1 /* $OpenBSD: ypldap.c,v 1.19 2016/04/28 22:28:36 schwarze 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/queue.h> 21 #include <sys/socket.h> 22 #include <sys/signal.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 <errno.h> 31 #include <event.h> 32 #include <unistd.h> 33 #include <pwd.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <limits.h> 38 39 #include "ypldap.h" 40 41 __dead void usage(void); 42 int check_child(pid_t, const char *); 43 void main_sig_handler(int, short, void *); 44 void main_shutdown(void); 45 void main_dispatch_client(int, short, void *); 46 void main_configure_client(struct env *); 47 void main_init_timer(int, short, void *); 48 void main_start_update(struct env *); 49 void main_trash_update(struct env *); 50 void main_end_update(struct env *); 51 int main_create_user_groups(struct env *); 52 void purge_config(struct env *); 53 void reconfigure(struct env *); 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: unknown user %s in group %s\n", 245 ukey.ue_line, ge->ge_line); 246 if (bp != NULL) 247 *(bp-1) = ','; 248 continue; 249 } 250 if (bp != NULL) 251 *(bp-1) = ','; 252 253 /* Make sure the new group doesn't equal to the main gid */ 254 if (ge->ge_gid == ue->ue_gid) 255 continue; 256 257 len = strlen(ue->ue_netid_line); 258 p = ue->ue_netid_line + len; 259 260 if ((snprintf(p, LINE_WIDTH-len-1, ",%d", 261 ge->ge_gid)) >= (int)(LINE_WIDTH-len)) { 262 return (-1); 263 } 264 } 265 } 266 267 return (0); 268 } 269 270 void 271 main_end_update(struct env *env) 272 { 273 struct userent *ue; 274 struct groupent *ge; 275 276 if (env->update_trashed) 277 return; 278 279 log_debug("updates are over, cleaning up trees now"); 280 281 if (main_create_user_groups(env) == -1) { 282 main_trash_update(env); 283 return; 284 } 285 286 if (env->sc_user_names == NULL) { 287 env->sc_user_names = env->sc_user_names_t; 288 env->sc_user_lines = NULL; 289 env->sc_user_names_t = NULL; 290 291 env->sc_group_names = env->sc_group_names_t; 292 env->sc_group_lines = NULL; 293 env->sc_group_names_t = NULL; 294 295 flatten_entries(env); 296 goto make_uids; 297 } 298 299 /* 300 * clean previous tree. 301 */ 302 while ((ue = RB_ROOT(env->sc_user_names)) != NULL) { 303 RB_REMOVE(user_name_tree, env->sc_user_names, 304 ue); 305 free(ue->ue_netid_line); 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 events, 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 if ((events & (EV_READ | EV_WRITE)) == 0) 358 fatalx("unknown event"); 359 360 if (events & EV_READ) { 361 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN) 362 fatal("imsg_read error"); 363 if (n == 0) 364 shut = 1; 365 } 366 if (events & EV_WRITE) { 367 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN) 368 fatal("msgbuf_write"); 369 if (n == 0) 370 shut = 1; 371 goto done; 372 } 373 374 for (;;) { 375 if ((n = imsg_get(ibuf, &imsg)) == -1) 376 fatal("main_dispatch_client: imsg_get error"); 377 if (n == 0) 378 break; 379 380 switch (imsg.hdr.type) { 381 case IMSG_START_UPDATE: 382 main_start_update(env); 383 break; 384 case IMSG_PW_ENTRY: { 385 struct userent *ue; 386 size_t len; 387 388 if (env->update_trashed) 389 break; 390 391 (void)memcpy(&ir, imsg.data, sizeof(ir)); 392 if ((ue = calloc(1, sizeof(*ue))) == NULL || 393 (ue->ue_line = strdup(ir.ir_line)) == NULL) { 394 /* 395 * should cancel tree update instead. 396 */ 397 fatal("out of memory"); 398 } 399 ue->ue_uid = ir.ir_key.ik_uid; 400 len = strlen(ue->ue_line) + 1; 401 ue->ue_line[strcspn(ue->ue_line, ":")] = '\0'; 402 if (RB_INSERT(user_name_tree, env->sc_user_names_t, 403 ue) != NULL) { /* dup */ 404 free(ue->ue_line); 405 free(ue); 406 } else 407 env->sc_user_line_len += len; 408 break; 409 } 410 case IMSG_GRP_ENTRY: { 411 struct groupent *ge; 412 size_t len; 413 414 if (env->update_trashed) 415 break; 416 417 (void)memcpy(&ir, imsg.data, sizeof(ir)); 418 if ((ge = calloc(1, sizeof(*ge))) == NULL || 419 (ge->ge_line = strdup(ir.ir_line)) == NULL) { 420 /* 421 * should cancel tree update instead. 422 */ 423 fatal("out of memory"); 424 } 425 ge->ge_gid = ir.ir_key.ik_gid; 426 len = strlen(ge->ge_line) + 1; 427 ge->ge_line[strcspn(ge->ge_line, ":")] = '\0'; 428 if (RB_INSERT(group_name_tree, env->sc_group_names_t, 429 ge) != NULL) { /* dup */ 430 free(ge->ge_line); 431 free(ge); 432 } else 433 env->sc_group_line_len += len; 434 break; 435 } 436 case IMSG_TRASH_UPDATE: 437 main_trash_update(env); 438 break; 439 case IMSG_END_UPDATE: { 440 main_end_update(env); 441 break; 442 } 443 default: 444 log_debug("main_dispatch_client: unexpected imsg %d", 445 imsg.hdr.type); 446 break; 447 } 448 imsg_free(&imsg); 449 } 450 451 done: 452 if (!shut) 453 imsg_event_add(iev); 454 else { 455 log_debug("king bula sez: ran into dead pipe"); 456 event_del(&iev->ev); 457 event_loopexit(NULL); 458 } 459 } 460 461 void 462 main_configure_client(struct env *env) 463 { 464 struct idm *idm; 465 struct imsgev *iev = env->sc_iev; 466 467 imsg_compose_event(iev, IMSG_CONF_START, 0, 0, -1, env, sizeof(*env)); 468 TAILQ_FOREACH(idm, &env->sc_idms, idm_entry) { 469 imsg_compose_event(iev, IMSG_CONF_IDM, 0, 0, -1, 470 idm, sizeof(*idm)); 471 } 472 imsg_compose_event(iev, IMSG_CONF_END, 0, 0, -1, NULL, 0); 473 } 474 475 void 476 main_init_timer(int fd, short event, void *p) 477 { 478 struct env *env = p; 479 480 main_configure_client(env); 481 } 482 483 void 484 purge_config(struct env *env) 485 { 486 struct idm *idm; 487 488 while ((idm = TAILQ_FIRST(&env->sc_idms)) != NULL) { 489 TAILQ_REMOVE(&env->sc_idms, idm, idm_entry); 490 free(idm); 491 } 492 } 493 494 int 495 main(int argc, char *argv[]) 496 { 497 int c; 498 int debug; 499 struct passwd *pw; 500 struct env env; 501 struct event ev_sigint; 502 struct event ev_sigterm; 503 struct event ev_sigchld; 504 struct event ev_sighup; 505 struct event ev_timer; 506 struct timeval tv; 507 508 debug = 0; 509 ypldap_process = PROC_MAIN; 510 511 log_init(1); 512 513 while ((c = getopt(argc, argv, "dD:nf:v")) != -1) { 514 switch (c) { 515 case 'd': 516 debug = 2; 517 break; 518 case 'D': 519 if (cmdline_symset(optarg) < 0) 520 log_warnx("could not parse macro definition %s", 521 optarg); 522 break; 523 case 'n': 524 debug = 2; 525 opts |= YPLDAP_OPT_NOACTION; 526 break; 527 case 'f': 528 conffile = optarg; 529 break; 530 case 'v': 531 opts |= YPLDAP_OPT_VERBOSE; 532 break; 533 default: 534 usage(); 535 } 536 } 537 538 argc -= optind; 539 argv += optind; 540 541 if (argc) 542 usage(); 543 544 RB_INIT(&env.sc_user_uids); 545 RB_INIT(&env.sc_group_gids); 546 547 if (parse_config(&env, conffile, opts)) 548 exit(1); 549 if (opts & YPLDAP_OPT_NOACTION) { 550 fprintf(stderr, "configuration OK\n"); 551 exit(0); 552 } 553 554 if (geteuid()) 555 errx(1, "need root privileges"); 556 557 log_init(debug); 558 559 if (!debug) { 560 if (daemon(1, 0) == -1) 561 err(1, "failed to daemonize"); 562 } 563 564 log_info("startup%s", (debug > 1)?" [debug mode]":""); 565 566 if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, PF_UNSPEC, 567 pipe_main2client) == -1) 568 fatal("socketpair"); 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 if (pledge("stdio inet", NULL) == -1) 611 fatal("pledge"); 612 613 bzero(&tv, sizeof(tv)); 614 evtimer_set(&ev_timer, main_init_timer, &env); 615 evtimer_add(&ev_timer, &tv); 616 617 yp_enable_events(); 618 event_dispatch(); 619 main_shutdown(); 620 621 return (0); 622 } 623 624 void 625 imsg_event_add(struct imsgev *iev) 626 { 627 if (iev->handler == NULL) { 628 imsg_flush(&iev->ibuf); 629 return; 630 } 631 632 iev->events = EV_READ; 633 if (iev->ibuf.w.queued) 634 iev->events |= EV_WRITE; 635 636 event_del(&iev->ev); 637 event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data); 638 event_add(&iev->ev, NULL); 639 } 640 641 int 642 imsg_compose_event(struct imsgev *iev, u_int16_t type, u_int32_t peerid, 643 pid_t pid, int fd, void *data, u_int16_t datalen) 644 { 645 int ret; 646 647 if ((ret = imsg_compose(&iev->ibuf, type, peerid, 648 pid, fd, data, datalen)) != -1) 649 imsg_event_add(iev); 650 return (ret); 651 } 652