tlsv1_server_read.c

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/*
 * TLSv1 server - read handshake message
 * Copyright (c) 2006-2007, Jouni Malinen <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"

#include "common.h"
#include "md5.h"
#include "sha1.h"
#include "x509v3.h"
#include "tls.h"
#include "tlsv1_common.h"
#include "tlsv1_record.h"
#include "tlsv1_server.h"
#include "tlsv1_server_i.h"


static int tls_process_client_key_exchange(struct tlsv1_server *conn, u8 ct,
					   const u8 *in_data, size_t *in_len);
static int tls_process_change_cipher_spec(struct tlsv1_server *conn,
					  u8 ct, const u8 *in_data,
					  size_t *in_len);


static int tls_process_client_hello(struct tlsv1_server *conn, u8 ct,
				    const u8 *in_data, size_t *in_len)
{
	const u8 *pos, *end, *c;
	size_t left, len, i, j;
	u16 cipher_suite;
	u16 num_suites;
	int compr_null_found;

	if (ct != TLS_CONTENT_TYPE_HANDSHAKE) {
		wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; "
			   "received content type 0x%x", ct);
		tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
				   TLS_ALERT_UNEXPECTED_MESSAGE);
		return -1;
	}

	pos = in_data;
	left = *in_len;

	if (left < 4)
		goto decode_error;

	/* HandshakeType msg_type */
	if (*pos != TLS_HANDSHAKE_TYPE_CLIENT_HELLO) {
		wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake "
			   "message %d (expected ClientHello)", *pos);
		tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
				   TLS_ALERT_UNEXPECTED_MESSAGE);
		return -1;
	}
	wpa_printf(MSG_DEBUG, "TLSv1: Received ClientHello");
	pos++;
	/* uint24 length */
	len = WPA_GET_BE24(pos);
	pos += 3;
	left -= 4;

	if (len > left)
		goto decode_error;

	/* body - ClientHello */

	wpa_hexdump(MSG_MSGDUMP, "TLSv1: ClientHello", pos, len);
	end = pos + len;

	/* ProtocolVersion client_version */
	if (end - pos < 2)
		goto decode_error;
	conn->client_version = WPA_GET_BE16(pos);
	wpa_printf(MSG_DEBUG, "TLSv1: Client version %d.%d",
		   conn->client_version >> 8, conn->client_version & 0xff);
	if (conn->client_version < TLS_VERSION) {
		wpa_printf(MSG_DEBUG, "TLSv1: Unexpected protocol version in "
			   "ClientHello");
		tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
				   TLS_ALERT_PROTOCOL_VERSION);
		return -1;
	}
	pos += 2;

	/* Random random */
	if (end - pos < TLS_RANDOM_LEN)
		goto decode_error;

	os_memcpy(conn->client_random, pos, TLS_RANDOM_LEN);
	pos += TLS_RANDOM_LEN;
	wpa_hexdump(MSG_MSGDUMP, "TLSv1: client_random",
		    conn->client_random, TLS_RANDOM_LEN);

	/* SessionID session_id */
	if (end - pos < 1)
		goto decode_error;
	if (end - pos < 1 + *pos || *pos > TLS_SESSION_ID_MAX_LEN)
		goto decode_error;
	wpa_hexdump(MSG_MSGDUMP, "TLSv1: client session_id", pos + 1, *pos);
	pos += 1 + *pos;
	/* TODO: add support for session resumption */

	/* CipherSuite cipher_suites<2..2^16-1> */
	if (end - pos < 2)
		goto decode_error;
	num_suites = WPA_GET_BE16(pos);
	pos += 2;
	if (end - pos < num_suites)
		goto decode_error;
	wpa_hexdump(MSG_MSGDUMP, "TLSv1: client cipher suites",
		    pos, num_suites);
	if (num_suites & 1)
		goto decode_error;
	num_suites /= 2;

	cipher_suite = 0;
	for (i = 0; !cipher_suite && i < conn->num_cipher_suites; i++) {
		c = pos;
		for (j = 0; j < num_suites; j++) {
			u16 tmp = WPA_GET_BE16(c);
			c += 2;
			if (!cipher_suite && tmp == conn->cipher_suites[i]) {
				cipher_suite = tmp;
				break;
			}
		}
	}
	pos += num_suites * 2;
	if (!cipher_suite) {
		wpa_printf(MSG_INFO, "TLSv1: No supported cipher suite "
			   "available");
		tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
				   TLS_ALERT_ILLEGAL_PARAMETER);
		return -1;
	}

	if (tlsv1_record_set_cipher_suite(&conn->rl, cipher_suite) < 0) {
		wpa_printf(MSG_DEBUG, "TLSv1: Failed to set CipherSuite for "
			   "record layer");
		tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
				   TLS_ALERT_INTERNAL_ERROR);
		return -1;
	}

	conn->cipher_suite = cipher_suite;

	/* CompressionMethod compression_methods<1..2^8-1> */
	if (end - pos < 1)
		goto decode_error;
	num_suites = *pos++;
	if (end - pos < num_suites)
		goto decode_error;
	wpa_hexdump(MSG_MSGDUMP, "TLSv1: client compression_methods",
		    pos, num_suites);
	compr_null_found = 0;
	for (i = 0; i < num_suites; i++) {
		if (*pos++ == TLS_COMPRESSION_NULL)
			compr_null_found = 1;
	}
	if (!compr_null_found) {
		wpa_printf(MSG_INFO, "TLSv1: Client does not accept NULL "
			   "compression");
		tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
				   TLS_ALERT_ILLEGAL_PARAMETER);
		return -1;
	}

	if (end - pos == 1) {
		wpa_printf(MSG_DEBUG, "TLSv1: Unexpected extra octet in the "
			    "end of ClientHello: 0x%02x", *pos);
		goto decode_error;
	}

	if (end - pos >= 2) {
		u16 ext_len;

		/* Extension client_hello_extension_list<0..2^16-1> */

		ext_len = WPA_GET_BE16(pos);
		pos += 2;

		wpa_printf(MSG_DEBUG, "TLSv1: %u bytes of ClientHello "
			   "extensions", ext_len);
		if (end - pos != ext_len) {
			wpa_printf(MSG_DEBUG, "TLSv1: Invalid ClientHello "
				   "extension list length %u (expected %u)",
				   ext_len, end - pos);
			goto decode_error;
		}

		/*
		 * struct {
		 *   ExtensionType extension_type (0..65535)
		 *   opaque extension_data<0..2^16-1>
		 * } Extension;
		 */

		while (pos < end) {
			u16 ext_type, ext_len;

			if (end - pos < 2) {
				wpa_printf(MSG_DEBUG, "TLSv1: Invalid "
					   "extension_type field");
				goto decode_error;
			}

			ext_type = WPA_GET_BE16(pos);
			pos += 2;

			if (end - pos < 2) {
				wpa_printf(MSG_DEBUG, "TLSv1: Invalid "
					   "extension_data length field");
				goto decode_error;
			}

			ext_len = WPA_GET_BE16(pos);
			pos += 2;

			if (end - pos < ext_len) {
				wpa_printf(MSG_DEBUG, "TLSv1: Invalid "
					   "extension_data field");
				goto decode_error;
			}

			wpa_printf(MSG_DEBUG, "TLSv1: ClientHello Extension "
				   "type %u", ext_type);
			wpa_hexdump(MSG_MSGDUMP, "TLSv1: ClientHello "
				    "Extension data", pos, ext_len);

			if (ext_type == TLS_EXT_SESSION_TICKET) {
				os_free(conn->session_ticket);
				conn->session_ticket = os_malloc(ext_len);
				if (conn->session_ticket) {
					os_memcpy(conn->session_ticket, pos,
						  ext_len);
					conn->session_ticket_len = ext_len;
				}
			}

			pos += ext_len;
		}
	}

	*in_len = end - in_data;

	wpa_printf(MSG_DEBUG, "TLSv1: ClientHello OK - proceed to "
		   "ServerHello");
	conn->state = SERVER_HELLO;

	return 0;

decode_error:
	wpa_printf(MSG_DEBUG, "TLSv1: Failed to decode ClientHello");
	tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
			   TLS_ALERT_DECODE_ERROR);
	return -1;
}


static int tls_process_certificate(struct tlsv1_server *conn, u8 ct,
				   const u8 *in_data, size_t *in_len)
{
	const u8 *pos, *end;
	size_t left, len, list_len, cert_len, idx;
	u8 type;
	struct x509_certificate *chain = NULL, *last = NULL, *cert;
	int reason;

	if (ct != TLS_CONTENT_TYPE_HANDSHAKE) {
		wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; "
			   "received content type 0x%x", ct);
		tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
				   TLS_ALERT_UNEXPECTED_MESSAGE);
		return -1;
	}

	pos = in_data;
	left = *in_len;

	if (left < 4) {
		wpa_printf(MSG_DEBUG, "TLSv1: Too short Certificate message "
			   "(len=%lu)", (unsigned long) left);
		tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
				   TLS_ALERT_DECODE_ERROR);
		return -1;
	}

	type = *pos++;
	len = WPA_GET_BE24(pos);
	pos += 3;
	left -= 4;

	if (len > left) {
		wpa_printf(MSG_DEBUG, "TLSv1: Unexpected Certificate message "
			   "length (len=%lu != left=%lu)",
			   (unsigned long) len, (unsigned long) left);
		tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
				   TLS_ALERT_DECODE_ERROR);
		return -1;
	}

	if (type == TLS_HANDSHAKE_TYPE_CLIENT_KEY_EXCHANGE) {
		if (conn->verify_peer) {
			wpa_printf(MSG_DEBUG, "TLSv1: Client did not include "
				   "Certificate");
			tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
					   TLS_ALERT_UNEXPECTED_MESSAGE);
			return -1;
		}

		return tls_process_client_key_exchange(conn, ct, in_data,
						       in_len);
	}
	if (type != TLS_HANDSHAKE_TYPE_CERTIFICATE) {
		wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake "
			   "message %d (expected Certificate/"
			   "ClientKeyExchange)", type);
		tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
				   TLS_ALERT_UNEXPECTED_MESSAGE);
		return -1;
	}

	wpa_printf(MSG_DEBUG,
		   "TLSv1: Received Certificate (certificate_list len %lu)",
		   (unsigned long) len);

	/*
	 * opaque ASN.1Cert<2^24-1>;
	 *
	 * struct {
	 *     ASN.1Cert certificate_list<1..2^24-1>;
	 * } Certificate;
	 */

	end = pos + len;

	if (end - pos < 3) {
		wpa_printf(MSG_DEBUG, "TLSv1: Too short Certificate "
			   "(left=%lu)", (unsigned long) left);
		tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
				   TLS_ALERT_DECODE_ERROR);
		return -1;
	}

	list_len = WPA_GET_BE24(pos);
	pos += 3;

	if ((size_t) (end - pos) != list_len) {
		wpa_printf(MSG_DEBUG, "TLSv1: Unexpected certificate_list "
			   "length (len=%lu left=%lu)",
			   (unsigned long) list_len,
			   (unsigned long) (end - pos));
		tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
				   TLS_ALERT_DECODE_ERROR);
		return -1;
	}

	idx = 0;
	while (pos < end) {
		if (end - pos < 3) {
			wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse "
				   "certificate_list");
			tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
					   TLS_ALERT_DECODE_ERROR);
			x509_certificate_chain_free(chain);
			return -1;
		}

		cert_len = WPA_GET_BE24(pos);
		pos += 3;

		if ((size_t) (end - pos) < cert_len) {
			wpa_printf(MSG_DEBUG, "TLSv1: Unexpected certificate "
				   "length (len=%lu left=%lu)",
				   (unsigned long) cert_len,
				   (unsigned long) (end - pos));
			tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
					   TLS_ALERT_DECODE_ERROR);
			x509_certificate_chain_free(chain);
			return -1;
		}

		wpa_printf(MSG_DEBUG, "TLSv1: Certificate %lu (len %lu)",
			   (unsigned long) idx, (unsigned long) cert_len);

		if (idx == 0) {
			crypto_public_key_free(conn->client_rsa_key);
			if (tls_parse_cert(pos, cert_len,
					   &conn->client_rsa_key)) {
				wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse "
					   "the certificate");
				tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
						   TLS_ALERT_BAD_CERTIFICATE);
				x509_certificate_chain_free(chain);
				return -1;
			}
		}

		cert = x509_certificate_parse(pos, cert_len);
		if (cert == NULL) {
			wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse "
				   "the certificate");
			tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
					   TLS_ALERT_BAD_CERTIFICATE);
			x509_certificate_chain_free(chain);
			return -1;
		}

		if (last == NULL)
			chain = cert;
		else
			last->next = cert;
		last = cert;

		idx++;
		pos += cert_len;
	}

	if (x509_certificate_chain_validate(conn->cred->trusted_certs, chain,
					    &reason) < 0) {
		int tls_reason;
		wpa_printf(MSG_DEBUG, "TLSv1: Server certificate chain "
			   "validation failed (reason=%d)", reason);
		switch (reason) {
		case X509_VALIDATE_BAD_CERTIFICATE:
			tls_reason = TLS_ALERT_BAD_CERTIFICATE;
			break;
		case X509_VALIDATE_UNSUPPORTED_CERTIFICATE:
			tls_reason = TLS_ALERT_UNSUPPORTED_CERTIFICATE;
			break;
		case X509_VALIDATE_CERTIFICATE_REVOKED:
			tls_reason = TLS_ALERT_CERTIFICATE_REVOKED;
			break;
		case X509_VALIDATE_CERTIFICATE_EXPIRED:
			tls_reason = TLS_ALERT_CERTIFICATE_EXPIRED;
			break;
		case X509_VALIDATE_CERTIFICATE_UNKNOWN:
			tls_reason = TLS_ALERT_CERTIFICATE_UNKNOWN;
			break;
		case X509_VALIDATE_UNKNOWN_CA:
			tls_reason = TLS_ALERT_UNKNOWN_CA;
			break;
		default:
			tls_reason = TLS_ALERT_BAD_CERTIFICATE;
			break;
		}
		tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, tls_reason);
		x509_certificate_chain_free(chain);
		return -1;
	}

	x509_certificate_chain_free(chain);

	*in_len = end - in_data;

	conn->state = CLIENT_KEY_EXCHANGE;

	return 0;
}


static int tls_process_client_key_exchange_rsa(
	struct tlsv1_server *conn, const u8 *pos, const u8 *end)
{
	u8 *out;
	size_t outlen, outbuflen;
	u16 encr_len;
	int res;
	int use_random = 0;

	if (end - pos < 2) {
		tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
				   TLS_ALERT_DECODE_ERROR);
		return -1;
	}

	encr_len = WPA_GET_BE16(pos);
	pos += 2;

	outbuflen = outlen = end - pos;
	out = os_malloc(outlen >= TLS_PRE_MASTER_SECRET_LEN ?
			outlen : TLS_PRE_MASTER_SECRET_LEN);
	if (out == NULL) {
		tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
				   TLS_ALERT_INTERNAL_ERROR);
		return -1;
	}

	/*
	 * struct {
	 *   ProtocolVersion client_version;
	 *   opaque random[46];
	 * } PreMasterSecret;
	 *
	 * struct {
	 *   public-key-encrypted PreMasterSecret pre_master_secret;
	 * } EncryptedPreMasterSecret;
	 */

	/*
	 * Note: To avoid Bleichenbacher attack, we do not report decryption or
	 * parsing errors from EncryptedPreMasterSecret processing to the
	 * client. Instead, a random pre-master secret is used to force the
	 * handshake to fail.
	 */

	if (crypto_private_key_decrypt_pkcs1_v15(conn->cred->key,
						 pos, end - pos,
						 out, &outlen) < 0) {
		wpa_printf(MSG_DEBUG, "TLSv1: Failed to decrypt "
			   "PreMasterSecret (encr_len=%d outlen=%lu)",
			   end - pos, (unsigned long) outlen);
		use_random = 1;
	}

	if (outlen != TLS_PRE_MASTER_SECRET_LEN) {
		wpa_printf(MSG_DEBUG, "TLSv1: Unexpected PreMasterSecret "
			   "length %lu", (unsigned long) outlen);
		use_random = 1;
	}

	if (WPA_GET_BE16(out) != conn->client_version) {
		wpa_printf(MSG_DEBUG, "TLSv1: Client version in "
			   "ClientKeyExchange does not match with version in "
			   "ClientHello");
		use_random = 1;
	}

	if (use_random) {
		wpa_printf(MSG_DEBUG, "TLSv1: Using random premaster secret "
			   "to avoid revealing information about private key");
		outlen = TLS_PRE_MASTER_SECRET_LEN;
		if (os_get_random(out, outlen)) {
			wpa_printf(MSG_DEBUG, "TLSv1: Failed to get random "
				   "data");
			tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
					   TLS_ALERT_INTERNAL_ERROR);
			os_free(out);
			return -1;
		}
	}

	res = tlsv1_server_derive_keys(conn, out, outlen);

	/* Clear the pre-master secret since it is not needed anymore */
	os_memset(out, 0, outbuflen);
	os_free(out);

	if (res) {
		wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive keys");
		tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
				   TLS_ALERT_INTERNAL_ERROR);
		return -1;
	}

	return 0;
}


static int tls_process_client_key_exchange_dh_anon(
	struct tlsv1_server *conn, const u8 *pos, const u8 *end)