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; 942 char *outname; 943 944 *master = 0; 945 if (geteuid() == 0) { 946 if (snprintf(buffer, bufsize, "master.passwd.by%s", 947 (how == nss_lt_id) ? "uid" : "name") >= bufsize) 948 return (NS_UNAVAIL); 949 rv = yp_master(domain, buffer, &outname); 950 if (rv == 0) { 951 *master = 1; 952 return (NS_SUCCESS); 953 } 954 } 955 if (snprintf(buffer, bufsize, "passwd.by%s", 956 (how == nss_lt_id) ? "uid" : "name") >= bufsize) 957 return (NS_UNAVAIL); 958 rv = yp_master(domain, buffer, &outname); 959 if (rv == 0) 960 return (NS_SUCCESS); 961 return (NS_UNAVAIL); 962 } 963 964 965 static int 966 nis_adjunct(char *domain, const char *name, char *buffer, size_t bufsize) 967 { 968 int rv; 969 char *result, *p, *q, *eor; 970 int resultlen; 971 972 result = NULL; 973 rv = yp_match(domain, "passwd.adjunct.byname", name, strlen(name), 974 &result, &resultlen); 975 if (rv != 0) 976 rv = 1; 977 else { 978 eor = &result[resultlen]; 979 p = memchr(result, ':', eor - result); 980 if (p != NULL && ++p < eor && 981 (q = memchr(p, ':', eor - p)) != NULL) { 982 if (q - p >= bufsize) 983 rv = -1; 984 else { 985 memcpy(buffer, p, q - p); 986 buffer[q - p] ='\0'; 987 } 988 } else 989 rv = 1; 990 } 991 free(result); 992 return (rv); 993 } 994 995 996 static int 997 nis_setpwent(void *retval, void *mdata, va_list ap) 998 { 999 struct nis_state *st; 1000 int rv; 1001 1002 rv = nis_getstate(&st); 1003 if (rv != 0) 1004 return (NS_UNAVAIL); 1005 st->done = 0; 1006 free(st->key); 1007 st->key = NULL; 1008 return (NS_UNAVAIL); 1009 } 1010 1011 1012 static int 1013 nis_passwd(void *retval, void *mdata, va_list ap) 1014 { 1015 char map[YPMAXMAP]; 1016 struct nis_state *st; 1017 struct passwd *pwd; 1018 const char *name; 1019 char *buffer, *key, *result; 1020 size_t bufsize; 1021 uid_t uid; 1022 enum nss_lookup_type how; 1023 int *errnop, keylen, resultlen, rv, master; 1024 1025 name = NULL; 1026 uid = (uid_t)-1; 1027 how = (enum nss_lookup_type)mdata; 1028 switch (how) { 1029 case nss_lt_name: 1030 name = va_arg(ap, const char *); 1031 break; 1032 case nss_lt_id: 1033 uid = va_arg(ap, uid_t); 1034 break; 1035 case nss_lt_all: 1036 break; 1037 } 1038 pwd = va_arg(ap, struct passwd *); 1039 buffer = va_arg(ap, char *); 1040 bufsize = va_arg(ap, size_t); 1041 errnop = va_arg(ap, int *); 1042 *errnop = nis_getstate(&st); 1043 if (*errnop != 0) 1044 return (NS_UNAVAIL); 1045 if (st->domain[0] == '\0') { 1046 if (getdomainname(st->domain, sizeof(st->domain)) != 0) { 1047 *errnop = errno; 1048 return (NS_UNAVAIL); 1049 } 1050 } 1051 rv = nis_map(st->domain, how, map, sizeof(map), &master); 1052 if (rv != NS_SUCCESS) 1053 return (rv); 1054 result = NULL; 1055 do { 1056 rv = NS_NOTFOUND; 1057 switch (how) { 1058 case nss_lt_name: 1059 if (strlcpy(buffer, name, bufsize) >= bufsize) 1060 goto erange; 1061 break; 1062 case nss_lt_id: 1063 if (snprintf(buffer, bufsize, "%lu", 1064 (unsigned long)uid) >= bufsize) 1065 goto erange; 1066 break; 1067 case nss_lt_all: 1068 if (st->done) 1069 goto fin; 1070 break; 1071 } 1072 result = NULL; 1073 if (how == nss_lt_all) { 1074 if (st->key == NULL) 1075 rv = yp_first(st->domain, map, &st->key, 1076 &st->keylen, &result, &resultlen); 1077 else { 1078 key = st->key; 1079 keylen = st->keylen; 1080 st->key = NULL; 1081 rv = yp_next(st->domain, map, key, keylen, 1082 &st->key, &st->keylen, &result, 1083 &resultlen); 1084 free(key); 1085 } 1086 if (rv != 0) { 1087 free(result); 1088 free(st->key); 1089 st->key = NULL; 1090 if (rv == YPERR_NOMORE) 1091 st->done = 1; 1092 else 1093 rv = NS_UNAVAIL; 1094 goto fin; 1095 } 1096 } else { 1097 rv = yp_match(st->domain, map, buffer, strlen(buffer), 1098 &result, &resultlen); 1099 if (rv == YPERR_KEY) { 1100 rv = NS_NOTFOUND; 1101 continue; 1102 } else if (rv != 0) { 1103 free(result); 1104 rv = NS_UNAVAIL; 1105 continue; 1106 } 1107 } 1108 if (resultlen >= bufsize) 1109 goto erange; 1110 memcpy(buffer, result, resultlen); 1111 buffer[resultlen] = '\0'; 1112 free(result); 1113 rv = __pw_match_entry(buffer, resultlen, how, name, uid); 1114 if (rv == NS_SUCCESS) 1115 rv = __pw_parse_entry(buffer, resultlen, pwd, master, 1116 errnop); 1117 } while (how == nss_lt_all && !(rv & NS_TERMINATE)); 1118 fin: 1119 if (rv == NS_SUCCESS) { 1120 if (strstr(pwd->pw_passwd, "##") != NULL) { 1121 rv = nis_adjunct(st->domain, name, 1122 &buffer[resultlen+1], bufsize-resultlen-1); 1123 if (rv < 0) 1124 goto erange; 1125 else if (rv == 0) 1126 pwd->pw_passwd = &buffer[resultlen+1]; 1127 } 1128 pwd->pw_fields &= ~_PWF_SOURCE; 1129 pwd->pw_fields |= _PWF_NIS; 1130 if (retval != NULL) 1131 *(struct passwd **)retval = pwd; 1132 } 1133 return (rv); 1134 erange: 1135 *errnop = ERANGE; 1136 return (NS_RETURN); 1137 } 1138 #endif /* YP */ 1139 1140 1141 /* 1142 * compat backend 1143 */ 1144 static void 1145 compat_clear_template(struct passwd *template) 1146 { 1147 1148 free(template->pw_passwd); 1149 free(template->pw_gecos); 1150 free(template->pw_dir); 1151 free(template->pw_shell); 1152 memset(template, 0, sizeof(*template)); 1153 } 1154 1155 1156 static int 1157 compat_set_template(struct passwd *src, struct passwd *template) 1158 { 1159 1160 compat_clear_template(template); 1161 #ifdef PW_OVERRIDE_PASSWD 1162 if ((src->pw_fields & _PWF_PASSWD) && 1163 (template->pw_passwd = strdup(src->pw_passwd)) == NULL) 1164 goto enomem; 1165 #endif 1166 if (src->pw_fields & _PWF_UID) 1167 template->pw_uid = src->pw_uid; 1168 if (src->pw_fields & _PWF_GID) 1169 template->pw_gid = src->pw_gid; 1170 if ((src->pw_fields & _PWF_GECOS) && 1171 (template->pw_gecos = strdup(src->pw_gecos)) == NULL) 1172 goto enomem; 1173 if ((src->pw_fields & _PWF_DIR) && 1174 (template->pw_dir = strdup(src->pw_dir)) == NULL) 1175 goto enomem; 1176 if ((src->pw_fields & _PWF_SHELL) && 1177 (template->pw_shell = strdup(src->pw_shell)) == NULL) 1178 goto enomem; 1179 template->pw_fields = src->pw_fields; 1180 return (0); 1181 enomem: 1182 syslog(LOG_ERR, "getpwent memory allocation failure"); 1183 return (-1); 1184 } 1185 1186 1187 static int 1188 compat_use_template(struct passwd *pwd, struct passwd *template, char *buffer, 1189 size_t bufsize) 1190 { 1191 struct passwd hold; 1192 char *copy, *p, *q, *eob; 1193 size_t n; 1194 1195 /* We cannot know the layout of the password fields in `buffer', 1196 * so we have to copy everything. 1197 */ 1198 if (template->pw_fields == 0) /* nothing to fill-in */ 1199 return (0); 1200 n = 0; 1201 n += pwd->pw_name != NULL ? strlen(pwd->pw_name) + 1 : 0; 1202 n += pwd->pw_passwd != NULL ? strlen(pwd->pw_passwd) + 1 : 0; 1203 n += pwd->pw_class != NULL ? strlen(pwd->pw_class) + 1 : 0; 1204 n += pwd->pw_gecos != NULL ? strlen(pwd->pw_gecos) + 1 : 0; 1205 n += pwd->pw_dir != NULL ? strlen(pwd->pw_dir) + 1 : 0; 1206 n += pwd->pw_shell != NULL ? strlen(pwd->pw_shell) + 1 : 0; 1207 copy = malloc(n); 1208 if (copy == NULL) { 1209 syslog(LOG_ERR, "getpwent memory allocation failure"); 1210 return (ENOMEM); 1211 } 1212 p = copy; 1213 eob = ©[n]; 1214 #define COPY(field) do { \ 1215 if (pwd->field == NULL) \ 1216 hold.field = NULL; \ 1217 else { \ 1218 hold.field = p; \ 1219 p += strlcpy(p, pwd->field, eob-p) + 1; \ 1220 } \ 1221 } while (0) 1222 COPY(pw_name); 1223 COPY(pw_passwd); 1224 COPY(pw_class); 1225 COPY(pw_gecos); 1226 COPY(pw_dir); 1227 COPY(pw_shell); 1228 #undef COPY 1229 p = buffer; 1230 eob = &buffer[bufsize]; 1231 #define COPY(field, flag) do { \ 1232 q = (template->pw_fields & flag) ? template->field : hold.field; \ 1233 if (q == NULL) \ 1234 pwd->field = NULL; \ 1235 else { \ 1236 pwd->field = p; \ 1237 if ((n = strlcpy(p, q, eob-p)) >= eob-p) { \ 1238 free(copy); \ 1239 return (ERANGE); \ 1240 } \ 1241 p += n + 1; \ 1242 } \ 1243 } while (0) 1244 COPY(pw_name, 0); 1245 #ifdef PW_OVERRIDE_PASSWD 1246 COPY(pw_passwd, _PWF_PASSWD); 1247 #else 1248 COPY(pw_passwd, 0); 1249 #endif 1250 COPY(pw_class, 0); 1251 COPY(pw_gecos, _PWF_GECOS); 1252 COPY(pw_dir, _PWF_DIR); 1253 COPY(pw_shell, _PWF_SHELL); 1254 #undef COPY 1255 #define COPY(field, flag) do { \ 1256 if (template->pw_fields & flag) \ 1257 pwd->field = template->field; \ 1258 } while (0) 1259 COPY(pw_uid, _PWF_UID); 1260 COPY(pw_gid, _PWF_GID); 1261 #undef COPY 1262 free(copy); 1263 return (0); 1264 } 1265 1266 1267 static int 1268 compat_exclude(const char *name, DB **db) 1269 { 1270 DBT key, data; 1271 1272 if (*db == NULL && 1273 (*db = dbopen(NULL, O_RDWR, 600, DB_HASH, 0)) == NULL) 1274 return (errno); 1275 key.size = strlen(name); 1276 key.data = (char *)name; 1277 data.size = 0; 1278 data.data = NULL; 1279 1280 if ((*db)->put(*db, &key, &data, 0) == -1) 1281 return (errno); 1282 return (0); 1283 } 1284 1285 1286 static int 1287 compat_is_excluded(const char *name, DB *db) 1288 { 1289 DBT key, data; 1290 1291 if (db == NULL) 1292 return (0); 1293 key.size = strlen(name); 1294 key.data = (char *)name; 1295 return (db->get(db, &key, &data, 0) == 0); 1296 } 1297 1298 1299 static int 1300 compat_redispatch(struct compat_state *st, enum nss_lookup_type how, 1301 enum nss_lookup_type lookup_how, const char *name, const char *lookup_name, 1302 uid_t uid, struct passwd *pwd, char *buffer, size_t bufsize, int *errnop) 1303 { 1304 static const ns_src compatsrc[] = { 1305 #ifdef YP 1306 { NSSRC_NIS, NS_SUCCESS }, 1307 #endif 1308 { NULL, 0 } 1309 }; 1310 ns_dtab dtab[] = { 1311 #ifdef YP 1312 { NSSRC_NIS, nis_passwd, NULL }, 1313 #endif 1314 #ifdef HESIOD 1315 { NSSRC_DNS, dns_passwd, NULL }, 1316 #endif 1317 { NULL, NULL, NULL } 1318 }; 1319 void *discard; 1320 int rv, e, i; 1321 1322 for (i = 0; i < sizeof(dtab)/sizeof(dtab[0]) - 1; i++) 1323 dtab[i].mdata = (void *)lookup_how; 1324 more: 1325 pwd_init(pwd); 1326 switch (lookup_how) { 1327 case nss_lt_all: 1328 rv = _nsdispatch(&discard, dtab, NSDB_PASSWD_COMPAT, 1329 "getpwent_r", compatsrc, pwd, buffer, bufsize, 1330 errnop); 1331 break; 1332 case nss_lt_id: 1333 rv = _nsdispatch(&discard, dtab, NSDB_PASSWD_COMPAT, 1334 "getpwuid_r", compatsrc, uid, pwd, buffer, 1335 bufsize, errnop); 1336 break; 1337 case nss_lt_name: 1338 rv = _nsdispatch(&discard, dtab, NSDB_PASSWD_COMPAT, 1339 "getpwnam_r", compatsrc, lookup_name, pwd, buffer, 1340 bufsize, errnop); 1341 break; 1342 default: 1343 return (NS_UNAVAIL); 1344 } 1345 if (rv != NS_SUCCESS) 1346 return (rv); 1347 if (compat_is_excluded(pwd->pw_name, st->exclude)) { 1348 if (how == nss_lt_all) 1349 goto more; 1350 return (NS_NOTFOUND); 1351 } 1352 e = compat_use_template(pwd, &st->template, buffer, bufsize); 1353 if (e != 0) { 1354 *errnop = e; 1355 if (e == ERANGE) 1356 return (NS_RETURN); 1357 else 1358 return (NS_UNAVAIL); 1359 } 1360 switch (how) { 1361 case nss_lt_name: 1362 if (strcmp(name, pwd->pw_name) != 0) 1363 return (NS_NOTFOUND); 1364 break; 1365 case nss_lt_id: 1366 if (uid != pwd->pw_uid) 1367 return (NS_NOTFOUND); 1368 break; 1369 default: 1370 break; 1371 } 1372 return (NS_SUCCESS); 1373 } 1374 1375 1376 static void 1377 compat_endstate(void *p) 1378 { 1379 struct compat_state *st; 1380 1381 if (p == NULL) 1382 return; 1383 st = (struct compat_state *)p; 1384 if (st->db != NULL) 1385 st->db->close(st->db); 1386 if (st->exclude != NULL) 1387 st->exclude->close(st->exclude); 1388 compat_clear_template(&st->template); 1389 free(p); 1390 } 1391 1392 1393 static int 1394 compat_setpwent(void *retval, void *mdata, va_list ap) 1395 { 1396 static const ns_src compatsrc[] = { 1397 #ifdef YP 1398 { NSSRC_NIS, NS_SUCCESS }, 1399 #endif 1400 { NULL, 0 } 1401 }; 1402 ns_dtab dtab[] = { 1403 #ifdef YP 1404 { NSSRC_NIS, nis_setpwent, NULL }, 1405 #endif 1406 #ifdef HESIOD 1407 { NSSRC_DNS, dns_setpwent, NULL }, 1408 #endif 1409 { NULL, NULL, NULL } 1410 }; 1411 struct compat_state *st; 1412 int rv, stayopen; 1413 1414 #define set_setent(x, y) do { \ 1415 int i; \ 1416 \ 1417 for (i = 0; i < (sizeof(x)/sizeof(x[0])) - 1; i++) \ 1418 x[i].mdata = (void *)y; \ 1419 } while (0) 1420 1421 rv = compat_getstate(&st); 1422 if (rv != 0) 1423 return (NS_UNAVAIL); 1424 switch ((enum constants)mdata) { 1425 case SETPWENT: 1426 stayopen = va_arg(ap, int); 1427 st->keynum = 0; 1428 if (stayopen) 1429 st->db = pwdbopen(&st->version); 1430 st->stayopen = stayopen; 1431 set_setent(dtab, mdata); 1432 (void)_nsdispatch(NULL, dtab, NSDB_PASSWD_COMPAT, "setpwent", 1433 compatsrc, 0); 1434 break; 1435 case ENDPWENT: 1436 if (st->db != NULL) { 1437 (void)st->db->close(st->db); 1438 st->db = NULL; 1439 } 1440 set_setent(dtab, mdata); 1441 (void)_nsdispatch(NULL, dtab, NSDB_PASSWD_COMPAT, "endpwent", 1442 compatsrc, 0); 1443 break; 1444 default: 1445 break; 1446 } 1447 return (NS_UNAVAIL); 1448 #undef set_setent 1449 } 1450 1451 1452 static int 1453 compat_passwd(void *retval, void *mdata, va_list ap) 1454 { 1455 char keybuf[MAXLOGNAME + 1]; 1456 DBT key, entry; 1457 struct compat_state *st; 1458 enum nss_lookup_type how; 1459 const char *name; 1460 struct passwd *pwd; 1461 char *buffer, *pw_name; 1462 char *host, *user, *domain; 1463 size_t bufsize; 1464 uid_t uid; 1465 uint32_t store; 1466 int rv, from_compat, stayopen, *errnop; 1467 1468 from_compat = 0; 1469 name = NULL; 1470 uid = (uid_t)-1; 1471 how = (enum nss_lookup_type)mdata; 1472 switch (how) { 1473 case nss_lt_name: 1474 name = va_arg(ap, const char *); 1475 break; 1476 case nss_lt_id: 1477 uid = va_arg(ap, uid_t); 1478 break; 1479 case nss_lt_all: 1480 break; 1481 default: 1482 rv = NS_NOTFOUND; 1483 goto fin; 1484 } 1485 pwd = va_arg(ap, struct passwd *); 1486 buffer = va_arg(ap, char *); 1487 bufsize = va_arg(ap, size_t); 1488 errnop = va_arg(ap, int *); 1489 *errnop = compat_getstate(&st); 1490 if (*errnop != 0) 1491 return (NS_UNAVAIL); 1492 if (how == nss_lt_all && st->keynum < 0) { 1493 rv = NS_NOTFOUND; 1494 goto fin; 1495 } 1496 if (st->db == NULL && 1497 (st->db = pwdbopen(&st->version)) == NULL) { 1498 *errnop = errno; 1499 rv = NS_UNAVAIL; 1500 goto fin; 1501 } 1502 if (how == nss_lt_all) { 1503 if (st->keynum < 0) { 1504 rv = NS_NOTFOUND; 1505 goto fin; 1506 } 1507 stayopen = 1; 1508 } else { 1509 st->keynum = 0; 1510 stayopen = st->stayopen; 1511 } 1512 docompat: 1513 rv = NS_NOTFOUND; 1514 switch (st->compat) { 1515 case COMPAT_MODE_ALL: 1516 rv = compat_redispatch(st, how, how, name, name, uid, pwd, 1517 buffer, bufsize, errnop); 1518 if (rv != NS_SUCCESS) 1519 st->compat = COMPAT_MODE_OFF; 1520 break; 1521 case COMPAT_MODE_NETGROUP: 1522 /* XXX getnetgrent is not thread-safe. */ 1523 do { 1524 rv = getnetgrent(&host, &user, &domain); 1525 if (rv == 0) { 1526 endnetgrent(); 1527 st->compat = COMPAT_MODE_OFF; 1528 rv = NS_NOTFOUND; 1529 continue; 1530 } else if (user == NULL || user[0] == '\0') 1531 continue; 1532 rv = compat_redispatch(st, how, nss_lt_name, name, 1533 user, uid, pwd, buffer, bufsize, errnop); 1534 } while (st->compat == COMPAT_MODE_NETGROUP && 1535 !(rv & NS_TERMINATE)); 1536 break; 1537 case COMPAT_MODE_NAME: 1538 rv = compat_redispatch(st, how, nss_lt_name, name, st->name, 1539 uid, pwd, buffer, bufsize, errnop); 1540 free(st->name); 1541 st->name = NULL; 1542 st->compat = COMPAT_MODE_OFF; 1543 break; 1544 default: 1545 break; 1546 } 1547 if (rv & NS_TERMINATE) { 1548 from_compat = 1; 1549 goto fin; 1550 } 1551 key.data = keybuf; 1552 rv = NS_NOTFOUND; 1553 while (st->keynum >= 0) { 1554 st->keynum++; 1555 if (st->version < _PWD_CURRENT_VERSION) { 1556 memcpy(&keybuf[1], &st->keynum, sizeof(st->keynum)); 1557 key.size = sizeof(st->keynum) + 1; 1558 } else { 1559 store = htonl(st->keynum); 1560 memcpy(&keybuf[1], &store, sizeof(store)); 1561 key.size = sizeof(store) + 1; 1562 } 1563 keybuf[0] = _PW_VERSIONED(_PW_KEYBYNUM, st->version); 1564 rv = st->db->get(st->db, &key, &entry, 0); 1565 if (rv < 0 || rv > 1) { /* should never return > 1 */ 1566 *errnop = errno; 1567 rv = NS_UNAVAIL; 1568 goto fin; 1569 } else if (rv == 1) { 1570 st->keynum = -1; 1571 rv = NS_NOTFOUND; 1572 goto fin; 1573 } 1574 pw_name = (char *)entry.data; 1575 switch (pw_name[0]) { 1576 case '+': 1577 switch (pw_name[1]) { 1578 case '\0': 1579 st->compat = COMPAT_MODE_ALL; 1580 break; 1581 case '@': 1582 setnetgrent(&pw_name[2]); 1583 st->compat = COMPAT_MODE_NETGROUP; 1584 break; 1585 default: 1586 st->name = strdup(&pw_name[1]); 1587 if (st->name == NULL) { 1588 syslog(LOG_ERR, 1589 "getpwent memory allocation failure"); 1590 *errnop = ENOMEM; 1591 rv = NS_UNAVAIL; 1592 break; 1593 } 1594 st->compat = COMPAT_MODE_NAME; 1595 } 1596 if (entry.size > bufsize) { 1597 *errnop = ERANGE; 1598 rv = NS_RETURN; 1599 goto fin; 1600 } 1601 memcpy(buffer, entry.data, entry.size); 1602 rv = pwdb_versions[st->version].parse(buffer, 1603 entry.size, pwd, errnop); 1604 if (rv != NS_SUCCESS) 1605 ; 1606 else if (compat_set_template(pwd, &st->template) < 0) { 1607 *errnop = ENOMEM; 1608 rv = NS_UNAVAIL; 1609 goto fin; 1610 } 1611 goto docompat; 1612 case '-': 1613 switch (pw_name[1]) { 1614 case '\0': 1615 /* XXX Maybe syslog warning */ 1616 continue; 1617 case '@': 1618 setnetgrent(&pw_name[2]); 1619 while (getnetgrent(&host, &user, &domain) != 1620 NULL) { 1621 if (user != NULL && user[0] != '\0') 1622 compat_exclude(user, 1623 &st->exclude); 1624 } 1625 endnetgrent(); 1626 continue; 1627 default: 1628 compat_exclude(&pw_name[1], &st->exclude); 1629 continue; 1630 } 1631 break; 1632 default: 1633 break; 1634 } 1635 if (compat_is_excluded((char *)entry.data, st->exclude)) 1636 continue; 1637 rv = pwdb_versions[st->version].match(entry.data, entry.size, 1638 how, name, uid); 1639 if (rv == NS_RETURN) 1640 break; 1641 else if (rv != NS_SUCCESS) 1642 continue; 1643 if (entry.size > bufsize) { 1644 *errnop = ERANGE; 1645 rv = NS_RETURN; 1646 break; 1647 } 1648 memcpy(buffer, entry.data, entry.size); 1649 rv = pwdb_versions[st->version].parse(buffer, entry.size, pwd, 1650 errnop); 1651 if (rv & NS_TERMINATE) 1652 break; 1653 } 1654 fin: 1655 if (!stayopen && st->db != NULL) { 1656 (void)st->db->close(st->db); 1657 st->db = NULL; 1658 } 1659 if (rv == NS_SUCCESS) { 1660 if (!from_compat) { 1661 pwd->pw_fields &= ~_PWF_SOURCE; 1662 pwd->pw_fields |= _PWF_FILES; 1663 } 1664 if (retval != NULL) 1665 *(struct passwd **)retval = pwd; 1666 } 1667 return (rv); 1668 } 1669 1670 1671 /* 1672 * common passwd line matching and parsing 1673 */ 1674 int 1675 __pw_match_entry(const char *entry, size_t entrysize, enum nss_lookup_type how, 1676 const char *name, uid_t uid) 1677 { 1678 const char *p, *eom; 1679 char *q; 1680 size_t len; 1681 unsigned long m; 1682 1683 eom = entry + entrysize; 1684 for (p = entry; p < eom; p++) 1685 if (*p == ':') 1686 break; 1687 if (*p != ':') 1688 return (NS_NOTFOUND); 1689 if (how == nss_lt_all) 1690 return (NS_SUCCESS); 1691 if (how == nss_lt_name) { 1692 len = strlen(name); 1693 if (len == (p - entry) && memcmp(name, entry, len) == 0) 1694 return (NS_SUCCESS); 1695 else 1696 return (NS_NOTFOUND); 1697 } 1698 for (p++; p < eom; p++) 1699 if (*p == ':') 1700 break; 1701 if (*p != ':') 1702 return (NS_NOTFOUND); 1703 m = strtoul(++p, &q, 10); 1704 if (q[0] != ':' || (uid_t)m != uid) 1705 return (NS_NOTFOUND); 1706 else 1707 return (NS_SUCCESS); 1708 } 1709 1710 1711 /* XXX buffer must be NUL-terminated. errnop is not set correctly. */ 1712 int 1713 __pw_parse_entry(char *buffer, size_t bufsize __unused, struct passwd *pwd, 1714 int master, int *errnop __unused) 1715 { 1716 1717 if (__pw_scan(buffer, pwd, master ? _PWSCAN_MASTER : 0) == 0) 1718 return (NS_NOTFOUND); 1719 else 1720 return (NS_SUCCESS); 1721 } 1722