lib/pam_module/pam_ftpusers/pam_ftpusers.c

   1 /*-
   2  * Copyright (c) 2001 Networks Associates Technology, Inc.
   3  * All rights reserved.
   4  *
   5  * This software was developed for the FreeBSD Project by ThinkSec AS and
   6  * NAI Labs, the Security Research Division of Network Associates, Inc.
   7  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
   8  * DARPA CHATS research program.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. The name of the author may not be used to endorse or promote
  19  *    products derived from this software without specific prior written
  20  *    permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $FreeBSD: src/lib/libpam/modules/pam_ftpusers/pam_ftpusers.c,v 1.1 2002/05/08 00:30:10 des Exp $
  35  */
  36
  37 #include <ctype.h>
  38 #include <grp.h>
  39 #include <paths.h>
  40 #include <pwd.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44
  45 #define PAM_SM_ACCOUNT
  46
  47 #include <security/pam_appl.h>
  48 #include <security/pam_modules.h>
  49 #include <security/pam_mod_misc.h>
  50 #include <security/openpam.h>
  51
  52 PAM_EXTERN int
  53 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
  54                  int argc __unused, const char *argv[] __unused)
  55 {
  56         struct passwd *pwd;
  57         struct group *grp;
  58         const char *user;
  59         int pam_err, found, allow;
  60         char *line, *name, **mem;
  61         size_t len, ulen;
  62         FILE *f;
  63
  64         pam_err = pam_get_user(pamh, &user, NULL);
  65         if (pam_err != PAM_SUCCESS)
  66                 return (pam_err);
  67         if (user == NULL || (pwd = getpwnam(user)) == NULL)
  68                 return (PAM_SERVICE_ERR);
  69
  70         found = 0;
  71         ulen = strlen(user);
  72         if ((f = fopen(_PATH_FTPUSERS, "r")) == NULL) {
  73                 PAM_LOG("%s: %m", _PATH_FTPUSERS);
  74                 goto done;
  75         }
  76         while (!found && (line = fgetln(f, &len)) != NULL) {
  77                 if (*line == '#')
  78                         continue;
  79                 while (len > 0 && isspace(line[len - 1]))
  80                         --len;
  81                 if (len == 0)
  82                         continue;
  83                 /* simple case first */
  84                 if (*line != '@') {
  85                         if (len == ulen && strncmp(user, line, len) == 0)
  86                                 found = 1;
  87                         continue;
  88                 }
  89                 /* member of specified group? */
  90                 asprintf(&name, "%.*s", (int)len - 1, line + 1);
  91                 if (name == NULL) {
  92                         fclose(f);
  93                         return (PAM_BUF_ERR);
  94                 }
  95                 grp = getgrnam(name);
  96                 free(name);
  97                 if (grp == NULL)
  98                         continue;
  99                 for (mem = grp->gr_mem; mem && *mem && !found; ++mem)
 100                         if (strcmp(user, *mem) == 0)
 101                                 found = 1;
 102         }
 103  done:
 104         allow = (openpam_get_option(pamh, "disallow") == NULL);
 105         if (found)
 106                 pam_err = allow ? PAM_SUCCESS : PAM_AUTH_ERR;
 107         else
 108                 pam_err = allow ? PAM_AUTH_ERR : PAM_SUCCESS;
 109         if (f != NULL)
 110                 fclose(f);
 111         return (pam_err);
 112 }
 113
 114 PAM_MODULE_ENTRY("pam_ftpusers");