| 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 | * $FreeBSD: src/lib/libc/gen/getgrent.c,v 1.37 2007/12/12 10:08:02 bushman Exp $ |
| 33 | */ |
| 34 | |
| 35 | #include "namespace.h" |
| 36 | #include <sys/param.h> |
| 37 | #ifdef YP |
| 38 | #include <rpc/rpc.h> |
| 39 | #include <rpcsvc/yp_prot.h> |
| 40 | #include <rpcsvc/ypclnt.h> |
| 41 | #endif |
| 42 | #include <assert.h> |
| 43 | #include <ctype.h> |
| 44 | #include <errno.h> |
| 45 | #ifdef HESIOD |
| 46 | #include <hesiod.h> |
| 47 | #endif |
| 48 | #include <grp.h> |
| 49 | #include <nsswitch.h> |
| 50 | #include <pthread.h> |
| 51 | #include <pthread_np.h> |
| 52 | #include <stdio.h> |
| 53 | #include <stdlib.h> |
| 54 | #include <string.h> |
| 55 | #include <syslog.h> |
| 56 | #include <unistd.h> |
| 57 | #include "un-namespace.h" |
| 58 | #include "libc_private.h" |
| 59 | #include "nss_tls.h" |
| 60 | #ifdef NS_CACHING |
| 61 | #include "nscache.h" |
| 62 | #endif |
| 63 | |
| 64 | enum constants { |
| 65 | GRP_STORAGE_INITIAL = 1 << 10, /* 1 KByte */ |
| 66 | GRP_STORAGE_MAX = 1 << 20, /* 1 MByte */ |
| 67 | SETGRENT = 1, |
| 68 | ENDGRENT = 2, |
| 69 | HESIOD_NAME_MAX = 256, |
| 70 | }; |
| 71 | |
| 72 | static const ns_src defaultsrc[] = { |
| 73 | { NSSRC_COMPAT, NS_SUCCESS }, |
| 74 | { NULL, 0 } |
| 75 | }; |
| 76 | |
| 77 | int __getgroupmembership(const char *, gid_t, gid_t *, int, int *); |
| 78 | int __gr_match_entry(const char *, size_t, enum nss_lookup_type, |
| 79 | const char *, gid_t); |
| 80 | int __gr_parse_entry(char *, size_t, struct group *, char *, size_t, |
| 81 | int *); |
| 82 | |
| 83 | static int is_comment_line(const char *, size_t); |
| 84 | |
| 85 | union key { |
| 86 | const char *name; |
| 87 | gid_t gid; |
| 88 | }; |
| 89 | static struct group *getgr(int (*)(union key, struct group *, char *, size_t, |
| 90 | struct group **), union key); |
| 91 | static int wrap_getgrnam_r(union key, struct group *, char *, size_t, |
| 92 | struct group **); |
| 93 | static int wrap_getgrgid_r(union key, struct group *, char *, size_t, |
| 94 | struct group **); |
| 95 | static int wrap_getgrent_r(union key, struct group *, char *, size_t, |
| 96 | struct group **); |
| 97 | |
| 98 | struct files_state { |
| 99 | FILE *fp; |
| 100 | int stayopen; |
| 101 | }; |
| 102 | static void files_endstate(void *); |
| 103 | NSS_TLS_HANDLING(files); |
| 104 | static int files_setgrent(void *, void *, va_list); |
| 105 | static int files_group(void *, void *, va_list); |
| 106 | |
| 107 | |
| 108 | #ifdef HESIOD |
| 109 | struct dns_state { |
| 110 | long counter; |
| 111 | }; |
| 112 | static void dns_endstate(void *); |
| 113 | NSS_TLS_HANDLING(dns); |
| 114 | static int dns_setgrent(void *, void *, va_list); |
| 115 | static int dns_group(void *, void *, va_list); |
| 116 | #endif |
| 117 | |
| 118 | |
| 119 | #ifdef YP |
| 120 | struct nis_state { |
| 121 | char domain[MAXHOSTNAMELEN]; |
| 122 | int done; |
| 123 | char *key; |
| 124 | int keylen; |
| 125 | }; |
| 126 | static void nis_endstate(void *); |
| 127 | NSS_TLS_HANDLING(nis); |
| 128 | static int nis_setgrent(void *, void *, va_list); |
| 129 | static int nis_group(void *, void *, va_list); |
| 130 | #endif |
| 131 | |
| 132 | struct compat_state { |
| 133 | FILE *fp; |
| 134 | int stayopen; |
| 135 | char *name; |
| 136 | enum _compat { |
| 137 | COMPAT_MODE_OFF = 0, |
| 138 | COMPAT_MODE_ALL, |
| 139 | COMPAT_MODE_NAME |
| 140 | } compat; |
| 141 | }; |
| 142 | static void compat_endstate(void *); |
| 143 | NSS_TLS_HANDLING(compat); |
| 144 | static int compat_setgrent(void *, void *, va_list); |
| 145 | static int compat_group(void *, void *, va_list); |
| 146 | |
| 147 | static int gr_addgid(gid_t, gid_t *, int, int *); |
| 148 | static int getgroupmembership_fallback(void *, void *, va_list); |
| 149 | |
| 150 | #ifdef NS_CACHING |
| 151 | static int grp_id_func(char *, size_t *, va_list, void *); |
| 152 | static int grp_marshal_func(char *, size_t *, void *, va_list, void *); |
| 153 | static int grp_unmarshal_func(char *, size_t, void *, va_list, void *); |
| 154 | |
| 155 | static int |
| 156 | grp_id_func(char *buffer, size_t *buffer_size, va_list ap, void *cache_mdata) |
| 157 | { |
| 158 | char *name; |
| 159 | gid_t gid; |
| 160 | |
| 161 | size_t desired_size, size; |
| 162 | int res = NS_UNAVAIL; |
| 163 | enum nss_lookup_type lookup_type; |
| 164 | |
| 165 | |
| 166 | lookup_type = (enum nss_lookup_type)cache_mdata; |
| 167 | switch (lookup_type) { |
| 168 | case nss_lt_name: |
| 169 | name = va_arg(ap, char *); |
| 170 | size = strlen(name); |
| 171 | desired_size = sizeof(enum nss_lookup_type) + size + 1; |
| 172 | if (desired_size > *buffer_size) { |
| 173 | res = NS_RETURN; |
| 174 | goto fin; |
| 175 | } |
| 176 | |
| 177 | memcpy(buffer, &lookup_type, sizeof(enum nss_lookup_type)); |
| 178 | memcpy(buffer + sizeof(enum nss_lookup_type), name, size + 1); |
| 179 | |
| 180 | res = NS_SUCCESS; |
| 181 | break; |
| 182 | case nss_lt_id: |
| 183 | gid = va_arg(ap, gid_t); |
| 184 | desired_size = sizeof(enum nss_lookup_type) + sizeof(gid_t); |
| 185 | if (desired_size > *buffer_size) { |
| 186 | res = NS_RETURN; |
| 187 | goto fin; |
| 188 | } |
| 189 | |
| 190 | memcpy(buffer, &lookup_type, sizeof(enum nss_lookup_type)); |
| 191 | memcpy(buffer + sizeof(enum nss_lookup_type), &gid, |
| 192 | sizeof(gid_t)); |
| 193 | |
| 194 | res = NS_SUCCESS; |
| 195 | break; |
| 196 | default: |
| 197 | /* should be unreachable */ |
| 198 | return (NS_UNAVAIL); |
| 199 | } |
| 200 | |
| 201 | fin: |
| 202 | *buffer_size = desired_size; |
| 203 | return (res); |
| 204 | } |
| 205 | |
| 206 | static int |
| 207 | grp_marshal_func(char *buffer, size_t *buffer_size, void *retval __unused, |
| 208 | va_list ap, void *cache_mdata) |
| 209 | { |
| 210 | char *name __unused; |
| 211 | gid_t gid __unused; |
| 212 | struct group *grp; |
| 213 | char *orig_buf __unused; |
| 214 | size_t orig_buf_size __unused; |
| 215 | |
| 216 | struct group new_grp; |
| 217 | size_t desired_size, size, mem_size; |
| 218 | char *p, **mem; |
| 219 | |
| 220 | switch ((enum nss_lookup_type)cache_mdata) { |
| 221 | case nss_lt_name: |
| 222 | name = va_arg(ap, char *); |
| 223 | break; |
| 224 | case nss_lt_id: |
| 225 | gid = va_arg(ap, gid_t); |
| 226 | break; |
| 227 | case nss_lt_all: |
| 228 | break; |
| 229 | default: |
| 230 | /* should be unreachable */ |
| 231 | return (NS_UNAVAIL); |
| 232 | } |
| 233 | |
| 234 | grp = va_arg(ap, struct group *); |
| 235 | orig_buf = va_arg(ap, char *); |
| 236 | orig_buf_size = va_arg(ap, size_t); |
| 237 | |
| 238 | desired_size = _ALIGNBYTES + sizeof(struct group) + sizeof(char *); |
| 239 | |
| 240 | if (grp->gr_name != NULL) |
| 241 | desired_size += strlen(grp->gr_name) + 1; |
| 242 | if (grp->gr_passwd != NULL) |
| 243 | desired_size += strlen(grp->gr_passwd) + 1; |
| 244 | |
| 245 | if (grp->gr_mem != NULL) { |
| 246 | mem_size = 0; |
| 247 | for (mem = grp->gr_mem; *mem; ++mem) { |
| 248 | desired_size += strlen(*mem) + 1; |
| 249 | ++mem_size; |
| 250 | } |
| 251 | |
| 252 | desired_size += _ALIGNBYTES + (mem_size + 1) * sizeof(char *); |
| 253 | } |
| 254 | |
| 255 | if (desired_size > *buffer_size) { |
| 256 | /* this assignment is here for future use */ |
| 257 | *buffer_size = desired_size; |
| 258 | return (NS_RETURN); |
| 259 | } |
| 260 | |
| 261 | memcpy(&new_grp, grp, sizeof(struct group)); |
| 262 | memset(buffer, 0, desired_size); |
| 263 | |
| 264 | *buffer_size = desired_size; |
| 265 | p = buffer + sizeof(struct group) + sizeof(char *); |
| 266 | memcpy(buffer + sizeof(struct group), &p, sizeof(char *)); |
| 267 | p = (char *)_ALIGN(p); |
| 268 | |
| 269 | if (new_grp.gr_name != NULL) { |
| 270 | size = strlen(new_grp.gr_name); |
| 271 | memcpy(p, new_grp.gr_name, size); |
| 272 | new_grp.gr_name = p; |
| 273 | p += size + 1; |
| 274 | } |
| 275 | |
| 276 | if (new_grp.gr_passwd != NULL) { |
| 277 | size = strlen(new_grp.gr_passwd); |
| 278 | memcpy(p, new_grp.gr_passwd, size); |
| 279 | new_grp.gr_passwd = p; |
| 280 | p += size + 1; |
| 281 | } |
| 282 | |
| 283 | if (new_grp.gr_mem != NULL) { |
| 284 | p = (char *)_ALIGN(p); |
| 285 | memcpy(p, new_grp.gr_mem, sizeof(char *) * mem_size); |
| 286 | new_grp.gr_mem = (char **)p; |
| 287 | p += sizeof(char *) * (mem_size + 1); |
| 288 | |
| 289 | for (mem = new_grp.gr_mem; *mem; ++mem) { |
| 290 | size = strlen(*mem); |
| 291 | memcpy(p, *mem, size); |
| 292 | *mem = p; |
| 293 | p += size + 1; |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | memcpy(buffer, &new_grp, sizeof(struct group)); |
| 298 | return (NS_SUCCESS); |
| 299 | } |
| 300 | |
| 301 | static int |
| 302 | grp_unmarshal_func(char *buffer, size_t buffer_size, void *retval, va_list ap, |
| 303 | void *cache_mdata) |
| 304 | { |
| 305 | char *name __unused; |
| 306 | gid_t gid __unused; |
| 307 | struct group *grp; |
| 308 | char *orig_buf; |
| 309 | size_t orig_buf_size; |
| 310 | int *ret_errno; |
| 311 | |
| 312 | char *p; |
| 313 | char **mem; |
| 314 | |
| 315 | switch ((enum nss_lookup_type)cache_mdata) { |
| 316 | case nss_lt_name: |
| 317 | name = va_arg(ap, char *); |
| 318 | break; |
| 319 | case nss_lt_id: |
| 320 | gid = va_arg(ap, gid_t); |
| 321 | break; |
| 322 | case nss_lt_all: |
| 323 | break; |
| 324 | default: |
| 325 | /* should be unreachable */ |
| 326 | return (NS_UNAVAIL); |
| 327 | } |
| 328 | |
| 329 | grp = va_arg(ap, struct group *); |
| 330 | orig_buf = va_arg(ap, char *); |
| 331 | orig_buf_size = va_arg(ap, size_t); |
| 332 | ret_errno = va_arg(ap, int *); |
| 333 | |
| 334 | if (orig_buf_size < |
| 335 | buffer_size - sizeof(struct group) - sizeof(char *)) { |
| 336 | *ret_errno = ERANGE; |
| 337 | return (NS_RETURN); |
| 338 | } |
| 339 | |
| 340 | memcpy(grp, buffer, sizeof(struct group)); |
| 341 | memcpy(&p, buffer + sizeof(struct group), sizeof(char *)); |
| 342 | |
| 343 | orig_buf = (char *)_ALIGN(orig_buf); |
| 344 | memcpy(orig_buf, buffer + sizeof(struct group) + sizeof(char *) + |
| 345 | _ALIGN(p) - (size_t)p, |
| 346 | buffer_size - sizeof(struct group) - sizeof(char *) - |
| 347 | _ALIGN(p) + (size_t)p); |
| 348 | p = (char *)_ALIGN(p); |
| 349 | |
| 350 | NS_APPLY_OFFSET(grp->gr_name, orig_buf, p, char *); |
| 351 | NS_APPLY_OFFSET(grp->gr_passwd, orig_buf, p, char *); |
| 352 | if (grp->gr_mem != NULL) { |
| 353 | NS_APPLY_OFFSET(grp->gr_mem, orig_buf, p, char **); |
| 354 | |
| 355 | for (mem = grp->gr_mem; *mem; ++mem) |
| 356 | NS_APPLY_OFFSET(*mem, orig_buf, p, char *); |
| 357 | } |
| 358 | |
| 359 | if (retval != NULL) |
| 360 | *((struct group **)retval) = grp; |
| 361 | |
| 362 | return (NS_SUCCESS); |
| 363 | } |
| 364 | |
| 365 | NSS_MP_CACHE_HANDLING(group); |
| 366 | #endif /* NS_CACHING */ |
| 367 | |
| 368 | #ifdef NS_CACHING |
| 369 | static const nss_cache_info setgrent_cache_info = NS_MP_CACHE_INFO_INITIALIZER( |
| 370 | group, (void *)nss_lt_all, |
| 371 | NULL, NULL); |
| 372 | #endif |
| 373 | |
| 374 | static const ns_dtab setgrent_dtab[] = { |
| 375 | { NSSRC_FILES, files_setgrent, (void *)SETGRENT }, |
| 376 | #ifdef HESIOD |
| 377 | { NSSRC_DNS, dns_setgrent, (void *)SETGRENT }, |
| 378 | #endif |
| 379 | #ifdef YP |
| 380 | { NSSRC_NIS, nis_setgrent, (void *)SETGRENT }, |
| 381 | #endif |
| 382 | { NSSRC_COMPAT, compat_setgrent, (void *)SETGRENT }, |
| 383 | #ifdef NS_CACHING |
| 384 | NS_CACHE_CB(&setgrent_cache_info) |
| 385 | #endif |
| 386 | { NULL, NULL, NULL } |
| 387 | }; |
| 388 | |
| 389 | #ifdef NS_CACHING |
| 390 | static const nss_cache_info endgrent_cache_info = NS_MP_CACHE_INFO_INITIALIZER( |
| 391 | group, (void *)nss_lt_all, |
| 392 | NULL, NULL); |
| 393 | #endif |
| 394 | |
| 395 | static const ns_dtab endgrent_dtab[] = { |
| 396 | { NSSRC_FILES, files_setgrent, (void *)ENDGRENT }, |
| 397 | #ifdef HESIOD |
| 398 | { NSSRC_DNS, dns_setgrent, (void *)ENDGRENT }, |
| 399 | #endif |
| 400 | #ifdef YP |
| 401 | { NSSRC_NIS, nis_setgrent, (void *)ENDGRENT }, |
| 402 | #endif |
| 403 | { NSSRC_COMPAT, compat_setgrent, (void *)ENDGRENT }, |
| 404 | #ifdef NS_CACHING |
| 405 | NS_CACHE_CB(&endgrent_cache_info) |
| 406 | #endif |
| 407 | { NULL, NULL, NULL } |
| 408 | }; |
| 409 | |
| 410 | #ifdef NS_CACHING |
| 411 | static const nss_cache_info getgrent_r_cache_info = NS_MP_CACHE_INFO_INITIALIZER( |
| 412 | group, (void *)nss_lt_all, |
| 413 | grp_marshal_func, grp_unmarshal_func); |
| 414 | #endif |
| 415 | |
| 416 | static const ns_dtab getgrent_r_dtab[] = { |
| 417 | { NSSRC_FILES, files_group, (void *)nss_lt_all }, |
| 418 | #ifdef HESIOD |
| 419 | { NSSRC_DNS, dns_group, (void *)nss_lt_all }, |
| 420 | #endif |
| 421 | #ifdef YP |
| 422 | { NSSRC_NIS, nis_group, (void *)nss_lt_all }, |
| 423 | #endif |
| 424 | { NSSRC_COMPAT, compat_group, (void *)nss_lt_all }, |
| 425 | #ifdef NS_CACHING |
| 426 | NS_CACHE_CB(&getgrent_r_cache_info) |
| 427 | #endif |
| 428 | { NULL, NULL, NULL } |
| 429 | }; |
| 430 | |
| 431 | static int |
| 432 | gr_addgid(gid_t gid, gid_t *groups, int maxgrp, int *grpcnt) |
| 433 | { |
| 434 | int ret, dupc; |
| 435 | |
| 436 | for (dupc = 0; dupc < MIN(maxgrp, *grpcnt); dupc++) { |
| 437 | if (groups[dupc] == gid) |
| 438 | return 1; |
| 439 | } |
| 440 | |
| 441 | ret = 1; |
| 442 | if (*grpcnt < maxgrp) |
| 443 | groups[*grpcnt] = gid; |
| 444 | else |
| 445 | ret = 0; |
| 446 | |
| 447 | (*grpcnt)++; |
| 448 | |
| 449 | return ret; |
| 450 | } |
| 451 | |
| 452 | static int |
| 453 | getgroupmembership_fallback(void *retval __unused, void *mdata, va_list ap) |
| 454 | { |
| 455 | const ns_src src[] = { |
| 456 | { mdata, NS_SUCCESS }, |
| 457 | { NULL, 0} |
| 458 | }; |
| 459 | struct group grp; |
| 460 | struct group *grp_p; |
| 461 | char *buf; |
| 462 | size_t bufsize; |
| 463 | const char *uname; |
| 464 | gid_t *groups; |
| 465 | gid_t agroup; |
| 466 | int maxgrp, *grpcnt; |
| 467 | int i, rv, ret_errno; |
| 468 | |
| 469 | /* |
| 470 | * As this is a fallback method, only provided src |
| 471 | * list will be respected during methods search. |
| 472 | */ |
| 473 | assert(src[0].name != NULL); |
| 474 | |
| 475 | uname = va_arg(ap, const char *); |
| 476 | agroup = va_arg(ap, gid_t); |
| 477 | groups = va_arg(ap, gid_t *); |
| 478 | maxgrp = va_arg(ap, int); |
| 479 | grpcnt = va_arg(ap, int *); |
| 480 | |
| 481 | rv = NS_UNAVAIL; |
| 482 | |
| 483 | buf = malloc(GRP_STORAGE_INITIAL); |
| 484 | if (buf == NULL) |
| 485 | goto out; |
| 486 | |
| 487 | bufsize = GRP_STORAGE_INITIAL; |
| 488 | |
| 489 | gr_addgid(agroup, groups, maxgrp, grpcnt); |
| 490 | |
| 491 | _nsdispatch(NULL, setgrent_dtab, NSDB_GROUP, "setgrent", src, 0); |
| 492 | for (;;) { |
| 493 | do { |
| 494 | ret_errno = 0; |
| 495 | grp_p = NULL; |
| 496 | rv = _nsdispatch(&grp_p, getgrent_r_dtab, NSDB_GROUP, |
| 497 | "getgrent_r", src, &grp, buf, bufsize, &ret_errno); |
| 498 | |
| 499 | if (grp_p == NULL && ret_errno == ERANGE) { |
| 500 | free(buf); |
| 501 | if ((bufsize << 1) > GRP_STORAGE_MAX) { |
| 502 | buf = NULL; |
| 503 | errno = ERANGE; |
| 504 | goto out; |
| 505 | } |
| 506 | |
| 507 | bufsize <<= 1; |
| 508 | buf = malloc(bufsize); |
| 509 | if (buf == NULL) { |
| 510 | goto out; |
| 511 | } |
| 512 | } |
| 513 | } while (grp_p == NULL && ret_errno == ERANGE); |
| 514 | |
| 515 | if (ret_errno != 0) { |
| 516 | errno = ret_errno; |
| 517 | goto out; |
| 518 | } |
| 519 | |
| 520 | if (grp_p == NULL) |
| 521 | break; |
| 522 | |
| 523 | for (i = 0; grp.gr_mem[i]; i++) { |
| 524 | if (strcmp(grp.gr_mem[i], uname) == 0) |
| 525 | gr_addgid(grp.gr_gid, groups, maxgrp, grpcnt); |
| 526 | } |
| 527 | } |
| 528 | |
| 529 | _nsdispatch(NULL, endgrent_dtab, NSDB_GROUP, "endgrent", src); |
| 530 | out: |
| 531 | free(buf); |
| 532 | return (rv); |
| 533 | } |
| 534 | |
| 535 | void |
| 536 | setgrent(void) |
| 537 | { |
| 538 | _nsdispatch(NULL, setgrent_dtab, NSDB_GROUP, "setgrent", defaultsrc, 0); |
| 539 | } |
| 540 | |
| 541 | |
| 542 | int |
| 543 | setgroupent(int stayopen) |
| 544 | { |
| 545 | _nsdispatch(NULL, setgrent_dtab, NSDB_GROUP, "setgrent", defaultsrc, |
| 546 | stayopen); |
| 547 | return (1); |
| 548 | } |
| 549 | |
| 550 | |
| 551 | void |
| 552 | endgrent(void) |
| 553 | { |
| 554 | _nsdispatch(NULL, endgrent_dtab, NSDB_GROUP, "endgrent", defaultsrc); |
| 555 | } |
| 556 | |
| 557 | |
| 558 | int |
| 559 | getgrent_r(struct group *grp, char *buffer, size_t bufsize, |
| 560 | struct group **result) |
| 561 | { |
| 562 | int rv, ret_errno; |
| 563 | |
| 564 | ret_errno = 0; |
| 565 | *result = NULL; |
| 566 | rv = _nsdispatch(result, getgrent_r_dtab, NSDB_GROUP, "getgrent_r", defaultsrc, |
| 567 | grp, buffer, bufsize, &ret_errno); |
| 568 | if (rv == NS_SUCCESS) |
| 569 | return (0); |
| 570 | else |
| 571 | return (ret_errno); |
| 572 | } |
| 573 | |
| 574 | |
| 575 | int |
| 576 | getgrnam_r(const char *name, struct group *grp, char *buffer, size_t bufsize, |
| 577 | struct group **result) |
| 578 | { |
| 579 | #ifdef NS_CACHING |
| 580 | static const nss_cache_info cache_info = |
| 581 | NS_COMMON_CACHE_INFO_INITIALIZER( |
| 582 | group, (void *)nss_lt_name, |
| 583 | grp_id_func, grp_marshal_func, grp_unmarshal_func); |
| 584 | #endif |
| 585 | |
| 586 | static const ns_dtab dtab[] = { |
| 587 | { NSSRC_FILES, files_group, (void *)nss_lt_name }, |
| 588 | #ifdef HESIOD |
| 589 | { NSSRC_DNS, dns_group, (void *)nss_lt_name }, |
| 590 | #endif |
| 591 | #ifdef YP |
| 592 | { NSSRC_NIS, nis_group, (void *)nss_lt_name }, |
| 593 | #endif |
| 594 | { NSSRC_COMPAT, compat_group, (void *)nss_lt_name }, |
| 595 | #ifdef NS_CACHING |
| 596 | NS_CACHE_CB(&cache_info) |
| 597 | #endif |
| 598 | { NULL, NULL, NULL } |
| 599 | }; |
| 600 | int rv, ret_errno; |
| 601 | |
| 602 | ret_errno = 0; |
| 603 | *result = NULL; |
| 604 | rv = _nsdispatch(result, dtab, NSDB_GROUP, "getgrnam_r", defaultsrc, |
| 605 | name, grp, buffer, bufsize, &ret_errno); |
| 606 | if (rv == NS_SUCCESS) |
| 607 | return (0); |
| 608 | else |
| 609 | return (ret_errno); |
| 610 | } |
| 611 | |
| 612 | |
| 613 | int |
| 614 | getgrgid_r(gid_t gid, struct group *grp, char *buffer, size_t bufsize, |
| 615 | struct group **result) |
| 616 | { |
| 617 | #ifdef NS_CACHING |
| 618 | static const nss_cache_info cache_info = |
| 619 | NS_COMMON_CACHE_INFO_INITIALIZER( |
| 620 | group, (void *)nss_lt_id, |
| 621 | grp_id_func, grp_marshal_func, grp_unmarshal_func); |
| 622 | #endif |
| 623 | |
| 624 | static const ns_dtab dtab[] = { |
| 625 | { NSSRC_FILES, files_group, (void *)nss_lt_id }, |
| 626 | #ifdef HESIOD |
| 627 | { NSSRC_DNS, dns_group, (void *)nss_lt_id }, |
| 628 | #endif |
| 629 | #ifdef YP |
| 630 | { NSSRC_NIS, nis_group, (void *)nss_lt_id }, |
| 631 | #endif |
| 632 | { NSSRC_COMPAT, compat_group, (void *)nss_lt_id }, |
| 633 | #ifdef NS_CACHING |
| 634 | NS_CACHE_CB(&cache_info) |
| 635 | #endif |
| 636 | { NULL, NULL, NULL } |
| 637 | }; |
| 638 | int rv, ret_errno; |
| 639 | |
| 640 | ret_errno = 0; |
| 641 | *result = NULL; |
| 642 | rv = _nsdispatch(result, dtab, NSDB_GROUP, "getgrgid_r", defaultsrc, |
| 643 | gid, grp, buffer, bufsize, &ret_errno); |
| 644 | if (rv == NS_SUCCESS) |
| 645 | return (0); |
| 646 | else |
| 647 | return (ret_errno); |
| 648 | } |
| 649 | |
| 650 | |
| 651 | |
| 652 | int |
| 653 | __getgroupmembership(const char *uname, gid_t agroup, gid_t *groups, |
| 654 | int maxgrp, int *grpcnt) |
| 655 | { |
| 656 | static const ns_dtab dtab[] = { |
| 657 | NS_FALLBACK_CB(getgroupmembership_fallback) |
| 658 | { NULL, NULL, NULL } |
| 659 | }; |
| 660 | int rv __unused; |
| 661 | |
| 662 | assert(uname != NULL); |
| 663 | /* groups may be NULL if just sizing when invoked with maxgrp = 0 */ |
| 664 | assert(grpcnt != NULL); |
| 665 | |
| 666 | *grpcnt = 0; |
| 667 | rv = _nsdispatch(NULL, dtab, NSDB_GROUP, "getgroupmembership", |
| 668 | defaultsrc, uname, agroup, groups, maxgrp, grpcnt); |
| 669 | |
| 670 | /* too many groups found? */ |
| 671 | return (*grpcnt > maxgrp ? -1 : 0); |
| 672 | } |
| 673 | |
| 674 | |
| 675 | static struct group grp; |
| 676 | static char *grp_storage; |
| 677 | static size_t grp_storage_size; |
| 678 | |
| 679 | static struct group * |
| 680 | getgr(int (*fn)(union key, struct group *, char *, size_t, struct group **), |
| 681 | union key key) |
| 682 | { |
| 683 | int rv; |
| 684 | struct group *res; |
| 685 | |
| 686 | if (grp_storage == NULL) { |
| 687 | grp_storage = malloc(GRP_STORAGE_INITIAL); |
| 688 | if (grp_storage == NULL) |
| 689 | return (NULL); |
| 690 | grp_storage_size = GRP_STORAGE_INITIAL; |
| 691 | } |
| 692 | do { |
| 693 | rv = fn(key, &grp, grp_storage, grp_storage_size, &res); |
| 694 | if (res == NULL && rv == ERANGE) { |
| 695 | free(grp_storage); |
| 696 | if ((grp_storage_size << 1) > GRP_STORAGE_MAX) { |
| 697 | grp_storage = NULL; |
| 698 | errno = ERANGE; |
| 699 | return (NULL); |
| 700 | } |
| 701 | grp_storage_size <<= 1; |
| 702 | grp_storage = malloc(grp_storage_size); |
| 703 | if (grp_storage == NULL) |
| 704 | return (NULL); |
| 705 | } |
| 706 | } while (res == NULL && rv == ERANGE); |
| 707 | if (rv != 0) |
| 708 | errno = rv; |
| 709 | return (res); |
| 710 | } |
| 711 | |
| 712 | |
| 713 | static int |
| 714 | wrap_getgrnam_r(union key key, struct group *grp, char *buffer, size_t bufsize, |
| 715 | struct group **res) |
| 716 | { |
| 717 | return (getgrnam_r(key.name, grp, buffer, bufsize, res)); |
| 718 | } |
| 719 | |
| 720 | |
| 721 | static int |
| 722 | wrap_getgrgid_r(union key key, struct group *grp, char *buffer, size_t bufsize, |
| 723 | struct group **res) |
| 724 | { |
| 725 | return (getgrgid_r(key.gid, grp, buffer, bufsize, res)); |
| 726 | } |
| 727 | |
| 728 | |
| 729 | static int |
| 730 | wrap_getgrent_r(union key key __unused, struct group *grp, char *buffer, |
| 731 | size_t bufsize, struct group **res) |
| 732 | { |
| 733 | return (getgrent_r(grp, buffer, bufsize, res)); |
| 734 | } |
| 735 | |
| 736 | |
| 737 | struct group * |
| 738 | getgrnam(const char *name) |
| 739 | { |
| 740 | union key key; |
| 741 | |
| 742 | key.name = name; |
| 743 | return (getgr(wrap_getgrnam_r, key)); |
| 744 | } |
| 745 | |
| 746 | |
| 747 | struct group * |
| 748 | getgrgid(gid_t gid) |
| 749 | { |
| 750 | union key key; |
| 751 | |
| 752 | key.gid = gid; |
| 753 | return (getgr(wrap_getgrgid_r, key)); |
| 754 | } |
| 755 | |
| 756 | |
| 757 | struct group * |
| 758 | getgrent(void) |
| 759 | { |
| 760 | union key key; |
| 761 | |
| 762 | key.gid = 0; /* not used */ |
| 763 | return (getgr(wrap_getgrent_r, key)); |
| 764 | } |
| 765 | |
| 766 | |
| 767 | static int |
| 768 | is_comment_line(const char *s, size_t n) |
| 769 | { |
| 770 | const char *eom; |
| 771 | |
| 772 | eom = &s[n]; |
| 773 | |
| 774 | for (; s < eom; s++) |
| 775 | if (*s == '#' || !isspace((unsigned char)*s)) |
| 776 | break; |
| 777 | return (*s == '#' || s == eom); |
| 778 | } |
| 779 | |
| 780 | |
| 781 | /* |
| 782 | * files backend |
| 783 | */ |
| 784 | static void |
| 785 | files_endstate(void *p) |
| 786 | { |
| 787 | |
| 788 | if (p == NULL) |
| 789 | return; |
| 790 | if (((struct files_state *)p)->fp != NULL) |
| 791 | fclose(((struct files_state *)p)->fp); |
| 792 | free(p); |
| 793 | } |
| 794 | |
| 795 | |
| 796 | static int |
| 797 | files_setgrent(void *retval __unused, void *mdata, va_list ap) |
| 798 | { |
| 799 | struct files_state *st; |
| 800 | int rv, stayopen; |
| 801 | |
| 802 | rv = files_getstate(&st); |
| 803 | if (rv != 0) |
| 804 | return (NS_UNAVAIL); |
| 805 | switch ((enum constants)mdata) { |
| 806 | case SETGRENT: |
| 807 | stayopen = va_arg(ap, int); |
| 808 | if (st->fp != NULL) |
| 809 | rewind(st->fp); |
| 810 | else if (stayopen) |
| 811 | st->fp = fopen(_PATH_GROUP, "r"); |
| 812 | break; |
| 813 | case ENDGRENT: |
| 814 | if (st->fp != NULL) { |
| 815 | fclose(st->fp); |
| 816 | st->fp = NULL; |
| 817 | } |
| 818 | break; |
| 819 | default: |
| 820 | break; |
| 821 | } |
| 822 | return (NS_UNAVAIL); |
| 823 | } |
| 824 | |
| 825 | |
| 826 | static int |
| 827 | files_group(void *retval, void *mdata, va_list ap) |
| 828 | { |
| 829 | struct files_state *st; |
| 830 | enum nss_lookup_type how; |
| 831 | const char *name, *line; |
| 832 | struct group *grp; |
| 833 | gid_t gid; |
| 834 | char *buffer; |
| 835 | size_t bufsize, linesize; |
| 836 | off_t pos; |
| 837 | int rv, stayopen, *errnop; |
| 838 | |
| 839 | name = NULL; |
| 840 | gid = (gid_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 | gid = va_arg(ap, gid_t); |
| 848 | break; |
| 849 | case nss_lt_all: |
| 850 | break; |
| 851 | default: |
| 852 | return (NS_NOTFOUND); |
| 853 | } |
| 854 | grp = va_arg(ap, struct group *); |
| 855 | buffer = va_arg(ap, char *); |
| 856 | bufsize = va_arg(ap, size_t); |
| 857 | errnop = va_arg(ap, int *); |
| 858 | *errnop = files_getstate(&st); |
| 859 | if (*errnop != 0) |
| 860 | return (NS_UNAVAIL); |
| 861 | if (st->fp == NULL && |
| 862 | ((st->fp = fopen(_PATH_GROUP, "r")) == NULL)) { |
| 863 | *errnop = errno; |
| 864 | return (NS_UNAVAIL); |
| 865 | } |
| 866 | if (how == nss_lt_all) |
| 867 | stayopen = 1; |
| 868 | else { |
| 869 | rewind(st->fp); |
| 870 | stayopen = st->stayopen; |
| 871 | } |
| 872 | rv = NS_NOTFOUND; |
| 873 | pos = ftello(st->fp); |
| 874 | while ((line = fgetln(st->fp, &linesize)) != NULL) { |
| 875 | if (line[linesize-1] == '\n') |
| 876 | linesize--; |
| 877 | rv = __gr_match_entry(line, linesize, how, name, gid); |
| 878 | if (rv != NS_SUCCESS) |
| 879 | continue; |
| 880 | /* We need room at least for the line, a string NUL |
| 881 | * terminator, alignment padding, and one (char *) |
| 882 | * pointer for the member list terminator. |
| 883 | */ |
| 884 | if (bufsize <= linesize + _ALIGNBYTES + sizeof(char *)) { |
| 885 | *errnop = ERANGE; |
| 886 | rv = NS_RETURN; |
| 887 | break; |
| 888 | } |
| 889 | memcpy(buffer, line, linesize); |
| 890 | buffer[linesize] = '\0'; |
| 891 | rv = __gr_parse_entry(buffer, linesize, grp, |
| 892 | &buffer[linesize + 1], bufsize - linesize - 1, errnop); |
| 893 | if (rv & NS_TERMINATE) |
| 894 | break; |
| 895 | pos = ftello(st->fp); |
| 896 | } |
| 897 | if (!stayopen && st->fp != NULL) { |
| 898 | fclose(st->fp); |
| 899 | st->fp = NULL; |
| 900 | } |
| 901 | if (rv == NS_SUCCESS && retval != NULL) |
| 902 | *(struct group **)retval = grp; |
| 903 | else if (rv == NS_RETURN && *errnop == ERANGE && st->fp != NULL) |
| 904 | fseeko(st->fp, pos, SEEK_SET); |
| 905 | return (rv); |
| 906 | } |
| 907 | |
| 908 | |
| 909 | #ifdef HESIOD |
| 910 | /* |
| 911 | * dns backend |
| 912 | */ |
| 913 | static void |
| 914 | dns_endstate(void *p) |
| 915 | { |
| 916 | |
| 917 | free(p); |
| 918 | } |
| 919 | |
| 920 | |
| 921 | static int |
| 922 | dns_setgrent(void *retval __unused, void *cb_data __unused, va_list ap __unused) |
| 923 | { |
| 924 | struct dns_state *st; |
| 925 | int rv; |
| 926 | |
| 927 | rv = dns_getstate(&st); |
| 928 | if (rv != 0) |
| 929 | return (NS_UNAVAIL); |
| 930 | st->counter = 0; |
| 931 | return (NS_UNAVAIL); |
| 932 | } |
| 933 | |
| 934 | |
| 935 | static int |
| 936 | dns_group(void *retval, void *mdata, va_list ap) |
| 937 | { |
| 938 | char buf[HESIOD_NAME_MAX]; |
| 939 | struct dns_state *st; |
| 940 | struct group *grp; |
| 941 | const char *name, *label; |
| 942 | void *ctx; |
| 943 | char *buffer, **hes; |
| 944 | size_t bufsize, adjsize, linesize; |
| 945 | gid_t gid; |
| 946 | enum nss_lookup_type how; |
| 947 | int rv, *errnop; |
| 948 | |
| 949 | ctx = NULL; |
| 950 | hes = NULL; |
| 951 | name = NULL; |
| 952 | gid = (gid_t)-1; |
| 953 | how = (enum nss_lookup_type)mdata; |
| 954 | switch (how) { |
| 955 | case nss_lt_name: |
| 956 | name = va_arg(ap, const char *); |
| 957 | break; |
| 958 | case nss_lt_id: |
| 959 | gid = va_arg(ap, gid_t); |
| 960 | break; |
| 961 | case nss_lt_all: |
| 962 | break; |
| 963 | } |
| 964 | grp = va_arg(ap, struct group *); |
| 965 | buffer = va_arg(ap, char *); |
| 966 | bufsize = va_arg(ap, size_t); |
| 967 | errnop = va_arg(ap, int *); |
| 968 | *errnop = dns_getstate(&st); |
| 969 | if (*errnop != 0) |
| 970 | return (NS_UNAVAIL); |
| 971 | if (hesiod_init(&ctx) != 0) { |
| 972 | *errnop = errno; |
| 973 | rv = NS_UNAVAIL; |
| 974 | goto fin; |
| 975 | } |
| 976 | do { |
| 977 | rv = NS_NOTFOUND; |
| 978 | switch (how) { |
| 979 | case nss_lt_name: |
| 980 | label = name; |
| 981 | break; |
| 982 | case nss_lt_id: |
| 983 | if (snprintf(buf, sizeof(buf), "%lu", |
| 984 | (unsigned long)gid) >= sizeof(buf)) |
| 985 | goto fin; |
| 986 | label = buf; |
| 987 | break; |
| 988 | case nss_lt_all: |
| 989 | if (st->counter < 0) |
| 990 | goto fin; |
| 991 | if (snprintf(buf, sizeof(buf), "group-%ld", |
| 992 | st->counter++) >= sizeof(buf)) |
| 993 | goto fin; |
| 994 | label = buf; |
| 995 | break; |
| 996 | } |
| 997 | hes = hesiod_resolve(ctx, label, |
| 998 | how == nss_lt_id ? "gid" : "group"); |
| 999 | if ((how == nss_lt_id && hes == NULL && |
| 1000 | (hes = hesiod_resolve(ctx, buf, "group")) == NULL) || |
| 1001 | hes == NULL) { |
| 1002 | if (how == nss_lt_all) |
| 1003 | st->counter = -1; |
| 1004 | if (errno != ENOENT) |
| 1005 | *errnop = errno; |
| 1006 | goto fin; |
| 1007 | } |
| 1008 | rv = __gr_match_entry(hes[0], strlen(hes[0]), how, name, gid); |
| 1009 | if (rv != NS_SUCCESS) { |
| 1010 | hesiod_free_list(ctx, hes); |
| 1011 | hes = NULL; |
| 1012 | continue; |
| 1013 | } |
| 1014 | /* We need room at least for the line, a string NUL |
| 1015 | * terminator, alignment padding, and one (char *) |
| 1016 | * pointer for the member list terminator. |
| 1017 | */ |
| 1018 | adjsize = bufsize - _ALIGNBYTES - sizeof(char *); |
| 1019 | linesize = strlcpy(buffer, hes[0], adjsize); |
| 1020 | if (linesize >= adjsize) { |
| 1021 | *errnop = ERANGE; |
| 1022 | rv = NS_RETURN; |
| 1023 | goto fin; |
| 1024 | } |
| 1025 | hesiod_free_list(ctx, hes); |
| 1026 | hes = NULL; |
| 1027 | rv = __gr_parse_entry(buffer, linesize, grp, |
| 1028 | &buffer[linesize + 1], bufsize - linesize - 1, errnop); |
| 1029 | } while (how == nss_lt_all && !(rv & NS_TERMINATE)); |
| 1030 | fin: |
| 1031 | if (hes != NULL) |
| 1032 | hesiod_free_list(ctx, hes); |
| 1033 | if (ctx != NULL) |
| 1034 | hesiod_end(ctx); |
| 1035 | if (rv == NS_SUCCESS && retval != NULL) |
| 1036 | *(struct group **)retval = grp; |
| 1037 | return (rv); |
| 1038 | } |
| 1039 | #endif /* HESIOD */ |
| 1040 | |
| 1041 | |
| 1042 | #ifdef YP |
| 1043 | /* |
| 1044 | * nis backend |
| 1045 | */ |
| 1046 | static void |
| 1047 | nis_endstate(void *p) |
| 1048 | { |
| 1049 | |
| 1050 | if (p == NULL) |
| 1051 | return; |
| 1052 | free(((struct nis_state *)p)->key); |
| 1053 | free(p); |
| 1054 | } |
| 1055 | |
| 1056 | |
| 1057 | static int |
| 1058 | nis_setgrent(void *retval __unused, void *cb_data __unused, va_list ap __unused) |
| 1059 | { |
| 1060 | struct nis_state *st; |
| 1061 | int rv; |
| 1062 | |
| 1063 | rv = nis_getstate(&st); |
| 1064 | if (rv != 0) |
| 1065 | return (NS_UNAVAIL); |
| 1066 | st->done = 0; |
| 1067 | free(st->key); |
| 1068 | st->key = NULL; |
| 1069 | return (NS_UNAVAIL); |
| 1070 | } |
| 1071 | |
| 1072 | |
| 1073 | static int |
| 1074 | nis_group(void *retval, void *mdata, va_list ap) |
| 1075 | { |
| 1076 | char *map; |
| 1077 | struct nis_state *st; |
| 1078 | struct group *grp; |
| 1079 | const char *name; |
| 1080 | char *buffer, *key, *result; |
| 1081 | size_t bufsize; |
| 1082 | gid_t gid; |
| 1083 | enum nss_lookup_type how; |
| 1084 | int *errnop, keylen, resultlen, rv; |
| 1085 | |
| 1086 | name = NULL; |
| 1087 | gid = (gid_t)-1; |
| 1088 | how = (enum nss_lookup_type)mdata; |
| 1089 | switch (how) { |
| 1090 | case nss_lt_name: |
| 1091 | name = va_arg(ap, const char *); |
| 1092 | map = "group.byname"; |
| 1093 | break; |
| 1094 | case nss_lt_id: |
| 1095 | gid = va_arg(ap, gid_t); |
| 1096 | map = "group.bygid"; |
| 1097 | break; |
| 1098 | case nss_lt_all: |
| 1099 | map = "group.byname"; |
| 1100 | break; |
| 1101 | } |
| 1102 | grp = va_arg(ap, struct group *); |
| 1103 | buffer = va_arg(ap, char *); |
| 1104 | bufsize = va_arg(ap, size_t); |
| 1105 | errnop = va_arg(ap, int *); |
| 1106 | *errnop = nis_getstate(&st); |
| 1107 | if (*errnop != 0) |
| 1108 | return (NS_UNAVAIL); |
| 1109 | if (st->domain[0] == '\0') { |
| 1110 | if (getdomainname(st->domain, sizeof(st->domain)) != 0) { |
| 1111 | *errnop = errno; |
| 1112 | return (NS_UNAVAIL); |
| 1113 | } |
| 1114 | } |
| 1115 | result = NULL; |
| 1116 | do { |
| 1117 | rv = NS_NOTFOUND; |
| 1118 | switch (how) { |
| 1119 | case nss_lt_name: |
| 1120 | if (strlcpy(buffer, name, bufsize) >= bufsize) |
| 1121 | goto erange; |
| 1122 | break; |
| 1123 | case nss_lt_id: |
| 1124 | if (snprintf(buffer, bufsize, "%lu", |
| 1125 | (unsigned long)gid) >= bufsize) |
| 1126 | goto erange; |
| 1127 | break; |
| 1128 | case nss_lt_all: |
| 1129 | if (st->done) |
| 1130 | goto fin; |
| 1131 | break; |
| 1132 | } |
| 1133 | result = NULL; |
| 1134 | if (how == nss_lt_all) { |
| 1135 | if (st->key == NULL) |
| 1136 | rv = yp_first(st->domain, map, &st->key, |
| 1137 | &st->keylen, &result, &resultlen); |
| 1138 | else { |
| 1139 | key = st->key; |
| 1140 | keylen = st->keylen; |
| 1141 | st->key = NULL; |
| 1142 | rv = yp_next(st->domain, map, key, keylen, |
| 1143 | &st->key, &st->keylen, &result, |
| 1144 | &resultlen); |
| 1145 | free(key); |
| 1146 | } |
| 1147 | if (rv != 0) { |
| 1148 | free(result); |
| 1149 | free(st->key); |
| 1150 | st->key = NULL; |
| 1151 | if (rv == YPERR_NOMORE) { |
| 1152 | st->done = 1; |
| 1153 | rv = NS_NOTFOUND; |
| 1154 | } else |
| 1155 | rv = NS_UNAVAIL; |
| 1156 | goto fin; |
| 1157 | } |
| 1158 | } else { |
| 1159 | rv = yp_match(st->domain, map, buffer, strlen(buffer), |
| 1160 | &result, &resultlen); |
| 1161 | if (rv == YPERR_KEY) { |
| 1162 | rv = NS_NOTFOUND; |
| 1163 | continue; |
| 1164 | } else if (rv != 0) { |
| 1165 | free(result); |
| 1166 | rv = NS_UNAVAIL; |
| 1167 | continue; |
| 1168 | } |
| 1169 | } |
| 1170 | /* We need room at least for the line, a string NUL |
| 1171 | * terminator, alignment padding, and one (char *) |
| 1172 | * pointer for the member list terminator. |
| 1173 | */ |
| 1174 | if (resultlen >= bufsize - _ALIGNBYTES - sizeof(char *)) |
| 1175 | goto erange; |
| 1176 | memcpy(buffer, result, resultlen); |
| 1177 | buffer[resultlen] = '\0'; |
| 1178 | free(result); |
| 1179 | rv = __gr_match_entry(buffer, resultlen, how, name, gid); |
| 1180 | if (rv == NS_SUCCESS) |
| 1181 | rv = __gr_parse_entry(buffer, resultlen, grp, |
| 1182 | &buffer[resultlen+1], bufsize - resultlen - 1, |
| 1183 | errnop); |
| 1184 | } while (how == nss_lt_all && !(rv & NS_TERMINATE)); |
| 1185 | fin: |
| 1186 | if (rv == NS_SUCCESS && retval != NULL) |
| 1187 | *(struct group **)retval = grp; |
| 1188 | return (rv); |
| 1189 | erange: |
| 1190 | *errnop = ERANGE; |
| 1191 | return (NS_RETURN); |
| 1192 | } |
| 1193 | #endif /* YP */ |
| 1194 | |
| 1195 | |
| 1196 | |
| 1197 | /* |
| 1198 | * compat backend |
| 1199 | */ |
| 1200 | static void |
| 1201 | compat_endstate(void *p) |
| 1202 | { |
| 1203 | struct compat_state *st; |
| 1204 | |
| 1205 | if (p == NULL) |
| 1206 | return; |
| 1207 | st = (struct compat_state *)p; |
| 1208 | free(st->name); |
| 1209 | if (st->fp != NULL) |
| 1210 | fclose(st->fp); |
| 1211 | free(p); |
| 1212 | } |
| 1213 | |
| 1214 | |
| 1215 | static int |
| 1216 | compat_setgrent(void *retval __unused, void *mdata, va_list ap) |
| 1217 | { |
| 1218 | static const ns_src compatsrc[] = { |
| 1219 | #ifdef YP |
| 1220 | { NSSRC_NIS, NS_SUCCESS }, |
| 1221 | #endif |
| 1222 | { NULL, 0 } |
| 1223 | }; |
| 1224 | ns_dtab dtab[] = { |
| 1225 | #ifdef HESIOD |
| 1226 | { NSSRC_DNS, dns_setgrent, NULL }, |
| 1227 | #endif |
| 1228 | #ifdef YP |
| 1229 | { NSSRC_NIS, nis_setgrent, NULL }, |
| 1230 | #endif |
| 1231 | { NULL, NULL, NULL } |
| 1232 | }; |
| 1233 | struct compat_state *st; |
| 1234 | int rv, stayopen; |
| 1235 | |
| 1236 | #define set_setent(x, y) do { \ |
| 1237 | int i; \ |
| 1238 | \ |
| 1239 | for (i = 0; i < (sizeof(x)/sizeof(x[0])) - 1; i++) \ |
| 1240 | x[i].mdata = (void *)y; \ |
| 1241 | } while (0) |
| 1242 | |
| 1243 | rv = compat_getstate(&st); |
| 1244 | if (rv != 0) |
| 1245 | return (NS_UNAVAIL); |
| 1246 | switch ((enum constants)mdata) { |
| 1247 | case SETGRENT: |
| 1248 | stayopen = va_arg(ap, int); |
| 1249 | if (st->fp != NULL) |
| 1250 | rewind(st->fp); |
| 1251 | else if (stayopen) |
| 1252 | st->fp = fopen(_PATH_GROUP, "r"); |
| 1253 | set_setent(dtab, mdata); |
| 1254 | _nsdispatch(NULL, dtab, NSDB_GROUP_COMPAT, "setgrent", |
| 1255 | compatsrc, 0); |
| 1256 | break; |
| 1257 | case ENDGRENT: |
| 1258 | if (st->fp != NULL) { |
| 1259 | fclose(st->fp); |
| 1260 | st->fp = NULL; |
| 1261 | } |
| 1262 | set_setent(dtab, mdata); |
| 1263 | _nsdispatch(NULL, dtab, NSDB_GROUP_COMPAT, "endgrent", |
| 1264 | compatsrc, 0); |
| 1265 | break; |
| 1266 | default: |
| 1267 | break; |
| 1268 | } |
| 1269 | st->compat = COMPAT_MODE_OFF; |
| 1270 | free(st->name); |
| 1271 | st->name = NULL; |
| 1272 | return (NS_UNAVAIL); |
| 1273 | #undef set_setent |
| 1274 | } |
| 1275 | |
| 1276 | |
| 1277 | static int |
| 1278 | compat_group(void *retval, void *mdata, va_list ap) |
| 1279 | { |
| 1280 | static const ns_src compatsrc[] = { |
| 1281 | #ifdef YP |
| 1282 | { NSSRC_NIS, NS_SUCCESS }, |
| 1283 | #endif |
| 1284 | { NULL, 0 } |
| 1285 | }; |
| 1286 | ns_dtab dtab[] = { |
| 1287 | #ifdef YP |
| 1288 | { NSSRC_NIS, nis_group, NULL }, |
| 1289 | #endif |
| 1290 | #ifdef HESIOD |
| 1291 | { NSSRC_DNS, dns_group, NULL }, |
| 1292 | #endif |
| 1293 | { NULL, NULL, NULL } |
| 1294 | }; |
| 1295 | struct compat_state *st; |
| 1296 | enum nss_lookup_type how; |
| 1297 | const char *name, *line; |
| 1298 | struct group *grp; |
| 1299 | gid_t gid; |
| 1300 | char *buffer, *p; |
| 1301 | void *discard; |
| 1302 | size_t bufsize, linesize; |
| 1303 | off_t pos; |
| 1304 | int rv, stayopen, *errnop; |
| 1305 | |
| 1306 | #define set_lookup_type(x, y) do { \ |
| 1307 | int i; \ |
| 1308 | \ |
| 1309 | for (i = 0; i < (sizeof(x)/sizeof(x[0])) - 1; i++) \ |
| 1310 | x[i].mdata = (void *)y; \ |
| 1311 | } while (0) |
| 1312 | |
| 1313 | name = NULL; |
| 1314 | gid = (gid_t)-1; |
| 1315 | how = (enum nss_lookup_type)mdata; |
| 1316 | switch (how) { |
| 1317 | case nss_lt_name: |
| 1318 | name = va_arg(ap, const char *); |
| 1319 | break; |
| 1320 | case nss_lt_id: |
| 1321 | gid = va_arg(ap, gid_t); |
| 1322 | break; |
| 1323 | case nss_lt_all: |
| 1324 | break; |
| 1325 | default: |
| 1326 | return (NS_NOTFOUND); |
| 1327 | } |
| 1328 | grp = va_arg(ap, struct group *); |
| 1329 | buffer = va_arg(ap, char *); |
| 1330 | bufsize = va_arg(ap, size_t); |
| 1331 | errnop = va_arg(ap, int *); |
| 1332 | *errnop = compat_getstate(&st); |
| 1333 | if (*errnop != 0) |
| 1334 | return (NS_UNAVAIL); |
| 1335 | if (st->fp == NULL && |
| 1336 | ((st->fp = fopen(_PATH_GROUP, "r")) == NULL)) { |
| 1337 | *errnop = errno; |
| 1338 | rv = NS_UNAVAIL; |
| 1339 | goto fin; |
| 1340 | } |
| 1341 | if (how == nss_lt_all) |
| 1342 | stayopen = 1; |
| 1343 | else { |
| 1344 | rewind(st->fp); |
| 1345 | stayopen = st->stayopen; |
| 1346 | } |
| 1347 | docompat: |
| 1348 | switch (st->compat) { |
| 1349 | case COMPAT_MODE_ALL: |
| 1350 | set_lookup_type(dtab, how); |
| 1351 | switch (how) { |
| 1352 | case nss_lt_all: |
| 1353 | rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT, |
| 1354 | "getgrent_r", compatsrc, grp, buffer, bufsize, |
| 1355 | errnop); |
| 1356 | break; |
| 1357 | case nss_lt_id: |
| 1358 | rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT, |
| 1359 | "getgrgid_r", compatsrc, gid, grp, buffer, bufsize, |
| 1360 | errnop); |
| 1361 | break; |
| 1362 | case nss_lt_name: |
| 1363 | rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT, |
| 1364 | "getgrnam_r", compatsrc, name, grp, buffer, |
| 1365 | bufsize, errnop); |
| 1366 | break; |
| 1367 | } |
| 1368 | if (rv & NS_TERMINATE) |
| 1369 | goto fin; |
| 1370 | st->compat = COMPAT_MODE_OFF; |
| 1371 | break; |
| 1372 | case COMPAT_MODE_NAME: |
| 1373 | set_lookup_type(dtab, nss_lt_name); |
| 1374 | rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT, |
| 1375 | "getgrnam_r", compatsrc, st->name, grp, buffer, bufsize, |
| 1376 | errnop); |
| 1377 | switch (rv) { |
| 1378 | case NS_SUCCESS: |
| 1379 | switch (how) { |
| 1380 | case nss_lt_name: |
| 1381 | if (strcmp(name, grp->gr_name) != 0) |
| 1382 | rv = NS_NOTFOUND; |
| 1383 | break; |
| 1384 | case nss_lt_id: |
| 1385 | if (gid != grp->gr_gid) |
| 1386 | rv = NS_NOTFOUND; |
| 1387 | break; |
| 1388 | default: |
| 1389 | break; |
| 1390 | } |
| 1391 | break; |
| 1392 | case NS_RETURN: |
| 1393 | goto fin; |
| 1394 | default: |
| 1395 | break; |
| 1396 | } |
| 1397 | free(st->name); |
| 1398 | st->name = NULL; |
| 1399 | st->compat = COMPAT_MODE_OFF; |
| 1400 | if (rv == NS_SUCCESS) |
| 1401 | goto fin; |
| 1402 | break; |
| 1403 | default: |
| 1404 | break; |
| 1405 | } |
| 1406 | rv = NS_NOTFOUND; |
| 1407 | pos = ftello(st->fp); |
| 1408 | while ((line = fgetln(st->fp, &linesize)) != NULL) { |
| 1409 | if (line[linesize-1] == '\n') |
| 1410 | linesize--; |
| 1411 | if (linesize > 2 && line[0] == '+') { |
| 1412 | p = memchr(&line[1], ':', linesize); |
| 1413 | if (p == NULL || p == &line[1]) |
| 1414 | st->compat = COMPAT_MODE_ALL; |
| 1415 | else { |
| 1416 | st->name = malloc(p - line); |
| 1417 | if (st->name == NULL) { |
| 1418 | syslog(LOG_ERR, |
| 1419 | "getgrent memory allocation failure"); |
| 1420 | *errnop = ENOMEM; |
| 1421 | rv = NS_UNAVAIL; |
| 1422 | break; |
| 1423 | } |
| 1424 | memcpy(st->name, &line[1], p - line - 1); |
| 1425 | st->name[p - line - 1] = '\0'; |
| 1426 | st->compat = COMPAT_MODE_NAME; |
| 1427 | } |
| 1428 | goto docompat; |
| 1429 | } |
| 1430 | rv = __gr_match_entry(line, linesize, how, name, gid); |
| 1431 | if (rv != NS_SUCCESS) |
| 1432 | continue; |
| 1433 | /* We need room at least for the line, a string NUL |
| 1434 | * terminator, alignment padding, and one (char *) |
| 1435 | * pointer for the member list terminator. |
| 1436 | */ |
| 1437 | if (bufsize <= linesize + _ALIGNBYTES + sizeof(char *)) { |
| 1438 | *errnop = ERANGE; |
| 1439 | rv = NS_RETURN; |
| 1440 | break; |
| 1441 | } |
| 1442 | memcpy(buffer, line, linesize); |
| 1443 | buffer[linesize] = '\0'; |
| 1444 | rv = __gr_parse_entry(buffer, linesize, grp, |
| 1445 | &buffer[linesize + 1], bufsize - linesize - 1, errnop); |
| 1446 | if (rv & NS_TERMINATE) |
| 1447 | break; |
| 1448 | pos = ftello(st->fp); |
| 1449 | } |
| 1450 | fin: |
| 1451 | if (!stayopen && st->fp != NULL) { |
| 1452 | fclose(st->fp); |
| 1453 | st->fp = NULL; |
| 1454 | } |
| 1455 | if (rv == NS_SUCCESS && retval != NULL) |
| 1456 | *(struct group **)retval = grp; |
| 1457 | else if (rv == NS_RETURN && *errnop == ERANGE && st->fp != NULL) |
| 1458 | fseeko(st->fp, pos, SEEK_SET); |
| 1459 | return (rv); |
| 1460 | #undef set_lookup_type |
| 1461 | } |
| 1462 | |
| 1463 | |
| 1464 | /* |
| 1465 | * common group line matching and parsing |
| 1466 | */ |
| 1467 | int |
| 1468 | __gr_match_entry(const char *line, size_t linesize, enum nss_lookup_type how, |
| 1469 | const char *name, gid_t gid) |
| 1470 | { |
| 1471 | size_t namesize; |
| 1472 | const char *p, *eol; |
| 1473 | char *q; |
| 1474 | unsigned long n; |
| 1475 | int i, needed; |
| 1476 | |
| 1477 | if (linesize == 0 || is_comment_line(line, linesize)) |
| 1478 | return (NS_NOTFOUND); |
| 1479 | switch (how) { |
| 1480 | case nss_lt_name: needed = 1; break; |
| 1481 | case nss_lt_id: needed = 2; break; |
| 1482 | default: needed = 2; break; |
| 1483 | } |
| 1484 | eol = &line[linesize]; |
| 1485 | for (p = line, i = 0; i < needed && p < eol; p++) |
| 1486 | if (*p == ':') |
| 1487 | i++; |
| 1488 | if (i < needed) |
| 1489 | return (NS_NOTFOUND); |
| 1490 | switch (how) { |
| 1491 | case nss_lt_name: |
| 1492 | namesize = strlen(name); |
| 1493 | if (namesize + 1 == (size_t)(p - line) && |
| 1494 | memcmp(line, name, namesize) == 0) |
| 1495 | return (NS_SUCCESS); |
| 1496 | break; |
| 1497 | case nss_lt_id: |
| 1498 | n = strtoul(p, &q, 10); |
| 1499 | if (q < eol && *q == ':' && gid == (gid_t)n) |
| 1500 | return (NS_SUCCESS); |
| 1501 | break; |
| 1502 | case nss_lt_all: |
| 1503 | return (NS_SUCCESS); |
| 1504 | default: |
| 1505 | break; |
| 1506 | } |
| 1507 | return (NS_NOTFOUND); |
| 1508 | } |
| 1509 | |
| 1510 | |
| 1511 | int |
| 1512 | __gr_parse_entry(char *line, size_t linesize __unused, struct group *grp, |
| 1513 | char *membuf, size_t membufsize, int *errnop) |
| 1514 | { |
| 1515 | char *s_gid, *s_mem, *p, **members; |
| 1516 | unsigned long n; |
| 1517 | int maxmembers; |
| 1518 | |
| 1519 | memset(grp, 0, sizeof(*grp)); |
| 1520 | members = (char **)_ALIGN(membuf); |
| 1521 | membufsize -= (char *)members - membuf; |
| 1522 | maxmembers = membufsize / sizeof(*members); |
| 1523 | if (maxmembers <= 0 || |
| 1524 | (grp->gr_name = strsep(&line, ":")) == NULL || |
| 1525 | grp->gr_name[0] == '\0' || |
| 1526 | (grp->gr_passwd = strsep(&line, ":")) == NULL || |
| 1527 | (s_gid = strsep(&line, ":")) == NULL || |
| 1528 | s_gid[0] == '\0') |
| 1529 | return (NS_NOTFOUND); |
| 1530 | s_mem = line; |
| 1531 | n = strtoul(s_gid, &s_gid, 10); |
| 1532 | if (s_gid[0] != '\0') |
| 1533 | return (NS_NOTFOUND); |
| 1534 | grp->gr_gid = (gid_t)n; |
| 1535 | grp->gr_mem = members; |
| 1536 | while (maxmembers > 1 && s_mem != NULL) { |
| 1537 | p = strsep(&s_mem, ","); |
| 1538 | if (p != NULL && *p != '\0') { |
| 1539 | *members++ = p; |
| 1540 | maxmembers--; |
| 1541 | } |
| 1542 | } |
| 1543 | *members = NULL; |
| 1544 | if (s_mem == NULL) |
| 1545 | return (NS_SUCCESS); |
| 1546 | else { |
| 1547 | *errnop = ERANGE; |
| 1548 | return (NS_RETURN); |
| 1549 | } |
| 1550 | } |