yppasswdd_server.c revision 30377
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#ifndef lint 34static const char rcsid[] = 35 "$Id$"; 36#endif /* not lint */ 37 38#include <stdio.h> 39#include <string.h> 40#include <ctype.h> 41#include <stdlib.h> 42#include <unistd.h> 43#include <dirent.h> 44#include <sys/stat.h> 45#include <sys/socket.h> 46#include <netinet/in.h> 47#include <arpa/inet.h> 48#include <limits.h> 49#include <db.h> 50#include <pwd.h> 51#include <errno.h> 52#include <signal.h> 53#include <rpc/rpc.h> 54#include <rpcsvc/yp.h> 55#include <sys/types.h> 56#include <sys/wait.h> 57#include <sys/param.h> 58#include <sys/fcntl.h> 59struct dom_binding {}; 60#include <rpcsvc/ypclnt.h> 61#include "yppasswdd_extern.h" 62#include "yppasswd.h" 63#include "yppasswd_private.h" 64 65char *tempname; 66 67void reaper(sig) 68 int sig; 69{ 70 extern pid_t pid; 71 extern int pstat; 72 int st; 73 74 if (sig > 0) { 75 if (sig == SIGCHLD) 76 while(wait3(&st, WNOHANG, NULL) > 0) ; 77 } else { 78 pid = waitpid(pid, &pstat, 0); 79 } 80 return; 81} 82 83void install_reaper(on) 84 int on; 85{ 86 if (on) { 87 signal(SIGCHLD, reaper); 88 } else { 89 signal(SIGCHLD, SIG_DFL); 90 } 91 return; 92} 93 94static struct passwd yp_password; 95 96static void copy_yp_pass(p, x, m) 97char *p; 98int x, m; 99{ 100 register char *t, *s = p; 101 static char *buf; 102 103 yp_password.pw_fields = 0; 104 105 buf = (char *)realloc(buf, m + 10); 106 bzero(buf, m + 10); 107 108 /* Turn all colons into NULLs */ 109 while (strchr(s, ':')) { 110 s = (strchr(s, ':') + 1); 111 *(s - 1)= '\0'; 112 } 113 114 t = buf; 115#define EXPAND(e) e = t; while ((*t++ = *p++)); 116 EXPAND(yp_password.pw_name); 117 yp_password.pw_fields |= _PWF_NAME; 118 EXPAND(yp_password.pw_passwd); 119 yp_password.pw_fields |= _PWF_PASSWD; 120 yp_password.pw_uid = atoi(p); 121 p += (strlen(p) + 1); 122 yp_password.pw_fields |= _PWF_UID; 123 yp_password.pw_gid = atoi(p); 124 p += (strlen(p) + 1); 125 yp_password.pw_fields |= _PWF_GID; 126 if (x) { 127 EXPAND(yp_password.pw_class); 128 yp_password.pw_fields |= _PWF_CLASS; 129 yp_password.pw_change = atol(p); 130 p += (strlen(p) + 1); 131 yp_password.pw_fields |= _PWF_CHANGE; 132 yp_password.pw_expire = atol(p); 133 p += (strlen(p) + 1); 134 yp_password.pw_fields |= _PWF_EXPIRE; 135 } 136 EXPAND(yp_password.pw_gecos); 137 yp_password.pw_fields |= _PWF_GECOS; 138 EXPAND(yp_password.pw_dir); 139 yp_password.pw_fields |= _PWF_DIR; 140 EXPAND(yp_password.pw_shell); 141 yp_password.pw_fields |= _PWF_SHELL; 142 143 return; 144} 145 146static int validchars(arg) 147 char *arg; 148{ 149 int i; 150 151 for (i = 0; i < strlen(arg); i++) { 152 if (iscntrl(arg[i])) { 153 yp_error("string contains a control character"); 154 return(1); 155 } 156 if (arg[i] == ':') { 157 yp_error("string contains a colon"); 158 return(1); 159 } 160 /* Be evil: truncate strings with \n in them silently. */ 161 if (arg[i] == '\n') { 162 arg[i] = '\0'; 163 return(0); 164 } 165 } 166 return(0); 167} 168 169static int validate_master(opw, npw) 170 struct passwd *opw; 171 struct x_master_passwd *npw; 172{ 173 174 if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') { 175 yp_error("client tried to modify an NIS entry"); 176 return(1); 177 } 178 179 if (validchars(npw->pw_shell)) { 180 yp_error("specified shell contains invalid characters"); 181 return(1); 182 } 183 184 if (validchars(npw->pw_gecos)) { 185 yp_error("specified gecos field contains invalid characters"); 186 return(1); 187 } 188 189 if (validchars(npw->pw_passwd)) { 190 yp_error("specified password contains invalid characters"); 191 return(1); 192 } 193 return(0); 194} 195 196static int validate(opw, npw) 197 struct passwd *opw; 198 struct x_passwd *npw; 199{ 200 201 if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') { 202 yp_error("client tried to modify an NIS entry"); 203 return(1); 204 } 205 206 if (npw->pw_uid != opw->pw_uid) { 207 yp_error("UID mismatch: client says user %s has UID %d", 208 npw->pw_name, npw->pw_uid); 209 yp_error("database says user %s has UID %d", opw->pw_name, 210 opw->pw_uid); 211 return(1); 212 } 213 214 if (npw->pw_gid != opw->pw_gid) { 215 yp_error("GID mismatch: client says user %s has GID %d", 216 npw->pw_name, npw->pw_gid); 217 yp_error("database says user %s has GID %d", opw->pw_name, 218 opw->pw_gid); 219 return(1); 220 } 221 222 /* 223 * Don't allow the user to shoot himself in the foot, 224 * even on purpose. 225 */ 226 if (!ok_shell(npw->pw_shell)) { 227 yp_error("%s is not a valid shell", npw->pw_shell); 228 return(1); 229 } 230 231 if (validchars(npw->pw_shell)) { 232 yp_error("specified shell contains invalid characters"); 233 return(1); 234 } 235 236 if (validchars(npw->pw_gecos)) { 237 yp_error("specified gecos field contains invalid characters"); 238 return(1); 239 } 240 241 if (validchars(npw->pw_passwd)) { 242 yp_error("specified password contains invalid characters"); 243 return(1); 244 } 245 return(0); 246} 247 248/* 249 * Kludge alert: 250 * In order to have one rpc.yppasswdd support multiple domains, 251 * we have to cheat: we search each directory under /var/yp 252 * and try to match the user in each master.passwd.byname 253 * map that we find. If the user matches (username, uid and gid 254 * all agree), then we use that domain. If we match the user in 255 * more than one database, we must abort. 256 */ 257static char *find_domain(pw) 258 struct x_passwd *pw; 259{ 260 struct stat statbuf; 261 struct dirent *dirp; 262 DIR *dird; 263 char yp_mapdir[MAXPATHLEN + 2]; 264 static char domain[YPMAXDOMAIN]; 265 char *tmp = NULL; 266 DBT key, data; 267 int hit = 0; 268 269 yp_error("performing multidomain lookup"); 270 271 if ((dird = opendir(yp_dir)) == NULL) { 272 yp_error("opendir(%s) failed: %s", yp_dir, strerror(errno)); 273 return(NULL); 274 } 275 276 while ((dirp = readdir(dird)) != NULL) { 277 snprintf(yp_mapdir, sizeof(yp_mapdir), "%s/%s", 278 yp_dir, dirp->d_name); 279 if (stat(yp_mapdir, &statbuf) < 0) { 280 yp_error("stat(%s) failed: %s", yp_mapdir, 281 strerror(errno)); 282 closedir(dird); 283 return(NULL); 284 } 285 if (S_ISDIR(statbuf.st_mode)) { 286 tmp = (char *)dirp->d_name; 287 key.data = pw->pw_name; 288 key.size = strlen(pw->pw_name); 289 290 if (yp_get_record(tmp,"master.passwd.byname", 291 &key, &data, 0) != YP_TRUE) { 292 continue; 293 } 294 *(char *)(data.data + data.size) = '\0'; 295 copy_yp_pass(data.data, 1, data.size); 296 if (yp_password.pw_uid == pw->pw_uid && 297 yp_password.pw_gid == pw->pw_gid) { 298 hit++; 299 snprintf(domain, YPMAXDOMAIN, "%s", tmp); 300 } 301 } 302 } 303 304 closedir(dird); 305 if (hit > 1) { 306 yp_error("found same user in two different domains"); 307 return(NULL); 308 } else 309 return((char *)&domain); 310} 311 312static int update_inplace(pw, domain) 313 struct passwd *pw; 314 char *domain; 315{ 316 DB *dbp = NULL; 317 DBT key = { NULL, 0 }; 318 DBT data = { NULL, 0 }; 319 char pwbuf[YPMAXRECORD]; 320 char keybuf[20]; 321 int i; 322 char *maps[] = { "master.passwd.byname", "master.passwd.byuid", 323 "passwd.byname", "passwd.byuid" }; 324 325 char *formats[] = { "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s", 326 "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s", 327 "%s:%s:%d:%d:%s:%s:%s", "%s:%s:%d:%d:%s:%s:%s" }; 328 char *ptr = NULL; 329 char *yp_last = "YP_LAST_MODIFIED"; 330 char yplastbuf[YPMAXRECORD]; 331 332 snprintf(yplastbuf, sizeof(yplastbuf), "%lu", time(NULL)); 333 334 for (i = 0; i < 4; i++) { 335 336 if (i % 2) { 337 snprintf(keybuf, sizeof(keybuf), "%ld", pw->pw_uid); 338 key.data = (char *)&keybuf; 339 key.size = strlen(keybuf); 340 } else { 341 key.data = pw->pw_name; 342 key.size = strlen(pw->pw_name); 343 } 344 345 /* 346 * XXX The passwd.byname and passwd.byuid maps come in 347 * two flavors: secure and insecure. The secure version 348 * has a '*' in the password field whereas the insecure one 349 * has a real crypted password. The maps will be insecure 350 * if they were built with 'unsecure = TRUE' enabled in 351 * /var/yp/Makefile, but we'd have no way of knowing if 352 * this has been done unless we were to try parsing the 353 * Makefile, which is a disgusting thought. Instead, we 354 * read the records from the maps, skip to the first ':' 355 * in them, and then look at the character immediately 356 * following it. If it's an '*' then the map is 'secure' 357 * and we must not insert a real password into the pw_passwd 358 * field. If it's not an '*', then we put the real crypted 359 * password in. 360 */ 361 if (yp_get_record(domain,maps[i],&key,&data,1) != YP_TRUE) { 362 yp_error("couldn't read %s/%s: %s", domain, 363 maps[i], strerror(errno)); 364 return(1); 365 } 366 367 if ((ptr = strchr(data.data, ':')) == NULL) { 368 yp_error("no colon in passwd record?!"); 369 return(1); 370 } 371 372 /* 373 * XXX Supposing we have more than one user with the same 374 * UID? (Or more than one user with the same name?) We could 375 * end up modifying the wrong record if were not careful. 376 */ 377 if (i % 2) { 378 if (strncmp(data.data, pw->pw_name, 379 strlen(pw->pw_name))) { 380 yp_error("warning: found entry for UID %d \ 381in map %s@%s with wrong name (%.*s)", pw->pw_uid, maps[i], domain, 382 ptr - (char *)data.data, 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 snprintf(pwbuf, sizeof(pwbuf), ":%d:%d:", pw->pw_uid, 393 pw->pw_gid); 394 if (!strstr(data.data, pwbuf)) { 395 yp_error("warning: found entry for user %s \ 396in map %s@%s with wrong UID", pw->pw_name, maps[i], domain); 397 yp_error("there may ne more than one user 398with the same name - continuing"); 399 continue; 400 } 401 } 402 403 if (i < 2) { 404 snprintf(pwbuf, sizeof(pwbuf), formats[i], 405 pw->pw_name, pw->pw_passwd, pw->pw_uid, 406 pw->pw_gid, pw->pw_class, pw->pw_change, 407 pw->pw_expire, pw->pw_gecos, pw->pw_dir, 408 pw->pw_shell); 409 } else { 410 snprintf(pwbuf, sizeof(pwbuf), formats[i], 411 pw->pw_name, *(ptr+1) == '*' ? "*" : pw->pw_passwd, 412 pw->pw_uid, pw->pw_gid, pw->pw_gecos, pw->pw_dir, 413 pw->pw_shell); 414 } 415 416#define FLAGS O_RDWR|O_CREAT 417 418 if ((dbp = yp_open_db_rw(domain, maps[i], FLAGS)) == NULL) { 419 yp_error("couldn't open %s/%s r/w: %s",domain, 420 maps[i],strerror(errno)); 421 return(1); 422 } 423 424 data.data = pwbuf; 425 data.size = strlen(pwbuf); 426 427 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) { 428 yp_error("failed to update record in %s/%s", domain, 429 maps[i]); 430 (void)(dbp->close)(dbp); 431 return(1); 432 } 433 434 key.data = yp_last; 435 key.size = strlen(yp_last); 436 data.data = (char *)&yplastbuf; 437 data.size = strlen(yplastbuf); 438 439 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) { 440 yp_error("failed to update timestamp in %s/%s", domain, 441 maps[i]); 442 (void)(dbp->close)(dbp); 443 return(1); 444 } 445 446 (void)(dbp->close)(dbp); 447 } 448 449 return(0); 450} 451 452static char *yp_mktmpnam() 453{ 454 static char path[MAXPATHLEN]; 455 char *p; 456 457 sprintf(path,"%s",passfile); 458 if ((p = strrchr(path, '/'))) 459 ++p; 460 else 461 p = path; 462 strcpy(p, "yppwtmp.XXXXXX"); 463 return(mktemp(path)); 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 *oldshell = NULL; 479 char *oldgecos = NULL; 480 char *passfile_hold; 481 char passfile_buf[MAXPATHLEN + 2]; 482 char *domain = yppasswd_domain; 483 static struct sockaddr_in clntaddr; 484 static struct timeval t_saved, t_test; 485 486 /* 487 * Normal user updates always use the 'default' master.passwd file. 488 */ 489 490 passfile = passfile_default; 491 result = 1; 492 493 rqhost = svc_getcaller(rqstp->rq_xprt); 494 495 gettimeofday(&t_test, NULL); 496 if (!bcmp((char *)rqhost, (char *)&clntaddr, 497 sizeof(struct sockaddr_in)) && 498 t_test.tv_sec > t_saved.tv_sec && 499 t_test.tv_sec - t_saved.tv_sec < 300) { 500 501 bzero((char *)&clntaddr, sizeof(struct sockaddr_in)); 502 bzero((char *)&t_saved, sizeof(struct timeval)); 503 return(NULL); 504 } 505 506 bcopy((char *)rqhost, (char *)&clntaddr, sizeof(struct sockaddr_in)); 507 gettimeofday(&t_saved, NULL); 508 509 if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) { 510 yp_error("rejected update request from unauthorized host"); 511 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 512 return(&result); 513 } 514 515 /* 516 * Step one: find the user. (It's kinda pointless to 517 * proceed if the user doesn't exist.) We look for the 518 * user in the master.passwd.byname database, _NOT_ by 519 * using getpwent() and friends! We can't use getpwent() 520 * since the NIS master server is not guaranteed to be 521 * configured as an NIS client. 522 */ 523 524 if (multidomain) { 525 if ((domain = find_domain(&argp->newpw)) == NULL) { 526 yp_error("multidomain lookup failed - aborting update"); 527 return(&result); 528 } else 529 yp_error("updating user %s in domain %s", 530 argp->newpw.pw_name, domain); 531 } 532 533 key.data = argp->newpw.pw_name; 534 key.size = strlen(argp->newpw.pw_name); 535 536 if ((rval=yp_get_record(domain,"master.passwd.byname", 537 &key, &data, 0)) != YP_TRUE) { 538 if (rval == YP_NOKEY) { 539 yp_error("user %s not found in passwd database", 540 argp->newpw.pw_name); 541 } else { 542 yp_error("database access error: %s", 543 yperr_string(rval)); 544 } 545 return(&result); 546 } 547 548 /* Nul terminate, please. */ 549 *(char *)(data.data + data.size) = '\0'; 550 551 copy_yp_pass(data.data, 1, data.size); 552 553 /* Step 2: check that the supplied oldpass is valid. */ 554 555 if (strcmp(crypt(argp->oldpass, yp_password.pw_passwd), 556 yp_password.pw_passwd)) { 557 yp_error("rejected change attempt -- bad password"); 558 yp_error("client address: %s username: %s", 559 inet_ntoa(rqhost->sin_addr), 560 argp->newpw.pw_name); 561 return(&result); 562 } 563 564 /* Step 3: validate the arguments passed to us by the client. */ 565 566 if (validate(&yp_password, &argp->newpw)) { 567 yp_error("rejecting change attempt: bad arguments"); 568 yp_error("client address: %s username: %s", 569 inet_ntoa(rqhost->sin_addr), 570 argp->newpw.pw_name); 571 svcerr_decode(rqstp->rq_xprt); 572 return(&result); 573 } 574 575 /* Step 4: update the user's passwd structure. */ 576 577 if (!no_chsh && strcmp(argp->newpw.pw_shell, yp_password.pw_shell)) { 578 oldshell = yp_password.pw_shell; 579 yp_password.pw_shell = argp->newpw.pw_shell; 580 shell_changed++; 581 } 582 583 584 if (!no_chfn && strcmp(argp->newpw.pw_gecos, yp_password.pw_gecos)) { 585 oldgecos = yp_password.pw_gecos; 586 yp_password.pw_gecos = argp->newpw.pw_gecos; 587 gecos_changed++; 588 } 589 590 if (strcmp(argp->newpw.pw_passwd, yp_password.pw_passwd)) { 591 yp_password.pw_passwd = argp->newpw.pw_passwd; 592 yp_password.pw_change = 0; 593 passwd_changed++; 594 } 595 596 /* 597 * If the caller specified a domain other than our 'default' 598 * domain, change the path to master.passwd accordingly. 599 */ 600 601 if (strcmp(domain, yppasswd_domain)) { 602 snprintf(passfile_buf, sizeof(passfile_buf), 603 "%s/%s/master.passwd", yp_dir, domain); 604 passfile = (char *)&passfile_buf; 605 } 606 607 /* Step 5: make a new password file with the updated info. */ 608 609 if ((pfd = pw_lock()) < 0) { 610 return (&result); 611 } 612 if ((tfd = pw_tmp()) < 0) { 613 return (&result); 614 } 615 616 if (pw_copy(pfd, tfd, &yp_password)) { 617 yp_error("failed to created updated password file -- \ 618cleaning up and bailing out"); 619 unlink(tempname); 620 return(&result); 621 } 622 623 passfile_hold = yp_mktmpnam(); 624 rename(passfile, passfile_hold); 625 if (strcmp(passfile, _PATH_MASTERPASSWD)) { 626 rename(tempname, passfile); 627 } else { 628 if (pw_mkdb(argp->newpw.pw_name) < 0) { 629 yp_error("pwd_mkdb failed"); 630 return(&result); 631 } 632 } 633 634 if (inplace) { 635 if ((rval = update_inplace(&yp_password, domain))) { 636 yp_error("inplace update failed -- rebuilding maps"); 637 } 638 } 639 640 switch((pid = fork())) { 641 case 0: 642 if (inplace && !rval) { 643 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 644 yppasswd_domain, "pushpw", NULL); 645 } else { 646 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 647 yppasswd_domain, NULL); 648 } 649 yp_error("couldn't exec map update process: %s", 650 strerror(errno)); 651 unlink(passfile); 652 rename(passfile_hold, passfile); 653 exit(1); 654 break; 655 case -1: 656 yp_error("fork() failed: %s", strerror(errno)); 657 unlink(passfile); 658 rename(passfile_hold, passfile); 659 return(&result); 660 break; 661 default: 662 unlink(passfile_hold); 663 break; 664 } 665 666 if (verbose) { 667 yp_error("update completed for user %s (uid %d):", 668 argp->newpw.pw_name, 669 argp->newpw.pw_uid); 670 671 if (passwd_changed) 672 yp_error("password changed"); 673 674 if (gecos_changed) 675 yp_error("gecos changed ('%s' -> '%s')", 676 oldgecos, argp->newpw.pw_gecos); 677 678 if (shell_changed) 679 yp_error("shell changed ('%s' -> '%s')", 680 oldshell, argp->newpw.pw_shell); 681 } 682 683 result = 0; 684 return (&result); 685} 686 687struct cmessage { 688 struct cmsghdr cmsg; 689 struct cmsgcred cmcred; 690}; 691 692/* 693 * Note that this function performs a little less sanity checking 694 * than the last one. Since only the superuser is allowed to use it, 695 * it is assumed that the caller knows what he's doing. 696 */ 697int *yppasswdproc_update_master_1_svc(master_yppasswd *argp, 698 struct svc_req *rqstp) 699{ 700 static int result; 701 int pfd, tfd; 702 int pid; 703 int rval = 0; 704 DBT key, data; 705 char *passfile_hold; 706 char passfile_buf[MAXPATHLEN + 2]; 707 struct sockaddr_in *rqhost; 708 struct cmessage *cm; 709 SVCXPRT *transp; 710 711 result = 1; 712 713 /* 714 * NO AF_INET CONNETCIONS ALLOWED! 715 */ 716 rqhost = svc_getcaller(rqstp->rq_xprt); 717 if (rqhost->sin_family != AF_UNIX) { 718 yp_error("Alert! %s/%d attempted to use superuser-only \ 719procedure!\n", inet_ntoa(rqhost->sin_addr), rqhost->sin_port); 720 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 721 return(&result); 722 } 723 724 transp = rqstp->rq_xprt; 725 726 if (transp->xp_verf.oa_length < sizeof(struct cmessage) || 727 transp->xp_verf.oa_base == NULL || 728 transp->xp_verf.oa_flavor != AUTH_UNIX) { 729 yp_error("caller didn't send proper credentials"); 730 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 731 return(&result); 732 } 733 734 cm = (struct cmessage *)transp->xp_verf.oa_base; 735 if (cm->cmsg.cmsg_type != SCM_CREDS) { 736 yp_error("caller didn't send proper credentials"); 737 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 738 return(&result); 739 } 740 741 if (cm->cmcred.cmcred_euid) { 742 yp_error("caller euid is %d, expecting 0 -- rejecting request", 743 cm->cmcred.cmcred_euid); 744 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 745 return(&result); 746 } 747 748 passfile = passfile_default; 749 750 key.data = argp->newpw.pw_name; 751 key.size = strlen(argp->newpw.pw_name); 752 753 /* 754 * The superuser may add entries to the passwd maps if 755 * rpc.yppasswdd is started with the -a flag. Paranoia 756 * prevents me from allowing additions by default. 757 */ 758 if ((rval = yp_get_record(argp->domain, "master.passwd.byname", 759 &key, &data, 0)) != YP_TRUE) { 760 if (rval == YP_NOKEY) { 761 yp_error("user %s not found in passwd database", 762 argp->newpw.pw_name); 763 if (allow_additions) 764 yp_error("notice: adding user %s to \ 765master.passwd database for domain %s", argp->newpw.pw_name, argp->domain); 766 else 767 yp_error("restart rpc.yppasswdd with the -a flag to \ 768allow additions to be made to the password database"); 769 } else { 770 yp_error("database access error: %s", 771 yperr_string(rval)); 772 } 773 if (!allow_additions) 774 return(&result); 775 } else { 776 777 /* Nul terminate, please. */ 778 *(char *)(data.data + data.size) = '\0'; 779 780 copy_yp_pass(data.data, 1, data.size); 781 } 782 783 /* 784 * Perform a small bit of sanity checking. 785 */ 786 if (validate_master(rval == YP_TRUE ? &yp_password:NULL,&argp->newpw)){ 787 yp_error("rejecting update attempt for %s: bad arguments", 788 argp->newpw.pw_name); 789 return(&result); 790 } 791 792 /* 793 * If the caller specified a domain other than our 'default' 794 * domain, change the path to master.passwd accordingly. 795 */ 796 797 if (strcmp(argp->domain, yppasswd_domain)) { 798 snprintf(passfile_buf, sizeof(passfile_buf), 799 "%s/%s/master.passwd", yp_dir, argp->domain); 800 passfile = (char *)&passfile_buf; 801 } 802 803 if ((pfd = pw_lock()) < 0) { 804 return (&result); 805 } 806 if ((tfd = pw_tmp()) < 0) { 807 return (&result); 808 } 809 810 if (pw_copy(pfd, tfd, (struct passwd *)&argp->newpw)) { 811 yp_error("failed to created updated password file -- \ 812cleaning up and bailing out"); 813 unlink(tempname); 814 return(&result); 815 } 816 817 passfile_hold = yp_mktmpnam(); 818 rename(passfile, passfile_hold); 819 if (strcmp(passfile, _PATH_MASTERPASSWD)) { 820 rename(tempname, passfile); 821 } else { 822 if (pw_mkdb(argp->newpw.pw_name) < 0) { 823 yp_error("pwd_mkdb failed"); 824 return(&result); 825 } 826 } 827 828 if (inplace) { 829 if ((rval = update_inplace((struct passwd *)&argp->newpw, 830 argp->domain))) { 831 yp_error("inplace update failed -- rebuilding maps"); 832 } 833 } 834 835 switch((pid = fork())) { 836 case 0: 837 if (inplace && !rval) { 838 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 839 argp->domain, "pushpw", NULL); 840 } else { 841 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 842 argp->domain, NULL); 843 } 844 yp_error("couldn't exec map update process: %s", 845 strerror(errno)); 846 unlink(passfile); 847 rename(passfile_hold, passfile); 848 exit(1); 849 break; 850 case -1: 851 yp_error("fork() failed: %s", strerror(errno)); 852 unlink(passfile); 853 rename(passfile_hold, passfile); 854 return(&result); 855 break; 856 default: 857 unlink(passfile_hold); 858 break; 859 } 860 861 yp_error("performed update of user %s (uid %d) domain %s", 862 argp->newpw.pw_name, 863 argp->newpw.pw_uid, 864 argp->domain); 865 866 result = 0; 867 return(&result); 868} 869