TLS: Add support for TLS v1.1 (RFC 4346) with internal TLS
This is disabled by defautl and can be enabled with CONFIG_TLSV11=y build configuration parameter.
This commit is contained in:
Jouni Malinen
parent
3bff59f857
commit
5c47af9a7a
13 changed files with 157 additions and 32 deletions
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@ -434,6 +434,10 @@ ifndef CONFIG_TLS
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CONFIG_TLS=openssl
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endif
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ifdef CONFIG_TLSV11
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CFLAGS += -DCONFIG_TLSV11
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endif
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ifeq ($(CONFIG_TLS), openssl)
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ifdef TLS_FUNCS
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OBJS += ../src/crypto/tls_openssl.o
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@ -208,3 +208,39 @@ CONFIG_IPV6=y
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# considered for builds that are known to be used on devices that meet the
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# requirements described above.
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#CONFIG_NO_RANDOM_POOL=y
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# Select TLS implementation
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# openssl = OpenSSL (default)
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# gnutls = GnuTLS (needed for TLS/IA, see also CONFIG_GNUTLS_EXTRA)
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# internal = Internal TLSv1 implementation (experimental)
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# none = Empty template
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#CONFIG_TLS=openssl
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# Whether to enable TLS/IA support, which is required for EAP-TTLSv1.
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# You need CONFIG_TLS=gnutls for this to have any effect. Please note that
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# even though the core GnuTLS library is released under LGPL, this extra
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# library uses GPL and as such, the terms of GPL apply to the combination
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# of wpa_supplicant and GnuTLS if this option is enabled. BSD license may not
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# apply for distribution of the resulting binary.
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#CONFIG_GNUTLS_EXTRA=y
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# TLS-based EAP methods require at least TLS v1.0. Newer version of TLS (v1.1)
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# can be enabled to get a stronger construction of messages when block ciphers
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# are used.
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#CONFIG_TLSV11=y
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# If CONFIG_TLS=internal is used, additional library and include paths are
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# needed for LibTomMath. Alternatively, an integrated, minimal version of
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# LibTomMath can be used. See beginning of libtommath.c for details on benefits
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# and drawbacks of this option.
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#CONFIG_INTERNAL_LIBTOMMATH=y
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#ifndef CONFIG_INTERNAL_LIBTOMMATH
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#LTM_PATH=/usr/src/libtommath-0.39
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#CFLAGS += -I$(LTM_PATH)
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#LIBS += -L$(LTM_PATH)
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#LIBS_p += -L$(LTM_PATH)
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#endif
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# At the cost of about 4 kB of additional binary size, the internal LibTomMath
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# can be configured to include faster routines for exptmod, sqr, and div to
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# speed up DH and RSA calculation considerably
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#CONFIG_INTERNAL_LIBTOMMATH_FAST=y
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@ -1,5 +1,5 @@
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/*
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* TLSv1 client (RFC 2246)
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* TLS v1.0 (RFC 2246) and v1.1 (RFC 4346) client
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* Copyright (c) 2006-2011, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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@ -80,8 +80,9 @@ int tls_derive_keys(struct tlsv1_client *conn,
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os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
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os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random, TLS_RANDOM_LEN);
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key_block_len = 2 * (conn->rl.hash_size + conn->rl.key_material_len +
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conn->rl.iv_size);
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key_block_len = 2 * (conn->rl.hash_size + conn->rl.key_material_len);
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if (conn->rl.tls_version == TLS_VERSION_1)
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key_block_len += 2 * conn->rl.iv_size;
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if (tls_prf(conn->master_secret, TLS_MASTER_SECRET_LEN,
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"key expansion", seed, 2 * TLS_RANDOM_LEN,
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key_block, key_block_len)) {
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@ -107,12 +108,21 @@ int tls_derive_keys(struct tlsv1_client *conn,
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os_memcpy(conn->rl.read_key, pos, conn->rl.key_material_len);
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pos += conn->rl.key_material_len;
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if (conn->rl.tls_version == TLS_VERSION_1) {
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/* client_write_IV */
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os_memcpy(conn->rl.write_iv, pos, conn->rl.iv_size);
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pos += conn->rl.iv_size;
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/* server_write_IV */
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os_memcpy(conn->rl.read_iv, pos, conn->rl.iv_size);
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pos += conn->rl.iv_size;
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} else {
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/*
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* Use IV field to set the mask value for TLS v1.1. A fixed
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* mask of zero is used per the RFC 4346, 6.2.3.2 CBC Block
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* Cipher option 2a.
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*/
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os_memset(conn->rl.write_iv, 0, conn->rl.iv_size);
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}
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return 0;
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}
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@ -358,6 +368,8 @@ struct tlsv1_client * tlsv1_client_init(void)
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suites[count++] = TLS_RSA_WITH_RC4_128_MD5;
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conn->num_cipher_suites = count;
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conn->rl.tls_version = TLS_VERSION;
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return conn;
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}
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@ -1,6 +1,6 @@
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/*
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* TLSv1 client - read handshake message
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* Copyright (c) 2006-2007, Jouni Malinen <j@w1.fi>
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* TLS v1.0 (RFC 2246) and v1.1 (RFC 4346) client - read handshake message
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* Copyright (c) 2006-2011, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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@ -38,6 +38,7 @@ static int tls_process_server_hello(struct tlsv1_client *conn, u8 ct,
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const u8 *pos, *end;
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size_t left, len, i;
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u16 cipher_suite;
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u16 tls_version;
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if (ct != TLS_CONTENT_TYPE_HANDSHAKE) {
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wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; "
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@ -79,15 +80,22 @@ static int tls_process_server_hello(struct tlsv1_client *conn, u8 ct,
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/* ProtocolVersion server_version */
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if (end - pos < 2)
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goto decode_error;
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if (WPA_GET_BE16(pos) != TLS_VERSION) {
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tls_version = WPA_GET_BE16(pos);
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if (tls_version != TLS_VERSION_1 &&
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(tls_version != TLS_VERSION_1_1 ||
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TLS_VERSION == TLS_VERSION_1)) {
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wpa_printf(MSG_DEBUG, "TLSv1: Unexpected protocol version in "
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"ServerHello");
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"ServerHello %u.%u", pos[0], pos[1]);
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tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
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TLS_ALERT_PROTOCOL_VERSION);
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return -1;
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}
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pos += 2;
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wpa_printf(MSG_DEBUG, "TLSv1: Using TLS v%s",
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tls_version == TLS_VERSION_1_1 ? "1.1" : "1.0");
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conn->rl.tls_version = tls_version;
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/* Random random */
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if (end - pos < TLS_RANDOM_LEN)
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goto decode_error;
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@ -1,5 +1,5 @@
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/*
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* TLSv1 client - write handshake message
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* TLS v1.0 (RFC 2246) and v1.1 (RFC 4346) client - write handshake message
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* Copyright (c) 2006-2011, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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@ -774,7 +774,8 @@ u8 * tlsv1_client_send_alert(struct tlsv1_client *conn, u8 level,
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/* ContentType type */
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*pos++ = TLS_CONTENT_TYPE_ALERT;
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/* ProtocolVersion version */
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WPA_PUT_BE16(pos, TLS_VERSION);
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WPA_PUT_BE16(pos, conn->rl.tls_version ? conn->rl.tls_version :
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TLS_VERSION);
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pos += 2;
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/* uint16 length (to be filled) */
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length = pos;
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@ -1,6 +1,6 @@
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/*
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* TLSv1 common definitions
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* Copyright (c) 2006-2007, Jouni Malinen <j@w1.fi>
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* TLS v1.0 (RFC 2246) and v1.1 (RFC 4346) common definitions
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* Copyright (c) 2006-2011, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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@ -17,7 +17,13 @@
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#include "crypto/crypto.h"
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#define TLS_VERSION 0x0301 /* TLSv1 */
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#define TLS_VERSION_1 0x0301 /* TLSv1 */
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#define TLS_VERSION_1_1 0x0302 /* TLSv1.1 */
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#ifdef CONFIG_TLSV11
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#define TLS_VERSION TLS_VERSION_1_1
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#else /* CONFIG_TLSV11 */
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#define TLS_VERSION TLS_VERSION_1
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#endif /* CONFIG_TLSV11 */
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#define TLS_RANDOM_LEN 32
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#define TLS_PRE_MASTER_SECRET_LEN 48
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#define TLS_MASTER_SECRET_LEN 48
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@ -1,5 +1,5 @@
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/*
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* TLSv1 Record Protocol
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* TLS v1.0 (RFC 2246) and v1.1 (RFC 4346) Record Protocol
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* Copyright (c) 2006-2011, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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@ -139,7 +139,7 @@ int tlsv1_record_change_read_cipher(struct tlsv1_record_layer *rl)
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* @rl: Pointer to TLS record layer data
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* @content_type: Content type (TLS_CONTENT_TYPE_*)
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* @buf: Buffer for the generated TLS message (needs to have extra space for
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* header and HMAC)
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* header, IV (TLS v1.1), and HMAC)
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* @buf_size: Maximum buf size
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* @payload: Payload to be sent
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* @payload_len: Length of the payload
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@ -156,6 +156,7 @@ int tlsv1_record_send(struct tlsv1_record_layer *rl, u8 content_type, u8 *buf,
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u8 *pos, *ct_start, *length, *cpayload;
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struct crypto_hash *hmac;
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size_t clen;
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int explicit_iv;
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pos = buf;
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if (pos + TLS_RECORD_HEADER_LEN > buf + buf_size)
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@ -165,7 +166,7 @@ int tlsv1_record_send(struct tlsv1_record_layer *rl, u8 content_type, u8 *buf,
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ct_start = pos;
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*pos++ = content_type;
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/* ProtocolVersion version */
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WPA_PUT_BE16(pos, TLS_VERSION);
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WPA_PUT_BE16(pos, rl->tls_version);
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pos += 2;
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/* uint16 length */
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length = pos;
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@ -173,6 +174,22 @@ int tlsv1_record_send(struct tlsv1_record_layer *rl, u8 content_type, u8 *buf,
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pos += 2;
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cpayload = pos;
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explicit_iv = rl->write_cipher_suite != TLS_NULL_WITH_NULL_NULL &&
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rl->iv_size && rl->tls_version == TLS_VERSION_1_1;
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if (explicit_iv) {
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/* opaque IV[Cipherspec.block_length] */
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if (pos + rl->iv_size > buf + buf_size)
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return -1;
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/*
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* Use random number R per the RFC 4346, 6.2.3.2 CBC Block
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* Cipher option 2a.
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*/
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if (os_get_random(pos, rl->iv_size))
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return -1;
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pos += rl->iv_size;
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}
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/*
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* opaque fragment[TLSPlaintext.length]
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@ -343,6 +360,9 @@ int tlsv1_record_receive(struct tlsv1_record_layer *rl,
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return -1;
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}
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plen = in_len;
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wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: Record Layer - Decrypted "
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"data", out_data, plen);
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if (rl->iv_size) {
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/*
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* TLS v1.0 defines different alert values for various
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@ -355,6 +375,19 @@ int tlsv1_record_receive(struct tlsv1_record_layer *rl,
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* attacks more difficult.
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*/
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if (rl->tls_version == TLS_VERSION_1_1) {
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/* Remove opaque IV[Cipherspec.block_length] */
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if (plen < rl->iv_size) {
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wpa_printf(MSG_DEBUG, "TLSv1.1: Not "
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"enough room for IV");
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force_mac_error = 1;
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goto check_mac;
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}
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os_memmove(out_data, out_data + rl->iv_size,
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plen - rl->iv_size);
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plen -= rl->iv_size;
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}
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/* Verify and remove padding */
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if (plen == 0) {
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wpa_printf(MSG_DEBUG, "TLSv1: Too short record"
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@ -387,8 +420,8 @@ int tlsv1_record_receive(struct tlsv1_record_layer *rl,
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}
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check_mac:
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wpa_hexdump(MSG_MSGDUMP,
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"TLSv1: Record Layer - Decrypted data",
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wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: Record Layer - Decrypted "
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"data with IV and padding removed",
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out_data, plen);
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if (plen < rl->hash_size) {
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@ -1,6 +1,6 @@
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/*
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* TLSv1 Record Protocol
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* Copyright (c) 2006-2007, Jouni Malinen <j@w1.fi>
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* TLS v1.0 (RFC 2246) and v1.1 (RFC 4346) Record Protocol
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* Copyright (c) 2006-2011, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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@ -35,6 +35,8 @@ enum {
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};
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struct tlsv1_record_layer {
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u16 tls_version;
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u8 write_mac_secret[TLS_MAX_WRITE_MAC_SECRET_LEN];
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u8 read_mac_secret[TLS_MAX_WRITE_MAC_SECRET_LEN];
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u8 write_key[TLS_MAX_WRITE_KEY_LEN];
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@ -1,5 +1,5 @@
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/*
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* TLSv1 server (RFC 2246)
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* TLS v1.0 (RFC 2246) and v1.1 (RFC 4346) server
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* Copyright (c) 2006-2011, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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@ -85,15 +85,26 @@ static int tls_process_client_hello(struct tlsv1_server *conn, u8 ct,
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conn->client_version = WPA_GET_BE16(pos);
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wpa_printf(MSG_DEBUG, "TLSv1: Client version %d.%d",
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conn->client_version >> 8, conn->client_version & 0xff);
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if (conn->client_version < TLS_VERSION) {
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if (conn->client_version < TLS_VERSION_1) {
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wpa_printf(MSG_DEBUG, "TLSv1: Unexpected protocol version in "
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"ClientHello");
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"ClientHello %u.%u",
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conn->client_version >> 8,
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conn->client_version & 0xff);
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tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
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TLS_ALERT_PROTOCOL_VERSION);
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return -1;
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}
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pos += 2;
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if (TLS_VERSION == TLS_VERSION_1)
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conn->rl.tls_version = TLS_VERSION_1;
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else if (conn->client_version > TLS_VERSION_1_1)
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conn->rl.tls_version = TLS_VERSION_1_1;
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else
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conn->rl.tls_version = conn->client_version;
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wpa_printf(MSG_DEBUG, "TLSv1: Using TLS v%s",
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conn->rl.tls_version == TLS_VERSION_1_1 ? "1.1" : "1.0");
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/* Random random */
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if (end - pos < TLS_RANDOM_LEN)
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goto decode_error;
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@ -1,5 +1,5 @@
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/*
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* TLSv1 server - write handshake message
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* TLS v1.0 (RFC 2246) and v1.1 (RFC 4346) server - write handshake message
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* Copyright (c) 2006-2011, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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@ -87,7 +87,7 @@ static int tls_write_server_hello(struct tlsv1_server *conn,
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pos += 3;
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/* body - ServerHello */
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/* ProtocolVersion server_version */
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WPA_PUT_BE16(pos, TLS_VERSION);
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WPA_PUT_BE16(pos, conn->rl.tls_version);
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pos += 2;
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/* Random random: uint32 gmt_unix_time, opaque random_bytes */
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os_memcpy(pos, conn->server_random, TLS_RANDOM_LEN);
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@ -764,7 +764,8 @@ u8 * tlsv1_server_send_alert(struct tlsv1_server *conn, u8 level,
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/* ContentType type */
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*pos++ = TLS_CONTENT_TYPE_ALERT;
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/* ProtocolVersion version */
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WPA_PUT_BE16(pos, TLS_VERSION);
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WPA_PUT_BE16(pos, conn->rl.tls_version ? conn->rl.tls_version :
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TLS_VERSION);
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pos += 2;
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/* uint16 length (to be filled) */
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length = pos;
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@ -806,6 +806,10 @@ ifndef CONFIG_TLS
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CONFIG_TLS=openssl
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endif
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ifdef CONFIG_TLSV11
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CFLAGS += -DCONFIG_TLSV11
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endif
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ifeq ($(CONFIG_TLS), openssl)
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ifdef TLS_FUNCS
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CFLAGS += -DEAP_TLS_OPENSSL
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@ -335,6 +335,13 @@ CONFIG_PEERKEY=y
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# apply for distribution of the resulting binary.
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#CONFIG_GNUTLS_EXTRA=y
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# TLS-based EAP methods require at least TLS v1.0. Newer version of TLS (v1.1)
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# can be enabled to get a stronger construction of messages when block ciphers
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# are used. It should be noted that some existing TLS v1.0 -based
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# implementation may not be compatible with TLS v1.1 message (ClientHello is
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# sent prior to negotiating which version will be used)
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#CONFIG_TLSV11=y
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# If CONFIG_TLS=internal is used, additional library and include paths are
|
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# needed for LibTomMath. Alternatively, an integrated, minimal version of
|
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# LibTomMath can be used. See beginning of libtommath.c for details on benefits
|
||||
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Reference in a new issue