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