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; 327 char keybuf[20]; 328 int i; 329 char *ptr = NULL; 330 static char yp_last[] = "YP_LAST_MODIFIED"; 331 char yplastbuf[64]; 332 333 snprintf(yplastbuf, sizeof yplastbuf, "%llu", 334 (unsigned long long)time(NULL)); 335 pwbuf = NULL; 336 337 for (i = 0; i < 4; i++) { 338 339 if (i % 2) { 340 snprintf(keybuf, sizeof keybuf, 341 "%llu", (unsigned long long)pw->pw_uid); 342 key.data = &keybuf; 343 key.size = strlen(keybuf); 344 } else { 345 key.data = pw->pw_name; 346 key.size = strlen(pw->pw_name); 347 } 348 349 /* 350 * XXX The passwd.byname and passwd.byuid maps come in 351 * two flavors: secure and insecure. The secure version 352 * has a '*' in the password field whereas the insecure one 353 * has a real crypted password. The maps will be insecure 354 * if they were built with 'unsecure = TRUE' enabled in 355 * /var/yp/Makefile, but we'd have no way of knowing if 356 * this has been done unless we were to try parsing the 357 * Makefile, which is a disgusting thought. Instead, we 358 * read the records from the maps, skip to the first ':' 359 * in them, and then look at the character immediately 360 * following it. If it's an '*' then the map is 'secure' 361 * and we must not insert a real password into the pw_passwd 362 * field. If it's not an '*', then we put the real crypted 363 * password in. 364 */ 365 if (yp_get_record(domain,maps[i],&key,&data,1) != YP_TRUE) { 366 yp_error("couldn't read %s/%s: %s", domain, 367 maps[i], strerror(errno)); 368 goto ret1; 369 } 370 371 if ((ptr = strchr(data.data, ':')) == NULL) { 372 yp_error("no colon in passwd record?!"); 373 goto ret1; 374 } 375 376 /* 377 * XXX Supposing we have more than one user with the same 378 * UID? (Or more than one user with the same name?) We could 379 * end up modifying the wrong record if were not careful. 380 */ 381 if (i % 2) { 382 if (strncmp(data.data, pw->pw_name, 383 strlen(pw->pw_name))) { 384 yp_error("warning: found entry for UID %d \ 385 in map %s@%s with wrong name (%.*s)", pw->pw_uid, maps[i], domain, 386 (int)(ptr - (char *)data.data), 387 (char *)data.data); 388 yp_error("there may be more than one user \ 389 with the same UID - continuing"); 390 continue; 391 } 392 } else { 393 /* 394 * We're really being ultra-paranoid here. 395 * This is generally a 'can't happen' condition. 396 */ 397 free(pwbuf); 398 asprintf(&pwbuf, ":%d:%d:", pw->pw_uid, pw->pw_gid); 399 if (pwbuf == NULL) { 400 yp_error("no memory"); 401 goto ret1; 402 } 403 if (!strstr(data.data, pwbuf)) { 404 yp_error("warning: found entry for user %s \ 405 in map %s@%s with wrong UID", pw->pw_name, maps[i], domain); 406 yp_error("there may be more than one user \ 407 with the same name - continuing"); 408 continue; 409 } 410 } 411 412 if (i < 2) { 413 free(pwbuf); 414 asprintf(&pwbuf, formats[i], 415 pw->pw_name, pw->pw_passwd, pw->pw_uid, 416 pw->pw_gid, pw->pw_class, pw->pw_change, 417 pw->pw_expire, pw->pw_gecos, pw->pw_dir, 418 pw->pw_shell); 419 } else { 420 free(pwbuf); 421 asprintf(&pwbuf, formats[i], 422 pw->pw_name, *(ptr+1) == '*' ? "*" : pw->pw_passwd, 423 pw->pw_uid, pw->pw_gid, pw->pw_gecos, pw->pw_dir, 424 pw->pw_shell); 425 } 426 if (pwbuf == NULL) { 427 yp_error("no memory"); 428 goto ret1; 429 } 430 431 #define FLAGS O_RDWR|O_CREAT 432 433 if ((dbp = yp_open_db_rw(domain, maps[i], FLAGS)) == NULL) { 434 yp_error("couldn't open %s/%s r/w: %s",domain, 435 maps[i],strerror(errno)); 436 goto ret1; 437 } 438 439 data.data = pwbuf; 440 data.size = strlen(pwbuf); 441 442 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) { 443 yp_error("failed to update record in %s/%s", domain, 444 maps[i]); 445 (void)(dbp->close)(dbp); 446 goto ret1; 447 } 448 449 key.data = yp_last; 450 key.size = strlen(yp_last); 451 data.data = (char *)&yplastbuf; 452 data.size = strlen(yplastbuf); 453 454 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) { 455 yp_error("failed to update timestamp in %s/%s", domain, 456 maps[i]); 457 (void)(dbp->close)(dbp); 458 goto ret1; 459 } 460 461 (void)(dbp->close)(dbp); 462 } 463 464 free(pwbuf); 465 return (0); 466 ret1: 467 free(pwbuf); 468 return (1); 469 } 470 471 int * 472 yppasswdproc_update_1_svc(yppasswd *argp, struct svc_req *rqstp) 473 { 474 static int result; 475 struct sockaddr_in *rqhost; 476 DBT key, data; 477 int rval = 0; 478 int pfd, tfd; 479 int pid; 480 int passwd_changed = 0; 481 int shell_changed = 0; 482 int gecos_changed = 0; 483 char *cryptpw; 484 char *oldshell = NULL; 485 char *oldgecos = NULL; 486 char *passdir; 487 char *passfile_hold; 488 char passdir_buf[MAXPATHLEN + 2]; 489 char passfile_buf[MAXPATHLEN + 2]; 490 char passfile_hold_buf[MAXPATHLEN + 2]; 491 char *domain = yppasswd_domain; 492 static struct sockaddr_in clntaddr; 493 static struct timeval t_saved, t_test; 494 495 /* 496 * Normal user updates always use the 'default' master.passwd file. 497 */ 498 499 passfile = passfile_default; 500 result = 1; 501 502 rqhost = svc_getcaller(rqstp->rq_xprt); 503 504 gettimeofday(&t_test, NULL); 505 if (!bcmp(rqhost, &clntaddr, sizeof *rqhost) && 506 t_test.tv_sec > t_saved.tv_sec && 507 t_test.tv_sec - t_saved.tv_sec < 300) { 508 509 bzero(&clntaddr, sizeof clntaddr); 510 bzero(&t_saved, sizeof t_saved); 511 return(NULL); 512 } 513 514 bcopy(rqhost, &clntaddr, sizeof clntaddr); 515 gettimeofday(&t_saved, NULL); 516 517 if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) { 518 yp_error("rejected update request from unauthorized host"); 519 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 520 return(&result); 521 } 522 523 /* 524 * Step one: find the user. (It's kinda pointless to 525 * proceed if the user doesn't exist.) We look for the 526 * user in the master.passwd.byname database, _NOT_ by 527 * using getpwent() and friends! We can't use getpwent() 528 * since the NIS master server is not guaranteed to be 529 * configured as an NIS client. 530 */ 531 532 if (multidomain) { 533 if ((domain = find_domain(&argp->newpw)) == NULL) { 534 yp_error("multidomain lookup failed - aborting update"); 535 return(&result); 536 } else 537 yp_error("updating user %s in domain %s", 538 argp->newpw.pw_name, domain); 539 } 540 541 key.data = argp->newpw.pw_name; 542 key.size = strlen(argp->newpw.pw_name); 543 544 if ((rval = yp_get_record(domain,"master.passwd.byname", 545 &key, &data, 0)) != YP_TRUE) { 546 if (rval == YP_NOKEY) { 547 yp_error("user %s not found in passwd database", 548 argp->newpw.pw_name); 549 } else { 550 yp_error("database access error: %s", 551 yperr_string(rval)); 552 } 553 return(&result); 554 } 555 556 /* Nul terminate, please. */ 557 *((char *)data.data + data.size) = '\0'; 558 559 copy_yp_pass(data.data, 1, data.size); 560 561 /* Step 2: check that the supplied oldpass is valid. */ 562 563 cryptpw = crypt(argp->oldpass, yp_password.pw_passwd); 564 if (cryptpw == NULL || strcmp(cryptpw, yp_password.pw_passwd)) { 565 yp_error("rejected change attempt -- bad password"); 566 yp_error("client address: %s username: %s", 567 inet_ntoa(rqhost->sin_addr), 568 argp->newpw.pw_name); 569 return(&result); 570 } 571 572 /* Step 3: validate the arguments passed to us by the client. */ 573 574 if (validate(&yp_password, &argp->newpw)) { 575 yp_error("rejecting change attempt: bad arguments"); 576 yp_error("client address: %s username: %s", 577 inet_ntoa(rqhost->sin_addr), 578 argp->newpw.pw_name); 579 svcerr_decode(rqstp->rq_xprt); 580 return(&result); 581 } 582 583 /* Step 4: update the user's passwd structure. */ 584 585 if (!no_chsh && strcmp(argp->newpw.pw_shell, yp_password.pw_shell)) { 586 oldshell = yp_password.pw_shell; 587 yp_password.pw_shell = argp->newpw.pw_shell; 588 shell_changed++; 589 } 590 591 592 if (!no_chfn && strcmp(argp->newpw.pw_gecos, yp_password.pw_gecos)) { 593 oldgecos = yp_password.pw_gecos; 594 yp_password.pw_gecos = argp->newpw.pw_gecos; 595 gecos_changed++; 596 } 597 598 if (strcmp(argp->newpw.pw_passwd, yp_password.pw_passwd)) { 599 yp_password.pw_passwd = argp->newpw.pw_passwd; 600 yp_password.pw_change = 0; 601 passwd_changed++; 602 } 603 604 /* 605 * If the caller specified a domain other than our 'default' 606 * domain, change the path to master.passwd accordingly. 607 */ 608 609 if (strcmp(domain, yppasswd_domain)) { 610 snprintf(passfile_buf, sizeof(passfile_buf), 611 "%s/%s/master.passwd", yp_dir, domain); 612 passfile = (char *)&passfile_buf; 613 } 614 615 /* 616 * Create a filename to hold the original master.passwd 617 * so if our call to yppwupdate fails we can roll back 618 */ 619 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf), 620 "%s.hold", passfile); 621 passfile_hold = (char *)&passfile_hold_buf; 622 623 624 /* Step 5: make a new password file with the updated info. */ 625 626 snprintf(passdir_buf, sizeof(passdir_buf), "%s", passfile); 627 passdir = dirname(passdir_buf); 628 629 if (pw_init(passdir, passfile)) { 630 yp_error("pw_init() failed"); 631 return &result; 632 } 633 if ((pfd = pw_lock()) == -1) { 634 pw_fini(); 635 yp_error("pw_lock() failed"); 636 return &result; 637 } 638 if ((tfd = pw_tmp(-1)) == -1) { 639 pw_fini(); 640 yp_error("pw_tmp() failed"); 641 return &result; 642 } 643 if (pw_copy(pfd, tfd, &yp_password, NULL) == -1) { 644 pw_fini(); 645 yp_error("pw_copy() failed"); 646 return &result; 647 } 648 if (rename(passfile, passfile_hold) == -1) { 649 pw_fini(); 650 yp_error("rename of %s to %s failed", passfile, 651 passfile_hold); 652 return &result; 653 } 654 655 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) { 656 /* 657 * NIS server is exporting the system's master.passwd. 658 * Call pw_mkdb to rebuild passwd and the .db files 659 */ 660 if (pw_mkdb(yp_password.pw_name) == -1) { 661 pw_fini(); 662 yp_error("pw_mkdb() failed"); 663 rename(passfile_hold, passfile); 664 return &result; 665 } 666 } else { 667 /* 668 * NIS server is exporting a private master.passwd. 669 * Rename tempfile into final location 670 */ 671 if (rename(pw_tempname(), passfile) == -1) { 672 pw_fini(); 673 yp_error("rename of %s to %s failed", 674 pw_tempname(), passfile); 675 rename(passfile_hold, passfile); 676 return &result; 677 } 678 } 679 680 pw_fini(); 681 682 if (inplace) { 683 if ((rval = update_inplace(&yp_password, domain))) { 684 yp_error("inplace update failed -- rebuilding maps"); 685 } 686 } 687 688 switch ((pid = fork())) { 689 case 0: 690 if (inplace && !rval) { 691 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 692 yppasswd_domain, "pushpw", (char *)NULL); 693 } else { 694 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 695 yppasswd_domain, (char *)NULL); 696 } 697 yp_error("couldn't exec map update process: %s", 698 strerror(errno)); 699 unlink(passfile); 700 rename(passfile_hold, passfile); 701 exit(1); 702 break; 703 case -1: 704 yp_error("fork() failed: %s", strerror(errno)); 705 unlink(passfile); 706 rename(passfile_hold, passfile); 707 return(&result); 708 break; 709 default: 710 unlink(passfile_hold); 711 break; 712 } 713 714 if (verbose) { 715 yp_error("update completed for user %s (uid %d) in %s:", 716 argp->newpw.pw_name, argp->newpw.pw_uid, passfile); 717 718 if (passwd_changed) 719 yp_error("password changed"); 720 721 if (gecos_changed) 722 yp_error("gecos changed ('%s' -> '%s')", 723 oldgecos, argp->newpw.pw_gecos); 724 725 if (shell_changed) 726 yp_error("shell changed ('%s' -> '%s')", 727 oldshell, argp->newpw.pw_shell); 728 } 729 730 result = 0; 731 return (&result); 732 } 733 734 /* 735 * Note that this function performs a little less sanity checking 736 * than the last one. Since only the superuser is allowed to use it, 737 * it is assumed that the caller knows what he's doing. 738 */ 739 int * 740 yppasswdproc_update_master_1_svc(master_yppasswd *argp, 741 struct svc_req *rqstp) 742 { 743 static int result; 744 int pfd, tfd; 745 int pid; 746 uid_t uid; 747 int rval = 0; 748 DBT key, data; 749 char *passdir; 750 char *passfile_hold; 751 char passdir_buf[MAXPATHLEN + 2]; 752 char passfile_buf[MAXPATHLEN + 2]; 753 char passfile_hold_buf[MAXPATHLEN + 2]; 754 struct sockaddr_in *rqhost; 755 SVCXPRT *transp; 756 struct passwd newpasswd; 757 758 result = 1; 759 transp = rqstp->rq_xprt; 760 761 /* 762 * NO AF_INET CONNETCIONS ALLOWED! 763 */ 764 rqhost = svc_getcaller(transp); 765 if (rqhost->sin_family != AF_UNIX) { 766 yp_error("Alert! %s/%d attempted to use superuser-only \ 767 procedure!\n", inet_ntoa(rqhost->sin_addr), rqhost->sin_port); 768 svcerr_auth(transp, AUTH_BADCRED); 769 return(&result); 770 } 771 772 if (rqstp->rq_cred.oa_flavor != AUTH_SYS) { 773 yp_error("caller didn't send proper credentials"); 774 svcerr_auth(transp, AUTH_BADCRED); 775 return(&result); 776 } 777 778 if (__rpc_get_local_uid(transp, &uid) < 0) { 779 yp_error("caller didn't send proper credentials"); 780 svcerr_auth(transp, AUTH_BADCRED); 781 return(&result); 782 } 783 784 if (uid) { 785 yp_error("caller euid is %d, expecting 0 -- rejecting request", 786 uid); 787 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 788 return(&result); 789 } 790 791 passfile = passfile_default; 792 793 key.data = argp->newpw.pw_name; 794 key.size = strlen(argp->newpw.pw_name); 795 796 /* 797 * The superuser may add entries to the passwd maps if 798 * rpc.yppasswdd is started with the -a flag. Paranoia 799 * prevents me from allowing additions by default. 800 */ 801 if ((rval = yp_get_record(argp->domain, "master.passwd.byname", 802 &key, &data, 0)) != YP_TRUE) { 803 if (rval == YP_NOKEY) { 804 yp_error("user %s not found in passwd database", 805 argp->newpw.pw_name); 806 if (allow_additions) 807 yp_error("notice: adding user %s to \ 808 master.passwd database for domain %s", argp->newpw.pw_name, argp->domain); 809 else 810 yp_error("restart rpc.yppasswdd with the -a flag to \ 811 allow additions to be made to the password database"); 812 } else { 813 yp_error("database access error: %s", 814 yperr_string(rval)); 815 } 816 if (!allow_additions) 817 return(&result); 818 } else { 819 820 /* Nul terminate, please. */ 821 *((char *)data.data + data.size) = '\0'; 822 823 copy_yp_pass(data.data, 1, data.size); 824 } 825 826 /* 827 * Perform a small bit of sanity checking. 828 */ 829 if (validate_master(rval == YP_TRUE ? &yp_password:NULL,&argp->newpw)){ 830 yp_error("rejecting update attempt for %s: bad arguments", 831 argp->newpw.pw_name); 832 return(&result); 833 } 834 835 /* 836 * If the caller specified a domain other than our 'default' 837 * domain, change the path to master.passwd accordingly. 838 */ 839 840 if (strcmp(argp->domain, yppasswd_domain)) { 841 snprintf(passfile_buf, sizeof(passfile_buf), 842 "%s/%s/master.passwd", yp_dir, argp->domain); 843 passfile = (char *)&passfile_buf; 844 } 845 846 /* 847 * Create a filename to hold the original master.passwd 848 * so if our call to yppwupdate fails we can roll back 849 */ 850 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf), 851 "%s.hold", passfile); 852 passfile_hold = (char *)&passfile_hold_buf; 853 854 snprintf(passdir_buf, sizeof(passdir_buf), "%s", passfile); 855 passdir = dirname(passdir_buf); 856 857 if (pw_init(passdir, passfile)) { 858 yp_error("pw_init() failed"); 859 return &result; 860 } 861 if ((pfd = pw_lock()) == -1) { 862 pw_fini(); 863 yp_error("pw_lock() failed"); 864 return &result; 865 } 866 if ((tfd = pw_tmp(-1)) == -1) { 867 pw_fini(); 868 yp_error("pw_tmp() failed"); 869 return &result; 870 } 871 xlate_passwd(&argp->newpw, &newpasswd); 872 if (pw_copy(pfd, tfd, &newpasswd, NULL) == -1) { 873 pw_fini(); 874 yp_error("pw_copy() failed"); 875 return &result; 876 } 877 if (rename(passfile, passfile_hold) == -1) { 878 pw_fini(); 879 yp_error("rename of %s to %s failed", passfile, 880 passfile_hold); 881 return &result; 882 } 883 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) { 884 /* 885 * NIS server is exporting the system's master.passwd. 886 * Call pw_mkdb to rebuild passwd and the .db files 887 */ 888 if (pw_mkdb(argp->newpw.pw_name) == -1) { 889 pw_fini(); 890 yp_error("pw_mkdb() failed"); 891 rename(passfile_hold, passfile); 892 return &result; 893 } 894 } else { 895 /* 896 * NIS server is exporting a private master.passwd. 897 * Rename tempfile into final location 898 */ 899 if (rename(pw_tempname(), passfile) == -1) { 900 pw_fini(); 901 yp_error("rename of %s to %s failed", 902 pw_tempname(), passfile); 903 rename(passfile_hold, passfile); 904 return &result; 905 } 906 } 907 pw_fini(); 908 909 if (inplace) { 910 xlate_passwd(&argp->newpw, &newpasswd); 911 if ((rval = update_inplace(&newpasswd, argp->domain))) { 912 yp_error("inplace update failed -- rebuilding maps"); 913 } 914 } 915 916 switch ((pid = fork())) { 917 case 0: 918 if (inplace && !rval) { 919 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 920 argp->domain, "pushpw", (char *)NULL); 921 } else { 922 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 923 argp->domain, (char *)NULL); 924 } 925 yp_error("couldn't exec map update process: %s", 926 strerror(errno)); 927 unlink(passfile); 928 rename(passfile_hold, passfile); 929 exit(1); 930 break; 931 case -1: 932 yp_error("fork() failed: %s", strerror(errno)); 933 unlink(passfile); 934 rename(passfile_hold, passfile); 935 return(&result); 936 break; 937 default: 938 unlink(passfile_hold); 939 break; 940 } 941 942 yp_error("performed update of user %s (uid %d) domain %s", 943 argp->newpw.pw_name, 944 argp->newpw.pw_uid, 945 argp->domain); 946 947 result = 0; 948 return(&result); 949 } 950