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  *      $Id: pw_group.c,v 1.2 1996/12/19 15:22:44 davidn Exp $
  27  */
  28
  29 #include <unistd.h>
  30 #include <ctype.h>
  31 #include <termios.h>
  32
  33 #include "pw.h"
  34 #include "bitmap.h"
  35 #include "pwupd.h"
  36
  37
  38 static int      print_group(struct group * grp, int pretty);
  39 static gid_t    gr_gidpolicy(struct userconf * cnf, struct cargs * args);
  40
  41 int
  42 pw_group(struct userconf * cnf, int mode, struct cargs * args)
  43 {
  44         struct carg    *a_name = getarg(args, 'n');
  45         struct carg    *a_gid = getarg(args, 'g');
  46         struct carg    *arg;
  47         struct group   *grp = NULL;
  48         int             grmembers = 0;
  49         char          **members = NULL;
  50
  51         static struct group fakegroup =
  52         {
  53                 "nogroup",
  54                 "*",
  55                 -1,
  56                 NULL
  57         };
  58
  59         /*
  60          * With M_NEXT, we only need to return the
  61          * next gid to stdout
  62          */
  63         if (mode == M_NEXT)
  64         {
  65                 gid_t next = gr_gidpolicy(cnf, args);
  66                 if (getarg(args, 'q'))
  67                         return next;
  68                 printf("%ld\n", (long)next);
  69                 return EXIT_SUCCESS;
  70         }
  71
  72         if (mode == M_PRINT && getarg(args, 'a')) {
  73                 int             pretty = getarg(args, 'P') != NULL;
  74
  75                 setgrent();
  76                 while ((grp = getgrent()) != NULL)
  77                         print_group(grp, pretty);
  78                 endgrent();
  79                 return EXIT_SUCCESS;
  80         }
  81         if (a_gid == NULL) {
  82                 if (a_name == NULL)
  83                         cmderr(EX_DATAERR, "group name or id required\n");
  84
  85                 if (mode != M_ADD && grp == NULL && isdigit(*a_name->val)) {
  86                         (a_gid = a_name)->ch = 'g';
  87                         a_name = NULL;
  88                 }
  89         }
  90         grp = (a_name != NULL) ? getgrnam(a_name->val) : getgrgid((gid_t) atoi(a_gid->val));
  91
  92         if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
  93                 if (a_name == NULL && grp == NULL)      /* Try harder */
  94                         grp = getgrgid(atoi(a_gid->val));
  95
  96                 if (grp == NULL) {
  97                         if (mode == M_PRINT && getarg(args, 'F')) {
  98                                 char    *fmems[1];
  99                                 fmems[0] = NULL;
 100                                 fakegroup.gr_name = a_name ? a_name->val : "nogroup";
 101                                 fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1;
 102                                 fakegroup.gr_mem = fmems;
 103                                 return print_group(&fakegroup, getarg(args, 'P') != NULL);
 104                         }
 105                         cmderr(EX_DATAERR, "unknown group `%s'\n", a_name ? a_name->val : a_gid->val);
 106                 }
 107                 if (a_name == NULL)     /* Needed later */
 108                         a_name = addarg(args, 'n', grp->gr_name);
 109
 110                 /*
 111                  * Handle deletions now
 112                  */
 113                 if (mode == M_DELETE) {
 114                         gid_t           gid = grp->gr_gid;
 115
 116                         if (delgrent(grp) == -1)
 117                                 cmderr(EX_IOERR, "Error updating group file: %s\n", strerror(errno));
 118                         pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid);
 119                         return EXIT_SUCCESS;
 120                 } else if (mode == M_PRINT)
 121                         return print_group(grp, getarg(args, 'P') != NULL);
 122
 123                 if (a_gid)
 124                         grp->gr_gid = (gid_t) atoi(a_gid->val);
 125
 126                 if ((arg = getarg(args, 'l')) != NULL)
 127                         grp->gr_name = pw_checkname((u_char *)arg->val, 0);
 128         } else {
 129                 if (a_name == NULL)     /* Required */
 130                         cmderr(EX_DATAERR, "group name required\n");
 131                 else if (grp != NULL)   /* Exists */
 132                         cmderr(EX_DATAERR, "group name `%s' already exists\n", a_name->val);
 133
 134                 extendarray(&members, &grmembers, 200);
 135                 members[0] = NULL;
 136                 grp = &fakegroup;
 137                 grp->gr_name = pw_checkname((u_char *)a_name->val, 0);
 138                 grp->gr_passwd = "*";
 139                 grp->gr_gid = gr_gidpolicy(cnf, args);
 140                 grp->gr_mem = members;
 141         }
 142
 143         /*
 144          * This allows us to set a group password Group passwords is an
 145          * antique idea, rarely used and insecure (no secure database) Should
 146          * be discouraged, but it is apparently still supported by some
 147          * software.
 148          */
 149
 150         if ((arg = getarg(args, 'h')) != NULL) {
 151                 if (strcmp(arg->val, "-") == 0)
 152                         grp->gr_passwd = "*";   /* No access */
 153                 else {
 154                         int             fd = atoi(arg->val);
 155                         int             b;
 156                         int             istty = isatty(fd);
 157                         struct termios  t;
 158                         char           *p, line[256];
 159
 160                         if (istty) {
 161                                 if (tcgetattr(fd, &t) == -1)
 162                                         istty = 0;
 163                                 else {
 164                                         struct termios  n = t;
 165
 166                                         /* Disable echo */
 167                                         n.c_lflag &= ~(ECHO);
 168                                         tcsetattr(fd, TCSANOW, &n);
 169                                         printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name);
 170                                         fflush(stdout);
 171                                 }
 172                         }
 173                         b = read(fd, line, sizeof(line) - 1);
 174                         if (istty) {    /* Restore state */
 175                                 tcsetattr(fd, TCSANOW, &t);
 176                                 fputc('\n', stdout);
 177                                 fflush(stdout);
 178                         }
 179                         if (b < 0) {
 180                                 perror("-h file descriptor");
 181                                 return EX_OSERR;
 182                         }
 183                         line[b] = '\0';
 184                         if ((p = strpbrk(line, " \t\r\n")) != NULL)
 185                                 *p = '\0';
 186                         if (!*line)
 187                                 cmderr(EX_DATAERR, "empty password read on file descriptor %d\n", fd);
 188                         grp->gr_passwd = pw_pwcrypt(line);
 189                 }
 190         }
 191
 192         if (((arg = getarg(args, 'M')) != NULL || (arg = getarg(args, 'm')) != NULL) && arg->val) {
 193                 int     i = 0;
 194                 char   *p;
 195                 struct passwd   *pwd;
 196
 197                 /* Make sure this is not stay NULL with -M "" */
 198                 extendarray(&members, &grmembers, 200);
 199                 if (arg->ch == 'm') {
 200                         int     k = 0;
 201
 202                         while (grp->gr_mem[k] != NULL) {
 203                                 if (extendarray(&members, &grmembers, i + 2) != -1) {
 204                                         members[i++] = grp->gr_mem[k];
 205                                 }
 206                                 k++;
 207                         }
 208                 }
 209                 for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
 210                         int     j;
 211                         if ((pwd = getpwnam(p)) == NULL) {
 212                                 if (!isdigit(*p) || (pwd = getpwuid((uid_t) atoi(p))) == NULL)
 213                                         cmderr(EX_NOUSER, "user `%s' does not exist\n", p);
 214                         }
 215                         /*
 216                          * Check for duplicates
 217                          */
 218                         for (j = 0; j < i && strcmp(members[j], pwd->pw_name)!=0; j++)
 219                                 ;
 220                         if (j == i && extendarray(&members, &grmembers, i + 2) != -1)
 221                                 members[i++] = newstr(pwd->pw_name);
 222                 }
 223                 while (i < grmembers)
 224                         members[i++] = NULL;
 225                 grp->gr_mem = members;
 226         }
 227
 228         if (getarg(args, 'N') != NULL)
 229                 return print_group(grp, getarg(args, 'P') != NULL);
 230
 231         if ((mode == M_ADD && !addgrent(grp)) || (mode == M_UPDATE && !chggrent(a_name->val, grp))) {
 232                 perror("group update");
 233                 return EX_IOERR;
 234         }
 235         /* grp may have been invalidated */
 236         if ((grp = getgrnam(a_name->val)) == NULL)
 237                 cmderr(EX_SOFTWARE, "group disappeared during update\n");
 238
 239         pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid);
 240
 241         if (members)
 242                 free(members);
 243
 244         return EXIT_SUCCESS;
 245 }
 246
 247
 248 static          gid_t
 249 gr_gidpolicy(struct userconf * cnf, struct cargs * args)
 250 {
 251         struct group   *grp;
 252         gid_t           gid = (gid_t) - 1;
 253         struct carg    *a_gid = getarg(args, 'g');
 254
 255         /*
 256          * Check the given gid, if any
 257          */
 258         if (a_gid != NULL) {
 259                 gid = (gid_t) atol(a_gid->val);
 260
 261                 if ((grp = getgrgid(gid)) != NULL && getarg(args, 'o') == NULL)
 262                         cmderr(EX_DATAERR, "gid `%ld' has already been allocated\n", (long) grp->gr_gid);
 263         } else {
 264                 struct bitmap   bm;
 265
 266                 /*
 267                  * We need to allocate the next available gid under one of
 268                  * two policies a) Grab the first unused gid b) Grab the
 269                  * highest possible unused gid
 270                  */
 271                 if (cnf->min_gid >= cnf->max_gid) {     /* Sanity claus^H^H^H^Hheck */
 272                         cnf->min_gid = 1000;
 273                         cnf->max_gid = 32000;
 274                 }
 275                 bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
 276
 277                 /*
 278                  * Now, let's fill the bitmap from the password file
 279                  */
 280                 setgrent();
 281                 while ((grp = getgrent()) != NULL)
 282                         if (grp->gr_gid >= (int) cnf->min_gid && grp->gr_gid <= (int) cnf->max_gid)
 283                                 bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
 284                 endgrent();
 285
 286                 /*
 287                  * Then apply the policy, with fallback to reuse if necessary
 288                  */
 289                 if (cnf->reuse_gids)
 290                         gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 291                 else {
 292                         gid = (gid_t) (bm_lastset(&bm) + 1);
 293                         if (!bm_isset(&bm, gid))
 294                                 gid += cnf->min_gid;
 295                         else
 296                                 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 297                 }
 298
 299                 /*
 300                  * Another sanity check
 301                  */
 302                 if (gid < cnf->min_gid || gid > cnf->max_gid)
 303                         cmderr(EX_SOFTWARE, "unable to allocate a new gid - range fully used\n");
 304                 bm_dealloc(&bm);
 305         }
 306         return gid;
 307 }
 308
 309
 310 static int
 311 print_group(struct group * grp, int pretty)
 312 {
 313         if (!pretty) {
 314                 int             buflen = 0;
 315                 char           *buf = NULL;
 316
 317                 fmtgrent(&buf, &buflen, grp);
 318                 fputs(buf, stdout);
 319                 free(buf);
 320         } else {
 321                 int             i;
 322
 323                 printf("Group Name: %-10s   #%lu\n"
 324                        "   Members: ",
 325                        grp->gr_name, (long) grp->gr_gid);
 326                 for (i = 0; grp->gr_mem[i]; i++)
 327                         printf("%s%s", i ? "," : "", grp->gr_mem[i]);
 328                 fputs("\n\n", stdout);
 329         }
 330         return EXIT_SUCCESS;
 331 }