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