1794 lines
45 KiB
C
1794 lines
45 KiB
C
/*
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* Copyright (C) 2020 Pascal Knecht
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* HSR Hochschule fuer Technik Rapperswil
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*
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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_server.h"
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#include <time.h>
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#include <utils/debug.h>
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#include <credentials/certificates/x509.h>
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#include <collections/array.h>
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typedef struct private_tls_server_t private_tls_server_t;
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/**
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* Size of a session ID
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*/
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#define SESSION_ID_SIZE 16
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typedef enum {
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STATE_INIT,
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STATE_HELLO_RECEIVED,
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STATE_HELLO_SENT,
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STATE_CERT_SENT,
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STATE_KEY_EXCHANGE_SENT,
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STATE_CERTREQ_SENT,
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STATE_HELLO_DONE,
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STATE_CERT_RECEIVED,
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STATE_KEY_EXCHANGE_RECEIVED,
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STATE_CERT_VERIFY_RECEIVED,
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STATE_CIPHERSPEC_CHANGED_IN,
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STATE_FINISHED_RECEIVED,
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STATE_CIPHERSPEC_CHANGED_OUT,
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STATE_FINISHED_SENT,
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/* new states in TLS 1.3 */
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STATE_ENCRYPTED_EXTENSIONS_SENT,
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STATE_CERT_VERIFY_SENT,
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STATE_KEY_UPDATE_REQUESTED,
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STATE_KEY_UPDATE_SENT,
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} server_state_t;
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/**
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* Private data of an tls_server_t object.
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*/
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struct private_tls_server_t {
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/**
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* Public tls_server_t interface.
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*/
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tls_server_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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* Server identity
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*/
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identification_t *server;
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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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* Is it acceptable if we couldn't verify the peer certificate?
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*/
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bool peer_auth_optional;
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/**
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* State we are in
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*/
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server_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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* Requested DH group
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*/
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tls_named_group_t requested_curve;
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/**
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* Selected TLS cipher suite
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*/
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tls_cipher_suite_t suite;
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/**
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* Offered TLS version of the client
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*/
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tls_version_t client_version;
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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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* Do we resume a session?
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*/
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bool resume;
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/**
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* Hash and signature algorithms supported by peer
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*/
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chunk_t hashsig;
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/**
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* Elliptic curves supported by peer
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*/
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chunk_t curves;
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/**
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* Did we receive the curves from the client?
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*/
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bool curves_received;
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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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public_key_t *tls_find_public_key(auth_cfg_t *peer_auth)
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{
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public_key_t *public = NULL, *current;
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certificate_t *cert, *found;
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enumerator_t *enumerator;
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auth_cfg_t *auth;
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cert = peer_auth->get(peer_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),
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peer_auth, TRUE);
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while (enumerator->enumerate(enumerator, ¤t, &auth))
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{
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found = auth->get(auth, AUTH_RULE_SUBJECT_CERT);
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if (found && cert->equals(cert, found))
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{
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public = current->get_ref(current);
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peer_auth->merge(peer_auth, auth, FALSE);
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break;
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}
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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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* Create an array of an intersection of server and peer supported key types
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*/
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static array_t *create_common_key_types(chunk_t hashsig,
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tls_version_t version_min,
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tls_version_t version_max)
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{
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array_t *key_types;
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enumerator_t *enumerator;
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key_type_t v, lookup;
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uint16_t sig_scheme;
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key_types = array_create(sizeof(key_type_t), 8);
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enumerator = tls_get_supported_key_types(version_min, version_max);
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while (enumerator->enumerate(enumerator, &v))
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{
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bio_reader_t *reader;
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reader = bio_reader_create(hashsig);
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while (reader->remaining(reader) &&
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reader->read_uint16(reader, &sig_scheme))
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{
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lookup = tls_signature_scheme_to_key_type(sig_scheme);
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if (v == lookup)
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{
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array_insert(key_types, ARRAY_TAIL, &lookup);
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break;
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}
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}
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reader->destroy(reader);
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}
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enumerator->destroy(enumerator);
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return key_types;
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}
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/**
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* Find a cipher suite and a server key
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*/
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static bool select_suite_and_key(private_tls_server_t *this,
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tls_cipher_suite_t *suites, int count)
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{
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array_t *key_types;
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tls_version_t version_min, version_max;
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private_key_t *key;
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key_type_t type;
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version_min = this->tls->get_version_min(this->tls);
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version_max = this->tls->get_version_max(this->tls);
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key_types = create_common_key_types(this->hashsig, version_min, version_max);
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if (!array_count(key_types))
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{
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DBG1(DBG_TLS, "no common signature algorithms found");
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array_destroy(key_types);
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return FALSE;
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}
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while (array_remove(key_types, ARRAY_HEAD, &type))
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{
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key = lib->credmgr->get_private(lib->credmgr, type, this->server,
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this->server_auth);
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if (key)
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{
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break;
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}
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}
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if (!key)
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{
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DBG1(DBG_TLS, "no usable TLS server certificate found for '%Y'",
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this->server);
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array_destroy(key_types);
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return FALSE;
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}
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if (version_max >= TLS_1_3)
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{
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this->suite = this->crypto->select_cipher_suite(this->crypto, suites,
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count, KEY_ANY);
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}
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else
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{
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this->suite = this->crypto->select_cipher_suite(this->crypto, suites,
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count, type);
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while (!this->suite && array_remove(key_types, ARRAY_HEAD, &type))
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{ /* find a key and cipher suite for one of the remaining key types */
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DESTROY_IF(key);
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this->server_auth->destroy(this->server_auth);
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this->server_auth = auth_cfg_create();
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key = lib->credmgr->get_private(lib->credmgr, type, this->server,
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this->server_auth);
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if (key)
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{
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this->suite = this->crypto->select_cipher_suite(this->crypto,
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suites, count,
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type);
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}
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}
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}
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array_destroy(key_types);
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if (!this->suite || !key)
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{
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DBG1(DBG_TLS, "received cipher suites or signature schemes unacceptable");
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return FALSE;
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}
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DBG1(DBG_TLS, "using key of type %N", key_type_names, key->get_type(key));
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this->private = key;
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return TRUE;
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}
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/**
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* Check if the peer supports a given TLS curve
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*/
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static bool peer_supports_curve(private_tls_server_t *this,
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tls_named_group_t curve)
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{
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bio_reader_t *reader;
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uint16_t current;
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if (!this->curves_received)
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{ /* none received, assume yes */
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return TRUE;
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}
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reader = bio_reader_create(this->curves);
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while (reader->remaining(reader) && reader->read_uint16(reader, ¤t))
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{
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if (current == curve)
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{
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reader->destroy(reader);
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return TRUE;
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}
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}
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reader->destroy(reader);
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return FALSE;
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}
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/**
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* TLS 1.3 key exchange key share
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*/
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typedef struct {
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uint16_t curve;
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chunk_t key_share;
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} key_share_t;
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/**
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* Check if peer sent a key share of a given TLS named DH group
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*/
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static bool peer_offered_curve(array_t *key_shares, tls_named_group_t curve,
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key_share_t *out)
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{
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key_share_t peer;
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int i;
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for (i = 0; i < array_count(key_shares); i++)
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{
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array_get(key_shares, i, &peer);
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if (curve == peer.curve)
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{
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if (out)
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{
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*out = peer;
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}
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return TRUE;
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}
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}
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return FALSE;
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}
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/**
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* Check if client is currently retrying to connect to the server.
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*/
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static bool retrying(private_tls_server_t *this)
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{
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return this->state == STATE_INIT && this->requested_curve;
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}
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/**
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* Process client hello message
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*/
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static status_t process_client_hello(private_tls_server_t *this,
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bio_reader_t *reader)
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{
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uint16_t legacy_version = 0, version = 0, extension_type = 0;
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chunk_t random, session, ciphers, versions = chunk_empty, compression;
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chunk_t ext = chunk_empty, key_shares = chunk_empty;
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key_share_t peer = {0};
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chunk_t extension_data = chunk_empty;
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bio_reader_t *extensions, *extension;
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tls_cipher_suite_t *suites;
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int count, i;
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rng_t *rng;
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this->crypto->append_handshake(this->crypto,
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TLS_CLIENT_HELLO, reader->peek(reader));
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if (!reader->read_uint16(reader, &legacy_version) ||
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!reader->read_data(reader, sizeof(this->client_random), &random) ||
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!reader->read_data8(reader, &session) ||
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!reader->read_data16(reader, &ciphers) ||
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!reader->read_data8(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 ClientHello");
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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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/* before we do anything version-related, determine our supported suites
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* as that might change the min./max. versions */
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this->crypto->get_cipher_suites(this->crypto, NULL);
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extensions = bio_reader_create(ext);
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while (extensions->remaining(extensions))
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{
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if (!extensions->read_uint16(extensions, &extension_type) ||
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!extensions->read_data16(extensions, &extension_data))
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{
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DBG1(DBG_TLS, "received invalid ClientHello Extensions");
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this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
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extensions->destroy(extensions);
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return NEED_MORE;
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}
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extension = bio_reader_create(extension_data);
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DBG2(DBG_TLS, "received TLS '%N' extension",
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tls_extension_names, extension_type);
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DBG3(DBG_TLS, "%B", &extension_data);
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switch (extension_type)
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{
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case TLS_EXT_SIGNATURE_ALGORITHMS:
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if (!extension->read_data16(extension, &extension_data))
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{
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DBG1(DBG_TLS, "invalid %N extension",
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tls_extension_names, extension_type);
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this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
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extensions->destroy(extensions);
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extension->destroy(extension);
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return NEED_MORE;
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}
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chunk_free(&this->hashsig);
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this->hashsig = chunk_clone(extension_data);
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break;
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case TLS_EXT_SUPPORTED_GROUPS:
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if (!extension->read_data16(extension, &extension_data))
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{
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DBG1(DBG_TLS, "invalid %N extension",
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tls_extension_names, extension_type);
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this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
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extensions->destroy(extensions);
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extension->destroy(extension);
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return NEED_MORE;
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}
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chunk_free(&this->curves);
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this->curves_received = TRUE;
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this->curves = chunk_clone(extension_data);
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break;
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case TLS_EXT_SUPPORTED_VERSIONS:
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if (!extension->read_data8(extension, &versions))
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{
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DBG1(DBG_TLS, "invalid %N extension",
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tls_extension_names, extension_type);
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this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
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extensions->destroy(extensions);
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extension->destroy(extension);
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return NEED_MORE;
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}
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break;
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case TLS_EXT_KEY_SHARE:
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if (!extension->read_data16(extension, &key_shares))
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{
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DBG1(DBG_TLS, "invalid %N extension",
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tls_extension_names, extension_type);
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this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
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extensions->destroy(extensions);
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extension->destroy(extension);
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return NEED_MORE;
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}
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break;
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default:
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break;
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}
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extension->destroy(extension);
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}
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extensions->destroy(extensions);
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if (this->tls->get_version_max(this->tls) >= TLS_1_3 && !this->hashsig.len)
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{
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DBG1(DBG_TLS, "no %N extension received", tls_extension_names,
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TLS_MISSING_EXTENSION);
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this->alert->add(this->alert, TLS_FATAL, TLS_MISSING_EXTENSION);
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return NEED_MORE;
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}
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memcpy(this->client_random, random.ptr, sizeof(this->client_random));
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htoun32(&this->server_random, time(NULL));
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rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
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if (!rng ||
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!rng->get_bytes(rng, sizeof(this->server_random) - 4,
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this->server_random + 4))
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{
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DBG1(DBG_TLS, "failed to generate server random");
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this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
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DESTROY_IF(rng);
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return NEED_MORE;
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}
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rng->destroy(rng);
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|
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if (versions.len)
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{
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bio_reader_t *client_versions;
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client_versions = bio_reader_create(versions);
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while (client_versions->remaining(client_versions))
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{
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if (client_versions->read_uint16(client_versions, &version))
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{
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if (this->tls->set_version(this->tls, version, version))
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{
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this->client_version = version;
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break;
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}
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}
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}
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client_versions->destroy(client_versions);
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}
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else
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{
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version = legacy_version;
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if (this->tls->set_version(this->tls, version, version))
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{
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this->client_version = version;
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}
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}
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if (!this->client_version)
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{
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DBG1(DBG_TLS, "proposed version %N not supported", tls_version_names,
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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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|
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if (this->tls->get_version_max(this->tls) < TLS_1_3)
|
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{
|
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this->suite = this->crypto->resume_session(this->crypto, session,
|
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this->peer,
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chunk_from_thing(this->client_random),
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chunk_from_thing(this->server_random));
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}
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|
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if (this->suite)
|
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{
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this->session = chunk_clone(session);
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this->resume = TRUE;
|
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DBG1(DBG_TLS, "resumed %N using suite %N",
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tls_version_names, this->tls->get_version_max(this->tls),
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tls_cipher_suite_names, this->suite);
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}
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else
|
|
{
|
|
count = ciphers.len / sizeof(uint16_t);
|
|
suites = alloca(count * sizeof(tls_cipher_suite_t));
|
|
DBG2(DBG_TLS, "received %d TLS cipher suites:", count);
|
|
for (i = 0; i < count; i++)
|
|
{
|
|
suites[i] = untoh16(&ciphers.ptr[i * sizeof(uint16_t)]);
|
|
DBG2(DBG_TLS, " %N", tls_cipher_suite_names, suites[i]);
|
|
}
|
|
if (!select_suite_and_key(this, suites, count))
|
|
{
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_HANDSHAKE_FAILURE);
|
|
return NEED_MORE;
|
|
}
|
|
if (this->tls->get_version_max(this->tls) < TLS_1_3)
|
|
{
|
|
rng = lib->crypto->create_rng(lib->crypto, RNG_STRONG);
|
|
if (!rng ||
|
|
!rng->allocate_bytes(rng, SESSION_ID_SIZE, &this->session))
|
|
{
|
|
DBG1(DBG_TLS, "generating TLS session identifier failed, skipped");
|
|
}
|
|
DESTROY_IF(rng);
|
|
}
|
|
else
|
|
{
|
|
this->session = chunk_clone(session);
|
|
}
|
|
DBG1(DBG_TLS, "negotiated %N using suite %N",
|
|
tls_version_names, this->tls->get_version_max(this->tls),
|
|
tls_cipher_suite_names, this->suite);
|
|
}
|
|
|
|
if (this->tls->get_version_max(this->tls) >= TLS_1_3)
|
|
{
|
|
diffie_hellman_group_t group;
|
|
tls_named_group_t curve, requesting_curve = 0;
|
|
enumerator_t *enumerator;
|
|
chunk_t shared_secret = chunk_empty;
|
|
array_t *peer_key_shares;
|
|
|
|
peer_key_shares = array_create(sizeof(key_share_t), 1);
|
|
extension = bio_reader_create(key_shares);
|
|
while (extension->remaining(extension))
|
|
{
|
|
if (!extension->read_uint16(extension, &peer.curve) ||
|
|
!extension->read_data16(extension, &peer.key_share) ||
|
|
!peer.key_share.len)
|
|
{
|
|
DBG1(DBG_TLS, "invalid %N extension",
|
|
tls_extension_names, extension_type);
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
|
|
extension->destroy(extension);
|
|
array_destroy(peer_key_shares);
|
|
return NEED_MORE;
|
|
}
|
|
array_insert(peer_key_shares, ARRAY_TAIL, &peer);
|
|
}
|
|
extension->destroy(extension);
|
|
|
|
enumerator = this->crypto->create_ec_enumerator(this->crypto);
|
|
while (enumerator->enumerate(enumerator, &group, &curve))
|
|
{
|
|
if (!requesting_curve &&
|
|
peer_supports_curve(this, curve) &&
|
|
!peer_offered_curve(peer_key_shares, curve, NULL))
|
|
{
|
|
requesting_curve = curve;
|
|
}
|
|
if (peer_supports_curve(this, curve) &&
|
|
peer_offered_curve(peer_key_shares, curve, &peer))
|
|
{
|
|
DBG1(DBG_TLS, "using key exchange %N",
|
|
tls_named_group_names, curve);
|
|
this->dh = lib->crypto->create_dh(lib->crypto, group);
|
|
break;
|
|
}
|
|
}
|
|
enumerator->destroy(enumerator);
|
|
array_destroy(peer_key_shares);
|
|
|
|
if (!this->dh)
|
|
{
|
|
if (retrying(this))
|
|
{
|
|
DBG1(DBG_TLS, "already replied with a hello retry request");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_UNEXPECTED_MESSAGE);
|
|
return NEED_MORE;
|
|
}
|
|
|
|
if (!requesting_curve)
|
|
{
|
|
DBG1(DBG_TLS, "no mutual supported group in client hello");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_ILLEGAL_PARAMETER);
|
|
return NEED_MORE;
|
|
}
|
|
this->requested_curve = requesting_curve;
|
|
|
|
if (!this->crypto->hash_handshake(this->crypto, NULL))
|
|
{
|
|
DBG1(DBG_TLS, "failed to hash handshake messages");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (peer.key_share.len &&
|
|
peer.curve != TLS_CURVE25519 &&
|
|
peer.curve != TLS_CURVE448)
|
|
{ /* classic format (see RFC 8446, section 4.2.8.2) */
|
|
if (peer.key_share.ptr[0] != TLS_ANSI_UNCOMPRESSED)
|
|
{
|
|
DBG1(DBG_TLS, "DH point format '%N' not supported",
|
|
tls_ansi_point_format_names, peer.key_share.ptr[0]);
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
peer.key_share = chunk_skip(peer.key_share, 1);
|
|
}
|
|
if (!peer.key_share.len ||
|
|
!this->dh->set_other_public_value(this->dh, peer.key_share))
|
|
{
|
|
DBG1(DBG_TLS, "DH key derivation failed");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_HANDSHAKE_FAILURE);
|
|
chunk_clear(&shared_secret);
|
|
return NEED_MORE;
|
|
}
|
|
chunk_clear(&shared_secret);
|
|
this->requested_curve = 0;
|
|
}
|
|
}
|
|
|
|
this->state = STATE_HELLO_RECEIVED;
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Process certificate
|
|
*/
|
|
static status_t process_certificate(private_tls_server_t *this,
|
|
bio_reader_t *reader)
|
|
{
|
|
certificate_t *cert;
|
|
bio_reader_t *certs;
|
|
chunk_t data;
|
|
bool first = TRUE;
|
|
|
|
this->crypto->append_handshake(this->crypto,
|
|
TLS_CERTIFICATE, reader->peek(reader));
|
|
|
|
if (!reader->read_data24(reader, &data))
|
|
{
|
|
DBG1(DBG_TLS, "certificate message header invalid");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
certs = bio_reader_create(data);
|
|
while (certs->remaining(certs))
|
|
{
|
|
if (!certs->read_data24(certs, &data))
|
|
{
|
|
DBG1(DBG_TLS, "certificate message invalid");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
|
|
certs->destroy(certs);
|
|
return NEED_MORE;
|
|
}
|
|
cert = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
|
|
BUILD_BLOB_ASN1_DER, data, BUILD_END);
|
|
if (cert)
|
|
{
|
|
if (first)
|
|
{
|
|
this->peer_auth->add(this->peer_auth,
|
|
AUTH_HELPER_SUBJECT_CERT, cert);
|
|
DBG1(DBG_TLS, "received TLS peer certificate '%Y'",
|
|
cert->get_subject(cert));
|
|
first = FALSE;
|
|
if (this->peer == NULL)
|
|
{ /* apply identity to authenticate */
|
|
this->peer = cert->get_subject(cert);
|
|
this->peer = this->peer->clone(this->peer);
|
|
this->peer_auth_optional = TRUE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
DBG1(DBG_TLS, "received TLS intermediate certificate '%Y'",
|
|
cert->get_subject(cert));
|
|
this->peer_auth->add(this->peer_auth, AUTH_HELPER_IM_CERT, cert);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
DBG1(DBG_TLS, "parsing TLS certificate failed, skipped");
|
|
this->alert->add(this->alert, TLS_WARNING, TLS_BAD_CERTIFICATE);
|
|
}
|
|
}
|
|
certs->destroy(certs);
|
|
this->state = STATE_CERT_RECEIVED;
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Process Client Key Exchange, using premaster encryption
|
|
*/
|
|
static status_t process_key_exchange_encrypted(private_tls_server_t *this,
|
|
bio_reader_t *reader)
|
|
{
|
|
chunk_t encrypted, decrypted;
|
|
char premaster[48];
|
|
rng_t *rng;
|
|
|
|
this->crypto->append_handshake(this->crypto,
|
|
TLS_CLIENT_KEY_EXCHANGE, reader->peek(reader));
|
|
|
|
if (!reader->read_data16(reader, &encrypted))
|
|
{
|
|
DBG1(DBG_TLS, "received invalid Client Key Exchange");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
|
|
htoun16(premaster, this->client_version);
|
|
/* pre-randomize premaster for failure cases */
|
|
rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
|
|
if (!rng || !rng->get_bytes(rng, sizeof(premaster) - 2, premaster + 2))
|
|
{
|
|
DBG1(DBG_TLS, "failed to generate premaster secret");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
DESTROY_IF(rng);
|
|
return NEED_MORE;
|
|
}
|
|
rng->destroy(rng);
|
|
|
|
if (this->private &&
|
|
this->private->decrypt(this->private,
|
|
ENCRYPT_RSA_PKCS1, encrypted, &decrypted))
|
|
{
|
|
if (decrypted.len == sizeof(premaster) &&
|
|
untoh16(decrypted.ptr) == this->client_version)
|
|
{
|
|
memcpy(premaster + 2, decrypted.ptr + 2, sizeof(premaster) - 2);
|
|
}
|
|
else
|
|
{
|
|
DBG1(DBG_TLS, "decrypted premaster has invalid length/version");
|
|
}
|
|
chunk_clear(&decrypted);
|
|
}
|
|
else
|
|
{
|
|
DBG1(DBG_TLS, "decrypting Client Key Exchange failed");
|
|
}
|
|
|
|
if (!this->crypto->derive_secrets(this->crypto, chunk_from_thing(premaster),
|
|
this->session, this->peer,
|
|
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;
|
|
}
|
|
|
|
this->state = STATE_KEY_EXCHANGE_RECEIVED;
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Process client key exchange, using DHE exchange
|
|
*/
|
|
static status_t process_key_exchange_dhe(private_tls_server_t *this,
|
|
bio_reader_t *reader)
|
|
{
|
|
chunk_t premaster, pub;
|
|
bool ec;
|
|
|
|
this->crypto->append_handshake(this->crypto,
|
|
TLS_CLIENT_KEY_EXCHANGE, reader->peek(reader));
|
|
|
|
ec = diffie_hellman_group_is_ec(this->dh->get_dh_group(this->dh));
|
|
if ((ec && !reader->read_data8(reader, &pub)) ||
|
|
(!ec && (!reader->read_data16(reader, &pub) || pub.len == 0)))
|
|
{
|
|
DBG1(DBG_TLS, "received invalid Client Key Exchange");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
|
|
if (ec)
|
|
{
|
|
if (pub.ptr[0] != TLS_ANSI_UNCOMPRESSED)
|
|
{
|
|
DBG1(DBG_TLS, "DH point format '%N' not supported",
|
|
tls_ansi_point_format_names, pub.ptr[0]);
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
pub = chunk_skip(pub, 1);
|
|
}
|
|
if (!this->dh->set_other_public_value(this->dh, pub))
|
|
{
|
|
DBG1(DBG_TLS, "applying DH public value failed");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
if (!this->dh->get_shared_secret(this->dh, &premaster))
|
|
{
|
|
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->peer,
|
|
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->state = STATE_KEY_EXCHANGE_RECEIVED;
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Process Client Key Exchange
|
|
*/
|
|
static status_t process_key_exchange(private_tls_server_t *this,
|
|
bio_reader_t *reader)
|
|
{
|
|
if (this->dh)
|
|
{
|
|
return process_key_exchange_dhe(this, reader);
|
|
}
|
|
return process_key_exchange_encrypted(this, reader);
|
|
}
|
|
|
|
/**
|
|
* Process Certificate verify
|
|
*/
|
|
static status_t process_cert_verify(private_tls_server_t *this,
|
|
bio_reader_t *reader)
|
|
{
|
|
bool verified = FALSE;
|
|
enumerator_t *enumerator;
|
|
public_key_t *public;
|
|
auth_cfg_t *auth;
|
|
bio_reader_t *sig;
|
|
|
|
enumerator = lib->credmgr->create_public_enumerator(lib->credmgr,
|
|
KEY_ANY, this->peer, this->peer_auth, TRUE);
|
|
while (enumerator->enumerate(enumerator, &public, &auth))
|
|
{
|
|
sig = bio_reader_create(reader->peek(reader));
|
|
verified = this->crypto->verify_handshake(this->crypto, public, sig);
|
|
sig->destroy(sig);
|
|
if (verified)
|
|
{
|
|
this->peer_auth->merge(this->peer_auth, auth, FALSE);
|
|
break;
|
|
}
|
|
DBG1(DBG_TLS, "signature verification failed, trying another key");
|
|
}
|
|
enumerator->destroy(enumerator);
|
|
|
|
if (!verified)
|
|
{
|
|
DBG1(DBG_TLS, "no trusted certificate found for '%Y' to verify TLS peer",
|
|
this->peer);
|
|
if (!this->peer_auth_optional)
|
|
{ /* client authentication is required */
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_CERTIFICATE_UNKNOWN);
|
|
return NEED_MORE;
|
|
}
|
|
/* reset peer identity, we couldn't authenticate it */
|
|
this->peer->destroy(this->peer);
|
|
this->peer = NULL;
|
|
this->state = STATE_KEY_EXCHANGE_RECEIVED;
|
|
}
|
|
else
|
|
{
|
|
this->state = STATE_CERT_VERIFY_RECEIVED;
|
|
}
|
|
this->crypto->append_handshake(this->crypto,
|
|
TLS_CERTIFICATE_VERIFY, reader->peek(reader));
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Process finished message
|
|
*/
|
|
static status_t process_finished(private_tls_server_t *this,
|
|
bio_reader_t *reader)
|
|
{
|
|
chunk_t received, verify_data;
|
|
u_char buf[12];
|
|
|
|
if (this->tls->get_version_max(this->tls) < TLS_1_3)
|
|
{
|
|
if (!reader->read_data(reader, sizeof(buf), &received))
|
|
{
|
|
DBG1(DBG_TLS, "received client finished too short");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
if (!this->crypto->calculate_finished_legacy(this->crypto,
|
|
"client finished", buf))
|
|
{
|
|
DBG1(DBG_TLS, "calculating client finished failed");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
verify_data = chunk_from_thing(buf);
|
|
}
|
|
else
|
|
{
|
|
received = reader->peek(reader);
|
|
if (!this->crypto->calculate_finished(this->crypto, FALSE, &verify_data))
|
|
{
|
|
DBG1(DBG_TLS, "calculating client finished failed");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
|
|
if (!this->crypto->derive_app_keys(this->crypto))
|
|
{
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
this->crypto->change_cipher(this->crypto, TRUE);
|
|
this->crypto->change_cipher(this->crypto, FALSE);
|
|
}
|
|
|
|
if (!chunk_equals_const(received, verify_data))
|
|
{
|
|
DBG1(DBG_TLS, "received client finished invalid");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_DECRYPT_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
|
|
if (verify_data.ptr != buf)
|
|
{
|
|
chunk_free(&verify_data);
|
|
}
|
|
|
|
this->crypto->append_handshake(this->crypto, TLS_FINISHED, received);
|
|
this->state = STATE_FINISHED_RECEIVED;
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Process KeyUpdate message
|
|
*/
|
|
static status_t process_key_update(private_tls_server_t *this,
|
|
bio_reader_t *reader)
|
|
{
|
|
uint8_t update_requested;
|
|
|
|
if (!reader->read_uint8(reader, &update_requested) ||
|
|
update_requested > 1)
|
|
{
|
|
DBG1(DBG_TLS, "received invalid KeyUpdate");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_DECODE_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
|
|
if (!this->crypto->update_app_keys(this->crypto, TRUE))
|
|
{
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
this->crypto->change_cipher(this->crypto, TRUE);
|
|
|
|
if (update_requested)
|
|
{
|
|
DBG1(DBG_TLS, "client requested KeyUpdate");
|
|
this->state = STATE_KEY_UPDATE_REQUESTED;
|
|
}
|
|
return NEED_MORE;
|
|
}
|
|
|
|
METHOD(tls_handshake_t, process, status_t,
|
|
private_tls_server_t *this, tls_handshake_type_t type, bio_reader_t *reader)
|
|
{
|
|
tls_handshake_type_t expected;
|
|
|
|
if (this->tls->get_version_max(this->tls) < TLS_1_3)
|
|
{
|
|
switch (this->state)
|
|
{
|
|
case STATE_INIT:
|
|
if (type == TLS_CLIENT_HELLO)
|
|
{
|
|
return process_client_hello(this, reader);
|
|
}
|
|
expected = TLS_CLIENT_HELLO;
|
|
break;
|
|
case STATE_HELLO_DONE:
|
|
if (type == TLS_CERTIFICATE)
|
|
{
|
|
return process_certificate(this, reader);
|
|
}
|
|
if (this->peer)
|
|
{
|
|
expected = TLS_CERTIFICATE;
|
|
break;
|
|
}
|
|
/* otherwise fall through to next state */
|
|
case STATE_CERT_RECEIVED:
|
|
if (type == TLS_CLIENT_KEY_EXCHANGE)
|
|
{
|
|
return process_key_exchange(this, reader);
|
|
}
|
|
expected = TLS_CLIENT_KEY_EXCHANGE;
|
|
break;
|
|
case STATE_KEY_EXCHANGE_RECEIVED:
|
|
if (type == TLS_CERTIFICATE_VERIFY)
|
|
{
|
|
return process_cert_verify(this, reader);
|
|
}
|
|
if (this->peer)
|
|
{
|
|
expected = TLS_CERTIFICATE_VERIFY;
|
|
break;
|
|
}
|
|
return INVALID_STATE;
|
|
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;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
switch (this->state)
|
|
{
|
|
case STATE_INIT:
|
|
if (type == TLS_CLIENT_HELLO)
|
|
{
|
|
return process_client_hello(this, reader);
|
|
}
|
|
expected = TLS_CLIENT_HELLO;
|
|
break;
|
|
case STATE_CIPHERSPEC_CHANGED_IN:
|
|
case STATE_FINISHED_SENT:
|
|
if (type == TLS_FINISHED)
|
|
{
|
|
return process_finished(this, reader);
|
|
}
|
|
return NEED_MORE;
|
|
case STATE_FINISHED_RECEIVED:
|
|
if (type == TLS_KEY_UPDATE)
|
|
{
|
|
return process_key_update(this, reader);
|
|
}
|
|
return INVALID_STATE;
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* Write public key into key share extension
|
|
*/
|
|
bool tls_write_key_share(bio_writer_t **key_share, diffie_hellman_t *dh)
|
|
{
|
|
bio_writer_t *writer;
|
|
tls_named_group_t curve;
|
|
chunk_t pub;
|
|
|
|
if (!dh)
|
|
{
|
|
return FALSE;
|
|
}
|
|
curve = tls_ec_group_to_curve(dh->get_dh_group(dh));
|
|
if (!curve || !dh->get_my_public_value(dh, &pub))
|
|
{
|
|
return FALSE;
|
|
}
|
|
*key_share = writer = bio_writer_create(pub.len + 7);
|
|
writer->write_uint16(writer, curve);
|
|
if (curve == TLS_CURVE25519 ||
|
|
curve == TLS_CURVE448)
|
|
{
|
|
writer->write_data16(writer, pub);
|
|
}
|
|
else
|
|
{ /* classic format (see RFC 8446, section 4.2.8.2) */
|
|
writer->write_uint16(writer, pub.len + 1);
|
|
writer->write_uint8(writer, TLS_ANSI_UNCOMPRESSED);
|
|
writer->write_data(writer, pub);
|
|
}
|
|
free(pub.ptr);
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* Send ServerHello message
|
|
*/
|
|
static status_t send_server_hello(private_tls_server_t *this,
|
|
tls_handshake_type_t *type, bio_writer_t *writer)
|
|
{
|
|
bio_writer_t *key_share, *extensions;
|
|
tls_version_t version;
|
|
|
|
version = this->tls->get_version_max(this->tls);
|
|
|
|
/* cap legacy version at TLS 1.2 for middlebox compatibility */
|
|
writer->write_uint16(writer, min(TLS_1_2, version));
|
|
|
|
if (this->requested_curve)
|
|
{
|
|
writer->write_data(writer, tls_hello_retry_request_magic);
|
|
}
|
|
else
|
|
{
|
|
writer->write_data(writer, chunk_from_thing(this->server_random));
|
|
}
|
|
|
|
/* session identifier if we have one */
|
|
writer->write_data8(writer, this->session);
|
|
|
|
/* add selected TLS cipher suite */
|
|
writer->write_uint16(writer, this->suite);
|
|
|
|
/* NULL compression only */
|
|
writer->write_uint8(writer, 0);
|
|
|
|
if (version >= TLS_1_3)
|
|
{
|
|
extensions = bio_writer_create(32);
|
|
|
|
DBG2(DBG_TLS, "sending extension: %N",
|
|
tls_extension_names, TLS_EXT_SUPPORTED_VERSIONS);
|
|
extensions->write_uint16(extensions, TLS_EXT_SUPPORTED_VERSIONS);
|
|
extensions->write_uint16(extensions, 2);
|
|
extensions->write_uint16(extensions, version);
|
|
|
|
DBG2(DBG_TLS, "sending extension: %N",
|
|
tls_extension_names, TLS_EXT_KEY_SHARE);
|
|
extensions->write_uint16(extensions, TLS_EXT_KEY_SHARE);
|
|
if (this->requested_curve)
|
|
{
|
|
DBG1(DBG_TLS, "requesting key exchange with %N",
|
|
tls_named_group_names, this->requested_curve);
|
|
extensions->write_uint16(extensions, 2);
|
|
extensions->write_uint16(extensions, this->requested_curve);
|
|
}
|
|
else
|
|
{
|
|
if (!tls_write_key_share(&key_share, this->dh))
|
|
{
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
extensions->destroy(extensions);
|
|
return NEED_MORE;
|
|
}
|
|
extensions->write_data16(extensions, key_share->get_buf(key_share));
|
|
key_share->destroy(key_share);
|
|
}
|
|
|
|
writer->write_data16(writer, extensions->get_buf(extensions));
|
|
extensions->destroy(extensions);
|
|
}
|
|
|
|
*type = TLS_SERVER_HELLO;
|
|
this->state = this->requested_curve ? STATE_INIT : STATE_HELLO_SENT;
|
|
this->crypto->append_handshake(this->crypto, *type, writer->get_buf(writer));
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Send encrypted extensions message
|
|
*/
|
|
static status_t send_encrypted_extensions(private_tls_server_t *this,
|
|
tls_handshake_type_t *type,
|
|
bio_writer_t *writer)
|
|
{
|
|
chunk_t shared_secret = chunk_empty;
|
|
|
|
if (!this->dh->get_shared_secret(this->dh, &shared_secret) ||
|
|
!this->crypto->derive_handshake_keys(this->crypto, shared_secret))
|
|
{
|
|
DBG1(DBG_TLS, "DH key derivation failed");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_HANDSHAKE_FAILURE);
|
|
chunk_clear(&shared_secret);
|
|
return NEED_MORE;
|
|
}
|
|
chunk_clear(&shared_secret);
|
|
|
|
this->crypto->change_cipher(this->crypto, TRUE);
|
|
this->crypto->change_cipher(this->crypto, FALSE);
|
|
|
|
/* currently no extensions are supported */
|
|
writer->write_uint16(writer, 0);
|
|
|
|
*type = TLS_ENCRYPTED_EXTENSIONS;
|
|
this->state = STATE_ENCRYPTED_EXTENSIONS_SENT;
|
|
this->crypto->append_handshake(this->crypto, *type, writer->get_buf(writer));
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Send Certificate
|
|
*/
|
|
static status_t send_certificate(private_tls_server_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;
|
|
|
|
/* certificate request context as described in RFC 8446, section 4.4.2 */
|
|
if (this->tls->get_version_max(this->tls) > TLS_1_2)
|
|
{
|
|
writer->write_uint8(writer, 0);
|
|
}
|
|
|
|
/* generate certificate payload */
|
|
certs = bio_writer_create(256);
|
|
cert = this->server_auth->get(this->server_auth, AUTH_RULE_SUBJECT_CERT);
|
|
if (cert)
|
|
{
|
|
if (cert->get_encoding(cert, CERT_ASN1_DER, &data))
|
|
{
|
|
DBG1(DBG_TLS, "sending TLS server certificate '%Y'",
|
|
cert->get_subject(cert));
|
|
certs->write_data24(certs, data);
|
|
free(data.ptr);
|
|
}
|
|
/* extensions see RFC 8446, section 4.4.2 */
|
|
if (this->tls->get_version_max(this->tls) > TLS_1_2)
|
|
{
|
|
certs->write_uint16(certs, 0);
|
|
}
|
|
}
|
|
enumerator = this->server_auth->create_enumerator(this->server_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 Certificate Verify
|
|
*/
|
|
static status_t send_certificate_verify(private_tls_server_t *this,
|
|
tls_handshake_type_t *type,
|
|
bio_writer_t *writer)
|
|
{
|
|
if (!this->crypto->sign_handshake(this->crypto, this->private, writer,
|
|
this->hashsig))
|
|
{
|
|
DBG1(DBG_TLS, "signature generation failed");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
|
|
*type = TLS_CERTIFICATE_VERIFY;
|
|
this->state = STATE_CERT_VERIFY_SENT;
|
|
this->crypto->append_handshake(this->crypto, *type, writer->get_buf(writer));
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Send Certificate Request
|
|
*/
|
|
static status_t send_certificate_request(private_tls_server_t *this,
|
|
tls_handshake_type_t *type, bio_writer_t *writer)
|
|
{
|
|
bio_writer_t *authorities, *supported;
|
|
enumerator_t *enumerator;
|
|
certificate_t *cert;
|
|
x509_t *x509;
|
|
identification_t *id;
|
|
|
|
supported = bio_writer_create(4);
|
|
/* we propose both RSA and ECDSA */
|
|
supported->write_uint8(supported, TLS_RSA_SIGN);
|
|
supported->write_uint8(supported, TLS_ECDSA_SIGN);
|
|
writer->write_data8(writer, supported->get_buf(supported));
|
|
supported->destroy(supported);
|
|
if (this->tls->get_version_max(this->tls) >= TLS_1_2)
|
|
{
|
|
this->crypto->get_signature_algorithms(this->crypto, writer, TRUE);
|
|
}
|
|
|
|
authorities = bio_writer_create(64);
|
|
enumerator = lib->credmgr->create_cert_enumerator(lib->credmgr,
|
|
CERT_X509, KEY_RSA, NULL, TRUE);
|
|
while (enumerator->enumerate(enumerator, &cert))
|
|
{
|
|
x509 = (x509_t*)cert;
|
|
if (x509->get_flags(x509) & X509_CA)
|
|
{
|
|
id = cert->get_subject(cert);
|
|
DBG1(DBG_TLS, "sending TLS cert request for '%Y'", id);
|
|
authorities->write_data16(authorities, id->get_encoding(id));
|
|
}
|
|
}
|
|
enumerator->destroy(enumerator);
|
|
writer->write_data16(writer, authorities->get_buf(authorities));
|
|
authorities->destroy(authorities);
|
|
|
|
*type = TLS_CERTIFICATE_REQUEST;
|
|
this->state = STATE_CERTREQ_SENT;
|
|
this->crypto->append_handshake(this->crypto, *type, writer->get_buf(writer));
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Try to find a curve supported by both, client and server
|
|
*/
|
|
static bool find_supported_curve(private_tls_server_t *this,
|
|
tls_named_group_t *curve)
|
|
{
|
|
tls_named_group_t current;
|
|
enumerator_t *enumerator;
|
|
|
|
enumerator = this->crypto->create_ec_enumerator(this->crypto);
|
|
while (enumerator->enumerate(enumerator, NULL, ¤t))
|
|
{
|
|
if (peer_supports_curve(this, current))
|
|
{
|
|
*curve = current;
|
|
enumerator->destroy(enumerator);
|
|
return TRUE;
|
|
}
|
|
}
|
|
enumerator->destroy(enumerator);
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* Send Server key Exchange
|
|
*/
|
|
static status_t send_server_key_exchange(private_tls_server_t *this,
|
|
tls_handshake_type_t *type, bio_writer_t *writer,
|
|
diffie_hellman_group_t group)
|
|
{
|
|
diffie_hellman_params_t *params = NULL;
|
|
tls_named_group_t curve;
|
|
chunk_t chunk;
|
|
|
|
if (diffie_hellman_group_is_ec(group))
|
|
{
|
|
curve = tls_ec_group_to_curve(group);
|
|
if (!curve || (!peer_supports_curve(this, curve) &&
|
|
!find_supported_curve(this, &curve)))
|
|
{
|
|
DBG1(DBG_TLS, "no EC group supported by client and server");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_HANDSHAKE_FAILURE);
|
|
return NEED_MORE;
|
|
}
|
|
DBG2(DBG_TLS, "selected ECDH group %N", tls_named_group_names, curve);
|
|
writer->write_uint8(writer, TLS_ECC_NAMED_CURVE);
|
|
writer->write_uint16(writer, curve);
|
|
}
|
|
else
|
|
{
|
|
params = diffie_hellman_get_params(group);
|
|
if (!params)
|
|
{
|
|
DBG1(DBG_TLS, "no parameters found for DH group %N",
|
|
diffie_hellman_group_names, group);
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
DBG2(DBG_TLS, "selected DH group %N", diffie_hellman_group_names, group);
|
|
writer->write_data16(writer, params->prime);
|
|
writer->write_data16(writer, params->generator);
|
|
}
|
|
this->dh = lib->crypto->create_dh(lib->crypto, group);
|
|
if (!this->dh)
|
|
{
|
|
DBG1(DBG_TLS, "DH group %N not supported",
|
|
diffie_hellman_group_names, group);
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
if (!this->dh->get_my_public_value(this->dh, &chunk))
|
|
{
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
if (params)
|
|
{
|
|
writer->write_data16(writer, chunk);
|
|
}
|
|
else
|
|
{ /* ECP uses 8bit length header only, but a point format */
|
|
writer->write_uint8(writer, chunk.len + 1);
|
|
writer->write_uint8(writer, TLS_ANSI_UNCOMPRESSED);
|
|
writer->write_data(writer, chunk);
|
|
}
|
|
free(chunk.ptr);
|
|
|
|
chunk = chunk_cat("ccc", chunk_from_thing(this->client_random),
|
|
chunk_from_thing(this->server_random), writer->get_buf(writer));
|
|
if (!this->private || !this->crypto->sign(this->crypto, this->private,
|
|
writer, chunk, this->hashsig))
|
|
{
|
|
DBG1(DBG_TLS, "signing DH parameters failed");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
free(chunk.ptr);
|
|
return NEED_MORE;
|
|
}
|
|
free(chunk.ptr);
|
|
*type = TLS_SERVER_KEY_EXCHANGE;
|
|
this->state = STATE_KEY_EXCHANGE_SENT;
|
|
this->crypto->append_handshake(this->crypto, *type, writer->get_buf(writer));
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Send Hello Done
|
|
*/
|
|
static status_t send_hello_done(private_tls_server_t *this,
|
|
tls_handshake_type_t *type, bio_writer_t *writer)
|
|
{
|
|
*type = TLS_SERVER_HELLO_DONE;
|
|
this->state = STATE_HELLO_DONE;
|
|
this->crypto->append_handshake(this->crypto, *type, writer->get_buf(writer));
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Send Finished
|
|
*/
|
|
static status_t send_finished(private_tls_server_t *this,
|
|
tls_handshake_type_t *type, bio_writer_t *writer)
|
|
{
|
|
if (this->tls->get_version_max(this->tls) < TLS_1_3)
|
|
{
|
|
char buf[12];
|
|
|
|
if (!this->crypto->calculate_finished_legacy(this->crypto,
|
|
"server finished", buf))
|
|
{
|
|
DBG1(DBG_TLS, "calculating server finished data failed");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return FAILED;
|
|
}
|
|
|
|
writer->write_data(writer, chunk_from_thing(buf));
|
|
}
|
|
else
|
|
{
|
|
chunk_t verify_data;
|
|
|
|
if (!this->crypto->calculate_finished(this->crypto, TRUE, &verify_data))
|
|
{
|
|
DBG1(DBG_TLS, "calculating server finished data failed");
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
|
|
writer->write_data(writer, verify_data);
|
|
chunk_free(&verify_data);
|
|
}
|
|
|
|
*type = TLS_FINISHED;
|
|
this->state = STATE_FINISHED_SENT;
|
|
this->crypto->append_handshake(this->crypto, *type, writer->get_buf(writer));
|
|
|
|
return NEED_MORE;
|
|
}
|
|
|
|
/**
|
|
* Send KeyUpdate message
|
|
*/
|
|
static status_t send_key_update(private_tls_server_t *this,
|
|
tls_handshake_type_t *type, bio_writer_t *writer)
|
|
{
|
|
*type = TLS_KEY_UPDATE;
|
|
|
|
/* we currently only send this as reply, so we never request an update */
|
|
writer->write_uint8(writer, 0);
|
|
|
|
this->state = STATE_KEY_UPDATE_SENT;
|
|
return NEED_MORE;
|
|
}
|
|
|
|
METHOD(tls_handshake_t, build, status_t,
|
|
private_tls_server_t *this, tls_handshake_type_t *type, bio_writer_t *writer)
|
|
{
|
|
diffie_hellman_group_t group;
|
|
|
|
if (this->tls->get_version_max(this->tls) < TLS_1_3)
|
|
{
|
|
switch (this->state)
|
|
{
|
|
case STATE_HELLO_RECEIVED:
|
|
return send_server_hello(this, type, writer);
|
|
case STATE_HELLO_SENT:
|
|
return send_certificate(this, type, writer);
|
|
case STATE_CERT_SENT:
|
|
group = this->crypto->get_dh_group(this->crypto);
|
|
if (group)
|
|
{
|
|
return send_server_key_exchange(this, type, writer, group);
|
|
}
|
|
/* otherwise fall through to next state */
|
|
case STATE_KEY_EXCHANGE_SENT:
|
|
return send_certificate_request(this, type, writer);
|
|
case STATE_CERTREQ_SENT:
|
|
return send_hello_done(this, type, writer);
|
|
case STATE_CIPHERSPEC_CHANGED_OUT:
|
|
return send_finished(this, type, writer);
|
|
case STATE_FINISHED_SENT:
|
|
return INVALID_STATE;
|
|
default:
|
|
return INVALID_STATE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
switch (this->state)
|
|
{
|
|
case STATE_HELLO_RECEIVED:
|
|
return send_server_hello(this, type, writer);
|
|
case STATE_HELLO_SENT:
|
|
case STATE_CIPHERSPEC_CHANGED_OUT:
|
|
return send_encrypted_extensions(this, type, writer);
|
|
case STATE_ENCRYPTED_EXTENSIONS_SENT:
|
|
return send_certificate(this, type, writer);
|
|
case STATE_CERT_SENT:
|
|
return send_certificate_verify(this, type, writer);
|
|
case STATE_CERT_VERIFY_SENT:
|
|
return send_finished(this, type, writer);
|
|
case STATE_FINISHED_SENT:
|
|
return INVALID_STATE;
|
|
case STATE_KEY_UPDATE_REQUESTED:
|
|
return send_key_update(this, type, writer);
|
|
case STATE_KEY_UPDATE_SENT:
|
|
if (!this->crypto->update_app_keys(this->crypto, FALSE))
|
|
{
|
|
this->alert->add(this->alert, TLS_FATAL, TLS_INTERNAL_ERROR);
|
|
return NEED_MORE;
|
|
}
|
|
this->crypto->change_cipher(this->crypto, FALSE);
|
|
this->state = STATE_FINISHED_RECEIVED;
|
|
default:
|
|
return INVALID_STATE;
|
|
}
|
|
}
|
|
}
|
|
|
|
METHOD(tls_handshake_t, cipherspec_changed, bool,
|
|
private_tls_server_t *this, bool inbound)
|
|
{
|
|
if (this->tls->get_version_max(this->tls) < TLS_1_3)
|
|
{
|
|
if (inbound)
|
|
{
|
|
if (this->resume)
|
|
{
|
|
return this->state == STATE_FINISHED_SENT;
|
|
}
|
|
if (this->peer)
|
|
{
|
|
return this->state == STATE_CERT_VERIFY_RECEIVED;
|
|
}
|
|
return this->state == STATE_KEY_EXCHANGE_RECEIVED;
|
|
}
|
|
else
|
|
{
|
|
if (this->resume)
|
|
{
|
|
return this->state == STATE_HELLO_SENT;
|
|
}
|
|
return this->state == STATE_FINISHED_RECEIVED;
|
|
}
|
|
return FALSE;
|
|
}
|
|
else
|
|
{
|
|
if (inbound)
|
|
{ /* accept ChangeCipherSpec after ServerFinish or HelloRetryRequest */
|
|
return this->state == STATE_FINISHED_SENT || retrying(this);
|
|
}
|
|
else
|
|
{
|
|
return this->state == STATE_HELLO_SENT;
|
|
}
|
|
}
|
|
}
|
|
|
|
METHOD(tls_handshake_t, change_cipherspec, void,
|
|
private_tls_server_t *this, bool inbound)
|
|
{
|
|
if (this->tls->get_version_max(this->tls) < TLS_1_3)
|
|
{
|
|
this->crypto->change_cipher(this->crypto, inbound);
|
|
}
|
|
|
|
if (retrying(this))
|
|
{ /* client might send a ChangeCipherSpec after a HelloRetryRequest and
|
|
* before a new ClientHello which should not cause any state changes */
|
|
return;
|
|
}
|
|
|
|
if (inbound)
|
|
{
|
|
this->state = STATE_CIPHERSPEC_CHANGED_IN;
|
|
}
|
|
else
|
|
{
|
|
this->state = STATE_CIPHERSPEC_CHANGED_OUT;
|
|
}
|
|
}
|
|
|
|
METHOD(tls_handshake_t, finished, bool,
|
|
private_tls_server_t *this)
|
|
{
|
|
if (this->tls->get_version_max(this->tls) < TLS_1_3)
|
|
{
|
|
if (this->resume)
|
|
{
|
|
return this->state == STATE_FINISHED_RECEIVED;
|
|
}
|
|
return this->state == STATE_FINISHED_SENT;
|
|
}
|
|
else
|
|
{
|
|
return this->state == STATE_FINISHED_RECEIVED;
|
|
}
|
|
}
|
|
|
|
METHOD(tls_handshake_t, get_peer_id, identification_t*,
|
|
private_tls_server_t *this)
|
|
{
|
|
return this->peer;
|
|
}
|
|
|
|
METHOD(tls_handshake_t, get_server_id, identification_t*,
|
|
private_tls_server_t *this)
|
|
{
|
|
return this->server;
|
|
}
|
|
|
|
METHOD(tls_handshake_t, get_auth, auth_cfg_t*,
|
|
private_tls_server_t *this)
|
|
{
|
|
return this->peer_auth;
|
|
}
|
|
|
|
METHOD(tls_handshake_t, destroy, void,
|
|
private_tls_server_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->curves.ptr);
|
|
free(this->session.ptr);
|
|
free(this);
|
|
}
|
|
|
|
/**
|
|
* See header
|
|
*/
|
|
tls_server_t *tls_server_create(tls_t *tls,
|
|
tls_crypto_t *crypto, tls_alert_t *alert,
|
|
identification_t *server, identification_t *peer)
|
|
{
|
|
private_tls_server_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,
|
|
.get_auth = _get_auth,
|
|
.destroy = _destroy,
|
|
},
|
|
},
|
|
.tls = tls,
|
|
.crypto = crypto,
|
|
.alert = alert,
|
|
.server = server->clone(server),
|
|
.peer = peer ? peer->clone(peer) : NULL,
|
|
.state = STATE_INIT,
|
|
.peer_auth = auth_cfg_create(),
|
|
.server_auth = auth_cfg_create(),
|
|
);
|
|
|
|
return &this->public;
|
|
}
|