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/* pam_faildelay module */
/*
* Allows an admin to set the delay on failure per-application.
* Provides "auth" interface only.
*
* Use by putting something like this in the relevant pam config:
* auth required pam_faildelay.so delay=[microseconds]
*
* eg:
* auth required pam_faildelay.so delay=10000000
* will set the delay on failure to 10 seconds.
*
* If no delay option was given, pam_faildelay.so will use the
* FAIL_DELAY value of /etc/login.defs.
*
* Based on pam_rootok and parts of pam_unix both by Andrew Morgan
* <morgan@linux.kernel.org>
*
* Copyright (c) 2006 Thorsten Kukuk <kukuk@thkukuk.de>
* - Rewrite to use extended PAM functions
* - Add /etc/login.defs support
*
* Portions Copyright (c) 2005 Darren Tucker <dtucker at zip com au>.
*
* Redistribution and use in source and binary forms of, with
* or without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain any existing copyright
* notice, and this entire permission notice in its entirety,
* including the disclaimer of warranties.
*
* 2. Redistributions in binary form must reproduce all prior and current
* copyright notices, this list of conditions, and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* 3. The name of any author may not be used to endorse or promote
* products derived from this software without their specific prior
* written permission.
*
* ALTERNATIVELY, this product may be distributed under the terms of the
* GNU General Public License, in which case the provisions of the GNU
* GPL are required INSTEAD OF the above restrictions. (This clause is
* necessary due to a potential conflict between the GNU GPL and the
* restrictions contained in a BSD-style copyright.)
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
#include "config.h"
#include <errno.h>
#include <ctype.h>
#include <stdio.h>
#include <limits.h>
#include <unistd.h>
#include <syslog.h>
#include <string.h>
#include <stdlib.h>
#define PAM_SM_AUTH
#include <security/pam_modules.h>
#include <security/pam_ext.h>
#define BUF_SIZE 8192
#define LOGIN_DEFS "/etc/login.defs"
static char *
search_key (const char *filename)
{
FILE *fp;
char *buf = NULL;
size_t buflen = 0;
char *retval = NULL;
fp = fopen (filename, "r");
if (NULL == fp)
return NULL;
while (!feof (fp))
{
char *tmp, *cp;
#if defined(HAVE_GETLINE)
ssize_t n = getline (&buf, &buflen, fp);
#elif defined (HAVE_GETDELIM)
ssize_t n = getdelim (&buf, &buflen, '\n', fp);
#else
ssize_t n;
if (buf == NULL)
{
buflen = BUF_SIZE;
buf = malloc (buflen);
}
buf[0] = '\0';
if (fgets (buf, buflen - 1, fp) == NULL)
break;
else if (buf != NULL)
n = strlen (buf);
else
n = 0;
#endif /* HAVE_GETLINE / HAVE_GETDELIM */
cp = buf;
if (n < 1)
break;
tmp = strchr (cp, '#'); /* remove comments */
if (tmp)
*tmp = '\0';
while (isspace ((int)*cp)) /* remove spaces and tabs */
++cp;
if (*cp == '\0') /* ignore empty lines */
continue;
if (cp[strlen (cp) - 1] == '\n')
cp[strlen (cp) - 1] = '\0';
tmp = strsep (&cp, " \t=");
if (cp != NULL)
while (isspace ((int)*cp) || *cp == '=')
++cp;
if (strcasecmp (tmp, "FAIL_DELAY") == 0)
{
retval = strdup (cp);
break;
}
}
fclose (fp);
free (buf);
return retval;
}
/* --- authentication management functions (only) --- */
int pam_sm_authenticate(pam_handle_t *pamh, int flags UNUSED,
int argc, const char **argv)
{
int i, debug_flag = 0;
long int delay = -1;
/* step through arguments */
for (i = 0; i < argc; i++) {
if (sscanf(argv[i], "delay=%ld", &delay) == 1) {
/* sscanf did already everything necessary */
} else if (strcmp (argv[i], "debug") == 0)
debug_flag = 1;
else
pam_syslog (pamh, LOG_ERR, "unknown option; %s", argv[i]);
}
if (delay == -1)
{
char *endptr;
char *val = search_key (LOGIN_DEFS);
const char *val_orig = val;
if (val == NULL)
return PAM_IGNORE;
errno = 0;
delay = strtol (val, &endptr, 10) & 0777;
if (((delay == 0) && (val_orig == endptr)) ||
((delay == LONG_MIN || delay == LONG_MAX) && (errno == ERANGE)))
{
pam_syslog (pamh, LOG_ERR, "FAIL_DELAY=%s in %s not valid",
val, LOGIN_DEFS);
free (val);
return PAM_IGNORE;
}
free (val);
/* delay is in seconds, convert to microseconds. */
delay *= 1000000;
}
if (debug_flag)
pam_syslog (pamh, LOG_DEBUG, "setting fail delay to %ld", delay);
i = pam_fail_delay(pamh, delay);
if (i == PAM_SUCCESS)
return PAM_IGNORE;
else
return i;
}
int pam_sm_setcred(pam_handle_t *pamh UNUSED, int flags UNUSED,
int argc UNUSED, const char **argv UNUSED)
{
return PAM_IGNORE;
}
/* end of module definition */
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