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