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-rw-r--r--modules/pam_faildelay/pam_faildelay.c212
1 files changed, 212 insertions, 0 deletions
diff --git a/modules/pam_faildelay/pam_faildelay.c b/modules/pam_faildelay/pam_faildelay.c
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index 0000000..7ea8f83
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+++ b/modules/pam_faildelay/pam_faildelay.c
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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 */