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             (arg = getarg(args, 'H')) != NULL) {
 163                 if (strcmp(arg->val, "-") == 0)
 164                         grp->gr_passwd = "*";   /* No access */
 165                 else {
 166                         int             fd = atoi(arg->val);
 167                         int             precrypt = (arg->ch == 'H');
 168                         int             b;
 169                         int             istty = isatty(fd);
 170                         struct termios  t;
 171                         char           *p, line[256];
 172
 173                         if (istty) {
 174                                 if (tcgetattr(fd, &t) == -1)
 175                                         istty = 0;
 176                                 else {
 177                                         struct termios  n = t;
 178
 179                                         /* Disable echo */
 180                                         n.c_lflag &= ~(ECHO);
 181                                         tcsetattr(fd, TCSANOW, &n);
 182                                         printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name);
 183                                         fflush(stdout);
 184                                 }
 185                         }
 186                         b = read(fd, line, sizeof(line) - 1);
 187                         if (istty) {    /* Restore state */
 188                                 tcsetattr(fd, TCSANOW, &t);
 189                                 fputc('\n', stdout);
 190                                 fflush(stdout);
 191                         }
 192                         if (b < 0) {
 193                                 warn("-h file descriptor");
 194                                 return EX_OSERR;
 195                         }
 196                         line[b] = '\0';
 197                         if ((p = strpbrk(line, " \t\r\n")) != NULL)
 198                                 *p = '\0';
 199                         if (!*line)
 200                                 errx(EX_DATAERR, "empty password read on file descriptor %d", fd);
 201                         if (precrypt) {
 202                                 if (strchr(line, ':') != NULL)
 203                                         return EX_DATAERR;
 204                                 grp->gr_passwd = line;
 205                         } else
 206                                 grp->gr_passwd = pw_pwcrypt(line);
 207                 }
 208         }
 209
 210         if (((arg = getarg(args, 'M')) != NULL || (arg = getarg(args, 'm')) != NULL) && arg->val) {
 211                 int     i = 0;
 212                 char   *p;
 213                 struct passwd   *pwd;
 214
 215                 /* Make sure this is not stay NULL with -M "" */
 216                 extendarray(&members, &grmembers, 200);
 217                 if (arg->ch == 'm') {
 218                         int     k = 0;
 219
 220                         while (grp->gr_mem[k] != NULL) {
 221                                 if (extendarray(&members, &grmembers, i + 2) != -1) {
 222                                         members[i++] = grp->gr_mem[k];
 223                                 }
 224                                 k++;
 225                         }
 226                 }
 227                 for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
 228                         int     j;
 229                         if ((pwd = GETPWNAM(p)) == NULL) {
 230                                 if (!isdigit((unsigned char)*p) || (pwd = getpwuid((uid_t) atoi(p))) == NULL)
 231                                         errx(EX_NOUSER, "user `%s' does not exist", p);
 232                         }
 233                         /*
 234                          * Check for duplicates
 235                          */
 236                         for (j = 0; j < i && strcmp(members[j], pwd->pw_name)!=0; j++)
 237                                 ;
 238                         if (j == i && extendarray(&members, &grmembers, i + 2) != -1)
 239                                 members[i++] = newstr(pwd->pw_name);
 240                 }
 241                 while (i < grmembers)
 242                         members[i++] = NULL;
 243                 grp->gr_mem = members;
 244         }
 245
 246         if (getarg(args, 'N') != NULL)
 247                 return print_group(grp, getarg(args, 'P') != NULL);
 248
 249         if (mode == M_ADD && (rc = addgrent(grp)) != 0) {
 250                 if (rc == -1)
 251                         warnx("group '%s' already exists", grp->gr_name);
 252                 else
 253                         warn("group update");
 254                 return EX_IOERR;
 255         } else if (mode == M_UPDATE && (rc = chggrent(a_name->val, grp)) != 0) {
 256                 if (rc == -1)
 257                         warnx("group '%s' not available (NIS?)", grp->gr_name);
 258                 else
 259                         warn("group update");
 260                 return EX_IOERR;
 261         }
 262         /* grp may have been invalidated */
 263         if ((grp = GETGRNAM(a_name->val)) == NULL)
 264                 errx(EX_SOFTWARE, "group disappeared during update");
 265
 266         pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid);
 267
 268         if (members)
 269                 free(members);
 270
 271         return EXIT_SUCCESS;
 272 }
 273
 274
 275 static          gid_t
 276 gr_gidpolicy(struct userconf * cnf, struct cargs * args)
 277 {
 278         struct group   *grp;
 279         gid_t           gid = (gid_t) - 1;
 280         struct carg    *a_gid = getarg(args, 'g');
 281
 282         /*
 283          * Check the given gid, if any
 284          */
 285         if (a_gid != NULL) {
 286                 gid = (gid_t) atol(a_gid->val);
 287
 288                 if ((grp = GETGRGID(gid)) != NULL && getarg(args, 'o') == NULL)
 289                         errx(EX_DATAERR, "gid `%ld' has already been allocated", (long) grp->gr_gid);
 290         } else {
 291                 struct bitmap   bm;
 292
 293                 /*
 294                  * We need to allocate the next available gid under one of
 295                  * two policies a) Grab the first unused gid b) Grab the
 296                  * highest possible unused gid
 297                  */
 298                 if (cnf->min_gid >= cnf->max_gid) {     /* Sanity claus^H^H^H^Hheck */
 299                         cnf->min_gid = 1000;
 300                         cnf->max_gid = 32000;
 301                 }
 302                 bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
 303
 304                 /*
 305                  * Now, let's fill the bitmap from the password file
 306                  */
 307                 SETGRENT();
 308                 while ((grp = GETGRENT()) != NULL)
 309                         if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid &&
 310                             (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid)
 311                                 bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
 312                 ENDGRENT();
 313
 314                 /*
 315                  * Then apply the policy, with fallback to reuse if necessary
 316                  */
 317                 if (cnf->reuse_gids)
 318                         gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 319                 else {
 320                         gid = (gid_t) (bm_lastset(&bm) + 1);
 321                         if (!bm_isset(&bm, gid))
 322                                 gid += cnf->min_gid;
 323                         else
 324                                 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 325                 }
 326
 327                 /*
 328                  * Another sanity check
 329                  */
 330                 if (gid < cnf->min_gid || gid > cnf->max_gid)
 331                         errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
 332                 bm_dealloc(&bm);
 333         }
 334         return gid;
 335 }
 336
 337
 338 static int
 339 print_group(struct group * grp, int pretty)
 340 {
 341         if (!pretty) {
 342                 int             buflen = 0;
 343                 char           *buf = NULL;
 344
 345                 fmtgrent(&buf, &buflen, grp);
 346                 fputs(buf, stdout);
 347                 free(buf);
 348         } else {
 349                 int             i;
 350
 351                 printf("Group Name: %-15s   #%lu\n"
 352                        "   Members: ",
 353                        grp->gr_name, (long) grp->gr_gid);
 354                 for (i = 0; grp->gr_mem[i]; i++)
 355                         printf("%s%s", i ? "," : "", grp->gr_mem[i]);
 356                 fputs("\n\n", stdout);
 357         }
 358         return EXIT_SUCCESS;
 359 }