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)       e = t; while ((*t++ = *p++));
 107         EXPAND(yp_password.pw_name);
 108         yp_password.pw_fields |= _PWF_NAME;
 109         EXPAND(yp_password.pw_passwd);
 110         yp_password.pw_fields |= _PWF_PASSWD;
 111         yp_password.pw_uid = atoi(p);
 112         p += (strlen(p) + 1);
 113         yp_password.pw_fields |= _PWF_UID;
 114         yp_password.pw_gid = atoi(p);
 115         p += (strlen(p) + 1);
 116         yp_password.pw_fields |= _PWF_GID;
 117         if (x) {
 118                 EXPAND(yp_password.pw_class);
 119                 yp_password.pw_fields |= _PWF_CLASS;
 120                 yp_password.pw_change = atol(p);
 121                 p += (strlen(p) + 1);
 122                 yp_password.pw_fields |= _PWF_CHANGE;
 123                 yp_password.pw_expire = atol(p);
 124                 p += (strlen(p) + 1);
 125                 yp_password.pw_fields |= _PWF_EXPIRE;
 126         }
 127         EXPAND(yp_password.pw_gecos);
 128         yp_password.pw_fields |= _PWF_GECOS;
 129         EXPAND(yp_password.pw_dir);
 130         yp_password.pw_fields |= _PWF_DIR;
 131         EXPAND(yp_password.pw_shell);
 132         yp_password.pw_fields |= _PWF_SHELL;
 133
 134         return;
 135 }
 136
 137 static int
 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
 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
 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 (!ok_shell(npw->pw_shell)) {
 216                 yp_error("%s is not a valid shell", npw->pw_shell);
 217                 return(1);
 218         }
 219
 220         if (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 *
 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
 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[YPMAXRECORD];
 322         char keybuf[20];
 323         int i;
 324         char *ptr = NULL;
 325         static char yp_last[] = "YP_LAST_MODIFIED";
 326         char yplastbuf[YPMAXRECORD];
 327
 328         snprintf(yplastbuf, sizeof yplastbuf, "%llu",
 329             (unsigned long long)time(NULL));
 330
 331         for (i = 0; i < 4; i++) {
 332
 333                 if (i % 2) {
 334                         snprintf(keybuf, sizeof keybuf,
 335                             "%llu", (unsigned long long)pw->pw_uid);
 336                         key.data = &keybuf;
 337                         key.size = strlen(keybuf);
 338                 } else {
 339                         key.data = pw->pw_name;
 340                         key.size = strlen(pw->pw_name);
 341                 }
 342
 343                 /*
 344                  * XXX The passwd.byname and passwd.byuid maps come in
 345                  * two flavors: secure and insecure. The secure version
 346                  * has a '*' in the password field whereas the insecure one
 347                  * has a real crypted password. The maps will be insecure
 348                  * if they were built with 'unsecure = TRUE' enabled in
 349                  * /var/yp/Makefile, but we'd have no way of knowing if
 350                  * this has been done unless we were to try parsing the
 351                  * Makefile, which is a disgusting thought. Instead, we
 352                  * read the records from the maps, skip to the first ':'
 353                  * in them, and then look at the character immediately
 354                  * following it. If it's an '*' then the map is 'secure'
 355                  * and we must not insert a real password into the pw_passwd
 356                  * field. If it's not an '*', then we put the real crypted
 357                  * password in.
 358                  */
 359                 if (yp_get_record(domain,maps[i],&key,&data,1) != YP_TRUE) {
 360                         yp_error("couldn't read %s/%s: %s", domain,
 361                                                 maps[i], strerror(errno));
 362                         return(1);
 363                 }
 364
 365                 if ((ptr = strchr(data.data, ':')) == NULL) {
 366                         yp_error("no colon in passwd record?!");
 367                         return(1);
 368                 }
 369
 370                 /*
 371                  * XXX Supposing we have more than one user with the same
 372                  * UID? (Or more than one user with the same name?) We could
 373                  * end up modifying the wrong record if were not careful.
 374                  */
 375                 if (i % 2) {
 376                         if (strncmp(data.data, pw->pw_name,
 377                                                         strlen(pw->pw_name))) {
 378                                 yp_error("warning: found entry for UID %d \
 379 in map %s@%s with wrong name (%.*s)", pw->pw_uid, maps[i], domain,
 380                                     (int)(ptr - (char *)data.data),
 381                                     (char *)data.data);
 382                                 yp_error("there may be more than one user \
 383 with the same UID - continuing");
 384                                 continue;
 385                         }
 386                 } else {
 387                         /*
 388                          * We're really being ultra-paranoid here.
 389                          * This is generally a 'can't happen' condition.
 390                          */
 391                         snprintf(pwbuf, sizeof pwbuf, ":%d:%d:", pw->pw_uid,
 392                                                                   pw->pw_gid);
 393                         if (!strstr(data.data, pwbuf)) {
 394                                 yp_error("warning: found entry for user %s \
 395 in map %s@%s with wrong UID", pw->pw_name, maps[i], domain);
 396                                 yp_error("there may be more than one user \
 397 with the same name - continuing");
 398                                 continue;
 399                         }
 400                 }
 401
 402                 if (i < 2) {
 403                         snprintf(pwbuf, sizeof pwbuf, formats[i],
 404                            pw->pw_name, pw->pw_passwd, pw->pw_uid,
 405                            pw->pw_gid, pw->pw_class, pw->pw_change,
 406                            pw->pw_expire, pw->pw_gecos, pw->pw_dir,
 407                            pw->pw_shell);
 408                 } else {
 409                         snprintf(pwbuf, sizeof pwbuf, formats[i],
 410                            pw->pw_name, *(ptr+1) == '*' ? "*" : pw->pw_passwd,
 411                            pw->pw_uid, pw->pw_gid, pw->pw_gecos, pw->pw_dir,
 412                            pw->pw_shell);
 413                 }
 414
 415 #define FLAGS O_RDWR|O_CREAT
 416
 417                 if ((dbp = yp_open_db_rw(domain, maps[i], FLAGS)) == NULL) {
 418                         yp_error("couldn't open %s/%s r/w: %s",domain,
 419                                                 maps[i],strerror(errno));
 420                         return(1);
 421                 }
 422
 423                 data.data = pwbuf;
 424                 data.size = strlen(pwbuf);
 425
 426                 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) {
 427                         yp_error("failed to update record in %s/%s", domain,
 428                                                                 maps[i]);
 429                         (void)(dbp->close)(dbp);
 430                         return(1);
 431                 }
 432
 433                 key.data = yp_last;
 434                 key.size = strlen(yp_last);
 435                 data.data = (char *)&yplastbuf;
 436                 data.size = strlen(yplastbuf);
 437
 438                 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) {
 439                         yp_error("failed to update timestamp in %s/%s", domain,
 440                                                                 maps[i]);
 441                         (void)(dbp->close)(dbp);
 442                         return(1);
 443                 }
 444
 445                 (void)(dbp->close)(dbp);
 446         }
 447
 448         return(0);
 449 }
 450
 451 int *
 452 yppasswdproc_update_1_svc(yppasswd *argp, struct svc_req *rqstp)
 453 {
 454         static int  result;
 455         struct sockaddr_in *rqhost;
 456         DBT key, data;
 457         int rval = 0;
 458         int pfd, tfd;
 459         int pid;
 460         int passwd_changed = 0;
 461         int shell_changed = 0;
 462         int gecos_changed = 0;
 463         char *oldshell = NULL;
 464         char *oldgecos = NULL;
 465         char *passfile_hold;
 466         char passfile_buf[MAXPATHLEN + 2];
 467         char passfile_hold_buf[MAXPATHLEN + 2];
 468         char *domain = yppasswd_domain;
 469         static struct sockaddr_in clntaddr;
 470         static struct timeval t_saved, t_test;
 471
 472         /*
 473          * Normal user updates always use the 'default' master.passwd file.
 474          */
 475
 476         passfile = passfile_default;
 477         result = 1;
 478
 479         rqhost = svc_getcaller(rqstp->rq_xprt);
 480
 481         gettimeofday(&t_test, NULL);
 482         if (!bcmp(rqhost, &clntaddr, sizeof *rqhost) &&
 483                 t_test.tv_sec > t_saved.tv_sec &&
 484                 t_test.tv_sec - t_saved.tv_sec < 300) {
 485
 486                 bzero(&clntaddr, sizeof clntaddr);
 487                 bzero(&t_saved, sizeof t_saved);
 488                 return(NULL);
 489         }
 490
 491         bcopy(rqhost, &clntaddr, sizeof clntaddr);
 492         gettimeofday(&t_saved, NULL);
 493
 494         if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) {
 495                 yp_error("rejected update request from unauthorized host");
 496                 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED);
 497                 return(&result);
 498         }
 499
 500         /*
 501          * Step one: find the user. (It's kinda pointless to
 502          * proceed if the user doesn't exist.) We look for the
 503          * user in the master.passwd.byname database, _NOT_ by
 504          * using getpwent() and friends! We can't use getpwent()
 505          * since the NIS master server is not guaranteed to be
 506          * configured as an NIS client.
 507          */
 508
 509         if (multidomain) {
 510                 if ((domain = find_domain(&argp->newpw)) == NULL) {
 511                         yp_error("multidomain lookup failed - aborting update");
 512                         return(&result);
 513                 } else
 514                         yp_error("updating user %s in domain %s",
 515                                         argp->newpw.pw_name, domain);
 516         }
 517
 518         key.data = argp->newpw.pw_name;
 519         key.size = strlen(argp->newpw.pw_name);
 520
 521         if ((rval = yp_get_record(domain,"master.passwd.byname",
 522                         &key, &data, 0)) != YP_TRUE) {
 523                 if (rval == YP_NOKEY) {
 524                         yp_error("user %s not found in passwd database",
 525                                 argp->newpw.pw_name);
 526                 } else {
 527                         yp_error("database access error: %s",
 528                                 yperr_string(rval));
 529                 }
 530                 return(&result);
 531         }
 532
 533         /* Nul terminate, please. */
 534         *((char *)data.data + data.size) = '\0';
 535
 536         copy_yp_pass(data.data, 1, data.size);
 537
 538         /* Step 2: check that the supplied oldpass is valid. */
 539
 540         if (strcmp(crypt(argp->oldpass, yp_password.pw_passwd),
 541                                         yp_password.pw_passwd)) {
 542                 yp_error("rejected change attempt -- bad password");
 543                 yp_error("client address: %s username: %s",
 544                           inet_ntoa(rqhost->sin_addr),
 545                           argp->newpw.pw_name);
 546                 return(&result);
 547         }
 548
 549         /* Step 3: validate the arguments passed to us by the client. */
 550
 551         if (validate(&yp_password, &argp->newpw)) {
 552                 yp_error("rejecting change attempt: bad arguments");
 553                 yp_error("client address: %s username: %s",
 554                          inet_ntoa(rqhost->sin_addr),
 555                          argp->newpw.pw_name);
 556                 svcerr_decode(rqstp->rq_xprt);
 557                 return(&result);
 558         }
 559
 560         /* Step 4: update the user's passwd structure. */
 561
 562         if (!no_chsh && strcmp(argp->newpw.pw_shell, yp_password.pw_shell)) {
 563                 oldshell = yp_password.pw_shell;
 564                 yp_password.pw_shell = argp->newpw.pw_shell;
 565                 shell_changed++;
 566         }
 567
 568
 569         if (!no_chfn && strcmp(argp->newpw.pw_gecos, yp_password.pw_gecos)) {
 570                 oldgecos = yp_password.pw_gecos;
 571                 yp_password.pw_gecos = argp->newpw.pw_gecos;
 572                 gecos_changed++;
 573         }
 574
 575         if (strcmp(argp->newpw.pw_passwd, yp_password.pw_passwd)) {
 576                 yp_password.pw_passwd = argp->newpw.pw_passwd;
 577                 yp_password.pw_change = 0;
 578                 passwd_changed++;
 579         }
 580
 581         /*
 582          * If the caller specified a domain other than our 'default'
 583          * domain, change the path to master.passwd accordingly.
 584          */
 585
 586         if (strcmp(domain, yppasswd_domain)) {
 587                 snprintf(passfile_buf, sizeof(passfile_buf),
 588                         "%s/%s/master.passwd", yp_dir, domain);
 589                 passfile = (char *)&passfile_buf;
 590         }
 591
 592         /*
 593          * Create a filename to hold the original master.passwd
 594          * so if our call to yppwupdate fails we can roll back
 595          */
 596         snprintf(passfile_hold_buf, sizeof(passfile_hold_buf),
 597             "%s.hold", passfile);
 598         passfile_hold = (char *)&passfile_hold_buf;
 599
 600
 601         /* Step 5: make a new password file with the updated info. */
 602
 603         if (pw_init(dirname(passfile), passfile)) {
 604                 yp_error("pw_init() failed");
 605                 return &result;
 606         }
 607         if ((pfd = pw_lock()) == -1) {
 608                 pw_fini();
 609                 yp_error("pw_lock() failed");
 610                 return &result;
 611         }
 612         if ((tfd = pw_tmp(-1)) == -1) {
 613                 pw_fini();
 614                 yp_error("pw_tmp() failed");
 615                 return &result;
 616         }
 617         if (pw_copy(pfd, tfd, &yp_password, NULL) == -1) {
 618                 pw_fini();
 619                 yp_error("pw_copy() failed");
 620                 return &result;
 621         }
 622         if (rename(passfile, passfile_hold) == -1) {
 623                 pw_fini();
 624                 yp_error("rename of %s to %s failed", passfile,
 625                     passfile_hold);
 626                 return &result;
 627         }
 628
 629         if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) {
 630                 /*
 631                  * NIS server is exporting the system's master.passwd.
 632                  * Call pw_mkdb to rebuild passwd and the .db files
 633                  */
 634                 if (pw_mkdb(yp_password.pw_name) == -1) {
 635                         pw_fini();
 636                         yp_error("pw_mkdb() failed");
 637                         rename(passfile_hold, passfile);
 638                         return &result;
 639                 }
 640         } else {
 641                 /*
 642                  * NIS server is exporting a private master.passwd.
 643                  * Rename tempfile into final location
 644                  */
 645                 if (rename(pw_tempname(), passfile) == -1) {
 646                         pw_fini();
 647                         yp_error("rename of %s to %s failed",
 648                             pw_tempname(), passfile);
 649                         rename(passfile_hold, passfile);
 650                         return &result;
 651                 }
 652         }
 653
 654         pw_fini();
 655
 656         if (inplace) {
 657                 if ((rval = update_inplace(&yp_password, domain))) {
 658                         yp_error("inplace update failed -- rebuilding maps");
 659                 }
 660         }
 661
 662         switch ((pid = fork())) {
 663         case 0:
 664                 if (inplace && !rval) {
 665                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
 666                                 yppasswd_domain, "pushpw", (char *)NULL);
 667                 } else {
 668                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
 669                                 yppasswd_domain, (char *)NULL);
 670                 }
 671                 yp_error("couldn't exec map update process: %s",
 672                                         strerror(errno));
 673                 unlink(passfile);
 674                 rename(passfile_hold, passfile);
 675                 exit(1);
 676                 break;
 677         case -1:
 678                 yp_error("fork() failed: %s", strerror(errno));
 679                 unlink(passfile);
 680                 rename(passfile_hold, passfile);
 681                 return(&result);
 682                 break;
 683         default:
 684                 unlink(passfile_hold);
 685                 break;
 686         }
 687
 688         if (verbose) {
 689                 yp_error("update completed for user %s (uid %d) in %s:",
 690                     argp->newpw.pw_name, argp->newpw.pw_uid, passfile);
 691
 692                 if (passwd_changed)
 693                         yp_error("password changed");
 694
 695                 if (gecos_changed)
 696                         yp_error("gecos changed ('%s' -> '%s')",
 697                                         oldgecos, argp->newpw.pw_gecos);
 698
 699                 if (shell_changed)
 700                         yp_error("shell changed ('%s' -> '%s')",
 701                                         oldshell, argp->newpw.pw_shell);
 702         }
 703
 704         result = 0;
 705         return (&result);
 706 }
 707
 708 /*
 709  * Note that this function performs a little less sanity checking
 710  * than the last one. Since only the superuser is allowed to use it,
 711  * it is assumed that the caller knows what he's doing.
 712  */
 713 int *
 714 yppasswdproc_update_master_1_svc(master_yppasswd *argp,
 715     struct svc_req *rqstp)
 716 {
 717         static int result;
 718         int pfd, tfd;
 719         int pid;
 720         uid_t uid;
 721         int rval = 0;
 722         DBT key, data;
 723         char *passfile_hold;
 724         char passfile_buf[MAXPATHLEN + 2];
 725         char passfile_hold_buf[MAXPATHLEN + 2];
 726         struct sockaddr_in *rqhost;
 727         SVCXPRT *transp;
 728         struct passwd newpasswd;
 729
 730         result = 1;
 731         transp = rqstp->rq_xprt;
 732
 733         /*
 734          * NO AF_INET CONNETCIONS ALLOWED!
 735          */
 736         rqhost = svc_getcaller(transp);
 737         if (rqhost->sin_family != AF_UNIX) {
 738                 yp_error("Alert! %s/%d attempted to use superuser-only \
 739 procedure!\n", inet_ntoa(rqhost->sin_addr), rqhost->sin_port);
 740                 svcerr_auth(transp, AUTH_BADCRED);
 741                 return(&result);
 742         }
 743
 744         if (rqstp->rq_cred.oa_flavor != AUTH_SYS) {
 745                 yp_error("caller didn't send proper credentials");
 746                 svcerr_auth(transp, AUTH_BADCRED);
 747                 return(&result);
 748         }
 749
 750         if (__rpc_get_local_uid(transp, &uid) < 0) {
 751                 yp_error("caller didn't send proper credentials");
 752                 svcerr_auth(transp, AUTH_BADCRED);
 753                 return(&result);
 754         }
 755
 756         if (uid) {
 757                 yp_error("caller euid is %d, expecting 0 -- rejecting request",
 758                     uid);
 759                 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED);
 760                 return(&result);
 761         }
 762
 763         passfile = passfile_default;
 764
 765         key.data = argp->newpw.pw_name;
 766         key.size = strlen(argp->newpw.pw_name);
 767
 768         /*
 769          * The superuser may add entries to the passwd maps if
 770          * rpc.yppasswdd is started with the -a flag. Paranoia
 771          * prevents me from allowing additions by default.
 772          */
 773         if ((rval = yp_get_record(argp->domain, "master.passwd.byname",
 774                           &key, &data, 0)) != YP_TRUE) {
 775                 if (rval == YP_NOKEY) {
 776                         yp_error("user %s not found in passwd database",
 777                                  argp->newpw.pw_name);
 778                         if (allow_additions)
 779                                 yp_error("notice: adding user %s to \
 780 master.passwd database for domain %s", argp->newpw.pw_name, argp->domain);
 781                         else
 782                                 yp_error("restart rpc.yppasswdd with the -a flag to \
 783 allow additions to be made to the password database");
 784                 } else {
 785                         yp_error("database access error: %s",
 786                                  yperr_string(rval));
 787                 }
 788                 if (!allow_additions)
 789                         return(&result);
 790         } else {
 791
 792                 /* Nul terminate, please. */
 793                 *((char *)data.data + data.size) = '\0';
 794
 795                 copy_yp_pass(data.data, 1, data.size);
 796         }
 797
 798         /*
 799          * Perform a small bit of sanity checking.
 800          */
 801         if (validate_master(rval == YP_TRUE ? &yp_password:NULL,&argp->newpw)){
 802                 yp_error("rejecting update attempt for %s: bad arguments",
 803                          argp->newpw.pw_name);
 804                 return(&result);
 805         }
 806
 807         /*
 808          * If the caller specified a domain other than our 'default'
 809          * domain, change the path to master.passwd accordingly.
 810          */
 811
 812         if (strcmp(argp->domain, yppasswd_domain)) {
 813                 snprintf(passfile_buf, sizeof(passfile_buf),
 814                         "%s/%s/master.passwd", yp_dir, argp->domain);
 815                 passfile = (char *)&passfile_buf;
 816         }
 817
 818         /*
 819          * Create a filename to hold the original master.passwd
 820          * so if our call to yppwupdate fails we can roll back
 821          */
 822         snprintf(passfile_hold_buf, sizeof(passfile_hold_buf),
 823             "%s.hold", passfile);
 824         passfile_hold = (char *)&passfile_hold_buf;
 825
 826         if (pw_init(dirname(passfile), passfile)) {
 827                 yp_error("pw_init() failed");
 828                 return &result;
 829         }
 830         if ((pfd = pw_lock()) == -1) {
 831                 pw_fini();
 832                 yp_error("pw_lock() failed");
 833                 return &result;
 834         }
 835         if ((tfd = pw_tmp(-1)) == -1) {
 836                 pw_fini();
 837                 yp_error("pw_tmp() failed");
 838                 return &result;
 839         }
 840         xlate_passwd(&argp->newpw, &newpasswd);
 841         if (pw_copy(pfd, tfd, &newpasswd, NULL) == -1) {
 842                 pw_fini();
 843                 yp_error("pw_copy() failed");
 844                 return &result;
 845         }
 846         if (rename(passfile, passfile_hold) == -1) {
 847                 pw_fini();
 848                 yp_error("rename of %s to %s failed", passfile,
 849                     passfile_hold);
 850                 return &result;
 851         }
 852         if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) {
 853                 /*
 854                  * NIS server is exporting the system's master.passwd.
 855                  * Call pw_mkdb to rebuild passwd and the .db files
 856                  */
 857                 if (pw_mkdb(argp->newpw.pw_name) == -1) {
 858                         pw_fini();
 859                         yp_error("pw_mkdb() failed");
 860                         rename(passfile_hold, passfile);
 861                         return &result;
 862                 }
 863         } else {
 864                 /*
 865                  * NIS server is exporting a private master.passwd.
 866                  * Rename tempfile into final location
 867                  */
 868                 if (rename(pw_tempname(), passfile) == -1) {
 869                         pw_fini();
 870                         yp_error("rename of %s to %s failed",
 871                             pw_tempname(), passfile);
 872                         rename(passfile_hold, passfile);
 873                         return &result;
 874                 }
 875         }
 876         pw_fini();
 877
 878         if (inplace) {
 879                 xlate_passwd(&argp->newpw, &newpasswd);
 880                 if ((rval = update_inplace(&newpasswd, argp->domain))) {
 881                         yp_error("inplace update failed -- rebuilding maps");
 882                 }
 883         }
 884
 885         switch ((pid = fork())) {
 886         case 0:
 887                 if (inplace && !rval) {
 888                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
 889                                 argp->domain, "pushpw", (char *)NULL);
 890                 } else {
 891                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
 892                                 argp->domain, (char *)NULL);
 893                 }
 894                 yp_error("couldn't exec map update process: %s",
 895                                         strerror(errno));
 896                 unlink(passfile);
 897                 rename(passfile_hold, passfile);
 898                 exit(1);
 899                 break;
 900         case -1:
 901                 yp_error("fork() failed: %s", strerror(errno));
 902                 unlink(passfile);
 903                 rename(passfile_hold, passfile);
 904                 return(&result);
 905                 break;
 906         default:
 907                 unlink(passfile_hold);
 908                 break;
 909         }
 910
 911         yp_error("performed update of user %s (uid %d) domain %s",
 912                                                 argp->newpw.pw_name,
 913                                                 argp->newpw.pw_uid,
 914                                                 argp->domain);
 915
 916         result = 0;
 917         return(&result);
 918 }