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(char ***members, int *grmembers, int *i,
  46     struct carg *arg, struct group *grp);
  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_group(int mode, char *name, long id, struct cargs * args)
  96 {
  97         int             rc;
  98         struct carg    *arg;
  99         struct group   *grp = NULL;
 100         int             grmembers = 0;
 101         char           **members = NULL;
 102         struct userconf *cnf = conf.userconf;
 103
 104         static struct group fakegroup =
 105         {
 106                 "nogroup",
 107                 "*",
 108                 -1,
 109                 NULL
 110         };
 111
 112         if (mode == M_LOCK || mode == M_UNLOCK)
 113                 errx(EX_USAGE, "'lock' command is not available for groups");
 114
 115         /*
 116          * With M_NEXT, we only need to return the
 117          * next gid to stdout
 118          */
 119         if (mode == M_NEXT) {
 120                 gid_t next = gr_gidpolicy(cnf, id);
 121                 if (getarg(args, 'q'))
 122                         return next;
 123                 printf("%u\n", next);
 124                 return EXIT_SUCCESS;
 125         }
 126
 127         if (mode == M_PRINT && getarg(args, 'a')) {
 128                 SETGRENT();
 129                 while ((grp = GETGRENT()) != NULL)
 130                         print_group(grp);
 131                 ENDGRENT();
 132                 return EXIT_SUCCESS;
 133         }
 134         if (id < 0 && name == NULL)
 135                 errx(EX_DATAERR, "group name or id required");
 136
 137         grp = (name != NULL) ? GETGRNAM(name) : GETGRGID(id);
 138
 139         if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
 140                 if (name == NULL && grp == NULL)        /* Try harder */
 141                         grp = GETGRGID(id);
 142
 143                 if (grp == NULL) {
 144                         if (mode == M_PRINT && getarg(args, 'F')) {
 145                                 char    *fmems[1];
 146                                 fmems[0] = NULL;
 147                                 fakegroup.gr_name = name ? name : "nogroup";
 148                                 fakegroup.gr_gid = (gid_t) id;
 149                                 fakegroup.gr_mem = fmems;
 150                                 return print_group(&fakegroup);
 151                         }
 152                         if (name == NULL)
 153                                 errx(EX_DATAERR, "unknown group `%s'", name);
 154                         else
 155                                 errx(EX_DATAERR, "unknown group `%ld'", id);
 156                 }
 157                 if (name == NULL)       /* Needed later */
 158                         name = grp->gr_name;
 159
 160                 /*
 161                  * Handle deletions now
 162                  */
 163                 if (mode == M_DELETE) {
 164                         rc = delgrent(grp);
 165                         if (rc == -1)
 166                                 err(EX_IOERR, "group '%s' not available (NIS?)",
 167                                     name);
 168                         else if (rc != 0) {
 169                                 err(EX_IOERR, "group update");
 170                         }
 171                         pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", name, id);
 172                         return EXIT_SUCCESS;
 173                 } else if (mode == M_PRINT)
 174                         return print_group(grp);
 175
 176                 if (id > 0)
 177                         grp->gr_gid = (gid_t) id;
 178
 179                 if (conf.newname != NULL)
 180                         grp->gr_name = pw_checkname(conf.newname, 0);
 181         } else {
 182                 if (name == NULL)       /* Required */
 183                         errx(EX_DATAERR, "group name required");
 184                 else if (grp != NULL)   /* Exists */
 185                         errx(EX_DATAERR, "group name `%s' already exists", name);
 186
 187                 extendarray(&members, &grmembers, 200);
 188                 members[0] = NULL;
 189                 grp = &fakegroup;
 190                 grp->gr_name = pw_checkname(name, 0);
 191                 grp->gr_passwd = "*";
 192                 grp->gr_gid = gr_gidpolicy(cnf, id);
 193                 grp->gr_mem = members;
 194         }
 195
 196         /*
 197          * This allows us to set a group password Group passwords is an
 198          * antique idea, rarely used and insecure (no secure database) Should
 199          * be discouraged, but it is apparently still supported by some
 200          * software.
 201          */
 202
 203         if (conf.fd != -1)
 204                 set_passwd(grp, mode == M_UPDATE);
 205
 206         if (((arg = getarg(args, 'M')) != NULL ||
 207             (arg = getarg(args, 'd')) != NULL ||
 208             (arg = getarg(args, 'm')) != NULL) && arg->val) {
 209                 int     i = 0;
 210                 char   *p;
 211                 struct passwd   *pwd;
 212
 213                 /* Make sure this is not stay NULL with -M "" */
 214                 extendarray(&members, &grmembers, 200);
 215                 if (arg->ch == 'd')
 216                         delete_members(&members, &grmembers, &i, arg, grp);
 217                 else if (arg->ch == 'm') {
 218                         int     k = 0;
 219
 220                         if (grp->gr_mem != NULL) {
 221                                 while (grp->gr_mem[k] != NULL) {
 222                                         if (extendarray(&members, &grmembers, i + 2) != -1)
 223                                                 members[i++] = grp->gr_mem[k];
 224                                         k++;
 225                                 }
 226                         }
 227                 }
 228
 229                 if (arg->ch != 'd')
 230                         for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
 231                                 int     j;
 232
 233                                 /*
 234                                  * Check for duplicates
 235                                  */
 236                                 pwd = lookup_pwent(p);
 237                                 for (j = 0; j < i && strcmp(members[j], pwd->pw_name) != 0; j++)
 238                                         ;
 239                                 if (j == i && extendarray(&members, &grmembers, i + 2) != -1)
 240                                         members[i++] = newstr(pwd->pw_name);
 241                         }
 242                 while (i < grmembers)
 243                         members[i++] = NULL;
 244                 grp->gr_mem = members;
 245         }
 246
 247         if (conf.dryrun)
 248                 return print_group(grp);
 249
 250         if (mode == M_ADD && (rc = addgrent(grp)) != 0) {
 251                 if (rc == -1)
 252                         errx(EX_IOERR, "group '%s' already exists",
 253                             grp->gr_name);
 254                 else
 255                         err(EX_IOERR, "group update");
 256         } else if (mode == M_UPDATE && (rc = chggrent(name, grp)) != 0) {
 257                 if (rc == -1)
 258                         errx(EX_IOERR, "group '%s' not available (NIS?)",
 259                             grp->gr_name);
 260                 else
 261                         err(EX_IOERR, "group update");
 262         }
 263
 264         if (conf.newname != NULL)
 265                 name = conf.newname;
 266         /* grp may have been invalidated */
 267         if ((grp = GETGRNAM(name)) == NULL)
 268                 errx(EX_SOFTWARE, "group disappeared during update");
 269
 270         pw_log(cnf, mode, W_GROUP, "%s(%u)", grp->gr_name, grp->gr_gid);
 271
 272         free(members);
 273
 274         return EXIT_SUCCESS;
 275 }
 276
 277
 278 /*
 279  * Lookup a passwd entry using a name or UID.
 280  */
 281 static struct passwd *
 282 lookup_pwent(const char *user)
 283 {
 284         struct passwd *pwd;
 285
 286         if ((pwd = GETPWNAM(user)) == NULL &&
 287             (!isdigit((unsigned char)*user) ||
 288             (pwd = getpwuid((uid_t) atoi(user))) == NULL))
 289                 errx(EX_NOUSER, "user `%s' does not exist", user);
 290
 291         return (pwd);
 292 }
 293
 294
 295 /*
 296  * Delete requested members from a group.
 297  */
 298 static void
 299 delete_members(char ***members, int *grmembers, int *i, struct carg *arg,
 300     struct group *grp)
 301 {
 302         bool matchFound;
 303         char *user;
 304         char *valueCopy;
 305         char *valuePtr;
 306         int k;
 307         struct passwd *pwd;
 308
 309         if (grp->gr_mem == NULL)
 310                 return;
 311
 312         k = 0;
 313         while (grp->gr_mem[k] != NULL) {
 314                 matchFound = false;
 315                 if ((valueCopy = strdup(arg->val)) == NULL)
 316                         errx(EX_UNAVAILABLE, "out of memory");
 317                 valuePtr = valueCopy;
 318                 while ((user = strsep(&valuePtr, ", \t")) != NULL) {
 319                         pwd = lookup_pwent(user);
 320                         if (strcmp(grp->gr_mem[k], pwd->pw_name) == 0) {
 321                                 matchFound = true;
 322                                 break;
 323                         }
 324                 }
 325                 free(valueCopy);
 326
 327                 if (!matchFound &&
 328                     extendarray(members, grmembers, *i + 2) != -1)
 329                         (*members)[(*i)++] = grp->gr_mem[k];
 330
 331                 k++;
 332         }
 333
 334         return;
 335 }
 336
 337
 338 static          gid_t
 339 gr_gidpolicy(struct userconf * cnf, long id)
 340 {
 341         struct group   *grp;
 342         gid_t           gid = (gid_t) - 1;
 343
 344         /*
 345          * Check the given gid, if any
 346          */
 347         if (id > 0) {
 348                 gid = (gid_t) id;
 349
 350                 if ((grp = GETGRGID(gid)) != NULL && conf.checkduplicate)
 351                         errx(EX_DATAERR, "gid `%u' has already been allocated", grp->gr_gid);
 352         } else {
 353                 struct bitmap   bm;
 354
 355                 /*
 356                  * We need to allocate the next available gid under one of
 357                  * two policies a) Grab the first unused gid b) Grab the
 358                  * highest possible unused gid
 359                  */
 360                 if (cnf->min_gid >= cnf->max_gid) {     /* Sanity claus^H^H^H^Hheck */
 361                         cnf->min_gid = 1000;
 362                         cnf->max_gid = 32000;
 363                 }
 364                 bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
 365
 366                 /*
 367                  * Now, let's fill the bitmap from the password file
 368                  */
 369                 SETGRENT();
 370                 while ((grp = GETGRENT()) != NULL)
 371                         if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid &&
 372                             (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid)
 373                                 bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
 374                 ENDGRENT();
 375
 376                 /*
 377                  * Then apply the policy, with fallback to reuse if necessary
 378                  */
 379                 if (cnf->reuse_gids)
 380                         gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 381                 else {
 382                         gid = (gid_t) (bm_lastset(&bm) + 1);
 383                         if (!bm_isset(&bm, gid))
 384                                 gid += cnf->min_gid;
 385                         else
 386                                 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 387                 }
 388
 389                 /*
 390                  * Another sanity check
 391                  */
 392                 if (gid < cnf->min_gid || gid > cnf->max_gid)
 393                         errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
 394                 bm_dealloc(&bm);
 395         }
 396         return gid;
 397 }
 398
 399
 400 static int
 401 print_group(struct group * grp)
 402 {
 403         if (!conf.pretty) {
 404                 char           *buf = NULL;
 405
 406                 buf = gr_make(grp);
 407                 printf("%s\n", buf);
 408                 free(buf);
 409         } else {
 410                 int             i;
 411
 412                 printf("Group Name: %-15s   #%lu\n"
 413                        "   Members: ",
 414                        grp->gr_name, (long) grp->gr_gid);
 415                 if (grp->gr_mem != NULL) {
 416                         for (i = 0; grp->gr_mem[i]; i++)
 417                                 printf("%s%s", i ? "," : "", grp->gr_mem[i]);
 418                 }
 419                 fputs("\n\n", stdout);
 420         }
 421         return EXIT_SUCCESS;
 422 }