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/*
* Copyright (c) 2022 Iker Pedrosa <ipedrosa@redhat.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, and the entire permission notice in its entirety,
* including the disclaimer of warranties.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* ALTERNATIVELY, this product may be distributed under the terms of
* the GNU Public License, in which case the provisions of the GPL are
* required INSTEAD OF the above restrictions. (This clause is
* necessary due to a potential bad interaction between the 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 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <sys/stat.h>
#include <security/pam_modutil.h>
#include "pam_inline.h"
#include "pwhistory_config.h"
#define PWHISTORY_DEFAULT_CONF SCONFIGDIR "/pwhistory.conf"
#ifdef VENDOR_SCONFIGDIR
#define VENDOR_PWHISTORY_DEFAULT_CONF (VENDOR_SCONFIGDIR "/pwhistory.conf")
#endif
void
parse_config_file(pam_handle_t *pamh, int argc, const char **argv,
struct options_t *options)
{
const char *fname = NULL;
int i;
char *val;
for (i = 0; i < argc; ++i) {
const char *str = pam_str_skip_prefix(argv[i], "conf=");
if (str != NULL) {
fname = str;
}
}
if (fname == NULL) {
fname = PWHISTORY_DEFAULT_CONF;
#ifdef VENDOR_PWHISTORY_DEFAULT_CONF
/*
* Check whether PWHISTORY_DEFAULT_CONF file is available.
* If it does not exist, fall back to VENDOR_PWHISTORY_DEFAULT_CONF file.
*/
struct stat buffer;
if (stat(fname, &buffer) != 0 && errno == ENOENT) {
fname = VENDOR_PWHISTORY_DEFAULT_CONF;
}
#endif
}
val = pam_modutil_search_key (pamh, fname, "debug");
if (val != NULL) {
options->debug = 1;
free(val);
}
val = pam_modutil_search_key (pamh, fname, "enforce_for_root");
if (val != NULL) {
options->enforce_for_root = 1;
free(val);
}
val = pam_modutil_search_key (pamh, fname, "remember");
if (val != NULL) {
unsigned int temp;
if (sscanf(val, "%u", &temp) != 1) {
pam_syslog(pamh, LOG_ERR,
"Bad number supplied for remember argument");
} else {
options->remember = temp;
}
free(val);
}
val = pam_modutil_search_key (pamh, fname, "retry");
if (val != NULL) {
unsigned int temp;
if (sscanf(val, "%u", &temp) != 1) {
pam_syslog(pamh, LOG_ERR,
"Bad number supplied for retry argument");
} else {
options->tries = temp;
}
free(val);
}
val = pam_modutil_search_key (pamh, fname, "file");
if (val != NULL) {
if (*val != '/') {
pam_syslog (pamh, LOG_ERR,
"File path should be absolute: %s", val);
} else {
options->filename = val;
}
}
}
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