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         "$Id: pw_group.c,v 1.7 1997/10/10 06:23:36 charnier Exp $";
  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         struct carg    *a_name = getarg(args, 'n');
  48         struct carg    *a_gid = getarg(args, 'g');
  49         struct carg    *arg;
  50         struct group   *grp = NULL;
  51         int             grmembers = 0;
  52         char          **members = NULL;
  53
  54         static struct group fakegroup =
  55         {
  56                 "nogroup",
  57                 "*",
  58                 -1,
  59                 NULL
  60         };
  61
  62         /*
  63          * With M_NEXT, we only need to return the
  64          * next gid to stdout
  65          */
  66         if (mode == M_NEXT)
  67         {
  68                 gid_t next = gr_gidpolicy(cnf, args);
  69                 if (getarg(args, 'q'))
  70                         return next;
  71                 printf("%ld\n", (long)next);
  72                 return EXIT_SUCCESS;
  73         }
  74
  75         if (mode == M_PRINT && getarg(args, 'a')) {
  76                 int             pretty = getarg(args, 'P') != NULL;
  77
  78                 SETGRENT();
  79                 while ((grp = GETGRENT()) != NULL)
  80                         print_group(grp, pretty);
  81                 ENDGRENT();
  82                 return EXIT_SUCCESS;
  83         }
  84         if (a_gid == NULL) {
  85                 if (a_name == NULL)
  86                         errx(EX_DATAERR, "group name or id required");
  87
  88                 if (mode != M_ADD && grp == NULL && isdigit(*a_name->val)) {
  89                         (a_gid = a_name)->ch = 'g';
  90                         a_name = NULL;
  91                 }
  92         }
  93         grp = (a_name != NULL) ? GETGRNAM(a_name->val) : GETGRGID((gid_t) atoi(a_gid->val));
  94
  95         if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
  96                 if (a_name == NULL && grp == NULL)      /* Try harder */
  97                         grp = GETGRGID(atoi(a_gid->val));
  98
  99                 if (grp == NULL) {
 100                         if (mode == M_PRINT && getarg(args, 'F')) {
 101                                 char    *fmems[1];
 102                                 fmems[0] = NULL;
 103                                 fakegroup.gr_name = a_name ? a_name->val : "nogroup";
 104                                 fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1;
 105                                 fakegroup.gr_mem = fmems;
 106                                 return print_group(&fakegroup, getarg(args, 'P') != NULL);
 107                         }
 108                         errx(EX_DATAERR, "unknown group `%s'", a_name ? a_name->val : a_gid->val);
 109                 }
 110                 if (a_name == NULL)     /* Needed later */
 111                         a_name = addarg(args, 'n', grp->gr_name);
 112
 113                 /*
 114                  * Handle deletions now
 115                  */
 116                 if (mode == M_DELETE) {
 117                         gid_t           gid = grp->gr_gid;
 118
 119                         if (delgrent(grp) == -1)
 120                                 err(EX_IOERR, "error updating group file");
 121                         pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid);
 122                         return EXIT_SUCCESS;
 123                 } else if (mode == M_PRINT)
 124                         return print_group(grp, getarg(args, 'P') != NULL);
 125
 126                 if (a_gid)
 127                         grp->gr_gid = (gid_t) atoi(a_gid->val);
 128
 129                 if ((arg = getarg(args, 'l')) != NULL)
 130                         grp->gr_name = pw_checkname((u_char *)arg->val, 0);
 131         } else {
 132                 if (a_name == NULL)     /* Required */
 133                         errx(EX_DATAERR, "group name required");
 134                 else if (grp != NULL)   /* Exists */
 135                         errx(EX_DATAERR, "group name `%s' already exists", a_name->val);
 136
 137                 extendarray(&members, &grmembers, 200);
 138                 members[0] = NULL;
 139                 grp = &fakegroup;
 140                 grp->gr_name = pw_checkname((u_char *)a_name->val, 0);
 141                 grp->gr_passwd = "*";
 142                 grp->gr_gid = gr_gidpolicy(cnf, args);
 143                 grp->gr_mem = members;
 144         }
 145
 146         /*
 147          * This allows us to set a group password Group passwords is an
 148          * antique idea, rarely used and insecure (no secure database) Should
 149          * be discouraged, but it is apparently still supported by some
 150          * software.
 151          */
 152
 153         if ((arg = getarg(args, 'h')) != NULL) {
 154                 if (strcmp(arg->val, "-") == 0)
 155                         grp->gr_passwd = "*";   /* No access */
 156                 else {
 157                         int             fd = atoi(arg->val);
 158                         int             b;
 159                         int             istty = isatty(fd);
 160                         struct termios  t;
 161                         char           *p, line[256];
 162
 163                         if (istty) {
 164                                 if (tcgetattr(fd, &t) == -1)
 165                                         istty = 0;
 166                                 else {
 167                                         struct termios  n = t;
 168
 169                                         /* Disable echo */
 170                                         n.c_lflag &= ~(ECHO);
 171                                         tcsetattr(fd, TCSANOW, &n);
 172                                         printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name);
 173                                         fflush(stdout);
 174                                 }
 175                         }
 176                         b = read(fd, line, sizeof(line) - 1);
 177                         if (istty) {    /* Restore state */
 178                                 tcsetattr(fd, TCSANOW, &t);
 179                                 fputc('\n', stdout);
 180                                 fflush(stdout);
 181                         }
 182                         if (b < 0) {
 183                                 warn("-h file descriptor");
 184                                 return EX_OSERR;
 185                         }
 186                         line[b] = '\0';
 187                         if ((p = strpbrk(line, " \t\r\n")) != NULL)
 188                                 *p = '\0';
 189                         if (!*line)
 190                                 errx(EX_DATAERR, "empty password read on file descriptor %d", fd);
 191                         grp->gr_passwd = pw_pwcrypt(line);
 192                 }
 193         }
 194
 195         if (((arg = getarg(args, 'M')) != NULL || (arg = getarg(args, 'm')) != NULL) && arg->val) {
 196                 int     i = 0;
 197                 char   *p;
 198                 struct passwd   *pwd;
 199
 200                 /* Make sure this is not stay NULL with -M "" */
 201                 extendarray(&members, &grmembers, 200);
 202                 if (arg->ch == 'm') {
 203                         int     k = 0;
 204
 205                         while (grp->gr_mem[k] != NULL) {
 206                                 if (extendarray(&members, &grmembers, i + 2) != -1) {
 207                                         members[i++] = grp->gr_mem[k];
 208                                 }
 209                                 k++;
 210                         }
 211                 }
 212                 for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
 213                         int     j;
 214                         if ((pwd = GETPWNAM(p)) == NULL) {
 215                                 if (!isdigit(*p) || (pwd = getpwuid((uid_t) atoi(p))) == NULL)
 216                                         errx(EX_NOUSER, "user `%s' does not exist", p);
 217                         }
 218                         /*
 219                          * Check for duplicates
 220                          */
 221                         for (j = 0; j < i && strcmp(members[j], pwd->pw_name)!=0; j++)
 222                                 ;
 223                         if (j == i && extendarray(&members, &grmembers, i + 2) != -1)
 224                                 members[i++] = newstr(pwd->pw_name);
 225                 }
 226                 while (i < grmembers)
 227                         members[i++] = NULL;
 228                 grp->gr_mem = members;
 229         }
 230
 231         if (getarg(args, 'N') != NULL)
 232                 return print_group(grp, getarg(args, 'P') != NULL);
 233
 234         if ((mode == M_ADD && !addgrent(grp)) || (mode == M_UPDATE && !chggrent(a_name->val, grp))) {
 235                 warn("group update");
 236                 return EX_IOERR;
 237         }
 238         /* grp may have been invalidated */
 239         if ((grp = GETGRNAM(a_name->val)) == NULL)
 240                 errx(EX_SOFTWARE, "group disappeared during update");
 241
 242         pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid);
 243
 244         if (members)
 245                 free(members);
 246
 247         return EXIT_SUCCESS;
 248 }
 249
 250
 251 static          gid_t
 252 gr_gidpolicy(struct userconf * cnf, struct cargs * args)
 253 {
 254         struct group   *grp;
 255         gid_t           gid = (gid_t) - 1;
 256         struct carg    *a_gid = getarg(args, 'g');
 257
 258         /*
 259          * Check the given gid, if any
 260          */
 261         if (a_gid != NULL) {
 262                 gid = (gid_t) atol(a_gid->val);
 263
 264                 if ((grp = GETGRGID(gid)) != NULL && getarg(args, 'o') == NULL)
 265                         errx(EX_DATAERR, "gid `%ld' has already been allocated", (long) grp->gr_gid);
 266         } else {
 267                 struct bitmap   bm;
 268
 269                 /*
 270                  * We need to allocate the next available gid under one of
 271                  * two policies a) Grab the first unused gid b) Grab the
 272                  * highest possible unused gid
 273                  */
 274                 if (cnf->min_gid >= cnf->max_gid) {     /* Sanity claus^H^H^H^Hheck */
 275                         cnf->min_gid = 1000;
 276                         cnf->max_gid = 32000;
 277                 }
 278                 bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
 279
 280                 /*
 281                  * Now, let's fill the bitmap from the password file
 282                  */
 283                 SETGRENT();
 284                 while ((grp = GETGRENT()) != NULL)
 285                         if (grp->gr_gid >= (int) cnf->min_gid && grp->gr_gid <= (int) cnf->max_gid)
 286                                 bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
 287                 ENDGRENT();
 288
 289                 /*
 290                  * Then apply the policy, with fallback to reuse if necessary
 291                  */
 292                 if (cnf->reuse_gids)
 293                         gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 294                 else {
 295                         gid = (gid_t) (bm_lastset(&bm) + 1);
 296                         if (!bm_isset(&bm, gid))
 297                                 gid += cnf->min_gid;
 298                         else
 299                                 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 300                 }
 301
 302                 /*
 303                  * Another sanity check
 304                  */
 305                 if (gid < cnf->min_gid || gid > cnf->max_gid)
 306                         errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
 307                 bm_dealloc(&bm);
 308         }
 309         return gid;
 310 }
 311
 312
 313 static int
 314 print_group(struct group * grp, int pretty)
 315 {
 316         if (!pretty) {
 317                 int             buflen = 0;
 318                 char           *buf = NULL;
 319
 320                 fmtgrent(&buf, &buflen, grp);
 321                 fputs(buf, stdout);
 322                 free(buf);
 323         } else {
 324                 int             i;
 325
 326                 printf("Group Name: %-15s   #%lu\n"
 327                        "   Members: ",
 328                        grp->gr_name, (long) grp->gr_gid);
 329                 for (i = 0; grp->gr_mem[i]; i++)
 330                         printf("%s%s", i ? "," : "", grp->gr_mem[i]);
 331                 fputs("\n\n", stdout);
 332         }
 333         return EXIT_SUCCESS;
 334 }