yppasswdd_server.c revision 90298
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 "$FreeBSD: head/usr.sbin/rpc.yppasswdd/yppasswdd_server.c 90298 2002-02-06 15:26:07Z des $"; 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 68reaper(int sig) 69{ 70 extern pid_t pid; 71 extern int pstat; 72 int st; 73 int saved_errno; 74 75 saved_errno = errno; 76 77 if (sig > 0) { 78 if (sig == SIGCHLD) 79 while (wait3(&st, WNOHANG, NULL) > 0) ; 80 } else { 81 pid = waitpid(pid, &pstat, 0); 82 } 83 84 errno = saved_errno; 85 return; 86} 87 88void 89install_reaper(int on) 90{ 91 if (on) { 92 signal(SIGCHLD, reaper); 93 } else { 94 signal(SIGCHLD, SIG_DFL); 95 } 96 return; 97} 98 99static struct passwd yp_password; 100 101static void 102copy_yp_pass(char *p, int x, int m) 103{ 104 register char *t, *s = p; 105 static char *buf; 106 107 yp_password.pw_fields = 0; 108 109 buf = (char *)realloc(buf, m + 10); 110 bzero(buf, m + 10); 111 112 /* Turn all colons into NULLs */ 113 while (strchr(s, ':')) { 114 s = (strchr(s, ':') + 1); 115 *(s - 1)= '\0'; 116 } 117 118 t = buf; 119#define EXPAND(e) e = t; while ((*t++ = *p++)); 120 EXPAND(yp_password.pw_name); 121 yp_password.pw_fields |= _PWF_NAME; 122 EXPAND(yp_password.pw_passwd); 123 yp_password.pw_fields |= _PWF_PASSWD; 124 yp_password.pw_uid = atoi(p); 125 p += (strlen(p) + 1); 126 yp_password.pw_fields |= _PWF_UID; 127 yp_password.pw_gid = atoi(p); 128 p += (strlen(p) + 1); 129 yp_password.pw_fields |= _PWF_GID; 130 if (x) { 131 EXPAND(yp_password.pw_class); 132 yp_password.pw_fields |= _PWF_CLASS; 133 yp_password.pw_change = atol(p); 134 p += (strlen(p) + 1); 135 yp_password.pw_fields |= _PWF_CHANGE; 136 yp_password.pw_expire = atol(p); 137 p += (strlen(p) + 1); 138 yp_password.pw_fields |= _PWF_EXPIRE; 139 } 140 EXPAND(yp_password.pw_gecos); 141 yp_password.pw_fields |= _PWF_GECOS; 142 EXPAND(yp_password.pw_dir); 143 yp_password.pw_fields |= _PWF_DIR; 144 EXPAND(yp_password.pw_shell); 145 yp_password.pw_fields |= _PWF_SHELL; 146 147 return; 148} 149 150static int 151validchars(char *arg) 152{ 153 int i; 154 155 for (i = 0; i < strlen(arg); i++) { 156 if (iscntrl(arg[i])) { 157 yp_error("string contains a control character"); 158 return(1); 159 } 160 if (arg[i] == ':') { 161 yp_error("string contains a colon"); 162 return(1); 163 } 164 /* Be evil: truncate strings with \n in them silently. */ 165 if (arg[i] == '\n') { 166 arg[i] = '\0'; 167 return(0); 168 } 169 } 170 return(0); 171} 172 173static int 174validate_master(struct passwd *opw, struct x_master_passwd *npw) 175{ 176 177 if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') { 178 yp_error("client tried to modify an NIS entry"); 179 return(1); 180 } 181 182 if (validchars(npw->pw_shell)) { 183 yp_error("specified shell contains invalid characters"); 184 return(1); 185 } 186 187 if (validchars(npw->pw_gecos)) { 188 yp_error("specified gecos field contains invalid characters"); 189 return(1); 190 } 191 192 if (validchars(npw->pw_passwd)) { 193 yp_error("specified password contains invalid characters"); 194 return(1); 195 } 196 return(0); 197} 198 199static int 200validate(struct passwd *opw, struct x_passwd *npw) 201{ 202 203 if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') { 204 yp_error("client tried to modify an NIS entry"); 205 return(1); 206 } 207 208 if (npw->pw_uid != opw->pw_uid) { 209 yp_error("UID mismatch: client says user %s has UID %d", 210 npw->pw_name, npw->pw_uid); 211 yp_error("database says user %s has UID %d", opw->pw_name, 212 opw->pw_uid); 213 return(1); 214 } 215 216 if (npw->pw_gid != opw->pw_gid) { 217 yp_error("GID mismatch: client says user %s has GID %d", 218 npw->pw_name, npw->pw_gid); 219 yp_error("database says user %s has GID %d", opw->pw_name, 220 opw->pw_gid); 221 return(1); 222 } 223 224 /* 225 * Don't allow the user to shoot himself in the foot, 226 * even on purpose. 227 */ 228 if (!ok_shell(npw->pw_shell)) { 229 yp_error("%s is not a valid shell", npw->pw_shell); 230 return(1); 231 } 232 233 if (validchars(npw->pw_shell)) { 234 yp_error("specified shell contains invalid characters"); 235 return(1); 236 } 237 238 if (validchars(npw->pw_gecos)) { 239 yp_error("specified gecos field contains invalid characters"); 240 return(1); 241 } 242 243 if (validchars(npw->pw_passwd)) { 244 yp_error("specified password contains invalid characters"); 245 return(1); 246 } 247 return(0); 248} 249 250/* 251 * Kludge alert: 252 * In order to have one rpc.yppasswdd support multiple domains, 253 * we have to cheat: we search each directory under /var/yp 254 * and try to match the user in each master.passwd.byname 255 * map that we find. If the user matches (username, uid and gid 256 * all agree), then we use that domain. If we match the user in 257 * more than one database, we must abort. 258 */ 259static char * 260find_domain(struct x_passwd *pw) 261{ 262 struct stat statbuf; 263 struct dirent *dirp; 264 DIR *dird; 265 char yp_mapdir[MAXPATHLEN + 2]; 266 static char domain[YPMAXDOMAIN]; 267 char *tmp = NULL; 268 DBT key, data; 269 int hit = 0; 270 271 yp_error("performing multidomain lookup"); 272 273 if ((dird = opendir(yp_dir)) == NULL) { 274 yp_error("opendir(%s) failed: %s", yp_dir, strerror(errno)); 275 return(NULL); 276 } 277 278 while ((dirp = readdir(dird)) != NULL) { 279 snprintf(yp_mapdir, sizeof(yp_mapdir), "%s/%s", 280 yp_dir, dirp->d_name); 281 if (stat(yp_mapdir, &statbuf) < 0) { 282 yp_error("stat(%s) failed: %s", yp_mapdir, 283 strerror(errno)); 284 closedir(dird); 285 return(NULL); 286 } 287 if (S_ISDIR(statbuf.st_mode)) { 288 tmp = (char *)dirp->d_name; 289 key.data = pw->pw_name; 290 key.size = strlen(pw->pw_name); 291 292 if (yp_get_record(tmp,"master.passwd.byname", 293 &key, &data, 0) != YP_TRUE) { 294 continue; 295 } 296 *(char *)(data.data + data.size) = '\0'; 297 copy_yp_pass(data.data, 1, data.size); 298 if (yp_password.pw_uid == pw->pw_uid && 299 yp_password.pw_gid == pw->pw_gid) { 300 hit++; 301 snprintf(domain, YPMAXDOMAIN, "%s", tmp); 302 } 303 } 304 } 305 306 closedir(dird); 307 if (hit > 1) { 308 yp_error("found same user in two different domains"); 309 return(NULL); 310 } else 311 return((char *)&domain); 312} 313 314static int 315update_inplace(struct passwd *pw, char *domain) 316{ 317 DB *dbp = NULL; 318 DBT key = { NULL, 0 }; 319 DBT data = { NULL, 0 }; 320 char pwbuf[YPMAXRECORD]; 321 char keybuf[20]; 322 int i; 323 char *maps[] = { "master.passwd.byname", "master.passwd.byuid", 324 "passwd.byname", "passwd.byuid" }; 325 326 char *formats[] = { "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s", 327 "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s", 328 "%s:%s:%d:%d:%s:%s:%s", "%s:%s:%d:%d:%s:%s:%s" }; 329 char *ptr = NULL; 330 char *yp_last = "YP_LAST_MODIFIED"; 331 char yplastbuf[YPMAXRECORD]; 332 333 snprintf(yplastbuf, sizeof(yplastbuf), "%lu", time(NULL)); 334 335 for (i = 0; i < 4; i++) { 336 337 if (i % 2) { 338 snprintf(keybuf, sizeof(keybuf), "%ld", pw->pw_uid); 339 key.data = (char *)&keybuf; 340 key.size = strlen(keybuf); 341 } else { 342 key.data = pw->pw_name; 343 key.size = strlen(pw->pw_name); 344 } 345 346 /* 347 * XXX The passwd.byname and passwd.byuid maps come in 348 * two flavors: secure and insecure. The secure version 349 * has a '*' in the password field whereas the insecure one 350 * has a real crypted password. The maps will be insecure 351 * if they were built with 'unsecure = TRUE' enabled in 352 * /var/yp/Makefile, but we'd have no way of knowing if 353 * this has been done unless we were to try parsing the 354 * Makefile, which is a disgusting thought. Instead, we 355 * read the records from the maps, skip to the first ':' 356 * in them, and then look at the character immediately 357 * following it. If it's an '*' then the map is 'secure' 358 * and we must not insert a real password into the pw_passwd 359 * field. If it's not an '*', then we put the real crypted 360 * password in. 361 */ 362 if (yp_get_record(domain,maps[i],&key,&data,1) != YP_TRUE) { 363 yp_error("couldn't read %s/%s: %s", domain, 364 maps[i], strerror(errno)); 365 return(1); 366 } 367 368 if ((ptr = strchr(data.data, ':')) == NULL) { 369 yp_error("no colon in passwd record?!"); 370 return(1); 371 } 372 373 /* 374 * XXX Supposing we have more than one user with the same 375 * UID? (Or more than one user with the same name?) We could 376 * end up modifying the wrong record if were not careful. 377 */ 378 if (i % 2) { 379 if (strncmp(data.data, pw->pw_name, 380 strlen(pw->pw_name))) { 381 yp_error("warning: found entry for UID %d \ 382in map %s@%s with wrong name (%.*s)", pw->pw_uid, maps[i], domain, 383 ptr - (char *)data.data, data.data); 384 yp_error("there may be more than one user \ 385with the same UID - continuing"); 386 continue; 387 } 388 } else { 389 /* 390 * We're really being ultra-paranoid here. 391 * This is generally a 'can't happen' condition. 392 */ 393 snprintf(pwbuf, sizeof(pwbuf), ":%d:%d:", pw->pw_uid, 394 pw->pw_gid); 395 if (!strstr(data.data, pwbuf)) { 396 yp_error("warning: found entry for user %s \ 397in map %s@%s with wrong UID", pw->pw_name, maps[i], domain); 398 yp_error("there may be more than one user 399with the same name - continuing"); 400 continue; 401 } 402 } 403 404 if (i < 2) { 405 snprintf(pwbuf, sizeof(pwbuf), formats[i], 406 pw->pw_name, pw->pw_passwd, pw->pw_uid, 407 pw->pw_gid, pw->pw_class, pw->pw_change, 408 pw->pw_expire, pw->pw_gecos, pw->pw_dir, 409 pw->pw_shell); 410 } else { 411 snprintf(pwbuf, sizeof(pwbuf), formats[i], 412 pw->pw_name, *(ptr+1) == '*' ? "*" : pw->pw_passwd, 413 pw->pw_uid, pw->pw_gid, pw->pw_gecos, pw->pw_dir, 414 pw->pw_shell); 415 } 416 417#define FLAGS O_RDWR|O_CREAT 418 419 if ((dbp = yp_open_db_rw(domain, maps[i], FLAGS)) == NULL) { 420 yp_error("couldn't open %s/%s r/w: %s",domain, 421 maps[i],strerror(errno)); 422 return(1); 423 } 424 425 data.data = pwbuf; 426 data.size = strlen(pwbuf); 427 428 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) { 429 yp_error("failed to update record in %s/%s", domain, 430 maps[i]); 431 (void)(dbp->close)(dbp); 432 return(1); 433 } 434 435 key.data = yp_last; 436 key.size = strlen(yp_last); 437 data.data = (char *)&yplastbuf; 438 data.size = strlen(yplastbuf); 439 440 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) { 441 yp_error("failed to update timestamp in %s/%s", domain, 442 maps[i]); 443 (void)(dbp->close)(dbp); 444 return(1); 445 } 446 447 (void)(dbp->close)(dbp); 448 } 449 450 return(0); 451} 452 453static char * 454yp_mktmpnam(void) 455{ 456 static char path[MAXPATHLEN]; 457 char *p; 458 459 sprintf(path,"%s",passfile); 460 if ((p = strrchr(path, '/'))) 461 ++p; 462 else 463 p = path; 464 strcpy(p, "yppwtmp.XXXXXX"); 465 return(mktemp(path)); 466} 467 468int * 469yppasswdproc_update_1_svc(yppasswd *argp, struct svc_req *rqstp) 470{ 471 static int result; 472 struct sockaddr_in *rqhost; 473 DBT key, data; 474 int rval = 0; 475 int pfd, tfd; 476 int pid; 477 int passwd_changed = 0; 478 int shell_changed = 0; 479 int gecos_changed = 0; 480 char *oldshell = NULL; 481 char *oldgecos = NULL; 482 char *passfile_hold; 483 char passfile_buf[MAXPATHLEN + 2]; 484 char *domain = yppasswd_domain; 485 static struct sockaddr_in clntaddr; 486 static struct timeval t_saved, t_test; 487 488 /* 489 * Normal user updates always use the 'default' master.passwd file. 490 */ 491 492 passfile = passfile_default; 493 result = 1; 494 495 rqhost = svc_getcaller(rqstp->rq_xprt); 496 497 gettimeofday(&t_test, NULL); 498 if (!bcmp((char *)rqhost, (char *)&clntaddr, 499 sizeof(struct sockaddr_in)) && 500 t_test.tv_sec > t_saved.tv_sec && 501 t_test.tv_sec - t_saved.tv_sec < 300) { 502 503 bzero((char *)&clntaddr, sizeof(struct sockaddr_in)); 504 bzero((char *)&t_saved, sizeof(struct timeval)); 505 return(NULL); 506 } 507 508 bcopy((char *)rqhost, (char *)&clntaddr, sizeof(struct sockaddr_in)); 509 gettimeofday(&t_saved, NULL); 510 511 if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) { 512 yp_error("rejected update request from unauthorized host"); 513 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 514 return(&result); 515 } 516 517 /* 518 * Step one: find the user. (It's kinda pointless to 519 * proceed if the user doesn't exist.) We look for the 520 * user in the master.passwd.byname database, _NOT_ by 521 * using getpwent() and friends! We can't use getpwent() 522 * since the NIS master server is not guaranteed to be 523 * configured as an NIS client. 524 */ 525 526 if (multidomain) { 527 if ((domain = find_domain(&argp->newpw)) == NULL) { 528 yp_error("multidomain lookup failed - aborting update"); 529 return(&result); 530 } else 531 yp_error("updating user %s in domain %s", 532 argp->newpw.pw_name, domain); 533 } 534 535 key.data = argp->newpw.pw_name; 536 key.size = strlen(argp->newpw.pw_name); 537 538 if ((rval = yp_get_record(domain,"master.passwd.byname", 539 &key, &data, 0)) != YP_TRUE) { 540 if (rval == YP_NOKEY) { 541 yp_error("user %s not found in passwd database", 542 argp->newpw.pw_name); 543 } else { 544 yp_error("database access error: %s", 545 yperr_string(rval)); 546 } 547 return(&result); 548 } 549 550 /* Nul terminate, please. */ 551 *(char *)(data.data + data.size) = '\0'; 552 553 copy_yp_pass(data.data, 1, data.size); 554 555 /* Step 2: check that the supplied oldpass is valid. */ 556 557 if (strcmp(crypt(argp->oldpass, yp_password.pw_passwd), 558 yp_password.pw_passwd)) { 559 yp_error("rejected change attempt -- bad password"); 560 yp_error("client address: %s username: %s", 561 inet_ntoa(rqhost->sin_addr), 562 argp->newpw.pw_name); 563 return(&result); 564 } 565 566 /* Step 3: validate the arguments passed to us by the client. */ 567 568 if (validate(&yp_password, &argp->newpw)) { 569 yp_error("rejecting change attempt: bad arguments"); 570 yp_error("client address: %s username: %s", 571 inet_ntoa(rqhost->sin_addr), 572 argp->newpw.pw_name); 573 svcerr_decode(rqstp->rq_xprt); 574 return(&result); 575 } 576 577 /* Step 4: update the user's passwd structure. */ 578 579 if (!no_chsh && strcmp(argp->newpw.pw_shell, yp_password.pw_shell)) { 580 oldshell = yp_password.pw_shell; 581 yp_password.pw_shell = argp->newpw.pw_shell; 582 shell_changed++; 583 } 584 585 586 if (!no_chfn && strcmp(argp->newpw.pw_gecos, yp_password.pw_gecos)) { 587 oldgecos = yp_password.pw_gecos; 588 yp_password.pw_gecos = argp->newpw.pw_gecos; 589 gecos_changed++; 590 } 591 592 if (strcmp(argp->newpw.pw_passwd, yp_password.pw_passwd)) { 593 yp_password.pw_passwd = argp->newpw.pw_passwd; 594 yp_password.pw_change = 0; 595 passwd_changed++; 596 } 597 598 /* 599 * If the caller specified a domain other than our 'default' 600 * domain, change the path to master.passwd accordingly. 601 */ 602 603 if (strcmp(domain, yppasswd_domain)) { 604 snprintf(passfile_buf, sizeof(passfile_buf), 605 "%s/%s/master.passwd", yp_dir, domain); 606 passfile = (char *)&passfile_buf; 607 } 608 609 /* Step 5: make a new password file with the updated info. */ 610 611 if ((pfd = pw_lock()) < 0) { 612 return (&result); 613 } 614 if ((tfd = pw_tmp()) < 0) { 615 return (&result); 616 } 617 618 if (pw_copy(pfd, tfd, &yp_password)) { 619 yp_error("failed to created updated password file -- \ 620cleaning up and bailing out"); 621 unlink(tempname); 622 return(&result); 623 } 624 625 passfile_hold = yp_mktmpnam(); 626 rename(passfile, passfile_hold); 627 if (strcmp(passfile, _PATH_MASTERPASSWD)) { 628 rename(tempname, passfile); 629 } else { 630 if (pw_mkdb(argp->newpw.pw_name) < 0) { 631 yp_error("pwd_mkdb failed"); 632 return(&result); 633 } 634 } 635 636 if (inplace) { 637 if ((rval = update_inplace(&yp_password, domain))) { 638 yp_error("inplace update failed -- rebuilding maps"); 639 } 640 } 641 642 switch ((pid = fork())) { 643 case 0: 644 if (inplace && !rval) { 645 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 646 yppasswd_domain, "pushpw", (char *)NULL); 647 } else { 648 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 649 yppasswd_domain, (char *)NULL); 650 } 651 yp_error("couldn't exec map update process: %s", 652 strerror(errno)); 653 unlink(passfile); 654 rename(passfile_hold, passfile); 655 exit(1); 656 break; 657 case -1: 658 yp_error("fork() failed: %s", strerror(errno)); 659 unlink(passfile); 660 rename(passfile_hold, passfile); 661 return(&result); 662 break; 663 default: 664 unlink(passfile_hold); 665 break; 666 } 667 668 if (verbose) { 669 yp_error("update completed for user %s (uid %d):", 670 argp->newpw.pw_name, 671 argp->newpw.pw_uid); 672 673 if (passwd_changed) 674 yp_error("password changed"); 675 676 if (gecos_changed) 677 yp_error("gecos changed ('%s' -> '%s')", 678 oldgecos, argp->newpw.pw_gecos); 679 680 if (shell_changed) 681 yp_error("shell changed ('%s' -> '%s')", 682 oldshell, argp->newpw.pw_shell); 683 } 684 685 result = 0; 686 return (&result); 687} 688 689/* 690 * Note that this function performs a little less sanity checking 691 * than the last one. Since only the superuser is allowed to use it, 692 * it is assumed that the caller knows what he's doing. 693 */ 694int * 695yppasswdproc_update_master_1_svc(master_yppasswd *argp, 696 struct svc_req *rqstp) 697{ 698 static int result; 699 int pfd, tfd; 700 int pid; 701 uid_t uid; 702 int rval = 0; 703 DBT key, data; 704 char *passfile_hold; 705 char passfile_buf[MAXPATHLEN + 2]; 706 struct sockaddr_in *rqhost; 707 SVCXPRT *transp; 708 709 result = 1; 710 transp = rqstp->rq_xprt; 711 712 /* 713 * NO AF_INET CONNETCIONS ALLOWED! 714 */ 715 rqhost = svc_getcaller(transp); 716 if (rqhost->sin_family != AF_UNIX) { 717 yp_error("Alert! %s/%d attempted to use superuser-only \ 718procedure!\n", inet_ntoa(rqhost->sin_addr), rqhost->sin_port); 719 svcerr_auth(transp, AUTH_BADCRED); 720 return(&result); 721 } 722 723 if (rqstp->rq_cred.oa_flavor != AUTH_SYS) { 724 yp_error("caller didn't send proper credentials"); 725 svcerr_auth(transp, AUTH_BADCRED); 726 return(&result); 727 } 728 729 if (__rpc_get_local_uid(transp, &uid) < 0) { 730 yp_error("caller didn't send proper credentials"); 731 svcerr_auth(transp, AUTH_BADCRED); 732 return(&result); 733 } 734 735 if (uid) { 736 yp_error("caller euid is %d, expecting 0 -- rejecting request", 737 uid); 738 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED); 739 return(&result); 740 } 741 742 passfile = passfile_default; 743 744 key.data = argp->newpw.pw_name; 745 key.size = strlen(argp->newpw.pw_name); 746 747 /* 748 * The superuser may add entries to the passwd maps if 749 * rpc.yppasswdd is started with the -a flag. Paranoia 750 * prevents me from allowing additions by default. 751 */ 752 if ((rval = yp_get_record(argp->domain, "master.passwd.byname", 753 &key, &data, 0)) != YP_TRUE) { 754 if (rval == YP_NOKEY) { 755 yp_error("user %s not found in passwd database", 756 argp->newpw.pw_name); 757 if (allow_additions) 758 yp_error("notice: adding user %s to \ 759master.passwd database for domain %s", argp->newpw.pw_name, argp->domain); 760 else 761 yp_error("restart rpc.yppasswdd with the -a flag to \ 762allow additions to be made to the password database"); 763 } else { 764 yp_error("database access error: %s", 765 yperr_string(rval)); 766 } 767 if (!allow_additions) 768 return(&result); 769 } else { 770 771 /* Nul terminate, please. */ 772 *(char *)(data.data + data.size) = '\0'; 773 774 copy_yp_pass(data.data, 1, data.size); 775 } 776 777 /* 778 * Perform a small bit of sanity checking. 779 */ 780 if (validate_master(rval == YP_TRUE ? &yp_password:NULL,&argp->newpw)){ 781 yp_error("rejecting update attempt for %s: bad arguments", 782 argp->newpw.pw_name); 783 return(&result); 784 } 785 786 /* 787 * If the caller specified a domain other than our 'default' 788 * domain, change the path to master.passwd accordingly. 789 */ 790 791 if (strcmp(argp->domain, yppasswd_domain)) { 792 snprintf(passfile_buf, sizeof(passfile_buf), 793 "%s/%s/master.passwd", yp_dir, argp->domain); 794 passfile = (char *)&passfile_buf; 795 } 796 797 if ((pfd = pw_lock()) < 0) { 798 return (&result); 799 } 800 if ((tfd = pw_tmp()) < 0) { 801 return (&result); 802 } 803 804 if (pw_copy(pfd, tfd, (struct passwd *)&argp->newpw)) { 805 yp_error("failed to created updated password file -- \ 806cleaning up and bailing out"); 807 unlink(tempname); 808 return(&result); 809 } 810 811 passfile_hold = yp_mktmpnam(); 812 rename(passfile, passfile_hold); 813 if (strcmp(passfile, _PATH_MASTERPASSWD)) { 814 rename(tempname, passfile); 815 } else { 816 if (pw_mkdb(argp->newpw.pw_name) < 0) { 817 yp_error("pwd_mkdb failed"); 818 return(&result); 819 } 820 } 821 822 if (inplace) { 823 if ((rval = update_inplace((struct passwd *)&argp->newpw, 824 argp->domain))) { 825 yp_error("inplace update failed -- rebuilding maps"); 826 } 827 } 828 829 switch ((pid = fork())) { 830 case 0: 831 if (inplace && !rval) { 832 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 833 argp->domain, "pushpw", (char *)NULL); 834 } else { 835 execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile, 836 argp->domain, (char *)NULL); 837 } 838 yp_error("couldn't exec map update process: %s", 839 strerror(errno)); 840 unlink(passfile); 841 rename(passfile_hold, passfile); 842 exit(1); 843 break; 844 case -1: 845 yp_error("fork() failed: %s", strerror(errno)); 846 unlink(passfile); 847 rename(passfile_hold, passfile); 848 return(&result); 849 break; 850 default: 851 unlink(passfile_hold); 852 break; 853 } 854 855 yp_error("performed update of user %s (uid %d) domain %s", 856 argp->newpw.pw_name, 857 argp->newpw.pw_uid, 858 argp->domain); 859 860 result = 0; 861 return(&result); 862} 863