1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1995, 1996 5 * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Bill Paul. 18 * 4. Neither the name of the author nor the names of any co-contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #include <sys/param.h> 37 #include <sys/fcntl.h> 38 #include <sys/socket.h> 39 #include <sys/stat.h> 40 #include <sys/wait.h> 41 42 #include <arpa/inet.h> 43 #include <netinet/in.h> 44 45 #include <ctype.h> 46 #include <db.h> 47 #include <dirent.h> 48 #include <errno.h> 49 #include <limits.h> 50 #include <pwd.h> 51 #include <signal.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 57 #include <libgen.h> 58 #include <libutil.h> 59 60 #include <rpc/rpc.h> 61 #include <rpcsvc/yp.h> 62 struct dom_binding; 63 #include <rpcsvc/ypclnt.h> 64 #include "yppasswdd_extern.h" 65 #include "yppasswd.h" 66 #include "yppasswd_private.h" 67 #include "ypxfr_extern.h" 68 #include "yp_extern.h" 69 70 static struct passwd yp_password; 71 72 static void 73 xlate_passwd(struct x_master_passwd *xpwd, struct passwd *pwd) 74 { 75 pwd->pw_name = xpwd->pw_name; 76 pwd->pw_passwd = xpwd->pw_passwd; 77 pwd->pw_uid = xpwd->pw_uid; 78 pwd->pw_gid = xpwd->pw_gid; 79 pwd->pw_change = xpwd->pw_change; 80 pwd->pw_class = xpwd->pw_class; 81 pwd->pw_gecos = xpwd->pw_gecos; 82 pwd->pw_dir = xpwd->pw_dir; 83 pwd->pw_shell = xpwd->pw_shell; 84 pwd->pw_expire = xpwd->pw_expire; 85 pwd->pw_fields = xpwd->pw_fields; 86 } 87 88 static void 89 copy_yp_pass(char *p, int x, int m) 90 { 91 char *t, *s = p; 92 static char *buf; 93 94 yp_password.pw_fields = 0; 95 96 buf = realloc(buf, m + 10); 97 bzero(buf, m + 10); 98 99 /* Turn all colons into NULLs */ 100 while (strchr(s, ':')) { 101 s = (strchr(s, ':') + 1); 102 *(s - 1)= '\0'; 103 } 104 105 t = buf; 106 #define EXPAND(e) do { \ 107 e = t; \ 108 while ((*t++ = *p++)); \ 109 } while (0) 110 EXPAND(yp_password.pw_name); 111 yp_password.pw_fields |= _PWF_NAME; 112 EXPAND(yp_password.pw_passwd); 113 yp_password.pw_fields |= _PWF_PASSWD; 114 yp_password.pw_uid = atoi(p); 115 p += (strlen(p) + 1); 116 yp_password.pw_fields |= _PWF_UID; 117 yp_password.pw_gid = atoi(p); 118 p += (strlen(p) + 1); 119 yp_password.pw_fields |= _PWF_GID; 120 if (x) { 121 EXPAND(yp_password.pw_class); 122 yp_password.pw_fields |= _PWF_CLASS; 123 yp_password.pw_change = atol(p); 124 p += (strlen(p) + 1); 125 yp_password.pw_fields |= _PWF_CHANGE; 126 yp_password.pw_expire = atol(p); 127 p += (strlen(p) + 1); 128 yp_password.pw_fields |= _PWF_EXPIRE; 129 } 130 EXPAND(yp_password.pw_gecos); 131 yp_password.pw_fields |= _PWF_GECOS; 132 EXPAND(yp_password.pw_dir); 133 yp_password.pw_fields |= _PWF_DIR; 134 EXPAND(yp_password.pw_shell); 135 yp_password.pw_fields |= _PWF_SHELL; 136 } 137 138 static int 139 validchars(char *arg) 140 { 141 size_t i; 142 143 for (i = 0; i < strlen(arg); i++) { 144 if (iscntrl(arg[i])) { 145 yp_error("string contains a control character"); 146 return(1); 147 } 148 if (arg[i] == ':') { 149 yp_error("string contains a colon"); 150 return(1); 151 } 152 /* Be evil: truncate strings with \n in them silently. */ 153 if (arg[i] == '\n') { 154 arg[i] = '\0'; 155 return(0); 156 } 157 } 158 return(0); 159 } 160 161 static int 162 validate_master(struct passwd *opw __unused, struct x_master_passwd *npw) 163 { 164 165 if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') { 166 yp_error("client tried to modify an NIS entry"); 167 return(1); 168 } 169 170 if (validchars(npw->pw_shell)) { 171 yp_error("specified shell contains invalid characters"); 172 return(1); 173 } 174 175 if (validchars(npw->pw_gecos)) { 176 yp_error("specified gecos field contains invalid characters"); 177 return(1); 178 } 179 180 if (validchars(npw->pw_passwd)) { 181 yp_error("specified password contains invalid characters"); 182 return(1); 183 } 184 return(0); 185 } 186 187 static int 188 validate(struct passwd *opw, struct x_passwd *npw) 189 { 190 191 if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') { 192 yp_error("client tried to modify an NIS entry"); 193 return(1); 194 } 195 196 if ((uid_t)npw->pw_uid != opw->pw_uid) { 197 yp_error("UID mismatch: client says user %s has UID %d", 198 npw->pw_name, npw->pw_uid); 199 yp_error("database says user %s has UID %d", opw->pw_name, 200 opw->pw_uid); 201 return(1); 202 } 203 204 if ((gid_t)npw->pw_gid != opw->pw_gid) { 205 yp_error("GID mismatch: client says user %s has GID %d", 206 npw->pw_name, npw->pw_gid); 207 yp_error("database says user %s has GID %d", opw->pw_name, 208 opw->pw_gid); 209 return(1); 210 } 211 212 /* 213 * Don't allow the user to shoot himself in the foot, 214 * even on purpose. 215 */ 216 if (!no_chsh && !ok_shell(npw->pw_shell)) { 217 yp_error("%s is not a valid shell", npw->pw_shell); 218 return(1); 219 } 220 221 if (!no_chsh && validchars(npw->pw_shell)) { 222 yp_error("specified shell contains invalid characters"); 223 return(1); 224 } 225 226 if (validchars(npw->pw_gecos)) { 227 yp_error("specified gecos field contains invalid characters"); 228 return(1); 229 } 230 231 if (validchars(npw->pw_passwd)) { 232 yp_error("specified password contains invalid characters"); 233 return(1); 234 } 235 return(0); 236 } 237 238 /* 239 * Kludge alert: 240 * In order to have one rpc.yppasswdd support multiple domains, 241 * we have to cheat: we search each directory under /var/yp 242 * and try to match the user in each master.passwd.byname 243 * map that we find. If the user matches (username, uid and gid 244 * all agree), then we use that domain. If we match the user in 245 * more than one database, we must abort. 246 */ 247 static char * 248 find_domain(struct x_passwd *pw) 249 { 250 struct stat statbuf; 251 struct dirent *dirp; 252 DIR *dird; 253 char yp_mapdir[MAXPATHLEN + 2]; 254 static char domain[YPMAXDOMAIN]; 255 char *tmp = NULL; 256 DBT key, data; 257 int hit = 0; 258 259 yp_error("performing multidomain lookup"); 260 261 if ((dird = opendir(yp_dir)) == NULL) { 262 yp_error("opendir(%s) failed: %s", yp_dir, strerror(errno)); 263 return(NULL); 264 } 265 266 while ((dirp = readdir(dird)) != NULL) { 267 snprintf(yp_mapdir, sizeof yp_mapdir, "%s/%s", 268 yp_dir, dirp->d_name); 269 if (stat(yp_mapdir, &statbuf) < 0) { 270 yp_error("stat(%s) failed: %s", yp_mapdir, 271 strerror(errno)); 272 closedir(dird); 273 return(NULL); 274 } 275 if (S_ISDIR(statbuf.st_mode)) { 276 tmp = (char *)dirp->d_name; 277 key.data = pw->pw_name; 278 key.size = strlen(pw->pw_name); 279 280 if (yp_get_record(tmp,"master.passwd.byname", 281 &key, &data, 0) != YP_TRUE) { 282 continue; 283 } 284 *((char *)data.data + data.size) = '\0'; 285 copy_yp_pass(data.data, 1, data.size); 286 if (yp_password.pw_uid == (uid_t)pw->pw_uid && 287 yp_password.pw_gid == (gid_t)pw->pw_gid) { 288 hit++; 289 snprintf(domain, YPMAXDOMAIN, "%s", tmp); 290 } 291 } 292 } 293 294 closedir(dird); 295 if (hit > 1) { 296 yp_error("found same user in two different domains"); 297 return(NULL); 298 } else 299 return((char *)&domain); 300 } 301 302 static const char *maps[] = { 303 "master.passwd.byname", 304 "master.passwd.byuid", 305 "passwd.byname", 306 "passwd.byuid" 307 }; 308 309 static const char *formats[] = { 310 "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s", 311 "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s", 312 "%s:%s:%d:%d:%s:%s:%s", 313 "%s:%s:%d:%d:%s:%s:%s" 314 }; 315 316 static int 317 update_inplace(struct passwd *pw, char *domain) 318 { 319 DB *dbp = NULL; 320 DBT key = { NULL, 0 }; 321 DBT data = { NULL, 0 }; 322 char *pwbuf; 323 char keybuf[20]; 324 int i; 325 char *ptr = NULL; 326 static char yp_last[] = "YP_LAST_MODIFIED"; 327 char yplastbuf[64]; 328 329 snprintf(yplastbuf, sizeof yplastbuf, "%llu", 330 (unsigned long long)time(NULL)); 331 pwbuf = NULL; 332 333 for (i = 0; i < 4; i++) { 334 335 if (i % 2) { 336 snprintf(keybuf, sizeof keybuf, 337 "%llu", (unsigned long long)pw->pw_uid); 338 key.data = &keybuf; 339 key.size = strlen(keybuf); 340 } else { 341 key.data = pw->pw_name; 342 key.size = strlen(pw->pw_name); 343 } 344 345 /* 346 * XXX The passwd.byname and passwd.byuid maps come in 347 * two flavors: secure and insecure. The secure version 348 * has a '*' in the password field whereas the insecure one 349 * has a real crypted password. The maps will be insecure 350 * if they were built with 'unsecure = TRUE' enabled in 351 * /var/yp/Makefile, but we'd have no way of knowing if 352 * this has been done unless we were to try parsing the 353 * Makefile, which is a disgusting thought. Instead, we 354 * read the records from the maps, skip to the first ':' 355 * in them, and then look at the character immediately 356 * following it. If it's an '*' then the map is 'secure' 357 * and we must not insert a real password into the pw_passwd 358 * field. If it's not an '*', then we put the real crypted 359 * password in. 360 */ 361 if (yp_get_record(domain,maps[i],&key,&data,1) != YP_TRUE) { 362 yp_error("couldn't read %s/%s: %s", domain, 363 maps[i], strerror(errno)); 364 goto ret1; 365 } 366 367 if ((ptr = strchr(data.data, ':')) == NULL) { 368 yp_error("no colon in passwd record?!"); 369 goto ret1; 370 } 371 372 /* 373 * XXX Supposing we have more than one user with the same 374 * UID? (Or more than one user with the same name?) We could 375 * end up modifying the wrong record if were not careful. 376 */ 377 if (i % 2) { 378 if (strncmp(data.data, pw->pw_name, 379 strlen(pw->pw_name))) { 380 yp_error("warning: found entry for UID %d \ 381 in map %s@%s with wrong name (%.*s)", pw->pw_uid, maps[i], domain, 382 (int)(ptr - (char *)data.data), 383 (char *)data.data); 384 yp_error("there may be more than one user \ 385 with the same UID - continuing"); 386 continue; 387 } 388 } else { 389 /* 390 * We're really being ultra-paranoid here. 391 * This is generally a 'can't happen' condition. 392 */ 393 free(pwbuf); 394 asprintf(&pwbuf, ":%d:%d:", pw->pw_uid, pw->pw_gid); 395 if (pwbuf == NULL) { 396 yp_error("no memory"); 397 goto ret1; 398 } 399 if (!strstr(data.data, pwbuf)) { 400 yp_error("warning: found entry for user %s \ 401 in map %s@%s with wrong UID", pw->pw_name, maps[i], domain); 402 yp_error("there may be more than one user \ 403 with the same name - continuing"); 404 continue; 405 } 406 } 407 408 if (i < 2) { 409 free(pwbuf); 410 asprintf(&pwbuf, formats[i], 411 pw->pw_name, pw->pw_passwd, pw->pw_uid, 412 pw->pw_gid, pw->pw_class, pw->pw_change, 413 pw->pw_expire, pw->pw_gecos, pw->pw_dir, 414 pw->pw_shell); 415 } else { 416 free(pwbuf); 417 asprintf(&pwbuf, formats[i], 418 pw->pw_name, *(ptr+1) == '*' ? "*" : pw->pw_passwd, 419 pw->pw_uid, pw->pw_gid, pw->pw_gecos, pw->pw_dir, 420 pw->pw_shell); 421 } 422 if (pwbuf == NULL) { 423 yp_error("no memory"); 424 goto ret1; 425 } 426 427 #define FLAGS O_RDWR|O_CREAT 428 429 if ((dbp = yp_open_db_rw(domain, maps[i], FLAGS)) == NULL) { 430 yp_error("couldn't open %s/%s r/w: %s",domain, 431 maps[i],strerror(errno)); 432 goto ret1; 433 } 434 435 data.data = pwbuf; 436 data.size = strlen(pwbuf); 437 438 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) { 439 yp_error("failed to update record in %s/%s", domain, 440 maps[i]); 441 (void)(dbp->close)(dbp); 442 goto ret1; 443 } 444 445 key.data = yp_last; 446 key.size = strlen(yp_last); 447 data.data = (char *)&yplastbuf; 448 data.size = strlen(yplastbuf); 449 450 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) { 451 yp_error("failed to update timestamp in %s/%s", domain, 452 maps[i]); 453 (void)(dbp->close)(dbp); 454 goto ret1; 455 } 456 457 (void)(dbp->close)(dbp); 458 } 459 460 free(pwbuf); 461 return (0); 462 ret1: 463 free(pwbuf); 464 return (1); 465 } 466 467 int * 468 yppasswdproc_update_1_svc(yppasswd *argp, struct svc_req *rqstp) 469 { 470 static int result; 471 struct sockaddr_in *rqhost; 472 DBT key, data; 473 int rval = 0; 474 int pfd, tfd; 475 int pid; 476 int passwd_changed = 0; 477 int shell_changed = 0; 478 int gecos_changed = 0; 479 char *cryptpw; 480 char *oldshell = NULL; 481 char *oldgecos = NULL; 482 char *passdir; 483 char *passfile_hold; 484 char passdir_buf[MAXPATHLEN + 2]; 485 char passfile_buf[MAXPATHLEN + 2]; 486 char passfile_hold_buf[MAXPATHLEN + 2]; 487 char *domain = yppasswd_domain; 488 static struct sockaddr_in clntaddr; 489 static struct timeval t_saved, t_test; 490 491 /* 492 * Normal user updates always use the 'default' master.passwd file. 493 */ 494 495 passfile = passfile_default; 496 result = 1; 497 498 rqhost = svc_getcaller(rqstp->rq_xprt); 499 500 gettimeofday(&t_test, NULL); 501 if (!bcmp(rqhost, &clntaddr, sizeof *rqhost) && 502 t_test.tv_sec > t_saved.tv_sec && 503 t_test.tv_sec - t_saved.tv_sec < 300) { 504 505 bzero(&clntaddr, sizeof clntaddr); 506 bzero(&t_saved, sizeof t_saved); 507 return(NULL); 508 } 509 510 bcopy(rqhost, &clntaddr, sizeof clntaddr); 511 gettimeofday(&t_saved, NULL); 512 513 if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) { 514 yp_error("rejected update request from unauthorized host"); 515 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 516 return(&result); 517 } 518 519 /* 520 * Step one: find the user. (It's kinda pointless to 521 * proceed if the user doesn't exist.) We look for the 522 * user in the master.passwd.byname database, _NOT_ by 523 * using getpwent() and friends! We can't use getpwent() 524 * since the NIS master server is not guaranteed to be 525 * configured as an NIS client. 526 */ 527 528 if (multidomain) { 529 if ((domain = find_domain(&argp->newpw)) == NULL) { 530 yp_error("multidomain lookup failed - aborting update"); 531 return(&result); 532 } else 533 yp_error("updating user %s in domain %s", 534 argp->newpw.pw_name, domain); 535 } 536 537 key.data = argp->newpw.pw_name; 538 key.size = strlen(argp->newpw.pw_name); 539 540 if ((rval = yp_get_record(domain,"master.passwd.byname", 541 &key, &data, 0)) != YP_TRUE) { 542 if (rval == YP_NOKEY) { 543 yp_error("user %s not found in passwd database", 544 argp->newpw.pw_name); 545 } else { 546 yp_error("database access error: %s", 547 yperr_string(rval)); 548 } 549 return(&result); 550 } 551 552 /* Nul terminate, please. */ 553 *((char *)data.data + data.size) = '\0'; 554 555 copy_yp_pass(data.data, 1, data.size); 556 557 /* Step 2: check that the supplied oldpass is valid. */ 558 559 cryptpw = crypt(argp->oldpass, yp_password.pw_passwd); 560 if (cryptpw == NULL || strcmp(cryptpw, yp_password.pw_passwd)) { 561 yp_error("rejected change attempt -- bad password"); 562 yp_error("client address: %s username: %s", 563 inet_ntoa(rqhost->sin_addr), 564 argp->newpw.pw_name); 565 return(&result); 566 } 567 568 /* Step 3: validate the arguments passed to us by the client. */ 569 570 if (validate(&yp_password, &argp->newpw)) { 571 yp_error("rejecting change attempt: bad arguments"); 572 yp_error("client address: %s username: %s", 573 inet_ntoa(rqhost->sin_addr), 574 argp->newpw.pw_name); 575 svcerr_decode(rqstp->rq_xprt); 576 return(&result); 577 } 578 579 /* Step 4: update the user's passwd structure. */ 580 581 if (!no_chsh && strcmp(argp->newpw.pw_shell, yp_password.pw_shell)) { 582 oldshell = yp_password.pw_shell; 583 yp_password.pw_shell = argp->newpw.pw_shell; 584 shell_changed++; 585 } 586 587 588 if (!no_chfn && strcmp(argp->newpw.pw_gecos, yp_password.pw_gecos)) { 589 oldgecos = yp_password.pw_gecos; 590 yp_password.pw_gecos = argp->newpw.pw_gecos; 591 gecos_changed++; 592 } 593 594 if (strcmp(argp->newpw.pw_passwd, yp_password.pw_passwd)) { 595 yp_password.pw_passwd = argp->newpw.pw_passwd; 596 yp_password.pw_change = 0; 597 passwd_changed++; 598 } 599 600 /* 601 * If the caller specified a domain other than our 'default' 602 * domain, change the path to master.passwd accordingly. 603 */ 604 605 if (strcmp(domain, yppasswd_domain)) { 606 snprintf(passfile_buf, sizeof(passfile_buf), 607 "%s/%s/master.passwd", yp_dir, domain); 608 passfile = (char *)&passfile_buf; 609 } 610 611 /* 612 * Create a filename to hold the original master.passwd 613 * so if our call to yppwupdate fails we can roll back 614 */ 615 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf), 616 "%s.hold", passfile); 617 passfile_hold = (char *)&passfile_hold_buf; 618 619 620 /* Step 5: make a new password file with the updated info. */ 621 622 snprintf(passdir_buf, sizeof(passdir_buf), "%s", passfile); 623 passdir = dirname(passdir_buf); 624 625 if (pw_init(passdir, passfile)) { 626 yp_error("pw_init() failed"); 627 return &result; 628 } 629 if ((pfd = pw_lock()) == -1) { 630 pw_fini(); 631 yp_error("pw_lock() failed"); 632 return &result; 633 } 634 if ((tfd = pw_tmp(-1)) == -1) { 635 pw_fini(); 636 yp_error("pw_tmp() failed"); 637 return &result; 638 } 639 if (pw_copy(pfd, tfd, &yp_password, NULL) == -1) { 640 pw_fini(); 641 yp_error("pw_copy() failed"); 642 return &result; 643 } 644 if (rename(passfile, passfile_hold) == -1) { 645 pw_fini(); 646 yp_error("rename of %s to %s failed", passfile, 647 passfile_hold); 648 return &result; 649 } 650 651 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) { 652 /* 653 * NIS server is exporting the system's master.passwd. 654 * Call pw_mkdb to rebuild passwd and the .db files 655 */ 656 if (pw_mkdb(yp_password.pw_name) == -1) { 657 pw_fini(); 658 yp_error("pw_mkdb() failed"); 659 rename(passfile_hold, passfile); 660 return &result; 661 } 662 } else { 663 /* 664 * NIS server is exporting a private master.passwd. 665 * Rename tempfile into final location 666 */ 667 if (rename(pw_tempname(), passfile) == -1) { 668 pw_fini(); 669 yp_error("rename of %s to %s failed", 670 pw_tempname(), passfile); 671 rename(passfile_hold, passfile); 672 return &result; 673 } 674 } 675 676 pw_fini(); 677 678 if (inplace) { 679 if ((rval = update_inplace(&yp_password, domain))) { 680 yp_error("inplace update failed -- rebuilding maps"); 681 } 682 } 683 684 switch ((pid = fork())) { 685 case 0: 686 if (inplace && !rval) { 687 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 688 yppasswd_domain, "pushpw", (char *)NULL); 689 } else { 690 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 691 yppasswd_domain, (char *)NULL); 692 } 693 yp_error("couldn't exec map update process: %s", 694 strerror(errno)); 695 unlink(passfile); 696 rename(passfile_hold, passfile); 697 exit(1); 698 break; 699 case -1: 700 yp_error("fork() failed: %s", strerror(errno)); 701 unlink(passfile); 702 rename(passfile_hold, passfile); 703 return(&result); 704 break; 705 default: 706 unlink(passfile_hold); 707 break; 708 } 709 710 if (verbose) { 711 yp_error("update completed for user %s (uid %d) in %s:", 712 argp->newpw.pw_name, argp->newpw.pw_uid, passfile); 713 714 if (passwd_changed) 715 yp_error("password changed"); 716 717 if (gecos_changed) 718 yp_error("gecos changed ('%s' -> '%s')", 719 oldgecos, argp->newpw.pw_gecos); 720 721 if (shell_changed) 722 yp_error("shell changed ('%s' -> '%s')", 723 oldshell, argp->newpw.pw_shell); 724 } 725 726 result = 0; 727 return (&result); 728 } 729 730 /* 731 * Note that this function performs a little less sanity checking 732 * than the last one. Since only the superuser is allowed to use it, 733 * it is assumed that the caller knows what he's doing. 734 */ 735 int * 736 yppasswdproc_update_master_1_svc(master_yppasswd *argp, 737 struct svc_req *rqstp) 738 { 739 static int result; 740 int pfd, tfd; 741 int pid; 742 uid_t uid; 743 int rval = 0; 744 DBT key, data; 745 char *passdir; 746 char *passfile_hold; 747 char passdir_buf[MAXPATHLEN + 2]; 748 char passfile_buf[MAXPATHLEN + 2]; 749 char passfile_hold_buf[MAXPATHLEN + 2]; 750 struct sockaddr_in *rqhost; 751 SVCXPRT *transp; 752 struct passwd newpasswd; 753 754 result = 1; 755 transp = rqstp->rq_xprt; 756 757 /* 758 * NO AF_INET CONNETCIONS ALLOWED! 759 */ 760 rqhost = svc_getcaller(transp); 761 if (rqhost->sin_family != AF_UNIX) { 762 yp_error("Alert! %s/%d attempted to use superuser-only \ 763 procedure!\n", inet_ntoa(rqhost->sin_addr), rqhost->sin_port); 764 svcerr_auth(transp, AUTH_BADCRED); 765 return(&result); 766 } 767 768 if (rqstp->rq_cred.oa_flavor != AUTH_SYS) { 769 yp_error("caller didn't send proper credentials"); 770 svcerr_auth(transp, AUTH_BADCRED); 771 return(&result); 772 } 773 774 if (__rpc_get_local_uid(transp, &uid) < 0) { 775 yp_error("caller didn't send proper credentials"); 776 svcerr_auth(transp, AUTH_BADCRED); 777 return(&result); 778 } 779 780 if (uid) { 781 yp_error("caller euid is %d, expecting 0 -- rejecting request", 782 uid); 783 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 784 return(&result); 785 } 786 787 passfile = passfile_default; 788 789 key.data = argp->newpw.pw_name; 790 key.size = strlen(argp->newpw.pw_name); 791 792 /* 793 * The superuser may add entries to the passwd maps if 794 * rpc.yppasswdd is started with the -a flag. Paranoia 795 * prevents me from allowing additions by default. 796 */ 797 if ((rval = yp_get_record(argp->domain, "master.passwd.byname", 798 &key, &data, 0)) != YP_TRUE) { 799 if (rval == YP_NOKEY) { 800 yp_error("user %s not found in passwd database", 801 argp->newpw.pw_name); 802 if (allow_additions) 803 yp_error("notice: adding user %s to \ 804 master.passwd database for domain %s", argp->newpw.pw_name, argp->domain); 805 else 806 yp_error("restart rpc.yppasswdd with the -a flag to \ 807 allow additions to be made to the password database"); 808 } else { 809 yp_error("database access error: %s", 810 yperr_string(rval)); 811 } 812 if (!allow_additions) 813 return(&result); 814 } else { 815 816 /* Nul terminate, please. */ 817 *((char *)data.data + data.size) = '\0'; 818 819 copy_yp_pass(data.data, 1, data.size); 820 } 821 822 /* 823 * Perform a small bit of sanity checking. 824 */ 825 if (validate_master(rval == YP_TRUE ? &yp_password:NULL,&argp->newpw)){ 826 yp_error("rejecting update attempt for %s: bad arguments", 827 argp->newpw.pw_name); 828 return(&result); 829 } 830 831 /* 832 * If the caller specified a domain other than our 'default' 833 * domain, change the path to master.passwd accordingly. 834 */ 835 836 if (strcmp(argp->domain, yppasswd_domain)) { 837 snprintf(passfile_buf, sizeof(passfile_buf), 838 "%s/%s/master.passwd", yp_dir, argp->domain); 839 passfile = (char *)&passfile_buf; 840 } 841 842 /* 843 * Create a filename to hold the original master.passwd 844 * so if our call to yppwupdate fails we can roll back 845 */ 846 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf), 847 "%s.hold", passfile); 848 passfile_hold = (char *)&passfile_hold_buf; 849 850 snprintf(passdir_buf, sizeof(passdir_buf), "%s", passfile); 851 passdir = dirname(passdir_buf); 852 853 if (pw_init(passdir, passfile)) { 854 yp_error("pw_init() failed"); 855 return &result; 856 } 857 if ((pfd = pw_lock()) == -1) { 858 pw_fini(); 859 yp_error("pw_lock() failed"); 860 return &result; 861 } 862 if ((tfd = pw_tmp(-1)) == -1) { 863 pw_fini(); 864 yp_error("pw_tmp() failed"); 865 return &result; 866 } 867 xlate_passwd(&argp->newpw, &newpasswd); 868 if (pw_copy(pfd, tfd, &newpasswd, NULL) == -1) { 869 pw_fini(); 870 yp_error("pw_copy() failed"); 871 return &result; 872 } 873 if (rename(passfile, passfile_hold) == -1) { 874 pw_fini(); 875 yp_error("rename of %s to %s failed", passfile, 876 passfile_hold); 877 return &result; 878 } 879 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) { 880 /* 881 * NIS server is exporting the system's master.passwd. 882 * Call pw_mkdb to rebuild passwd and the .db files 883 */ 884 if (pw_mkdb(argp->newpw.pw_name) == -1) { 885 pw_fini(); 886 yp_error("pw_mkdb() failed"); 887 rename(passfile_hold, passfile); 888 return &result; 889 } 890 } else { 891 /* 892 * NIS server is exporting a private master.passwd. 893 * Rename tempfile into final location 894 */ 895 if (rename(pw_tempname(), passfile) == -1) { 896 pw_fini(); 897 yp_error("rename of %s to %s failed", 898 pw_tempname(), passfile); 899 rename(passfile_hold, passfile); 900 return &result; 901 } 902 } 903 pw_fini(); 904 905 if (inplace) { 906 xlate_passwd(&argp->newpw, &newpasswd); 907 if ((rval = update_inplace(&newpasswd, argp->domain))) { 908 yp_error("inplace update failed -- rebuilding maps"); 909 } 910 } 911 912 switch ((pid = fork())) { 913 case 0: 914 if (inplace && !rval) { 915 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 916 argp->domain, "pushpw", (char *)NULL); 917 } else { 918 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 919 argp->domain, (char *)NULL); 920 } 921 yp_error("couldn't exec map update process: %s", 922 strerror(errno)); 923 unlink(passfile); 924 rename(passfile_hold, passfile); 925 exit(1); 926 break; 927 case -1: 928 yp_error("fork() failed: %s", strerror(errno)); 929 unlink(passfile); 930 rename(passfile_hold, passfile); 931 return(&result); 932 break; 933 default: 934 unlink(passfile_hold); 935 break; 936 } 937 938 yp_error("performed update of user %s (uid %d) domain %s", 939 argp->newpw.pw_name, 940 argp->newpw.pw_uid, 941 argp->domain); 942 943 result = 0; 944 return(&result); 945 } 946