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