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