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