pw/pw_group.c

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