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",
 184                             (uintmax_t)grp->gr_gid);
 185                 return (gid);
 186         }
 187
 188         /*
 189          * We need to allocate the next available gid under one of
 190          * two policies a) Grab the first unused gid b) Grab the
 191          * highest possible unused gid
 192          */
 193         if (cnf->min_gid >= cnf->max_gid) {     /* Sanity claus^H^H^H^Hheck */
 194                 cnf->min_gid = 1000;
 195                 cnf->max_gid = 32000;
 196         }
 197         bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
 198
 199         /*
 200          * Now, let's fill the bitmap from the password file
 201          */
 202         SETGRENT();
 203         while ((grp = GETGRENT()) != NULL)
 204                 if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid &&
 205                     (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid)
 206                         bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
 207         ENDGRENT();
 208
 209         /*
 210          * Then apply the policy, with fallback to reuse if necessary
 211          */
 212         if (cnf->reuse_gids)
 213                 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 214         else {
 215                 gid = (gid_t) (bm_lastset(&bm) + 1);
 216                 if (!bm_isset(&bm, gid))
 217                         gid += cnf->min_gid;
 218                 else
 219                         gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 220         }
 221
 222         /*
 223          * Another sanity check
 224          */
 225         if (gid < cnf->min_gid || gid > cnf->max_gid)
 226                 errx(EX_SOFTWARE, "unable to allocate a new gid - range fully "
 227                     "used");
 228         bm_dealloc(&bm);
 229         return (gid);
 230 }
 231
 232 static int
 233 print_group(struct group * grp, bool pretty)
 234 {
 235         char *buf = NULL;
 236         int i;
 237
 238         if (pretty) {
 239                 printf("Group Name: %-15s   #%lu\n"
 240                        "   Members: ",
 241                        grp->gr_name, (long) grp->gr_gid);
 242                 if (grp->gr_mem != NULL) {
 243                         for (i = 0; grp->gr_mem[i]; i++)
 244                                 printf("%s%s", i ? "," : "", grp->gr_mem[i]);
 245                 }
 246                 fputs("\n\n", stdout);
 247                 return (EXIT_SUCCESS);
 248         }
 249
 250         buf = gr_make(grp);
 251         printf("%s\n", buf);
 252         free(buf);
 253         return (EXIT_SUCCESS);
 254 }
 255
 256 int
 257 pw_group_next(int argc, char **argv, char *arg1 __unused)
 258 {
 259         struct userconf *cnf;
 260         const char *cfg = NULL;
 261         int ch;
 262         bool quiet = false;
 263
 264         while ((ch = getopt(argc, argv, "C:q")) != -1) {
 265                 switch (ch) {
 266                 case 'C':
 267                         cfg = optarg;
 268                         break;
 269                 case 'q':
 270                         quiet = true;
 271                         break;
 272                 }
 273         }
 274
 275         if (quiet)
 276                 freopen(_PATH_DEVNULL, "w", stderr);
 277         cnf = get_userconfig(cfg);
 278         return (pw_groupnext(cnf, quiet));
 279 }
 280
 281 int
 282 pw_group_show(int argc, char **argv, char *arg1)
 283 {
 284         struct group *grp = NULL;
 285         char *name;
 286         intmax_t id = -1;
 287         int ch;
 288         bool all, force, quiet, pretty;
 289
 290         all = force = quiet = pretty = false;
 291
 292         struct group fakegroup = {
 293                 "nogroup",
 294                 "*",
 295                 -1,
 296                 NULL
 297         };
 298
 299         if (arg1 != NULL) {
 300                 if (arg1[strspn(arg1, "0123456789")] == '\0')
 301                         id = pw_checkid(arg1, GID_MAX);
 302                 else
 303                         name = arg1;
 304         }
 305
 306         while ((ch = getopt(argc, argv, "C:qn:g:FPa")) != -1) {
 307                 switch (ch) {
 308                 case 'C':
 309                         /* ignore compatibility */
 310                         break;
 311                 case 'q':
 312                         quiet = true;
 313                         break;
 314                 case 'n':
 315                         name = optarg;
 316                         break;
 317                 case 'g':
 318                         id = pw_checkid(optarg, GID_MAX);
 319                         break;
 320                 case 'F':
 321                         force = true;
 322                         break;
 323                 case 'P':
 324                         pretty = true;
 325                         break;
 326                 case 'a':
 327                         all = true;
 328                         break;
 329                 }
 330         }
 331
 332         if (quiet)
 333                 freopen(_PATH_DEVNULL, "w", stderr);
 334
 335         if (all) {
 336                 SETGRENT();
 337                 while ((grp = GETGRENT()) != NULL)
 338                         print_group(grp, pretty);
 339                 ENDGRENT();
 340                 return (EXIT_SUCCESS);
 341         }
 342
 343         grp = getgroup(name, id, !force);
 344         if (grp == NULL)
 345                 grp = &fakegroup;
 346
 347         return (print_group(grp, pretty));
 348 }
 349
 350 int
 351 pw_group_del(int argc, char **argv, char *arg1)
 352 {
 353         struct userconf *cnf = NULL;
 354         struct group *grp = NULL;
 355         char *name;
 356         const char *cfg = NULL;
 357         intmax_t id = -1;
 358         int ch, rc;
 359         bool quiet = false;
 360         bool nis = false;
 361
 362         if (arg1 != NULL) {
 363                 if (arg1[strspn(arg1, "0123456789")] == '\0')
 364                         id = pw_checkid(arg1, GID_MAX);
 365                 else
 366                         name = arg1;
 367         }
 368
 369         while ((ch = getopt(argc, argv, "C:qn:g:Y")) != -1) {
 370                 switch (ch) {
 371                 case 'C':
 372                         cfg = optarg;
 373                         break;
 374                 case 'q':
 375                         quiet = true;
 376                         break;
 377                 case 'n':
 378                         name = optarg;
 379                         break;
 380                 case 'g':
 381                         id = pw_checkid(optarg, GID_MAX);
 382                         break;
 383                 case 'Y':
 384                         nis = true;
 385                         break;
 386                 }
 387         }
 388
 389         if (quiet)
 390                 freopen(_PATH_DEVNULL, "w", stderr);
 391         grp = getgroup(name, id, true);
 392         cnf = get_userconfig(cfg);
 393         rc = delgrent(grp);
 394         if (rc == -1)
 395                 err(EX_IOERR, "group '%s' not available (NIS?)", name);
 396         else if (rc != 0)
 397                 err(EX_IOERR, "group update");
 398         pw_log(cnf, M_DELETE, W_GROUP, "%s(%ju) removed", name,
 399             (uintmax_t)id);
 400
 401         if (nis && nis_update() == 0)
 402                 pw_log(cnf, M_DELETE, W_GROUP, "NIS maps updated");
 403
 404         return (EXIT_SUCCESS);
 405 }
 406
 407 static bool
 408 grp_has_member(struct group *grp, const char *name)
 409 {
 410         int j;
 411
 412         for (j = 0; grp->gr_mem != NULL && grp->gr_mem[j] != NULL; j++)
 413                 if (strcmp(grp->gr_mem[j], name) == 0)
 414                         return (true);
 415         return (false);
 416 }
 417
 418 static void
 419 grp_add_members(struct group **grp, char *members)
 420 {
 421         struct passwd *pwd;
 422         char *p;
 423         char tok[] = ", \t";
 424
 425         if (members == NULL)
 426                 return;
 427         for (p = strtok(members, tok); p != NULL; p = strtok(NULL, tok)) {
 428                 pwd = lookup_pwent(p);
 429                 if (grp_has_member(*grp, pwd->pw_name))
 430                         continue;
 431                 *grp = gr_add(*grp, pwd->pw_name);
 432         }
 433 }
 434
 435 int
 436 groupadd(struct userconf *cnf, char *name, gid_t id, char *members, int fd,
 437     bool dryrun, bool pretty, bool precrypted)
 438 {
 439         struct group *grp;
 440         int rc;
 441
 442         struct group fakegroup = {
 443                 "nogroup",
 444                 "*",
 445                 -1,
 446                 NULL
 447         };
 448
 449         grp = &fakegroup;
 450         grp->gr_name = pw_checkname(name, 0);
 451         grp->gr_passwd = "*";
 452         grp->gr_gid = gr_gidpolicy(cnf, id);
 453         grp->gr_mem = NULL;
 454
 455         /*
 456          * This allows us to set a group password Group passwords is an
 457          * antique idea, rarely used and insecure (no secure database) Should
 458          * be discouraged, but it is apparently still supported by some
 459          * software.
 460          */
 461         grp_set_passwd(grp, false, fd, precrypted);
 462         grp_add_members(&grp, members);
 463         if (dryrun)
 464                 return (print_group(grp, pretty));
 465
 466         if ((rc = addgrent(grp)) != 0) {
 467                 if (rc == -1)
 468                         errx(EX_IOERR, "group '%s' already exists",
 469                             grp->gr_name);
 470                 else
 471                         err(EX_IOERR, "group update");
 472         }
 473
 474         pw_log(cnf, M_ADD, W_GROUP, "%s(%ju)", grp->gr_name,
 475             (uintmax_t)grp->gr_gid);
 476
 477         return (EXIT_SUCCESS);
 478 }
 479
 480 int
 481 pw_group_add(int argc, char **argv, char *arg1)
 482 {
 483         struct userconf *cnf = NULL;
 484         char *name = NULL;
 485         char *members = NULL;
 486         const char *cfg = NULL;
 487         intmax_t id = -1;
 488         int ch, rc, fd = -1;
 489         bool quiet, precrypted, dryrun, pretty, nis;
 490
 491         quiet = precrypted = dryrun = pretty = nis = false;
 492
 493         if (arg1 != NULL) {
 494                 if (arg1[strspn(arg1, "0123456789")] == '\0')
 495                         id = pw_checkid(arg1, GID_MAX);
 496                 else
 497                         name = arg1;
 498         }
 499
 500         while ((ch = getopt(argc, argv, "C:qn:g:h:H:M:oNPY")) != -1) {
 501                 switch (ch) {
 502                 case 'C':
 503                         cfg = optarg;
 504                         break;
 505                 case 'q':
 506                         quiet = true;
 507                         break;
 508                 case 'n':
 509                         name = optarg;
 510                         break;
 511                 case 'g':
 512                         id = pw_checkid(optarg, GID_MAX);
 513                         break;
 514                 case 'H':
 515                         if (fd != -1)
 516                                 errx(EX_USAGE, "'-h' and '-H' are mutually "
 517                                     "exclusive options");
 518                         fd = pw_checkfd(optarg);
 519                         precrypted = true;
 520                         if (fd == '-')
 521                                 errx(EX_USAGE, "-H expects a file descriptor");
 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                         break;
 529                 case 'M':
 530                         members = optarg;
 531                         break;
 532                 case 'o':
 533                         conf.checkduplicate = false;
 534                         break;
 535                 case 'N':
 536                         dryrun = true;
 537                         break;
 538                 case 'P':
 539                         pretty = true;
 540                         break;
 541                 case 'Y':
 542                         nis = true;
 543                         break;
 544                 }
 545         }
 546
 547         if (quiet)
 548                 freopen(_PATH_DEVNULL, "w", stderr);
 549         if (name == NULL)
 550                 errx(EX_DATAERR, "group name required");
 551         if (GETGRNAM(name) != NULL)
 552                 errx(EX_DATAERR, "group name `%s' already exists", name);
 553         cnf = get_userconfig(cfg);
 554         rc = groupadd(cnf, name, gr_gidpolicy(cnf, id), members, fd, dryrun,
 555             pretty, precrypted);
 556         if (nis && rc == EXIT_SUCCESS && nis_update() == 0)
 557                 pw_log(cnf, M_ADD, W_GROUP, "NIS maps updated");
 558
 559         return (rc);
 560 }
 561
 562 int
 563 pw_group_mod(int argc, char **argv, char *arg1)
 564 {
 565         struct userconf *cnf;
 566         struct group *grp = NULL;
 567         const char *cfg = NULL;
 568         char *oldmembers = NULL;
 569         char *members = NULL;
 570         char *newmembers = NULL;
 571         char *newname = NULL;
 572         char *name = NULL;
 573         intmax_t id = -1;
 574         int ch, rc, fd = -1;
 575         bool quiet, pretty, dryrun, nis, precrypted;
 576
 577         quiet = pretty = dryrun = nis = precrypted = false;
 578
 579         if (arg1 != NULL) {
 580                 if (arg1[strspn(arg1, "0123456789")] == '\0')
 581                         id = pw_checkid(arg1, GID_MAX);
 582                 else
 583                         name = arg1;
 584         }
 585
 586         while ((ch = getopt(argc, argv, "C:qn:d:g:l:h:H:M:m:NPY")) != -1) {
 587                 switch (ch) {
 588                 case 'C':
 589                         cfg = optarg;
 590                         break;
 591                 case 'q':
 592                         quiet = true;
 593                         break;
 594                 case 'n':
 595                         name = optarg;
 596                         break;
 597                 case 'g':
 598                         id = pw_checkid(optarg, GID_MAX);
 599                         break;
 600                 case 'd':
 601                         oldmembers = optarg;
 602                         break;
 603                 case 'l':
 604                         newname = optarg;
 605                         break;
 606                 case 'H':
 607                         if (fd != -1)
 608                                 errx(EX_USAGE, "'-h' and '-H' are mutually "
 609                                     "exclusive options");
 610                         fd = pw_checkfd(optarg);
 611                         precrypted = true;
 612                         if (fd == '-')
 613                                 errx(EX_USAGE, "-H expects a file descriptor");
 614                         break;
 615                 case 'h':
 616                         if (fd != -1)
 617                                 errx(EX_USAGE, "'-h' and '-H' are mutually "
 618                                     "exclusive options");
 619                         fd = pw_checkfd(optarg);
 620                         break;
 621                 case 'M':
 622                         members = optarg;
 623                         break;
 624                 case 'm':
 625                         newmembers = optarg;
 626                         break;
 627                 case 'N':
 628                         dryrun = true;
 629                         break;
 630                 case 'P':
 631                         pretty = true;
 632                         break;
 633                 case 'Y':
 634                         nis = true;
 635                         break;
 636                 }
 637         }
 638         if (quiet)
 639                 freopen(_PATH_DEVNULL, "w", stderr);
 640         cnf = get_userconfig(cfg);
 641         grp = getgroup(name, id, true);
 642         if (name == NULL)
 643                 name = grp->gr_name;
 644         if (id > 0)
 645                 grp->gr_gid = id;
 646
 647         if (newname != NULL)
 648                 grp->gr_name = pw_checkname(newname, 0);
 649
 650         grp_set_passwd(grp, true, fd, precrypted);
 651         /*
 652          * Keep the same logic as old code for now:
 653          * if -M is passed, -d and -m are ignored
 654          * then id -d, -m is ignored
 655          * last is -m
 656          */
 657
 658         if (members) {
 659                 grp->gr_mem = NULL;
 660                 grp_add_members(&grp, members);
 661         } else if (oldmembers) {
 662                 delete_members(grp, oldmembers);
 663         } else if (newmembers) {
 664                 grp_add_members(&grp, newmembers);
 665         }
 666
 667         if (dryrun) {
 668                 print_group(grp, pretty);
 669                 return (EXIT_SUCCESS);
 670         }
 671
 672         if ((rc = chggrent(name, grp)) != 0) {
 673                 if (rc == -1)
 674                         errx(EX_IOERR, "group '%s' not available (NIS?)",
 675                             grp->gr_name);
 676                 else
 677                         err(EX_IOERR, "group update");
 678         }
 679
 680         if (newname)
 681                 name = newname;
 682
 683         /* grp may have been invalidated */
 684         if ((grp = GETGRNAM(name)) == NULL)
 685                 errx(EX_SOFTWARE, "group disappeared during update");
 686
 687         pw_log(cnf, M_UPDATE, W_GROUP, "%s(%ju)", grp->gr_name,
 688             (uintmax_t)grp->gr_gid);
 689
 690         if (nis && nis_update() == 0)
 691                 pw_log(cnf, M_UPDATE, W_GROUP, "NIS maps updated");
 692
 693         return (EXIT_SUCCESS);
 694 }