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 <inttypes.h>
  35 #include <termios.h>
  36 #include <stdbool.h>
  37 #include <unistd.h>
  38 #include <grp.h>
  39 #include <libutil.h>
  40
  41 #include "pw.h"
  42 #include "bitmap.h"
  43
  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);
  48 static gid_t    gr_gidpolicy(struct userconf * cnf, long id);
  49
  50 static void
  51 set_passwd(struct group *grp, bool update)
  52 {
  53         int              b;
  54         int              istty;
  55         struct termios   t, n;
  56         char            *p, line[256];
  57
  58         if (conf.fd == '-') {
  59                 grp->gr_passwd = "*";   /* No access */
  60                 return;
  61         }
  62
  63         if ((istty = isatty(conf.fd))) {
  64                 n = t;
  65                 /* Disable echo */
  66                 n.c_lflag &= ~(ECHO);
  67                 tcsetattr(conf.fd, TCSANOW, &n);
  68                 printf("%sassword for group %s:", update ? "New p" : "P",
  69                     grp->gr_name);
  70                 fflush(stdout);
  71         }
  72         b = read(conf.fd, line, sizeof(line) - 1);
  73         if (istty) {    /* Restore state */
  74                 tcsetattr(conf.fd, TCSANOW, &t);
  75                 fputc('\n', stdout);
  76                 fflush(stdout);
  77         }
  78         if (b < 0)
  79                 err(EX_OSERR, "-h file descriptor");
  80         line[b] = '\0';
  81         if ((p = strpbrk(line, " \t\r\n")) != NULL)
  82                 *p = '\0';
  83         if (!*line)
  84                 errx(EX_DATAERR, "empty password read on file descriptor %d",
  85                     conf.fd);
  86         if (conf.precrypted) {
  87                 if (strchr(line, ':') != 0)
  88                         errx(EX_DATAERR, "wrong encrypted passwrd");
  89                 grp->gr_passwd = line;
  90         } else
  91                 grp->gr_passwd = pw_pwcrypt(line);
  92 }
  93
  94 int
  95 pw_groupnext(struct userconf *cnf, bool quiet)
  96 {
  97         gid_t next = gr_gidpolicy(cnf, -1);
  98
  99         if (quiet)
 100                 return (next);
 101         printf("%ju\n", (uintmax_t)next);
 102
 103         return (EXIT_SUCCESS);
 104 }
 105
 106 static int
 107 pw_groupshow(const char *name, long id, struct group *fakegroup)
 108 {
 109         struct group *grp = NULL;
 110
 111         if (id < 0 && name == NULL && !conf.all)
 112                 errx(EX_DATAERR, "groupname or id or '-a' required");
 113
 114         if (conf.all) {
 115                 SETGRENT();
 116                 while ((grp = GETGRENT()) != NULL)
 117                         print_group(grp);
 118                 ENDGRENT();
 119
 120                 return (EXIT_SUCCESS);
 121         }
 122
 123         grp = (name != NULL) ? GETGRNAM(name) : GETGRGID(id);
 124         if (grp == NULL) {
 125                 if (conf.force) {
 126                         grp = fakegroup;
 127                 } else {
 128                         if (name == NULL)
 129                                 errx(EX_DATAERR, "unknown gid `%ld'", id);
 130                         errx(EX_DATAERR, "unknown group `%s'", name);
 131                 }
 132         }
 133
 134         return (print_group(grp));
 135 }
 136
 137 static int
 138 pw_groupdel(const char *name, long id)
 139 {
 140         struct group *grp = NULL;
 141         int rc;
 142
 143         grp = (name != NULL) ? GETGRNAM(name) : GETGRGID(id);
 144         if (grp == NULL) {
 145                 if (name == NULL)
 146                         errx(EX_DATAERR, "unknown gid `%ld'", id);
 147                 errx(EX_DATAERR, "unknown group `%s'", name);
 148         }
 149
 150         rc = delgrent(grp);
 151         if (rc == -1)
 152                 err(EX_IOERR, "group '%s' not available (NIS?)", name);
 153         else if (rc != 0)
 154                 err(EX_IOERR, "group update");
 155         pw_log(conf.userconf, M_DELETE, W_GROUP, "%s(%ld) removed", name, id);
 156
 157         return (EXIT_SUCCESS);
 158 }
 159
 160 int
 161 pw_group(int mode, char *name, long id, struct cargs * args)
 162 {
 163         int             rc;
 164         struct carg    *arg;
 165         struct group   *grp = NULL;
 166         struct userconf *cnf = conf.userconf;
 167
 168         static struct group fakegroup =
 169         {
 170                 "nogroup",
 171                 "*",
 172                 -1,
 173                 NULL
 174         };
 175
 176         if (mode == M_NEXT)
 177                 return (pw_groupnext(cnf, conf.quiet));
 178
 179         if (mode == M_PRINT)
 180                 return (pw_groupshow(name, id, &fakegroup));
 181
 182         if (mode == M_DELETE)
 183                 return (pw_groupdel(name, id));
 184
 185         if (mode == M_LOCK || mode == M_UNLOCK)
 186                 errx(EX_USAGE, "'lock' command is not available for groups");
 187
 188         if (id < 0 && name == NULL)
 189                 errx(EX_DATAERR, "group name or id required");
 190
 191         grp = (name != NULL) ? GETGRNAM(name) : GETGRGID(id);
 192
 193         if (mode == M_UPDATE) {
 194                 if (name == NULL && grp == NULL)        /* Try harder */
 195                         grp = GETGRGID(id);
 196
 197                 if (grp == NULL) {
 198                         if (name == NULL)
 199                                 errx(EX_DATAERR, "unknown group `%s'", name);
 200                         else
 201                                 errx(EX_DATAERR, "unknown group `%ld'", id);
 202                 }
 203                 if (name == NULL)       /* Needed later */
 204                         name = grp->gr_name;
 205
 206                 if (id > 0)
 207                         grp->gr_gid = (gid_t) id;
 208
 209                 if (conf.newname != NULL)
 210                         grp->gr_name = pw_checkname(conf.newname, 0);
 211         } else {
 212                 if (name == NULL)       /* Required */
 213                         errx(EX_DATAERR, "group name required");
 214                 else if (grp != NULL)   /* Exists */
 215                         errx(EX_DATAERR, "group name `%s' already exists", name);
 216
 217                 grp = &fakegroup;
 218                 grp->gr_name = pw_checkname(name, 0);
 219                 grp->gr_passwd = "*";
 220                 grp->gr_gid = gr_gidpolicy(cnf, id);
 221                 grp->gr_mem = NULL;
 222         }
 223
 224         /*
 225          * This allows us to set a group password Group passwords is an
 226          * antique idea, rarely used and insecure (no secure database) Should
 227          * be discouraged, but it is apparently still supported by some
 228          * software.
 229          */
 230
 231         if (conf.which == W_GROUP && conf.fd != -1)
 232                 set_passwd(grp, mode == M_UPDATE);
 233
 234         if (((arg = getarg(args, 'M')) != NULL ||
 235             (arg = getarg(args, 'd')) != NULL ||
 236             (arg = getarg(args, 'm')) != NULL) && arg->val) {
 237                 char   *p;
 238                 struct passwd   *pwd;
 239
 240                 /* Make sure this is not stay NULL with -M "" */
 241                 if (arg->ch == 'd')
 242                         delete_members(grp, arg->val);
 243                 else if (arg->ch == 'M')
 244                         grp->gr_mem = NULL;
 245
 246                 for (p = strtok(arg->val, ", \t"); arg->ch != 'd' &&  p != NULL;
 247                     p = strtok(NULL, ", \t")) {
 248                         int     j;
 249
 250                         /*
 251                          * Check for duplicates
 252                          */
 253                         pwd = lookup_pwent(p);
 254                         for (j = 0; grp->gr_mem != NULL && grp->gr_mem[j] != NULL; j++) {
 255                                 if (strcmp(grp->gr_mem[j], pwd->pw_name) == 0)
 256                                         break;
 257                         }
 258                         if (grp->gr_mem != NULL && grp->gr_mem[j] != NULL)
 259                                 continue;
 260                         grp = gr_add(grp, pwd->pw_name);
 261                 }
 262         }
 263
 264         if (conf.dryrun)
 265                 return print_group(grp);
 266
 267         if (mode == M_ADD && (rc = addgrent(grp)) != 0) {
 268                 if (rc == -1)
 269                         errx(EX_IOERR, "group '%s' already exists",
 270                             grp->gr_name);
 271                 else
 272                         err(EX_IOERR, "group update");
 273         } else if (mode == M_UPDATE && (rc = chggrent(name, grp)) != 0) {
 274                 if (rc == -1)
 275                         errx(EX_IOERR, "group '%s' not available (NIS?)",
 276                             grp->gr_name);
 277                 else
 278                         err(EX_IOERR, "group update");
 279         }
 280
 281         if (conf.newname != NULL)
 282                 name = conf.newname;
 283         /* grp may have been invalidated */
 284         if ((grp = GETGRNAM(name)) == NULL)
 285                 errx(EX_SOFTWARE, "group disappeared during update");
 286
 287         pw_log(cnf, mode, W_GROUP, "%s(%ju)", grp->gr_name, (uintmax_t)grp->gr_gid);
 288
 289         return EXIT_SUCCESS;
 290 }
 291
 292
 293 /*
 294  * Lookup a passwd entry using a name or UID.
 295  */
 296 static struct passwd *
 297 lookup_pwent(const char *user)
 298 {
 299         struct passwd *pwd;
 300
 301         if ((pwd = GETPWNAM(user)) == NULL &&
 302             (!isdigit((unsigned char)*user) ||
 303             (pwd = getpwuid((uid_t) atoi(user))) == NULL))
 304                 errx(EX_NOUSER, "user `%s' does not exist", user);
 305
 306         return (pwd);
 307 }
 308
 309
 310 /*
 311  * Delete requested members from a group.
 312  */
 313 static void
 314 delete_members(struct group *grp, char *list)
 315 {
 316         char *p;
 317         int k;
 318
 319         if (grp->gr_mem == NULL)
 320                 return;
 321
 322         for (p = strtok(list, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
 323                 for (k = 0; grp->gr_mem[k] != NULL; k++) {
 324                         if (strcmp(grp->gr_mem[k], p) == 0)
 325                                 break;
 326                 }
 327                 if (grp->gr_mem[k] == NULL) /* No match */
 328                         continue;
 329
 330                 for (; grp->gr_mem[k] != NULL; k++)
 331                         grp->gr_mem[k] = grp->gr_mem[k+1];
 332         }
 333 }
 334
 335
 336 static          gid_t
 337 gr_gidpolicy(struct userconf * cnf, long id)
 338 {
 339         struct group   *grp;
 340         gid_t           gid = (gid_t) - 1;
 341
 342         /*
 343          * Check the given gid, if any
 344          */
 345         if (id > 0) {
 346                 gid = (gid_t) id;
 347
 348                 if ((grp = GETGRGID(gid)) != NULL && conf.checkduplicate)
 349                         errx(EX_DATAERR, "gid `%ju' has already been allocated", (uintmax_t)grp->gr_gid);
 350         } else {
 351                 struct bitmap   bm;
 352
 353                 /*
 354                  * We need to allocate the next available gid under one of
 355                  * two policies a) Grab the first unused gid b) Grab the
 356                  * highest possible unused gid
 357                  */
 358                 if (cnf->min_gid >= cnf->max_gid) {     /* Sanity claus^H^H^H^Hheck */
 359                         cnf->min_gid = 1000;
 360                         cnf->max_gid = 32000;
 361                 }
 362                 bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
 363
 364                 /*
 365                  * Now, let's fill the bitmap from the password file
 366                  */
 367                 SETGRENT();
 368                 while ((grp = GETGRENT()) != NULL)
 369                         if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid &&
 370                             (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid)
 371                                 bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
 372                 ENDGRENT();
 373
 374                 /*
 375                  * Then apply the policy, with fallback to reuse if necessary
 376                  */
 377                 if (cnf->reuse_gids)
 378                         gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 379                 else {
 380                         gid = (gid_t) (bm_lastset(&bm) + 1);
 381                         if (!bm_isset(&bm, gid))
 382                                 gid += cnf->min_gid;
 383                         else
 384                                 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 385                 }
 386
 387                 /*
 388                  * Another sanity check
 389                  */
 390                 if (gid < cnf->min_gid || gid > cnf->max_gid)
 391                         errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
 392                 bm_dealloc(&bm);
 393         }
 394         return gid;
 395 }
 396
 397
 398 static int
 399 print_group(struct group * grp)
 400 {
 401         if (!conf.pretty) {
 402                 char           *buf = NULL;
 403
 404                 buf = gr_make(grp);
 405                 printf("%s\n", buf);
 406                 free(buf);
 407         } else {
 408                 int             i;
 409
 410                 printf("Group Name: %-15s   #%lu\n"
 411                        "   Members: ",
 412                        grp->gr_name, (long) grp->gr_gid);
 413                 if (grp->gr_mem != NULL) {
 414                         for (i = 0; grp->gr_mem[i]; i++)
 415                                 printf("%s%s", i ? "," : "", grp->gr_mem[i]);
 416                 }
 417                 fputs("\n\n", stdout);
 418         }
 419         return EXIT_SUCCESS;
 420 }