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  * $FreeBSD: src/usr.sbin/rpc.yppasswdd/yppasswdd_server.c,v 1.29 2003/06/15 21:24:45 mbr Exp $
  33  * $DragonFly: src/usr.sbin/rpc.yppasswdd/yppasswdd_server.c,v 1.7 2005/11/25 00:32:49 swildner Exp $
  34  */
  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 copy_yp_pass(char *p, int x, int m)
  74 {
  75         char *t, *s = p;
  76         static char *buf;
  77
  78         yp_password.pw_fields = 0;
  79
  80         buf = realloc(buf, m + 10);
  81         bzero(buf, m + 10);
  82
  83         /* Turn all colons into NULLs */
  84         while (strchr(s, ':')) {
  85                 s = (strchr(s, ':') + 1);
  86                 *(s - 1)= '\0';
  87         }
  88
  89         t = buf;
  90 #define EXPAND(e)       e = t; while ((*t++ = *p++));
  91         EXPAND(yp_password.pw_name);
  92         yp_password.pw_fields |= _PWF_NAME;
  93         EXPAND(yp_password.pw_passwd);
  94         yp_password.pw_fields |= _PWF_PASSWD;
  95         yp_password.pw_uid = atoi(p);
  96         p += (strlen(p) + 1);
  97         yp_password.pw_fields |= _PWF_UID;
  98         yp_password.pw_gid = atoi(p);
  99         p += (strlen(p) + 1);
 100         yp_password.pw_fields |= _PWF_GID;
 101         if (x) {
 102                 EXPAND(yp_password.pw_class);
 103                 yp_password.pw_fields |= _PWF_CLASS;
 104                 yp_password.pw_change = atol(p);
 105                 p += (strlen(p) + 1);
 106                 yp_password.pw_fields |= _PWF_CHANGE;
 107                 yp_password.pw_expire = atol(p);
 108                 p += (strlen(p) + 1);
 109                 yp_password.pw_fields |= _PWF_EXPIRE;
 110         }
 111         EXPAND(yp_password.pw_gecos);
 112         yp_password.pw_fields |= _PWF_GECOS;
 113         EXPAND(yp_password.pw_dir);
 114         yp_password.pw_fields |= _PWF_DIR;
 115         EXPAND(yp_password.pw_shell);
 116         yp_password.pw_fields |= _PWF_SHELL;
 117
 118         return;
 119 }
 120
 121 static int
 122 validchars(char *arg)
 123 {
 124         size_t i;
 125
 126         for (i = 0; i < strlen(arg); i++) {
 127                 if (iscntrl(arg[i])) {
 128                         yp_error("string contains a control character");
 129                         return(1);
 130                 }
 131                 if (arg[i] == ':') {
 132                         yp_error("string contains a colon");
 133                         return(1);
 134                 }
 135                 /* Be evil: truncate strings with \n in them silently. */
 136                 if (arg[i] == '\n') {
 137                         arg[i] = '\0';
 138                         return(0);
 139                 }
 140         }
 141         return(0);
 142 }
 143
 144 static int
 145 validate_master(struct passwd *opw __unused, struct x_master_passwd *npw)
 146 {
 147
 148         if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') {
 149                 yp_error("client tried to modify an NIS entry");
 150                 return(1);
 151         }
 152
 153         if (validchars(npw->pw_shell)) {
 154                 yp_error("specified shell contains invalid characters");
 155                 return(1);
 156         }
 157
 158         if (validchars(npw->pw_gecos)) {
 159                 yp_error("specified gecos field contains invalid characters");
 160                 return(1);
 161         }
 162
 163         if (validchars(npw->pw_passwd)) {
 164                 yp_error("specified password contains invalid characters");
 165                 return(1);
 166         }
 167         return(0);
 168 }
 169
 170 static int
 171 validate(struct passwd *opw, struct x_passwd *npw)
 172 {
 173
 174         if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') {
 175                 yp_error("client tried to modify an NIS entry");
 176                 return(1);
 177         }
 178
 179         if ((uid_t)npw->pw_uid != opw->pw_uid) {
 180                 yp_error("UID mismatch: client says user %s has UID %d",
 181                          npw->pw_name, npw->pw_uid);
 182                 yp_error("database says user %s has UID %d", opw->pw_name,
 183                          opw->pw_uid);
 184                 return(1);
 185         }
 186
 187         if ((gid_t)npw->pw_gid != opw->pw_gid) {
 188                 yp_error("GID mismatch: client says user %s has GID %d",
 189                          npw->pw_name, npw->pw_gid);
 190                 yp_error("database says user %s has GID %d", opw->pw_name,
 191                          opw->pw_gid);
 192                 return(1);
 193         }
 194
 195         /*
 196          * Don't allow the user to shoot himself in the foot,
 197          * even on purpose.
 198          */
 199         if (!ok_shell(npw->pw_shell)) {
 200                 yp_error("%s is not a valid shell", npw->pw_shell);
 201                 return(1);
 202         }
 203
 204         if (validchars(npw->pw_shell)) {
 205                 yp_error("specified shell contains invalid characters");
 206                 return(1);
 207         }
 208
 209         if (validchars(npw->pw_gecos)) {
 210                 yp_error("specified gecos field contains invalid characters");
 211                 return(1);
 212         }
 213
 214         if (validchars(npw->pw_passwd)) {
 215                 yp_error("specified password contains invalid characters");
 216                 return(1);
 217         }
 218         return(0);
 219 }
 220
 221 /*
 222  * Kludge alert:
 223  * In order to have one rpc.yppasswdd support multiple domains,
 224  * we have to cheat: we search each directory under /var/yp
 225  * and try to match the user in each master.passwd.byname
 226  * map that we find. If the user matches (username, uid and gid
 227  * all agree), then we use that domain. If we match the user in
 228  * more than one database, we must abort.
 229  */
 230 static char *
 231 find_domain(struct x_passwd *pw)
 232 {
 233         struct stat statbuf;
 234         struct dirent *dirp;
 235         DIR *dird;
 236         char yp_mapdir[MAXPATHLEN + 2];
 237         static char domain[YPMAXDOMAIN];
 238         char *tmp = NULL;
 239         DBT key, data;
 240         int hit = 0;
 241
 242         yp_error("performing multidomain lookup");
 243
 244         if ((dird = opendir(yp_dir)) == NULL) {
 245                 yp_error("opendir(%s) failed: %s", yp_dir, strerror(errno));
 246                 return(NULL);
 247         }
 248
 249         while ((dirp = readdir(dird)) != NULL) {
 250                 snprintf(yp_mapdir, sizeof yp_mapdir, "%s/%s",
 251                                                         yp_dir, dirp->d_name);
 252                 if (stat(yp_mapdir, &statbuf) < 0) {
 253                         yp_error("stat(%s) failed: %s", yp_mapdir,
 254                                                         strerror(errno));
 255                         closedir(dird);
 256                         return(NULL);
 257                 }
 258                 if (S_ISDIR(statbuf.st_mode)) {
 259                         tmp = (char *)dirp->d_name;
 260                         key.data = pw->pw_name;
 261                         key.size = strlen(pw->pw_name);
 262
 263                         if (yp_get_record(tmp,"master.passwd.byname",
 264                                         &key, &data, 0) != YP_TRUE) {
 265                                 continue;
 266                         }
 267                         *((char *)data.data + data.size) = '\0';
 268                         copy_yp_pass(data.data, 1, data.size);
 269                         if (yp_password.pw_uid == (uid_t)pw->pw_uid &&
 270                             yp_password.pw_gid == (gid_t)pw->pw_gid) {
 271                                 hit++;
 272                                 snprintf(domain, YPMAXDOMAIN, "%s", tmp);
 273                         }
 274                 }
 275         }
 276
 277         closedir(dird);
 278         if (hit > 1) {
 279                 yp_error("found same user in two different domains");
 280                 return(NULL);
 281         } else
 282                 return((char *)&domain);
 283 }
 284
 285 static const char *maps[] = {
 286         "master.passwd.byname",
 287         "master.passwd.byuid",
 288         "passwd.byname",
 289         "passwd.byuid"
 290 };
 291
 292 static const char *formats[] = {
 293         "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s",
 294         "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s",
 295         "%s:%s:%d:%d:%s:%s:%s",
 296         "%s:%s:%d:%d:%s:%s:%s"
 297 };
 298
 299 static int
 300 update_inplace(struct passwd *pw, char *domain)
 301 {
 302         DB *dbp = NULL;
 303         DBT key = { NULL, 0 };
 304         DBT data = { NULL, 0 };
 305         char pwbuf[YPMAXRECORD];
 306         char keybuf[20];
 307         int i;
 308         char *ptr = NULL;
 309         static char yp_last[] = "YP_LAST_MODIFIED";
 310         char yplastbuf[YPMAXRECORD];
 311
 312         snprintf(yplastbuf, sizeof yplastbuf, "%llu",
 313             (unsigned long long)time(NULL));
 314
 315         for (i = 0; i < 4; i++) {
 316
 317                 if (i % 2) {
 318                         snprintf(keybuf, sizeof keybuf,
 319                             "%llu", (unsigned long long)pw->pw_uid);
 320                         key.data = &keybuf;
 321                         key.size = strlen(keybuf);
 322                 } else {
 323                         key.data = pw->pw_name;
 324                         key.size = strlen(pw->pw_name);
 325                 }
 326
 327                 /*
 328                  * XXX The passwd.byname and passwd.byuid maps come in
 329                  * two flavors: secure and insecure. The secure version
 330                  * has a '*' in the password field whereas the insecure one
 331                  * has a real crypted password. The maps will be insecure
 332                  * if they were built with 'unsecure = TRUE' enabled in
 333                  * /var/yp/Makefile, but we'd have no way of knowing if
 334                  * this has been done unless we were to try parsing the
 335                  * Makefile, which is a disgusting thought. Instead, we
 336                  * read the records from the maps, skip to the first ':'
 337                  * in them, and then look at the character immediately
 338                  * following it. If it's an '*' then the map is 'secure'
 339                  * and we must not insert a real password into the pw_passwd
 340                  * field. If it's not an '*', then we put the real crypted
 341                  * password in.
 342                  */
 343                 if (yp_get_record(domain,maps[i],&key,&data,1) != YP_TRUE) {
 344                         yp_error("couldn't read %s/%s: %s", domain,
 345                                                 maps[i], strerror(errno));
 346                         return(1);
 347                 }
 348
 349                 if ((ptr = strchr(data.data, ':')) == NULL) {
 350                         yp_error("no colon in passwd record?!");
 351                         return(1);
 352                 }
 353
 354                 /*
 355                  * XXX Supposing we have more than one user with the same
 356                  * UID? (Or more than one user with the same name?) We could
 357                  * end up modifying the wrong record if were not careful.
 358                  */
 359                 if (i % 2) {
 360                         if (strncmp(data.data, pw->pw_name,
 361                                                         strlen(pw->pw_name))) {
 362                                 yp_error("warning: found entry for UID %d "
 363                                     "in map %s@%s with wrong name (%.*s)",
 364                                     pw->pw_uid, maps[i], domain,
 365                                     (int)(ptr - (char *)data.data),
 366                                     (char *)data.data);
 367                                 yp_error("there may be more than one user "
 368                                     "with the same UID - continuing");
 369                                 continue;
 370                         }
 371                 } else {
 372                         /*
 373                          * We're really being ultra-paranoid here.
 374                          * This is generally a 'can't happen' condition.
 375                          */
 376                         snprintf(pwbuf, sizeof pwbuf, ":%d:%d:", pw->pw_uid,
 377                                                                   pw->pw_gid);
 378                         if (!strstr(data.data, pwbuf)) {
 379                                 yp_error("warning: found entry for user %s \
 380 in map %s@%s with wrong UID", pw->pw_name, maps[i], domain);
 381                                 yp_error("there may be more than one user \
 382 with the same name - continuing");
 383                                 continue;
 384                         }
 385                 }
 386
 387                 if (i < 2) {
 388                         snprintf(pwbuf, sizeof pwbuf, formats[i],
 389                            pw->pw_name, pw->pw_passwd, pw->pw_uid,
 390                            pw->pw_gid, pw->pw_class, pw->pw_change,
 391                            pw->pw_expire, pw->pw_gecos, pw->pw_dir,
 392                            pw->pw_shell);
 393                 } else {
 394                         snprintf(pwbuf, sizeof pwbuf, formats[i],
 395                            pw->pw_name, *(ptr+1) == '*' ? "*" : pw->pw_passwd,
 396                            pw->pw_uid, pw->pw_gid, pw->pw_gecos, pw->pw_dir,
 397                            pw->pw_shell);
 398                 }
 399
 400 #define FLAGS O_RDWR|O_CREAT
 401
 402                 if ((dbp = yp_open_db_rw(domain, maps[i], FLAGS)) == NULL) {
 403                         yp_error("couldn't open %s/%s r/w: %s",domain,
 404                                                 maps[i],strerror(errno));
 405                         return(1);
 406                 }
 407
 408                 data.data = pwbuf;
 409                 data.size = strlen(pwbuf);
 410
 411                 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) {
 412                         yp_error("failed to update record in %s/%s", domain,
 413                                                                 maps[i]);
 414                         (dbp->close)(dbp);
 415                         return(1);
 416                 }
 417
 418                 key.data = yp_last;
 419                 key.size = strlen(yp_last);
 420                 data.data = (char *)&yplastbuf;
 421                 data.size = strlen(yplastbuf);
 422
 423                 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) {
 424                         yp_error("failed to update timestamp in %s/%s", domain,
 425                                                                 maps[i]);
 426                         (dbp->close)(dbp);
 427                         return(1);
 428                 }
 429
 430                 (dbp->close)(dbp);
 431         }
 432
 433         return(0);
 434 }
 435
 436 int *
 437 yppasswdproc_update_1_svc(yppasswd *argp, struct svc_req *rqstp)
 438 {
 439         static int  result;
 440         struct sockaddr_in *rqhost;
 441         DBT key, data;
 442         int rval = 0;
 443         int pfd, tfd;
 444         int pid;
 445         int passwd_changed = 0;
 446         int shell_changed = 0;
 447         int gecos_changed = 0;
 448         char *oldshell = NULL;
 449         char *oldgecos = NULL;
 450         char *passfile_hold;
 451         char passfile_buf[MAXPATHLEN + 2];
 452         char passfile_hold_buf[MAXPATHLEN + 2];
 453         char *domain = yppasswd_domain;
 454         static struct sockaddr_in clntaddr;
 455         static struct timeval t_saved, t_test;
 456
 457         /*
 458          * Normal user updates always use the 'default' master.passwd file.
 459          */
 460
 461         passfile = passfile_default;
 462         result = 1;
 463
 464         rqhost = svc_getcaller(rqstp->rq_xprt);
 465
 466         gettimeofday(&t_test, NULL);
 467         if (!bcmp(rqhost, &clntaddr, sizeof *rqhost) &&
 468                 t_test.tv_sec > t_saved.tv_sec &&
 469                 t_test.tv_sec - t_saved.tv_sec < 300) {
 470
 471                 bzero(&clntaddr, sizeof clntaddr);
 472                 bzero(&t_saved, sizeof t_saved);
 473                 return(NULL);
 474         }
 475
 476         bcopy(rqhost, &clntaddr, sizeof clntaddr);
 477         gettimeofday(&t_saved, NULL);
 478
 479         if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) {
 480                 yp_error("rejected update request from unauthorized host");
 481                 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED);
 482                 return(&result);
 483         }
 484
 485         /*
 486          * Step one: find the user. (It's kinda pointless to
 487          * proceed if the user doesn't exist.) We look for the
 488          * user in the master.passwd.byname database, _NOT_ by
 489          * using getpwent() and friends! We can't use getpwent()
 490          * since the NIS master server is not guaranteed to be
 491          * configured as an NIS client.
 492          */
 493
 494         if (multidomain) {
 495                 if ((domain = find_domain(&argp->newpw)) == NULL) {
 496                         yp_error("multidomain lookup failed - aborting update");
 497                         return(&result);
 498                 } else
 499                         yp_error("updating user %s in domain %s",
 500                                         argp->newpw.pw_name, domain);
 501         }
 502
 503         key.data = argp->newpw.pw_name;
 504         key.size = strlen(argp->newpw.pw_name);
 505
 506         if ((rval = yp_get_record(domain,"master.passwd.byname",
 507                         &key, &data, 0)) != YP_TRUE) {
 508                 if (rval == YP_NOKEY) {
 509                         yp_error("user %s not found in passwd database",
 510                                 argp->newpw.pw_name);
 511                 } else {
 512                         yp_error("database access error: %s",
 513                                 yperr_string(rval));
 514                 }
 515                 return(&result);
 516         }
 517
 518         /* Nul terminate, please. */
 519         *((char *)data.data + data.size) = '\0';
 520
 521         copy_yp_pass(data.data, 1, data.size);
 522
 523         /* Step 2: check that the supplied oldpass is valid. */
 524
 525         if (strcmp(crypt(argp->oldpass, yp_password.pw_passwd),
 526                                         yp_password.pw_passwd)) {
 527                 yp_error("rejected change attempt -- bad password");
 528                 yp_error("client address: %s username: %s",
 529                           inet_ntoa(rqhost->sin_addr),
 530                           argp->newpw.pw_name);
 531                 return(&result);
 532         }
 533
 534         /* Step 3: validate the arguments passed to us by the client. */
 535
 536         if (validate(&yp_password, &argp->newpw)) {
 537                 yp_error("rejecting change attempt: bad arguments");
 538                 yp_error("client address: %s username: %s",
 539                          inet_ntoa(rqhost->sin_addr),
 540                          argp->newpw.pw_name);
 541                 svcerr_decode(rqstp->rq_xprt);
 542                 return(&result);
 543         }
 544
 545         /* Step 4: update the user's passwd structure. */
 546
 547         if (!no_chsh && strcmp(argp->newpw.pw_shell, yp_password.pw_shell)) {
 548                 oldshell = yp_password.pw_shell;
 549                 yp_password.pw_shell = argp->newpw.pw_shell;
 550                 shell_changed++;
 551         }
 552
 553
 554         if (!no_chfn && strcmp(argp->newpw.pw_gecos, yp_password.pw_gecos)) {
 555                 oldgecos = yp_password.pw_gecos;
 556                 yp_password.pw_gecos = argp->newpw.pw_gecos;
 557                 gecos_changed++;
 558         }
 559
 560         if (strcmp(argp->newpw.pw_passwd, yp_password.pw_passwd)) {
 561                 yp_password.pw_passwd = argp->newpw.pw_passwd;
 562                 yp_password.pw_change = 0;
 563                 passwd_changed++;
 564         }
 565
 566         /*
 567          * If the caller specified a domain other than our 'default'
 568          * domain, change the path to master.passwd accordingly.
 569          */
 570
 571         if (strcmp(domain, yppasswd_domain)) {
 572                 snprintf(passfile_buf, sizeof(passfile_buf),
 573                         "%s/%s/master.passwd", yp_dir, domain);
 574                 passfile = (char *)&passfile_buf;
 575         }
 576
 577         /*
 578          * Create a filename to hold the original master.passwd
 579          * so if our call to yppwupdate fails we can roll back
 580          */
 581         snprintf(passfile_hold_buf, sizeof(passfile_hold_buf),
 582             "%s.hold", passfile);
 583         passfile_hold = (char *)&passfile_hold_buf;
 584
 585
 586         /* Step 5: make a new password file with the updated info. */
 587
 588         if (pw_init(dirname(passfile), passfile)) {
 589                 yp_error("pw_init() failed");
 590                 return &result;
 591         }
 592         if ((pfd = pw_lock()) == -1) {
 593                 pw_fini();
 594                 yp_error("pw_lock() failed");
 595                 return &result;
 596         }
 597         if ((tfd = pw_tmp(-1)) == -1) {
 598                 pw_fini();
 599                 yp_error("pw_tmp() failed");
 600                 return &result;
 601         }
 602         if (pw_copy(pfd, tfd, &yp_password, NULL) == -1) {
 603                 pw_fini();
 604                 yp_error("pw_copy() failed");
 605                 return &result;
 606         }
 607         if (rename(passfile, passfile_hold) == -1) {
 608                 pw_fini();
 609                 yp_error("rename of %s to %s failed", passfile,
 610                     passfile_hold);
 611                 return &result;
 612         }
 613
 614         if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) {
 615                 /*
 616                  * NIS server is exporting the system's master.passwd.
 617                  * Call pw_mkdb to rebuild passwd and the .db files
 618                  */
 619                 if (pw_mkdb(yp_password.pw_name) == -1) {
 620                         pw_fini();
 621                         yp_error("pw_mkdb() failed");
 622                         rename(passfile_hold, passfile);
 623                         return &result;
 624                 }
 625         } else {
 626                 /*
 627                  * NIS server is exporting a private master.passwd.
 628                  * Rename tempfile into final location
 629                  */
 630                 if (rename(pw_tempname(), passfile) == -1) {
 631                         pw_fini();
 632                         yp_error("rename of %s to %s failed",
 633                             pw_tempname(), passfile);
 634                         rename(passfile_hold, passfile);
 635                         return &result;
 636                 }
 637         }
 638
 639         pw_fini();
 640
 641         if (inplace) {
 642                 if ((rval = update_inplace(&yp_password, domain))) {
 643                         yp_error("inplace update failed -- rebuilding maps");
 644                 }
 645         }
 646
 647         switch ((pid = fork())) {
 648         case 0:
 649                 if (inplace && !rval) {
 650                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
 651                                 yppasswd_domain, "pushpw", NULL);
 652                 } else {
 653                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
 654                                 yppasswd_domain, NULL);
 655                 }
 656                 yp_error("couldn't exec map update process: %s",
 657                                         strerror(errno));
 658                 unlink(passfile);
 659                 rename(passfile_hold, passfile);
 660                 exit(1);
 661                 break;
 662         case -1:
 663                 yp_error("fork() failed: %s", strerror(errno));
 664                 unlink(passfile);
 665                 rename(passfile_hold, passfile);
 666                 return(&result);
 667                 break;
 668         default:
 669                 unlink(passfile_hold);
 670                 break;
 671         }
 672
 673         if (verbose) {
 674                 yp_error("update completed for user %s (uid %d) in %s:",
 675                     argp->newpw.pw_name, argp->newpw.pw_uid, passfile);
 676
 677                 if (passwd_changed)
 678                         yp_error("password changed");
 679
 680                 if (gecos_changed)
 681                         yp_error("gecos changed ('%s' -> '%s')",
 682                                         oldgecos, argp->newpw.pw_gecos);
 683
 684                 if (shell_changed)
 685                         yp_error("shell changed ('%s' -> '%s')",
 686                                         oldshell, argp->newpw.pw_shell);
 687         }
 688
 689         result = 0;
 690         return (&result);
 691 }
 692
 693 /*
 694  * Note that this function performs a little less sanity checking
 695  * than the last one. Since only the superuser is allowed to use it,
 696  * it is assumed that the caller knows what he's doing.
 697  */
 698 int *
 699 yppasswdproc_update_master_1_svc(master_yppasswd *argp, struct svc_req *rqstp)
 700 {
 701         static int result;
 702         int pfd, tfd;
 703         int pid;
 704         uid_t uid;
 705         int rval = 0;
 706         DBT key, data;
 707         char *passfile_hold;
 708         char passfile_buf[MAXPATHLEN + 2];
 709         char passfile_hold_buf[MAXPATHLEN + 2];
 710         struct sockaddr_in *rqhost;
 711         SVCXPRT *transp;
 712
 713         result = 1;
 714         transp = rqstp->rq_xprt;
 715
 716         /*
 717          * NO AF_INET CONNETCIONS ALLOWED!
 718          */
 719         rqhost = svc_getcaller(transp);
 720         if (rqhost->sin_family != AF_UNIX) {
 721                 yp_error("Alert! %s/%d attempted to use superuser-only \
 722 procedure!\n", inet_ntoa(rqhost->sin_addr), rqhost->sin_port);
 723                 svcerr_auth(transp, AUTH_BADCRED);
 724                 return(&result);
 725         }
 726
 727         if (rqstp->rq_cred.oa_flavor != AUTH_SYS) {
 728                 yp_error("caller didn't send proper credentials");
 729                 svcerr_auth(transp, AUTH_BADCRED);
 730                 return(&result);
 731         }
 732
 733         if (__rpc_get_local_uid(transp, &uid) < 0) {
 734                 yp_error("caller didn't send proper credentials");
 735                 svcerr_auth(transp, AUTH_BADCRED);
 736                 return(&result);
 737         }
 738
 739         if (uid) {
 740                 yp_error("caller euid is %d, expecting 0 -- rejecting request",
 741                     uid);
 742                 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED);
 743                 return(&result);
 744         }
 745
 746         passfile = passfile_default;
 747
 748         key.data = argp->newpw.pw_name;
 749         key.size = strlen(argp->newpw.pw_name);
 750
 751         /*
 752          * The superuser may add entries to the passwd maps if
 753          * rpc.yppasswdd is started with the -a flag. Paranoia
 754          * prevents me from allowing additions by default.
 755          */
 756         if ((rval = yp_get_record(argp->domain, "master.passwd.byname",
 757                           &key, &data, 0)) != YP_TRUE) {
 758                 if (rval == YP_NOKEY) {
 759                         yp_error("user %s not found in passwd database",
 760                                  argp->newpw.pw_name);
 761                         if (allow_additions)
 762                                 yp_error("notice: adding user %s to \
 763 master.passwd database for domain %s", argp->newpw.pw_name, argp->domain);
 764                         else
 765                                 yp_error("restart rpc.yppasswdd with the -a flag to \
 766 allow additions to be made to the password database");
 767                 } else {
 768                         yp_error("database access error: %s",
 769                                  yperr_string(rval));
 770                 }
 771                 if (!allow_additions)
 772                         return(&result);
 773         } else {
 774
 775                 /* Nul terminate, please. */
 776                 *((char *)data.data + data.size) = '\0';
 777
 778                 copy_yp_pass(data.data, 1, data.size);
 779         }
 780
 781         /*
 782          * Perform a small bit of sanity checking.
 783          */
 784         if (validate_master(rval == YP_TRUE ? &yp_password:NULL,&argp->newpw)){
 785                 yp_error("rejecting update attempt for %s: bad arguments",
 786                          argp->newpw.pw_name);
 787                 return(&result);
 788         }
 789
 790         /*
 791          * If the caller specified a domain other than our 'default'
 792          * domain, change the path to master.passwd accordingly.
 793          */
 794
 795         if (strcmp(argp->domain, yppasswd_domain)) {
 796                 snprintf(passfile_buf, sizeof(passfile_buf),
 797                         "%s/%s/master.passwd", yp_dir, argp->domain);
 798                 passfile = (char *)&passfile_buf;
 799         }
 800
 801         /*
 802          * Create a filename to hold the original master.passwd
 803          * so if our call to yppwupdate fails we can roll back
 804          */
 805         snprintf(passfile_hold_buf, sizeof(passfile_hold_buf),
 806             "%s.hold", passfile);
 807         passfile_hold = (char *)&passfile_hold_buf;
 808
 809         if (pw_init(dirname(passfile), passfile)) {
 810                 yp_error("pw_init() failed");
 811                 return &result;
 812         }
 813         if ((pfd = pw_lock()) == -1) {
 814                 pw_fini();
 815                 yp_error("pw_lock() failed");
 816                 return &result;
 817         }
 818         if ((tfd = pw_tmp(-1)) == -1) {
 819                 pw_fini();
 820                 yp_error("pw_tmp() failed");
 821                 return &result;
 822         }
 823         if (pw_copy(pfd, tfd, (struct passwd *)&argp->newpw, NULL) == -1) {
 824                 pw_fini();
 825                 yp_error("pw_copy() failed");
 826                 return &result;
 827         }
 828         if (rename(passfile, passfile_hold) == -1) {
 829                 pw_fini();
 830                 yp_error("rename of %s to %s failed", passfile,
 831                     passfile_hold);
 832                 return &result;
 833         }
 834         if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) {
 835                 /*
 836                  * NIS server is exporting the system's master.passwd.
 837                  * Call pw_mkdb to rebuild passwd and the .db files
 838                  */
 839                 if (pw_mkdb(argp->newpw.pw_name) == -1) {
 840                         pw_fini();
 841                         yp_error("pw_mkdb() failed");
 842                         rename(passfile_hold, passfile);
 843                         return &result;
 844                 }
 845         } else {
 846                 /*
 847                  * NIS server is exporting a private master.passwd.
 848                  * Rename tempfile into final location
 849                  */
 850                 if (rename(pw_tempname(), passfile) == -1) {
 851                         pw_fini();
 852                         yp_error("rename of %s to %s failed",
 853                             pw_tempname(), passfile);
 854                         rename(passfile_hold, passfile);
 855                         return &result;
 856                 }
 857         }
 858         pw_fini();
 859
 860         if (inplace) {
 861                 if ((rval = update_inplace((struct passwd *)&argp->newpw,
 862                                                         argp->domain))) {
 863                         yp_error("inplace update failed -- rebuilding maps");
 864                 }
 865         }
 866
 867         switch ((pid = fork())) {
 868         case 0:
 869                 if (inplace && !rval) {
 870                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
 871                                 argp->domain, "pushpw", NULL);
 872                 } else {
 873                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
 874                                 argp->domain, NULL);
 875                 }
 876                 yp_error("couldn't exec map update process: %s",
 877                                         strerror(errno));
 878                 unlink(passfile);
 879                 rename(passfile_hold, passfile);
 880                 exit(1);
 881                 break;
 882         case -1:
 883                 yp_error("fork() failed: %s", strerror(errno));
 884                 unlink(passfile);
 885                 rename(passfile_hold, passfile);
 886                 return(&result);
 887                 break;
 888         default:
 889                 unlink(passfile_hold);
 890                 break;
 891         }
 892
 893         yp_error("performed update of user %s (uid %d) domain %s",
 894                                                 argp->newpw.pw_name,
 895                                                 argp->newpw.pw_uid,
 896                                                 argp->domain);
 897
 898         result = 0;
 899         return(&result);
 900 }