1 /*- 2 * Copyright (c) 2003 Networks Associates Technology, Inc. 3 * All rights reserved. 4 * 5 * This software was developed for the FreeBSD Project by 6 * Jacques A. Vidrine, Safeport Network Services, and Network 7 * Associates Laboratories, the Security Research Division of Network 8 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 9 * ("CBOSS"), as part of the DARPA CHATS research program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR 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 "namespace.h" 37 #include <sys/param.h> 38 #ifdef YP 39 #include <rpc/rpc.h> 40 #include <rpcsvc/yp_prot.h> 41 #include <rpcsvc/ypclnt.h> 42 #endif 43 #include <arpa/inet.h> 44 #include <errno.h> 45 #include <fcntl.h> 46 #ifdef HESIOD 47 #include <hesiod.h> 48 #endif 49 #include <netdb.h> 50 #include <nsswitch.h> 51 #include <pthread.h> 52 #include <pthread_np.h> 53 #include <pwd.h> 54 #include <stdlib.h> 55 #include <stdio.h> 56 #include <string.h> 57 #include <syslog.h> 58 #include <unistd.h> 59 #include "un-namespace.h" 60 #include <db.h> 61 #include "libc_private.h" 62 #include "pw_scan.h" 63 #include "nss_tls.h" 64 65 #ifndef CTASSERT 66 #define CTASSERT(x) _CTASSERT(x, __LINE__) 67 #define _CTASSERT(x, y) __CTASSERT(x, y) 68 #define __CTASSERT(x, y) typedef char __assert_ ## y [(x) ? 1 : -1] 69 #endif 70 71 /* Counter as stored in /etc/pwd.db */ 72 typedef int pwkeynum; 73 74 CTASSERT(MAXLOGNAME > sizeof(uid_t)); 75 CTASSERT(MAXLOGNAME > sizeof(pwkeynum)); 76 77 enum constants { 78 PWD_STORAGE_INITIAL = 1 << 10, /* 1 KByte */ 79 PWD_STORAGE_MAX = 1 << 20, /* 1 MByte */ 80 SETPWENT = 1, 81 ENDPWENT = 2, 82 HESIOD_NAME_MAX = 256 83 }; 84 85 static const ns_src defaultsrc[] = { 86 { NSSRC_COMPAT, NS_SUCCESS }, 87 { NULL, 0 } 88 }; 89 90 int __pw_match_entry(const char *, size_t, enum nss_lookup_type, 91 const char *, uid_t); 92 int __pw_parse_entry(char *, size_t, struct passwd *, int, int *errnop); 93 94 static void pwd_init(struct passwd *); 95 96 union key { 97 const char *name; 98 uid_t uid; 99 }; 100 101 static struct passwd *getpw(int (*fn)(union key, struct passwd *, char *, 102 size_t, struct passwd **), union key); 103 static int wrap_getpwnam_r(union key, struct passwd *, char *, 104 size_t, struct passwd **); 105 static int wrap_getpwuid_r(union key, struct passwd *, char *, size_t, 106 struct passwd **); 107 static int wrap_getpwent_r(union key, struct passwd *, char *, size_t, 108 struct passwd **); 109 110 static int pwdb_match_entry_v3(char *, size_t, enum nss_lookup_type, 111 const char *, uid_t); 112 static int pwdb_parse_entry_v3(char *, size_t, struct passwd *, int *); 113 static int pwdb_match_entry_v4(char *, size_t, enum nss_lookup_type, 114 const char *, uid_t); 115 static int pwdb_parse_entry_v4(char *, size_t, struct passwd *, int *); 116 117 118 struct { 119 int (*match)(char *, size_t, enum nss_lookup_type, const char *, 120 uid_t); 121 int (*parse)(char *, size_t, struct passwd *, int *); 122 } pwdb_versions[] = { 123 { NULL, NULL }, /* version 0 */ 124 { NULL, NULL }, /* version 1 */ 125 { NULL, NULL }, /* version 2 */ 126 { pwdb_match_entry_v3, pwdb_parse_entry_v3 }, /* version 3 */ 127 { pwdb_match_entry_v4, pwdb_parse_entry_v4 }, /* version 4 */ 128 }; 129 130 131 struct files_state { 132 DB *db; 133 pwkeynum keynum; 134 int stayopen; 135 int version; 136 }; 137 static void files_endstate(void *); 138 NSS_TLS_HANDLING(files); 139 static DB *pwdbopen(int *); 140 static void files_endstate(void *); 141 static int files_setpwent(void *, void *, va_list); 142 static int files_passwd(void *, void *, va_list); 143 144 145 #ifdef HESIOD 146 struct dns_state { 147 long counter; 148 }; 149 static void dns_endstate(void *); 150 NSS_TLS_HANDLING(dns); 151 static int dns_setpwent(void *, void *, va_list); 152 static int dns_passwd(void *, void *, va_list); 153 #endif 154 155 156 #ifdef YP 157 struct nis_state { 158 char domain[MAXHOSTNAMELEN]; 159 int done; 160 char *key; 161 int keylen; 162 }; 163 static void nis_endstate(void *); 164 NSS_TLS_HANDLING(nis); 165 static int nis_setpwent(void *, void *, va_list); 166 static int nis_passwd(void *, void *, va_list); 167 static int nis_map(char *, enum nss_lookup_type, char *, size_t, int *); 168 static int nis_adjunct(char *, const char *, char *, size_t); 169 #endif 170 171 172 struct compat_state { 173 DB *db; 174 pwkeynum keynum; 175 int stayopen; 176 int version; 177 DB *exclude; 178 struct passwd template; 179 char *name; 180 enum _compat { 181 COMPAT_MODE_OFF = 0, 182 COMPAT_MODE_ALL, 183 COMPAT_MODE_NAME, 184 COMPAT_MODE_NETGROUP 185 } compat; 186 }; 187 static void compat_endstate(void *); 188 NSS_TLS_HANDLING(compat); 189 static int compat_setpwent(void *, void *, va_list); 190 static int compat_passwd(void *, void *, va_list); 191 static void compat_clear_template(struct passwd *); 192 static int compat_set_template(struct passwd *, struct passwd *); 193 static int compat_use_template(struct passwd *, struct passwd *, char *, 194 size_t); 195 static int compat_redispatch(struct compat_state *, enum nss_lookup_type, 196 enum nss_lookup_type, const char *, const char *, uid_t, 197 struct passwd *, char *, size_t, int *); 198 void 199 setpwent(void) 200 { 201 static const ns_dtab dtab[] = { 202 { NSSRC_FILES, files_setpwent, (void *)SETPWENT }, 203 #ifdef HESIOD 204 { NSSRC_DNS, dns_setpwent, (void *)SETPWENT }, 205 #endif 206 #ifdef YP 207 { NSSRC_NIS, nis_setpwent, (void *)SETPWENT }, 208 #endif 209 { NSSRC_COMPAT, compat_setpwent, (void *)SETPWENT }, 210 { NULL, NULL, NULL } 211 }; 212 (void)_nsdispatch(NULL, dtab, NSDB_PASSWD, "setpwent", defaultsrc, 0); 213 } 214 215 216 int 217 setpassent(int stayopen) 218 { 219 static const ns_dtab dtab[] = { 220 { NSSRC_FILES, files_setpwent, (void *)SETPWENT }, 221 #ifdef HESIOD 222 { NSSRC_DNS, dns_setpwent, (void *)SETPWENT }, 223 #endif 224 #ifdef YP 225 { NSSRC_NIS, nis_setpwent, (void *)SETPWENT }, 226 #endif 227 { NSSRC_COMPAT, compat_setpwent, (void *)SETPWENT }, 228 { NULL, NULL, NULL } 229 }; 230 (void)_nsdispatch(NULL, dtab, NSDB_PASSWD, "setpwent", defaultsrc, 231 stayopen); 232 return (1); 233 } 234 235 236 void 237 endpwent(void) 238 { 239 static const ns_dtab dtab[] = { 240 { NSSRC_FILES, files_setpwent, (void *)ENDPWENT }, 241 #ifdef HESIOD 242 { NSSRC_DNS, dns_setpwent, (void *)ENDPWENT }, 243 #endif 244 #ifdef YP 245 { NSSRC_NIS, nis_setpwent, (void *)ENDPWENT }, 246 #endif 247 { NSSRC_COMPAT, compat_setpwent, (void *)ENDPWENT }, 248 { NULL, NULL, NULL } 249 }; 250 (void)_nsdispatch(NULL, dtab, NSDB_PASSWD, "endpwent", defaultsrc); 251 } 252 253 254 int 255 getpwent_r(struct passwd *pwd, char *buffer, size_t bufsize, 256 struct passwd **result) 257 { 258 static const ns_dtab dtab[] = { 259 { NSSRC_FILES, files_passwd, (void *)nss_lt_all }, 260 #ifdef HESIOD 261 { NSSRC_DNS, dns_passwd, (void *)nss_lt_all }, 262 #endif 263 #ifdef YP 264 { NSSRC_NIS, nis_passwd, (void *)nss_lt_all }, 265 #endif 266 { NSSRC_COMPAT, compat_passwd, (void *)nss_lt_all }, 267 { NULL, NULL, NULL } 268 }; 269 int rv, ret_errno; 270 271 pwd_init(pwd); 272 ret_errno = 0; 273 *result = NULL; 274 rv = _nsdispatch(result, dtab, NSDB_PASSWD, "getpwent_r", defaultsrc, 275 pwd, buffer, bufsize, &ret_errno); 276 if (rv == NS_SUCCESS) 277 return (0); 278 else 279 return (ret_errno); 280 } 281 282 283 int 284 getpwnam_r(const char *name, struct passwd *pwd, char *buffer, size_t bufsize, 285 struct passwd **result) 286 { 287 static const ns_dtab dtab[] = { 288 { NSSRC_FILES, files_passwd, (void *)nss_lt_name }, 289 #ifdef HESIOD 290 { NSSRC_DNS, dns_passwd, (void *)nss_lt_name }, 291 #endif 292 #ifdef YP 293 { NSSRC_NIS, nis_passwd, (void *)nss_lt_name }, 294 #endif 295 { NSSRC_COMPAT, compat_passwd, (void *)nss_lt_name }, 296 { NULL, NULL, NULL } 297 }; 298 int rv, ret_errno; 299 300 pwd_init(pwd); 301 ret_errno = 0; 302 *result = NULL; 303 rv = _nsdispatch(result, dtab, NSDB_PASSWD, "getpwnam_r", defaultsrc, 304 name, pwd, buffer, bufsize, &ret_errno); 305 if (rv == NS_SUCCESS) 306 return (0); 307 else 308 return (ret_errno); 309 } 310 311 312 int 313 getpwuid_r(uid_t uid, struct passwd *pwd, char *buffer, size_t bufsize, 314 struct passwd **result) 315 { 316 static const ns_dtab dtab[] = { 317 { NSSRC_FILES, files_passwd, (void *)nss_lt_id }, 318 #ifdef HESIOD 319 { NSSRC_DNS, dns_passwd, (void *)nss_lt_id }, 320 #endif 321 #ifdef YP 322 { NSSRC_NIS, nis_passwd, (void *)nss_lt_id }, 323 #endif 324 { NSSRC_COMPAT, compat_passwd, (void *)nss_lt_id }, 325 { NULL, NULL, NULL } 326 }; 327 int rv, ret_errno; 328 329 pwd_init(pwd); 330 ret_errno = 0; 331 *result = NULL; 332 rv = _nsdispatch(result, dtab, NSDB_PASSWD, "getpwuid_r", defaultsrc, 333 uid, pwd, buffer, bufsize, &ret_errno); 334 if (rv == NS_SUCCESS) 335 return (0); 336 else 337 return (ret_errno); 338 } 339 340 341 static void 342 pwd_init(struct passwd *pwd) 343 { 344 static char nul[] = ""; 345 346 memset(pwd, 0, sizeof(*pwd)); 347 pwd->pw_uid = (uid_t)-1; /* Considered least likely to lead to */ 348 pwd->pw_gid = (gid_t)-1; /* a security issue. */ 349 pwd->pw_name = nul; 350 pwd->pw_passwd = nul; 351 pwd->pw_class = nul; 352 pwd->pw_gecos = nul; 353 pwd->pw_dir = nul; 354 pwd->pw_shell = nul; 355 } 356 357 358 static struct passwd pwd; 359 static char *pwd_storage; 360 static size_t pwd_storage_size; 361 362 363 static struct passwd * 364 getpw(int (*fn)(union key, struct passwd *, char *, size_t, struct passwd **), 365 union key key) 366 { 367 int rv; 368 struct passwd *res; 369 370 if (pwd_storage == NULL) { 371 pwd_storage = malloc(PWD_STORAGE_INITIAL); 372 if (pwd_storage == NULL) 373 return (NULL); 374 pwd_storage_size = PWD_STORAGE_INITIAL; 375 } 376 do { 377 rv = fn(key, &pwd, pwd_storage, pwd_storage_size, &res); 378 if (res == NULL && rv == ERANGE) { 379 free(pwd_storage); 380 if ((pwd_storage_size << 1) > PWD_STORAGE_MAX) { 381 pwd_storage = NULL; 382 return (NULL); 383 } 384 pwd_storage_size <<= 1; 385 pwd_storage = malloc(pwd_storage_size); 386 if (pwd_storage == NULL) 387 return (NULL); 388 } 389 } while (res == NULL && rv == ERANGE); 390 return (res); 391 } 392 393 394 static int 395 wrap_getpwnam_r(union key key, struct passwd *pwd, char *buffer, 396 size_t bufsize, struct passwd **res) 397 { 398 return (getpwnam_r(key.name, pwd, buffer, bufsize, res)); 399 } 400 401 402 static int 403 wrap_getpwuid_r(union key key, struct passwd *pwd, char *buffer, 404 size_t bufsize, struct passwd **res) 405 { 406 return (getpwuid_r(key.uid, pwd, buffer, bufsize, res)); 407 } 408 409 410 static int 411 wrap_getpwent_r(union key key __unused, struct passwd *pwd, char *buffer, 412 size_t bufsize, struct passwd **res) 413 { 414 return (getpwent_r(pwd, buffer, bufsize, res)); 415 } 416 417 418 struct passwd * 419 getpwnam(const char *name) 420 { 421 union key key; 422 423 key.name = name; 424 return (getpw(wrap_getpwnam_r, key)); 425 } 426 427 428 struct passwd * 429 getpwuid(uid_t uid) 430 { 431 union key key; 432 433 key.uid = uid; 434 return (getpw(wrap_getpwuid_r, key)); 435 } 436 437 438 struct passwd * 439 getpwent(void) 440 { 441 union key key; 442 443 key.uid = 0; /* not used */ 444 return (getpw(wrap_getpwent_r, key)); 445 } 446 447 448 /* 449 * files backend 450 */ 451 static DB * 452 pwdbopen(int *version) 453 { 454 DB *res; 455 DBT key, entry; 456 int rv; 457 458 if (geteuid() != 0 || 459 (res = dbopen(_PATH_SMP_DB, O_RDONLY, 0, DB_HASH, NULL)) == NULL) 460 res = dbopen(_PATH_MP_DB, O_RDONLY, 0, DB_HASH, NULL); 461 if (res == NULL) 462 return (NULL); 463 key.data = _PWD_VERSION_KEY; 464 key.size = strlen(_PWD_VERSION_KEY); 465 rv = res->get(res, &key, &entry, 0); 466 if (rv == 0) 467 *version = *(unsigned char *)entry.data; 468 else 469 *version = 3; 470 if (*version < 3 || 471 *version >= sizeof(pwdb_versions)/sizeof(pwdb_versions[0])) { 472 syslog(LOG_CRIT, "Unsupported password database version %d", 473 *version); 474 res->close(res); 475 res = NULL; 476 } 477 return (res); 478 } 479 480 481 static void 482 files_endstate(void *p) 483 { 484 DB *db; 485 486 if (p == NULL) 487 return; 488 db = ((struct files_state *)p)->db; 489 if (db != NULL) 490 db->close(db); 491 free(p); 492 } 493 494 495 static int 496 files_setpwent(void *retval, void *mdata, va_list ap) 497 { 498 struct files_state *st; 499 int rv, stayopen; 500 501 rv = files_getstate(&st); 502 if (rv != 0) 503 return (NS_UNAVAIL); 504 switch ((enum constants)mdata) { 505 case SETPWENT: 506 stayopen = va_arg(ap, int); 507 st->keynum = 0; 508 if (stayopen) 509 st->db = pwdbopen(&st->version); 510 st->stayopen = stayopen; 511 break; 512 case ENDPWENT: 513 if (st->db != NULL) { 514 (void)st->db->close(st->db); 515 st->db = NULL; 516 } 517 break; 518 default: 519 break; 520 } 521 return (NS_UNAVAIL); 522 } 523 524 525 static int 526 files_passwd(void *retval, void *mdata, va_list ap) 527 { 528 char keybuf[MAXLOGNAME + 1]; 529 DBT key, entry; 530 struct files_state *st; 531 enum nss_lookup_type how; 532 const char *name; 533 struct passwd *pwd; 534 char *buffer; 535 size_t bufsize, namesize; 536 uid_t uid; 537 uint32_t store; 538 int rv, stayopen, *errnop; 539 540 name = NULL; 541 uid = (uid_t)-1; 542 how = (enum nss_lookup_type)mdata; 543 switch (how) { 544 case nss_lt_name: 545 name = va_arg(ap, const char *); 546 keybuf[0] = _PW_KEYBYNAME; 547 break; 548 case nss_lt_id: 549 uid = va_arg(ap, uid_t); 550 keybuf[0] = _PW_KEYBYUID; 551 break; 552 case nss_lt_all: 553 keybuf[0] = _PW_KEYBYNUM; 554 break; 555 default: 556 rv = NS_NOTFOUND; 557 goto fin; 558 } 559 pwd = va_arg(ap, struct passwd *); 560 buffer = va_arg(ap, char *); 561 bufsize = va_arg(ap, size_t); 562 errnop = va_arg(ap, int *); 563 *errnop = files_getstate(&st); 564 if (*errnop != 0) 565 return (NS_UNAVAIL); 566 if (how == nss_lt_all && st->keynum < 0) { 567 rv = NS_NOTFOUND; 568 goto fin; 569 } 570 if (st->db == NULL && 571 (st->db = pwdbopen(&st->version)) == NULL) { 572 *errnop = errno; 573 rv = NS_UNAVAIL; 574 goto fin; 575 } 576 if (how == nss_lt_all) 577 stayopen = 1; 578 else 579 stayopen = st->stayopen; 580 key.data = keybuf; 581 do { 582 switch (how) { 583 case nss_lt_name: 584 /* MAXLOGNAME includes NUL byte, but we do not 585 * include the NUL byte in the key. 586 */ 587 namesize = strlcpy(&keybuf[1], name, sizeof(keybuf)-1); 588 if (namesize >= sizeof(keybuf)-1) { 589 *errnop = EINVAL; 590 rv = NS_NOTFOUND; 591 goto fin; 592 } 593 key.size = namesize + 1; 594 break; 595 case nss_lt_id: 596 if (st->version < _PWD_CURRENT_VERSION) { 597 memcpy(&keybuf[1], &uid, sizeof(uid)); 598 key.size = sizeof(uid) + 1; 599 } else { 600 store = htonl(uid); 601 memcpy(&keybuf[1], &store, sizeof(store)); 602 key.size = sizeof(store) + 1; 603 } 604 break; 605 case nss_lt_all: 606 st->keynum++; 607 if (st->version < _PWD_CURRENT_VERSION) { 608 memcpy(&keybuf[1], &st->keynum, 609 sizeof(st->keynum)); 610 key.size = sizeof(st->keynum) + 1; 611 } else { 612 store = htonl(st->keynum); 613 memcpy(&keybuf[1], &store, sizeof(store)); 614 key.size = sizeof(store) + 1; 615 } 616 break; 617 } 618 keybuf[0] = _PW_VERSIONED(keybuf[0], st->version); 619 rv = st->db->get(st->db, &key, &entry, 0); 620 if (rv < 0 || rv > 1) { /* should never return > 1 */ 621 *errnop = errno; 622 rv = NS_UNAVAIL; 623 goto fin; 624 } else if (rv == 1) { 625 if (how == nss_lt_all) 626 st->keynum = -1; 627 rv = NS_NOTFOUND; 628 goto fin; 629 } 630 rv = pwdb_versions[st->version].match(entry.data, entry.size, 631 how, name, uid); 632 if (rv != NS_SUCCESS) 633 continue; 634 if (entry.size > bufsize) { 635 *errnop = ERANGE; 636 rv = NS_RETURN; 637 break; 638 } 639 memcpy(buffer, entry.data, entry.size); 640 rv = pwdb_versions[st->version].parse(buffer, entry.size, pwd, 641 errnop); 642 } while (how == nss_lt_all && !(rv & NS_TERMINATE)); 643 fin: 644 if (!stayopen && st->db != NULL) { 645 (void)st->db->close(st->db); 646 st->db = NULL; 647 } 648 if (rv == NS_SUCCESS) { 649 pwd->pw_fields &= ~_PWF_SOURCE; 650 pwd->pw_fields |= _PWF_FILES; 651 if (retval != NULL) 652 *(struct passwd **)retval = pwd; 653 } 654 return (rv); 655 } 656 657 658 static int 659 pwdb_match_entry_v3(char *entry, size_t entrysize, enum nss_lookup_type how, 660 const char *name, uid_t uid) 661 { 662 const char *p, *eom; 663 uid_t uid2; 664 665 eom = &entry[entrysize]; 666 for (p = entry; p < eom; p++) 667 if (*p == '\0') 668 break; 669 if (*p != '\0') 670 return (NS_NOTFOUND); 671 if (how == nss_lt_all) 672 return (NS_SUCCESS); 673 if (how == nss_lt_name) 674 return (strcmp(name, entry) == 0 ? NS_SUCCESS : NS_NOTFOUND); 675 for (p++; p < eom; p++) 676 if (*p == '\0') 677 break; 678 if (*p != '\0' || (++p) + sizeof(uid) >= eom) 679 return (NS_NOTFOUND); 680 memcpy(&uid2, p, sizeof(uid2)); 681 return (uid == uid2 ? NS_SUCCESS : NS_NOTFOUND); 682 } 683 684 685 static int 686 pwdb_parse_entry_v3(char *buffer, size_t bufsize, struct passwd *pwd, 687 int *errnop) 688 { 689 char *p, *eom; 690 int32_t pw_change, pw_expire; 691 692 /* THIS CODE MUST MATCH THAT IN pwd_mkdb. */ 693 p = buffer; 694 eom = &buffer[bufsize]; 695 #define STRING(field) do { \ 696 (field) = p; \ 697 while (p < eom && *p != '\0') \ 698 p++; \ 699 if (p >= eom) \ 700 return (NS_NOTFOUND); \ 701 p++; \ 702 } while (0) 703 #define SCALAR(field) do { \ 704 if (p + sizeof(field) > eom) \ 705 return (NS_NOTFOUND); \ 706 memcpy(&(field), p, sizeof(field)); \ 707 p += sizeof(field); \ 708 } while (0) 709 STRING(pwd->pw_name); 710 STRING(pwd->pw_passwd); 711 SCALAR(pwd->pw_uid); 712 SCALAR(pwd->pw_gid); 713 SCALAR(pw_change); 714 STRING(pwd->pw_class); 715 STRING(pwd->pw_gecos); 716 STRING(pwd->pw_dir); 717 STRING(pwd->pw_shell); 718 SCALAR(pw_expire); 719 SCALAR(pwd->pw_fields); 720 #undef STRING 721 #undef SCALAR 722 pwd->pw_change = pw_change; 723 pwd->pw_expire = pw_expire; 724 return (NS_SUCCESS); 725 } 726 727 728 static int 729 pwdb_match_entry_v4(char *entry, size_t entrysize, enum nss_lookup_type how, 730 const char *name, uid_t uid) 731 { 732 const char *p, *eom; 733 uint32_t uid2; 734 735 eom = &entry[entrysize]; 736 for (p = entry; p < eom; p++) 737 if (*p == '\0') 738 break; 739 if (*p != '\0') 740 return (NS_NOTFOUND); 741 if (how == nss_lt_all) 742 return (NS_SUCCESS); 743 if (how == nss_lt_name) 744 return (strcmp(name, entry) == 0 ? NS_SUCCESS : NS_NOTFOUND); 745 for (p++; p < eom; p++) 746 if (*p == '\0') 747 break; 748 if (*p != '\0' || (++p) + sizeof(uid) >= eom) 749 return (NS_NOTFOUND); 750 memcpy(&uid2, p, sizeof(uid2)); 751 uid2 = ntohl(uid2); 752 return (uid == (uid_t)uid2 ? NS_SUCCESS : NS_NOTFOUND); 753 } 754 755 756 static int 757 pwdb_parse_entry_v4(char *buffer, size_t bufsize, struct passwd *pwd, 758 int *errnop) 759 { 760 char *p, *eom; 761 uint32_t n; 762 763 /* THIS CODE MUST MATCH THAT IN pwd_mkdb. */ 764 p = buffer; 765 eom = &buffer[bufsize]; 766 #define STRING(field) do { \ 767 (field) = p; \ 768 while (p < eom && *p != '\0') \ 769 p++; \ 770 if (p >= eom) \ 771 return (NS_NOTFOUND); \ 772 p++; \ 773 } while (0) 774 #define SCALAR(field) do { \ 775 if (p + sizeof(n) > eom) \ 776 return (NS_NOTFOUND); \ 777 memcpy(&n, p, sizeof(n)); \ 778 (field) = ntohl(n); \ 779 p += sizeof(n); \ 780 } while (0) 781 STRING(pwd->pw_name); 782 STRING(pwd->pw_passwd); 783 SCALAR(pwd->pw_uid); 784 SCALAR(pwd->pw_gid); 785 SCALAR(pwd->pw_change); 786 STRING(pwd->pw_class); 787 STRING(pwd->pw_gecos); 788 STRING(pwd->pw_dir); 789 STRING(pwd->pw_shell); 790 SCALAR(pwd->pw_expire); 791 SCALAR(pwd->pw_fields); 792 #undef STRING 793 #undef SCALAR 794 return (NS_SUCCESS); 795 } 796 797 798 #ifdef HESIOD 799 /* 800 * dns backend 801 */ 802 static void 803 dns_endstate(void *p) 804 { 805 free(p); 806 } 807 808 809 static int 810 dns_setpwent(void *retval, void *mdata, va_list ap) 811 { 812 struct dns_state *st; 813 int rv; 814 815 rv = dns_getstate(&st); 816 if (rv != 0) 817 return (NS_UNAVAIL); 818 st->counter = 0; 819 return (NS_UNAVAIL); 820 } 821 822 823 static int 824 dns_passwd(void *retval, void *mdata, va_list ap) 825 { 826 char buf[HESIOD_NAME_MAX]; 827 struct dns_state *st; 828 struct passwd *pwd; 829 const char *name, *label; 830 void *ctx; 831 char *buffer, **hes; 832 size_t bufsize, linesize; 833 uid_t uid; 834 enum nss_lookup_type how; 835 int rv, *errnop; 836 837 ctx = NULL; 838 hes = NULL; 839 name = NULL; 840 uid = (uid_t)-1; 841 how = (enum nss_lookup_type)mdata; 842 switch (how) { 843 case nss_lt_name: 844 name = va_arg(ap, const char *); 845 break; 846 case nss_lt_id: 847 uid = va_arg(ap, uid_t); 848 break; 849 case nss_lt_all: 850 break; 851 } 852 pwd = va_arg(ap, struct passwd *); 853 buffer = va_arg(ap, char *); 854 bufsize = va_arg(ap, size_t); 855 errnop = va_arg(ap, int *); 856 *errnop = dns_getstate(&st); 857 if (*errnop != 0) 858 return (NS_UNAVAIL); 859 if (hesiod_init(&ctx) != 0) { 860 *errnop = errno; 861 rv = NS_UNAVAIL; 862 goto fin; 863 } 864 do { 865 rv = NS_NOTFOUND; 866 switch (how) { 867 case nss_lt_name: 868 label = name; 869 break; 870 case nss_lt_id: 871 if (snprintf(buf, sizeof(buf), "%lu", 872 (unsigned long)uid) >= sizeof(buf)) 873 goto fin; 874 label = buf; 875 break; 876 case nss_lt_all: 877 if (st->counter < 0) 878 goto fin; 879 if (snprintf(buf, sizeof(buf), "passwd-%ld", 880 st->counter++) >= sizeof(buf)) 881 goto fin; 882 label = buf; 883 break; 884 } 885 hes = hesiod_resolve(ctx, label, 886 how == nss_lt_id ? "uid" : "passwd"); 887 if (hes == NULL) { 888 if (how == nss_lt_all) 889 st->counter = -1; 890 if (errno != ENOENT) 891 *errnop = errno; 892 goto fin; 893 } 894 rv = __pw_match_entry(hes[0], strlen(hes[0]), how, name, uid); 895 if (rv != NS_SUCCESS) { 896 hesiod_free_list(ctx, hes); 897 hes = NULL; 898 continue; 899 } 900 linesize = strlcpy(buffer, hes[0], bufsize); 901 if (linesize >= bufsize) { 902 *errnop = ERANGE; 903 rv = NS_RETURN; 904 continue; 905 } 906 hesiod_free_list(ctx, hes); 907 hes = NULL; 908 rv = __pw_parse_entry(buffer, bufsize, pwd, 0, errnop); 909 } while (how == nss_lt_all && !(rv & NS_TERMINATE)); 910 fin: 911 if (hes != NULL) 912 hesiod_free_list(ctx, hes); 913 if (ctx != NULL) 914 hesiod_end(ctx); 915 if (rv == NS_SUCCESS) { 916 pwd->pw_fields &= ~_PWF_SOURCE; 917 pwd->pw_fields |= _PWF_HESIOD; 918 if (retval != NULL) 919 *(struct passwd **)retval = pwd; 920 } 921 return (rv); 922 } 923 #endif /* HESIOD */ 924 925 926 #ifdef YP 927 /* 928 * nis backend 929 */ 930 static void 931 nis_endstate(void *p) 932 { 933 free(((struct nis_state *)p)->key); 934 free(p); 935 } 936 937 static int 938 nis_map(char *domain, enum nss_lookup_type how, char *buffer, size_t bufsize, 939 int *master) 940 { 941 int rv, order; 942 943 *master = 0; 944 if (geteuid() == 0) { 945 if (snprintf(buffer, bufsize, "master.passwd.by%s", 946 (how == nss_lt_id) ? "uid" : "name") >= bufsize) 947 return (NS_UNAVAIL); 948 rv = yp_order(domain, buffer, &order); 949 if (rv == 0) { 950 *master = 1; 951 return (NS_SUCCESS); 952 } 953 } 954 if (snprintf(buffer, bufsize, "passwd.by%s", 955 (how == nss_lt_id) ? "uid" : "name") >= bufsize) 956 return (NS_UNAVAIL); 957 rv = yp_order(domain, buffer, &order); 958 if (rv == 0) 959 return (NS_SUCCESS); 960 return (NS_UNAVAIL); 961 } 962 963 964 static int 965 nis_adjunct(char *domain, const char *name, char *buffer, size_t bufsize) 966 { 967 int rv; 968 char *result, *p, *q, *eor; 969 int resultlen; 970 971 result = NULL; 972 rv = yp_match(domain, "passwd.adjunct.byname", name, strlen(name), 973 &result, &resultlen); 974 if (rv != 0) 975 rv = 1; 976 else { 977 eor = &result[resultlen]; 978 p = memchr(result, ':', eor - result); 979 if (p != NULL && ++p < eor && 980 (q = memchr(p, ':', eor - p)) != NULL) { 981 if (q - p >= bufsize) 982 rv = -1; 983 else { 984 memcpy(buffer, p, q - p); 985 buffer[q - p] ='\0'; 986 } 987 } else 988 rv = 1; 989 } 990 free(result); 991 return (rv); 992 } 993 994 995 static int 996 nis_setpwent(void *retval, void *mdata, va_list ap) 997 { 998 struct nis_state *st; 999 int rv; 1000 1001 rv = nis_getstate(&st); 1002 if (rv != 0) 1003 return (NS_UNAVAIL); 1004 st->done = 0; 1005 free(st->key); 1006 st->key = NULL; 1007 return (NS_UNAVAIL); 1008 } 1009 1010 1011 static int 1012 nis_passwd(void *retval, void *mdata, va_list ap) 1013 { 1014 char map[YPMAXMAP]; 1015 struct nis_state *st; 1016 struct passwd *pwd; 1017 const char *name; 1018 char *buffer, *key, *result; 1019 size_t bufsize; 1020 uid_t uid; 1021 enum nss_lookup_type how; 1022 int *errnop, keylen, resultlen, rv, master; 1023 1024 name = NULL; 1025 uid = (uid_t)-1; 1026 how = (enum nss_lookup_type)mdata; 1027 switch (how) { 1028 case nss_lt_name: 1029 name = va_arg(ap, const char *); 1030 break; 1031 case nss_lt_id: 1032 uid = va_arg(ap, uid_t); 1033 break; 1034 case nss_lt_all: 1035 break; 1036 } 1037 pwd = va_arg(ap, struct passwd *); 1038 buffer = va_arg(ap, char *); 1039 bufsize = va_arg(ap, size_t); 1040 errnop = va_arg(ap, int *); 1041 *errnop = nis_getstate(&st); 1042 if (*errnop != 0) 1043 return (NS_UNAVAIL); 1044 if (st->domain[0] == '\0') { 1045 if (getdomainname(st->domain, sizeof(st->domain)) != 0) { 1046 *errnop = errno; 1047 return (NS_UNAVAIL); 1048 } 1049 } 1050 rv = nis_map(st->domain, how, map, sizeof(map), &master); 1051 if (rv != NS_SUCCESS) 1052 return (rv); 1053 result = NULL; 1054 do { 1055 rv = NS_NOTFOUND; 1056 switch (how) { 1057 case nss_lt_name: 1058 if (strlcpy(buffer, name, bufsize) >= bufsize) 1059 goto erange; 1060 break; 1061 case nss_lt_id: 1062 if (snprintf(buffer, bufsize, "%lu", 1063 (unsigned long)uid) >= bufsize) 1064 goto erange; 1065 break; 1066 case nss_lt_all: 1067 if (st->done) 1068 goto fin; 1069 break; 1070 } 1071 result = NULL; 1072 if (how == nss_lt_all) { 1073 if (st->key == NULL) 1074 rv = yp_first(st->domain, map, &st->key, 1075 &st->keylen, &result, &resultlen); 1076 else { 1077 key = st->key; 1078 keylen = st->keylen; 1079 st->key = NULL; 1080 rv = yp_next(st->domain, map, key, keylen, 1081 &st->key, &st->keylen, &result, 1082 &resultlen); 1083 free(key); 1084 } 1085 if (rv != 0) { 1086 free(result); 1087 free(st->key); 1088 st->key = NULL; 1089 if (rv == YPERR_NOMORE) 1090 st->done = 1; 1091 else 1092 rv = NS_UNAVAIL; 1093 goto fin; 1094 } 1095 } else { 1096 rv = yp_match(st->domain, map, buffer, strlen(buffer), 1097 &result, &resultlen); 1098 if (rv == YPERR_KEY) { 1099 rv = NS_NOTFOUND; 1100 continue; 1101 } else if (rv != 0) { 1102 free(result); 1103 rv = NS_UNAVAIL; 1104 continue; 1105 } 1106 } 1107 if (resultlen >= bufsize) 1108 goto erange; 1109 memcpy(buffer, result, resultlen); 1110 buffer[resultlen] = '\0'; 1111 free(result); 1112 rv = __pw_match_entry(buffer, resultlen, how, name, uid); 1113 if (rv == NS_SUCCESS) 1114 rv = __pw_parse_entry(buffer, resultlen, pwd, master, 1115 errnop); 1116 } while (how == nss_lt_all && !(rv & NS_TERMINATE)); 1117 fin: 1118 if (rv == NS_SUCCESS) { 1119 if (strstr(pwd->pw_passwd, "##") != NULL) { 1120 rv = nis_adjunct(st->domain, name, 1121 &buffer[resultlen+1], bufsize-resultlen-1); 1122 if (rv < 0) 1123 goto erange; 1124 else if (rv == 0) 1125 pwd->pw_passwd = &buffer[resultlen+1]; 1126 } 1127 pwd->pw_fields &= ~_PWF_SOURCE; 1128 pwd->pw_fields |= _PWF_NIS; 1129 if (retval != NULL) 1130 *(struct passwd **)retval = pwd; 1131 } 1132 return (rv); 1133 erange: 1134 *errnop = ERANGE; 1135 return (NS_RETURN); 1136 } 1137 #endif /* YP */ 1138 1139 1140 /* 1141 * compat backend 1142 */ 1143 static void 1144 compat_clear_template(struct passwd *template) 1145 { 1146 1147 free(template->pw_passwd); 1148 free(template->pw_gecos); 1149 free(template->pw_dir); 1150 free(template->pw_shell); 1151 memset(template, 0, sizeof(*template)); 1152 } 1153 1154 1155 static int 1156 compat_set_template(struct passwd *src, struct passwd *template) 1157 { 1158 1159 compat_clear_template(template); 1160 #ifdef PW_OVERRIDE_PASSWD 1161 if ((src->pw_fields & _PWF_PASSWD) && 1162 (template->pw_passwd = strdup(src->pw_passwd)) == NULL) 1163 goto enomem; 1164 #endif 1165 if (src->pw_fields & _PWF_UID) 1166 template->pw_uid = src->pw_uid; 1167 if (src->pw_fields & _PWF_GID) 1168 template->pw_gid = src->pw_gid; 1169 if ((src->pw_fields & _PWF_GECOS) && 1170 (template->pw_gecos = strdup(src->pw_gecos)) == NULL) 1171 goto enomem; 1172 if ((src->pw_fields & _PWF_DIR) && 1173 (template->pw_dir = strdup(src->pw_dir)) == NULL) 1174 goto enomem; 1175 if ((src->pw_fields & _PWF_SHELL) && 1176 (template->pw_shell = strdup(src->pw_shell)) == NULL) 1177 goto enomem; 1178 template->pw_fields = src->pw_fields; 1179 return (0); 1180 enomem: 1181 syslog(LOG_ERR, "getpwent memory allocation failure"); 1182 return (-1); 1183 } 1184 1185 1186 static int 1187 compat_use_template(struct passwd *pwd, struct passwd *template, char *buffer, 1188 size_t bufsize) 1189 { 1190 struct passwd hold; 1191 char *copy, *p, *q, *eob; 1192 size_t n; 1193 1194 /* We cannot know the layout of the password fields in `buffer', 1195 * so we have to copy everything. 1196 */ 1197 if (template->pw_fields == 0) /* nothing to fill-in */ 1198 return (0); 1199 n = 0; 1200 n += pwd->pw_name != NULL ? strlen(pwd->pw_name) + 1 : 0; 1201 n += pwd->pw_passwd != NULL ? strlen(pwd->pw_passwd) + 1 : 0; 1202 n += pwd->pw_class != NULL ? strlen(pwd->pw_class) + 1 : 0; 1203 n += pwd->pw_gecos != NULL ? strlen(pwd->pw_gecos) + 1 : 0; 1204 n += pwd->pw_dir != NULL ? strlen(pwd->pw_dir) + 1 : 0; 1205 n += pwd->pw_shell != NULL ? strlen(pwd->pw_shell) + 1 : 0; 1206 copy = malloc(n); 1207 if (copy == NULL) { 1208 syslog(LOG_ERR, "getpwent memory allocation failure"); 1209 return (ENOMEM); 1210 } 1211 p = copy; 1212 eob = ©[n]; 1213 #define COPY(field) do { \ 1214 if (pwd->field == NULL) \ 1215 hold.field = NULL; \ 1216 else { \ 1217 hold.field = p; \ 1218 p += strlcpy(p, pwd->field, eob-p) + 1; \ 1219 } \ 1220 } while (0) 1221 COPY(pw_name); 1222 COPY(pw_passwd); 1223 COPY(pw_class); 1224 COPY(pw_gecos); 1225 COPY(pw_dir); 1226 COPY(pw_shell); 1227 #undef COPY 1228 p = buffer; 1229 eob = &buffer[bufsize]; 1230 #define COPY(field, flag) do { \ 1231 q = (template->pw_fields & flag) ? template->field : hold.field; \ 1232 if (q == NULL) \ 1233 pwd->field = NULL; \ 1234 else { \ 1235 pwd->field = p; \ 1236 if ((n = strlcpy(p, q, eob-p)) >= eob-p) { \ 1237 free(copy); \ 1238 return (ERANGE); \ 1239 } \ 1240 p += n + 1; \ 1241 } \ 1242 } while (0) 1243 COPY(pw_name, 0); 1244 #ifdef PW_OVERRIDE_PASSWD 1245 COPY(pw_passwd, _PWF_PASSWD); 1246 #else 1247 COPY(pw_passwd, 0); 1248 #endif 1249 COPY(pw_class, 0); 1250 COPY(pw_gecos, _PWF_GECOS); 1251 COPY(pw_dir, _PWF_DIR); 1252 COPY(pw_shell, _PWF_SHELL); 1253 #undef COPY 1254 #define COPY(field, flag) do { \ 1255 if (template->pw_fields & flag) \ 1256 pwd->field = template->field; \ 1257 } while (0) 1258 COPY(pw_uid, _PWF_UID); 1259 COPY(pw_gid, _PWF_GID); 1260 #undef COPY 1261 free(copy); 1262 return (0); 1263 } 1264 1265 1266 static int 1267 compat_exclude(const char *name, DB **db) 1268 { 1269 DBT key, data; 1270 1271 if (*db == NULL && 1272 (*db = dbopen(NULL, O_RDWR, 600, DB_HASH, 0)) == NULL) 1273 return (errno); 1274 key.size = strlen(name); 1275 key.data = (char *)name; 1276 data.size = 0; 1277 data.data = NULL; 1278 1279 if ((*db)->put(*db, &key, &data, 0) == -1) 1280 return (errno); 1281 return (0); 1282 } 1283 1284 1285 static int 1286 compat_is_excluded(const char *name, DB *db) 1287 { 1288 DBT key, data; 1289 1290 if (db == NULL) 1291 return (0); 1292 key.size = strlen(name); 1293 key.data = (char *)name; 1294 return (db->get(db, &key, &data, 0) == 0); 1295 } 1296 1297 1298 static int 1299 compat_redispatch(struct compat_state *st, enum nss_lookup_type how, 1300 enum nss_lookup_type lookup_how, const char *name, const char *lookup_name, 1301 uid_t uid, struct passwd *pwd, char *buffer, size_t bufsize, int *errnop) 1302 { 1303 static const ns_src compatsrc[] = { 1304 #ifdef YP 1305 { NSSRC_NIS, NS_SUCCESS }, 1306 #endif 1307 { NULL, 0 } 1308 }; 1309 ns_dtab dtab[] = { 1310 #ifdef YP 1311 { NSSRC_NIS, nis_passwd, NULL }, 1312 #endif 1313 #ifdef HESIOD 1314 { NSSRC_DNS, dns_passwd, NULL }, 1315 #endif 1316 { NULL, NULL, NULL } 1317 }; 1318 void *discard; 1319 int rv, e, i; 1320 1321 for (i = 0; i < sizeof(dtab)/sizeof(dtab[0]) - 1; i++) 1322 dtab[i].mdata = (void *)lookup_how; 1323 more: 1324 pwd_init(pwd); 1325 switch (lookup_how) { 1326 case nss_lt_all: 1327 rv = _nsdispatch(&discard, dtab, NSDB_PASSWD_COMPAT, 1328 "getpwent_r", compatsrc, pwd, buffer, bufsize, 1329 errnop); 1330 break; 1331 case nss_lt_id: 1332 rv = _nsdispatch(&discard, dtab, NSDB_PASSWD_COMPAT, 1333 "getpwuid_r", compatsrc, uid, pwd, buffer, 1334 bufsize, errnop); 1335 break; 1336 case nss_lt_name: 1337 rv = _nsdispatch(&discard, dtab, NSDB_PASSWD_COMPAT, 1338 "getpwnam_r", compatsrc, lookup_name, pwd, buffer, 1339 bufsize, errnop); 1340 break; 1341 default: 1342 return (NS_UNAVAIL); 1343 } 1344 if (rv != NS_SUCCESS) 1345 return (rv); 1346 if (compat_is_excluded(pwd->pw_name, st->exclude)) { 1347 if (how == nss_lt_all) 1348 goto more; 1349 return (NS_NOTFOUND); 1350 } 1351 e = compat_use_template(pwd, &st->template, buffer, bufsize); 1352 if (e != 0) { 1353 *errnop = e; 1354 if (e == ERANGE) 1355 return (NS_RETURN); 1356 else 1357 return (NS_UNAVAIL); 1358 } 1359 switch (how) { 1360 case nss_lt_name: 1361 if (strcmp(name, pwd->pw_name) != 0) 1362 return (NS_NOTFOUND); 1363 break; 1364 case nss_lt_id: 1365 if (uid != pwd->pw_uid) 1366 return (NS_NOTFOUND); 1367 break; 1368 default: 1369 break; 1370 } 1371 return (NS_SUCCESS); 1372 } 1373 1374 1375 static void 1376 compat_endstate(void *p) 1377 { 1378 struct compat_state *st; 1379 1380 if (p == NULL) 1381 return; 1382 st = (struct compat_state *)p; 1383 if (st->db != NULL) 1384 st->db->close(st->db); 1385 if (st->exclude != NULL) 1386 st->exclude->close(st->exclude); 1387 compat_clear_template(&st->template); 1388 free(p); 1389 } 1390 1391 1392 static int 1393 compat_setpwent(void *retval, void *mdata, va_list ap) 1394 { 1395 static const ns_src compatsrc[] = { 1396 #ifdef YP 1397 { NSSRC_NIS, NS_SUCCESS }, 1398 #endif 1399 { NULL, 0 } 1400 }; 1401 ns_dtab dtab[] = { 1402 #ifdef YP 1403 { NSSRC_NIS, nis_setpwent, NULL }, 1404 #endif 1405 #ifdef HESIOD 1406 { NSSRC_DNS, dns_setpwent, NULL }, 1407 #endif 1408 { NULL, NULL, NULL } 1409 }; 1410 struct compat_state *st; 1411 int rv, stayopen; 1412 1413 #define set_setent(x, y) do { \ 1414 int i; \ 1415 \ 1416 for (i = 0; i < (sizeof(x)/sizeof(x[0])) - 1; i++) \ 1417 x[i].mdata = (void *)y; \ 1418 } while (0) 1419 1420 rv = compat_getstate(&st); 1421 if (rv != 0) 1422 return (NS_UNAVAIL); 1423 switch ((enum constants)mdata) { 1424 case SETPWENT: 1425 stayopen = va_arg(ap, int); 1426 st->keynum = 0; 1427 if (stayopen) 1428 st->db = pwdbopen(&st->version); 1429 st->stayopen = stayopen; 1430 set_setent(dtab, mdata); 1431 (void)_nsdispatch(NULL, dtab, NSDB_PASSWD_COMPAT, "setpwent", 1432 compatsrc, 0); 1433 break; 1434 case ENDPWENT: 1435 if (st->db != NULL) { 1436 (void)st->db->close(st->db); 1437 st->db = NULL; 1438 } 1439 set_setent(dtab, mdata); 1440 (void)_nsdispatch(NULL, dtab, NSDB_PASSWD_COMPAT, "endpwent", 1441 compatsrc, 0); 1442 break; 1443 default: 1444 break; 1445 } 1446 return (NS_UNAVAIL); 1447 #undef set_setent 1448 } 1449 1450 1451 static int 1452 compat_passwd(void *retval, void *mdata, va_list ap) 1453 { 1454 char keybuf[MAXLOGNAME + 1]; 1455 DBT key, entry; 1456 struct compat_state *st; 1457 enum nss_lookup_type how; 1458 const char *name; 1459 struct passwd *pwd; 1460 char *buffer, *pw_name; 1461 char *host, *user, *domain; 1462 size_t bufsize; 1463 uid_t uid; 1464 uint32_t store; 1465 int rv, from_compat, stayopen, *errnop; 1466 1467 from_compat = 0; 1468 name = NULL; 1469 uid = (uid_t)-1; 1470 how = (enum nss_lookup_type)mdata; 1471 switch (how) { 1472 case nss_lt_name: 1473 name = va_arg(ap, const char *); 1474 break; 1475 case nss_lt_id: 1476 uid = va_arg(ap, uid_t); 1477 break; 1478 case nss_lt_all: 1479 break; 1480 default: 1481 rv = NS_NOTFOUND; 1482 goto fin; 1483 } 1484 pwd = va_arg(ap, struct passwd *); 1485 buffer = va_arg(ap, char *); 1486 bufsize = va_arg(ap, size_t); 1487 errnop = va_arg(ap, int *); 1488 *errnop = compat_getstate(&st); 1489 if (*errnop != 0) 1490 return (NS_UNAVAIL); 1491 if (how == nss_lt_all && st->keynum < 0) { 1492 rv = NS_NOTFOUND; 1493 goto fin; 1494 } 1495 if (st->db == NULL && 1496 (st->db = pwdbopen(&st->version)) == NULL) { 1497 *errnop = errno; 1498 rv = NS_UNAVAIL; 1499 goto fin; 1500 } 1501 if (how == nss_lt_all) { 1502 if (st->keynum < 0) { 1503 rv = NS_NOTFOUND; 1504 goto fin; 1505 } 1506 stayopen = 1; 1507 } else { 1508 st->keynum = 0; 1509 stayopen = st->stayopen; 1510 } 1511 docompat: 1512 rv = NS_NOTFOUND; 1513 switch (st->compat) { 1514 case COMPAT_MODE_ALL: 1515 rv = compat_redispatch(st, how, how, name, name, uid, pwd, 1516 buffer, bufsize, errnop); 1517 if (rv != NS_SUCCESS) 1518 st->compat = COMPAT_MODE_OFF; 1519 break; 1520 case COMPAT_MODE_NETGROUP: 1521 /* XXX getnetgrent is not thread-safe. */ 1522 do { 1523 rv = getnetgrent(&host, &user, &domain); 1524 if (rv == 0) { 1525 endnetgrent(); 1526 st->compat = COMPAT_MODE_OFF; 1527 rv = NS_NOTFOUND; 1528 continue; 1529 } else if (user == NULL || user[0] == '\0') 1530 continue; 1531 rv = compat_redispatch(st, how, nss_lt_name, name, 1532 user, uid, pwd, buffer, bufsize, errnop); 1533 } while (st->compat == COMPAT_MODE_NETGROUP && 1534 !(rv & NS_TERMINATE)); 1535 break; 1536 case COMPAT_MODE_NAME: 1537 rv = compat_redispatch(st, how, nss_lt_name, name, st->name, 1538 uid, pwd, buffer, bufsize, errnop); 1539 free(st->name); 1540 st->name = NULL; 1541 st->compat = COMPAT_MODE_OFF; 1542 break; 1543 default: 1544 break; 1545 } 1546 if (rv & NS_TERMINATE) { 1547 from_compat = 1; 1548 goto fin; 1549 } 1550 key.data = keybuf; 1551 rv = NS_NOTFOUND; 1552 while (st->keynum >= 0) { 1553 st->keynum++; 1554 if (st->version < _PWD_CURRENT_VERSION) { 1555 memcpy(&keybuf[1], &st->keynum, sizeof(st->keynum)); 1556 key.size = sizeof(st->keynum) + 1; 1557 } else { 1558 store = htonl(st->keynum); 1559 memcpy(&keybuf[1], &store, sizeof(store)); 1560 key.size = sizeof(store) + 1; 1561 } 1562 keybuf[0] = _PW_VERSIONED(_PW_KEYBYNUM, st->version); 1563 rv = st->db->get(st->db, &key, &entry, 0); 1564 if (rv < 0 || rv > 1) { /* should never return > 1 */ 1565 *errnop = errno; 1566 rv = NS_UNAVAIL; 1567 goto fin; 1568 } else if (rv == 1) { 1569 st->keynum = -1; 1570 rv = NS_NOTFOUND; 1571 goto fin; 1572 } 1573 pw_name = (char *)entry.data; 1574 switch (pw_name[0]) { 1575 case '+': 1576 switch (pw_name[1]) { 1577 case '\0': 1578 st->compat = COMPAT_MODE_ALL; 1579 break; 1580 case '@': 1581 setnetgrent(&pw_name[2]); 1582 st->compat = COMPAT_MODE_NETGROUP; 1583 break; 1584 default: 1585 st->name = strdup(&pw_name[1]); 1586 if (st->name == NULL) { 1587 syslog(LOG_ERR, 1588 "getpwent memory allocation failure"); 1589 *errnop = ENOMEM; 1590 rv = NS_UNAVAIL; 1591 break; 1592 } 1593 st->compat = COMPAT_MODE_NAME; 1594 } 1595 if (entry.size > bufsize) { 1596 *errnop = ERANGE; 1597 rv = NS_RETURN; 1598 goto fin; 1599 } 1600 memcpy(buffer, entry.data, entry.size); 1601 rv = pwdb_versions[st->version].parse(buffer, 1602 entry.size, pwd, errnop); 1603 if (rv != NS_SUCCESS) 1604 ; 1605 else if (compat_set_template(pwd, &st->template) < 0) { 1606 *errnop = ENOMEM; 1607 rv = NS_UNAVAIL; 1608 goto fin; 1609 } 1610 goto docompat; 1611 case '-': 1612 switch (pw_name[1]) { 1613 case '\0': 1614 /* XXX Maybe syslog warning */ 1615 continue; 1616 case '@': 1617 setnetgrent(&pw_name[2]); 1618 while (getnetgrent(&host, &user, &domain) != 1619 NULL) { 1620 if (user != NULL && user[0] != '\0') 1621 compat_exclude(user, 1622 &st->exclude); 1623 } 1624 endnetgrent(); 1625 continue; 1626 default: 1627 compat_exclude(&pw_name[1], &st->exclude); 1628 continue; 1629 } 1630 break; 1631 default: 1632 break; 1633 } 1634 if (compat_is_excluded((char *)entry.data, st->exclude)) 1635 continue; 1636 rv = pwdb_versions[st->version].match(entry.data, entry.size, 1637 how, name, uid); 1638 if (rv == NS_RETURN) 1639 break; 1640 else if (rv != NS_SUCCESS) 1641 continue; 1642 if (entry.size > bufsize) { 1643 *errnop = ERANGE; 1644 rv = NS_RETURN; 1645 break; 1646 } 1647 memcpy(buffer, entry.data, entry.size); 1648 rv = pwdb_versions[st->version].parse(buffer, entry.size, pwd, 1649 errnop); 1650 if (rv & NS_TERMINATE) 1651 break; 1652 } 1653 fin: 1654 if (!stayopen && st->db != NULL) { 1655 (void)st->db->close(st->db); 1656 st->db = NULL; 1657 } 1658 if (rv == NS_SUCCESS) { 1659 if (!from_compat) { 1660 pwd->pw_fields &= ~_PWF_SOURCE; 1661 pwd->pw_fields |= _PWF_FILES; 1662 } 1663 if (retval != NULL) 1664 *(struct passwd **)retval = pwd; 1665 } 1666 return (rv); 1667 } 1668 1669 1670 /* 1671 * common passwd line matching and parsing 1672 */ 1673 int 1674 __pw_match_entry(const char *entry, size_t entrysize, enum nss_lookup_type how, 1675 const char *name, uid_t uid) 1676 { 1677 const char *p, *eom; 1678 char *q; 1679 size_t len; 1680 unsigned long m; 1681 1682 eom = entry + entrysize; 1683 for (p = entry; p < eom; p++) 1684 if (*p == ':') 1685 break; 1686 if (*p != ':') 1687 return (NS_NOTFOUND); 1688 if (how == nss_lt_all) 1689 return (NS_SUCCESS); 1690 if (how == nss_lt_name) { 1691 len = strlen(name); 1692 if (len == (p - entry) && memcmp(name, entry, len) == 0) 1693 return (NS_SUCCESS); 1694 else 1695 return (NS_NOTFOUND); 1696 } 1697 for (p++; p < eom; p++) 1698 if (*p == ':') 1699 break; 1700 if (*p != ':') 1701 return (NS_NOTFOUND); 1702 m = strtoul(++p, &q, 10); 1703 if (q[0] != ':' || (uid_t)m != uid) 1704 return (NS_NOTFOUND); 1705 else 1706 return (NS_SUCCESS); 1707 } 1708 1709 1710 /* XXX buffer must be NUL-terminated. errnop is not set correctly. */ 1711 int 1712 __pw_parse_entry(char *buffer, size_t bufsize __unused, struct passwd *pwd, 1713 int master, int *errnop __unused) 1714 { 1715 1716 if (__pw_scan(buffer, pwd, master ? _PWSCAN_MASTER : 0) == 0) 1717 return (NS_NOTFOUND); 1718 else 1719 return (NS_SUCCESS); 1720 } 1721