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