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 1.1.1.2 1996/12/09 23:55:25 joerg 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
  36
  37 static int      print_group(struct group * grp, int pretty);
  38 static gid_t    gr_gidpolicy(struct userconf * cnf, struct cargs * args);
  39
  40 int
  41 pw_group(struct userconf * cnf, int mode, struct cargs * args)
  42 {
  43         struct carg    *a_name = getarg(args, 'n');
  44         struct carg    *a_gid = getarg(args, 'g');
  45         struct carg    *arg;
  46         struct group   *grp = NULL;
  47         char           *members[_UC_MAXGROUPS];
  48
  49         static struct group fakegroup =
  50         {
  51                 "nogroup",
  52                 "*",
  53                 -1,
  54                 NULL
  55         };
  56
  57         /*
  58          * With M_NEXT, we only need to return the
  59          * next gid to stdout
  60          */
  61         if (mode == M_NEXT)
  62         {
  63                 gid_t next = gr_gidpolicy(cnf, args);
  64                 if (getarg(args, 'q'))
  65                         return next;
  66                 printf("%ld\n", (long)next);
  67                 return EXIT_SUCCESS;
  68         }
  69
  70         if (mode == M_PRINT && getarg(args, 'a')) {
  71                 int             pretty = getarg(args, 'P') != NULL;
  72
  73                 setgrent();
  74                 while ((grp = getgrent()) != NULL)
  75                         print_group(grp, pretty);
  76                 endgrent();
  77                 return EXIT_SUCCESS;
  78         }
  79         if (a_gid == NULL) {
  80                 if (a_name == NULL)
  81                         cmderr(EX_DATAERR, "group name or id required\n");
  82
  83                 if (mode != M_ADD && grp == NULL && isdigit(*a_name->val)) {
  84                         (a_gid = a_name)->ch = 'g';
  85                         a_name = NULL;
  86                 }
  87         }
  88         grp = (a_name != NULL) ? getgrnam(a_name->val) : getgrgid((gid_t) atoi(a_gid->val));
  89
  90         if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
  91                 if (a_name == NULL && grp == NULL)      /* Try harder */
  92                         grp = getgrgid(atoi(a_gid->val));
  93
  94                 if (grp == NULL) {
  95                         if (mode == M_PRINT && getarg(args, 'F')) {
  96                                 fakegroup.gr_name = a_name ? a_name->val : "nogroup";
  97                                 fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1;
  98                                 return print_group(&fakegroup, getarg(args, 'P') != NULL);
  99                         }
 100                         cmderr(EX_DATAERR, "unknown group `%s'\n", a_name ? a_name->val : a_gid->val);
 101                 }
 102                 if (a_name == NULL)     /* Needed later */
 103                         a_name = addarg(args, 'n', grp->gr_name);
 104
 105                 /*
 106                  * Handle deletions now
 107                  */
 108                 if (mode == M_DELETE) {
 109                         gid_t           gid = grp->gr_gid;
 110
 111                         if (delgrent(grp) == -1)
 112                                 cmderr(EX_IOERR, "Error updating group file: %s\n", strerror(errno));
 113                         pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid);
 114                         return EXIT_SUCCESS;
 115                 } else if (mode == M_PRINT)
 116                         return print_group(grp, getarg(args, 'P') != NULL);
 117
 118                 if (a_gid)
 119                         grp->gr_gid = (gid_t) atoi(a_gid->val);
 120
 121                 if ((arg = getarg(args, 'l')) != NULL)
 122                         grp->gr_name = arg->val;
 123         } else {
 124                 if (a_name == NULL)     /* Required */
 125                         cmderr(EX_DATAERR, "group name required\n");
 126                 else if (grp != NULL)   /* Exists */
 127                         cmderr(EX_DATAERR, "group name `%s' already exists\n", a_name->val);
 128
 129                 memset(members, 0, sizeof members);
 130                 grp = &fakegroup;
 131                 grp->gr_name = a_name->val;
 132                 grp->gr_passwd = "*";
 133                 grp->gr_gid = gr_gidpolicy(cnf, args);
 134                 grp->gr_mem = members;
 135         }
 136
 137         /*
 138          * This allows us to set a group password Group passwords is an
 139          * antique idea, rarely used and insecure (no secure database) Should
 140          * be discouraged, but it is apparently still supported by some
 141          * software.
 142          */
 143
 144         if ((arg = getarg(args, 'h')) != NULL) {
 145                 if (strcmp(arg->val, "-") == 0)
 146                         grp->gr_passwd = "*";   /* No access */
 147                 else {
 148                         int             fd = atoi(arg->val);
 149                         int             b;
 150                         int             istty = isatty(fd);
 151                         struct termios  t;
 152                         char           *p, line[256];
 153
 154                         if (istty) {
 155                                 if (tcgetattr(fd, &t) == -1)
 156                                         istty = 0;
 157                                 else {
 158                                         struct termios  n = t;
 159
 160                                         /* Disable echo */
 161                                         n.c_lflag &= ~(ECHO);
 162                                         tcsetattr(fd, TCSANOW, &n);
 163                                         printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name);
 164                                         fflush(stdout);
 165                                 }
 166                         }
 167                         b = read(fd, line, sizeof(line) - 1);
 168                         if (istty) {    /* Restore state */
 169                                 tcsetattr(fd, TCSANOW, &t);
 170                                 fputc('\n', stdout);
 171                                 fflush(stdout);
 172                         }
 173                         if (b < 0) {
 174                                 perror("-h file descriptor");
 175                                 return EX_OSERR;
 176                         }
 177                         line[b] = '\0';
 178                         if ((p = strpbrk(line, " \t\r\n")) != NULL)
 179                                 *p = '\0';
 180                         if (!*line)
 181                                 cmderr(EX_DATAERR, "empty password read on file descriptor %d\n", fd);
 182                         grp->gr_passwd = pw_pwcrypt(line);
 183                 }
 184         }
 185
 186         if (((arg = getarg(args, 'M')) != NULL || (arg = getarg(args, 'm')) != NULL) && arg->val) {
 187                 int     i = 0;
 188                 char   *p;
 189                 struct passwd   *pwd;
 190
 191                 if (arg->ch == 'm') {
 192                         while (i < _UC_MAXGROUPS && grp->gr_mem[i] != NULL) {
 193                                 members[i] = grp->gr_mem[i];
 194                                 i++;
 195                         }
 196                 }
 197                 for (p = strtok(arg->val, ", \t"); i < _UC_MAXGROUPS && p != NULL; p = strtok(NULL, ", \t")) {
 198                         int     j;
 199                         if ((pwd = getpwnam(p)) == NULL) {
 200                                 if (!isdigit(*p) || (pwd = getpwuid((uid_t) atoi(p))) == NULL)
 201                                         cmderr(EX_NOUSER, "user `%s' does not exist\n", p);
 202                         }
 203                         /*
 204                          * Check for duplicates
 205                          */
 206                         for (j = 0; j < i && strcmp(members[j], pwd->pw_name)!=0; j++)
 207                                 ;
 208                         if (j == i)
 209                                 members[i++] = newstr(pwd->pw_name);
 210                 }
 211                 while (i < _UC_MAXGROUPS)
 212                         members[i++] = NULL;
 213                 grp->gr_mem = members;
 214         }
 215
 216         if (getarg(args, 'N') != NULL)
 217                 return print_group(grp, getarg(args, 'P') != NULL);
 218
 219         if ((mode == M_ADD && !addgrent(grp)) || (mode == M_UPDATE && !chggrent(a_name->val, grp))) {
 220                 perror("group update");
 221                 return EX_IOERR;
 222         }
 223         /* grp may have been invalidated */
 224         if ((grp = getgrnam(a_name->val)) == NULL)
 225                 cmderr(EX_SOFTWARE, "group disappeared during update\n");
 226
 227         pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid);
 228
 229         return EXIT_SUCCESS;
 230 }
 231
 232
 233 static          gid_t
 234 gr_gidpolicy(struct userconf * cnf, struct cargs * args)
 235 {
 236         struct group   *grp;
 237         gid_t           gid = (gid_t) - 1;
 238         struct carg    *a_gid = getarg(args, 'g');
 239
 240         /*
 241          * Check the given gid, if any
 242          */
 243         if (a_gid != NULL) {
 244                 gid = (gid_t) atol(a_gid->val);
 245
 246                 if ((grp = getgrgid(gid)) != NULL && getarg(args, 'o') == NULL)
 247                         cmderr(EX_DATAERR, "gid `%ld' has already been allocated\n", (long) grp->gr_gid);
 248         } else {
 249                 struct bitmap   bm;
 250
 251                 /*
 252                  * We need to allocate the next available gid under one of
 253                  * two policies a) Grab the first unused gid b) Grab the
 254                  * highest possible unused gid
 255                  */
 256                 if (cnf->min_gid >= cnf->max_gid) {     /* Sanity claus^H^H^H^Hheck */
 257                         cnf->min_gid = 1000;
 258                         cnf->max_gid = 32000;
 259                 }
 260                 bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
 261
 262                 /*
 263                  * Now, let's fill the bitmap from the password file
 264                  */
 265                 setgrent();
 266                 while ((grp = getgrent()) != NULL)
 267                         if (grp->gr_gid >= (int) cnf->min_gid && grp->gr_gid <= (int) cnf->max_gid)
 268                                 bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
 269                 endgrent();
 270
 271                 /*
 272                  * Then apply the policy, with fallback to reuse if necessary
 273                  */
 274                 if (cnf->reuse_gids)
 275                         gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 276                 else {
 277                         gid = (gid_t) (bm_lastset(&bm) + 1);
 278                         if (!bm_isset(&bm, gid))
 279                                 gid += cnf->min_gid;
 280                         else
 281                                 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 282                 }
 283
 284                 /*
 285                  * Another sanity check
 286                  */
 287                 if (gid < cnf->min_gid || gid > cnf->max_gid)
 288                         cmderr(EX_SOFTWARE, "unable to allocate a new gid - range fully used\n");
 289                 bm_dealloc(&bm);
 290         }
 291         return gid;
 292 }
 293
 294
 295 static int
 296 print_group(struct group * grp, int pretty)
 297 {
 298         if (!pretty) {
 299                 char            buf[_UC_MAXLINE];
 300
 301                 fmtgrent(buf, grp);
 302                 fputs(buf, stdout);
 303         } else {
 304                 int             i;
 305
 306                 printf("Group Name : %-10s   #%lu\n"
 307                        "   Members : ",
 308                        grp->gr_name, (long) grp->gr_gid);
 309                 for (i = 0; i < _UC_MAXGROUPS && grp->gr_mem[i]; i++)
 310                         printf("%s%s", i ? "," : "", grp->gr_mem[i]);
 311                 fputs("\n\n", stdout);
 312         }
 313         return EXIT_SUCCESS;
 314 }