1 /* $OpenBSD: ypldap.c,v 1.10 2011/08/28 11:53:16 aschrijver Exp $ */ 2 3 /* 4 * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 #include <sys/param.h> 21 #include <sys/queue.h> 22 #include <sys/socket.h> 23 #include <sys/tree.h> 24 #include <sys/wait.h> 25 26 #include <netinet/in.h> 27 #include <arpa/inet.h> 28 29 #include <err.h> 30 #include <event.h> 31 #include <fcntl.h> 32 #include <unistd.h> 33 #include <pwd.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 38 #include "ypldap.h" 39 40 __dead void usage(void); 41 int check_child(pid_t, const char *); 42 void main_sig_handler(int, short, void *); 43 void main_shutdown(void); 44 void main_dispatch_client(int, short, void *); 45 void main_configure_client(struct env *); 46 void main_init_timer(int, short, void *); 47 void main_start_update(struct env *); 48 void main_trash_update(struct env *); 49 void main_end_update(struct env *); 50 int main_create_user_groups(struct env *); 51 void purge_config(struct env *); 52 void reconfigure(struct env *); 53 void set_nonblock(int); 54 55 int pipe_main2client[2]; 56 57 pid_t client_pid = 0; 58 char *conffile = YPLDAP_CONF_FILE; 59 int opts = 0; 60 61 void 62 usage(void) 63 { 64 extern const char *__progname; 65 66 fprintf(stderr, "usage: %s [-dnv] [-D macro=value] [-f file]\n", 67 __progname); 68 exit(1); 69 } 70 71 int 72 check_child(pid_t pid, const char *pname) 73 { 74 int status; 75 76 if (waitpid(pid, &status, WNOHANG) > 0) { 77 if (WIFEXITED(status)) { 78 log_warnx("check_child: lost child %s exited", pname); 79 return (1); 80 } 81 if (WIFSIGNALED(status)) { 82 log_warnx("check_child: lost child %s terminated; " 83 "signal %d", pname, WTERMSIG(status)); 84 return (1); 85 } 86 } 87 return (0); 88 } 89 90 /* ARGUSED */ 91 void 92 main_sig_handler(int sig, short event, void *p) 93 { 94 int die = 0; 95 96 switch (sig) { 97 case SIGTERM: 98 case SIGINT: 99 die = 1; 100 /* FALLTHROUGH */ 101 case SIGCHLD: 102 if (check_child(client_pid, "ldap client")) { 103 client_pid = 0; 104 die = 1; 105 } 106 if (die) 107 main_shutdown(); 108 break; 109 case SIGHUP: 110 /* reconfigure */ 111 break; 112 default: 113 fatalx("unexpected signal"); 114 } 115 } 116 117 void 118 main_shutdown(void) 119 { 120 _exit(0); 121 } 122 123 void 124 main_start_update(struct env *env) 125 { 126 env->update_trashed = 0; 127 128 log_debug("starting directory update"); 129 env->sc_user_line_len = 0; 130 env->sc_group_line_len = 0; 131 if ((env->sc_user_names_t = calloc(1, 132 sizeof(*env->sc_user_names_t))) == NULL || 133 (env->sc_group_names_t = calloc(1, 134 sizeof(*env->sc_group_names_t))) == NULL) 135 fatal(NULL); 136 RB_INIT(env->sc_user_names_t); 137 RB_INIT(env->sc_group_names_t); 138 } 139 140 /* 141 * XXX: Currently this function should only be called when updating is 142 * finished. A notification should be send to ldapclient that it should stop 143 * sending new pwd/grp entries before it can be called from different places. 144 */ 145 void 146 main_trash_update(struct env *env) 147 { 148 struct userent *ue; 149 struct groupent *ge; 150 151 env->update_trashed = 1; 152 153 while ((ue = RB_ROOT(env->sc_user_names_t)) != NULL) { 154 RB_REMOVE(user_name_tree, 155 env->sc_user_names_t, ue); 156 free(ue->ue_line); 157 free(ue->ue_netid_line); 158 free(ue); 159 } 160 free(env->sc_user_names_t); 161 env->sc_user_names_t = NULL; 162 while ((ge = RB_ROOT(env->sc_group_names_t)) 163 != NULL) { 164 RB_REMOVE(group_name_tree, 165 env->sc_group_names_t, ge); 166 free(ge->ge_line); 167 free(ge); 168 } 169 free(env->sc_group_names_t); 170 env->sc_group_names_t = NULL; 171 } 172 173 int 174 main_create_user_groups(struct env *env) 175 { 176 struct userent *ue; 177 struct userent ukey; 178 struct groupent *ge; 179 gid_t pw_gid; 180 char *bp, *cp; 181 char *p; 182 const char *errstr = NULL; 183 size_t len; 184 185 RB_FOREACH(ue, user_name_tree, env->sc_user_names_t) { 186 bp = cp = ue->ue_line; 187 188 /* name */ 189 bp += strlen(bp) + 1; 190 191 /* password */ 192 bp += strcspn(bp, ":") + 1; 193 194 /* uid */ 195 bp += strcspn(bp, ":") + 1; 196 197 /* gid */ 198 bp[strcspn(bp, ":")] = '\0'; 199 200 pw_gid = (gid_t)strtonum(bp, 0, GID_MAX, &errstr); 201 if (errstr) { 202 log_warnx("main: failed to parse gid for uid: %d\n", ue->ue_uid); 203 return (-1); 204 } 205 206 /* bring gid column back to its proper state */ 207 bp[strlen(bp)] = ':'; 208 209 if ((ue->ue_netid_line = calloc(1, LINE_WIDTH)) == NULL) { 210 return (-1); 211 } 212 213 if (snprintf(ue->ue_netid_line, LINE_WIDTH-1, "%d:%d", ue->ue_uid, pw_gid) >= LINE_WIDTH) { 214 215 return (-1); 216 } 217 218 ue->ue_gid = pw_gid; 219 } 220 221 RB_FOREACH(ge, group_name_tree, env->sc_group_names_t) { 222 bp = cp = ge->ge_line; 223 224 /* name */ 225 bp += strlen(bp) + 1; 226 227 /* password */ 228 bp += strcspn(bp, ":") + 1; 229 230 /* gid */ 231 bp += strcspn(bp, ":") + 1; 232 233 cp = bp; 234 if (*bp == '\0') 235 continue; 236 bp = cp; 237 for (;;) { 238 if (!(cp = strsep(&bp, ","))) 239 break; 240 ukey.ue_line = cp; 241 if ((ue = RB_FIND(user_name_tree, env->sc_user_names_t, 242 &ukey)) == NULL) { 243 /* User not found */ 244 log_warnx("main: user: %s is referenced as a " 245 "group member, but can't be found in the " 246 "users map.\n", ukey.ue_line); 247 if (bp != NULL) 248 *(bp-1) = ','; 249 return (-1); 250 } 251 if (bp != NULL) 252 *(bp-1) = ','; 253 254 /* Make sure the new group doesn't equal to the main gid */ 255 if (ge->ge_gid == ue->ue_gid) 256 continue; 257 258 len = strlen(ue->ue_netid_line); 259 p = ue->ue_netid_line + len; 260 261 if ((snprintf(p, LINE_WIDTH-len-1, ",%d", 262 ge->ge_gid)) >= (int)(LINE_WIDTH-len)) { 263 return (-1); 264 } 265 } 266 } 267 268 return (0); 269 } 270 271 void 272 main_end_update(struct env *env) 273 { 274 struct userent *ue; 275 struct groupent *ge; 276 277 if (env->update_trashed) 278 return; 279 280 log_debug("updates are over, cleaning up trees now"); 281 282 if (main_create_user_groups(env) == -1) { 283 main_trash_update(env); 284 return; 285 } 286 287 if (env->sc_user_names == NULL) { 288 env->sc_user_names = env->sc_user_names_t; 289 env->sc_user_lines = NULL; 290 env->sc_user_names_t = NULL; 291 292 env->sc_group_names = env->sc_group_names_t; 293 env->sc_group_lines = NULL; 294 env->sc_group_names_t = NULL; 295 296 flatten_entries(env); 297 goto make_uids; 298 } 299 300 /* 301 * clean previous tree. 302 */ 303 while ((ue = RB_ROOT(env->sc_user_names)) != NULL) { 304 RB_REMOVE(user_name_tree, env->sc_user_names, 305 ue); 306 free(ue); 307 } 308 free(env->sc_user_names); 309 free(env->sc_user_lines); 310 311 env->sc_user_names = env->sc_user_names_t; 312 env->sc_user_lines = NULL; 313 env->sc_user_names_t = NULL; 314 315 while ((ge = RB_ROOT(env->sc_group_names)) != NULL) { 316 RB_REMOVE(group_name_tree, 317 env->sc_group_names, ge); 318 free(ge); 319 } 320 free(env->sc_group_names); 321 free(env->sc_group_lines); 322 323 env->sc_group_names = env->sc_group_names_t; 324 env->sc_group_lines = NULL; 325 env->sc_group_names_t = NULL; 326 327 328 flatten_entries(env); 329 330 /* 331 * trees are flat now. build up uid, gid and netid trees. 332 */ 333 334 make_uids: 335 RB_INIT(&env->sc_user_uids); 336 RB_INIT(&env->sc_group_gids); 337 RB_FOREACH(ue, user_name_tree, env->sc_user_names) 338 RB_INSERT(user_uid_tree, 339 &env->sc_user_uids, ue); 340 RB_FOREACH(ge, group_name_tree, env->sc_group_names) 341 RB_INSERT(group_gid_tree, 342 &env->sc_group_gids, ge); 343 344 } 345 346 void 347 main_dispatch_client(int fd, short event, void *p) 348 { 349 int n; 350 int shut = 0; 351 struct env *env = p; 352 struct imsgev *iev = env->sc_iev; 353 struct imsgbuf *ibuf = &iev->ibuf; 354 struct idm_req ir; 355 struct imsg imsg; 356 357 switch (event) { 358 case EV_READ: 359 if ((n = imsg_read(ibuf)) == -1) 360 fatal("imsg_read error"); 361 if (n == 0) 362 shut = 1; 363 break; 364 case EV_WRITE: 365 if (msgbuf_write(&ibuf->w) == -1) 366 fatal("msgbuf_write"); 367 imsg_event_add(iev); 368 return; 369 default: 370 fatalx("unknown event"); 371 } 372 373 for (;;) { 374 if ((n = imsg_get(ibuf, &imsg)) == -1) 375 fatal("main_dispatch_client: imsg_get error"); 376 if (n == 0) 377 break; 378 379 switch (imsg.hdr.type) { 380 case IMSG_START_UPDATE: 381 main_start_update(env); 382 break; 383 case IMSG_PW_ENTRY: { 384 struct userent *ue; 385 size_t len; 386 387 if (env->update_trashed) 388 break; 389 390 (void)memcpy(&ir, imsg.data, sizeof(ir)); 391 if ((ue = calloc(1, sizeof(*ue))) == NULL || 392 (ue->ue_line = strdup(ir.ir_line)) == NULL) { 393 /* 394 * should cancel tree update instead. 395 */ 396 fatal("out of memory"); 397 } 398 ue->ue_uid = ir.ir_key.ik_uid; 399 len = strlen(ue->ue_line) + 1; 400 ue->ue_line[strcspn(ue->ue_line, ":")] = '\0'; 401 if (RB_INSERT(user_name_tree, env->sc_user_names_t, 402 ue) != NULL) { /* dup */ 403 free(ue->ue_line); 404 free(ue); 405 } else 406 env->sc_user_line_len += len; 407 break; 408 } 409 case IMSG_GRP_ENTRY: { 410 struct groupent *ge; 411 size_t len; 412 413 if (env->update_trashed) 414 break; 415 416 (void)memcpy(&ir, imsg.data, sizeof(ir)); 417 if ((ge = calloc(1, sizeof(*ge))) == NULL || 418 (ge->ge_line = strdup(ir.ir_line)) == NULL) { 419 /* 420 * should cancel tree update instead. 421 */ 422 fatal("out of memory"); 423 } 424 ge->ge_gid = ir.ir_key.ik_gid; 425 len = strlen(ge->ge_line) + 1; 426 ge->ge_line[strcspn(ge->ge_line, ":")] = '\0'; 427 if (RB_INSERT(group_name_tree, env->sc_group_names_t, 428 ge) != NULL) { /* dup */ 429 free(ge->ge_line); 430 free(ge); 431 } else 432 env->sc_group_line_len += len; 433 break; 434 } 435 case IMSG_TRASH_UPDATE: 436 main_trash_update(env); 437 break; 438 case IMSG_END_UPDATE: { 439 main_end_update(env); 440 break; 441 } 442 default: 443 log_debug("main_dispatch_client: unexpected imsg %d", 444 imsg.hdr.type); 445 break; 446 } 447 imsg_free(&imsg); 448 } 449 if (!shut) 450 imsg_event_add(iev); 451 else { 452 log_debug("king bula sez: ran into dead pipe"); 453 event_del(&iev->ev); 454 event_loopexit(NULL); 455 } 456 } 457 458 void 459 main_configure_client(struct env *env) 460 { 461 struct idm *idm; 462 struct imsgev *iev = env->sc_iev; 463 464 imsg_compose_event(iev, IMSG_CONF_START, 0, 0, -1, env, sizeof(*env)); 465 TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) { 466 imsg_compose_event(iev, IMSG_CONF_IDM, 0, 0, -1, 467 idm, sizeof(*idm)); 468 } 469 imsg_compose_event(iev, IMSG_CONF_END, 0, 0, -1, NULL, 0); 470 } 471 472 void 473 main_init_timer(int fd, short event, void *p) 474 { 475 struct env *env = p; 476 477 main_configure_client(env); 478 } 479 480 void 481 purge_config(struct env *env) 482 { 483 struct idm *idm; 484 485 while ((idm = TAILQ_FIRST(&env->sc_idms)) != NULL) { 486 TAILQ_REMOVE(&env->sc_idms, idm, idm_entry); 487 free(idm); 488 } 489 } 490 491 int 492 main(int argc, char *argv[]) 493 { 494 int c; 495 int debug; 496 struct passwd *pw; 497 struct env env; 498 struct event ev_sigint; 499 struct event ev_sigterm; 500 struct event ev_sigchld; 501 struct event ev_sighup; 502 struct event ev_timer; 503 struct timeval tv; 504 505 debug = 0; 506 ypldap_process = PROC_MAIN; 507 508 log_init(1); 509 510 while ((c = getopt(argc, argv, "dD:nf:v")) != -1) { 511 switch (c) { 512 case 'd': 513 debug = 2; 514 break; 515 case 'D': 516 if (cmdline_symset(optarg) < 0) 517 log_warnx("could not parse macro definition %s", 518 optarg); 519 break; 520 case 'n': 521 debug = 2; 522 opts |= YPLDAP_OPT_NOACTION; 523 break; 524 case 'f': 525 conffile = optarg; 526 break; 527 case 'v': 528 opts |= YPLDAP_OPT_VERBOSE; 529 break; 530 default: 531 usage(); 532 } 533 } 534 535 argc -= optind; 536 argv += optind; 537 538 if (argc) 539 usage(); 540 541 RB_INIT(&env.sc_user_uids); 542 RB_INIT(&env.sc_group_gids); 543 544 if (parse_config(&env, conffile, opts)) 545 exit(1); 546 if (opts & YPLDAP_OPT_NOACTION) { 547 fprintf(stderr, "configuration OK\n"); 548 exit(0); 549 } 550 551 if (geteuid()) 552 errx(1, "need root privileges"); 553 554 log_init(debug); 555 556 if (!debug) { 557 if (daemon(1, 0) == -1) 558 err(1, "failed to daemonize"); 559 } 560 561 log_info("startup%s", (debug > 1)?" [debug mode]":""); 562 563 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, 564 pipe_main2client) == -1) 565 fatal("socketpair"); 566 567 set_nonblock(pipe_main2client[0]); 568 set_nonblock(pipe_main2client[1]); 569 570 client_pid = ldapclient(pipe_main2client); 571 572 setproctitle("parent"); 573 event_init(); 574 575 signal_set(&ev_sigint, SIGINT, main_sig_handler, &env); 576 signal_set(&ev_sigterm, SIGTERM, main_sig_handler, &env); 577 signal_set(&ev_sighup, SIGHUP, main_sig_handler, &env); 578 signal_set(&ev_sigchld, SIGCHLD, main_sig_handler, &env); 579 signal_add(&ev_sigint, NULL); 580 signal_add(&ev_sigterm, NULL); 581 signal_add(&ev_sighup, NULL); 582 signal_add(&ev_sigchld, NULL); 583 584 close(pipe_main2client[1]); 585 if ((env.sc_iev = calloc(1, sizeof(*env.sc_iev))) == NULL) 586 fatal(NULL); 587 imsg_init(&env.sc_iev->ibuf, pipe_main2client[0]); 588 env.sc_iev->handler = main_dispatch_client; 589 590 env.sc_iev->events = EV_READ; 591 env.sc_iev->data = &env; 592 event_set(&env.sc_iev->ev, env.sc_iev->ibuf.fd, env.sc_iev->events, 593 env.sc_iev->handler, &env); 594 event_add(&env.sc_iev->ev, NULL); 595 596 yp_init(&env); 597 598 if ((pw = getpwnam(YPLDAP_USER)) == NULL) 599 fatal("getpwnam"); 600 601 #ifndef DEBUG 602 if (setgroups(1, &pw->pw_gid) || 603 setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) || 604 setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) 605 fatal("cannot drop privileges"); 606 #else 607 #warning disabling privilege revocation in debug mode 608 #endif 609 610 bzero(&tv, sizeof(tv)); 611 evtimer_set(&ev_timer, main_init_timer, &env); 612 evtimer_add(&ev_timer, &tv); 613 614 yp_enable_events(); 615 event_dispatch(); 616 main_shutdown(); 617 618 return (0); 619 } 620 621 void 622 imsg_event_add(struct imsgev *iev) 623 { 624 if (iev->handler == NULL) { 625 imsg_flush(&iev->ibuf); 626 return; 627 } 628 629 iev->events = EV_READ; 630 if (iev->ibuf.w.queued) 631 iev->events |= EV_WRITE; 632 633 event_del(&iev->ev); 634 event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data); 635 event_add(&iev->ev, NULL); 636 } 637 638 int 639 imsg_compose_event(struct imsgev *iev, u_int16_t type, u_int32_t peerid, 640 pid_t pid, int fd, void *data, u_int16_t datalen) 641 { 642 int ret; 643 644 if ((ret = imsg_compose(&iev->ibuf, type, peerid, 645 pid, fd, data, datalen)) != -1) 646 imsg_event_add(iev); 647 return (ret); 648 } 649 650 void 651 set_nonblock(int fd) 652 { 653 int flags; 654 655 if ((flags = fcntl(fd, F_GETFL, 0)) == -1) 656 fatal("fcntl F_GETFL"); 657 658 flags |= O_NONBLOCK; 659 660 if ((flags = fcntl(fd, F_SETFL, flags)) == -1) 661 fatal("fcntl F_SETFL"); 662 } 663