]> CyberLeo.Net >> Repos - FreeBSD/stable/10.git/blob - usr.sbin/rpc.yppasswdd/yppasswdd_server.c
MFC r344245:
[FreeBSD/stable/10.git] / usr.sbin / rpc.yppasswdd / yppasswdd_server.c
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
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35
36 #include <sys/param.h>
37 #include <sys/fcntl.h>
38 #include <sys/socket.h>
39 #include <sys/stat.h>
40 #include <sys/wait.h>
41
42 #include <arpa/inet.h>
43 #include <netinet/in.h>
44
45 #include <ctype.h>
46 #include <db.h>
47 #include <dirent.h>
48 #include <errno.h>
49 #include <limits.h>
50 #include <pwd.h>
51 #include <signal.h>
52 #include <stdio.h>
53 #include <stdlib.h>
54 #include <string.h>
55 #include <unistd.h>
56
57 #include <libgen.h>
58 #include <libutil.h>
59
60 #include <rpc/rpc.h>
61 #include <rpcsvc/yp.h>
62 struct dom_binding;
63 #include <rpcsvc/ypclnt.h>
64 #include "yppasswdd_extern.h"
65 #include "yppasswd.h"
66 #include "yppasswd_private.h"
67 #include "ypxfr_extern.h"
68 #include "yp_extern.h"
69
70 static struct passwd yp_password;
71
72 static void
73 xlate_passwd(struct x_master_passwd *xpwd, struct passwd *pwd)
74 {
75         pwd->pw_name = xpwd->pw_name;
76         pwd->pw_passwd = xpwd->pw_passwd;
77         pwd->pw_uid = xpwd->pw_uid;
78         pwd->pw_gid = xpwd->pw_gid;
79         pwd->pw_change = xpwd->pw_change;
80         pwd->pw_class = xpwd->pw_class;
81         pwd->pw_gecos = xpwd->pw_gecos;
82         pwd->pw_dir = xpwd->pw_dir;
83         pwd->pw_shell = xpwd->pw_shell;
84         pwd->pw_expire = xpwd->pw_expire;
85         pwd->pw_fields = xpwd->pw_fields;
86 }
87
88 static void
89 copy_yp_pass(char *p, int x, int m)
90 {
91         char *t, *s = p;
92         static char *buf;
93
94         yp_password.pw_fields = 0;
95
96         buf = realloc(buf, m + 10);
97         bzero(buf, m + 10);
98
99         /* Turn all colons into NULLs */
100         while (strchr(s, ':')) {
101                 s = (strchr(s, ':') + 1);
102                 *(s - 1)= '\0';
103         }
104
105         t = buf;
106 #define EXPAND(e) do { \
107         e = t; \
108         while ((*t++ = *p++)); \
109 } while (0)
110         EXPAND(yp_password.pw_name);
111         yp_password.pw_fields |= _PWF_NAME;
112         EXPAND(yp_password.pw_passwd);
113         yp_password.pw_fields |= _PWF_PASSWD;
114         yp_password.pw_uid = atoi(p);
115         p += (strlen(p) + 1);
116         yp_password.pw_fields |= _PWF_UID;
117         yp_password.pw_gid = atoi(p);
118         p += (strlen(p) + 1);
119         yp_password.pw_fields |= _PWF_GID;
120         if (x) {
121                 EXPAND(yp_password.pw_class);
122                 yp_password.pw_fields |= _PWF_CLASS;
123                 yp_password.pw_change = atol(p);
124                 p += (strlen(p) + 1);
125                 yp_password.pw_fields |= _PWF_CHANGE;
126                 yp_password.pw_expire = atol(p);
127                 p += (strlen(p) + 1);
128                 yp_password.pw_fields |= _PWF_EXPIRE;
129         }
130         EXPAND(yp_password.pw_gecos);
131         yp_password.pw_fields |= _PWF_GECOS;
132         EXPAND(yp_password.pw_dir);
133         yp_password.pw_fields |= _PWF_DIR;
134         EXPAND(yp_password.pw_shell);
135         yp_password.pw_fields |= _PWF_SHELL;
136
137         return;
138 }
139
140 static int
141 validchars(char *arg)
142 {
143         size_t i;
144
145         for (i = 0; i < strlen(arg); i++) {
146                 if (iscntrl(arg[i])) {
147                         yp_error("string contains a control character");
148                         return(1);
149                 }
150                 if (arg[i] == ':') {
151                         yp_error("string contains a colon");
152                         return(1);
153                 }
154                 /* Be evil: truncate strings with \n in them silently. */
155                 if (arg[i] == '\n') {
156                         arg[i] = '\0';
157                         return(0);
158                 }
159         }
160         return(0);
161 }
162
163 static int
164 validate_master(struct passwd *opw __unused, struct x_master_passwd *npw)
165 {
166
167         if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') {
168                 yp_error("client tried to modify an NIS entry");
169                 return(1);
170         }
171
172         if (validchars(npw->pw_shell)) {
173                 yp_error("specified shell contains invalid characters");
174                 return(1);
175         }
176
177         if (validchars(npw->pw_gecos)) {
178                 yp_error("specified gecos field contains invalid characters");
179                 return(1);
180         }
181
182         if (validchars(npw->pw_passwd)) {
183                 yp_error("specified password contains invalid characters");
184                 return(1);
185         }
186         return(0);
187 }
188
189 static int
190 validate(struct passwd *opw, struct x_passwd *npw)
191 {
192
193         if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') {
194                 yp_error("client tried to modify an NIS entry");
195                 return(1);
196         }
197
198         if ((uid_t)npw->pw_uid != opw->pw_uid) {
199                 yp_error("UID mismatch: client says user %s has UID %d",
200                          npw->pw_name, npw->pw_uid);
201                 yp_error("database says user %s has UID %d", opw->pw_name,
202                          opw->pw_uid);
203                 return(1);
204         }
205
206         if ((gid_t)npw->pw_gid != opw->pw_gid) {
207                 yp_error("GID mismatch: client says user %s has GID %d",
208                          npw->pw_name, npw->pw_gid);
209                 yp_error("database says user %s has GID %d", opw->pw_name,
210                          opw->pw_gid);
211                 return(1);
212         }
213
214         /*
215          * Don't allow the user to shoot himself in the foot,
216          * even on purpose.
217          */
218         if (!ok_shell(npw->pw_shell)) {
219                 yp_error("%s is not a valid shell", npw->pw_shell);
220                 return(1);
221         }
222
223         if (validchars(npw->pw_shell)) {
224                 yp_error("specified shell contains invalid characters");
225                 return(1);
226         }
227
228         if (validchars(npw->pw_gecos)) {
229                 yp_error("specified gecos field contains invalid characters");
230                 return(1);
231         }
232
233         if (validchars(npw->pw_passwd)) {
234                 yp_error("specified password contains invalid characters");
235                 return(1);
236         }
237         return(0);
238 }
239
240 /*
241  * Kludge alert:
242  * In order to have one rpc.yppasswdd support multiple domains,
243  * we have to cheat: we search each directory under /var/yp
244  * and try to match the user in each master.passwd.byname
245  * map that we find. If the user matches (username, uid and gid
246  * all agree), then we use that domain. If we match the user in
247  * more than one database, we must abort.
248  */
249 static char *
250 find_domain(struct x_passwd *pw)
251 {
252         struct stat statbuf;
253         struct dirent *dirp;
254         DIR *dird;
255         char yp_mapdir[MAXPATHLEN + 2];
256         static char domain[YPMAXDOMAIN];
257         char *tmp = NULL;
258         DBT key, data;
259         int hit = 0;
260
261         yp_error("performing multidomain lookup");
262
263         if ((dird = opendir(yp_dir)) == NULL) {
264                 yp_error("opendir(%s) failed: %s", yp_dir, strerror(errno));
265                 return(NULL);
266         }
267
268         while ((dirp = readdir(dird)) != NULL) {
269                 snprintf(yp_mapdir, sizeof yp_mapdir, "%s/%s",
270                                                         yp_dir, dirp->d_name);
271                 if (stat(yp_mapdir, &statbuf) < 0) {
272                         yp_error("stat(%s) failed: %s", yp_mapdir,
273                                                         strerror(errno));
274                         closedir(dird);
275                         return(NULL);
276                 }
277                 if (S_ISDIR(statbuf.st_mode)) {
278                         tmp = (char *)dirp->d_name;
279                         key.data = pw->pw_name;
280                         key.size = strlen(pw->pw_name);
281
282                         if (yp_get_record(tmp,"master.passwd.byname",
283                                         &key, &data, 0) != YP_TRUE) {
284                                 continue;
285                         }
286                         *((char *)data.data + data.size) = '\0';
287                         copy_yp_pass(data.data, 1, data.size);
288                         if (yp_password.pw_uid == (uid_t)pw->pw_uid &&
289                             yp_password.pw_gid == (gid_t)pw->pw_gid) {
290                                 hit++;
291                                 snprintf(domain, YPMAXDOMAIN, "%s", tmp);
292                         }
293                 }
294         }
295
296         closedir(dird);
297         if (hit > 1) {
298                 yp_error("found same user in two different domains");
299                 return(NULL);
300         } else
301                 return((char *)&domain);
302 }
303
304 static const char *maps[] = {
305         "master.passwd.byname",
306         "master.passwd.byuid",
307         "passwd.byname",
308         "passwd.byuid"
309 };
310
311 static const char *formats[] = {
312         "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s",
313         "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s",
314         "%s:%s:%d:%d:%s:%s:%s",
315         "%s:%s:%d:%d:%s:%s:%s"
316 };
317
318 static int
319 update_inplace(struct passwd *pw, char *domain)
320 {
321         DB *dbp = NULL;
322         DBT key = { NULL, 0 };
323         DBT data = { NULL, 0 };
324         char pwbuf[YPMAXRECORD];
325         char keybuf[20];
326         int i;
327         char *ptr = NULL;
328         static char yp_last[] = "YP_LAST_MODIFIED";
329         char yplastbuf[YPMAXRECORD];
330
331         snprintf(yplastbuf, sizeof yplastbuf, "%llu",
332             (unsigned long long)time(NULL));
333
334         for (i = 0; i < 4; i++) {
335
336                 if (i % 2) {
337                         snprintf(keybuf, sizeof keybuf,
338                             "%llu", (unsigned long long)pw->pw_uid);
339                         key.data = &keybuf;
340                         key.size = strlen(keybuf);
341                 } else {
342                         key.data = pw->pw_name;
343                         key.size = strlen(pw->pw_name);
344                 }
345
346                 /*
347                  * XXX The passwd.byname and passwd.byuid maps come in
348                  * two flavors: secure and insecure. The secure version
349                  * has a '*' in the password field whereas the insecure one
350                  * has a real crypted password. The maps will be insecure
351                  * if they were built with 'unsecure = TRUE' enabled in
352                  * /var/yp/Makefile, but we'd have no way of knowing if
353                  * this has been done unless we were to try parsing the
354                  * Makefile, which is a disgusting thought. Instead, we
355                  * read the records from the maps, skip to the first ':'
356                  * in them, and then look at the character immediately
357                  * following it. If it's an '*' then the map is 'secure'
358                  * and we must not insert a real password into the pw_passwd
359                  * field. If it's not an '*', then we put the real crypted
360                  * password in.
361                  */
362                 if (yp_get_record(domain,maps[i],&key,&data,1) != YP_TRUE) {
363                         yp_error("couldn't read %s/%s: %s", domain,
364                                                 maps[i], strerror(errno));
365                         return(1);
366                 }
367
368                 if ((ptr = strchr(data.data, ':')) == NULL) {
369                         yp_error("no colon in passwd record?!");
370                         return(1);
371                 }
372
373                 /*
374                  * XXX Supposing we have more than one user with the same
375                  * UID? (Or more than one user with the same name?) We could
376                  * end up modifying the wrong record if were not careful.
377                  */
378                 if (i % 2) {
379                         if (strncmp(data.data, pw->pw_name,
380                                                         strlen(pw->pw_name))) {
381                                 yp_error("warning: found entry for UID %d \
382 in map %s@%s with wrong name (%.*s)", pw->pw_uid, maps[i], domain,
383                                     (int)(ptr - (char *)data.data),
384                                     (char *)data.data);
385                                 yp_error("there may be more than one user \
386 with the same UID - continuing");
387                                 continue;
388                         }
389                 } else {
390                         /*
391                          * We're really being ultra-paranoid here.
392                          * This is generally a 'can't happen' condition.
393                          */
394                         snprintf(pwbuf, sizeof pwbuf, ":%d:%d:", pw->pw_uid,
395                                                                   pw->pw_gid);
396                         if (!strstr(data.data, pwbuf)) {
397                                 yp_error("warning: found entry for user %s \
398 in map %s@%s with wrong UID", pw->pw_name, maps[i], domain);
399                                 yp_error("there may be more than one user \
400 with the same name - continuing");
401                                 continue;
402                         }
403                 }
404
405                 if (i < 2) {
406                         snprintf(pwbuf, sizeof pwbuf, formats[i],
407                            pw->pw_name, pw->pw_passwd, pw->pw_uid,
408                            pw->pw_gid, pw->pw_class, pw->pw_change,
409                            pw->pw_expire, pw->pw_gecos, pw->pw_dir,
410                            pw->pw_shell);
411                 } else {
412                         snprintf(pwbuf, sizeof pwbuf, formats[i],
413                            pw->pw_name, *(ptr+1) == '*' ? "*" : pw->pw_passwd,
414                            pw->pw_uid, pw->pw_gid, pw->pw_gecos, pw->pw_dir,
415                            pw->pw_shell);
416                 }
417
418 #define FLAGS O_RDWR|O_CREAT
419
420                 if ((dbp = yp_open_db_rw(domain, maps[i], FLAGS)) == NULL) {
421                         yp_error("couldn't open %s/%s r/w: %s",domain,
422                                                 maps[i],strerror(errno));
423                         return(1);
424                 }
425
426                 data.data = pwbuf;
427                 data.size = strlen(pwbuf);
428
429                 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) {
430                         yp_error("failed to update record in %s/%s", domain,
431                                                                 maps[i]);
432                         (void)(dbp->close)(dbp);
433                         return(1);
434                 }
435
436                 key.data = yp_last;
437                 key.size = strlen(yp_last);
438                 data.data = (char *)&yplastbuf;
439                 data.size = strlen(yplastbuf);
440
441                 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) {
442                         yp_error("failed to update timestamp in %s/%s", domain,
443                                                                 maps[i]);
444                         (void)(dbp->close)(dbp);
445                         return(1);
446                 }
447
448                 (void)(dbp->close)(dbp);
449         }
450
451         return(0);
452 }
453
454 int *
455 yppasswdproc_update_1_svc(yppasswd *argp, struct svc_req *rqstp)
456 {
457         static int  result;
458         struct sockaddr_in *rqhost;
459         DBT key, data;
460         int rval = 0;
461         int pfd, tfd;
462         int pid;
463         int passwd_changed = 0;
464         int shell_changed = 0;
465         int gecos_changed = 0;
466         char *cryptpw;
467         char *oldshell = NULL;
468         char *oldgecos = NULL;
469         char *passfile_hold;
470         char passfile_buf[MAXPATHLEN + 2];
471         char passfile_hold_buf[MAXPATHLEN + 2];
472         char *domain = yppasswd_domain;
473         static struct sockaddr_in clntaddr;
474         static struct timeval t_saved, t_test;
475
476         /*
477          * Normal user updates always use the 'default' master.passwd file.
478          */
479
480         passfile = passfile_default;
481         result = 1;
482
483         rqhost = svc_getcaller(rqstp->rq_xprt);
484
485         gettimeofday(&t_test, NULL);
486         if (!bcmp(rqhost, &clntaddr, sizeof *rqhost) &&
487                 t_test.tv_sec > t_saved.tv_sec &&
488                 t_test.tv_sec - t_saved.tv_sec < 300) {
489
490                 bzero(&clntaddr, sizeof clntaddr);
491                 bzero(&t_saved, sizeof t_saved);
492                 return(NULL);
493         }
494
495         bcopy(rqhost, &clntaddr, sizeof clntaddr);
496         gettimeofday(&t_saved, NULL);
497
498         if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) {
499                 yp_error("rejected update request from unauthorized host");
500                 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED);
501                 return(&result);
502         }
503
504         /*
505          * Step one: find the user. (It's kinda pointless to
506          * proceed if the user doesn't exist.) We look for the
507          * user in the master.passwd.byname database, _NOT_ by
508          * using getpwent() and friends! We can't use getpwent()
509          * since the NIS master server is not guaranteed to be
510          * configured as an NIS client.
511          */
512
513         if (multidomain) {
514                 if ((domain = find_domain(&argp->newpw)) == NULL) {
515                         yp_error("multidomain lookup failed - aborting update");
516                         return(&result);
517                 } else
518                         yp_error("updating user %s in domain %s",
519                                         argp->newpw.pw_name, domain);
520         }
521
522         key.data = argp->newpw.pw_name;
523         key.size = strlen(argp->newpw.pw_name);
524
525         if ((rval = yp_get_record(domain,"master.passwd.byname",
526                         &key, &data, 0)) != YP_TRUE) {
527                 if (rval == YP_NOKEY) {
528                         yp_error("user %s not found in passwd database",
529                                 argp->newpw.pw_name);
530                 } else {
531                         yp_error("database access error: %s",
532                                 yperr_string(rval));
533                 }
534                 return(&result);
535         }
536
537         /* Nul terminate, please. */
538         *((char *)data.data + data.size) = '\0';
539
540         copy_yp_pass(data.data, 1, data.size);
541
542         /* Step 2: check that the supplied oldpass is valid. */
543
544         cryptpw = crypt(argp->oldpass, yp_password.pw_passwd);
545         if (cryptpw == NULL || strcmp(cryptpw, yp_password.pw_passwd)) {
546                 yp_error("rejected change attempt -- bad password");
547                 yp_error("client address: %s username: %s",
548                           inet_ntoa(rqhost->sin_addr),
549                           argp->newpw.pw_name);
550                 return(&result);
551         }
552
553         /* Step 3: validate the arguments passed to us by the client. */
554
555         if (validate(&yp_password, &argp->newpw)) {
556                 yp_error("rejecting change attempt: bad arguments");
557                 yp_error("client address: %s username: %s",
558                          inet_ntoa(rqhost->sin_addr),
559                          argp->newpw.pw_name);
560                 svcerr_decode(rqstp->rq_xprt);
561                 return(&result);
562         }
563
564         /* Step 4: update the user's passwd structure. */
565
566         if (!no_chsh && strcmp(argp->newpw.pw_shell, yp_password.pw_shell)) {
567                 oldshell = yp_password.pw_shell;
568                 yp_password.pw_shell = argp->newpw.pw_shell;
569                 shell_changed++;
570         }
571
572
573         if (!no_chfn && strcmp(argp->newpw.pw_gecos, yp_password.pw_gecos)) {
574                 oldgecos = yp_password.pw_gecos;
575                 yp_password.pw_gecos = argp->newpw.pw_gecos;
576                 gecos_changed++;
577         }
578
579         if (strcmp(argp->newpw.pw_passwd, yp_password.pw_passwd)) {
580                 yp_password.pw_passwd = argp->newpw.pw_passwd;
581                 yp_password.pw_change = 0;
582                 passwd_changed++;
583         }
584
585         /*
586          * If the caller specified a domain other than our 'default'
587          * domain, change the path to master.passwd accordingly.
588          */
589
590         if (strcmp(domain, yppasswd_domain)) {
591                 snprintf(passfile_buf, sizeof(passfile_buf),
592                         "%s/%s/master.passwd", yp_dir, domain);
593                 passfile = (char *)&passfile_buf;
594         }
595
596         /*
597          * Create a filename to hold the original master.passwd
598          * so if our call to yppwupdate fails we can roll back
599          */
600         snprintf(passfile_hold_buf, sizeof(passfile_hold_buf),
601             "%s.hold", passfile);
602         passfile_hold = (char *)&passfile_hold_buf;
603         
604
605         /* Step 5: make a new password file with the updated info. */
606
607         if (pw_init(dirname(passfile), passfile)) {
608                 yp_error("pw_init() failed");
609                 return &result;
610         }
611         if ((pfd = pw_lock()) == -1) {
612                 pw_fini();
613                 yp_error("pw_lock() failed");
614                 return &result;
615         }
616         if ((tfd = pw_tmp(-1)) == -1) {
617                 pw_fini();
618                 yp_error("pw_tmp() failed");
619                 return &result;
620         }
621         if (pw_copy(pfd, tfd, &yp_password, NULL) == -1) {
622                 pw_fini();
623                 yp_error("pw_copy() failed");
624                 return &result;
625         }
626         if (rename(passfile, passfile_hold) == -1) {
627                 pw_fini();
628                 yp_error("rename of %s to %s failed", passfile,
629                     passfile_hold);
630                 return &result;
631         }
632
633         if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) { 
634                 /*
635                  * NIS server is exporting the system's master.passwd.
636                  * Call pw_mkdb to rebuild passwd and the .db files
637                  */
638                 if (pw_mkdb(yp_password.pw_name) == -1) {
639                         pw_fini();
640                         yp_error("pw_mkdb() failed");
641                         rename(passfile_hold, passfile);
642                         return &result;
643                 }
644         } else {
645                 /*
646                  * NIS server is exporting a private master.passwd.
647                  * Rename tempfile into final location
648                  */
649                 if (rename(pw_tempname(), passfile) == -1) {
650                         pw_fini();
651                         yp_error("rename of %s to %s failed",
652                             pw_tempname(), passfile);
653                         rename(passfile_hold, passfile);
654                         return &result;
655                 }
656         }
657
658         pw_fini();
659
660         if (inplace) {
661                 if ((rval = update_inplace(&yp_password, domain))) {
662                         yp_error("inplace update failed -- rebuilding maps");
663                 }
664         }
665
666         switch ((pid = fork())) {
667         case 0:
668                 if (inplace && !rval) {
669                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
670                                 yppasswd_domain, "pushpw", (char *)NULL);
671                 } else {
672                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
673                                 yppasswd_domain, (char *)NULL);
674                 }
675                 yp_error("couldn't exec map update process: %s",
676                                         strerror(errno));
677                 unlink(passfile);
678                 rename(passfile_hold, passfile);
679                 exit(1);
680                 break;
681         case -1:
682                 yp_error("fork() failed: %s", strerror(errno));
683                 unlink(passfile);
684                 rename(passfile_hold, passfile);
685                 return(&result);
686                 break;
687         default:
688                 unlink(passfile_hold);
689                 break;
690         }
691
692         if (verbose) {
693                 yp_error("update completed for user %s (uid %d) in %s:",
694                     argp->newpw.pw_name, argp->newpw.pw_uid, passfile);
695
696                 if (passwd_changed)
697                         yp_error("password changed");
698
699                 if (gecos_changed)
700                         yp_error("gecos changed ('%s' -> '%s')",
701                                         oldgecos, argp->newpw.pw_gecos);
702
703                 if (shell_changed)
704                         yp_error("shell changed ('%s' -> '%s')",
705                                         oldshell, argp->newpw.pw_shell);
706         }
707
708         result = 0;
709         return (&result);
710 }
711
712 /*
713  * Note that this function performs a little less sanity checking
714  * than the last one. Since only the superuser is allowed to use it,
715  * it is assumed that the caller knows what he's doing.
716  */
717 int *
718 yppasswdproc_update_master_1_svc(master_yppasswd *argp,
719     struct svc_req *rqstp)
720 {
721         static int result;
722         int pfd, tfd;
723         int pid;
724         uid_t uid;
725         int rval = 0;
726         DBT key, data;
727         char *passfile_hold;
728         char passfile_buf[MAXPATHLEN + 2];
729         char passfile_hold_buf[MAXPATHLEN + 2];
730         struct sockaddr_in *rqhost;
731         SVCXPRT *transp;
732         struct passwd newpasswd;
733
734         result = 1;
735         transp = rqstp->rq_xprt;
736
737         /*
738          * NO AF_INET CONNETCIONS ALLOWED!
739          */
740         rqhost = svc_getcaller(transp);
741         if (rqhost->sin_family != AF_UNIX) {
742                 yp_error("Alert! %s/%d attempted to use superuser-only \
743 procedure!\n", inet_ntoa(rqhost->sin_addr), rqhost->sin_port);
744                 svcerr_auth(transp, AUTH_BADCRED);
745                 return(&result);
746         }
747
748         if (rqstp->rq_cred.oa_flavor != AUTH_SYS) {
749                 yp_error("caller didn't send proper credentials");
750                 svcerr_auth(transp, AUTH_BADCRED);
751                 return(&result);
752         }
753
754         if (__rpc_get_local_uid(transp, &uid) < 0) {
755                 yp_error("caller didn't send proper credentials");
756                 svcerr_auth(transp, AUTH_BADCRED);
757                 return(&result);
758         }
759
760         if (uid) {
761                 yp_error("caller euid is %d, expecting 0 -- rejecting request",
762                     uid);
763                 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED);
764                 return(&result);
765         }
766
767         passfile = passfile_default;
768
769         key.data = argp->newpw.pw_name;
770         key.size = strlen(argp->newpw.pw_name);
771
772         /*
773          * The superuser may add entries to the passwd maps if
774          * rpc.yppasswdd is started with the -a flag. Paranoia
775          * prevents me from allowing additions by default.
776          */
777         if ((rval = yp_get_record(argp->domain, "master.passwd.byname",
778                           &key, &data, 0)) != YP_TRUE) {
779                 if (rval == YP_NOKEY) {
780                         yp_error("user %s not found in passwd database",
781                                  argp->newpw.pw_name);
782                         if (allow_additions)
783                                 yp_error("notice: adding user %s to \
784 master.passwd database for domain %s", argp->newpw.pw_name, argp->domain);
785                         else
786                                 yp_error("restart rpc.yppasswdd with the -a flag to \
787 allow additions to be made to the password database");
788                 } else {
789                         yp_error("database access error: %s",
790                                  yperr_string(rval));
791                 }
792                 if (!allow_additions)
793                         return(&result);
794         } else {
795
796                 /* Nul terminate, please. */
797                 *((char *)data.data + data.size) = '\0';
798
799                 copy_yp_pass(data.data, 1, data.size);
800         }
801
802         /*
803          * Perform a small bit of sanity checking.
804          */
805         if (validate_master(rval == YP_TRUE ? &yp_password:NULL,&argp->newpw)){
806                 yp_error("rejecting update attempt for %s: bad arguments",
807                          argp->newpw.pw_name);
808                 return(&result);
809         }
810
811         /*
812          * If the caller specified a domain other than our 'default'
813          * domain, change the path to master.passwd accordingly.
814          */
815
816         if (strcmp(argp->domain, yppasswd_domain)) {
817                 snprintf(passfile_buf, sizeof(passfile_buf),
818                         "%s/%s/master.passwd", yp_dir, argp->domain);
819                 passfile = (char *)&passfile_buf;
820         }
821
822         /*
823          * Create a filename to hold the original master.passwd
824          * so if our call to yppwupdate fails we can roll back
825          */
826         snprintf(passfile_hold_buf, sizeof(passfile_hold_buf),
827             "%s.hold", passfile);
828         passfile_hold = (char *)&passfile_hold_buf;
829
830         if (pw_init(dirname(passfile), passfile)) {
831                 yp_error("pw_init() failed");
832                 return &result;
833         }
834         if ((pfd = pw_lock()) == -1) {
835                 pw_fini();
836                 yp_error("pw_lock() failed");
837                 return &result;
838         }
839         if ((tfd = pw_tmp(-1)) == -1) {
840                 pw_fini();
841                 yp_error("pw_tmp() failed");
842                 return &result;
843         }
844         xlate_passwd(&argp->newpw, &newpasswd);
845         if (pw_copy(pfd, tfd, &newpasswd, NULL) == -1) {
846                 pw_fini();
847                 yp_error("pw_copy() failed");
848                 return &result;
849         }
850         if (rename(passfile, passfile_hold) == -1) {
851                 pw_fini();
852                 yp_error("rename of %s to %s failed", passfile,
853                     passfile_hold);
854                 return &result;
855         }
856         if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) {
857                 /*
858                  * NIS server is exporting the system's master.passwd.
859                  * Call pw_mkdb to rebuild passwd and the .db files
860                  */
861                 if (pw_mkdb(argp->newpw.pw_name) == -1) {
862                         pw_fini();
863                         yp_error("pw_mkdb() failed");
864                         rename(passfile_hold, passfile);
865                         return &result;
866                 }
867         } else {
868                 /*
869                  * NIS server is exporting a private master.passwd.
870                  * Rename tempfile into final location
871                  */
872                 if (rename(pw_tempname(), passfile) == -1) {
873                         pw_fini();
874                         yp_error("rename of %s to %s failed",
875                             pw_tempname(), passfile);
876                         rename(passfile_hold, passfile);
877                         return &result;
878                 }
879         }
880         pw_fini();
881
882         if (inplace) {
883                 xlate_passwd(&argp->newpw, &newpasswd);
884                 if ((rval = update_inplace(&newpasswd, argp->domain))) {
885                         yp_error("inplace update failed -- rebuilding maps");
886                 }
887         }
888
889         switch ((pid = fork())) {
890         case 0:
891                 if (inplace && !rval) {
892                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
893                                 argp->domain, "pushpw", (char *)NULL);
894                 } else {
895                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
896                                 argp->domain, (char *)NULL);
897                 }
898                 yp_error("couldn't exec map update process: %s",
899                                         strerror(errno));
900                 unlink(passfile);
901                 rename(passfile_hold, passfile);
902                 exit(1);
903                 break;
904         case -1:
905                 yp_error("fork() failed: %s", strerror(errno));
906                 unlink(passfile);
907                 rename(passfile_hold, passfile);
908                 return(&result);
909                 break;
910         default:
911                 unlink(passfile_hold);
912                 break;
913         }
914
915         yp_error("performed update of user %s (uid %d) domain %s",
916                                                 argp->newpw.pw_name,
917                                                 argp->newpw.pw_uid,
918                                                 argp->domain);
919
920         result = 0;
921         return(&result);
922 }