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 *passfile_hold; 472 char passfile_buf[MAXPATHLEN + 2]; 473 char passfile_hold_buf[MAXPATHLEN + 2]; 474 char *domain = yppasswd_domain; 475 static struct sockaddr_in clntaddr; 476 static struct timeval t_saved, t_test; 477 478 /* 479 * Normal user updates always use the 'default' master.passwd file. 480 */ 481 482 passfile = passfile_default; 483 result = 1; 484 485 rqhost = svc_getcaller(rqstp->rq_xprt); 486 487 gettimeofday(&t_test, NULL); 488 if (!bcmp(rqhost, &clntaddr, sizeof *rqhost) && 489 t_test.tv_sec > t_saved.tv_sec && 490 t_test.tv_sec - t_saved.tv_sec < 300) { 491 492 bzero(&clntaddr, sizeof clntaddr); 493 bzero(&t_saved, sizeof t_saved); 494 return(NULL); 495 } 496 497 bcopy(rqhost, &clntaddr, sizeof clntaddr); 498 gettimeofday(&t_saved, NULL); 499 500 if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) { 501 yp_error("rejected update request from unauthorized host"); 502 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 503 return(&result); 504 } 505 506 /* 507 * Step one: find the user. (It's kinda pointless to 508 * proceed if the user doesn't exist.) We look for the 509 * user in the master.passwd.byname database, _NOT_ by 510 * using getpwent() and friends! We can't use getpwent() 511 * since the NIS master server is not guaranteed to be 512 * configured as an NIS client. 513 */ 514 515 if (multidomain) { 516 if ((domain = find_domain(&argp->newpw)) == NULL) { 517 yp_error("multidomain lookup failed - aborting update"); 518 return(&result); 519 } else 520 yp_error("updating user %s in domain %s", 521 argp->newpw.pw_name, domain); 522 } 523 524 key.data = argp->newpw.pw_name; 525 key.size = strlen(argp->newpw.pw_name); 526 527 if ((rval = yp_get_record(domain,"master.passwd.byname", 528 &key, &data, 0)) != YP_TRUE) { 529 if (rval == YP_NOKEY) { 530 yp_error("user %s not found in passwd database", 531 argp->newpw.pw_name); 532 } else { 533 yp_error("database access error: %s", 534 yperr_string(rval)); 535 } 536 return(&result); 537 } 538 539 /* Nul terminate, please. */ 540 *((char *)data.data + data.size) = '\0'; 541 542 copy_yp_pass(data.data, 1, data.size); 543 544 /* Step 2: check that the supplied oldpass is valid. */ 545 546 cryptpw = crypt(argp->oldpass, yp_password.pw_passwd); 547 if (cryptpw == NULL || strcmp(cryptpw, yp_password.pw_passwd)) { 548 yp_error("rejected change attempt -- bad password"); 549 yp_error("client address: %s username: %s", 550 inet_ntoa(rqhost->sin_addr), 551 argp->newpw.pw_name); 552 return(&result); 553 } 554 555 /* Step 3: validate the arguments passed to us by the client. */ 556 557 if (validate(&yp_password, &argp->newpw)) { 558 yp_error("rejecting change attempt: bad arguments"); 559 yp_error("client address: %s username: %s", 560 inet_ntoa(rqhost->sin_addr), 561 argp->newpw.pw_name); 562 svcerr_decode(rqstp->rq_xprt); 563 return(&result); 564 } 565 566 /* Step 4: update the user's passwd structure. */ 567 568 if (!no_chsh && strcmp(argp->newpw.pw_shell, yp_password.pw_shell)) { 569 oldshell = yp_password.pw_shell; 570 yp_password.pw_shell = argp->newpw.pw_shell; 571 shell_changed++; 572 } 573 574 575 if (!no_chfn && strcmp(argp->newpw.pw_gecos, yp_password.pw_gecos)) { 576 oldgecos = yp_password.pw_gecos; 577 yp_password.pw_gecos = argp->newpw.pw_gecos; 578 gecos_changed++; 579 } 580 581 if (strcmp(argp->newpw.pw_passwd, yp_password.pw_passwd)) { 582 yp_password.pw_passwd = argp->newpw.pw_passwd; 583 yp_password.pw_change = 0; 584 passwd_changed++; 585 } 586 587 /* 588 * If the caller specified a domain other than our 'default' 589 * domain, change the path to master.passwd accordingly. 590 */ 591 592 if (strcmp(domain, yppasswd_domain)) { 593 snprintf(passfile_buf, sizeof(passfile_buf), 594 "%s/%s/master.passwd", yp_dir, domain); 595 passfile = (char *)&passfile_buf; 596 } 597 598 /* 599 * Create a filename to hold the original master.passwd 600 * so if our call to yppwupdate fails we can roll back 601 */ 602 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf), 603 "%s.hold", passfile); 604 passfile_hold = (char *)&passfile_hold_buf; 605 606 607 /* Step 5: make a new password file with the updated info. */ 608 609 if (pw_init(dirname(passfile), passfile)) { 610 yp_error("pw_init() failed"); 611 return &result; 612 } 613 if ((pfd = pw_lock()) == -1) { 614 pw_fini(); 615 yp_error("pw_lock() failed"); 616 return &result; 617 } 618 if ((tfd = pw_tmp(-1)) == -1) { 619 pw_fini(); 620 yp_error("pw_tmp() failed"); 621 return &result; 622 } 623 if (pw_copy(pfd, tfd, &yp_password, NULL) == -1) { 624 pw_fini(); 625 yp_error("pw_copy() failed"); 626 return &result; 627 } 628 if (rename(passfile, passfile_hold) == -1) { 629 pw_fini(); 630 yp_error("rename of %s to %s failed", passfile, 631 passfile_hold); 632 return &result; 633 } 634 635 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) { 636 /* 637 * NIS server is exporting the system's master.passwd. 638 * Call pw_mkdb to rebuild passwd and the .db files 639 */ 640 if (pw_mkdb(yp_password.pw_name) == -1) { 641 pw_fini(); 642 yp_error("pw_mkdb() failed"); 643 rename(passfile_hold, passfile); 644 return &result; 645 } 646 } else { 647 /* 648 * NIS server is exporting a private master.passwd. 649 * Rename tempfile into final location 650 */ 651 if (rename(pw_tempname(), passfile) == -1) { 652 pw_fini(); 653 yp_error("rename of %s to %s failed", 654 pw_tempname(), passfile); 655 rename(passfile_hold, passfile); 656 return &result; 657 } 658 } 659 660 pw_fini(); 661 662 if (inplace) { 663 if ((rval = update_inplace(&yp_password, domain))) { 664 yp_error("inplace update failed -- rebuilding maps"); 665 } 666 } 667 668 switch ((pid = fork())) { 669 case 0: 670 if (inplace && !rval) { 671 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 672 yppasswd_domain, "pushpw", (char *)NULL); 673 } else { 674 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 675 yppasswd_domain, (char *)NULL); 676 } 677 yp_error("couldn't exec map update process: %s", 678 strerror(errno)); 679 unlink(passfile); 680 rename(passfile_hold, passfile); 681 exit(1); 682 break; 683 case -1: 684 yp_error("fork() failed: %s", strerror(errno)); 685 unlink(passfile); 686 rename(passfile_hold, passfile); 687 return(&result); 688 break; 689 default: 690 unlink(passfile_hold); 691 break; 692 } 693 694 if (verbose) { 695 yp_error("update completed for user %s (uid %d) in %s:", 696 argp->newpw.pw_name, argp->newpw.pw_uid, passfile); 697 698 if (passwd_changed) 699 yp_error("password changed"); 700 701 if (gecos_changed) 702 yp_error("gecos changed ('%s' -> '%s')", 703 oldgecos, argp->newpw.pw_gecos); 704 705 if (shell_changed) 706 yp_error("shell changed ('%s' -> '%s')", 707 oldshell, argp->newpw.pw_shell); 708 } 709 710 result = 0; 711 return (&result); 712 } 713 714 /* 715 * Note that this function performs a little less sanity checking 716 * than the last one. Since only the superuser is allowed to use it, 717 * it is assumed that the caller knows what he's doing. 718 */ 719 int * 720 yppasswdproc_update_master_1_svc(master_yppasswd *argp, 721 struct svc_req *rqstp) 722 { 723 static int result; 724 int pfd, tfd; 725 int pid; 726 uid_t uid; 727 int rval = 0; 728 DBT key, data; 729 char *passfile_hold; 730 char passfile_buf[MAXPATHLEN + 2]; 731 char passfile_hold_buf[MAXPATHLEN + 2]; 732 struct sockaddr_in *rqhost; 733 SVCXPRT *transp; 734 struct passwd newpasswd; 735 736 result = 1; 737 transp = rqstp->rq_xprt; 738 739 /* 740 * NO AF_INET CONNETCIONS ALLOWED! 741 */ 742 rqhost = svc_getcaller(transp); 743 if (rqhost->sin_family != AF_UNIX) { 744 yp_error("Alert! %s/%d attempted to use superuser-only \ 745 procedure!\n", inet_ntoa(rqhost->sin_addr), rqhost->sin_port); 746 svcerr_auth(transp, AUTH_BADCRED); 747 return(&result); 748 } 749 750 if (rqstp->rq_cred.oa_flavor != AUTH_SYS) { 751 yp_error("caller didn't send proper credentials"); 752 svcerr_auth(transp, AUTH_BADCRED); 753 return(&result); 754 } 755 756 if (__rpc_get_local_uid(transp, &uid) < 0) { 757 yp_error("caller didn't send proper credentials"); 758 svcerr_auth(transp, AUTH_BADCRED); 759 return(&result); 760 } 761 762 if (uid) { 763 yp_error("caller euid is %d, expecting 0 -- rejecting request", 764 uid); 765 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 766 return(&result); 767 } 768 769 passfile = passfile_default; 770 771 key.data = argp->newpw.pw_name; 772 key.size = strlen(argp->newpw.pw_name); 773 774 /* 775 * The superuser may add entries to the passwd maps if 776 * rpc.yppasswdd is started with the -a flag. Paranoia 777 * prevents me from allowing additions by default. 778 */ 779 if ((rval = yp_get_record(argp->domain, "master.passwd.byname", 780 &key, &data, 0)) != YP_TRUE) { 781 if (rval == YP_NOKEY) { 782 yp_error("user %s not found in passwd database", 783 argp->newpw.pw_name); 784 if (allow_additions) 785 yp_error("notice: adding user %s to \ 786 master.passwd database for domain %s", argp->newpw.pw_name, argp->domain); 787 else 788 yp_error("restart rpc.yppasswdd with the -a flag to \ 789 allow additions to be made to the password database"); 790 } else { 791 yp_error("database access error: %s", 792 yperr_string(rval)); 793 } 794 if (!allow_additions) 795 return(&result); 796 } else { 797 798 /* Nul terminate, please. */ 799 *((char *)data.data + data.size) = '\0'; 800 801 copy_yp_pass(data.data, 1, data.size); 802 } 803 804 /* 805 * Perform a small bit of sanity checking. 806 */ 807 if (validate_master(rval == YP_TRUE ? &yp_password:NULL,&argp->newpw)){ 808 yp_error("rejecting update attempt for %s: bad arguments", 809 argp->newpw.pw_name); 810 return(&result); 811 } 812 813 /* 814 * If the caller specified a domain other than our 'default' 815 * domain, change the path to master.passwd accordingly. 816 */ 817 818 if (strcmp(argp->domain, yppasswd_domain)) { 819 snprintf(passfile_buf, sizeof(passfile_buf), 820 "%s/%s/master.passwd", yp_dir, argp->domain); 821 passfile = (char *)&passfile_buf; 822 } 823 824 /* 825 * Create a filename to hold the original master.passwd 826 * so if our call to yppwupdate fails we can roll back 827 */ 828 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf), 829 "%s.hold", passfile); 830 passfile_hold = (char *)&passfile_hold_buf; 831 832 if (pw_init(dirname(passfile), passfile)) { 833 yp_error("pw_init() failed"); 834 return &result; 835 } 836 if ((pfd = pw_lock()) == -1) { 837 pw_fini(); 838 yp_error("pw_lock() failed"); 839 return &result; 840 } 841 if ((tfd = pw_tmp(-1)) == -1) { 842 pw_fini(); 843 yp_error("pw_tmp() failed"); 844 return &result; 845 } 846 xlate_passwd(&argp->newpw, &newpasswd); 847 if (pw_copy(pfd, tfd, &newpasswd, NULL) == -1) { 848 pw_fini(); 849 yp_error("pw_copy() failed"); 850 return &result; 851 } 852 if (rename(passfile, passfile_hold) == -1) { 853 pw_fini(); 854 yp_error("rename of %s to %s failed", passfile, 855 passfile_hold); 856 return &result; 857 } 858 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) { 859 /* 860 * NIS server is exporting the system's master.passwd. 861 * Call pw_mkdb to rebuild passwd and the .db files 862 */ 863 if (pw_mkdb(argp->newpw.pw_name) == -1) { 864 pw_fini(); 865 yp_error("pw_mkdb() failed"); 866 rename(passfile_hold, passfile); 867 return &result; 868 } 869 } else { 870 /* 871 * NIS server is exporting a private master.passwd. 872 * Rename tempfile into final location 873 */ 874 if (rename(pw_tempname(), passfile) == -1) { 875 pw_fini(); 876 yp_error("rename of %s to %s failed", 877 pw_tempname(), passfile); 878 rename(passfile_hold, passfile); 879 return &result; 880 } 881 } 882 pw_fini(); 883 884 if (inplace) { 885 xlate_passwd(&argp->newpw, &newpasswd); 886 if ((rval = update_inplace(&newpasswd, argp->domain))) { 887 yp_error("inplace update failed -- rebuilding maps"); 888 } 889 } 890 891 switch ((pid = fork())) { 892 case 0: 893 if (inplace && !rval) { 894 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 895 argp->domain, "pushpw", (char *)NULL); 896 } else { 897 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 898 argp->domain, (char *)NULL); 899 } 900 yp_error("couldn't exec map update process: %s", 901 strerror(errno)); 902 unlink(passfile); 903 rename(passfile_hold, passfile); 904 exit(1); 905 break; 906 case -1: 907 yp_error("fork() failed: %s", strerror(errno)); 908 unlink(passfile); 909 rename(passfile_hold, passfile); 910 return(&result); 911 break; 912 default: 913 unlink(passfile_hold); 914 break; 915 } 916 917 yp_error("performed update of user %s (uid %d) domain %s", 918 argp->newpw.pw_name, 919 argp->newpw.pw_uid, 920 argp->domain); 921 922 result = 0; 923 return(&result); 924 } 925