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 <unistd.h>
  36
  37 #include "pw.h"
  38 #include "bitmap.h"
  39
  40
  41 static int      print_group(struct group * grp, int pretty);
  42 static gid_t    gr_gidpolicy(struct userconf * cnf, struct cargs * args);
  43
  44 int
  45 pw_group(struct userconf * cnf, int mode, struct cargs * args)
  46 {
  47         int             rc;
  48         struct carg    *a_name = getarg(args, 'n');
  49         struct carg    *a_gid = getarg(args, 'g');
  50         struct carg    *arg;
  51         struct group   *grp = NULL;
  52         int             grmembers = 0;
  53         char           **members = NULL;
  54
  55         static struct group fakegroup =
  56         {
  57                 "nogroup",
  58                 "*",
  59                 -1,
  60                 NULL
  61         };
  62
  63         if (mode == M_LOCK || mode == M_UNLOCK)
  64                 errx(EX_USAGE, "'lock' command is not available for groups");
  65
  66         /*
  67          * With M_NEXT, we only need to return the
  68          * next gid to stdout
  69          */
  70         if (mode == M_NEXT) {
  71                 gid_t next = gr_gidpolicy(cnf, args);
  72                 if (getarg(args, 'q'))
  73                         return next;
  74                 printf("%ld\n", (long)next);
  75                 return EXIT_SUCCESS;
  76         }
  77
  78         if (mode == M_PRINT && getarg(args, 'a')) {
  79                 int             pretty = getarg(args, 'P') != NULL;
  80
  81                 SETGRENT();
  82                 while ((grp = GETGRENT()) != NULL)
  83                         print_group(grp, pretty);
  84                 ENDGRENT();
  85                 return EXIT_SUCCESS;
  86         }
  87         if (a_gid == NULL) {
  88                 if (a_name == NULL)
  89                         errx(EX_DATAERR, "group name or id required");
  90
  91                 if (mode != M_ADD && grp == NULL && isdigit((unsigned char)*a_name->val)) {
  92                         (a_gid = a_name)->ch = 'g';
  93                         a_name = NULL;
  94                 }
  95         }
  96         grp = (a_name != NULL) ? GETGRNAM(a_name->val) : GETGRGID((gid_t) atoi(a_gid->val));
  97
  98         if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
  99                 if (a_name == NULL && grp == NULL)      /* Try harder */
 100                         grp = GETGRGID(atoi(a_gid->val));
 101
 102                 if (grp == NULL) {
 103                         if (mode == M_PRINT && getarg(args, 'F')) {
 104                                 char    *fmems[1];
 105                                 fmems[0] = NULL;
 106                                 fakegroup.gr_name = a_name ? a_name->val : "nogroup";
 107                                 fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1;
 108                                 fakegroup.gr_mem = fmems;
 109                                 return print_group(&fakegroup, getarg(args, 'P') != NULL);
 110                         }
 111                         errx(EX_DATAERR, "unknown group `%s'", a_name ? a_name->val : a_gid->val);
 112                 }
 113                 if (a_name == NULL)     /* Needed later */
 114                         a_name = addarg(args, 'n', grp->gr_name);
 115
 116                 /*
 117                  * Handle deletions now
 118                  */
 119                 if (mode == M_DELETE) {
 120                         gid_t           gid = grp->gr_gid;
 121
 122                         rc = delgrent(grp);
 123                         if (rc == -1)
 124                                 err(EX_IOERR, "group '%s' not available (NIS?)", grp->gr_name);
 125                         else if (rc != 0) {
 126                                 warn("group update");
 127                                 return EX_IOERR;
 128                         }
 129                         pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid);
 130                         return EXIT_SUCCESS;
 131                 } else if (mode == M_PRINT)
 132                         return print_group(grp, getarg(args, 'P') != NULL);
 133
 134                 if (a_gid)
 135                         grp->gr_gid = (gid_t) atoi(a_gid->val);
 136
 137                 if ((arg = getarg(args, 'l')) != NULL)
 138                         grp->gr_name = pw_checkname((u_char *)arg->val, 0);
 139         } else {
 140                 if (a_name == NULL)     /* Required */
 141                         errx(EX_DATAERR, "group name required");
 142                 else if (grp != NULL)   /* Exists */
 143                         errx(EX_DATAERR, "group name `%s' already exists", a_name->val);
 144
 145                 extendarray(&members, &grmembers, 200);
 146                 members[0] = NULL;
 147                 grp = &fakegroup;
 148                 grp->gr_name = pw_checkname((u_char *)a_name->val, 0);
 149                 grp->gr_passwd = "*";
 150                 grp->gr_gid = gr_gidpolicy(cnf, args);
 151                 grp->gr_mem = members;
 152         }
 153
 154         /*
 155          * This allows us to set a group password Group passwords is an
 156          * antique idea, rarely used and insecure (no secure database) Should
 157          * be discouraged, but it is apparently still supported by some
 158          * software.
 159          */
 160
 161         if ((arg = getarg(args, 'h')) != NULL) {
 162                 if (strcmp(arg->val, "-") == 0)
 163                         grp->gr_passwd = "*";   /* No access */
 164                 else {
 165                         int             fd = atoi(arg->val);
 166                         int             b;
 167                         int             istty = isatty(fd);
 168                         struct termios  t;
 169                         char           *p, line[256];
 170
 171                         if (istty) {
 172                                 if (tcgetattr(fd, &t) == -1)
 173                                         istty = 0;
 174                                 else {
 175                                         struct termios  n = t;
 176
 177                                         /* Disable echo */
 178                                         n.c_lflag &= ~(ECHO);
 179                                         tcsetattr(fd, TCSANOW, &n);
 180                                         printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name);
 181                                         fflush(stdout);
 182                                 }
 183                         }
 184                         b = read(fd, line, sizeof(line) - 1);
 185                         if (istty) {    /* Restore state */
 186                                 tcsetattr(fd, TCSANOW, &t);
 187                                 fputc('\n', stdout);
 188                                 fflush(stdout);
 189                         }
 190                         if (b < 0) {
 191                                 warn("-h file descriptor");
 192                                 return EX_OSERR;
 193                         }
 194                         line[b] = '\0';
 195                         if ((p = strpbrk(line, " \t\r\n")) != NULL)
 196                                 *p = '\0';
 197                         if (!*line)
 198                                 errx(EX_DATAERR, "empty password read on file descriptor %d", fd);
 199                         grp->gr_passwd = pw_pwcrypt(line);
 200                 }
 201         }
 202
 203         if (((arg = getarg(args, 'M')) != NULL || (arg = getarg(args, 'm')) != NULL) && arg->val) {
 204                 int     i = 0;
 205                 char   *p;
 206                 struct passwd   *pwd;
 207
 208                 /* Make sure this is not stay NULL with -M "" */
 209                 extendarray(&members, &grmembers, 200);
 210                 if (arg->ch == 'm') {
 211                         int     k = 0;
 212
 213                         while (grp->gr_mem[k] != NULL) {
 214                                 if (extendarray(&members, &grmembers, i + 2) != -1) {
 215                                         members[i++] = grp->gr_mem[k];
 216                                 }
 217                                 k++;
 218                         }
 219                 }
 220                 for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
 221                         int     j;
 222                         if ((pwd = GETPWNAM(p)) == NULL) {
 223                                 if (!isdigit((unsigned char)*p) || (pwd = getpwuid((uid_t) atoi(p))) == NULL)
 224                                         errx(EX_NOUSER, "user `%s' does not exist", p);
 225                         }
 226                         /*
 227                          * Check for duplicates
 228                          */
 229                         for (j = 0; j < i && strcmp(members[j], pwd->pw_name)!=0; j++)
 230                                 ;
 231                         if (j == i && extendarray(&members, &grmembers, i + 2) != -1)
 232                                 members[i++] = newstr(pwd->pw_name);
 233                 }
 234                 while (i < grmembers)
 235                         members[i++] = NULL;
 236                 grp->gr_mem = members;
 237         }
 238
 239         if (getarg(args, 'N') != NULL)
 240                 return print_group(grp, getarg(args, 'P') != NULL);
 241
 242         if (mode == M_ADD && (rc = addgrent(grp)) != 0) {
 243                 if (rc == -1)
 244                         warnx("group '%s' already exists", grp->gr_name);
 245                 else
 246                         warn("group update");
 247                 return EX_IOERR;
 248         } else if (mode == M_UPDATE && (rc = chggrent(a_name->val, grp)) != 0) {
 249                 if (rc == -1)
 250                         warnx("group '%s' not available (NIS?)", grp->gr_name);
 251                 else
 252                         warn("group update");
 253                 return EX_IOERR;
 254         }
 255         /* grp may have been invalidated */
 256         if ((grp = GETGRNAM(a_name->val)) == NULL)
 257                 errx(EX_SOFTWARE, "group disappeared during update");
 258
 259         pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid);
 260
 261         if (members)
 262                 free(members);
 263
 264         return EXIT_SUCCESS;
 265 }
 266
 267
 268 static          gid_t
 269 gr_gidpolicy(struct userconf * cnf, struct cargs * args)
 270 {
 271         struct group   *grp;
 272         gid_t           gid = (gid_t) - 1;
 273         struct carg    *a_gid = getarg(args, 'g');
 274
 275         /*
 276          * Check the given gid, if any
 277          */
 278         if (a_gid != NULL) {
 279                 gid = (gid_t) atol(a_gid->val);
 280
 281                 if ((grp = GETGRGID(gid)) != NULL && getarg(args, 'o') == NULL)
 282                         errx(EX_DATAERR, "gid `%ld' has already been allocated", (long) grp->gr_gid);
 283         } else {
 284                 struct bitmap   bm;
 285
 286                 /*
 287                  * We need to allocate the next available gid under one of
 288                  * two policies a) Grab the first unused gid b) Grab the
 289                  * highest possible unused gid
 290                  */
 291                 if (cnf->min_gid >= cnf->max_gid) {     /* Sanity claus^H^H^H^Hheck */
 292                         cnf->min_gid = 1000;
 293                         cnf->max_gid = 32000;
 294                 }
 295                 bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
 296
 297                 /*
 298                  * Now, let's fill the bitmap from the password file
 299                  */
 300                 SETGRENT();
 301                 while ((grp = GETGRENT()) != NULL)
 302                         if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid &&
 303                             (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid)
 304                                 bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
 305                 ENDGRENT();
 306
 307                 /*
 308                  * Then apply the policy, with fallback to reuse if necessary
 309                  */
 310                 if (cnf->reuse_gids)
 311                         gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 312                 else {
 313                         gid = (gid_t) (bm_lastset(&bm) + 1);
 314                         if (!bm_isset(&bm, gid))
 315                                 gid += cnf->min_gid;
 316                         else
 317                                 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 318                 }
 319
 320                 /*
 321                  * Another sanity check
 322                  */
 323                 if (gid < cnf->min_gid || gid > cnf->max_gid)
 324                         errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
 325                 bm_dealloc(&bm);
 326         }
 327         return gid;
 328 }
 329
 330
 331 static int
 332 print_group(struct group * grp, int pretty)
 333 {
 334         if (!pretty) {
 335                 int             buflen = 0;
 336                 char           *buf = NULL;
 337
 338                 fmtgrent(&buf, &buflen, grp);
 339                 fputs(buf, stdout);
 340                 free(buf);
 341         } else {
 342                 int             i;
 343
 344                 printf("Group Name: %-15s   #%lu\n"
 345                        "   Members: ",
 346                        grp->gr_name, (long) grp->gr_gid);
 347                 for (i = 0; grp->gr_mem[i]; i++)
 348                         printf("%s%s", i ? "," : "", grp->gr_mem[i]);
 349                 fputs("\n\n", stdout);
 350         }
 351         return EXIT_SUCCESS;
 352 }