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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 "config.h"
#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 <libeconf.h>
#endif
#define BUF_SIZE 8192
#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;
if (econf_readDirs (&key_file, VENDORDIR, SYSCONFDIR, name, suffix,
" \t", "#"))
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;
#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);
if (buf == NULL) {
fclose(fp);
return NULL;
}
}
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;
if (cp[n - 1] == '\n')
cp[n - 1] = '\0';
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;
tmp = strsep (&cp, " \t=");
if (cp != NULL)
while (isspace((int)*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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