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 } 139 140 static int 141 validchars(char *arg) 142 { 143 size_t i; 144 145 for (i = 0; i < strlen(arg); i++) { 146 if (iscntrl(arg[i])) { 147 yp_error("string contains a control character"); 148 return(1); 149 } 150 if (arg[i] == ':') { 151 yp_error("string contains a colon"); 152 return(1); 153 } 154 /* Be evil: truncate strings with \n in them silently. */ 155 if (arg[i] == '\n') { 156 arg[i] = '\0'; 157 return(0); 158 } 159 } 160 return(0); 161 } 162 163 static int 164 validate_master(struct passwd *opw __unused, struct x_master_passwd *npw) 165 { 166 167 if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') { 168 yp_error("client tried to modify an NIS entry"); 169 return(1); 170 } 171 172 if (validchars(npw->pw_shell)) { 173 yp_error("specified shell contains invalid characters"); 174 return(1); 175 } 176 177 if (validchars(npw->pw_gecos)) { 178 yp_error("specified gecos field contains invalid characters"); 179 return(1); 180 } 181 182 if (validchars(npw->pw_passwd)) { 183 yp_error("specified password contains invalid characters"); 184 return(1); 185 } 186 return(0); 187 } 188 189 static int 190 validate(struct passwd *opw, struct x_passwd *npw) 191 { 192 193 if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') { 194 yp_error("client tried to modify an NIS entry"); 195 return(1); 196 } 197 198 if ((uid_t)npw->pw_uid != opw->pw_uid) { 199 yp_error("UID mismatch: client says user %s has UID %d", 200 npw->pw_name, npw->pw_uid); 201 yp_error("database says user %s has UID %d", opw->pw_name, 202 opw->pw_uid); 203 return(1); 204 } 205 206 if ((gid_t)npw->pw_gid != opw->pw_gid) { 207 yp_error("GID mismatch: client says user %s has GID %d", 208 npw->pw_name, npw->pw_gid); 209 yp_error("database says user %s has GID %d", opw->pw_name, 210 opw->pw_gid); 211 return(1); 212 } 213 214 /* 215 * Don't allow the user to shoot himself in the foot, 216 * even on purpose. 217 */ 218 if (!no_chsh && !ok_shell(npw->pw_shell)) { 219 yp_error("%s is not a valid shell", npw->pw_shell); 220 return(1); 221 } 222 223 if (!no_chsh && validchars(npw->pw_shell)) { 224 yp_error("specified shell contains invalid characters"); 225 return(1); 226 } 227 228 if (validchars(npw->pw_gecos)) { 229 yp_error("specified gecos field contains invalid characters"); 230 return(1); 231 } 232 233 if (validchars(npw->pw_passwd)) { 234 yp_error("specified password contains invalid characters"); 235 return(1); 236 } 237 return(0); 238 } 239 240 /* 241 * Kludge alert: 242 * In order to have one rpc.yppasswdd support multiple domains, 243 * we have to cheat: we search each directory under /var/yp 244 * and try to match the user in each master.passwd.byname 245 * map that we find. If the user matches (username, uid and gid 246 * all agree), then we use that domain. If we match the user in 247 * more than one database, we must abort. 248 */ 249 static char * 250 find_domain(struct x_passwd *pw) 251 { 252 struct stat statbuf; 253 struct dirent *dirp; 254 DIR *dird; 255 char yp_mapdir[MAXPATHLEN + 2]; 256 static char domain[YPMAXDOMAIN]; 257 char *tmp = NULL; 258 DBT key, data; 259 int hit = 0; 260 261 yp_error("performing multidomain lookup"); 262 263 if ((dird = opendir(yp_dir)) == NULL) { 264 yp_error("opendir(%s) failed: %s", yp_dir, strerror(errno)); 265 return(NULL); 266 } 267 268 while ((dirp = readdir(dird)) != NULL) { 269 snprintf(yp_mapdir, sizeof yp_mapdir, "%s/%s", 270 yp_dir, dirp->d_name); 271 if (stat(yp_mapdir, &statbuf) < 0) { 272 yp_error("stat(%s) failed: %s", yp_mapdir, 273 strerror(errno)); 274 closedir(dird); 275 return(NULL); 276 } 277 if (S_ISDIR(statbuf.st_mode)) { 278 tmp = (char *)dirp->d_name; 279 key.data = pw->pw_name; 280 key.size = strlen(pw->pw_name); 281 282 if (yp_get_record(tmp,"master.passwd.byname", 283 &key, &data, 0) != YP_TRUE) { 284 continue; 285 } 286 *((char *)data.data + data.size) = '\0'; 287 copy_yp_pass(data.data, 1, data.size); 288 if (yp_password.pw_uid == (uid_t)pw->pw_uid && 289 yp_password.pw_gid == (gid_t)pw->pw_gid) { 290 hit++; 291 snprintf(domain, YPMAXDOMAIN, "%s", tmp); 292 } 293 } 294 } 295 296 closedir(dird); 297 if (hit > 1) { 298 yp_error("found same user in two different domains"); 299 return(NULL); 300 } else 301 return((char *)&domain); 302 } 303 304 static const char *maps[] = { 305 "master.passwd.byname", 306 "master.passwd.byuid", 307 "passwd.byname", 308 "passwd.byuid" 309 }; 310 311 static const char *formats[] = { 312 "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s", 313 "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s", 314 "%s:%s:%d:%d:%s:%s:%s", 315 "%s:%s:%d:%d:%s:%s:%s" 316 }; 317 318 static int 319 update_inplace(struct passwd *pw, char *domain) 320 { 321 DB *dbp = NULL; 322 DBT key = { NULL, 0 }; 323 DBT data = { NULL, 0 }; 324 char *pwbuf; 325 char keybuf[20]; 326 int i; 327 char *ptr = NULL; 328 static char yp_last[] = "YP_LAST_MODIFIED"; 329 char yplastbuf[64]; 330 331 snprintf(yplastbuf, sizeof yplastbuf, "%llu", 332 (unsigned long long)time(NULL)); 333 pwbuf = NULL; 334 335 for (i = 0; i < 4; i++) { 336 337 if (i % 2) { 338 snprintf(keybuf, sizeof keybuf, 339 "%llu", (unsigned long long)pw->pw_uid); 340 key.data = &keybuf; 341 key.size = strlen(keybuf); 342 } else { 343 key.data = pw->pw_name; 344 key.size = strlen(pw->pw_name); 345 } 346 347 /* 348 * XXX The passwd.byname and passwd.byuid maps come in 349 * two flavors: secure and insecure. The secure version 350 * has a '*' in the password field whereas the insecure one 351 * has a real crypted password. The maps will be insecure 352 * if they were built with 'unsecure = TRUE' enabled in 353 * /var/yp/Makefile, but we'd have no way of knowing if 354 * this has been done unless we were to try parsing the 355 * Makefile, which is a disgusting thought. Instead, we 356 * read the records from the maps, skip to the first ':' 357 * in them, and then look at the character immediately 358 * following it. If it's an '*' then the map is 'secure' 359 * and we must not insert a real password into the pw_passwd 360 * field. If it's not an '*', then we put the real crypted 361 * password in. 362 */ 363 if (yp_get_record(domain,maps[i],&key,&data,1) != YP_TRUE) { 364 yp_error("couldn't read %s/%s: %s", domain, 365 maps[i], strerror(errno)); 366 goto ret1; 367 } 368 369 if ((ptr = strchr(data.data, ':')) == NULL) { 370 yp_error("no colon in passwd record?!"); 371 goto ret1; 372 } 373 374 /* 375 * XXX Supposing we have more than one user with the same 376 * UID? (Or more than one user with the same name?) We could 377 * end up modifying the wrong record if were not careful. 378 */ 379 if (i % 2) { 380 if (strncmp(data.data, pw->pw_name, 381 strlen(pw->pw_name))) { 382 yp_error("warning: found entry for UID %d \ 383 in map %s@%s with wrong name (%.*s)", pw->pw_uid, maps[i], domain, 384 (int)(ptr - (char *)data.data), 385 (char *)data.data); 386 yp_error("there may be more than one user \ 387 with the same UID - continuing"); 388 continue; 389 } 390 } else { 391 /* 392 * We're really being ultra-paranoid here. 393 * This is generally a 'can't happen' condition. 394 */ 395 free(pwbuf); 396 asprintf(&pwbuf, ":%d:%d:", pw->pw_uid, pw->pw_gid); 397 if (pwbuf == NULL) { 398 yp_error("no memory"); 399 goto ret1; 400 } 401 if (!strstr(data.data, pwbuf)) { 402 yp_error("warning: found entry for user %s \ 403 in map %s@%s with wrong UID", pw->pw_name, maps[i], domain); 404 yp_error("there may be more than one user \ 405 with the same name - continuing"); 406 continue; 407 } 408 } 409 410 if (i < 2) { 411 free(pwbuf); 412 asprintf(&pwbuf, formats[i], 413 pw->pw_name, pw->pw_passwd, pw->pw_uid, 414 pw->pw_gid, pw->pw_class, pw->pw_change, 415 pw->pw_expire, pw->pw_gecos, pw->pw_dir, 416 pw->pw_shell); 417 } else { 418 free(pwbuf); 419 asprintf(&pwbuf, formats[i], 420 pw->pw_name, *(ptr+1) == '*' ? "*" : pw->pw_passwd, 421 pw->pw_uid, pw->pw_gid, pw->pw_gecos, pw->pw_dir, 422 pw->pw_shell); 423 } 424 if (pwbuf == NULL) { 425 yp_error("no memory"); 426 goto ret1; 427 } 428 429 #define FLAGS O_RDWR|O_CREAT 430 431 if ((dbp = yp_open_db_rw(domain, maps[i], FLAGS)) == NULL) { 432 yp_error("couldn't open %s/%s r/w: %s",domain, 433 maps[i],strerror(errno)); 434 goto ret1; 435 } 436 437 data.data = pwbuf; 438 data.size = strlen(pwbuf); 439 440 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) { 441 yp_error("failed to update record in %s/%s", domain, 442 maps[i]); 443 (void)(dbp->close)(dbp); 444 goto ret1; 445 } 446 447 key.data = yp_last; 448 key.size = strlen(yp_last); 449 data.data = (char *)&yplastbuf; 450 data.size = strlen(yplastbuf); 451 452 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) { 453 yp_error("failed to update timestamp in %s/%s", domain, 454 maps[i]); 455 (void)(dbp->close)(dbp); 456 goto ret1; 457 } 458 459 (void)(dbp->close)(dbp); 460 } 461 462 free(pwbuf); 463 return (0); 464 ret1: 465 free(pwbuf); 466 return (1); 467 } 468 469 int * 470 yppasswdproc_update_1_svc(yppasswd *argp, struct svc_req *rqstp) 471 { 472 static int result; 473 struct sockaddr_in *rqhost; 474 DBT key, data; 475 int rval = 0; 476 int pfd, tfd; 477 int pid; 478 int passwd_changed = 0; 479 int shell_changed = 0; 480 int gecos_changed = 0; 481 char *cryptpw; 482 char *oldshell = NULL; 483 char *oldgecos = NULL; 484 char *passdir; 485 char *passfile_hold; 486 char passdir_buf[MAXPATHLEN + 2]; 487 char passfile_buf[MAXPATHLEN + 2]; 488 char passfile_hold_buf[MAXPATHLEN + 2]; 489 char *domain = yppasswd_domain; 490 static struct sockaddr_in clntaddr; 491 static struct timeval t_saved, t_test; 492 493 /* 494 * Normal user updates always use the 'default' master.passwd file. 495 */ 496 497 passfile = passfile_default; 498 result = 1; 499 500 rqhost = svc_getcaller(rqstp->rq_xprt); 501 502 gettimeofday(&t_test, NULL); 503 if (!bcmp(rqhost, &clntaddr, sizeof *rqhost) && 504 t_test.tv_sec > t_saved.tv_sec && 505 t_test.tv_sec - t_saved.tv_sec < 300) { 506 507 bzero(&clntaddr, sizeof clntaddr); 508 bzero(&t_saved, sizeof t_saved); 509 return(NULL); 510 } 511 512 bcopy(rqhost, &clntaddr, sizeof clntaddr); 513 gettimeofday(&t_saved, NULL); 514 515 if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) { 516 yp_error("rejected update request from unauthorized host"); 517 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 518 return(&result); 519 } 520 521 /* 522 * Step one: find the user. (It's kinda pointless to 523 * proceed if the user doesn't exist.) We look for the 524 * user in the master.passwd.byname database, _NOT_ by 525 * using getpwent() and friends! We can't use getpwent() 526 * since the NIS master server is not guaranteed to be 527 * configured as an NIS client. 528 */ 529 530 if (multidomain) { 531 if ((domain = find_domain(&argp->newpw)) == NULL) { 532 yp_error("multidomain lookup failed - aborting update"); 533 return(&result); 534 } else 535 yp_error("updating user %s in domain %s", 536 argp->newpw.pw_name, domain); 537 } 538 539 key.data = argp->newpw.pw_name; 540 key.size = strlen(argp->newpw.pw_name); 541 542 if ((rval = yp_get_record(domain,"master.passwd.byname", 543 &key, &data, 0)) != YP_TRUE) { 544 if (rval == YP_NOKEY) { 545 yp_error("user %s not found in passwd database", 546 argp->newpw.pw_name); 547 } else { 548 yp_error("database access error: %s", 549 yperr_string(rval)); 550 } 551 return(&result); 552 } 553 554 /* Nul terminate, please. */ 555 *((char *)data.data + data.size) = '\0'; 556 557 copy_yp_pass(data.data, 1, data.size); 558 559 /* Step 2: check that the supplied oldpass is valid. */ 560 561 cryptpw = crypt(argp->oldpass, yp_password.pw_passwd); 562 if (cryptpw == NULL || strcmp(cryptpw, yp_password.pw_passwd)) { 563 yp_error("rejected change attempt -- bad password"); 564 yp_error("client address: %s username: %s", 565 inet_ntoa(rqhost->sin_addr), 566 argp->newpw.pw_name); 567 return(&result); 568 } 569 570 /* Step 3: validate the arguments passed to us by the client. */ 571 572 if (validate(&yp_password, &argp->newpw)) { 573 yp_error("rejecting change attempt: bad arguments"); 574 yp_error("client address: %s username: %s", 575 inet_ntoa(rqhost->sin_addr), 576 argp->newpw.pw_name); 577 svcerr_decode(rqstp->rq_xprt); 578 return(&result); 579 } 580 581 /* Step 4: update the user's passwd structure. */ 582 583 if (!no_chsh && strcmp(argp->newpw.pw_shell, yp_password.pw_shell)) { 584 oldshell = yp_password.pw_shell; 585 yp_password.pw_shell = argp->newpw.pw_shell; 586 shell_changed++; 587 } 588 589 590 if (!no_chfn && strcmp(argp->newpw.pw_gecos, yp_password.pw_gecos)) { 591 oldgecos = yp_password.pw_gecos; 592 yp_password.pw_gecos = argp->newpw.pw_gecos; 593 gecos_changed++; 594 } 595 596 if (strcmp(argp->newpw.pw_passwd, yp_password.pw_passwd)) { 597 yp_password.pw_passwd = argp->newpw.pw_passwd; 598 yp_password.pw_change = 0; 599 passwd_changed++; 600 } 601 602 /* 603 * If the caller specified a domain other than our 'default' 604 * domain, change the path to master.passwd accordingly. 605 */ 606 607 if (strcmp(domain, yppasswd_domain)) { 608 snprintf(passfile_buf, sizeof(passfile_buf), 609 "%s/%s/master.passwd", yp_dir, domain); 610 passfile = (char *)&passfile_buf; 611 } 612 613 /* 614 * Create a filename to hold the original master.passwd 615 * so if our call to yppwupdate fails we can roll back 616 */ 617 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf), 618 "%s.hold", passfile); 619 passfile_hold = (char *)&passfile_hold_buf; 620 621 622 /* Step 5: make a new password file with the updated info. */ 623 624 snprintf(passdir_buf, sizeof(passdir_buf), "%s", passfile); 625 passdir = dirname(passdir_buf); 626 627 if (pw_init(passdir, passfile)) { 628 yp_error("pw_init() failed"); 629 return &result; 630 } 631 if ((pfd = pw_lock()) == -1) { 632 pw_fini(); 633 yp_error("pw_lock() failed"); 634 return &result; 635 } 636 if ((tfd = pw_tmp(-1)) == -1) { 637 pw_fini(); 638 yp_error("pw_tmp() failed"); 639 return &result; 640 } 641 if (pw_copy(pfd, tfd, &yp_password, NULL) == -1) { 642 pw_fini(); 643 yp_error("pw_copy() failed"); 644 return &result; 645 } 646 if (rename(passfile, passfile_hold) == -1) { 647 pw_fini(); 648 yp_error("rename of %s to %s failed", passfile, 649 passfile_hold); 650 return &result; 651 } 652 653 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) { 654 /* 655 * NIS server is exporting the system's master.passwd. 656 * Call pw_mkdb to rebuild passwd and the .db files 657 */ 658 if (pw_mkdb(yp_password.pw_name) == -1) { 659 pw_fini(); 660 yp_error("pw_mkdb() failed"); 661 rename(passfile_hold, passfile); 662 return &result; 663 } 664 } else { 665 /* 666 * NIS server is exporting a private master.passwd. 667 * Rename tempfile into final location 668 */ 669 if (rename(pw_tempname(), passfile) == -1) { 670 pw_fini(); 671 yp_error("rename of %s to %s failed", 672 pw_tempname(), passfile); 673 rename(passfile_hold, passfile); 674 return &result; 675 } 676 } 677 678 pw_fini(); 679 680 if (inplace) { 681 if ((rval = update_inplace(&yp_password, domain))) { 682 yp_error("inplace update failed -- rebuilding maps"); 683 } 684 } 685 686 switch ((pid = fork())) { 687 case 0: 688 if (inplace && !rval) { 689 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 690 yppasswd_domain, "pushpw", (char *)NULL); 691 } else { 692 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 693 yppasswd_domain, (char *)NULL); 694 } 695 yp_error("couldn't exec map update process: %s", 696 strerror(errno)); 697 unlink(passfile); 698 rename(passfile_hold, passfile); 699 exit(1); 700 break; 701 case -1: 702 yp_error("fork() failed: %s", strerror(errno)); 703 unlink(passfile); 704 rename(passfile_hold, passfile); 705 return(&result); 706 break; 707 default: 708 unlink(passfile_hold); 709 break; 710 } 711 712 if (verbose) { 713 yp_error("update completed for user %s (uid %d) in %s:", 714 argp->newpw.pw_name, argp->newpw.pw_uid, passfile); 715 716 if (passwd_changed) 717 yp_error("password changed"); 718 719 if (gecos_changed) 720 yp_error("gecos changed ('%s' -> '%s')", 721 oldgecos, argp->newpw.pw_gecos); 722 723 if (shell_changed) 724 yp_error("shell changed ('%s' -> '%s')", 725 oldshell, argp->newpw.pw_shell); 726 } 727 728 result = 0; 729 return (&result); 730 } 731 732 /* 733 * Note that this function performs a little less sanity checking 734 * than the last one. Since only the superuser is allowed to use it, 735 * it is assumed that the caller knows what he's doing. 736 */ 737 int * 738 yppasswdproc_update_master_1_svc(master_yppasswd *argp, 739 struct svc_req *rqstp) 740 { 741 static int result; 742 int pfd, tfd; 743 int pid; 744 uid_t uid; 745 int rval = 0; 746 DBT key, data; 747 char *passdir; 748 char *passfile_hold; 749 char passdir_buf[MAXPATHLEN + 2]; 750 char passfile_buf[MAXPATHLEN + 2]; 751 char passfile_hold_buf[MAXPATHLEN + 2]; 752 struct sockaddr_in *rqhost; 753 SVCXPRT *transp; 754 struct passwd newpasswd; 755 756 result = 1; 757 transp = rqstp->rq_xprt; 758 759 /* 760 * NO AF_INET CONNETCIONS ALLOWED! 761 */ 762 rqhost = svc_getcaller(transp); 763 if (rqhost->sin_family != AF_UNIX) { 764 yp_error("Alert! %s/%d attempted to use superuser-only \ 765 procedure!\n", inet_ntoa(rqhost->sin_addr), rqhost->sin_port); 766 svcerr_auth(transp, AUTH_BADCRED); 767 return(&result); 768 } 769 770 if (rqstp->rq_cred.oa_flavor != AUTH_SYS) { 771 yp_error("caller didn't send proper credentials"); 772 svcerr_auth(transp, AUTH_BADCRED); 773 return(&result); 774 } 775 776 if (__rpc_get_local_uid(transp, &uid) < 0) { 777 yp_error("caller didn't send proper credentials"); 778 svcerr_auth(transp, AUTH_BADCRED); 779 return(&result); 780 } 781 782 if (uid) { 783 yp_error("caller euid is %d, expecting 0 -- rejecting request", 784 uid); 785 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 786 return(&result); 787 } 788 789 passfile = passfile_default; 790 791 key.data = argp->newpw.pw_name; 792 key.size = strlen(argp->newpw.pw_name); 793 794 /* 795 * The superuser may add entries to the passwd maps if 796 * rpc.yppasswdd is started with the -a flag. Paranoia 797 * prevents me from allowing additions by default. 798 */ 799 if ((rval = yp_get_record(argp->domain, "master.passwd.byname", 800 &key, &data, 0)) != YP_TRUE) { 801 if (rval == YP_NOKEY) { 802 yp_error("user %s not found in passwd database", 803 argp->newpw.pw_name); 804 if (allow_additions) 805 yp_error("notice: adding user %s to \ 806 master.passwd database for domain %s", argp->newpw.pw_name, argp->domain); 807 else 808 yp_error("restart rpc.yppasswdd with the -a flag to \ 809 allow additions to be made to the password database"); 810 } else { 811 yp_error("database access error: %s", 812 yperr_string(rval)); 813 } 814 if (!allow_additions) 815 return(&result); 816 } else { 817 818 /* Nul terminate, please. */ 819 *((char *)data.data + data.size) = '\0'; 820 821 copy_yp_pass(data.data, 1, data.size); 822 } 823 824 /* 825 * Perform a small bit of sanity checking. 826 */ 827 if (validate_master(rval == YP_TRUE ? &yp_password:NULL,&argp->newpw)){ 828 yp_error("rejecting update attempt for %s: bad arguments", 829 argp->newpw.pw_name); 830 return(&result); 831 } 832 833 /* 834 * If the caller specified a domain other than our 'default' 835 * domain, change the path to master.passwd accordingly. 836 */ 837 838 if (strcmp(argp->domain, yppasswd_domain)) { 839 snprintf(passfile_buf, sizeof(passfile_buf), 840 "%s/%s/master.passwd", yp_dir, argp->domain); 841 passfile = (char *)&passfile_buf; 842 } 843 844 /* 845 * Create a filename to hold the original master.passwd 846 * so if our call to yppwupdate fails we can roll back 847 */ 848 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf), 849 "%s.hold", passfile); 850 passfile_hold = (char *)&passfile_hold_buf; 851 852 snprintf(passdir_buf, sizeof(passdir_buf), "%s", passfile); 853 passdir = dirname(passdir_buf); 854 855 if (pw_init(passdir, passfile)) { 856 yp_error("pw_init() failed"); 857 return &result; 858 } 859 if ((pfd = pw_lock()) == -1) { 860 pw_fini(); 861 yp_error("pw_lock() failed"); 862 return &result; 863 } 864 if ((tfd = pw_tmp(-1)) == -1) { 865 pw_fini(); 866 yp_error("pw_tmp() failed"); 867 return &result; 868 } 869 xlate_passwd(&argp->newpw, &newpasswd); 870 if (pw_copy(pfd, tfd, &newpasswd, NULL) == -1) { 871 pw_fini(); 872 yp_error("pw_copy() failed"); 873 return &result; 874 } 875 if (rename(passfile, passfile_hold) == -1) { 876 pw_fini(); 877 yp_error("rename of %s to %s failed", passfile, 878 passfile_hold); 879 return &result; 880 } 881 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) { 882 /* 883 * NIS server is exporting the system's master.passwd. 884 * Call pw_mkdb to rebuild passwd and the .db files 885 */ 886 if (pw_mkdb(argp->newpw.pw_name) == -1) { 887 pw_fini(); 888 yp_error("pw_mkdb() failed"); 889 rename(passfile_hold, passfile); 890 return &result; 891 } 892 } else { 893 /* 894 * NIS server is exporting a private master.passwd. 895 * Rename tempfile into final location 896 */ 897 if (rename(pw_tempname(), passfile) == -1) { 898 pw_fini(); 899 yp_error("rename of %s to %s failed", 900 pw_tempname(), passfile); 901 rename(passfile_hold, passfile); 902 return &result; 903 } 904 } 905 pw_fini(); 906 907 if (inplace) { 908 xlate_passwd(&argp->newpw, &newpasswd); 909 if ((rval = update_inplace(&newpasswd, argp->domain))) { 910 yp_error("inplace update failed -- rebuilding maps"); 911 } 912 } 913 914 switch ((pid = fork())) { 915 case 0: 916 if (inplace && !rval) { 917 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 918 argp->domain, "pushpw", (char *)NULL); 919 } else { 920 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 921 argp->domain, (char *)NULL); 922 } 923 yp_error("couldn't exec map update process: %s", 924 strerror(errno)); 925 unlink(passfile); 926 rename(passfile_hold, passfile); 927 exit(1); 928 break; 929 case -1: 930 yp_error("fork() failed: %s", strerror(errno)); 931 unlink(passfile); 932 rename(passfile_hold, passfile); 933 return(&result); 934 break; 935 default: 936 unlink(passfile_hold); 937 break; 938 } 939 940 yp_error("performed update of user %s (uid %d) domain %s", 941 argp->newpw.pw_name, 942 argp->newpw.pw_uid, 943 argp->domain); 944 945 result = 0; 946 return(&result); 947 } 948