lib/libpam/modules/pam_ftpusers/pam_ftpusers.c

   1 /*      $NetBSD: pam_ftpusers.c,v 1.4 2005/04/19 03:15:34 christos Exp $        */
   2
   3 /*-
   4  * Copyright (c) 2001 Networks Associates Technology, Inc.
   5  * All rights reserved.
   6  *
   7  * This software was developed for the FreeBSD Project by ThinkSec AS and
   8  * NAI Labs, the Security Research Division of Network Associates, Inc.
   9  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
  10  * DARPA CHATS research program.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. The name of the author may not be used to endorse or promote
  21  *    products derived from this software without specific prior written
  22  *    permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #include <sys/cdefs.h>
  38 #ifdef __FreeBSD__
  39 __FBSDID("$FreeBSD: src/lib/libpam/modules/pam_ftpusers/pam_ftpusers.c,v 1.1 2002/05/08 00:30:10 des Exp $");
  40 #else
  41 __RCSID("$NetBSD: pam_ftpusers.c,v 1.4 2005/04/19 03:15:34 christos Exp $");
  42 #endif
  43
  44 #include <ctype.h>
  45 #include <grp.h>
  46 #include <paths.h>
  47 #include <pwd.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51
  52 #define PAM_SM_ACCOUNT
  53
  54 #include <security/pam_appl.h>
  55 #include <security/pam_modules.h>
  56 #include <security/pam_mod_misc.h>
  57 #include <security/openpam.h>
  58
  59 PAM_EXTERN int
  60 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
  61     int argc __unused, const char *argv[] __unused)
  62 {
  63         struct passwd *pwd, pwres;
  64         struct group *grp, grres;
  65         const char *user;
  66         int pam_err, found, allow;
  67         char *line, *name, **mem;
  68         size_t len, ulen;
  69         FILE *f;
  70         char pwbuf[1024], grbuf[1024];
  71
  72         pam_err = pam_get_user(pamh, &user, NULL);
  73         if (pam_err != PAM_SUCCESS)
  74                 return (pam_err);
  75         if (user == NULL ||
  76             getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
  77             pwd == NULL)
  78                 return (PAM_SERVICE_ERR);
  79
  80         found = 0;
  81         ulen = strlen(user);
  82         if ((f = fopen(_PATH_FTPUSERS, "r")) == NULL) {
  83                 PAM_LOG("%s: %m", _PATH_FTPUSERS);
  84                 goto done;
  85         }
  86         while (!found && (line = fgetln(f, &len)) != NULL) {
  87                 if (*line == '#')
  88                         continue;
  89                 while (len > 0 && isspace((unsigned char)line[len - 1]))
  90                         --len;
  91                 if (len == 0)
  92                         continue;
  93                 /* simple case first */
  94                 if (*line != '@') {
  95                         if (len == ulen && strncmp(user, line, len) == 0)
  96                                 found = 1;
  97                         continue;
  98                 }
  99                 /* member of specified group? */
 100                 asprintf(&name, "%.*s", (int)len - 1, line + 1);
 101                 if (name == NULL) {
 102                         fclose(f);
 103                         return (PAM_BUF_ERR);
 104                 }
 105                 (void)getgrnam_r(name, &grres, grbuf, sizeof(grbuf), &grp);
 106                 free(name);
 107                 if (grp == NULL)
 108                         continue;
 109                 for (mem = grp->gr_mem; mem && *mem && !found; ++mem)
 110                         if (strcmp(user, *mem) == 0)
 111                                 found = 1;
 112         }
 113  done:
 114         allow = (openpam_get_option(pamh, "disallow") == NULL);
 115         if (found)
 116                 pam_err = allow ? PAM_SUCCESS : PAM_AUTH_ERR;
 117         else
 118                 pam_err = allow ? PAM_AUTH_ERR : PAM_SUCCESS;
 119         if (f != NULL)
 120                 fclose(f);
 121         return (pam_err);
 122 }
 123
 124 PAM_MODULE_ENTRY("pam_ftpusers");