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 * $FreeBSD: src/usr.sbin/rpc.yppasswdd/yppasswdd_server.c,v 1.29 2003/06/15 21:24:45 mbr Exp $ 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> 61 struct 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 69 static struct passwd yp_password; 70 71 static void 72 copy_yp_pass(char *p, int x, int m) 73 { 74 char *t, *s = p; 75 static char *buf; 76 77 yp_password.pw_fields = 0; 78 79 buf = realloc(buf, m + 10); 80 bzero(buf, m + 10); 81 82 /* Turn all colons into NULLs */ 83 while (strchr(s, ':')) { 84 s = (strchr(s, ':') + 1); 85 *(s - 1)= '\0'; 86 } 87 88 t = buf; 89 #define EXPAND(e) e = t; while ((*t++ = *p++)); 90 EXPAND(yp_password.pw_name); 91 yp_password.pw_fields |= _PWF_NAME; 92 EXPAND(yp_password.pw_passwd); 93 yp_password.pw_fields |= _PWF_PASSWD; 94 yp_password.pw_uid = atoi(p); 95 p += (strlen(p) + 1); 96 yp_password.pw_fields |= _PWF_UID; 97 yp_password.pw_gid = atoi(p); 98 p += (strlen(p) + 1); 99 yp_password.pw_fields |= _PWF_GID; 100 if (x) { 101 EXPAND(yp_password.pw_class); 102 yp_password.pw_fields |= _PWF_CLASS; 103 yp_password.pw_change = atol(p); 104 p += (strlen(p) + 1); 105 yp_password.pw_fields |= _PWF_CHANGE; 106 yp_password.pw_expire = atol(p); 107 p += (strlen(p) + 1); 108 yp_password.pw_fields |= _PWF_EXPIRE; 109 } 110 EXPAND(yp_password.pw_gecos); 111 yp_password.pw_fields |= _PWF_GECOS; 112 EXPAND(yp_password.pw_dir); 113 yp_password.pw_fields |= _PWF_DIR; 114 EXPAND(yp_password.pw_shell); 115 yp_password.pw_fields |= _PWF_SHELL; 116 117 return; 118 } 119 120 static int 121 validchars(char *arg) 122 { 123 size_t i; 124 125 for (i = 0; i < strlen(arg); i++) { 126 if (iscntrl(arg[i])) { 127 yp_error("string contains a control character"); 128 return(1); 129 } 130 if (arg[i] == ':') { 131 yp_error("string contains a colon"); 132 return(1); 133 } 134 /* Be evil: truncate strings with \n in them silently. */ 135 if (arg[i] == '\n') { 136 arg[i] = '\0'; 137 return(0); 138 } 139 } 140 return(0); 141 } 142 143 static int 144 validate_master(struct passwd *opw __unused, struct x_master_passwd *npw) 145 { 146 147 if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') { 148 yp_error("client tried to modify an NIS entry"); 149 return(1); 150 } 151 152 if (validchars(npw->pw_shell)) { 153 yp_error("specified shell contains invalid characters"); 154 return(1); 155 } 156 157 if (validchars(npw->pw_gecos)) { 158 yp_error("specified gecos field contains invalid characters"); 159 return(1); 160 } 161 162 if (validchars(npw->pw_passwd)) { 163 yp_error("specified password contains invalid characters"); 164 return(1); 165 } 166 return(0); 167 } 168 169 static int 170 validate(struct passwd *opw, struct x_passwd *npw) 171 { 172 173 if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') { 174 yp_error("client tried to modify an NIS entry"); 175 return(1); 176 } 177 178 if ((uid_t)npw->pw_uid != opw->pw_uid) { 179 yp_error("UID mismatch: client says user %s has UID %d", 180 npw->pw_name, npw->pw_uid); 181 yp_error("database says user %s has UID %d", opw->pw_name, 182 opw->pw_uid); 183 return(1); 184 } 185 186 if ((gid_t)npw->pw_gid != opw->pw_gid) { 187 yp_error("GID mismatch: client says user %s has GID %d", 188 npw->pw_name, npw->pw_gid); 189 yp_error("database says user %s has GID %d", opw->pw_name, 190 opw->pw_gid); 191 return(1); 192 } 193 194 /* 195 * Don't allow the user to shoot himself in the foot, 196 * even on purpose. 197 */ 198 if (!ok_shell(npw->pw_shell)) { 199 yp_error("%s is not a valid shell", npw->pw_shell); 200 return(1); 201 } 202 203 if (validchars(npw->pw_shell)) { 204 yp_error("specified shell contains invalid characters"); 205 return(1); 206 } 207 208 if (validchars(npw->pw_gecos)) { 209 yp_error("specified gecos field contains invalid characters"); 210 return(1); 211 } 212 213 if (validchars(npw->pw_passwd)) { 214 yp_error("specified password contains invalid characters"); 215 return(1); 216 } 217 return(0); 218 } 219 220 /* 221 * Kludge alert: 222 * In order to have one rpc.yppasswdd support multiple domains, 223 * we have to cheat: we search each directory under /var/yp 224 * and try to match the user in each master.passwd.byname 225 * map that we find. If the user matches (username, uid and gid 226 * all agree), then we use that domain. If we match the user in 227 * more than one database, we must abort. 228 */ 229 static char * 230 find_domain(struct x_passwd *pw) 231 { 232 struct stat statbuf; 233 struct dirent *dirp; 234 DIR *dird; 235 char yp_mapdir[MAXPATHLEN + 2]; 236 static char domain[YPMAXDOMAIN]; 237 char *tmp = NULL; 238 DBT key, data; 239 int hit = 0; 240 241 yp_error("performing multidomain lookup"); 242 243 if ((dird = opendir(yp_dir)) == NULL) { 244 yp_error("opendir(%s) failed: %s", yp_dir, strerror(errno)); 245 return(NULL); 246 } 247 248 while ((dirp = readdir(dird)) != NULL) { 249 snprintf(yp_mapdir, sizeof yp_mapdir, "%s/%s", 250 yp_dir, dirp->d_name); 251 if (stat(yp_mapdir, &statbuf) < 0) { 252 yp_error("stat(%s) failed: %s", yp_mapdir, 253 strerror(errno)); 254 closedir(dird); 255 return(NULL); 256 } 257 if (S_ISDIR(statbuf.st_mode)) { 258 tmp = (char *)dirp->d_name; 259 key.data = pw->pw_name; 260 key.size = strlen(pw->pw_name); 261 262 if (yp_get_record(tmp,"master.passwd.byname", 263 &key, &data, 0) != YP_TRUE) { 264 continue; 265 } 266 *((char *)data.data + data.size) = '\0'; 267 copy_yp_pass(data.data, 1, data.size); 268 if (yp_password.pw_uid == (uid_t)pw->pw_uid && 269 yp_password.pw_gid == (gid_t)pw->pw_gid) { 270 hit++; 271 snprintf(domain, YPMAXDOMAIN, "%s", tmp); 272 } 273 } 274 } 275 276 closedir(dird); 277 if (hit > 1) { 278 yp_error("found same user in two different domains"); 279 return(NULL); 280 } else 281 return((char *)&domain); 282 } 283 284 static const char *maps[] = { 285 "master.passwd.byname", 286 "master.passwd.byuid", 287 "passwd.byname", 288 "passwd.byuid" 289 }; 290 291 static const char *formats[] = { 292 "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s", 293 "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s", 294 "%s:%s:%d:%d:%s:%s:%s", 295 "%s:%s:%d:%d:%s:%s:%s" 296 }; 297 298 static int 299 update_inplace(struct passwd *pw, char *domain) 300 { 301 DB *dbp = NULL; 302 DBT key = { NULL, 0 }; 303 DBT data = { NULL, 0 }; 304 char pwbuf[YPMAXRECORD]; 305 char keybuf[20]; 306 int i; 307 char *ptr = NULL; 308 static char yp_last[] = "YP_LAST_MODIFIED"; 309 char yplastbuf[YPMAXRECORD]; 310 311 snprintf(yplastbuf, sizeof yplastbuf, "%llu", 312 (unsigned long long)time(NULL)); 313 314 for (i = 0; i < 4; i++) { 315 316 if (i % 2) { 317 snprintf(keybuf, sizeof keybuf, 318 "%llu", (unsigned long long)pw->pw_uid); 319 key.data = &keybuf; 320 key.size = strlen(keybuf); 321 } else { 322 key.data = pw->pw_name; 323 key.size = strlen(pw->pw_name); 324 } 325 326 /* 327 * XXX The passwd.byname and passwd.byuid maps come in 328 * two flavors: secure and insecure. The secure version 329 * has a '*' in the password field whereas the insecure one 330 * has a real crypted password. The maps will be insecure 331 * if they were built with 'unsecure = TRUE' enabled in 332 * /var/yp/Makefile, but we'd have no way of knowing if 333 * this has been done unless we were to try parsing the 334 * Makefile, which is a disgusting thought. Instead, we 335 * read the records from the maps, skip to the first ':' 336 * in them, and then look at the character immediately 337 * following it. If it's an '*' then the map is 'secure' 338 * and we must not insert a real password into the pw_passwd 339 * field. If it's not an '*', then we put the real crypted 340 * password in. 341 */ 342 if (yp_get_record(domain,maps[i],&key,&data,1) != YP_TRUE) { 343 yp_error("couldn't read %s/%s: %s", domain, 344 maps[i], strerror(errno)); 345 return(1); 346 } 347 348 if ((ptr = strchr(data.data, ':')) == NULL) { 349 yp_error("no colon in passwd record?!"); 350 return(1); 351 } 352 353 /* 354 * XXX Supposing we have more than one user with the same 355 * UID? (Or more than one user with the same name?) We could 356 * end up modifying the wrong record if were not careful. 357 */ 358 if (i % 2) { 359 if (strncmp(data.data, pw->pw_name, 360 strlen(pw->pw_name))) { 361 yp_error("warning: found entry for UID %d " 362 "in map %s@%s with wrong name (%.*s)", 363 pw->pw_uid, maps[i], domain, 364 (int)(ptr - (char *)data.data), 365 (char *)data.data); 366 yp_error("there may be more than one user " 367 "with the same UID - continuing"); 368 continue; 369 } 370 } else { 371 /* 372 * We're really being ultra-paranoid here. 373 * This is generally a 'can't happen' condition. 374 */ 375 snprintf(pwbuf, sizeof pwbuf, ":%d:%d:", pw->pw_uid, 376 pw->pw_gid); 377 if (!strstr(data.data, pwbuf)) { 378 yp_error("warning: found entry for user %s \ 379 in map %s@%s with wrong UID", pw->pw_name, maps[i], domain); 380 yp_error("there may be more than one user \ 381 with the same name - continuing"); 382 continue; 383 } 384 } 385 386 if (i < 2) { 387 snprintf(pwbuf, sizeof pwbuf, formats[i], 388 pw->pw_name, pw->pw_passwd, pw->pw_uid, 389 pw->pw_gid, pw->pw_class, pw->pw_change, 390 pw->pw_expire, pw->pw_gecos, pw->pw_dir, 391 pw->pw_shell); 392 } else { 393 snprintf(pwbuf, sizeof pwbuf, formats[i], 394 pw->pw_name, *(ptr+1) == '*' ? "*" : pw->pw_passwd, 395 pw->pw_uid, pw->pw_gid, pw->pw_gecos, pw->pw_dir, 396 pw->pw_shell); 397 } 398 399 #define FLAGS O_RDWR|O_CREAT 400 401 if ((dbp = yp_open_db_rw(domain, maps[i], FLAGS)) == NULL) { 402 yp_error("couldn't open %s/%s r/w: %s",domain, 403 maps[i],strerror(errno)); 404 return(1); 405 } 406 407 data.data = pwbuf; 408 data.size = strlen(pwbuf); 409 410 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) { 411 yp_error("failed to update record in %s/%s", domain, 412 maps[i]); 413 (dbp->close)(dbp); 414 return(1); 415 } 416 417 key.data = yp_last; 418 key.size = strlen(yp_last); 419 data.data = (char *)&yplastbuf; 420 data.size = strlen(yplastbuf); 421 422 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) { 423 yp_error("failed to update timestamp in %s/%s", domain, 424 maps[i]); 425 (dbp->close)(dbp); 426 return(1); 427 } 428 429 (dbp->close)(dbp); 430 } 431 432 return(0); 433 } 434 435 int * 436 yppasswdproc_update_1_svc(yppasswd *argp, struct svc_req *rqstp) 437 { 438 static int result; 439 struct sockaddr_in *rqhost; 440 DBT key, data; 441 int rval = 0; 442 int pfd, tfd; 443 int pid; 444 int passwd_changed = 0; 445 int shell_changed = 0; 446 int gecos_changed = 0; 447 char *oldshell = NULL; 448 char *oldgecos = NULL; 449 char *passfile_hold; 450 char passfile_buf[MAXPATHLEN + 2]; 451 char passfile_hold_buf[MAXPATHLEN + 2]; 452 char *domain = yppasswd_domain; 453 char *cryptpw; 454 static struct sockaddr_in clntaddr; 455 static struct timeval t_saved, t_test; 456 457 /* 458 * Normal user updates always use the 'default' master.passwd file. 459 */ 460 461 passfile = passfile_default; 462 result = 1; 463 464 rqhost = svc_getcaller(rqstp->rq_xprt); 465 466 gettimeofday(&t_test, NULL); 467 if (!bcmp(rqhost, &clntaddr, sizeof *rqhost) && 468 t_test.tv_sec > t_saved.tv_sec && 469 t_test.tv_sec - t_saved.tv_sec < 300) { 470 471 bzero(&clntaddr, sizeof clntaddr); 472 bzero(&t_saved, sizeof t_saved); 473 return(NULL); 474 } 475 476 bcopy(rqhost, &clntaddr, sizeof clntaddr); 477 gettimeofday(&t_saved, NULL); 478 479 if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) { 480 yp_error("rejected update request from unauthorized host"); 481 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 482 return(&result); 483 } 484 485 /* 486 * Step one: find the user. (It's kinda pointless to 487 * proceed if the user doesn't exist.) We look for the 488 * user in the master.passwd.byname database, _NOT_ by 489 * using getpwent() and friends! We can't use getpwent() 490 * since the NIS master server is not guaranteed to be 491 * configured as an NIS client. 492 */ 493 494 if (multidomain) { 495 if ((domain = find_domain(&argp->newpw)) == NULL) { 496 yp_error("multidomain lookup failed - aborting update"); 497 return(&result); 498 } else 499 yp_error("updating user %s in domain %s", 500 argp->newpw.pw_name, domain); 501 } 502 503 key.data = argp->newpw.pw_name; 504 key.size = strlen(argp->newpw.pw_name); 505 506 if ((rval = yp_get_record(domain,"master.passwd.byname", 507 &key, &data, 0)) != YP_TRUE) { 508 if (rval == YP_NOKEY) { 509 yp_error("user %s not found in passwd database", 510 argp->newpw.pw_name); 511 } else { 512 yp_error("database access error: %s", 513 yperr_string(rval)); 514 } 515 return(&result); 516 } 517 518 /* Nul terminate, please. */ 519 *((char *)data.data + data.size) = '\0'; 520 521 copy_yp_pass(data.data, 1, data.size); 522 523 /* Step 2: check that the supplied oldpass is valid. */ 524 525 cryptpw = crypt(argp->oldpass, yp_password.pw_passwd); 526 527 if (cryptpw == NULL || strcmp(cryptpw, yp_password.pw_passwd) != 0) { 528 yp_error("rejected change attempt -- bad password"); 529 yp_error("client address: %s username: %s", 530 inet_ntoa(rqhost->sin_addr), 531 argp->newpw.pw_name); 532 return(&result); 533 } 534 535 /* Step 3: validate the arguments passed to us by the client. */ 536 537 if (validate(&yp_password, &argp->newpw)) { 538 yp_error("rejecting change attempt: bad arguments"); 539 yp_error("client address: %s username: %s", 540 inet_ntoa(rqhost->sin_addr), 541 argp->newpw.pw_name); 542 svcerr_decode(rqstp->rq_xprt); 543 return(&result); 544 } 545 546 /* Step 4: update the user's passwd structure. */ 547 548 if (!no_chsh && strcmp(argp->newpw.pw_shell, yp_password.pw_shell)) { 549 oldshell = yp_password.pw_shell; 550 yp_password.pw_shell = argp->newpw.pw_shell; 551 shell_changed++; 552 } 553 554 555 if (!no_chfn && strcmp(argp->newpw.pw_gecos, yp_password.pw_gecos)) { 556 oldgecos = yp_password.pw_gecos; 557 yp_password.pw_gecos = argp->newpw.pw_gecos; 558 gecos_changed++; 559 } 560 561 if (strcmp(argp->newpw.pw_passwd, yp_password.pw_passwd)) { 562 yp_password.pw_passwd = argp->newpw.pw_passwd; 563 yp_password.pw_change = 0; 564 passwd_changed++; 565 } 566 567 /* 568 * If the caller specified a domain other than our 'default' 569 * domain, change the path to master.passwd accordingly. 570 */ 571 572 if (strcmp(domain, yppasswd_domain)) { 573 snprintf(passfile_buf, sizeof(passfile_buf), 574 "%s/%s/master.passwd", yp_dir, domain); 575 passfile = (char *)&passfile_buf; 576 } 577 578 /* 579 * Create a filename to hold the original master.passwd 580 * so if our call to yppwupdate fails we can roll back 581 */ 582 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf), 583 "%s.hold", passfile); 584 passfile_hold = (char *)&passfile_hold_buf; 585 586 587 /* Step 5: make a new password file with the updated info. */ 588 589 if (pw_init(dirname(passfile), passfile)) { 590 yp_error("pw_init() failed"); 591 return &result; 592 } 593 if ((pfd = pw_lock()) == -1) { 594 pw_fini(); 595 yp_error("pw_lock() failed"); 596 return &result; 597 } 598 if ((tfd = pw_tmp(-1)) == -1) { 599 pw_fini(); 600 yp_error("pw_tmp() failed"); 601 return &result; 602 } 603 if (pw_copy(pfd, tfd, &yp_password, NULL) == -1) { 604 pw_fini(); 605 yp_error("pw_copy() failed"); 606 return &result; 607 } 608 if (rename(passfile, passfile_hold) == -1) { 609 pw_fini(); 610 yp_error("rename of %s to %s failed", passfile, 611 passfile_hold); 612 return &result; 613 } 614 615 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) { 616 /* 617 * NIS server is exporting the system's master.passwd. 618 * Call pw_mkdb to rebuild passwd and the .db files 619 */ 620 if (pw_mkdb(yp_password.pw_name) == -1) { 621 pw_fini(); 622 yp_error("pw_mkdb() failed"); 623 rename(passfile_hold, passfile); 624 return &result; 625 } 626 } else { 627 /* 628 * NIS server is exporting a private master.passwd. 629 * Rename tempfile into final location 630 */ 631 if (rename(pw_tempname(), passfile) == -1) { 632 pw_fini(); 633 yp_error("rename of %s to %s failed", 634 pw_tempname(), passfile); 635 rename(passfile_hold, passfile); 636 return &result; 637 } 638 } 639 640 pw_fini(); 641 642 if (inplace) { 643 if ((rval = update_inplace(&yp_password, domain))) { 644 yp_error("inplace update failed -- rebuilding maps"); 645 } 646 } 647 648 switch ((pid = fork())) { 649 case 0: 650 if (inplace && !rval) { 651 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 652 yppasswd_domain, "pushpw", NULL); 653 } else { 654 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 655 yppasswd_domain, NULL); 656 } 657 yp_error("couldn't exec map update process: %s", 658 strerror(errno)); 659 unlink(passfile); 660 rename(passfile_hold, passfile); 661 exit(1); 662 break; 663 case -1: 664 yp_error("fork() failed: %s", strerror(errno)); 665 unlink(passfile); 666 rename(passfile_hold, passfile); 667 return(&result); 668 break; 669 default: 670 unlink(passfile_hold); 671 break; 672 } 673 674 if (verbose) { 675 yp_error("update completed for user %s (uid %d) in %s:", 676 argp->newpw.pw_name, argp->newpw.pw_uid, passfile); 677 678 if (passwd_changed) 679 yp_error("password changed"); 680 681 if (gecos_changed) 682 yp_error("gecos changed ('%s' -> '%s')", 683 oldgecos, argp->newpw.pw_gecos); 684 685 if (shell_changed) 686 yp_error("shell changed ('%s' -> '%s')", 687 oldshell, argp->newpw.pw_shell); 688 } 689 690 result = 0; 691 return (&result); 692 } 693 694 /* 695 * Note that this function performs a little less sanity checking 696 * than the last one. Since only the superuser is allowed to use it, 697 * it is assumed that the caller knows what he's doing. 698 */ 699 int * 700 yppasswdproc_update_master_1_svc(master_yppasswd *argp, struct svc_req *rqstp) 701 { 702 static int result; 703 int pfd, tfd; 704 int pid; 705 uid_t uid; 706 int rval = 0; 707 DBT key, data; 708 char *passfile_hold; 709 char passfile_buf[MAXPATHLEN + 2]; 710 char passfile_hold_buf[MAXPATHLEN + 2]; 711 struct sockaddr_in *rqhost; 712 SVCXPRT *transp; 713 714 result = 1; 715 transp = rqstp->rq_xprt; 716 717 /* 718 * NO AF_INET CONNETCIONS ALLOWED! 719 */ 720 rqhost = svc_getcaller(transp); 721 if (rqhost->sin_family != AF_UNIX) { 722 yp_error("Alert! %s/%d attempted to use superuser-only \ 723 procedure!\n", inet_ntoa(rqhost->sin_addr), rqhost->sin_port); 724 svcerr_auth(transp, AUTH_BADCRED); 725 return(&result); 726 } 727 728 if (rqstp->rq_cred.oa_flavor != AUTH_SYS) { 729 yp_error("caller didn't send proper credentials"); 730 svcerr_auth(transp, AUTH_BADCRED); 731 return(&result); 732 } 733 734 if (__rpc_get_local_uid(transp, &uid) < 0) { 735 yp_error("caller didn't send proper credentials"); 736 svcerr_auth(transp, AUTH_BADCRED); 737 return(&result); 738 } 739 740 if (uid) { 741 yp_error("caller euid is %d, expecting 0 -- rejecting request", 742 uid); 743 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 744 return(&result); 745 } 746 747 passfile = passfile_default; 748 749 key.data = argp->newpw.pw_name; 750 key.size = strlen(argp->newpw.pw_name); 751 752 /* 753 * The superuser may add entries to the passwd maps if 754 * rpc.yppasswdd is started with the -a flag. Paranoia 755 * prevents me from allowing additions by default. 756 */ 757 if ((rval = yp_get_record(argp->domain, "master.passwd.byname", 758 &key, &data, 0)) != YP_TRUE) { 759 if (rval == YP_NOKEY) { 760 yp_error("user %s not found in passwd database", 761 argp->newpw.pw_name); 762 if (allow_additions) 763 yp_error("notice: adding user %s to \ 764 master.passwd database for domain %s", argp->newpw.pw_name, argp->domain); 765 else 766 yp_error("restart rpc.yppasswdd with the -a flag to \ 767 allow additions to be made to the password database"); 768 } else { 769 yp_error("database access error: %s", 770 yperr_string(rval)); 771 } 772 if (!allow_additions) 773 return(&result); 774 } else { 775 776 /* Nul terminate, please. */ 777 *((char *)data.data + data.size) = '\0'; 778 779 copy_yp_pass(data.data, 1, data.size); 780 } 781 782 /* 783 * Perform a small bit of sanity checking. 784 */ 785 if (validate_master(rval == YP_TRUE ? &yp_password:NULL,&argp->newpw)){ 786 yp_error("rejecting update attempt for %s: bad arguments", 787 argp->newpw.pw_name); 788 return(&result); 789 } 790 791 /* 792 * If the caller specified a domain other than our 'default' 793 * domain, change the path to master.passwd accordingly. 794 */ 795 796 if (strcmp(argp->domain, yppasswd_domain)) { 797 snprintf(passfile_buf, sizeof(passfile_buf), 798 "%s/%s/master.passwd", yp_dir, argp->domain); 799 passfile = (char *)&passfile_buf; 800 } 801 802 /* 803 * Create a filename to hold the original master.passwd 804 * so if our call to yppwupdate fails we can roll back 805 */ 806 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf), 807 "%s.hold", passfile); 808 passfile_hold = (char *)&passfile_hold_buf; 809 810 if (pw_init(dirname(passfile), passfile)) { 811 yp_error("pw_init() failed"); 812 return &result; 813 } 814 if ((pfd = pw_lock()) == -1) { 815 pw_fini(); 816 yp_error("pw_lock() failed"); 817 return &result; 818 } 819 if ((tfd = pw_tmp(-1)) == -1) { 820 pw_fini(); 821 yp_error("pw_tmp() failed"); 822 return &result; 823 } 824 if (pw_copy(pfd, tfd, (struct passwd *)&argp->newpw, NULL) == -1) { 825 pw_fini(); 826 yp_error("pw_copy() failed"); 827 return &result; 828 } 829 if (rename(passfile, passfile_hold) == -1) { 830 pw_fini(); 831 yp_error("rename of %s to %s failed", passfile, 832 passfile_hold); 833 return &result; 834 } 835 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) { 836 /* 837 * NIS server is exporting the system's master.passwd. 838 * Call pw_mkdb to rebuild passwd and the .db files 839 */ 840 if (pw_mkdb(argp->newpw.pw_name) == -1) { 841 pw_fini(); 842 yp_error("pw_mkdb() failed"); 843 rename(passfile_hold, passfile); 844 return &result; 845 } 846 } else { 847 /* 848 * NIS server is exporting a private master.passwd. 849 * Rename tempfile into final location 850 */ 851 if (rename(pw_tempname(), passfile) == -1) { 852 pw_fini(); 853 yp_error("rename of %s to %s failed", 854 pw_tempname(), passfile); 855 rename(passfile_hold, passfile); 856 return &result; 857 } 858 } 859 pw_fini(); 860 861 if (inplace) { 862 if ((rval = update_inplace((struct passwd *)&argp->newpw, 863 argp->domain))) { 864 yp_error("inplace update failed -- rebuilding maps"); 865 } 866 } 867 868 switch ((pid = fork())) { 869 case 0: 870 if (inplace && !rval) { 871 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 872 argp->domain, "pushpw", NULL); 873 } else { 874 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 875 argp->domain, NULL); 876 } 877 yp_error("couldn't exec map update process: %s", 878 strerror(errno)); 879 unlink(passfile); 880 rename(passfile_hold, passfile); 881 exit(1); 882 break; 883 case -1: 884 yp_error("fork() failed: %s", strerror(errno)); 885 unlink(passfile); 886 rename(passfile_hold, passfile); 887 return(&result); 888 break; 889 default: 890 unlink(passfile_hold); 891 break; 892 } 893 894 yp_error("performed update of user %s (uid %d) domain %s", 895 argp->newpw.pw_name, 896 argp->newpw.pw_uid, 897 argp->domain); 898 899 result = 0; 900 return(&result); 901 } 902