dist/openpam/lib/openpam_set_option.c

   1 /*-
   2  * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
   3  * Copyright (c) 2004-2007 Dag-Erling Smørgrav
   4  * All rights reserved.
   5  *
   6  * This software was developed for the FreeBSD Project by ThinkSec AS and
   7  * Network Associates Laboratories, the Security Research Division of
   8  * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
   9  * ("CBOSS"), as part of the DARPA CHATS research program.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. The name of the author may not be used to endorse or promote
  20  *    products derived from this software without specific prior written
  21  *    permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  * $Id: openpam_set_option.c,v 1.3 2008/01/27 01:22:59 christos Exp $
  36  */
  37
  38 #include <sys/param.h>
  39
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43
  44 #include <security/pam_appl.h>
  45 #include <security/openpam.h>
  46
  47 #include "openpam_impl.h"
  48
  49 /*
  50  * OpenPAM extension
  51  *
  52  * Sets the value of a module option
  53  */
  54
  55 int
  56 openpam_set_option(pam_handle_t *pamh,
  57         const char *option,
  58         const char *value)
  59 {
  60         pam_chain_t *cur;
  61         char *opt, **optv;
  62         size_t len;
  63         int i;
  64
  65         ENTERS(option);
  66         if (pamh == NULL || pamh->current == NULL || option == NULL)
  67                 RETURNC(PAM_SYSTEM_ERR);
  68         cur = pamh->current;
  69         for (len = 0; option[len] != '\0'; ++len)
  70                 if (option[len] == '=')
  71                         break;
  72         for (i = 0; i < cur->optc; ++i) {
  73                 if (strncmp(cur->optv[i], option, len) == 0 &&
  74                     (cur->optv[i][len] == '\0' || cur->optv[i][len] == '='))
  75                         break;
  76         }
  77         if (value == NULL) {
  78                 /* remove */
  79                 if (i == cur->optc)
  80                         RETURNC(PAM_SUCCESS);
  81                 for (free(cur->optv[i]); i < cur->optc; ++i)
  82                         cur->optv[i] = cur->optv[i + 1];
  83                 cur->optv[i] = NULL;
  84                 RETURNC(PAM_SUCCESS);
  85         }
  86         if (asprintf(&opt, "%.*s=%s", (int)len, option, value) < 0)
  87                 RETURNC(PAM_BUF_ERR);
  88         if (i == cur->optc) {
  89                 /* add */
  90                 optv = realloc(cur->optv, sizeof(char *) * (cur->optc + 2));
  91                 if (optv == NULL) {
  92                         FREE(opt);
  93                         RETURNC(PAM_BUF_ERR);
  94                 }
  95                 optv[i] = opt;
  96                 optv[i + 1] = NULL;
  97                 cur->optv = optv;
  98                 ++cur->optc;
  99         } else {
 100                 /* replace */
 101                 FREE(cur->optv[i]);
 102                 cur->optv[i] = opt;
 103         }
 104         RETURNC(PAM_SUCCESS);
 105         /*NOTREACHED*/
 106 }
 107
 108 /*
 109  * Error codes:
 110  *
 111  *      PAM_SYSTEM_ERR
 112  *      PAM_BUF_ERR
 113  */
 114
 115 /**
 116  * The =openpam_set_option function sets the specified option in the
 117  * context of the currently executing service module.
 118  *
 119  * >openpam_get_option
 120  */