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interceptdb.c
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/**
* ratched - TLS connection router that performs a man-in-the-middle attack
* Copyright (C) 2017-2017 Johannes Bauer
*
* This file is part of ratched.
*
* ratched is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; this program is ONLY licensed under
* version 3 of the License, later versions are explicitly excluded.
*
* ratched 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 ratched; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Johannes Bauer <[email protected]>
**/
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdint.h>
#include "interceptdb.h"
#include "pgmopts.h"
#include "intercept_config.h"
#include "certforgery.h"
#include "map.h"
static struct intercept_entry_t default_entry;
static struct map_t *intercept_entry_by_hostname;
struct intercept_entry_t* interceptdb_find_entry(const char *hostname, uint32_t ipv4_nbo) {
struct intercept_entry_t *entry = (struct intercept_entry_t*)strmap_get(intercept_entry_by_hostname, hostname);
if (!entry) {
return &default_entry;
} else {
return entry;
}
}
static void initialize_default_intercept_entry(struct intercept_entry_t *new_entry) {
new_entry->interception_mode = OPPORTUNISTIC_TLS_INTERCEPTION;
new_entry->server_template.ocsp_status = true;
new_entry->client_template.ocsp_status = true;
new_entry->server_template.tls_versions = TLS_VERSION_TLS10 | TLS_VERSION_TLS11 | TLS_VERSION_TLS12 | TLS_VERSION_TLS13;
new_entry->client_template.tls_versions = TLS_VERSION_TLS10 | TLS_VERSION_TLS11 | TLS_VERSION_TLS12 | TLS_VERSION_TLS13;
}
static bool init_tls_intercept_entry(struct tls_endpoint_config_t *config, const struct intercept_side_config_t *side_config, const char *description) {
struct tls_endpoint_cert_source_t certsrc = {
.cert_filename = side_config->cert_filename,
.key_filename = side_config->key_filename,
.chain_filename = side_config->chain_filename,
.certificate_authority = {
.cert_filename = side_config->ca_cert_filename,
.key_filename = side_config->ca_key_filename,
},
};
if (!init_tls_endpoint_config(config, description, &certsrc)) {
return false;
}
if (config->certificate_authority.cert && config->certificate_authority.key) {
/* Use CA server and key as OCSP responder */
config->ocsp_responder.cert = config->certificate_authority.cert;
config->ocsp_responder.key = config->certificate_authority.key;
X509_up_ref(config->ocsp_responder.cert);
EVP_PKEY_up_ref(config->ocsp_responder.key);
}
config->request_cert_from_peer = side_config->request_client_cert;
config->ocsp_status = side_config->ocsp_status;
config->include_root_ca_cert = side_config->include_root_ca_cert;
if (side_config->tls_versions != TLS_VERSION_UNDEFINED) {
config->tls_versions = side_config->tls_versions;
}
config->ciphersuites = side_config->ciphersuites;
config->supported_groups = side_config->supported_groups;
config->signature_algorithms = side_config->signature_algorithms;
return true;
}
static bool initialize_intercept_entry_from_pgm_config(struct intercept_entry_t *new_entry, const struct intercept_config_t *pgm_config) {
memset(new_entry, 0, sizeof(struct intercept_entry_t));
initialize_default_intercept_entry(new_entry);
if (pgm_config) {
if (pgm_config->interception_mode != INTERCEPTION_MODE_UNDEFINED) {
new_entry->interception_mode = pgm_config->interception_mode;
}
new_entry->hostname = pgm_config->hostname;
new_entry->ipv4_nbo = pgm_config->ipv4_nbo;
char text[128];
snprintf(text, sizeof(text), "%s client", pgm_config->hostname);
if (!init_tls_intercept_entry(&new_entry->client_template, &pgm_config->client, text)) {
return false;
}
snprintf(text, sizeof(text), "%s server", pgm_config->hostname);
if (!init_tls_intercept_entry(&new_entry->server_template, &pgm_config->server, text)) {
return false;
}
}
/* Defaults that apply even when options are specified -- for example, if
* only client cert is specified, the internal server cert should still be
* used instead of throwing an error that it hasn't been specified. */
if (!new_entry->server_template.key) {
new_entry->server_template.key = get_tls_server_key();
}
if (!new_entry->server_template.certificate_authority.key && !new_entry->server_template.certificate_authority.cert) {
new_entry->server_template.certificate_authority.cert = get_forged_root_certificate();
new_entry->server_template.certificate_authority.key = get_forged_root_key();
}
if (!new_entry->server_template.ocsp_responder.key && !new_entry->server_template.ocsp_responder.cert) {
new_entry->server_template.ocsp_responder.cert = get_forged_root_certificate();
new_entry->server_template.ocsp_responder.key = get_forged_root_key();
}
return true;
}
bool init_interceptdb(void) {
if (!initialize_intercept_entry_from_pgm_config(&default_entry, pgm_options->default_config)) {
return false;
}
intercept_entry_by_hostname = map_new();
for (int i = 0; i < pgm_options->custom_configs->element_count; i++) {
struct intercept_config_t *pgm_config = (struct intercept_config_t *)pgm_options->custom_configs->elements[i]->value.pointer;
struct map_element_t *new_map_entry = strmap_set_mem(intercept_entry_by_hostname, pgm_config->hostname, NULL, sizeof(struct intercept_entry_t));
if (!new_map_entry) {
return false;
}
struct intercept_entry_t *new_entry = (struct intercept_entry_t*)new_map_entry->value.pointer;
initialize_intercept_entry_from_pgm_config(new_entry, pgm_config);
}
return true;
}
static void free_entry(void *vintercept_entry) {
struct intercept_entry_t *intercept_entry = (struct intercept_entry_t*)vintercept_entry;
free_tls_endpoint_config(&intercept_entry->client_template);
free_tls_endpoint_config(&intercept_entry->server_template);
}
void deinit_interceptdb(void) {
free_entry(&default_entry);
map_foreach_ptrvalue(intercept_entry_by_hostname, free_entry);
map_free(intercept_entry_by_hostname);
}