1 /* 2 * Copyright (c) 1995, 1996 3 * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Bill Paul. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/param.h> 37 #include <sys/fcntl.h> 38 #include <sys/socket.h> 39 #include <sys/stat.h> 40 #include <sys/wait.h> 41 42 #include <arpa/inet.h> 43 #include <netinet/in.h> 44 45 #include <ctype.h> 46 #include <db.h> 47 #include <dirent.h> 48 #include <errno.h> 49 #include <limits.h> 50 #include <pwd.h> 51 #include <signal.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 57 #include <libgen.h> 58 #include <libutil.h> 59 60 #include <rpc/rpc.h> 61 #include <rpcsvc/yp.h> 62 struct dom_binding; 63 #include <rpcsvc/ypclnt.h> 64 #include "yppasswdd_extern.h" 65 #include "yppasswd.h" 66 #include "yppasswd_private.h" 67 #include "ypxfr_extern.h" 68 #include "yp_extern.h" 69 70 static struct passwd yp_password; 71 72 static void 73 xlate_passwd(struct x_master_passwd *xpwd, struct passwd *pwd) 74 { 75 pwd->pw_name = xpwd->pw_name; 76 pwd->pw_passwd = xpwd->pw_passwd; 77 pwd->pw_uid = xpwd->pw_uid; 78 pwd->pw_gid = xpwd->pw_gid; 79 pwd->pw_change = xpwd->pw_change; 80 pwd->pw_class = xpwd->pw_class; 81 pwd->pw_gecos = xpwd->pw_gecos; 82 pwd->pw_dir = xpwd->pw_dir; 83 pwd->pw_shell = xpwd->pw_shell; 84 pwd->pw_expire = xpwd->pw_expire; 85 pwd->pw_fields = xpwd->pw_fields; 86 } 87 88 static void 89 copy_yp_pass(char *p, int x, int m) 90 { 91 char *t, *s = p; 92 static char *buf; 93 94 yp_password.pw_fields = 0; 95 96 buf = realloc(buf, m + 10); 97 bzero(buf, m + 10); 98 99 /* Turn all colons into NULLs */ 100 while (strchr(s, ':')) { 101 s = (strchr(s, ':') + 1); 102 *(s - 1)= '\0'; 103 } 104 105 t = buf; 106 #define EXPAND(e) e = t; while ((*t++ = *p++)); 107 EXPAND(yp_password.pw_name); 108 yp_password.pw_fields |= _PWF_NAME; 109 EXPAND(yp_password.pw_passwd); 110 yp_password.pw_fields |= _PWF_PASSWD; 111 yp_password.pw_uid = atoi(p); 112 p += (strlen(p) + 1); 113 yp_password.pw_fields |= _PWF_UID; 114 yp_password.pw_gid = atoi(p); 115 p += (strlen(p) + 1); 116 yp_password.pw_fields |= _PWF_GID; 117 if (x) { 118 EXPAND(yp_password.pw_class); 119 yp_password.pw_fields |= _PWF_CLASS; 120 yp_password.pw_change = atol(p); 121 p += (strlen(p) + 1); 122 yp_password.pw_fields |= _PWF_CHANGE; 123 yp_password.pw_expire = atol(p); 124 p += (strlen(p) + 1); 125 yp_password.pw_fields |= _PWF_EXPIRE; 126 } 127 EXPAND(yp_password.pw_gecos); 128 yp_password.pw_fields |= _PWF_GECOS; 129 EXPAND(yp_password.pw_dir); 130 yp_password.pw_fields |= _PWF_DIR; 131 EXPAND(yp_password.pw_shell); 132 yp_password.pw_fields |= _PWF_SHELL; 133 134 return; 135 } 136 137 static int 138 validchars(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 } 159 160 static int 161 validate_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 } 185 186 static int 187 validate(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 (!ok_shell(npw->pw_shell)) { 216 yp_error("%s is not a valid shell", npw->pw_shell); 217 return(1); 218 } 219 220 if (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 */ 246 static char * 247 find_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 } 300 301 static const char *maps[] = { 302 "master.passwd.byname", 303 "master.passwd.byuid", 304 "passwd.byname", 305 "passwd.byuid" 306 }; 307 308 static 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 }; 314 315 static int 316 update_inplace(struct passwd *pw, char *domain) 317 { 318 DB *dbp = NULL; 319 DBT key = { NULL, 0 }; 320 DBT data = { NULL, 0 }; 321 char pwbuf[YPMAXRECORD]; 322 char keybuf[20]; 323 int i; 324 char *ptr = NULL; 325 static char yp_last[] = "YP_LAST_MODIFIED"; 326 char yplastbuf[YPMAXRECORD]; 327 328 snprintf(yplastbuf, sizeof yplastbuf, "%llu", 329 (unsigned long long)time(NULL)); 330 331 for (i = 0; i < 4; i++) { 332 333 if (i % 2) { 334 snprintf(keybuf, sizeof keybuf, 335 "%llu", (unsigned long long)pw->pw_uid); 336 key.data = &keybuf; 337 key.size = strlen(keybuf); 338 } else { 339 key.data = pw->pw_name; 340 key.size = strlen(pw->pw_name); 341 } 342 343 /* 344 * XXX The passwd.byname and passwd.byuid maps come in 345 * two flavors: secure and insecure. The secure version 346 * has a '*' in the password field whereas the insecure one 347 * has a real crypted password. The maps will be insecure 348 * if they were built with 'unsecure = TRUE' enabled in 349 * /var/yp/Makefile, but we'd have no way of knowing if 350 * this has been done unless we were to try parsing the 351 * Makefile, which is a disgusting thought. Instead, we 352 * read the records from the maps, skip to the first ':' 353 * in them, and then look at the character immediately 354 * following it. If it's an '*' then the map is 'secure' 355 * and we must not insert a real password into the pw_passwd 356 * field. If it's not an '*', then we put the real crypted 357 * password in. 358 */ 359 if (yp_get_record(domain,maps[i],&key,&data,1) != YP_TRUE) { 360 yp_error("couldn't read %s/%s: %s", domain, 361 maps[i], strerror(errno)); 362 return(1); 363 } 364 365 if ((ptr = strchr(data.data, ':')) == NULL) { 366 yp_error("no colon in passwd record?!"); 367 return(1); 368 } 369 370 /* 371 * XXX Supposing we have more than one user with the same 372 * UID? (Or more than one user with the same name?) We could 373 * end up modifying the wrong record if were not careful. 374 */ 375 if (i % 2) { 376 if (strncmp(data.data, pw->pw_name, 377 strlen(pw->pw_name))) { 378 yp_error("warning: found entry for UID %d \ 379 in map %s@%s with wrong name (%.*s)", pw->pw_uid, maps[i], domain, 380 (int)(ptr - (char *)data.data), 381 (char *)data.data); 382 yp_error("there may be more than one user \ 383 with the same UID - continuing"); 384 continue; 385 } 386 } else { 387 /* 388 * We're really being ultra-paranoid here. 389 * This is generally a 'can't happen' condition. 390 */ 391 snprintf(pwbuf, sizeof pwbuf, ":%d:%d:", pw->pw_uid, 392 pw->pw_gid); 393 if (!strstr(data.data, pwbuf)) { 394 yp_error("warning: found entry for user %s \ 395 in map %s@%s with wrong UID", pw->pw_name, maps[i], domain); 396 yp_error("there may be more than one user \ 397 with the same name - continuing"); 398 continue; 399 } 400 } 401 402 if (i < 2) { 403 snprintf(pwbuf, sizeof pwbuf, formats[i], 404 pw->pw_name, pw->pw_passwd, pw->pw_uid, 405 pw->pw_gid, pw->pw_class, pw->pw_change, 406 pw->pw_expire, pw->pw_gecos, pw->pw_dir, 407 pw->pw_shell); 408 } else { 409 snprintf(pwbuf, sizeof pwbuf, formats[i], 410 pw->pw_name, *(ptr+1) == '*' ? "*" : pw->pw_passwd, 411 pw->pw_uid, pw->pw_gid, pw->pw_gecos, pw->pw_dir, 412 pw->pw_shell); 413 } 414 415 #define FLAGS O_RDWR|O_CREAT 416 417 if ((dbp = yp_open_db_rw(domain, maps[i], FLAGS)) == NULL) { 418 yp_error("couldn't open %s/%s r/w: %s",domain, 419 maps[i],strerror(errno)); 420 return(1); 421 } 422 423 data.data = pwbuf; 424 data.size = strlen(pwbuf); 425 426 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) { 427 yp_error("failed to update record in %s/%s", domain, 428 maps[i]); 429 (void)(dbp->close)(dbp); 430 return(1); 431 } 432 433 key.data = yp_last; 434 key.size = strlen(yp_last); 435 data.data = (char *)&yplastbuf; 436 data.size = strlen(yplastbuf); 437 438 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) { 439 yp_error("failed to update timestamp in %s/%s", domain, 440 maps[i]); 441 (void)(dbp->close)(dbp); 442 return(1); 443 } 444 445 (void)(dbp->close)(dbp); 446 } 447 448 return(0); 449 } 450 451 int * 452 yppasswdproc_update_1_svc(yppasswd *argp, struct svc_req *rqstp) 453 { 454 static int result; 455 struct sockaddr_in *rqhost; 456 DBT key, data; 457 int rval = 0; 458 int pfd, tfd; 459 int pid; 460 int passwd_changed = 0; 461 int shell_changed = 0; 462 int gecos_changed = 0; 463 char *oldshell = NULL; 464 char *oldgecos = NULL; 465 char *passfile_hold; 466 char passfile_buf[MAXPATHLEN + 2]; 467 char passfile_hold_buf[MAXPATHLEN + 2]; 468 char *domain = yppasswd_domain; 469 static struct sockaddr_in clntaddr; 470 static struct timeval t_saved, t_test; 471 472 /* 473 * Normal user updates always use the 'default' master.passwd file. 474 */ 475 476 passfile = passfile_default; 477 result = 1; 478 479 rqhost = svc_getcaller(rqstp->rq_xprt); 480 481 gettimeofday(&t_test, NULL); 482 if (!bcmp(rqhost, &clntaddr, sizeof *rqhost) && 483 t_test.tv_sec > t_saved.tv_sec && 484 t_test.tv_sec - t_saved.tv_sec < 300) { 485 486 bzero(&clntaddr, sizeof clntaddr); 487 bzero(&t_saved, sizeof t_saved); 488 return(NULL); 489 } 490 491 bcopy(rqhost, &clntaddr, sizeof clntaddr); 492 gettimeofday(&t_saved, NULL); 493 494 if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) { 495 yp_error("rejected update request from unauthorized host"); 496 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 497 return(&result); 498 } 499 500 /* 501 * Step one: find the user. (It's kinda pointless to 502 * proceed if the user doesn't exist.) We look for the 503 * user in the master.passwd.byname database, _NOT_ by 504 * using getpwent() and friends! We can't use getpwent() 505 * since the NIS master server is not guaranteed to be 506 * configured as an NIS client. 507 */ 508 509 if (multidomain) { 510 if ((domain = find_domain(&argp->newpw)) == NULL) { 511 yp_error("multidomain lookup failed - aborting update"); 512 return(&result); 513 } else 514 yp_error("updating user %s in domain %s", 515 argp->newpw.pw_name, domain); 516 } 517 518 key.data = argp->newpw.pw_name; 519 key.size = strlen(argp->newpw.pw_name); 520 521 if ((rval = yp_get_record(domain,"master.passwd.byname", 522 &key, &data, 0)) != YP_TRUE) { 523 if (rval == YP_NOKEY) { 524 yp_error("user %s not found in passwd database", 525 argp->newpw.pw_name); 526 } else { 527 yp_error("database access error: %s", 528 yperr_string(rval)); 529 } 530 return(&result); 531 } 532 533 /* Nul terminate, please. */ 534 *((char *)data.data + data.size) = '\0'; 535 536 copy_yp_pass(data.data, 1, data.size); 537 538 /* Step 2: check that the supplied oldpass is valid. */ 539 540 if (strcmp(crypt(argp->oldpass, yp_password.pw_passwd), 541 yp_password.pw_passwd)) { 542 yp_error("rejected change attempt -- bad password"); 543 yp_error("client address: %s username: %s", 544 inet_ntoa(rqhost->sin_addr), 545 argp->newpw.pw_name); 546 return(&result); 547 } 548 549 /* Step 3: validate the arguments passed to us by the client. */ 550 551 if (validate(&yp_password, &argp->newpw)) { 552 yp_error("rejecting change attempt: bad arguments"); 553 yp_error("client address: %s username: %s", 554 inet_ntoa(rqhost->sin_addr), 555 argp->newpw.pw_name); 556 svcerr_decode(rqstp->rq_xprt); 557 return(&result); 558 } 559 560 /* Step 4: update the user's passwd structure. */ 561 562 if (!no_chsh && strcmp(argp->newpw.pw_shell, yp_password.pw_shell)) { 563 oldshell = yp_password.pw_shell; 564 yp_password.pw_shell = argp->newpw.pw_shell; 565 shell_changed++; 566 } 567 568 569 if (!no_chfn && strcmp(argp->newpw.pw_gecos, yp_password.pw_gecos)) { 570 oldgecos = yp_password.pw_gecos; 571 yp_password.pw_gecos = argp->newpw.pw_gecos; 572 gecos_changed++; 573 } 574 575 if (strcmp(argp->newpw.pw_passwd, yp_password.pw_passwd)) { 576 yp_password.pw_passwd = argp->newpw.pw_passwd; 577 yp_password.pw_change = 0; 578 passwd_changed++; 579 } 580 581 /* 582 * If the caller specified a domain other than our 'default' 583 * domain, change the path to master.passwd accordingly. 584 */ 585 586 if (strcmp(domain, yppasswd_domain)) { 587 snprintf(passfile_buf, sizeof(passfile_buf), 588 "%s/%s/master.passwd", yp_dir, domain); 589 passfile = (char *)&passfile_buf; 590 } 591 592 /* 593 * Create a filename to hold the original master.passwd 594 * so if our call to yppwupdate fails we can roll back 595 */ 596 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf), 597 "%s.hold", passfile); 598 passfile_hold = (char *)&passfile_hold_buf; 599 600 601 /* Step 5: make a new password file with the updated info. */ 602 603 if (pw_init(dirname(passfile), passfile)) { 604 yp_error("pw_init() failed"); 605 return &result; 606 } 607 if ((pfd = pw_lock()) == -1) { 608 pw_fini(); 609 yp_error("pw_lock() failed"); 610 return &result; 611 } 612 if ((tfd = pw_tmp(-1)) == -1) { 613 pw_fini(); 614 yp_error("pw_tmp() failed"); 615 return &result; 616 } 617 if (pw_copy(pfd, tfd, &yp_password, NULL) == -1) { 618 pw_fini(); 619 yp_error("pw_copy() failed"); 620 return &result; 621 } 622 if (rename(passfile, passfile_hold) == -1) { 623 pw_fini(); 624 yp_error("rename of %s to %s failed", passfile, 625 passfile_hold); 626 return &result; 627 } 628 629 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) { 630 /* 631 * NIS server is exporting the system's master.passwd. 632 * Call pw_mkdb to rebuild passwd and the .db files 633 */ 634 if (pw_mkdb(yp_password.pw_name) == -1) { 635 pw_fini(); 636 yp_error("pw_mkdb() failed"); 637 rename(passfile_hold, passfile); 638 return &result; 639 } 640 } else { 641 /* 642 * NIS server is exporting a private master.passwd. 643 * Rename tempfile into final location 644 */ 645 if (rename(pw_tempname(), passfile) == -1) { 646 pw_fini(); 647 yp_error("rename of %s to %s failed", 648 pw_tempname(), passfile); 649 rename(passfile_hold, passfile); 650 return &result; 651 } 652 } 653 654 pw_fini(); 655 656 if (inplace) { 657 if ((rval = update_inplace(&yp_password, domain))) { 658 yp_error("inplace update failed -- rebuilding maps"); 659 } 660 } 661 662 switch ((pid = fork())) { 663 case 0: 664 if (inplace && !rval) { 665 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 666 yppasswd_domain, "pushpw", (char *)NULL); 667 } else { 668 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 669 yppasswd_domain, (char *)NULL); 670 } 671 yp_error("couldn't exec map update process: %s", 672 strerror(errno)); 673 unlink(passfile); 674 rename(passfile_hold, passfile); 675 exit(1); 676 break; 677 case -1: 678 yp_error("fork() failed: %s", strerror(errno)); 679 unlink(passfile); 680 rename(passfile_hold, passfile); 681 return(&result); 682 break; 683 default: 684 unlink(passfile_hold); 685 break; 686 } 687 688 if (verbose) { 689 yp_error("update completed for user %s (uid %d) in %s:", 690 argp->newpw.pw_name, argp->newpw.pw_uid, passfile); 691 692 if (passwd_changed) 693 yp_error("password changed"); 694 695 if (gecos_changed) 696 yp_error("gecos changed ('%s' -> '%s')", 697 oldgecos, argp->newpw.pw_gecos); 698 699 if (shell_changed) 700 yp_error("shell changed ('%s' -> '%s')", 701 oldshell, argp->newpw.pw_shell); 702 } 703 704 result = 0; 705 return (&result); 706 } 707 708 /* 709 * Note that this function performs a little less sanity checking 710 * than the last one. Since only the superuser is allowed to use it, 711 * it is assumed that the caller knows what he's doing. 712 */ 713 int * 714 yppasswdproc_update_master_1_svc(master_yppasswd *argp, 715 struct svc_req *rqstp) 716 { 717 static int result; 718 int pfd, tfd; 719 int pid; 720 uid_t uid; 721 int rval = 0; 722 DBT key, data; 723 char *passfile_hold; 724 char passfile_buf[MAXPATHLEN + 2]; 725 char passfile_hold_buf[MAXPATHLEN + 2]; 726 struct sockaddr_in *rqhost; 727 SVCXPRT *transp; 728 struct passwd newpasswd; 729 730 result = 1; 731 transp = rqstp->rq_xprt; 732 733 /* 734 * NO AF_INET CONNETCIONS ALLOWED! 735 */ 736 rqhost = svc_getcaller(transp); 737 if (rqhost->sin_family != AF_UNIX) { 738 yp_error("Alert! %s/%d attempted to use superuser-only \ 739 procedure!\n", inet_ntoa(rqhost->sin_addr), rqhost->sin_port); 740 svcerr_auth(transp, AUTH_BADCRED); 741 return(&result); 742 } 743 744 if (rqstp->rq_cred.oa_flavor != AUTH_SYS) { 745 yp_error("caller didn't send proper credentials"); 746 svcerr_auth(transp, AUTH_BADCRED); 747 return(&result); 748 } 749 750 if (__rpc_get_local_uid(transp, &uid) < 0) { 751 yp_error("caller didn't send proper credentials"); 752 svcerr_auth(transp, AUTH_BADCRED); 753 return(&result); 754 } 755 756 if (uid) { 757 yp_error("caller euid is %d, expecting 0 -- rejecting request", 758 uid); 759 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 760 return(&result); 761 } 762 763 passfile = passfile_default; 764 765 key.data = argp->newpw.pw_name; 766 key.size = strlen(argp->newpw.pw_name); 767 768 /* 769 * The superuser may add entries to the passwd maps if 770 * rpc.yppasswdd is started with the -a flag. Paranoia 771 * prevents me from allowing additions by default. 772 */ 773 if ((rval = yp_get_record(argp->domain, "master.passwd.byname", 774 &key, &data, 0)) != YP_TRUE) { 775 if (rval == YP_NOKEY) { 776 yp_error("user %s not found in passwd database", 777 argp->newpw.pw_name); 778 if (allow_additions) 779 yp_error("notice: adding user %s to \ 780 master.passwd database for domain %s", argp->newpw.pw_name, argp->domain); 781 else 782 yp_error("restart rpc.yppasswdd with the -a flag to \ 783 allow additions to be made to the password database"); 784 } else { 785 yp_error("database access error: %s", 786 yperr_string(rval)); 787 } 788 if (!allow_additions) 789 return(&result); 790 } else { 791 792 /* Nul terminate, please. */ 793 *((char *)data.data + data.size) = '\0'; 794 795 copy_yp_pass(data.data, 1, data.size); 796 } 797 798 /* 799 * Perform a small bit of sanity checking. 800 */ 801 if (validate_master(rval == YP_TRUE ? &yp_password:NULL,&argp->newpw)){ 802 yp_error("rejecting update attempt for %s: bad arguments", 803 argp->newpw.pw_name); 804 return(&result); 805 } 806 807 /* 808 * If the caller specified a domain other than our 'default' 809 * domain, change the path to master.passwd accordingly. 810 */ 811 812 if (strcmp(argp->domain, yppasswd_domain)) { 813 snprintf(passfile_buf, sizeof(passfile_buf), 814 "%s/%s/master.passwd", yp_dir, argp->domain); 815 passfile = (char *)&passfile_buf; 816 } 817 818 /* 819 * Create a filename to hold the original master.passwd 820 * so if our call to yppwupdate fails we can roll back 821 */ 822 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf), 823 "%s.hold", passfile); 824 passfile_hold = (char *)&passfile_hold_buf; 825 826 if (pw_init(dirname(passfile), passfile)) { 827 yp_error("pw_init() failed"); 828 return &result; 829 } 830 if ((pfd = pw_lock()) == -1) { 831 pw_fini(); 832 yp_error("pw_lock() failed"); 833 return &result; 834 } 835 if ((tfd = pw_tmp(-1)) == -1) { 836 pw_fini(); 837 yp_error("pw_tmp() failed"); 838 return &result; 839 } 840 xlate_passwd(&argp->newpw, &newpasswd); 841 if (pw_copy(pfd, tfd, &newpasswd, NULL) == -1) { 842 pw_fini(); 843 yp_error("pw_copy() failed"); 844 return &result; 845 } 846 if (rename(passfile, passfile_hold) == -1) { 847 pw_fini(); 848 yp_error("rename of %s to %s failed", passfile, 849 passfile_hold); 850 return &result; 851 } 852 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) { 853 /* 854 * NIS server is exporting the system's master.passwd. 855 * Call pw_mkdb to rebuild passwd and the .db files 856 */ 857 if (pw_mkdb(argp->newpw.pw_name) == -1) { 858 pw_fini(); 859 yp_error("pw_mkdb() failed"); 860 rename(passfile_hold, passfile); 861 return &result; 862 } 863 } else { 864 /* 865 * NIS server is exporting a private master.passwd. 866 * Rename tempfile into final location 867 */ 868 if (rename(pw_tempname(), passfile) == -1) { 869 pw_fini(); 870 yp_error("rename of %s to %s failed", 871 pw_tempname(), passfile); 872 rename(passfile_hold, passfile); 873 return &result; 874 } 875 } 876 pw_fini(); 877 878 if (inplace) { 879 xlate_passwd(&argp->newpw, &newpasswd); 880 if ((rval = update_inplace(&newpasswd, argp->domain))) { 881 yp_error("inplace update failed -- rebuilding maps"); 882 } 883 } 884 885 switch ((pid = fork())) { 886 case 0: 887 if (inplace && !rval) { 888 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 889 argp->domain, "pushpw", (char *)NULL); 890 } else { 891 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 892 argp->domain, (char *)NULL); 893 } 894 yp_error("couldn't exec map update process: %s", 895 strerror(errno)); 896 unlink(passfile); 897 rename(passfile_hold, passfile); 898 exit(1); 899 break; 900 case -1: 901 yp_error("fork() failed: %s", strerror(errno)); 902 unlink(passfile); 903 rename(passfile_hold, passfile); 904 return(&result); 905 break; 906 default: 907 unlink(passfile_hold); 908 break; 909 } 910 911 yp_error("performed update of user %s (uid %d) domain %s", 912 argp->newpw.pw_name, 913 argp->newpw.pw_uid, 914 argp->domain); 915 916 result = 0; 917 return(&result); 918 } 919