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> 62struct 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 70static struct passwd yp_password; 71 72static void 73xlate_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 88static void 89copy_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 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 (!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 */ 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[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 \ 379in 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 \ 383with 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 \ 395in map %s@%s with wrong UID", pw->pw_name, maps[i], domain); 396 yp_error("there may be more than one user \ 397with 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 451int * 452yppasswdproc_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 *cryptpw; 464 char *oldshell = NULL; 465 char *oldgecos = NULL; 466 char *passfile_hold; 467 char passfile_buf[MAXPATHLEN + 2]; 468 char passfile_hold_buf[MAXPATHLEN + 2]; 469 char *domain = yppasswd_domain; 470 static struct sockaddr_in clntaddr; 471 static struct timeval t_saved, t_test; 472 473 /* 474 * Normal user updates always use the 'default' master.passwd file. 475 */ 476 477 passfile = passfile_default; 478 result = 1; 479 480 rqhost = svc_getcaller(rqstp->rq_xprt); 481 482 gettimeofday(&t_test, NULL); 483 if (!bcmp(rqhost, &clntaddr, sizeof *rqhost) && 484 t_test.tv_sec > t_saved.tv_sec && 485 t_test.tv_sec - t_saved.tv_sec < 300) { 486 487 bzero(&clntaddr, sizeof clntaddr); 488 bzero(&t_saved, sizeof t_saved); 489 return(NULL); 490 } 491 492 bcopy(rqhost, &clntaddr, sizeof clntaddr); 493 gettimeofday(&t_saved, NULL); 494 495 if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) { 496 yp_error("rejected update request from unauthorized host"); 497 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 498 return(&result); 499 } 500 501 /* 502 * Step one: find the user. (It's kinda pointless to 503 * proceed if the user doesn't exist.) We look for the 504 * user in the master.passwd.byname database, _NOT_ by 505 * using getpwent() and friends! We can't use getpwent() 506 * since the NIS master server is not guaranteed to be 507 * configured as an NIS client. 508 */ 509 510 if (multidomain) { 511 if ((domain = find_domain(&argp->newpw)) == NULL) { 512 yp_error("multidomain lookup failed - aborting update"); 513 return(&result); 514 } else 515 yp_error("updating user %s in domain %s", 516 argp->newpw.pw_name, domain); 517 } 518 519 key.data = argp->newpw.pw_name; 520 key.size = strlen(argp->newpw.pw_name); 521 522 if ((rval = yp_get_record(domain,"master.passwd.byname", 523 &key, &data, 0)) != YP_TRUE) { 524 if (rval == YP_NOKEY) { 525 yp_error("user %s not found in passwd database", 526 argp->newpw.pw_name); 527 } else { 528 yp_error("database access error: %s", 529 yperr_string(rval)); 530 } 531 return(&result); 532 } 533 534 /* Nul terminate, please. */ 535 *((char *)data.data + data.size) = '\0'; 536 537 copy_yp_pass(data.data, 1, data.size); 538 539 /* Step 2: check that the supplied oldpass is valid. */ 540 541 cryptpw = crypt(argp->oldpass, yp_password.pw_passwd); 542 if (cryptpw == NULL || strcmp(cryptpw, yp_password.pw_passwd)) { 543 yp_error("rejected change attempt -- bad password"); 544 yp_error("client address: %s username: %s", 545 inet_ntoa(rqhost->sin_addr), 546 argp->newpw.pw_name); 547 return(&result); 548 } 549 550 /* Step 3: validate the arguments passed to us by the client. */ 551 552 if (validate(&yp_password, &argp->newpw)) { 553 yp_error("rejecting change attempt: bad arguments"); 554 yp_error("client address: %s username: %s", 555 inet_ntoa(rqhost->sin_addr), 556 argp->newpw.pw_name); 557 svcerr_decode(rqstp->rq_xprt); 558 return(&result); 559 } 560 561 /* Step 4: update the user's passwd structure. */ 562 563 if (!no_chsh && strcmp(argp->newpw.pw_shell, yp_password.pw_shell)) { 564 oldshell = yp_password.pw_shell; 565 yp_password.pw_shell = argp->newpw.pw_shell; 566 shell_changed++; 567 } 568 569 570 if (!no_chfn && strcmp(argp->newpw.pw_gecos, yp_password.pw_gecos)) { 571 oldgecos = yp_password.pw_gecos; 572 yp_password.pw_gecos = argp->newpw.pw_gecos; 573 gecos_changed++; 574 } 575 576 if (strcmp(argp->newpw.pw_passwd, yp_password.pw_passwd)) { 577 yp_password.pw_passwd = argp->newpw.pw_passwd; 578 yp_password.pw_change = 0; 579 passwd_changed++; 580 } 581 582 /* 583 * If the caller specified a domain other than our 'default' 584 * domain, change the path to master.passwd accordingly. 585 */ 586 587 if (strcmp(domain, yppasswd_domain)) { 588 snprintf(passfile_buf, sizeof(passfile_buf), 589 "%s/%s/master.passwd", yp_dir, domain); 590 passfile = (char *)&passfile_buf; 591 } 592 593 /* 594 * Create a filename to hold the original master.passwd 595 * so if our call to yppwupdate fails we can roll back 596 */ 597 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf), 598 "%s.hold", passfile); 599 passfile_hold = (char *)&passfile_hold_buf; 600 601 602 /* Step 5: make a new password file with the updated info. */ 603 604 if (pw_init(dirname(passfile), passfile)) { 605 yp_error("pw_init() failed"); 606 return &result; 607 } 608 if ((pfd = pw_lock()) == -1) { 609 pw_fini(); 610 yp_error("pw_lock() failed"); 611 return &result; 612 } 613 if ((tfd = pw_tmp(-1)) == -1) { 614 pw_fini(); 615 yp_error("pw_tmp() failed"); 616 return &result; 617 } 618 if (pw_copy(pfd, tfd, &yp_password, NULL) == -1) { 619 pw_fini(); 620 yp_error("pw_copy() failed"); 621 return &result; 622 } 623 if (rename(passfile, passfile_hold) == -1) { 624 pw_fini(); 625 yp_error("rename of %s to %s failed", passfile, 626 passfile_hold); 627 return &result; 628 } 629 630 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) { 631 /* 632 * NIS server is exporting the system's master.passwd. 633 * Call pw_mkdb to rebuild passwd and the .db files 634 */ 635 if (pw_mkdb(yp_password.pw_name) == -1) { 636 pw_fini(); 637 yp_error("pw_mkdb() failed"); 638 rename(passfile_hold, passfile); 639 return &result; 640 } 641 } else { 642 /* 643 * NIS server is exporting a private master.passwd. 644 * Rename tempfile into final location 645 */ 646 if (rename(pw_tempname(), passfile) == -1) { 647 pw_fini(); 648 yp_error("rename of %s to %s failed", 649 pw_tempname(), passfile); 650 rename(passfile_hold, passfile); 651 return &result; 652 } 653 } 654 655 pw_fini(); 656 657 if (inplace) { 658 if ((rval = update_inplace(&yp_password, domain))) { 659 yp_error("inplace update failed -- rebuilding maps"); 660 } 661 } 662 663 switch ((pid = fork())) { 664 case 0: 665 if (inplace && !rval) { 666 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 667 yppasswd_domain, "pushpw", (char *)NULL); 668 } else { 669 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 670 yppasswd_domain, (char *)NULL); 671 } 672 yp_error("couldn't exec map update process: %s", 673 strerror(errno)); 674 unlink(passfile); 675 rename(passfile_hold, passfile); 676 exit(1); 677 break; 678 case -1: 679 yp_error("fork() failed: %s", strerror(errno)); 680 unlink(passfile); 681 rename(passfile_hold, passfile); 682 return(&result); 683 break; 684 default: 685 unlink(passfile_hold); 686 break; 687 } 688 689 if (verbose) { 690 yp_error("update completed for user %s (uid %d) in %s:", 691 argp->newpw.pw_name, argp->newpw.pw_uid, passfile); 692 693 if (passwd_changed) 694 yp_error("password changed"); 695 696 if (gecos_changed) 697 yp_error("gecos changed ('%s' -> '%s')", 698 oldgecos, argp->newpw.pw_gecos); 699 700 if (shell_changed) 701 yp_error("shell changed ('%s' -> '%s')", 702 oldshell, argp->newpw.pw_shell); 703 } 704 705 result = 0; 706 return (&result); 707} 708 709/* 710 * Note that this function performs a little less sanity checking 711 * than the last one. Since only the superuser is allowed to use it, 712 * it is assumed that the caller knows what he's doing. 713 */ 714int * 715yppasswdproc_update_master_1_svc(master_yppasswd *argp, 716 struct svc_req *rqstp) 717{ 718 static int result; 719 int pfd, tfd; 720 int pid; 721 uid_t uid; 722 int rval = 0; 723 DBT key, data; 724 char *passfile_hold; 725 char passfile_buf[MAXPATHLEN + 2]; 726 char passfile_hold_buf[MAXPATHLEN + 2]; 727 struct sockaddr_in *rqhost; 728 SVCXPRT *transp; 729 struct passwd newpasswd; 730 731 result = 1; 732 transp = rqstp->rq_xprt; 733 734 /* 735 * NO AF_INET CONNETCIONS ALLOWED! 736 */ 737 rqhost = svc_getcaller(transp); 738 if (rqhost->sin_family != AF_UNIX) { 739 yp_error("Alert! %s/%d attempted to use superuser-only \ 740procedure!\n", inet_ntoa(rqhost->sin_addr), rqhost->sin_port); 741 svcerr_auth(transp, AUTH_BADCRED); 742 return(&result); 743 } 744 745 if (rqstp->rq_cred.oa_flavor != AUTH_SYS) { 746 yp_error("caller didn't send proper credentials"); 747 svcerr_auth(transp, AUTH_BADCRED); 748 return(&result); 749 } 750 751 if (__rpc_get_local_uid(transp, &uid) < 0) { 752 yp_error("caller didn't send proper credentials"); 753 svcerr_auth(transp, AUTH_BADCRED); 754 return(&result); 755 } 756 757 if (uid) { 758 yp_error("caller euid is %d, expecting 0 -- rejecting request", 759 uid); 760 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 761 return(&result); 762 } 763 764 passfile = passfile_default; 765 766 key.data = argp->newpw.pw_name; 767 key.size = strlen(argp->newpw.pw_name); 768 769 /* 770 * The superuser may add entries to the passwd maps if 771 * rpc.yppasswdd is started with the -a flag. Paranoia 772 * prevents me from allowing additions by default. 773 */ 774 if ((rval = yp_get_record(argp->domain, "master.passwd.byname", 775 &key, &data, 0)) != YP_TRUE) { 776 if (rval == YP_NOKEY) { 777 yp_error("user %s not found in passwd database", 778 argp->newpw.pw_name); 779 if (allow_additions) 780 yp_error("notice: adding user %s to \ 781master.passwd database for domain %s", argp->newpw.pw_name, argp->domain); 782 else 783 yp_error("restart rpc.yppasswdd with the -a flag to \ 784allow additions to be made to the password database"); 785 } else { 786 yp_error("database access error: %s", 787 yperr_string(rval)); 788 } 789 if (!allow_additions) 790 return(&result); 791 } else { 792 793 /* Nul terminate, please. */ 794 *((char *)data.data + data.size) = '\0'; 795 796 copy_yp_pass(data.data, 1, data.size); 797 } 798 799 /* 800 * Perform a small bit of sanity checking. 801 */ 802 if (validate_master(rval == YP_TRUE ? &yp_password:NULL,&argp->newpw)){ 803 yp_error("rejecting update attempt for %s: bad arguments", 804 argp->newpw.pw_name); 805 return(&result); 806 } 807 808 /* 809 * If the caller specified a domain other than our 'default' 810 * domain, change the path to master.passwd accordingly. 811 */ 812 813 if (strcmp(argp->domain, yppasswd_domain)) { 814 snprintf(passfile_buf, sizeof(passfile_buf), 815 "%s/%s/master.passwd", yp_dir, argp->domain); 816 passfile = (char *)&passfile_buf; 817 } 818 819 /* 820 * Create a filename to hold the original master.passwd 821 * so if our call to yppwupdate fails we can roll back 822 */ 823 snprintf(passfile_hold_buf, sizeof(passfile_hold_buf), 824 "%s.hold", passfile); 825 passfile_hold = (char *)&passfile_hold_buf; 826 827 if (pw_init(dirname(passfile), passfile)) { 828 yp_error("pw_init() failed"); 829 return &result; 830 } 831 if ((pfd = pw_lock()) == -1) { 832 pw_fini(); 833 yp_error("pw_lock() failed"); 834 return &result; 835 } 836 if ((tfd = pw_tmp(-1)) == -1) { 837 pw_fini(); 838 yp_error("pw_tmp() failed"); 839 return &result; 840 } 841 xlate_passwd(&argp->newpw, &newpasswd); 842 if (pw_copy(pfd, tfd, &newpasswd, NULL) == -1) { 843 pw_fini(); 844 yp_error("pw_copy() failed"); 845 return &result; 846 } 847 if (rename(passfile, passfile_hold) == -1) { 848 pw_fini(); 849 yp_error("rename of %s to %s failed", passfile, 850 passfile_hold); 851 return &result; 852 } 853 if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) { 854 /* 855 * NIS server is exporting the system's master.passwd. 856 * Call pw_mkdb to rebuild passwd and the .db files 857 */ 858 if (pw_mkdb(argp->newpw.pw_name) == -1) { 859 pw_fini(); 860 yp_error("pw_mkdb() failed"); 861 rename(passfile_hold, passfile); 862 return &result; 863 } 864 } else { 865 /* 866 * NIS server is exporting a private master.passwd. 867 * Rename tempfile into final location 868 */ 869 if (rename(pw_tempname(), passfile) == -1) { 870 pw_fini(); 871 yp_error("rename of %s to %s failed", 872 pw_tempname(), passfile); 873 rename(passfile_hold, passfile); 874 return &result; 875 } 876 } 877 pw_fini(); 878 879 if (inplace) { 880 xlate_passwd(&argp->newpw, &newpasswd); 881 if ((rval = update_inplace(&newpasswd, argp->domain))) { 882 yp_error("inplace update failed -- rebuilding maps"); 883 } 884 } 885 886 switch ((pid = fork())) { 887 case 0: 888 if (inplace && !rval) { 889 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 890 argp->domain, "pushpw", (char *)NULL); 891 } else { 892 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 893 argp->domain, (char *)NULL); 894 } 895 yp_error("couldn't exec map update process: %s", 896 strerror(errno)); 897 unlink(passfile); 898 rename(passfile_hold, passfile); 899 exit(1); 900 break; 901 case -1: 902 yp_error("fork() failed: %s", strerror(errno)); 903 unlink(passfile); 904 rename(passfile_hold, passfile); 905 return(&result); 906 break; 907 default: 908 unlink(passfile_hold); 909 break; 910 } 911 912 yp_error("performed update of user %s (uid %d) domain %s", 913 argp->newpw.pw_name, 914 argp->newpw.pw_uid, 915 argp->domain); 916 917 result = 0; 918 return(&result); 919} 920