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/*
* This file implements the following functions:
* pam_modutil_search_key:
* lookup a value for key in login.defs file or similar key value format
*/
#include "pam_private.h"
#include "pam_modutil_private.h"
#include <security/pam_ext.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#ifdef USE_ECONF
#include "pam_econf.h"
#endif
#ifdef USE_ECONF
#define LOGIN_DEFS "/etc/login.defs"
#ifndef VENDORDIR
#define VENDORDIR NULL
#endif
static char *
econf_search_key (const char *name, const char *suffix, const char *key)
{
econf_file *key_file = NULL;
char *val;
econf_err error;
error = pam_econf_readconfig (&key_file, VENDORDIR, SYSCONFDIR, name, suffix,
" \t", "#", NULL, NULL);
if (error != ECONF_SUCCESS) {
econf_free (key_file);
return NULL;
}
if (econf_getStringValue (key_file, NULL, key, &val)) {
econf_free (key_file);
return NULL;
}
econf_free (key_file);
return val;
}
#endif
/* lookup a value for key in login.defs file or similar key value format */
char *
pam_modutil_search_key(pam_handle_t *pamh UNUSED,
const char *file_name,
const char *key)
{
FILE *fp;
char *buf = NULL;
size_t buflen = 0;
char *retval = NULL;
#ifdef USE_ECONF
if (strcmp (file_name, LOGIN_DEFS) == 0)
return econf_search_key ("login", ".defs", key);
#endif
fp = fopen(file_name, "r");
if (NULL == fp)
return NULL;
while (!feof(fp)) {
char *tmp, *cp;
ssize_t n = getline(&buf, &buflen, fp);
cp = buf;
if (n < 1)
break;
if (cp[n - 1] == '\n')
cp[n - 1] = '\0';
tmp = strchr(cp, '#'); /* remove comments */
if (tmp)
*tmp = '\0';
while (isspace((unsigned char)*cp)) /* remove spaces and tabs */
++cp;
if (*cp == '\0') /* ignore empty lines */
continue;
tmp = strsep (&cp, " \t=");
if (cp != NULL)
while (isspace((unsigned char)*cp) || *cp == '=')
++cp;
else
cp = buf + n; /* empty string */
if (strcasecmp(tmp, key) == 0) {
retval = strdup(cp);
break;
}
}
fclose(fp);
free(buf);
return retval;
}
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