1198 lines
30 KiB
C
1198 lines
30 KiB
C
/*
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* Copyright (C) 2010 Martin Willi
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* Copyright (C) 2010 revosec AG
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "tls_peer.h"
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#include <utils/debug.h>
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#include <credentials/certificates/x509.h>
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#include <time.h>
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typedef struct private_tls_peer_t private_tls_peer_t;
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typedef enum {
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STATE_INIT,
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STATE_HELLO_SENT,
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STATE_HELLO_RECEIVED,
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STATE_HELLO_DONE,
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STATE_CERT_SENT,
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STATE_CERT_RECEIVED,
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STATE_KEY_EXCHANGE_RECEIVED,
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STATE_CERTREQ_RECEIVED,
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STATE_KEY_EXCHANGE_SENT,
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STATE_VERIFY_SENT,
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STATE_CIPHERSPEC_CHANGED_OUT,
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STATE_FINISHED_SENT,
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STATE_CIPHERSPEC_CHANGED_IN,
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STATE_FINISHED_RECEIVED,
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} peer_state_t;
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/**
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* Private data of an tls_peer_t object.
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*/
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struct private_tls_peer_t {
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/**
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* Public tls_peer_t interface.
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*/
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tls_peer_t public;
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/**
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* TLS stack
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*/
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tls_t *tls;
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/**
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* TLS crypto context
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*/
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tls_crypto_t *crypto;
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/**
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* TLS alert handler
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*/
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tls_alert_t *alert;
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/**
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* Peer identity, NULL for no client authentication
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*/
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identification_t *peer;
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/**
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* Server identity
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*/
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identification_t *server;
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/**
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* State we are in
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*/
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peer_state_t state;
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/**
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* Hello random data selected by client
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*/
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char client_random[32];
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/**
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* Hello random data selected by server
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*/
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char server_random[32];
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/**
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* Auth helper for peer authentication
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*/
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auth_cfg_t *peer_auth;
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/**
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* Auth helper for server authentication
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*/
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auth_cfg_t *server_auth;
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/**
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* Peer private key
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*/
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private_key_t *private;
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/**
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* DHE exchange
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*/
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diffie_hellman_t *dh;
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/**
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* Resuming a session?
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*/
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bool resume;
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/**
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* TLS session identifier
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*/
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chunk_t session;
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/**
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* List of server-supported hashsig algorithms
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*/
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chunk_t hashsig;
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/**
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* List of server-supported client certificate types
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*/
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chunk_t cert_types;
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};
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/**
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* Process a server hello message
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*/
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static status_t process_server_hello(private_tls_peer_t *this,
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bio_reader_t *reader)
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{
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u_int8_t compression;
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u_int16_t version, cipher;
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chunk_t random, session, ext = chunk_empty;
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tls_cipher_suite_t suite = 0;
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this->crypto->append_handshake(this->crypto,
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TLS_SERVER_HELLO, reader->peek(reader));
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if (!reader->read_uint16(reader, &version) ||
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!reader->read_data(reader, sizeof(this->server_random), &random) ||
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!reader->read_data8(reader, &session) ||
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!reader->read_uint16(reader, &cipher) ||
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!reader->read_uint8(reader, &compression) ||
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(reader->remaining(reader) && !reader->read_data16(reader, &ext)))
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{
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DBG1(DBG_TLS, "received invalid ServerHello");
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this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
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return NEED_MORE;
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}
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memcpy(this->server_random, random.ptr, sizeof(this->server_random));
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if (!this->tls->set_version(this->tls, version))
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{
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DBG1(DBG_TLS, "negotiated version %N not supported",
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tls_version_names, version);
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this->alert->add(this->alert, TLS_FATAL, TLS_PROTOCOL_VERSION);
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return NEED_MORE;
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}
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if (chunk_equals(this->session, session))
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{
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suite = this->crypto->resume_session(this->crypto, session, this->server,
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chunk_from_thing(this->client_random),
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chunk_from_thing(this->server_random));
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if (suite)
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{
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DBG1(DBG_TLS, "resumed %N using suite %N",
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tls_version_names, version, tls_cipher_suite_names, suite);
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this->resume = TRUE;
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}
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}
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if (!suite)
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{
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suite = cipher;
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if (!this->crypto->select_cipher_suite(this->crypto, &suite, 1, KEY_ANY))
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{
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DBG1(DBG_TLS, "received TLS cipher suite %N inacceptable",
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tls_cipher_suite_names, suite);
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this->alert->add(this->alert, TLS_FATAL, TLS_HANDSHAKE_FAILURE);
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return NEED_MORE;
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}
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DBG1(DBG_TLS, "negotiated %N using suite %N",
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tls_version_names, version, tls_cipher_suite_names, suite);
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free(this->session.ptr);
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this->session = chunk_clone(session);
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}
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this->state = STATE_HELLO_RECEIVED;
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return NEED_MORE;
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}
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/**
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* Check if a server certificate is acceptable for the given server identity
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*/
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static bool check_certificate(private_tls_peer_t *this, certificate_t *cert)
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{
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identification_t *id;
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if (cert->has_subject(cert, this->server))
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{
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return TRUE;
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}
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id = cert->get_subject(cert);
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if (id->matches(id, this->server))
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{
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return TRUE;
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}
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if (cert->get_type(cert) == CERT_X509)
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{
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x509_t *x509 = (x509_t*)cert;
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enumerator_t *enumerator;
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enumerator = x509->create_subjectAltName_enumerator(x509);
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while (enumerator->enumerate(enumerator, &id))
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{
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if (id->matches(id, this->server))
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{
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enumerator->destroy(enumerator);
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return TRUE;
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}
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}
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enumerator->destroy(enumerator);
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}
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DBG1(DBG_TLS, "server certificate does not match to '%Y'", this->server);
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return FALSE;
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}
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/**
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* Process a Certificate message
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*/
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static status_t process_certificate(private_tls_peer_t *this,
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bio_reader_t *reader)
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{
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certificate_t *cert;
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bio_reader_t *certs;
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chunk_t data;
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bool first = TRUE;
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this->crypto->append_handshake(this->crypto,
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TLS_CERTIFICATE, reader->peek(reader));
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if (!reader->read_data24(reader, &data))
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{
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DBG1(DBG_TLS, "certificate message header invalid");
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this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
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return NEED_MORE;
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}
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certs = bio_reader_create(data);
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while (certs->remaining(certs))
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{
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if (!certs->read_data24(certs, &data))
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{
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DBG1(DBG_TLS, "certificate message invalid");
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this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
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certs->destroy(certs);
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return NEED_MORE;
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}
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cert = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
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BUILD_BLOB_ASN1_DER, data, BUILD_END);
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if (cert)
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{
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if (first)
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{
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if (!check_certificate(this, cert))
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{
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cert->destroy(cert);
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certs->destroy(certs);
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this->alert->add(this->alert, TLS_FATAL, TLS_ACCESS_DENIED);
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return NEED_MORE;
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}
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this->server_auth->add(this->server_auth,
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AUTH_HELPER_SUBJECT_CERT, cert);
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DBG1(DBG_TLS, "received TLS server certificate '%Y'",
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cert->get_subject(cert));
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first = FALSE;
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}
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else
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{
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DBG1(DBG_TLS, "received TLS intermediate certificate '%Y'",
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cert->get_subject(cert));
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this->server_auth->add(this->server_auth,
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AUTH_HELPER_IM_CERT, cert);
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}
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}
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else
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{
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DBG1(DBG_TLS, "parsing TLS certificate failed, skipped");
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this->alert->add(this->alert, TLS_WARNING, TLS_BAD_CERTIFICATE);
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}
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}
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certs->destroy(certs);
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this->state = STATE_CERT_RECEIVED;
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return NEED_MORE;
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}
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/**
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* Find a trusted public key to encrypt/verify key exchange data
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*/
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static public_key_t *find_public_key(private_tls_peer_t *this)
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{
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public_key_t *public = NULL, *current;
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certificate_t *cert;
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enumerator_t *enumerator;
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auth_cfg_t *auth;
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cert = this->server_auth->get(this->server_auth, AUTH_HELPER_SUBJECT_CERT);
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if (cert)
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{
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enumerator = lib->credmgr->create_public_enumerator(lib->credmgr,
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KEY_ANY, cert->get_subject(cert), this->server_auth);
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while (enumerator->enumerate(enumerator, ¤t, &auth))
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{
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public = current->get_ref(current);
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break;
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}
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enumerator->destroy(enumerator);
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}
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return public;
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}
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/**
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* Process a Key Exchange message using MODP Diffie Hellman
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*/
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static status_t process_modp_key_exchange(private_tls_peer_t *this,
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bio_reader_t *reader)
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{
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chunk_t prime, generator, pub, chunk;
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public_key_t *public;
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chunk = reader->peek(reader);
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if (!reader->read_data16(reader, &prime) ||
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!reader->read_data16(reader, &generator) ||
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!reader->read_data16(reader, &pub))
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{
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DBG1(DBG_TLS, "received invalid Server Key Exchange");
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this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
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return NEED_MORE;
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}
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public = find_public_key(this);
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if (!public)
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{
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DBG1(DBG_TLS, "no TLS public key found for server '%Y'", this->server);
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this->alert->add(this->alert, TLS_FATAL, TLS_CERTIFICATE_UNKNOWN);
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return NEED_MORE;
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}
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chunk.len = 2 + prime.len + 2 + generator.len + 2 + pub.len;
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chunk = chunk_cat("ccc", chunk_from_thing(this->client_random),
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chunk_from_thing(this->server_random), chunk);
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if (!this->crypto->verify(this->crypto, public, reader, chunk))
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{
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public->destroy(public);
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free(chunk.ptr);
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DBG1(DBG_TLS, "verifying DH parameters failed");
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this->alert->add(this->alert, TLS_FATAL, TLS_BAD_CERTIFICATE);
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return NEED_MORE;
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}
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public->destroy(public);
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free(chunk.ptr);
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this->dh = lib->crypto->create_dh(lib->crypto, MODP_CUSTOM,
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generator, prime);
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if (!this->dh)
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{
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DBG1(DBG_TLS, "custom DH parameters not supported");
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this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
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return NEED_MORE;
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}
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this->dh->set_other_public_value(this->dh, pub);
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this->state = STATE_KEY_EXCHANGE_RECEIVED;
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return NEED_MORE;
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}
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/**
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* Get the EC group for a TLS named curve
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*/
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static diffie_hellman_group_t curve_to_ec_group(private_tls_peer_t *this,
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tls_named_curve_t curve)
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{
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diffie_hellman_group_t group;
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tls_named_curve_t current;
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enumerator_t *enumerator;
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enumerator = this->crypto->create_ec_enumerator(this->crypto);
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while (enumerator->enumerate(enumerator, &group, ¤t))
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{
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if (current == curve)
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{
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enumerator->destroy(enumerator);
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return group;
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}
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}
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enumerator->destroy(enumerator);
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return 0;
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}
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/**
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* Process a Key Exchange message using EC Diffie Hellman
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*/
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static status_t process_ec_key_exchange(private_tls_peer_t *this,
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bio_reader_t *reader)
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{
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diffie_hellman_group_t group;
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public_key_t *public;
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u_int8_t type;
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u_int16_t curve;
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chunk_t pub, chunk;
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chunk = reader->peek(reader);
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if (!reader->read_uint8(reader, &type))
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{
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DBG1(DBG_TLS, "received invalid Server Key Exchange");
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this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
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return NEED_MORE;
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}
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if (type != TLS_ECC_NAMED_CURVE)
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{
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DBG1(DBG_TLS, "ECDH curve type %N not supported",
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tls_ecc_curve_type_names, type);
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this->alert->add(this->alert, TLS_FATAL, TLS_HANDSHAKE_FAILURE);
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return NEED_MORE;
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}
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if (!reader->read_uint16(reader, &curve) ||
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!reader->read_data8(reader, &pub) || pub.len == 0)
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{
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DBG1(DBG_TLS, "received invalid Server Key Exchange");
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this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
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return NEED_MORE;
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}
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group = curve_to_ec_group(this, curve);
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if (!group)
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{
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DBG1(DBG_TLS, "ECDH curve %N not supported",
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tls_named_curve_names, curve);
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this->alert->add(this->alert, TLS_FATAL, TLS_HANDSHAKE_FAILURE);
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return NEED_MORE;
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}
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public = find_public_key(this);
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if (!public)
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{
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DBG1(DBG_TLS, "no TLS public key found for server '%Y'", this->server);
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this->alert->add(this->alert, TLS_FATAL, TLS_CERTIFICATE_UNKNOWN);
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return NEED_MORE;
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}
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chunk.len = 4 + pub.len;
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chunk = chunk_cat("ccc", chunk_from_thing(this->client_random),
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chunk_from_thing(this->server_random), chunk);
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if (!this->crypto->verify(this->crypto, public, reader, chunk))
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{
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public->destroy(public);
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free(chunk.ptr);
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DBG1(DBG_TLS, "verifying DH parameters failed");
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this->alert->add(this->alert, TLS_FATAL, TLS_BAD_CERTIFICATE);
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return NEED_MORE;
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}
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public->destroy(public);
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free(chunk.ptr);
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this->dh = lib->crypto->create_dh(lib->crypto, group);
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if (!this->dh)
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{
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DBG1(DBG_TLS, "DH group %N not supported",
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diffie_hellman_group_names, group);
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this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
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return NEED_MORE;
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}
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if (pub.ptr[0] != TLS_ANSI_UNCOMPRESSED)
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{
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DBG1(DBG_TLS, "DH point format '%N' not supported",
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tls_ansi_point_format_names, pub.ptr[0]);
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this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
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return NEED_MORE;
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}
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this->dh->set_other_public_value(this->dh, chunk_skip(pub, 1));
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this->state = STATE_KEY_EXCHANGE_RECEIVED;
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return NEED_MORE;
|
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}
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|
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/**
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* Process a Server Key Exchange
|
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*/
|
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static status_t process_key_exchange(private_tls_peer_t *this,
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bio_reader_t *reader)
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{
|
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diffie_hellman_group_t group;
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|
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this->crypto->append_handshake(this->crypto,
|
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TLS_SERVER_KEY_EXCHANGE, reader->peek(reader));
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|
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group = this->crypto->get_dh_group(this->crypto);
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if (group == MODP_NONE)
|
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{
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DBG1(DBG_TLS, "received Server Key Exchange, but not required "
|
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"for current suite");
|
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this->alert->add(this->alert, TLS_FATAL, TLS_HANDSHAKE_FAILURE);
|
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return NEED_MORE;
|
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}
|
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if (diffie_hellman_group_is_ec(group))
|
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{
|
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return process_ec_key_exchange(this, reader);
|
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}
|
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return process_modp_key_exchange(this, reader);
|
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}
|
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|
|
/**
|
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* Process a Certificate Request message
|
|
*/
|
|
static status_t process_certreq(private_tls_peer_t *this, bio_reader_t *reader)
|
|
{
|
|
chunk_t types, hashsig, data;
|
|
bio_reader_t *authorities;
|
|
identification_t *id;
|
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certificate_t *cert;
|
|
|
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if (!this->peer)
|
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{
|
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DBG1(DBG_TLS, "server requested a certificate, but client "
|
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"authentication disabled");
|
|
}
|
|
this->crypto->append_handshake(this->crypto,
|
|
TLS_CERTIFICATE_REQUEST, reader->peek(reader));
|
|
|
|
if (!reader->read_data8(reader, &types))
|
|
{
|
|
DBG1(DBG_TLS, "certreq message header invalid");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
this->cert_types = chunk_clone(types);
|
|
if (this->tls->get_version(this->tls) >= TLS_1_2)
|
|
{
|
|
if (!reader->read_data16(reader, &hashsig))
|
|
{
|
|
DBG1(DBG_TLS, "certreq message invalid");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
this->hashsig = chunk_clone(hashsig);
|
|
}
|
|
if (!reader->read_data16(reader, &data))
|
|
{
|
|
DBG1(DBG_TLS, "certreq message invalid");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
authorities = bio_reader_create(data);
|
|
while (authorities->remaining(authorities))
|
|
{
|
|
if (!authorities->read_data16(authorities, &data))
|
|
{
|
|
DBG1(DBG_TLS, "certreq message invalid");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
|
|
authorities->destroy(authorities);
|
|
return NEED_MORE;
|
|
}
|
|
if (this->peer)
|
|
{
|
|
id = identification_create_from_encoding(ID_DER_ASN1_DN, data);
|
|
cert = lib->credmgr->get_cert(lib->credmgr,
|
|
CERT_X509, KEY_ANY, id, TRUE);
|
|
if (cert)
|
|
{
|
|
DBG1(DBG_TLS, "received TLS cert request for '%Y", id);
|
|
this->peer_auth->add(this->peer_auth, AUTH_RULE_CA_CERT, cert);
|
|
}
|
|
else
|
|
{
|
|
DBG1(DBG_TLS, "received TLS cert request for unknown CA '%Y'", id);
|
|
}
|
|
id->destroy(id);
|
|
}
|
|
}
|
|
authorities->destroy(authorities);
|
|
this->state = STATE_CERTREQ_RECEIVED;
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Process Hello Done message
|
|
*/
|
|
static status_t process_hello_done(private_tls_peer_t *this,
|
|
bio_reader_t *reader)
|
|
{
|
|
this->crypto->append_handshake(this->crypto,
|
|
TLS_SERVER_HELLO_DONE, reader->peek(reader));
|
|
this->state = STATE_HELLO_DONE;
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Process finished message
|
|
*/
|
|
static status_t process_finished(private_tls_peer_t *this, bio_reader_t *reader)
|
|
{
|
|
chunk_t received;
|
|
char buf[12];
|
|
|
|
if (!reader->read_data(reader, sizeof(buf), &received))
|
|
{
|
|
DBG1(DBG_TLS, "received server finished too short");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
if (!this->crypto->calculate_finished(this->crypto, "server finished", buf))
|
|
{
|
|
DBG1(DBG_TLS, "calculating server finished failed");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
if (!chunk_equals(received, chunk_from_thing(buf)))
|
|
{
|
|
DBG1(DBG_TLS, "received server finished invalid");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_DECRYPT_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
this->state = STATE_FINISHED_RECEIVED;
|
|
this->crypto->append_handshake(this->crypto, TLS_FINISHED, received);
|
|
|
|
return NEED_MORE;
|
|
}
|
|
|
|
METHOD(tls_handshake_t, process, status_t,
|
|
private_tls_peer_t *this, tls_handshake_type_t type, bio_reader_t *reader)
|
|
{
|
|
tls_handshake_type_t expected;
|
|
|
|
switch (this->state)
|
|
{
|
|
case STATE_HELLO_SENT:
|
|
if (type == TLS_SERVER_HELLO)
|
|
{
|
|
return process_server_hello(this, reader);
|
|
}
|
|
expected = TLS_SERVER_HELLO;
|
|
break;
|
|
case STATE_HELLO_RECEIVED:
|
|
if (type == TLS_CERTIFICATE)
|
|
{
|
|
return process_certificate(this, reader);
|
|
}
|
|
expected = TLS_CERTIFICATE;
|
|
break;
|
|
case STATE_CERT_RECEIVED:
|
|
if (type == TLS_SERVER_KEY_EXCHANGE)
|
|
{
|
|
return process_key_exchange(this, reader);
|
|
}
|
|
/* fall through since TLS_SERVER_KEY_EXCHANGE is optional */
|
|
case STATE_KEY_EXCHANGE_RECEIVED:
|
|
if (type == TLS_CERTIFICATE_REQUEST)
|
|
{
|
|
return process_certreq(this, reader);
|
|
}
|
|
/* no cert request, server does not want to authenticate us */
|
|
DESTROY_IF(this->peer);
|
|
this->peer = NULL;
|
|
/* fall through since TLS_CERTIFICATE_REQUEST is optional */
|
|
case STATE_CERTREQ_RECEIVED:
|
|
if (type == TLS_SERVER_HELLO_DONE)
|
|
{
|
|
return process_hello_done(this, reader);
|
|
}
|
|
expected = TLS_SERVER_HELLO_DONE;
|
|
break;
|
|
case STATE_CIPHERSPEC_CHANGED_IN:
|
|
if (type == TLS_FINISHED)
|
|
{
|
|
return process_finished(this, reader);
|
|
}
|
|
expected = TLS_FINISHED;
|
|
break;
|
|
default:
|
|
DBG1(DBG_TLS, "TLS %N not expected in current state",
|
|
tls_handshake_type_names, type);
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_UNEXPECTED_MESSAGE);
|
|
return NEED_MORE;
|
|
}
|
|
DBG1(DBG_TLS, "TLS %N expected, but received %N",
|
|
tls_handshake_type_names, expected, tls_handshake_type_names, type);
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_UNEXPECTED_MESSAGE);
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Send a client hello
|
|
*/
|
|
static status_t send_client_hello(private_tls_peer_t *this,
|
|
tls_handshake_type_t *type, bio_writer_t *writer)
|
|
{
|
|
tls_cipher_suite_t *suites;
|
|
bio_writer_t *extensions, *curves = NULL;
|
|
tls_version_t version;
|
|
tls_named_curve_t curve;
|
|
enumerator_t *enumerator;
|
|
int count, i;
|
|
rng_t *rng;
|
|
|
|
htoun32(&this->client_random, time(NULL));
|
|
rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
|
|
if (!rng ||
|
|
!rng->get_bytes(rng, sizeof(this->client_random) - 4,
|
|
this->client_random + 4))
|
|
{
|
|
DBG1(DBG_TLS, "failed to generate client random");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
DESTROY_IF(rng);
|
|
return NEED_MORE;
|
|
}
|
|
rng->destroy(rng);
|
|
|
|
/* TLS version */
|
|
version = this->tls->get_version(this->tls);
|
|
writer->write_uint16(writer, version);
|
|
writer->write_data(writer, chunk_from_thing(this->client_random));
|
|
|
|
/* session identifier */
|
|
this->session = this->crypto->get_session(this->crypto, this->server);
|
|
writer->write_data8(writer, this->session);
|
|
|
|
/* add TLS cipher suites */
|
|
count = this->crypto->get_cipher_suites(this->crypto, &suites);
|
|
writer->write_uint16(writer, count * 2);
|
|
for (i = 0; i < count; i++)
|
|
{
|
|
writer->write_uint16(writer, suites[i]);
|
|
}
|
|
|
|
/* NULL compression only */
|
|
writer->write_uint8(writer, 1);
|
|
writer->write_uint8(writer, 0);
|
|
|
|
extensions = bio_writer_create(32);
|
|
|
|
extensions->write_uint16(extensions, TLS_EXT_SIGNATURE_ALGORITHMS);
|
|
this->crypto->get_signature_algorithms(this->crypto, extensions);
|
|
|
|
/* add supported Elliptic Curves, if any */
|
|
enumerator = this->crypto->create_ec_enumerator(this->crypto);
|
|
while (enumerator->enumerate(enumerator, NULL, &curve))
|
|
{
|
|
if (!curves)
|
|
{
|
|
extensions->write_uint16(extensions, TLS_EXT_ELLIPTIC_CURVES);
|
|
curves = bio_writer_create(16);
|
|
}
|
|
curves->write_uint16(curves, curve);
|
|
}
|
|
enumerator->destroy(enumerator);
|
|
if (curves)
|
|
{
|
|
curves->wrap16(curves);
|
|
extensions->write_data16(extensions, curves->get_buf(curves));
|
|
curves->destroy(curves);
|
|
|
|
/* if we support curves, add point format extension */
|
|
extensions->write_uint16(extensions, TLS_EXT_EC_POINT_FORMATS);
|
|
extensions->write_uint16(extensions, 2);
|
|
extensions->write_uint8(extensions, 1);
|
|
extensions->write_uint8(extensions, TLS_EC_POINT_UNCOMPRESSED);
|
|
}
|
|
if (this->server->get_type(this->server) == ID_FQDN)
|
|
{
|
|
bio_writer_t *names;
|
|
|
|
DBG2(DBG_TLS, "sending Server Name Indication for '%Y'", this->server);
|
|
|
|
names = bio_writer_create(8);
|
|
names->write_uint8(names, TLS_NAME_TYPE_HOST_NAME);
|
|
names->write_data16(names, this->server->get_encoding(this->server));
|
|
names->wrap16(names);
|
|
extensions->write_uint16(extensions, TLS_EXT_SERVER_NAME);
|
|
extensions->write_data16(extensions, names->get_buf(names));
|
|
names->destroy(names);
|
|
}
|
|
|
|
writer->write_data16(writer, extensions->get_buf(extensions));
|
|
extensions->destroy(extensions);
|
|
|
|
*type = TLS_CLIENT_HELLO;
|
|
this->state = STATE_HELLO_SENT;
|
|
this->crypto->append_handshake(this->crypto, *type, writer->get_buf(writer));
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Find a private key suitable to sign Certificate Verify
|
|
*/
|
|
static private_key_t *find_private_key(private_tls_peer_t *this)
|
|
{
|
|
private_key_t *key = NULL;
|
|
bio_reader_t *reader;
|
|
key_type_t type;
|
|
u_int8_t cert;
|
|
|
|
if (!this->peer)
|
|
{
|
|
return NULL;
|
|
}
|
|
reader = bio_reader_create(this->cert_types);
|
|
while (reader->remaining(reader) && reader->read_uint8(reader, &cert))
|
|
{
|
|
switch (cert)
|
|
{
|
|
case TLS_RSA_SIGN:
|
|
type = KEY_RSA;
|
|
break;
|
|
case TLS_ECDSA_SIGN:
|
|
type = KEY_ECDSA;
|
|
break;
|
|
default:
|
|
continue;
|
|
}
|
|
key = lib->credmgr->get_private(lib->credmgr, type,
|
|
this->peer, this->peer_auth);
|
|
if (key)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
reader->destroy(reader);
|
|
return key;
|
|
}
|
|
|
|
/**
|
|
* Send Certificate
|
|
*/
|
|
static status_t send_certificate(private_tls_peer_t *this,
|
|
tls_handshake_type_t *type, bio_writer_t *writer)
|
|
{
|
|
enumerator_t *enumerator;
|
|
certificate_t *cert;
|
|
auth_rule_t rule;
|
|
bio_writer_t *certs;
|
|
chunk_t data;
|
|
|
|
this->private = find_private_key(this);
|
|
if (!this->private)
|
|
{
|
|
DBG1(DBG_TLS, "no TLS peer certificate found for '%Y', "
|
|
"skipping client authentication", this->peer);
|
|
this->peer->destroy(this->peer);
|
|
this->peer = NULL;
|
|
}
|
|
|
|
/* generate certificate payload */
|
|
certs = bio_writer_create(256);
|
|
if (this->peer)
|
|
{
|
|
cert = this->peer_auth->get(this->peer_auth, AUTH_RULE_SUBJECT_CERT);
|
|
if (cert)
|
|
{
|
|
if (cert->get_encoding(cert, CERT_ASN1_DER, &data))
|
|
{
|
|
DBG1(DBG_TLS, "sending TLS peer certificate '%Y'",
|
|
cert->get_subject(cert));
|
|
certs->write_data24(certs, data);
|
|
free(data.ptr);
|
|
}
|
|
}
|
|
enumerator = this->peer_auth->create_enumerator(this->peer_auth);
|
|
while (enumerator->enumerate(enumerator, &rule, &cert))
|
|
{
|
|
if (rule == AUTH_RULE_IM_CERT)
|
|
{
|
|
if (cert->get_encoding(cert, CERT_ASN1_DER, &data))
|
|
{
|
|
DBG1(DBG_TLS, "sending TLS intermediate certificate '%Y'",
|
|
cert->get_subject(cert));
|
|
certs->write_data24(certs, data);
|
|
free(data.ptr);
|
|
}
|
|
}
|
|
}
|
|
enumerator->destroy(enumerator);
|
|
}
|
|
|
|
writer->write_data24(writer, certs->get_buf(certs));
|
|
certs->destroy(certs);
|
|
|
|
*type = TLS_CERTIFICATE;
|
|
this->state = STATE_CERT_SENT;
|
|
this->crypto->append_handshake(this->crypto, *type, writer->get_buf(writer));
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Send client key exchange, using premaster encryption
|
|
*/
|
|
static status_t send_key_exchange_encrypt(private_tls_peer_t *this,
|
|
tls_handshake_type_t *type, bio_writer_t *writer)
|
|
{
|
|
public_key_t *public;
|
|
rng_t *rng;
|
|
char premaster[48];
|
|
chunk_t encrypted;
|
|
|
|
rng = lib->crypto->create_rng(lib->crypto, RNG_STRONG);
|
|
if (!rng || !rng->get_bytes(rng, sizeof(premaster) - 2, premaster + 2))
|
|
{
|
|
DBG1(DBG_TLS, "failed to generate TLS premaster secret");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
DESTROY_IF(rng);
|
|
return NEED_MORE;
|
|
}
|
|
rng->destroy(rng);
|
|
htoun16(premaster, TLS_1_2);
|
|
|
|
if (!this->crypto->derive_secrets(this->crypto, chunk_from_thing(premaster),
|
|
this->session, this->server,
|
|
chunk_from_thing(this->client_random),
|
|
chunk_from_thing(this->server_random)))
|
|
{
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
|
|
public = find_public_key(this);
|
|
if (!public)
|
|
{
|
|
DBG1(DBG_TLS, "no TLS public key found for server '%Y'", this->server);
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_CERTIFICATE_UNKNOWN);
|
|
return NEED_MORE;
|
|
}
|
|
if (!public->encrypt(public, ENCRYPT_RSA_PKCS1,
|
|
chunk_from_thing(premaster), &encrypted))
|
|
{
|
|
public->destroy(public);
|
|
DBG1(DBG_TLS, "encrypting TLS premaster secret failed");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_BAD_CERTIFICATE);
|
|
return NEED_MORE;
|
|
}
|
|
public->destroy(public);
|
|
|
|
writer->write_data16(writer, encrypted);
|
|
free(encrypted.ptr);
|
|
|
|
*type = TLS_CLIENT_KEY_EXCHANGE;
|
|
this->state = STATE_KEY_EXCHANGE_SENT;
|
|
this->crypto->append_handshake(this->crypto, *type, writer->get_buf(writer));
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Send client key exchange, using DHE exchange
|
|
*/
|
|
static status_t send_key_exchange_dhe(private_tls_peer_t *this,
|
|
tls_handshake_type_t *type, bio_writer_t *writer)
|
|
{
|
|
chunk_t premaster, pub;
|
|
|
|
if (this->dh->get_shared_secret(this->dh, &premaster) != SUCCESS)
|
|
{
|
|
DBG1(DBG_TLS, "calculating premaster from DH failed");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
if (!this->crypto->derive_secrets(this->crypto, premaster,
|
|
this->session, this->server,
|
|
chunk_from_thing(this->client_random),
|
|
chunk_from_thing(this->server_random)))
|
|
{
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
chunk_clear(&premaster);
|
|
return NEED_MORE;
|
|
}
|
|
chunk_clear(&premaster);
|
|
|
|
this->dh->get_my_public_value(this->dh, &pub);
|
|
if (this->dh->get_dh_group(this->dh) == MODP_CUSTOM)
|
|
{
|
|
writer->write_data16(writer, pub);
|
|
}
|
|
else
|
|
{ /* ECP uses 8bit length header only, but a point format */
|
|
writer->write_uint8(writer, pub.len + 1);
|
|
writer->write_uint8(writer, TLS_ANSI_UNCOMPRESSED);
|
|
writer->write_data(writer, pub);
|
|
}
|
|
free(pub.ptr);
|
|
|
|
*type = TLS_CLIENT_KEY_EXCHANGE;
|
|
this->state = STATE_KEY_EXCHANGE_SENT;
|
|
this->crypto->append_handshake(this->crypto, *type, writer->get_buf(writer));
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Send client key exchange, depending on suite
|
|
*/
|
|
static status_t send_key_exchange(private_tls_peer_t *this,
|
|
tls_handshake_type_t *type, bio_writer_t *writer)
|
|
{
|
|
if (this->dh)
|
|
{
|
|
return send_key_exchange_dhe(this, type, writer);
|
|
}
|
|
return send_key_exchange_encrypt(this, type, writer);
|
|
}
|
|
|
|
/**
|
|
* Send certificate verify
|
|
*/
|
|
static status_t send_certificate_verify(private_tls_peer_t *this,
|
|
tls_handshake_type_t *type, bio_writer_t *writer)
|
|
{
|
|
if (!this->private ||
|
|
!this->crypto->sign_handshake(this->crypto, this->private,
|
|
writer, this->hashsig))
|
|
{
|
|
DBG1(DBG_TLS, "creating TLS Certificate Verify signature failed");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
|
|
*type = TLS_CERTIFICATE_VERIFY;
|
|
this->state = STATE_VERIFY_SENT;
|
|
this->crypto->append_handshake(this->crypto, *type, writer->get_buf(writer));
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Send Finished
|
|
*/
|
|
static status_t send_finished(private_tls_peer_t *this,
|
|
tls_handshake_type_t *type, bio_writer_t *writer)
|
|
{
|
|
char buf[12];
|
|
|
|
if (!this->crypto->calculate_finished(this->crypto, "client finished", buf))
|
|
{
|
|
DBG1(DBG_TLS, "calculating client finished data failed");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
|
|
writer->write_data(writer, chunk_from_thing(buf));
|
|
|
|
*type = TLS_FINISHED;
|
|
this->state = STATE_FINISHED_SENT;
|
|
this->crypto->append_handshake(this->crypto, *type, writer->get_buf(writer));
|
|
return NEED_MORE;
|
|
}
|
|
|
|
METHOD(tls_handshake_t, build, status_t,
|
|
private_tls_peer_t *this, tls_handshake_type_t *type, bio_writer_t *writer)
|
|
{
|
|
switch (this->state)
|
|
{
|
|
case STATE_INIT:
|
|
return send_client_hello(this, type, writer);
|
|
case STATE_HELLO_DONE:
|
|
if (this->peer)
|
|
{
|
|
return send_certificate(this, type, writer);
|
|
}
|
|
/* otherwise fall through to next state */
|
|
case STATE_CERT_SENT:
|
|
return send_key_exchange(this, type, writer);
|
|
case STATE_KEY_EXCHANGE_SENT:
|
|
if (this->peer)
|
|
{
|
|
return send_certificate_verify(this, type, writer);
|
|
}
|
|
else
|
|
{
|
|
return INVALID_STATE;
|
|
}
|
|
case STATE_CIPHERSPEC_CHANGED_OUT:
|
|
return send_finished(this, type, writer);
|
|
default:
|
|
return INVALID_STATE;
|
|
}
|
|
}
|
|
|
|
METHOD(tls_handshake_t, cipherspec_changed, bool,
|
|
private_tls_peer_t *this, bool inbound)
|
|
{
|
|
if (inbound)
|
|
{
|
|
if (this->resume)
|
|
{
|
|
return this->state == STATE_HELLO_RECEIVED;
|
|
}
|
|
return this->state == STATE_FINISHED_SENT;
|
|
}
|
|
else
|
|
{
|
|
if (this->resume)
|
|
{
|
|
return this->state == STATE_FINISHED_RECEIVED;
|
|
}
|
|
if (this->peer)
|
|
{
|
|
return this->state == STATE_VERIFY_SENT;
|
|
}
|
|
return this->state == STATE_KEY_EXCHANGE_SENT;
|
|
}
|
|
}
|
|
|
|
METHOD(tls_handshake_t, change_cipherspec, void,
|
|
private_tls_peer_t *this, bool inbound)
|
|
{
|
|
this->crypto->change_cipher(this->crypto, inbound);
|
|
if (inbound)
|
|
{
|
|
this->state = STATE_CIPHERSPEC_CHANGED_IN;
|
|
}
|
|
else
|
|
{
|
|
this->state = STATE_CIPHERSPEC_CHANGED_OUT;
|
|
}
|
|
}
|
|
|
|
METHOD(tls_handshake_t, finished, bool,
|
|
private_tls_peer_t *this)
|
|
{
|
|
if (this->resume)
|
|
{
|
|
return this->state == STATE_FINISHED_SENT;
|
|
}
|
|
return this->state == STATE_FINISHED_RECEIVED;
|
|
}
|
|
|
|
METHOD(tls_handshake_t, get_peer_id, identification_t*,
|
|
private_tls_peer_t *this)
|
|
{
|
|
return this->peer;
|
|
}
|
|
|
|
METHOD(tls_handshake_t, get_server_id, identification_t*,
|
|
private_tls_peer_t *this)
|
|
{
|
|
return this->server;
|
|
}
|
|
|
|
METHOD(tls_handshake_t, destroy, void,
|
|
private_tls_peer_t *this)
|
|
{
|
|
DESTROY_IF(this->private);
|
|
DESTROY_IF(this->dh);
|
|
DESTROY_IF(this->peer);
|
|
this->server->destroy(this->server);
|
|
this->peer_auth->destroy(this->peer_auth);
|
|
this->server_auth->destroy(this->server_auth);
|
|
free(this->hashsig.ptr);
|
|
free(this->cert_types.ptr);
|
|
free(this->session.ptr);
|
|
free(this);
|
|
}
|
|
|
|
/**
|
|
* See header
|
|
*/
|
|
tls_peer_t *tls_peer_create(tls_t *tls, tls_crypto_t *crypto, tls_alert_t *alert,
|
|
identification_t *peer, identification_t *server)
|
|
{
|
|
private_tls_peer_t *this;
|
|
|
|
INIT(this,
|
|
.public = {
|
|
.handshake = {
|
|
.process = _process,
|
|
.build = _build,
|
|
.cipherspec_changed = _cipherspec_changed,
|
|
.change_cipherspec = _change_cipherspec,
|
|
.finished = _finished,
|
|
.get_peer_id = _get_peer_id,
|
|
.get_server_id = _get_server_id,
|
|
.destroy = _destroy,
|
|
},
|
|
},
|
|
.state = STATE_INIT,
|
|
.tls = tls,
|
|
.crypto = crypto,
|
|
.alert = alert,
|
|
.peer = peer ? peer->clone(peer) : NULL,
|
|
.server = server->clone(server),
|
|
.peer_auth = auth_cfg_create(),
|
|
.server_auth = auth_cfg_create(),
|
|
);
|
|
|
|
return &this->public;
|
|
}
|