getpwent.c revision 126643
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: head/lib/libc/gen/getpwent.c 126643 2004-03-05 08:10:19Z markm $"); 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 */ 72typedef int pwkeynum; 73 74CTASSERT(MAXLOGNAME > sizeof(uid_t)); 75CTASSERT(MAXLOGNAME > sizeof(pwkeynum)); 76 77enum 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 85static const ns_src defaultsrc[] = { 86 { NSSRC_COMPAT, NS_SUCCESS }, 87 { NULL, 0 } 88}; 89 90int __pw_match_entry(const char *, size_t, enum nss_lookup_type, 91 const char *, uid_t); 92int __pw_parse_entry(char *, size_t, struct passwd *, int, int *errnop); 93 94static void pwd_init(struct passwd *); 95 96union key { 97 const char *name; 98 uid_t uid; 99}; 100 101static struct passwd *getpw(int (*fn)(union key, struct passwd *, char *, 102 size_t, struct passwd **), union key); 103static int wrap_getpwnam_r(union key, struct passwd *, char *, 104 size_t, struct passwd **); 105static int wrap_getpwuid_r(union key, struct passwd *, char *, size_t, 106 struct passwd **); 107static int wrap_getpwent_r(union key, struct passwd *, char *, size_t, 108 struct passwd **); 109 110static int pwdb_match_entry_v3(char *, size_t, enum nss_lookup_type, 111 const char *, uid_t); 112static int pwdb_parse_entry_v3(char *, size_t, struct passwd *, int *); 113static int pwdb_match_entry_v4(char *, size_t, enum nss_lookup_type, 114 const char *, uid_t); 115static int pwdb_parse_entry_v4(char *, size_t, struct passwd *, int *); 116 117 118struct { 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 131struct files_state { 132 DB *db; 133 pwkeynum keynum; 134 int stayopen; 135 int version; 136}; 137static void files_endstate(void *); 138NSS_TLS_HANDLING(files); 139static DB *pwdbopen(int *); 140static void files_endstate(void *); 141static int files_setpwent(void *, void *, va_list); 142static int files_passwd(void *, void *, va_list); 143 144 145#ifdef HESIOD 146struct dns_state { 147 long counter; 148}; 149static void dns_endstate(void *); 150NSS_TLS_HANDLING(dns); 151static int dns_setpwent(void *, void *, va_list); 152static int dns_passwd(void *, void *, va_list); 153#endif 154 155 156#ifdef YP 157struct nis_state { 158 char domain[MAXHOSTNAMELEN]; 159 int done; 160 char *key; 161 int keylen; 162}; 163static void nis_endstate(void *); 164NSS_TLS_HANDLING(nis); 165static int nis_setpwent(void *, void *, va_list); 166static int nis_passwd(void *, void *, va_list); 167static int nis_map(char *, enum nss_lookup_type, char *, size_t, int *); 168static int nis_adjunct(char *, const char *, char *, size_t); 169#endif 170 171 172struct 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}; 187static void compat_endstate(void *); 188NSS_TLS_HANDLING(compat); 189static int compat_setpwent(void *, void *, va_list); 190static int compat_passwd(void *, void *, va_list); 191static void compat_clear_template(struct passwd *); 192static int compat_set_template(struct passwd *, struct passwd *); 193static int compat_use_template(struct passwd *, struct passwd *, char *, 194 size_t); 195static 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 *); 198void 199setpwent(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 216int 217setpassent(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 236void 237endpwent(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 254int 255getpwent_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 283int 284getpwnam_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 312int 313getpwuid_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 341static void 342pwd_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 358static struct passwd pwd; 359static char *pwd_storage; 360static size_t pwd_storage_size; 361 362 363static struct passwd * 364getpw(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 394static int 395wrap_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 402static int 403wrap_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 410static int 411wrap_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 418struct passwd * 419getpwnam(const char *name) 420{ 421 union key key; 422 423 key.name = name; 424 return (getpw(wrap_getpwnam_r, key)); 425} 426 427 428struct passwd * 429getpwuid(uid_t uid) 430{ 431 union key key; 432 433 key.uid = uid; 434 return (getpw(wrap_getpwuid_r, key)); 435} 436 437 438struct passwd * 439getpwent(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 */ 451static DB * 452pwdbopen(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 481static void 482files_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 495static int 496files_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 525static int 526files_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)); 643fin: 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 658static int 659pwdb_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 685static int 686pwdb_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 728static int 729pwdb_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 756static int 757pwdb_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 */ 802static void 803dns_endstate(void *p) 804{ 805 free(p); 806} 807 808 809static int 810dns_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 823static int 824dns_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)); 910fin: 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 */ 930static void 931nis_endstate(void *p) 932{ 933 free(((struct nis_state *)p)->key); 934 free(p); 935} 936 937/* 938 * Test for the presence of special FreeBSD-specific master.passwd.by* 939 * maps. We do this using yp_order(). If it fails, then either the server 940 * doesn't have the map, or the YPPROC_ORDER procedure isn't supported by 941 * the server (Sun NIS+ servers in YP compat mode behave this way). If 942 * the master.passwd.by* maps don't exist, then let the lookup routine try 943 * the regular passwd.by* maps instead. If the lookup routine fails, it 944 * can return an error as needed. 945 */ 946static int 947nis_map(char *domain, enum nss_lookup_type how, char *buffer, size_t bufsize, 948 int *master) 949{ 950 int rv, order; 951 952 *master = 0; 953 if (geteuid() == 0) { 954 if (snprintf(buffer, bufsize, "master.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 *master = 1; 960 return (NS_SUCCESS); 961 } 962 } 963 964 if (snprintf(buffer, bufsize, "passwd.by%s", 965 (how == nss_lt_id) ? "uid" : "name") >= bufsize) 966 return (NS_UNAVAIL); 967 968 return (NS_SUCCESS); 969} 970 971 972static int 973nis_adjunct(char *domain, const char *name, char *buffer, size_t bufsize) 974{ 975 int rv; 976 char *result, *p, *q, *eor; 977 int resultlen; 978 979 result = NULL; 980 rv = yp_match(domain, "passwd.adjunct.byname", name, strlen(name), 981 &result, &resultlen); 982 if (rv != 0) 983 rv = 1; 984 else { 985 eor = &result[resultlen]; 986 p = memchr(result, ':', eor - result); 987 if (p != NULL && ++p < eor && 988 (q = memchr(p, ':', eor - p)) != NULL) { 989 if (q - p >= bufsize) 990 rv = -1; 991 else { 992 memcpy(buffer, p, q - p); 993 buffer[q - p] ='\0'; 994 } 995 } else 996 rv = 1; 997 } 998 free(result); 999 return (rv); 1000} 1001 1002 1003static int 1004nis_setpwent(void *retval, void *mdata, va_list ap) 1005{ 1006 struct nis_state *st; 1007 int rv; 1008 1009 rv = nis_getstate(&st); 1010 if (rv != 0) 1011 return (NS_UNAVAIL); 1012 st->done = 0; 1013 free(st->key); 1014 st->key = NULL; 1015 return (NS_UNAVAIL); 1016} 1017 1018 1019static int 1020nis_passwd(void *retval, void *mdata, va_list ap) 1021{ 1022 char map[YPMAXMAP]; 1023 struct nis_state *st; 1024 struct passwd *pwd; 1025 const char *name; 1026 char *buffer, *key, *result; 1027 size_t bufsize; 1028 uid_t uid; 1029 enum nss_lookup_type how; 1030 int *errnop, keylen, resultlen, rv, master; 1031 1032 name = NULL; 1033 uid = (uid_t)-1; 1034 how = (enum nss_lookup_type)mdata; 1035 switch (how) { 1036 case nss_lt_name: 1037 name = va_arg(ap, const char *); 1038 break; 1039 case nss_lt_id: 1040 uid = va_arg(ap, uid_t); 1041 break; 1042 case nss_lt_all: 1043 break; 1044 } 1045 pwd = va_arg(ap, struct passwd *); 1046 buffer = va_arg(ap, char *); 1047 bufsize = va_arg(ap, size_t); 1048 errnop = va_arg(ap, int *); 1049 *errnop = nis_getstate(&st); 1050 if (*errnop != 0) 1051 return (NS_UNAVAIL); 1052 if (st->domain[0] == '\0') { 1053 if (getdomainname(st->domain, sizeof(st->domain)) != 0) { 1054 *errnop = errno; 1055 return (NS_UNAVAIL); 1056 } 1057 } 1058 rv = nis_map(st->domain, how, map, sizeof(map), &master); 1059 if (rv != NS_SUCCESS) 1060 return (rv); 1061 result = NULL; 1062 do { 1063 rv = NS_NOTFOUND; 1064 switch (how) { 1065 case nss_lt_name: 1066 if (strlcpy(buffer, name, bufsize) >= bufsize) 1067 goto erange; 1068 break; 1069 case nss_lt_id: 1070 if (snprintf(buffer, bufsize, "%lu", 1071 (unsigned long)uid) >= bufsize) 1072 goto erange; 1073 break; 1074 case nss_lt_all: 1075 if (st->done) 1076 goto fin; 1077 break; 1078 } 1079 result = NULL; 1080 if (how == nss_lt_all) { 1081 if (st->key == NULL) 1082 rv = yp_first(st->domain, map, &st->key, 1083 &st->keylen, &result, &resultlen); 1084 else { 1085 key = st->key; 1086 keylen = st->keylen; 1087 st->key = NULL; 1088 rv = yp_next(st->domain, map, key, keylen, 1089 &st->key, &st->keylen, &result, 1090 &resultlen); 1091 free(key); 1092 } 1093 if (rv != 0) { 1094 free(result); 1095 free(st->key); 1096 st->key = NULL; 1097 if (rv == YPERR_NOMORE) 1098 st->done = 1; 1099 else 1100 rv = NS_UNAVAIL; 1101 goto fin; 1102 } 1103 } else { 1104 rv = yp_match(st->domain, map, buffer, strlen(buffer), 1105 &result, &resultlen); 1106 if (rv == YPERR_KEY) { 1107 rv = NS_NOTFOUND; 1108 continue; 1109 } else if (rv != 0) { 1110 free(result); 1111 rv = NS_UNAVAIL; 1112 continue; 1113 } 1114 } 1115 if (resultlen >= bufsize) 1116 goto erange; 1117 memcpy(buffer, result, resultlen); 1118 buffer[resultlen] = '\0'; 1119 free(result); 1120 rv = __pw_match_entry(buffer, resultlen, how, name, uid); 1121 if (rv == NS_SUCCESS) 1122 rv = __pw_parse_entry(buffer, resultlen, pwd, master, 1123 errnop); 1124 } while (how == nss_lt_all && !(rv & NS_TERMINATE)); 1125fin: 1126 if (rv == NS_SUCCESS) { 1127 if (strstr(pwd->pw_passwd, "##") != NULL) { 1128 rv = nis_adjunct(st->domain, pwd->pw_name, 1129 &buffer[resultlen+1], bufsize-resultlen-1); 1130 if (rv < 0) 1131 goto erange; 1132 else if (rv == 0) 1133 pwd->pw_passwd = &buffer[resultlen+1]; 1134 } 1135 pwd->pw_fields &= ~_PWF_SOURCE; 1136 pwd->pw_fields |= _PWF_NIS; 1137 if (retval != NULL) 1138 *(struct passwd **)retval = pwd; 1139 } 1140 return (rv); 1141erange: 1142 *errnop = ERANGE; 1143 return (NS_RETURN); 1144} 1145#endif /* YP */ 1146 1147 1148/* 1149 * compat backend 1150 */ 1151static void 1152compat_clear_template(struct passwd *template) 1153{ 1154 1155 free(template->pw_passwd); 1156 free(template->pw_gecos); 1157 free(template->pw_dir); 1158 free(template->pw_shell); 1159 memset(template, 0, sizeof(*template)); 1160} 1161 1162 1163static int 1164compat_set_template(struct passwd *src, struct passwd *template) 1165{ 1166 1167 compat_clear_template(template); 1168#ifdef PW_OVERRIDE_PASSWD 1169 if ((src->pw_fields & _PWF_PASSWD) && 1170 (template->pw_passwd = strdup(src->pw_passwd)) == NULL) 1171 goto enomem; 1172#endif 1173 if (src->pw_fields & _PWF_UID) 1174 template->pw_uid = src->pw_uid; 1175 if (src->pw_fields & _PWF_GID) 1176 template->pw_gid = src->pw_gid; 1177 if ((src->pw_fields & _PWF_GECOS) && 1178 (template->pw_gecos = strdup(src->pw_gecos)) == NULL) 1179 goto enomem; 1180 if ((src->pw_fields & _PWF_DIR) && 1181 (template->pw_dir = strdup(src->pw_dir)) == NULL) 1182 goto enomem; 1183 if ((src->pw_fields & _PWF_SHELL) && 1184 (template->pw_shell = strdup(src->pw_shell)) == NULL) 1185 goto enomem; 1186 template->pw_fields = src->pw_fields; 1187 return (0); 1188enomem: 1189 syslog(LOG_ERR, "getpwent memory allocation failure"); 1190 return (-1); 1191} 1192 1193 1194static int 1195compat_use_template(struct passwd *pwd, struct passwd *template, char *buffer, 1196 size_t bufsize) 1197{ 1198 struct passwd hold; 1199 char *copy, *p, *q, *eob; 1200 size_t n; 1201 1202 /* We cannot know the layout of the password fields in `buffer', 1203 * so we have to copy everything. 1204 */ 1205 if (template->pw_fields == 0) /* nothing to fill-in */ 1206 return (0); 1207 n = 0; 1208 n += pwd->pw_name != NULL ? strlen(pwd->pw_name) + 1 : 0; 1209 n += pwd->pw_passwd != NULL ? strlen(pwd->pw_passwd) + 1 : 0; 1210 n += pwd->pw_class != NULL ? strlen(pwd->pw_class) + 1 : 0; 1211 n += pwd->pw_gecos != NULL ? strlen(pwd->pw_gecos) + 1 : 0; 1212 n += pwd->pw_dir != NULL ? strlen(pwd->pw_dir) + 1 : 0; 1213 n += pwd->pw_shell != NULL ? strlen(pwd->pw_shell) + 1 : 0; 1214 copy = malloc(n); 1215 if (copy == NULL) { 1216 syslog(LOG_ERR, "getpwent memory allocation failure"); 1217 return (ENOMEM); 1218 } 1219 p = copy; 1220 eob = ©[n]; 1221#define COPY(field) do { \ 1222 if (pwd->field == NULL) \ 1223 hold.field = NULL; \ 1224 else { \ 1225 hold.field = p; \ 1226 p += strlcpy(p, pwd->field, eob-p) + 1; \ 1227 } \ 1228} while (0) 1229 COPY(pw_name); 1230 COPY(pw_passwd); 1231 COPY(pw_class); 1232 COPY(pw_gecos); 1233 COPY(pw_dir); 1234 COPY(pw_shell); 1235#undef COPY 1236 p = buffer; 1237 eob = &buffer[bufsize]; 1238#define COPY(field, flag) do { \ 1239 q = (template->pw_fields & flag) ? template->field : hold.field; \ 1240 if (q == NULL) \ 1241 pwd->field = NULL; \ 1242 else { \ 1243 pwd->field = p; \ 1244 if ((n = strlcpy(p, q, eob-p)) >= eob-p) { \ 1245 free(copy); \ 1246 return (ERANGE); \ 1247 } \ 1248 p += n + 1; \ 1249 } \ 1250} while (0) 1251 COPY(pw_name, 0); 1252#ifdef PW_OVERRIDE_PASSWD 1253 COPY(pw_passwd, _PWF_PASSWD); 1254#else 1255 COPY(pw_passwd, 0); 1256#endif 1257 COPY(pw_class, 0); 1258 COPY(pw_gecos, _PWF_GECOS); 1259 COPY(pw_dir, _PWF_DIR); 1260 COPY(pw_shell, _PWF_SHELL); 1261#undef COPY 1262#define COPY(field, flag) do { \ 1263 if (template->pw_fields & flag) \ 1264 pwd->field = template->field; \ 1265} while (0) 1266 COPY(pw_uid, _PWF_UID); 1267 COPY(pw_gid, _PWF_GID); 1268#undef COPY 1269 free(copy); 1270 return (0); 1271} 1272 1273 1274static int 1275compat_exclude(const char *name, DB **db) 1276{ 1277 DBT key, data; 1278 1279 if (*db == NULL && 1280 (*db = dbopen(NULL, O_RDWR, 600, DB_HASH, 0)) == NULL) 1281 return (errno); 1282 key.size = strlen(name); 1283 key.data = (char *)name; 1284 data.size = 0; 1285 data.data = NULL; 1286 1287 if ((*db)->put(*db, &key, &data, 0) == -1) 1288 return (errno); 1289 return (0); 1290} 1291 1292 1293static int 1294compat_is_excluded(const char *name, DB *db) 1295{ 1296 DBT key, data; 1297 1298 if (db == NULL) 1299 return (0); 1300 key.size = strlen(name); 1301 key.data = (char *)name; 1302 return (db->get(db, &key, &data, 0) == 0); 1303} 1304 1305 1306static int 1307compat_redispatch(struct compat_state *st, enum nss_lookup_type how, 1308 enum nss_lookup_type lookup_how, const char *name, const char *lookup_name, 1309 uid_t uid, struct passwd *pwd, char *buffer, size_t bufsize, int *errnop) 1310{ 1311 static const ns_src compatsrc[] = { 1312#ifdef YP 1313 { NSSRC_NIS, NS_SUCCESS }, 1314#endif 1315 { NULL, 0 } 1316 }; 1317 ns_dtab dtab[] = { 1318#ifdef YP 1319 { NSSRC_NIS, nis_passwd, NULL }, 1320#endif 1321#ifdef HESIOD 1322 { NSSRC_DNS, dns_passwd, NULL }, 1323#endif 1324 { NULL, NULL, NULL } 1325 }; 1326 void *discard; 1327 int rv, e, i; 1328 1329 for (i = 0; i < sizeof(dtab)/sizeof(dtab[0]) - 1; i++) 1330 dtab[i].mdata = (void *)lookup_how; 1331more: 1332 pwd_init(pwd); 1333 switch (lookup_how) { 1334 case nss_lt_all: 1335 rv = _nsdispatch(&discard, dtab, NSDB_PASSWD_COMPAT, 1336 "getpwent_r", compatsrc, pwd, buffer, bufsize, 1337 errnop); 1338 break; 1339 case nss_lt_id: 1340 rv = _nsdispatch(&discard, dtab, NSDB_PASSWD_COMPAT, 1341 "getpwuid_r", compatsrc, uid, pwd, buffer, 1342 bufsize, errnop); 1343 break; 1344 case nss_lt_name: 1345 rv = _nsdispatch(&discard, dtab, NSDB_PASSWD_COMPAT, 1346 "getpwnam_r", compatsrc, lookup_name, pwd, buffer, 1347 bufsize, errnop); 1348 break; 1349 default: 1350 return (NS_UNAVAIL); 1351 } 1352 if (rv != NS_SUCCESS) 1353 return (rv); 1354 if (compat_is_excluded(pwd->pw_name, st->exclude)) { 1355 if (how == nss_lt_all) 1356 goto more; 1357 return (NS_NOTFOUND); 1358 } 1359 e = compat_use_template(pwd, &st->template, buffer, bufsize); 1360 if (e != 0) { 1361 *errnop = e; 1362 if (e == ERANGE) 1363 return (NS_RETURN); 1364 else 1365 return (NS_UNAVAIL); 1366 } 1367 switch (how) { 1368 case nss_lt_name: 1369 if (strcmp(name, pwd->pw_name) != 0) 1370 return (NS_NOTFOUND); 1371 break; 1372 case nss_lt_id: 1373 if (uid != pwd->pw_uid) 1374 return (NS_NOTFOUND); 1375 break; 1376 default: 1377 break; 1378 } 1379 return (NS_SUCCESS); 1380} 1381 1382 1383static void 1384compat_endstate(void *p) 1385{ 1386 struct compat_state *st; 1387 1388 if (p == NULL) 1389 return; 1390 st = (struct compat_state *)p; 1391 if (st->db != NULL) 1392 st->db->close(st->db); 1393 if (st->exclude != NULL) 1394 st->exclude->close(st->exclude); 1395 compat_clear_template(&st->template); 1396 free(p); 1397} 1398 1399 1400static int 1401compat_setpwent(void *retval, void *mdata, va_list ap) 1402{ 1403 static const ns_src compatsrc[] = { 1404#ifdef YP 1405 { NSSRC_NIS, NS_SUCCESS }, 1406#endif 1407 { NULL, 0 } 1408 }; 1409 ns_dtab dtab[] = { 1410#ifdef YP 1411 { NSSRC_NIS, nis_setpwent, NULL }, 1412#endif 1413#ifdef HESIOD 1414 { NSSRC_DNS, dns_setpwent, NULL }, 1415#endif 1416 { NULL, NULL, NULL } 1417 }; 1418 struct compat_state *st; 1419 int rv, stayopen; 1420 1421#define set_setent(x, y) do { \ 1422 int i; \ 1423 \ 1424 for (i = 0; i < (sizeof(x)/sizeof(x[0])) - 1; i++) \ 1425 x[i].mdata = (void *)y; \ 1426} while (0) 1427 1428 rv = compat_getstate(&st); 1429 if (rv != 0) 1430 return (NS_UNAVAIL); 1431 switch ((enum constants)mdata) { 1432 case SETPWENT: 1433 stayopen = va_arg(ap, int); 1434 st->keynum = 0; 1435 if (stayopen) 1436 st->db = pwdbopen(&st->version); 1437 st->stayopen = stayopen; 1438 set_setent(dtab, mdata); 1439 (void)_nsdispatch(NULL, dtab, NSDB_PASSWD_COMPAT, "setpwent", 1440 compatsrc, 0); 1441 break; 1442 case ENDPWENT: 1443 if (st->db != NULL) { 1444 (void)st->db->close(st->db); 1445 st->db = NULL; 1446 } 1447 set_setent(dtab, mdata); 1448 (void)_nsdispatch(NULL, dtab, NSDB_PASSWD_COMPAT, "endpwent", 1449 compatsrc, 0); 1450 break; 1451 default: 1452 break; 1453 } 1454 return (NS_UNAVAIL); 1455#undef set_setent 1456} 1457 1458 1459static int 1460compat_passwd(void *retval, void *mdata, va_list ap) 1461{ 1462 char keybuf[MAXLOGNAME + 1]; 1463 DBT key, entry; 1464 struct compat_state *st; 1465 enum nss_lookup_type how; 1466 const char *name; 1467 struct passwd *pwd; 1468 char *buffer, *pw_name; 1469 char *host, *user, *domain; 1470 size_t bufsize; 1471 uid_t uid; 1472 uint32_t store; 1473 int rv, from_compat, stayopen, *errnop; 1474 1475 from_compat = 0; 1476 name = NULL; 1477 uid = (uid_t)-1; 1478 how = (enum nss_lookup_type)mdata; 1479 switch (how) { 1480 case nss_lt_name: 1481 name = va_arg(ap, const char *); 1482 break; 1483 case nss_lt_id: 1484 uid = va_arg(ap, uid_t); 1485 break; 1486 case nss_lt_all: 1487 break; 1488 default: 1489 rv = NS_NOTFOUND; 1490 goto fin; 1491 } 1492 pwd = va_arg(ap, struct passwd *); 1493 buffer = va_arg(ap, char *); 1494 bufsize = va_arg(ap, size_t); 1495 errnop = va_arg(ap, int *); 1496 *errnop = compat_getstate(&st); 1497 if (*errnop != 0) 1498 return (NS_UNAVAIL); 1499 if (how == nss_lt_all && st->keynum < 0) { 1500 rv = NS_NOTFOUND; 1501 goto fin; 1502 } 1503 if (st->db == NULL && 1504 (st->db = pwdbopen(&st->version)) == NULL) { 1505 *errnop = errno; 1506 rv = NS_UNAVAIL; 1507 goto fin; 1508 } 1509 if (how == nss_lt_all) { 1510 if (st->keynum < 0) { 1511 rv = NS_NOTFOUND; 1512 goto fin; 1513 } 1514 stayopen = 1; 1515 } else { 1516 st->keynum = 0; 1517 stayopen = st->stayopen; 1518 } 1519docompat: 1520 rv = NS_NOTFOUND; 1521 switch (st->compat) { 1522 case COMPAT_MODE_ALL: 1523 rv = compat_redispatch(st, how, how, name, name, uid, pwd, 1524 buffer, bufsize, errnop); 1525 if (rv != NS_SUCCESS) 1526 st->compat = COMPAT_MODE_OFF; 1527 break; 1528 case COMPAT_MODE_NETGROUP: 1529 /* XXX getnetgrent is not thread-safe. */ 1530 do { 1531 rv = getnetgrent(&host, &user, &domain); 1532 if (rv == 0) { 1533 endnetgrent(); 1534 st->compat = COMPAT_MODE_OFF; 1535 rv = NS_NOTFOUND; 1536 continue; 1537 } else if (user == NULL || user[0] == '\0') 1538 continue; 1539 rv = compat_redispatch(st, how, nss_lt_name, name, 1540 user, uid, pwd, buffer, bufsize, errnop); 1541 } while (st->compat == COMPAT_MODE_NETGROUP && 1542 !(rv & NS_TERMINATE)); 1543 break; 1544 case COMPAT_MODE_NAME: 1545 rv = compat_redispatch(st, how, nss_lt_name, name, st->name, 1546 uid, pwd, buffer, bufsize, errnop); 1547 free(st->name); 1548 st->name = NULL; 1549 st->compat = COMPAT_MODE_OFF; 1550 break; 1551 default: 1552 break; 1553 } 1554 if (rv & NS_TERMINATE) { 1555 from_compat = 1; 1556 goto fin; 1557 } 1558 key.data = keybuf; 1559 rv = NS_NOTFOUND; 1560 while (st->keynum >= 0) { 1561 st->keynum++; 1562 if (st->version < _PWD_CURRENT_VERSION) { 1563 memcpy(&keybuf[1], &st->keynum, sizeof(st->keynum)); 1564 key.size = sizeof(st->keynum) + 1; 1565 } else { 1566 store = htonl(st->keynum); 1567 memcpy(&keybuf[1], &store, sizeof(store)); 1568 key.size = sizeof(store) + 1; 1569 } 1570 keybuf[0] = _PW_VERSIONED(_PW_KEYBYNUM, st->version); 1571 rv = st->db->get(st->db, &key, &entry, 0); 1572 if (rv < 0 || rv > 1) { /* should never return > 1 */ 1573 *errnop = errno; 1574 rv = NS_UNAVAIL; 1575 goto fin; 1576 } else if (rv == 1) { 1577 st->keynum = -1; 1578 rv = NS_NOTFOUND; 1579 goto fin; 1580 } 1581 pw_name = (char *)entry.data; 1582 switch (pw_name[0]) { 1583 case '+': 1584 switch (pw_name[1]) { 1585 case '\0': 1586 st->compat = COMPAT_MODE_ALL; 1587 break; 1588 case '@': 1589 setnetgrent(&pw_name[2]); 1590 st->compat = COMPAT_MODE_NETGROUP; 1591 break; 1592 default: 1593 st->name = strdup(&pw_name[1]); 1594 if (st->name == NULL) { 1595 syslog(LOG_ERR, 1596 "getpwent memory allocation failure"); 1597 *errnop = ENOMEM; 1598 rv = NS_UNAVAIL; 1599 break; 1600 } 1601 st->compat = COMPAT_MODE_NAME; 1602 } 1603 if (entry.size > bufsize) { 1604 *errnop = ERANGE; 1605 rv = NS_RETURN; 1606 goto fin; 1607 } 1608 memcpy(buffer, entry.data, entry.size); 1609 rv = pwdb_versions[st->version].parse(buffer, 1610 entry.size, pwd, errnop); 1611 if (rv != NS_SUCCESS) 1612 ; 1613 else if (compat_set_template(pwd, &st->template) < 0) { 1614 *errnop = ENOMEM; 1615 rv = NS_UNAVAIL; 1616 goto fin; 1617 } 1618 goto docompat; 1619 case '-': 1620 switch (pw_name[1]) { 1621 case '\0': 1622 /* XXX Maybe syslog warning */ 1623 continue; 1624 case '@': 1625 setnetgrent(&pw_name[2]); 1626 while (getnetgrent(&host, &user, &domain) != 1627 0) { 1628 if (user != NULL && user[0] != '\0') 1629 compat_exclude(user, 1630 &st->exclude); 1631 } 1632 endnetgrent(); 1633 continue; 1634 default: 1635 compat_exclude(&pw_name[1], &st->exclude); 1636 continue; 1637 } 1638 break; 1639 default: 1640 break; 1641 } 1642 if (compat_is_excluded((char *)entry.data, st->exclude)) 1643 continue; 1644 rv = pwdb_versions[st->version].match(entry.data, entry.size, 1645 how, name, uid); 1646 if (rv == NS_RETURN) 1647 break; 1648 else if (rv != NS_SUCCESS) 1649 continue; 1650 if (entry.size > bufsize) { 1651 *errnop = ERANGE; 1652 rv = NS_RETURN; 1653 break; 1654 } 1655 memcpy(buffer, entry.data, entry.size); 1656 rv = pwdb_versions[st->version].parse(buffer, entry.size, pwd, 1657 errnop); 1658 if (rv & NS_TERMINATE) 1659 break; 1660 } 1661fin: 1662 if (!stayopen && st->db != NULL) { 1663 (void)st->db->close(st->db); 1664 st->db = NULL; 1665 } 1666 if (rv == NS_SUCCESS) { 1667 if (!from_compat) { 1668 pwd->pw_fields &= ~_PWF_SOURCE; 1669 pwd->pw_fields |= _PWF_FILES; 1670 } 1671 if (retval != NULL) 1672 *(struct passwd **)retval = pwd; 1673 } 1674 return (rv); 1675} 1676 1677 1678/* 1679 * common passwd line matching and parsing 1680 */ 1681int 1682__pw_match_entry(const char *entry, size_t entrysize, enum nss_lookup_type how, 1683 const char *name, uid_t uid) 1684{ 1685 const char *p, *eom; 1686 char *q; 1687 size_t len; 1688 unsigned long m; 1689 1690 eom = entry + entrysize; 1691 for (p = entry; p < eom; p++) 1692 if (*p == ':') 1693 break; 1694 if (*p != ':') 1695 return (NS_NOTFOUND); 1696 if (how == nss_lt_all) 1697 return (NS_SUCCESS); 1698 if (how == nss_lt_name) { 1699 len = strlen(name); 1700 if (len == (p - entry) && memcmp(name, entry, len) == 0) 1701 return (NS_SUCCESS); 1702 else 1703 return (NS_NOTFOUND); 1704 } 1705 for (p++; p < eom; p++) 1706 if (*p == ':') 1707 break; 1708 if (*p != ':') 1709 return (NS_NOTFOUND); 1710 m = strtoul(++p, &q, 10); 1711 if (q[0] != ':' || (uid_t)m != uid) 1712 return (NS_NOTFOUND); 1713 else 1714 return (NS_SUCCESS); 1715} 1716 1717 1718/* XXX buffer must be NUL-terminated. errnop is not set correctly. */ 1719int 1720__pw_parse_entry(char *buffer, size_t bufsize __unused, struct passwd *pwd, 1721 int master, int *errnop __unused) 1722{ 1723 1724 if (__pw_scan(buffer, pwd, master ? _PWSCAN_MASTER : 0) == 0) 1725 return (NS_NOTFOUND); 1726 else 1727 return (NS_SUCCESS); 1728} 1729