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
  38 #include "pw.h"
  39 #include "bitmap.h"
  40
  41
  42 static struct passwd *lookup_pwent(const char *user);
  43 static void     delete_members(char ***members, int *grmembers, int *i,
  44     struct carg *arg, struct group *grp);
  45 static int      print_group(struct group * grp, int pretty);
  46 static gid_t    gr_gidpolicy(struct userconf * cnf, struct cargs * args);
  47
  48 int
  49 pw_group(struct userconf * cnf, int mode, struct cargs * args)
  50 {
  51         int             rc;
  52         struct carg    *a_name = getarg(args, 'n');
  53         struct carg    *a_gid = getarg(args, 'g');
  54         struct carg    *arg;
  55         struct group   *grp = NULL;
  56         int             grmembers = 0;
  57         char           **members = NULL;
  58
  59         static struct group fakegroup =
  60         {
  61                 "nogroup",
  62                 "*",
  63                 -1,
  64                 NULL
  65         };
  66
  67         if (mode == M_LOCK || mode == M_UNLOCK)
  68                 errx(EX_USAGE, "'lock' command is not available for groups");
  69
  70         /*
  71          * With M_NEXT, we only need to return the
  72          * next gid to stdout
  73          */
  74         if (mode == M_NEXT) {
  75                 gid_t next = gr_gidpolicy(cnf, args);
  76                 if (getarg(args, 'q'))
  77                         return next;
  78                 printf("%ld\n", (long)next);
  79                 return EXIT_SUCCESS;
  80         }
  81
  82         if (mode == M_PRINT && getarg(args, 'a')) {
  83                 int             pretty = getarg(args, 'P') != NULL;
  84
  85                 SETGRENT();
  86                 while ((grp = GETGRENT()) != NULL)
  87                         print_group(grp, pretty);
  88                 ENDGRENT();
  89                 return EXIT_SUCCESS;
  90         }
  91         if (a_gid == NULL) {
  92                 if (a_name == NULL)
  93                         errx(EX_DATAERR, "group name or id required");
  94
  95                 if (mode != M_ADD && grp == NULL && isdigit((unsigned char)*a_name->val)) {
  96                         (a_gid = a_name)->ch = 'g';
  97                         a_name = NULL;
  98                 }
  99         }
 100         grp = (a_name != NULL) ? GETGRNAM(a_name->val) : GETGRGID((gid_t) atoi(a_gid->val));
 101
 102         if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
 103                 if (a_name == NULL && grp == NULL)      /* Try harder */
 104                         grp = GETGRGID(atoi(a_gid->val));
 105
 106                 if (grp == NULL) {
 107                         if (mode == M_PRINT && getarg(args, 'F')) {
 108                                 char    *fmems[1];
 109                                 fmems[0] = NULL;
 110                                 fakegroup.gr_name = a_name ? a_name->val : "nogroup";
 111                                 fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1;
 112                                 fakegroup.gr_mem = fmems;
 113                                 return print_group(&fakegroup, getarg(args, 'P') != NULL);
 114                         }
 115                         errx(EX_DATAERR, "unknown group `%s'", a_name ? a_name->val : a_gid->val);
 116                 }
 117                 if (a_name == NULL)     /* Needed later */
 118                         a_name = addarg(args, 'n', grp->gr_name);
 119
 120                 /*
 121                  * Handle deletions now
 122                  */
 123                 if (mode == M_DELETE) {
 124                         gid_t           gid = grp->gr_gid;
 125
 126                         rc = delgrent(grp);
 127                         if (rc == -1)
 128                                 err(EX_IOERR, "group '%s' not available (NIS?)", grp->gr_name);
 129                         else if (rc != 0) {
 130                                 warn("group update");
 131                                 return EX_IOERR;
 132                         }
 133                         pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid);
 134                         return EXIT_SUCCESS;
 135                 } else if (mode == M_PRINT)
 136                         return print_group(grp, getarg(args, 'P') != NULL);
 137
 138                 if (a_gid)
 139                         grp->gr_gid = (gid_t) atoi(a_gid->val);
 140
 141                 if ((arg = getarg(args, 'l')) != NULL)
 142                         grp->gr_name = pw_checkname((u_char *)arg->val, 0);
 143         } else {
 144                 if (a_name == NULL)     /* Required */
 145                         errx(EX_DATAERR, "group name required");
 146                 else if (grp != NULL)   /* Exists */
 147                         errx(EX_DATAERR, "group name `%s' already exists", a_name->val);
 148
 149                 extendarray(&members, &grmembers, 200);
 150                 members[0] = NULL;
 151                 grp = &fakegroup;
 152                 grp->gr_name = pw_checkname((u_char *)a_name->val, 0);
 153                 grp->gr_passwd = "*";
 154                 grp->gr_gid = gr_gidpolicy(cnf, args);
 155                 grp->gr_mem = members;
 156         }
 157
 158         /*
 159          * This allows us to set a group password Group passwords is an
 160          * antique idea, rarely used and insecure (no secure database) Should
 161          * be discouraged, but it is apparently still supported by some
 162          * software.
 163          */
 164
 165         if ((arg = getarg(args, 'h')) != NULL ||
 166             (arg = getarg(args, 'H')) != NULL) {
 167                 if (strcmp(arg->val, "-") == 0)
 168                         grp->gr_passwd = "*";   /* No access */
 169                 else {
 170                         int             fd = atoi(arg->val);
 171                         int             precrypt = (arg->ch == 'H');
 172                         int             b;
 173                         int             istty = isatty(fd);
 174                         struct termios  t;
 175                         char           *p, line[256];
 176
 177                         if (istty) {
 178                                 if (tcgetattr(fd, &t) == -1)
 179                                         istty = 0;
 180                                 else {
 181                                         struct termios  n = t;
 182
 183                                         /* Disable echo */
 184                                         n.c_lflag &= ~(ECHO);
 185                                         tcsetattr(fd, TCSANOW, &n);
 186                                         printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name);
 187                                         fflush(stdout);
 188                                 }
 189                         }
 190                         b = read(fd, line, sizeof(line) - 1);
 191                         if (istty) {    /* Restore state */
 192                                 tcsetattr(fd, TCSANOW, &t);
 193                                 fputc('\n', stdout);
 194                                 fflush(stdout);
 195                         }
 196                         if (b < 0) {
 197                                 warn("-h file descriptor");
 198                                 return EX_OSERR;
 199                         }
 200                         line[b] = '\0';
 201                         if ((p = strpbrk(line, " \t\r\n")) != NULL)
 202                                 *p = '\0';
 203                         if (!*line)
 204                                 errx(EX_DATAERR, "empty password read on file descriptor %d", fd);
 205                         if (precrypt) {
 206                                 if (strchr(line, ':') != NULL)
 207                                         return EX_DATAERR;
 208                                 grp->gr_passwd = line;
 209                         } else
 210                                 grp->gr_passwd = pw_pwcrypt(line);
 211                 }
 212         }
 213
 214         if (((arg = getarg(args, 'M')) != NULL ||
 215             (arg = getarg(args, 'd')) != NULL ||
 216             (arg = getarg(args, 'm')) != NULL) && arg->val) {
 217                 int     i = 0;
 218                 char   *p;
 219                 struct passwd   *pwd;
 220
 221                 /* Make sure this is not stay NULL with -M "" */
 222                 extendarray(&members, &grmembers, 200);
 223                 if (arg->ch == 'd')
 224                         delete_members(&members, &grmembers, &i, arg, grp);
 225                 else if (arg->ch == 'm') {
 226                         int     k = 0;
 227
 228                         while (grp->gr_mem[k] != NULL) {
 229                                 if (extendarray(&members, &grmembers, i + 2) != -1)
 230                                         members[i++] = grp->gr_mem[k];
 231                                 k++;
 232                         }
 233                 }
 234
 235                 if (arg->ch != 'd')
 236                         for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
 237                                 int     j;
 238
 239                                 /*
 240                                  * Check for duplicates
 241                                  */
 242                                 pwd = lookup_pwent(p);
 243                                 for (j = 0; j < i && strcmp(members[j], pwd->pw_name) != 0; j++)
 244                                         ;
 245                                 if (j == i && extendarray(&members, &grmembers, i + 2) != -1)
 246                                         members[i++] = newstr(pwd->pw_name);
 247                         }
 248                 while (i < grmembers)
 249                         members[i++] = NULL;
 250                 grp->gr_mem = members;
 251         }
 252
 253         if (getarg(args, 'N') != NULL)
 254                 return print_group(grp, getarg(args, 'P') != NULL);
 255
 256         if (mode == M_ADD && (rc = addgrent(grp)) != 0) {
 257                 if (rc == -1)
 258                         warnx("group '%s' already exists", grp->gr_name);
 259                 else
 260                         warn("group update");
 261                 return EX_IOERR;
 262         } else if (mode == M_UPDATE && (rc = chggrent(a_name->val, grp)) != 0) {
 263                 if (rc == -1)
 264                         warnx("group '%s' not available (NIS?)", grp->gr_name);
 265                 else
 266                         warn("group update");
 267                 return EX_IOERR;
 268         }
 269         /* grp may have been invalidated */
 270         if ((grp = GETGRNAM(a_name->val)) == NULL)
 271                 errx(EX_SOFTWARE, "group disappeared during update");
 272
 273         pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid);
 274
 275         if (members)
 276                 free(members);
 277
 278         return EXIT_SUCCESS;
 279 }
 280
 281
 282 /*
 283  * Lookup a passwd entry using a name or UID.
 284  */
 285 static struct passwd *
 286 lookup_pwent(const char *user)
 287 {
 288         struct passwd *pwd;
 289
 290         if ((pwd = GETPWNAM(user)) == NULL &&
 291             (!isdigit((unsigned char)*user) ||
 292             (pwd = getpwuid((uid_t) atoi(user))) == NULL))
 293                 errx(EX_NOUSER, "user `%s' does not exist", user);
 294
 295         return (pwd);
 296 }
 297
 298
 299 /*
 300  * Delete requested members from a group.
 301  */
 302 static void
 303 delete_members(char ***members, int *grmembers, int *i, struct carg *arg,
 304     struct group *grp)
 305 {
 306         bool matchFound;
 307         char *user;
 308         char *valueCopy;
 309         char *valuePtr;
 310         int k;
 311         struct passwd *pwd;
 312
 313         k = 0;
 314         while (grp->gr_mem[k] != NULL) {
 315                 matchFound = false;
 316                 if ((valueCopy = strdup(arg->val)) == NULL)
 317                         errx(EX_UNAVAILABLE, "out of memory");
 318                 valuePtr = valueCopy;
 319                 while ((user = strsep(&valuePtr, ", \t")) != NULL) {
 320                         pwd = lookup_pwent(user);
 321                         if (strcmp(grp->gr_mem[k], pwd->pw_name) == 0) {
 322                                 matchFound = true;
 323                                 break;
 324                         }
 325                 }
 326                 free(valueCopy);
 327
 328                 if (!matchFound &&
 329                     extendarray(members, grmembers, *i + 2) != -1)
 330                         (*members)[(*i)++] = grp->gr_mem[k];
 331
 332                 k++;
 333         }
 334
 335         return;
 336 }
 337
 338
 339 static          gid_t
 340 gr_gidpolicy(struct userconf * cnf, struct cargs * args)
 341 {
 342         struct group   *grp;
 343         gid_t           gid = (gid_t) - 1;
 344         struct carg    *a_gid = getarg(args, 'g');
 345
 346         /*
 347          * Check the given gid, if any
 348          */
 349         if (a_gid != NULL) {
 350                 gid = (gid_t) atol(a_gid->val);
 351
 352                 if ((grp = GETGRGID(gid)) != NULL && getarg(args, 'o') == NULL)
 353                         errx(EX_DATAERR, "gid `%ld' has already been allocated", (long) grp->gr_gid);
 354         } else {
 355                 struct bitmap   bm;
 356
 357                 /*
 358                  * We need to allocate the next available gid under one of
 359                  * two policies a) Grab the first unused gid b) Grab the
 360                  * highest possible unused gid
 361                  */
 362                 if (cnf->min_gid >= cnf->max_gid) {     /* Sanity claus^H^H^H^Hheck */
 363                         cnf->min_gid = 1000;
 364                         cnf->max_gid = 32000;
 365                 }
 366                 bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
 367
 368                 /*
 369                  * Now, let's fill the bitmap from the password file
 370                  */
 371                 SETGRENT();
 372                 while ((grp = GETGRENT()) != NULL)
 373                         if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid &&
 374                             (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid)
 375                                 bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
 376                 ENDGRENT();
 377
 378                 /*
 379                  * Then apply the policy, with fallback to reuse if necessary
 380                  */
 381                 if (cnf->reuse_gids)
 382                         gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 383                 else {
 384                         gid = (gid_t) (bm_lastset(&bm) + 1);
 385                         if (!bm_isset(&bm, gid))
 386                                 gid += cnf->min_gid;
 387                         else
 388                                 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 389                 }
 390
 391                 /*
 392                  * Another sanity check
 393                  */
 394                 if (gid < cnf->min_gid || gid > cnf->max_gid)
 395                         errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
 396                 bm_dealloc(&bm);
 397         }
 398         return gid;
 399 }
 400
 401
 402 static int
 403 print_group(struct group * grp, int pretty)
 404 {
 405         if (!pretty) {
 406                 int             buflen = 0;
 407                 char           *buf = NULL;
 408
 409                 fmtgrent(&buf, &buflen, grp);
 410                 fputs(buf, stdout);
 411                 free(buf);
 412         } else {
 413                 int             i;
 414
 415                 printf("Group Name: %-15s   #%lu\n"
 416                        "   Members: ",
 417                        grp->gr_name, (long) grp->gr_gid);
 418                 for (i = 0; grp->gr_mem[i]; i++)
 419                         printf("%s%s", i ? "," : "", grp->gr_mem[i]);
 420                 fputs("\n\n", stdout);
 421         }
 422         return EXIT_SUCCESS;
 423 }