1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (C) 1996 5 * David L. Nugent. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <ctype.h> 30 #include <err.h> 31 #include <grp.h> 32 #include <libutil.h> 33 #include <paths.h> 34 #include <string.h> 35 #include <sysexits.h> 36 #include <termios.h> 37 #include <unistd.h> 38 39 #include "pw.h" 40 #include "bitmap.h" 41 42 static struct passwd *lookup_pwent(const char *user); 43 static void delete_members(struct group *grp, char *list); 44 static int print_group(struct group * grp, bool pretty); 45 static gid_t gr_gidpolicy(struct userconf * cnf, intmax_t id); 46 47 static void 48 grp_set_passwd(struct group *grp, bool update, int fd, bool precrypted) 49 { 50 int b; 51 int istty; 52 struct termios t, n; 53 static char line[256]; 54 char *p; 55 56 if (fd == -1) 57 return; 58 59 if (fd == '-') { 60 grp->gr_passwd = "*"; /* No access */ 61 return; 62 } 63 64 if ((istty = isatty(fd))) { 65 if (tcgetattr(fd, &t) == -1) 66 istty = 0; 67 else { 68 n = t; 69 /* Disable echo */ 70 n.c_lflag &= ~(ECHO); 71 tcsetattr(fd, TCSANOW, &n); 72 printf("%sassword for group %s:", 73 update ? "New p" : "P", 74 grp->gr_name); 75 fflush(stdout); 76 } 77 } 78 b = read(fd, line, sizeof(line) - 1); 79 if (istty) { /* Restore state */ 80 tcsetattr(fd, TCSANOW, &t); 81 fputc('\n', stdout); 82 fflush(stdout); 83 } 84 if (b < 0) 85 err(EX_OSERR, "-h file descriptor"); 86 line[b] = '\0'; 87 if ((p = strpbrk(line, " \t\r\n")) != NULL) 88 *p = '\0'; 89 if (!*line) 90 errx(EX_DATAERR, "empty password read on file descriptor %d", 91 conf.fd); 92 if (precrypted) { 93 if (strchr(line, ':') != 0) 94 errx(EX_DATAERR, "wrong encrypted passwrd"); 95 grp->gr_passwd = line; 96 } else 97 grp->gr_passwd = pw_pwcrypt(line); 98 } 99 100 int 101 pw_groupnext(struct userconf *cnf, bool quiet) 102 { 103 gid_t next = gr_gidpolicy(cnf, -1); 104 105 if (quiet) 106 return (next); 107 printf("%ju\n", (uintmax_t)next); 108 109 return (EXIT_SUCCESS); 110 } 111 112 static struct group * 113 getgroup(char *name, intmax_t id, bool fatal) 114 { 115 struct group *grp; 116 117 if (id < 0 && name == NULL) 118 errx(EX_DATAERR, "groupname or id required"); 119 grp = (name != NULL) ? GETGRNAM(name) : GETGRGID(id); 120 if (grp == NULL) { 121 if (!fatal) 122 return (NULL); 123 if (name == NULL) 124 errx(EX_DATAERR, "unknown gid `%ju'", id); 125 errx(EX_DATAERR, "unknown group `%s'", name); 126 } 127 return (grp); 128 } 129 130 /* 131 * Lookup a passwd entry using a name or UID. 132 */ 133 static struct passwd * 134 lookup_pwent(const char *user) 135 { 136 struct passwd *pwd; 137 138 if ((pwd = GETPWNAM(user)) == NULL && 139 (!isdigit((unsigned char)*user) || 140 (pwd = getpwuid((uid_t) atoi(user))) == NULL)) 141 errx(EX_NOUSER, "user `%s' does not exist", user); 142 143 return (pwd); 144 } 145 146 147 /* 148 * Delete requested members from a group. 149 */ 150 static void 151 delete_members(struct group *grp, char *list) 152 { 153 char *p; 154 int k; 155 156 if (grp->gr_mem == NULL) 157 return; 158 159 for (p = strtok(list, ", \t"); p != NULL; p = strtok(NULL, ", \t")) { 160 for (k = 0; grp->gr_mem[k] != NULL; k++) { 161 if (strcmp(grp->gr_mem[k], p) == 0) 162 break; 163 } 164 if (grp->gr_mem[k] == NULL) /* No match */ 165 continue; 166 167 for (; grp->gr_mem[k] != NULL; k++) 168 grp->gr_mem[k] = grp->gr_mem[k+1]; 169 } 170 } 171 172 static gid_t 173 gr_gidpolicy(struct userconf * cnf, intmax_t id) 174 { 175 struct group *grp; 176 struct bitmap bm; 177 gid_t gid = (gid_t) - 1; 178 179 /* 180 * Check the given gid, if any 181 */ 182 if (id > 0) { 183 gid = (gid_t) id; 184 185 if ((grp = GETGRGID(gid)) != NULL && conf.checkduplicate) 186 errx(EX_DATAERR, "gid `%ju' has already been allocated", 187 (uintmax_t)grp->gr_gid); 188 return (gid); 189 } 190 191 /* 192 * We need to allocate the next available gid under one of 193 * two policies a) Grab the first unused gid b) Grab the 194 * highest possible unused gid 195 */ 196 if (cnf->min_gid >= cnf->max_gid) { /* Sanity claus^H^H^H^Hheck */ 197 cnf->min_gid = 1000; 198 cnf->max_gid = 32000; 199 } 200 bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1); 201 202 /* 203 * Now, let's fill the bitmap from the password file 204 */ 205 SETGRENT(); 206 while ((grp = GETGRENT()) != NULL) 207 if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid && 208 (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid) 209 bm_setbit(&bm, grp->gr_gid - cnf->min_gid); 210 ENDGRENT(); 211 212 /* 213 * Then apply the policy, with fallback to reuse if necessary 214 */ 215 if (cnf->reuse_gids) 216 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid); 217 else { 218 gid = (gid_t) (bm_lastset(&bm) + 1); 219 if (!bm_isset(&bm, gid)) 220 gid += cnf->min_gid; 221 else 222 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid); 223 } 224 225 /* 226 * Another sanity check 227 */ 228 if (gid < cnf->min_gid || gid > cnf->max_gid) 229 errx(EX_SOFTWARE, "unable to allocate a new gid - range fully " 230 "used"); 231 bm_dealloc(&bm); 232 return (gid); 233 } 234 235 static int 236 print_group(struct group * grp, bool pretty) 237 { 238 char *buf = NULL; 239 int i; 240 241 if (pretty) { 242 printf("Group Name: %-15s #%lu\n" 243 " Members: ", 244 grp->gr_name, (long) grp->gr_gid); 245 if (grp->gr_mem != NULL) { 246 for (i = 0; grp->gr_mem[i]; i++) 247 printf("%s%s", i ? "," : "", grp->gr_mem[i]); 248 } 249 fputs("\n\n", stdout); 250 return (EXIT_SUCCESS); 251 } 252 253 buf = gr_make(grp); 254 printf("%s\n", buf); 255 free(buf); 256 return (EXIT_SUCCESS); 257 } 258 259 int 260 pw_group_next(int argc, char **argv, char *arg1 __unused) 261 { 262 struct userconf *cnf; 263 const char *cfg = NULL; 264 int ch; 265 bool quiet = false; 266 267 while ((ch = getopt(argc, argv, "C:q")) != -1) { 268 switch (ch) { 269 case 'C': 270 cfg = optarg; 271 break; 272 case 'q': 273 quiet = true; 274 break; 275 default: 276 exit(EX_USAGE); 277 } 278 } 279 280 if (quiet) 281 freopen(_PATH_DEVNULL, "w", stderr); 282 cnf = get_userconfig(cfg); 283 return (pw_groupnext(cnf, quiet)); 284 } 285 286 int 287 pw_group_show(int argc, char **argv, char *arg1) 288 { 289 struct group *grp = NULL; 290 char *name = NULL; 291 intmax_t id = -1; 292 int ch; 293 bool all, force, quiet, pretty; 294 295 all = force = quiet = pretty = false; 296 297 struct group fakegroup = { 298 "nogroup", 299 "*", 300 -1, 301 NULL 302 }; 303 304 if (arg1 != NULL) { 305 if (arg1[strspn(arg1, "0123456789")] == '\0') 306 id = pw_checkid(arg1, GID_MAX); 307 else 308 name = arg1; 309 } 310 311 while ((ch = getopt(argc, argv, "C:qn:g:FPa")) != -1) { 312 switch (ch) { 313 case 'C': 314 /* ignore compatibility */ 315 break; 316 case 'q': 317 quiet = true; 318 break; 319 case 'n': 320 name = optarg; 321 break; 322 case 'g': 323 id = pw_checkid(optarg, GID_MAX); 324 break; 325 case 'F': 326 force = true; 327 break; 328 case 'P': 329 pretty = true; 330 break; 331 case 'a': 332 all = true; 333 break; 334 default: 335 exit(EX_USAGE); 336 } 337 } 338 339 if (quiet) 340 freopen(_PATH_DEVNULL, "w", stderr); 341 342 if (all) { 343 SETGRENT(); 344 while ((grp = GETGRENT()) != NULL) 345 print_group(grp, pretty); 346 ENDGRENT(); 347 return (EXIT_SUCCESS); 348 } 349 350 grp = getgroup(name, id, !force); 351 if (grp == NULL) 352 grp = &fakegroup; 353 354 return (print_group(grp, pretty)); 355 } 356 357 int 358 pw_group_del(int argc, char **argv, char *arg1) 359 { 360 struct userconf *cnf = NULL; 361 struct group *grp = NULL; 362 char *name; 363 const char *cfg = NULL; 364 intmax_t id = -1; 365 int ch, rc; 366 bool quiet = false; 367 bool nis = false; 368 369 if (arg1 != NULL) { 370 if (arg1[strspn(arg1, "0123456789")] == '\0') 371 id = pw_checkid(arg1, GID_MAX); 372 else 373 name = arg1; 374 } 375 376 while ((ch = getopt(argc, argv, "C:qn:g:Y")) != -1) { 377 switch (ch) { 378 case 'C': 379 cfg = optarg; 380 break; 381 case 'q': 382 quiet = true; 383 break; 384 case 'n': 385 name = optarg; 386 break; 387 case 'g': 388 id = pw_checkid(optarg, GID_MAX); 389 break; 390 case 'Y': 391 nis = true; 392 break; 393 default: 394 exit(EX_USAGE); 395 } 396 } 397 398 if (quiet) 399 freopen(_PATH_DEVNULL, "w", stderr); 400 grp = getgroup(name, id, true); 401 cnf = get_userconfig(cfg); 402 rc = delgrent(grp); 403 if (rc == -1) 404 err(EX_IOERR, "group '%s' not available (NIS?)", name); 405 else if (rc != 0) 406 err(EX_IOERR, "group update"); 407 pw_log(cnf, M_DELETE, W_GROUP, "%s(%ju) removed", name, 408 (uintmax_t)id); 409 410 if (nis && nis_update() == 0) 411 pw_log(cnf, M_DELETE, W_GROUP, "NIS maps updated"); 412 413 return (EXIT_SUCCESS); 414 } 415 416 bool 417 grp_has_member(struct group *grp, const char *name) 418 { 419 int j; 420 421 for (j = 0; grp->gr_mem != NULL && grp->gr_mem[j] != NULL; j++) 422 if (strcmp(grp->gr_mem[j], name) == 0) 423 return (true); 424 return (false); 425 } 426 427 static void 428 grp_add_members(struct group **grp, char *members) 429 { 430 struct passwd *pwd; 431 char *p; 432 char tok[] = ", \t"; 433 434 if (members == NULL) 435 return; 436 for (p = strtok(members, tok); p != NULL; p = strtok(NULL, tok)) { 437 pwd = lookup_pwent(p); 438 if (grp_has_member(*grp, pwd->pw_name)) 439 continue; 440 *grp = gr_add(*grp, pwd->pw_name); 441 } 442 } 443 444 int 445 groupadd(struct userconf *cnf, char *name, gid_t id, char *members, int fd, 446 bool dryrun, bool pretty, bool precrypted) 447 { 448 struct group *grp; 449 int rc; 450 451 struct group fakegroup = { 452 "nogroup", 453 "*", 454 -1, 455 NULL 456 }; 457 458 grp = &fakegroup; 459 grp->gr_name = pw_checkname(name, 0); 460 grp->gr_passwd = "*"; 461 grp->gr_gid = gr_gidpolicy(cnf, id); 462 grp->gr_mem = NULL; 463 464 /* 465 * This allows us to set a group password Group passwords is an 466 * antique idea, rarely used and insecure (no secure database) Should 467 * be discouraged, but it is apparently still supported by some 468 * software. 469 */ 470 grp_set_passwd(grp, false, fd, precrypted); 471 grp_add_members(&grp, members); 472 if (dryrun) 473 return (print_group(grp, pretty)); 474 475 if ((rc = addgrent(grp)) != 0) { 476 if (rc == -1) 477 errx(EX_IOERR, "group '%s' already exists", 478 grp->gr_name); 479 else 480 err(EX_IOERR, "group update"); 481 } 482 483 pw_log(cnf, M_ADD, W_GROUP, "%s(%ju)", grp->gr_name, 484 (uintmax_t)grp->gr_gid); 485 486 return (EXIT_SUCCESS); 487 } 488 489 int 490 pw_group_add(int argc, char **argv, char *arg1) 491 { 492 struct userconf *cnf = NULL; 493 char *name = NULL; 494 char *members = NULL; 495 const char *cfg = NULL; 496 intmax_t id = -1; 497 int ch, rc, fd = -1; 498 bool quiet, precrypted, dryrun, pretty, nis; 499 500 quiet = precrypted = dryrun = pretty = nis = false; 501 502 if (arg1 != NULL) { 503 if (arg1[strspn(arg1, "0123456789")] == '\0') 504 id = pw_checkid(arg1, GID_MAX); 505 else 506 name = arg1; 507 } 508 509 while ((ch = getopt(argc, argv, "C:qn:g:h:H:M:oNPY")) != -1) { 510 switch (ch) { 511 case 'C': 512 cfg = optarg; 513 break; 514 case 'q': 515 quiet = true; 516 break; 517 case 'n': 518 name = optarg; 519 break; 520 case 'g': 521 id = pw_checkid(optarg, GID_MAX); 522 break; 523 case 'H': 524 if (fd != -1) 525 errx(EX_USAGE, "'-h' and '-H' are mutually " 526 "exclusive options"); 527 fd = pw_checkfd(optarg); 528 precrypted = true; 529 if (fd == '-') 530 errx(EX_USAGE, "-H expects a file descriptor"); 531 break; 532 case 'h': 533 if (fd != -1) 534 errx(EX_USAGE, "'-h' and '-H' are mutually " 535 "exclusive options"); 536 fd = pw_checkfd(optarg); 537 break; 538 case 'M': 539 members = optarg; 540 break; 541 case 'o': 542 conf.checkduplicate = false; 543 break; 544 case 'N': 545 dryrun = true; 546 break; 547 case 'P': 548 pretty = true; 549 break; 550 case 'Y': 551 nis = true; 552 break; 553 default: 554 exit(EX_USAGE); 555 } 556 } 557 558 if (quiet) 559 freopen(_PATH_DEVNULL, "w", stderr); 560 if (name == NULL) 561 errx(EX_DATAERR, "group name required"); 562 if (GETGRNAM(name) != NULL) 563 errx(EX_DATAERR, "group name `%s' already exists", name); 564 cnf = get_userconfig(cfg); 565 rc = groupadd(cnf, name, gr_gidpolicy(cnf, id), members, fd, dryrun, 566 pretty, precrypted); 567 if (nis && rc == EXIT_SUCCESS && nis_update() == 0) 568 pw_log(cnf, M_ADD, W_GROUP, "NIS maps updated"); 569 570 return (rc); 571 } 572 573 int 574 pw_group_mod(int argc, char **argv, char *arg1) 575 { 576 struct userconf *cnf; 577 struct group *grp = NULL; 578 const char *cfg = NULL; 579 char *oldmembers = NULL; 580 char *members = NULL; 581 char *newmembers = NULL; 582 char *newname = NULL; 583 char *name = NULL; 584 intmax_t id = -1; 585 int ch, rc, fd = -1; 586 bool quiet, pretty, dryrun, nis, precrypted; 587 588 quiet = pretty = dryrun = nis = precrypted = false; 589 590 if (arg1 != NULL) { 591 if (arg1[strspn(arg1, "0123456789")] == '\0') 592 id = pw_checkid(arg1, GID_MAX); 593 else 594 name = arg1; 595 } 596 597 while ((ch = getopt(argc, argv, "C:qn:d:g:l:h:H:M:m:NPY")) != -1) { 598 switch (ch) { 599 case 'C': 600 cfg = optarg; 601 break; 602 case 'q': 603 quiet = true; 604 break; 605 case 'n': 606 name = optarg; 607 break; 608 case 'g': 609 id = pw_checkid(optarg, GID_MAX); 610 break; 611 case 'd': 612 oldmembers = optarg; 613 break; 614 case 'l': 615 newname = optarg; 616 break; 617 case 'H': 618 if (fd != -1) 619 errx(EX_USAGE, "'-h' and '-H' are mutually " 620 "exclusive options"); 621 fd = pw_checkfd(optarg); 622 precrypted = true; 623 if (fd == '-') 624 errx(EX_USAGE, "-H expects a file descriptor"); 625 break; 626 case 'h': 627 if (fd != -1) 628 errx(EX_USAGE, "'-h' and '-H' are mutually " 629 "exclusive options"); 630 fd = pw_checkfd(optarg); 631 break; 632 case 'M': 633 members = optarg; 634 break; 635 case 'm': 636 newmembers = optarg; 637 break; 638 case 'N': 639 dryrun = true; 640 break; 641 case 'P': 642 pretty = true; 643 break; 644 case 'Y': 645 nis = true; 646 break; 647 default: 648 exit(EX_USAGE); 649 } 650 } 651 if (quiet) 652 freopen(_PATH_DEVNULL, "w", stderr); 653 cnf = get_userconfig(cfg); 654 grp = getgroup(name, id, true); 655 if (name == NULL) 656 name = grp->gr_name; 657 if (id > 0) 658 grp->gr_gid = id; 659 660 if (newname != NULL) 661 grp->gr_name = pw_checkname(newname, 0); 662 663 grp_set_passwd(grp, true, fd, precrypted); 664 /* 665 * Keep the same logic as old code for now: 666 * if -M is passed, -d and -m are ignored 667 * then id -d, -m is ignored 668 * last is -m 669 */ 670 671 if (members) { 672 grp->gr_mem = NULL; 673 grp_add_members(&grp, members); 674 } else if (oldmembers) { 675 delete_members(grp, oldmembers); 676 } else if (newmembers) { 677 grp_add_members(&grp, newmembers); 678 } 679 680 if (dryrun) { 681 print_group(grp, pretty); 682 return (EXIT_SUCCESS); 683 } 684 685 if ((rc = chggrent(name, grp)) != 0) { 686 if (rc == -1) 687 errx(EX_IOERR, "group '%s' not available (NIS?)", 688 grp->gr_name); 689 else 690 err(EX_IOERR, "group update"); 691 } 692 693 if (newname) 694 name = newname; 695 696 /* grp may have been invalidated */ 697 if ((grp = GETGRNAM(name)) == NULL) 698 errx(EX_SOFTWARE, "group disappeared during update"); 699 700 pw_log(cnf, M_UPDATE, W_GROUP, "%s(%ju)", grp->gr_name, 701 (uintmax_t)grp->gr_gid); 702 703 if (nis && nis_update() == 0) 704 pw_log(cnf, M_UPDATE, W_GROUP, "NIS maps updated"); 705 706 return (EXIT_SUCCESS); 707 } 708