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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* Cherokee
*
* Authors:
* Alvaro Lopez Ortega <alvaro@alobbs.com>
*
* Copyright (C) 2001-2011 Alvaro Lopez Ortega
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include "common-internal.h"
#include "handler_secdownload.h"
#include "connection-protected.h"
#include "util.h"
#define ENTRIES "handler,secdownload"
ret_t
cherokee_handler_secdownload_props_free (cherokee_handler_secdownload_props_t *props)
{
if (props->props_file != NULL) {
cherokee_handler_file_props_free (props->props_file);
props->props_file = NULL;
}
cherokee_buffer_mrproper (&props->secret);
return cherokee_handler_props_free_base (HANDLER_PROPS(props));
}
ret_t
cherokee_handler_secdownload_configure (cherokee_config_node_t *conf,
cherokee_server_t *srv,
cherokee_module_props_t **_props)
{
ret_t ret;
cherokee_handler_secdownload_props_t *props;
if (*_props == NULL) {
CHEROKEE_NEW_STRUCT (n, handler_secdownload_props);
cherokee_handler_props_init_base (HANDLER_PROPS(n),
MODULE_PROPS_FREE(cherokee_handler_secdownload_props_free));
cherokee_buffer_init (&n->secret);
n->timeout = 60;
*_props = MODULE_PROPS(n);
}
props = PROP_SECDOWN(*_props);
/* Parse 'file' parameters
*/
props->props_file = NULL;
ret = cherokee_handler_file_configure (conf, srv, (cherokee_module_props_t **)&props->props_file);
if ((ret != ret_ok) && (ret != ret_deny))
return ret;
/* Properties
*/
ret = cherokee_config_node_copy (conf, "secret", &props->secret);
if (ret != ret_ok) {
LOG_CRITICAL_S (CHEROKEE_ERROR_HANDLER_SECDOWN_SECRET);
return ret_error;
}
cherokee_config_node_read_int (conf, "timeout", (int*)&props->timeout);
return ret_ok;
}
static int
check_hex (char *p, int len)
{
int i;
for (i=0; i < len; i++) {
if (!((p[i] >= '0' && p[i] <= '9') ||
(p[i] >= 'a' && p[i] <= 'f') ||
(p[i] >= 'A' && p[i] <= 'F')))
{
return 1;
}
}
return 0;
}
static int
get_time (char *p)
{
int i;
time_t time = 0;
for (i=0; i<8; i++) {
time = (time << 4) + hex2dec_tab[(int)p[i]];
}
return time;
}
ret_t
cherokee_handler_secdownload_new (cherokee_handler_t **hdl,
void *cnt,
cherokee_module_props_t *props)
{
int re;
ret_t ret;
char *p;
cuint_t path_len;
time_t time_url;
char *time_s;
cherokee_buffer_t md5 = CHEROKEE_BUF_INIT;
cherokee_connection_t *conn = CONN(cnt);
TRACE(ENTRIES, "Analyzing request '%s'\n", conn->request.buf);
/* Sanity check
*/
if (conn->request.len <= 1 + 32 + 2) {
TRACE(ENTRIES, "Malformed URL. Too short: len=%d.\n", conn->request.len);
conn->error_code = http_not_found;
return ret_error;
}
if (conn->request.buf[0] != '/') {
TRACE(ENTRIES, "Malformed URL: %s\n", "Not slash (1)");
conn->error_code = http_not_found;
return ret_error;
}
p = conn->request.buf + 1;
if (check_hex (p, 32)) {
TRACE(ENTRIES, "Malformed URL: %s\n", "No MD5");
conn->error_code = http_not_found;
return ret_error;
}
p += 32;
if (*p != '/') {
TRACE(ENTRIES, "Malformed URL: %s\n", "Not slash (2)");
conn->error_code = http_not_found;
return ret_error;
}
p += 1;
time_s = p;
if (check_hex (p, 8)) {
TRACE(ENTRIES, "Malformed URL: %s\n", "No MD5 (2)");
conn->error_code = http_not_found;
return ret_error;
}
p += 8;
/* Check the time
*/
time_url = get_time (time_s);
if ((cherokee_bogonow_now - time_url) > (int)PROP_SECDOWN(props)->timeout) {
TRACE(ENTRIES, "Time out: %d (now=%d)\n", time_url, cherokee_bogonow_now);
conn->error_code = http_gone;
return ret_error;
}
/* Check the MD5
* [secret][path][hex(time)]
*/
path_len = (conn->request.buf + conn->request.len) - p;
cherokee_buffer_add_buffer (&md5, &PROP_SECDOWN(props)->secret);
cherokee_buffer_add (&md5, p, path_len);
cherokee_buffer_add (&md5, time_s, 8);
cherokee_buffer_encode_md5_digest (&md5);
re = strncasecmp (md5.buf, &conn->request.buf[1], 32);
if (re != 0) {
#ifdef TRACE_ENABLED
if (cherokee_trace_is_tracing()) {
cherokee_buffer_t tmp = CHEROKEE_BUF_INIT;
cherokee_buffer_add_str (&tmp, "secret='");
cherokee_buffer_add_buffer (&tmp, &PROP_SECDOWN(props)->secret);
cherokee_buffer_add_str (&tmp, "', path='");
cherokee_buffer_add (&tmp, p, path_len);
cherokee_buffer_add_str (&tmp, "', time='");
cherokee_buffer_add (&tmp, time_s, 8);
cherokee_buffer_add_str (&tmp, "'");
TRACE(ENTRIES, "MD5 (%s) didn't match (%s)\n", md5.buf, tmp.buf);
cherokee_buffer_mrproper(&tmp);
}
#endif
cherokee_buffer_mrproper(&md5);
conn->error_code = http_access_denied;
return ret_error;
}
cherokee_buffer_mrproper (&md5);
/* At this point the request has been validated
*/
if (cherokee_buffer_is_empty (&conn->request_original)) {
cherokee_buffer_add_buffer (&conn->request_original, &conn->request);
cherokee_buffer_add_buffer (&conn->query_string_original, &conn->query_string);
}
cherokee_buffer_clean (&conn->request);
cherokee_buffer_add (&conn->request, p, path_len);
/* Instance the File handler
*/
ret = cherokee_handler_file_new (hdl, cnt, MODULE_PROPS(PROP_SECDOWN(props)->props_file));
if (ret != ret_ok)
return ret_ok;
return ret_ok;
}
/* Library init function
*/
static cherokee_boolean_t _secdownload_is_init = false;
void
PLUGIN_INIT_NAME(secdownload) (cherokee_plugin_loader_t *loader)
{
if (_secdownload_is_init) return;
_secdownload_is_init = true;
/* Load the dependences
*/
cherokee_plugin_loader_load (loader, "file");
}
PLUGIN_INFO_HANDLER_EASY_INIT (secdownload, http_all_methods);
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