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 *oldshell = NULL;
 467         char *oldgecos = NULL;
 468         char *passfile_hold;
 469         char passfile_buf[MAXPATHLEN + 2];
 470         char passfile_hold_buf[MAXPATHLEN + 2];
 471         char *domain = yppasswd_domain;
 472         static struct sockaddr_in clntaddr;
 473         static struct timeval t_saved, t_test;
 474
 475         /*
 476          * Normal user updates always use the 'default' master.passwd file.
 477          */
 478
 479         passfile = passfile_default;
 480         result = 1;
 481
 482         rqhost = svc_getcaller(rqstp->rq_xprt);
 483
 484         gettimeofday(&t_test, NULL);
 485         if (!bcmp(rqhost, &clntaddr, sizeof *rqhost) &&
 486                 t_test.tv_sec > t_saved.tv_sec &&
 487                 t_test.tv_sec - t_saved.tv_sec < 300) {
 488
 489                 bzero(&clntaddr, sizeof clntaddr);
 490                 bzero(&t_saved, sizeof t_saved);
 491                 return(NULL);
 492         }
 493
 494         bcopy(rqhost, &clntaddr, sizeof clntaddr);
 495         gettimeofday(&t_saved, NULL);
 496
 497         if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) {
 498                 yp_error("rejected update request from unauthorized host");
 499                 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED);
 500                 return(&result);
 501         }
 502
 503         /*
 504          * Step one: find the user. (It's kinda pointless to
 505          * proceed if the user doesn't exist.) We look for the
 506          * user in the master.passwd.byname database, _NOT_ by
 507          * using getpwent() and friends! We can't use getpwent()
 508          * since the NIS master server is not guaranteed to be
 509          * configured as an NIS client.
 510          */
 511
 512         if (multidomain) {
 513                 if ((domain = find_domain(&argp->newpw)) == NULL) {
 514                         yp_error("multidomain lookup failed - aborting update");
 515                         return(&result);
 516                 } else
 517                         yp_error("updating user %s in domain %s",
 518                                         argp->newpw.pw_name, domain);
 519         }
 520
 521         key.data = argp->newpw.pw_name;
 522         key.size = strlen(argp->newpw.pw_name);
 523
 524         if ((rval = yp_get_record(domain,"master.passwd.byname",
 525                         &key, &data, 0)) != YP_TRUE) {
 526                 if (rval == YP_NOKEY) {
 527                         yp_error("user %s not found in passwd database",
 528                                 argp->newpw.pw_name);
 529                 } else {
 530                         yp_error("database access error: %s",
 531                                 yperr_string(rval));
 532                 }
 533                 return(&result);
 534         }
 535
 536         /* Nul terminate, please. */
 537         *((char *)data.data + data.size) = '\0';
 538
 539         copy_yp_pass(data.data, 1, data.size);
 540
 541         /* Step 2: check that the supplied oldpass is valid. */
 542
 543         if (strcmp(crypt(argp->oldpass, yp_password.pw_passwd),
 544                                         yp_password.pw_passwd)) {
 545                 yp_error("rejected change attempt -- bad password");
 546                 yp_error("client address: %s username: %s",
 547                           inet_ntoa(rqhost->sin_addr),
 548                           argp->newpw.pw_name);
 549                 return(&result);
 550         }
 551
 552         /* Step 3: validate the arguments passed to us by the client. */
 553
 554         if (validate(&yp_password, &argp->newpw)) {
 555                 yp_error("rejecting change attempt: bad arguments");
 556                 yp_error("client address: %s username: %s",
 557                          inet_ntoa(rqhost->sin_addr),
 558                          argp->newpw.pw_name);
 559                 svcerr_decode(rqstp->rq_xprt);
 560                 return(&result);
 561         }
 562
 563         /* Step 4: update the user's passwd structure. */
 564
 565         if (!no_chsh && strcmp(argp->newpw.pw_shell, yp_password.pw_shell)) {
 566                 oldshell = yp_password.pw_shell;
 567                 yp_password.pw_shell = argp->newpw.pw_shell;
 568                 shell_changed++;
 569         }
 570
 571
 572         if (!no_chfn && strcmp(argp->newpw.pw_gecos, yp_password.pw_gecos)) {
 573                 oldgecos = yp_password.pw_gecos;
 574                 yp_password.pw_gecos = argp->newpw.pw_gecos;
 575                 gecos_changed++;
 576         }
 577
 578         if (strcmp(argp->newpw.pw_passwd, yp_password.pw_passwd)) {
 579                 yp_password.pw_passwd = argp->newpw.pw_passwd;
 580                 yp_password.pw_change = 0;
 581                 passwd_changed++;
 582         }
 583
 584         /*
 585          * If the caller specified a domain other than our 'default'
 586          * domain, change the path to master.passwd accordingly.
 587          */
 588
 589         if (strcmp(domain, yppasswd_domain)) {
 590                 snprintf(passfile_buf, sizeof(passfile_buf),
 591                         "%s/%s/master.passwd", yp_dir, domain);
 592                 passfile = (char *)&passfile_buf;
 593         }
 594
 595         /*
 596          * Create a filename to hold the original master.passwd
 597          * so if our call to yppwupdate fails we can roll back
 598          */
 599         snprintf(passfile_hold_buf, sizeof(passfile_hold_buf),
 600             "%s.hold", passfile);
 601         passfile_hold = (char *)&passfile_hold_buf;
 602
 603
 604         /* Step 5: make a new password file with the updated info. */
 605
 606         if (pw_init(dirname(passfile), passfile)) {
 607                 yp_error("pw_init() failed");
 608                 return &result;
 609         }
 610         if ((pfd = pw_lock()) == -1) {
 611                 pw_fini();
 612                 yp_error("pw_lock() failed");
 613                 return &result;
 614         }
 615         if ((tfd = pw_tmp(-1)) == -1) {
 616                 pw_fini();
 617                 yp_error("pw_tmp() failed");
 618                 return &result;
 619         }
 620         if (pw_copy(pfd, tfd, &yp_password, NULL) == -1) {
 621                 pw_fini();
 622                 yp_error("pw_copy() failed");
 623                 return &result;
 624         }
 625         if (rename(passfile, passfile_hold) == -1) {
 626                 pw_fini();
 627                 yp_error("rename of %s to %s failed", passfile,
 628                     passfile_hold);
 629                 return &result;
 630         }
 631
 632         if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) {
 633                 /*
 634                  * NIS server is exporting the system's master.passwd.
 635                  * Call pw_mkdb to rebuild passwd and the .db files
 636                  */
 637                 if (pw_mkdb(yp_password.pw_name) == -1) {
 638                         pw_fini();
 639                         yp_error("pw_mkdb() failed");
 640                         rename(passfile_hold, passfile);
 641                         return &result;
 642                 }
 643         } else {
 644                 /*
 645                  * NIS server is exporting a private master.passwd.
 646                  * Rename tempfile into final location
 647                  */
 648                 if (rename(pw_tempname(), passfile) == -1) {
 649                         pw_fini();
 650                         yp_error("rename of %s to %s failed",
 651                             pw_tempname(), passfile);
 652                         rename(passfile_hold, passfile);
 653                         return &result;
 654                 }
 655         }
 656
 657         pw_fini();
 658
 659         if (inplace) {
 660                 if ((rval = update_inplace(&yp_password, domain))) {
 661                         yp_error("inplace update failed -- rebuilding maps");
 662                 }
 663         }
 664
 665         switch ((pid = fork())) {
 666         case 0:
 667                 if (inplace && !rval) {
 668                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
 669                                 yppasswd_domain, "pushpw", (char *)NULL);
 670                 } else {
 671                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
 672                                 yppasswd_domain, (char *)NULL);
 673                 }
 674                 yp_error("couldn't exec map update process: %s",
 675                                         strerror(errno));
 676                 unlink(passfile);
 677                 rename(passfile_hold, passfile);
 678                 exit(1);
 679                 break;
 680         case -1:
 681                 yp_error("fork() failed: %s", strerror(errno));
 682                 unlink(passfile);
 683                 rename(passfile_hold, passfile);
 684                 return(&result);
 685                 break;
 686         default:
 687                 unlink(passfile_hold);
 688                 break;
 689         }
 690
 691         if (verbose) {
 692                 yp_error("update completed for user %s (uid %d) in %s:",
 693                     argp->newpw.pw_name, argp->newpw.pw_uid, passfile);
 694
 695                 if (passwd_changed)
 696                         yp_error("password changed");
 697
 698                 if (gecos_changed)
 699                         yp_error("gecos changed ('%s' -> '%s')",
 700                                         oldgecos, argp->newpw.pw_gecos);
 701
 702                 if (shell_changed)
 703                         yp_error("shell changed ('%s' -> '%s')",
 704                                         oldshell, argp->newpw.pw_shell);
 705         }
 706
 707         result = 0;
 708         return (&result);
 709 }
 710
 711 /*
 712  * Note that this function performs a little less sanity checking
 713  * than the last one. Since only the superuser is allowed to use it,
 714  * it is assumed that the caller knows what he's doing.
 715  */
 716 int *
 717 yppasswdproc_update_master_1_svc(master_yppasswd *argp,
 718     struct svc_req *rqstp)
 719 {
 720         static int result;
 721         int pfd, tfd;
 722         int pid;
 723         uid_t uid;
 724         int rval = 0;
 725         DBT key, data;
 726         char *passfile_hold;
 727         char passfile_buf[MAXPATHLEN + 2];
 728         char passfile_hold_buf[MAXPATHLEN + 2];
 729         struct sockaddr_in *rqhost;
 730         SVCXPRT *transp;
 731         struct passwd newpasswd;
 732
 733         result = 1;
 734         transp = rqstp->rq_xprt;
 735
 736         /*
 737          * NO AF_INET CONNETCIONS ALLOWED!
 738          */
 739         rqhost = svc_getcaller(transp);
 740         if (rqhost->sin_family != AF_UNIX) {
 741                 yp_error("Alert! %s/%d attempted to use superuser-only \
 742 procedure!\n", inet_ntoa(rqhost->sin_addr), rqhost->sin_port);
 743                 svcerr_auth(transp, AUTH_BADCRED);
 744                 return(&result);
 745         }
 746
 747         if (rqstp->rq_cred.oa_flavor != AUTH_SYS) {
 748                 yp_error("caller didn't send proper credentials");
 749                 svcerr_auth(transp, AUTH_BADCRED);
 750                 return(&result);
 751         }
 752
 753         if (__rpc_get_local_uid(transp, &uid) < 0) {
 754                 yp_error("caller didn't send proper credentials");
 755                 svcerr_auth(transp, AUTH_BADCRED);
 756                 return(&result);
 757         }
 758
 759         if (uid) {
 760                 yp_error("caller euid is %d, expecting 0 -- rejecting request",
 761                     uid);
 762                 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED);
 763                 return(&result);
 764         }
 765
 766         passfile = passfile_default;
 767
 768         key.data = argp->newpw.pw_name;
 769         key.size = strlen(argp->newpw.pw_name);
 770
 771         /*
 772          * The superuser may add entries to the passwd maps if
 773          * rpc.yppasswdd is started with the -a flag. Paranoia
 774          * prevents me from allowing additions by default.
 775          */
 776         if ((rval = yp_get_record(argp->domain, "master.passwd.byname",
 777                           &key, &data, 0)) != YP_TRUE) {
 778                 if (rval == YP_NOKEY) {
 779                         yp_error("user %s not found in passwd database",
 780                                  argp->newpw.pw_name);
 781                         if (allow_additions)
 782                                 yp_error("notice: adding user %s to \
 783 master.passwd database for domain %s", argp->newpw.pw_name, argp->domain);
 784                         else
 785                                 yp_error("restart rpc.yppasswdd with the -a flag to \
 786 allow additions to be made to the password database");
 787                 } else {
 788                         yp_error("database access error: %s",
 789                                  yperr_string(rval));
 790                 }
 791                 if (!allow_additions)
 792                         return(&result);
 793         } else {
 794
 795                 /* Nul terminate, please. */
 796                 *((char *)data.data + data.size) = '\0';
 797
 798                 copy_yp_pass(data.data, 1, data.size);
 799         }
 800
 801         /*
 802          * Perform a small bit of sanity checking.
 803          */
 804         if (validate_master(rval == YP_TRUE ? &yp_password:NULL,&argp->newpw)){
 805                 yp_error("rejecting update attempt for %s: bad arguments",
 806                          argp->newpw.pw_name);
 807                 return(&result);
 808         }
 809
 810         /*
 811          * If the caller specified a domain other than our 'default'
 812          * domain, change the path to master.passwd accordingly.
 813          */
 814
 815         if (strcmp(argp->domain, yppasswd_domain)) {
 816                 snprintf(passfile_buf, sizeof(passfile_buf),
 817                         "%s/%s/master.passwd", yp_dir, argp->domain);
 818                 passfile = (char *)&passfile_buf;
 819         }
 820
 821         /*
 822          * Create a filename to hold the original master.passwd
 823          * so if our call to yppwupdate fails we can roll back
 824          */
 825         snprintf(passfile_hold_buf, sizeof(passfile_hold_buf),
 826             "%s.hold", passfile);
 827         passfile_hold = (char *)&passfile_hold_buf;
 828
 829         if (pw_init(dirname(passfile), passfile)) {
 830                 yp_error("pw_init() failed");
 831                 return &result;
 832         }
 833         if ((pfd = pw_lock()) == -1) {
 834                 pw_fini();
 835                 yp_error("pw_lock() failed");
 836                 return &result;
 837         }
 838         if ((tfd = pw_tmp(-1)) == -1) {
 839                 pw_fini();
 840                 yp_error("pw_tmp() failed");
 841                 return &result;
 842         }
 843         xlate_passwd(&argp->newpw, &newpasswd);
 844         if (pw_copy(pfd, tfd, &newpasswd, NULL) == -1) {
 845                 pw_fini();
 846                 yp_error("pw_copy() failed");
 847                 return &result;
 848         }
 849         if (rename(passfile, passfile_hold) == -1) {
 850                 pw_fini();
 851                 yp_error("rename of %s to %s failed", passfile,
 852                     passfile_hold);
 853                 return &result;
 854         }
 855         if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) {
 856                 /*
 857                  * NIS server is exporting the system's master.passwd.
 858                  * Call pw_mkdb to rebuild passwd and the .db files
 859                  */
 860                 if (pw_mkdb(argp->newpw.pw_name) == -1) {
 861                         pw_fini();
 862                         yp_error("pw_mkdb() failed");
 863                         rename(passfile_hold, passfile);
 864                         return &result;
 865                 }
 866         } else {
 867                 /*
 868                  * NIS server is exporting a private master.passwd.
 869                  * Rename tempfile into final location
 870                  */
 871                 if (rename(pw_tempname(), passfile) == -1) {
 872                         pw_fini();
 873                         yp_error("rename of %s to %s failed",
 874                             pw_tempname(), passfile);
 875                         rename(passfile_hold, passfile);
 876                         return &result;
 877                 }
 878         }
 879         pw_fini();
 880
 881         if (inplace) {
 882                 xlate_passwd(&argp->newpw, &newpasswd);
 883                 if ((rval = update_inplace(&newpasswd, argp->domain))) {
 884                         yp_error("inplace update failed -- rebuilding maps");
 885                 }
 886         }
 887
 888         switch ((pid = fork())) {
 889         case 0:
 890                 if (inplace && !rval) {
 891                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
 892                                 argp->domain, "pushpw", (char *)NULL);
 893                 } else {
 894                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
 895                                 argp->domain, (char *)NULL);
 896                 }
 897                 yp_error("couldn't exec map update process: %s",
 898                                         strerror(errno));
 899                 unlink(passfile);
 900                 rename(passfile_hold, passfile);
 901                 exit(1);
 902                 break;
 903         case -1:
 904                 yp_error("fork() failed: %s", strerror(errno));
 905                 unlink(passfile);
 906                 rename(passfile_hold, passfile);
 907                 return(&result);
 908                 break;
 909         default:
 910                 unlink(passfile_hold);
 911                 break;
 912         }
 913
 914         yp_error("performed update of user %s (uid %d) domain %s",
 915                                                 argp->newpw.pw_name,
 916                                                 argp->newpw.pw_uid,
 917                                                 argp->domain);
 918
 919         result = 0;
 920         return(&result);
 921 }