauthorized host");
481 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED);
482 return(&result);
483 }
484
485 /*
486 * Step one: find the user. (It's kinda pointless to
487 * proceed if the user doesn't exist.) We look for the
488 * user in the master.passwd.byname database, _NOT_ by
489 * using getpwent() and friends! We can't use getpwent()
490 * since the NIS master server is not guaranteed to be
491 * configured as an NIS client.
492 */
493
494 if (multidomain) {
495 if ((domain = find_domain(&argp->newpw)) == NULL) {
496 yp_error("multidomain lookup failed - aborting update");
497 return(&result);
498 } else
499 yp_error("updating user %s in domain %s",
500 argp->newpw.pw_name, domain);
501 }
502
503 key.data = argp->newpw.pw_name;
504 key.size = strlen(argp->newpw.pw_name);
505
506 if ((rval = yp_get_record(domain,"master.passwd.byname",
507 &key, &data, 0)) != YP_TRUE) {
508 if (rval == YP_NOKEY) {
509 yp_error("user %s not found in passwd database",
510 argp->newpw.pw_name);
511 } else {
512 yp_error("database access error: %s",
513 yperr_string(rval));
514 }
515 return(&result);
516 }
517
518 /* Nul terminate, please. */
519 *((char *)data.data + data.size) = '\0';
520
521 copy_yp_pass(data.data, 1, data.size);
522
523 /* Step 2: check that the supplied oldpass is valid. */
524
525 cryptpw = crypt(argp->oldpass, yp_password.pw_passwd);
526
527 if (cryptpw == NULL || strcmp(cryptpw, yp_password.pw_passwd) != 0) {
528 yp_error("rejected change attempt -- bad password");
529 yp_error("client address: %s username: %s",
530 inet_ntoa(rqhost->sin_addr),
531 argp->newpw.pw_name);
532 return(&result);
533 }
534
535 /* Step 3: validate the arguments passed to us by the client. */
536
537 if (validate(&yp_password, &argp->newpw)) {
538 yp_error("rejecting change attempt: bad arguments");
539 yp_error("client address: %s username: %s",
540 inet_ntoa(rqhost->sin_addr),
541 argp->newpw.pw_name);
542 svcerr_decode(rqstp->rq_xprt);
543 return(&result);
544 }
545
546 /* Step 4: update the user's passwd structure. */
547
548 if (!no_chsh && strcmp(argp->newpw.pw_shell, yp_password.pw_shell)) {
549 oldshell = yp_password.pw_shell;
550 yp_password.pw_shell = argp->newpw.pw_shell;
551 shell_changed++;
552 }
553
554
555 if (!no_chfn && strcmp(argp->newpw.pw_gecos, yp_password.pw_gecos)) {
556 oldgecos = yp_password.pw_gecos;
557 yp_password.pw_gecos = argp->newpw.pw_gecos;
558 gecos_changed++;
559 }
560
561 if (strcmp(argp->newpw.pw_passwd, yp_password.pw_passwd)) {
562 yp_password.pw_passwd = argp->newpw.pw_passwd;
563 yp_password.pw_change = 0;
564 passwd_changed++;
565 }
566
567 /*
568 * If the caller specified a domain other than our 'default'
569 * domain, change the path to master.passwd accordingly.
570 */
571
572 if (strcmp(domain, yppasswd_domain)) {
573 snprintf(passfile_buf, sizeof(passfile_buf),
574 "%s/%s/master.passwd", yp_dir, domain);
575 passfile = (char *)&passfile_buf;
576 }
577
578 /*
579 * Create a filename to hold the original master.passwd
580 * so if our call to yppwupdate fails we can roll back
581 */
582 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf),
583 "%s.hold", passfile);
584 passfile_hold = (char *)&passfile_hold_buf;
585
586
587 /* Step 5: make a new password file with the updated info. */
588
589 if (pw_init(dirname(passfile), passfile)) {
590 yp_error("pw_init() failed");
591 return &result;
592 }
593 if ((pfd = pw_lock()) == -1) {
594 pw_fini();
595 yp_error("pw_lock() failed");
596 return &result;
597 }
598 if ((tfd = pw_tmp(-1)) == -1) {
599 pw_fini();
600 yp_error("pw_tmp() failed");
601 return &result;
602 }
603 if (pw_copy(pfd, tfd, &yp_password, NULL) == -1) {
604 pw_fini();
605 yp_error("pw_copy() failed");
606 return &result;
607 }
608 if (rename(passfile, passfile_hold) == -1) {
609 pw_fini();
610 yp_error("rename of %s to %s failed", passfile,
611 passfile_hold);
612 return &result;
613 }
614
615 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) {
616 /*
617 * NIS server is exporting the system's master.passwd.
618 * Call pw_mkdb to rebuild passwd and the .db files
619 */
620 if (pw_mkdb(yp_password.pw_name) == -1) {
621 pw_fini();
622 yp_error("pw_mkdb() failed");
623 rename(passfile_hold, passfile);
624 return &result;
625 }
626 } else {
627 /*
628 * NIS server is exporting a private master.passwd.
629 * Rename tempfile into final location
630 */
631 if (rename(pw_tempname(), passfile) == -1) {
632 pw_fini();
633 yp_error("rename of %s to %s failed",
634 pw_tempname(), passfile);
635 rename(passfile_hold, passfile);
636 return &result;
637 }
638 }
639
640 pw_fini();
641
642 if (inplace) {
643 if ((rval = update_inplace(&yp_password, domain))) {
644 yp_error("inplace update failed -- rebuilding maps");
645 }
646 }
647
648 switch ((pid = fork())) {
649 case 0:
650 if (inplace && !rval) {
651 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
652 yppasswd_domain, "pushpw", NULL);
653 } else {
654 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
655 yppasswd_domain, NULL);
656 }
657 yp_error("couldn't exec map update process: %s",
658 strerror(errno));
659 unlink(passfile);
660 rename(passfile_hold, passfile);
661 exit(1);
662 break;
663 case -1:
664 yp_error("fork() failed: %s", strerror(errno));
665 unlink(passfile);
666 rename(passfile_hold, passfile);
667 return(&result);
668 break;
669 default:
670 unlink(passfile_hold);
671 break;
672 }
673
674 if (verbose) {
675 yp_error("update completed for user %s (uid %d) in %s:",
676 argp->newpw.pw_name, argp->newpw.pw_uid, passfile);
677
678 if (passwd_changed)
679 yp_error("password changed");
680
681 if (gecos_changed)
682 yp_error("gecos changed ('%s' -> '%s')",
683 oldgecos, argp->newpw.pw_gecos);
684
685 if (shell_changed)
686 yp_error("shell changed ('%s' -> '%s')",
687 oldshell, argp->newpw.pw_shell);
688 }
689
690 result = 0;
691 return (&result);
692 }
693
694 /*
695 * Note that this function performs a little less sanity checking
696 * than the last one. Since only the superuser is allowed to use it,
697 * it is assumed that the caller knows what he's doing.
698 */
699 int *
yppasswdproc_update_master_1_svc(master_yppasswd * argp,struct svc_req * rqstp)700 yppasswdproc_update_master_1_svc(master_yppasswd *argp, struct svc_req *rqstp)
701 {
702 static int result;
703 int pfd, tfd;
704 int pid;
705 uid_t uid;
706 int rval = 0;
707 DBT key, data;
708 char *passfile_hold;
709 char passfile_buf[MAXPATHLEN + 2];
710 char passfile_hold_buf[MAXPATHLEN + 2];
711 struct sockaddr_in *rqhost;
712 SVCXPRT *transp;
713
714 result = 1;
715 transp = rqstp->rq_xprt;
716
717 /*
718 * NO AF_INET CONNETCIONS ALLOWED!
719 */
720 rqhost = svc_getcaller(transp);
721 if (rqhost->sin_family != AF_UNIX) {
722 yp_error("Alert! %s/%d attempted to use superuser-only \
723 procedure!\n", inet_ntoa(rqhost->sin_addr), rqhost->sin_port);
724 svcerr_auth(transp, AUTH_BADCRED);
725 return(&result);
726 }
727
728 if (rqstp->rq_cred.oa_flavor != AUTH_SYS) {
729 yp_error("caller didn't send proper credentials");
730 svcerr_auth(transp, AUTH_BADCRED);
731 return(&result);
732 }
733
734 if (__rpc_get_local_uid(transp, &uid) < 0) {
735 yp_error("caller didn't send proper credentials");
736 svcerr_auth(transp, AUTH_BADCRED);
737 return(&result);
738 }
739
740 if (uid) {
741 yp_error("caller euid is %d, expecting 0 -- rejecting request",
742 uid);
743 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED);
744 return(&result);
745 }
746
747 passfile = passfile_default;
748
749 key.data = argp->newpw.pw_name;
750 key.size = strlen(argp->newpw.pw_name);
751
752 /*
753 * The superuser may add entries to the passwd maps if
754 * rpc.yppasswdd is started with the -a flag. Paranoia
755 * prevents me from allowing additions by default.
756 */
757 if ((rval = yp_get_record(argp->domain, "master.passwd.byname",
758 &key, &data, 0)) != YP_TRUE) {
759 if (rval == YP_NOKEY) {
760 yp_error("user %s not found in passwd database",
761 argp->newpw.pw_name);
762 if (allow_additions)
763 yp_error("notice: adding user %s to \
764 master.passwd database for domain %s", argp->newpw.pw_name, argp->domain);
765 else
766 yp_error("restart rpc.yppasswdd with the -a flag to \
767 allow additions to be made to the password database");
768 } else {
769 yp_error("database access error: %s",
770 yperr_string(rval));
771 }
772 if (!allow_additions)
773 return(&result);
774 } else {
775
776 /* Nul terminate, please. */
777 *((char *)data.data + data.size) = '\0';
778
779 copy_yp_pass(data.data, 1, data.size);
780 }
781
782 /*
783 * Perform a small bit of sanity checking.
784 */
785 if (validate_master(rval == YP_TRUE ? &yp_password:NULL,&argp->newpw)){
786 yp_error("rejecting update attempt for %s: bad arguments",
787 argp->newpw.pw_name);
788 return(&result);
789 }
790
791 /*
792 * If the caller specified a domain other than our 'default'
793 * domain, change the path to master.passwd accordingly.
794 */
795
796 if (strcmp(argp->domain, yppasswd_domain)) {
797 snprintf(passfile_buf, sizeof(passfile_buf),
798 "%s/%s/master.passwd", yp_dir, argp->domain);
799 passfile = (char *)&passfile_buf;
800 }
801
802 /*
803 * Create a filename to hold the original master.passwd
804 * so if our call to yppwupdate fails we can roll back
805 */
806 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf),
807 "%s.hold", passfile);
808 passfile_hold = (char *)&passfile_hold_buf;
809
810 if (pw_init(dirname(passfile), passfile)) {
811 yp_error("pw_init() failed");
812 return &result;
813 }
814 if ((pfd = pw_lock()) == -1) {
815 pw_fini();
816 yp_error("pw_lock() failed");
817 return &result;
818 }
819 if ((tfd = pw_tmp(-1)) == -1) {
820 pw_fini();
821 yp_error("pw_tmp() failed");
822 return &result;
823 }
824 if (pw_copy(pfd, tfd, (struct passwd *)&argp->newpw, NULL) == -1) {
825 pw_fini();
826 yp_error("pw_copy() failed");
827 return &result;
828 }
829 if (rename(passfile, passfile_hold) == -1) {
830 pw_fini();
831 yp_error("rename of %s to %s failed", passfile,
832 passfile_hold);
833 return &result;
834 }
835 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) {
836 /*
837 * NIS server is exporting the system's master.passwd.
838 * Call pw_mkdb to rebuild passwd and the .db files
839 */
840 if (pw_mkdb(argp->newpw.pw_name) == -1) {
841 pw_fini();
842 yp_error("pw_mkdb() failed");
843 rename(passfile_hold, passfile);
844 return &result;
845 }
846 } else {
847 /*
848 * NIS server is exporting a private master.passwd.
849 * Rename tempfile into final location
850 */
851 if (rename(pw_tempname(), passfile) == -1) {
852 pw_fini();
853 yp_error("rename of %s to %s failed",
854 pw_tempname(), passfile);
855 rename(passfile_hold, passfile);
856 return &result;
857 }
858 }
859 pw_fini();
860
861 if (inplace) {
862 if ((rval = update_inplace((struct passwd *)&argp->newpw,
863 argp->domain))) {
864 yp_error("inplace update failed -- rebuilding maps");
865 }
866 }
867
868 switch ((pid = fork())) {
869 case 0:
870 if (inplace && !rval) {
871 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
872 argp->domain, "pushpw", NULL);
873 } else {
874 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
875 argp->domain, NULL);
876 }
877 yp_error("couldn't exec map update process: %s",
878 strerror(errno));
879 unlink(passfile);
880 rename(passfile_hold, passfile);
881 exit(1);
882 break;
883 case -1:
884 yp_error("fork() failed: %s", strerror(errno));
885 unlink(passfile);
886 rename(passfile_hold, passfile);
887 return(&result);
888 break;
889 default:
890 unlink(passfile_hold);
891 break;
892 }
893
894 yp_error("performed update of user %s (uid %d) domain %s",
895 argp->newpw.pw_name,
896 argp->newpw.pw_uid,
897 argp->domain);
898
899 result = 0;
900 return(&result);
901 }
902