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[tls] Support TLS version 1.1 

Advertise support for TLS version 1.1, and be prepared to downgrade to
TLS version 1.0.  Tested against Apache with mod_gnutls, using the
GnuTLSPriorities directive to force specific protocol versions.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/6/head
Michael Brown 2012-03-03 14:11:46 +00:00
parent d620606d3e
commit d9ce3bfe4c
2 changed files with 30 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/include/ipxe/tls.h
View File

@ -138,6 +138,8 @@ struct tls_session {
/** Ciphertext stream */
struct interface cipherstream;
/** Protocol version */
uint16_t version;
/** Current TX cipher specification */
struct tls_cipherspec tx_cipherspec;
/** Next TX cipher specification */

44
src/net/tls.c
View File

@ -697,7 +697,7 @@ static int tls_send_client_hello ( struct tls_session *tls ) {
hello.type_length = ( cpu_to_le32 ( TLS_CLIENT_HELLO ) |
htonl ( sizeof ( hello ) -
sizeof ( hello.type_length ) ) );
hello.version = htons ( TLS_VERSION_TLS_1_0 );
hello.version = htons ( tls->version );
memcpy ( &hello.random, &tls->client_random, sizeof ( hello.random ) );
hello.cipher_suite_len = htons ( sizeof ( hello.cipher_suites ) );
hello.cipher_suites[0] = htons ( TLS_RSA_WITH_AES_128_CBC_SHA );
@ -877,6 +877,7 @@ static int tls_new_server_hello ( struct tls_session *tls,
char next[0];
} __attribute__ (( packed )) *hello_b = ( void * ) &hello_a->next;
void *end = hello_b->next;
uint16_t version;
int rc;
/* Sanity check */
@ -886,13 +887,22 @@ static int tls_new_server_hello ( struct tls_session *tls,
return -EINVAL;
}
/* Check protocol version */
if ( ntohs ( hello_a->version ) < TLS_VERSION_TLS_1_0 ) {
/* Check and store protocol version */
version = ntohs ( hello_a->version );
if ( version < TLS_VERSION_TLS_1_0 ) {
DBGC ( tls, "TLS %p does not support protocol version %d.%d\n",
tls, ( ntohs ( hello_a->version ) >> 8 ),
( ntohs ( hello_a->version ) & 0xff ) );
tls, ( version >> 8 ), ( version & 0xff ) );
return -ENOTSUP;
}
if ( version > tls->version ) {
DBGC ( tls, "TLS %p server attempted to illegally upgrade to "
"protocol version %d.%d\n",
tls, ( version >> 8 ), ( version & 0xff ) );
return -EPROTO;
}
tls->version = version;
DBGC ( tls, "TLS %p using protocol version %d.%d\n",
tls, ( version >> 8 ), ( version & 0xff ) );
/* Copy out server random bytes */
memcpy ( &tls->server_random, &hello_a->random,
@ -1208,8 +1218,8 @@ static void * tls_assemble_block ( struct tls_session *tls,
const void *data, size_t len,
void *digest, size_t *plaintext_len ) {
size_t blocksize = tls->tx_cipherspec.cipher->blocksize;
size_t iv_len = blocksize;
size_t mac_len = tls->tx_cipherspec.digest->digestsize;
size_t iv_len;
size_t padding_len;
void *plaintext;
void *iv;
@ -1217,8 +1227,8 @@ static void * tls_assemble_block ( struct tls_session *tls,
void *mac;
void *padding;
/* FIXME: TLSv1.1 has an explicit IV */
iv_len = 0;
/* TLSv1.1 and later use an explicit IV */
iv_len = ( ( tls->version >= TLS_VERSION_TLS_1_1 ) ? blocksize : 0 );
/* Calculate block-ciphered struct length */
padding_len = ( ( blocksize - 1 ) & -( iv_len + len + mac_len + 1 ) );
@ -1234,7 +1244,7 @@ static void * tls_assemble_block ( struct tls_session *tls,
padding = ( mac + mac_len );
/* Fill in block-ciphered struct */
memset ( iv, 0, iv_len );
tls_generate_random ( tls, iv, iv_len );
memcpy ( content, data, len );
memcpy ( mac, digest, mac_len );
memset ( padding, padding_len, ( padding_len + 1 ) );
@ -1266,7 +1276,7 @@ static int tls_send_plaintext ( struct tls_session *tls, unsigned int type,
/* Construct header */
plaintext_tlshdr.type = type;
plaintext_tlshdr.version = htons ( TLS_VERSION_TLS_1_0 );
plaintext_tlshdr.version = htons ( tls->version );
plaintext_tlshdr.length = htons ( len );
/* Calculate MAC */
@ -1304,7 +1314,7 @@ static int tls_send_plaintext ( struct tls_session *tls, unsigned int type,
/* Assemble ciphertext */
tlshdr = iob_put ( ciphertext, sizeof ( *tlshdr ) );
tlshdr->type = type;
tlshdr->version = htons ( TLS_VERSION_TLS_1_0 );
tlshdr->version = htons ( tls->version );
tlshdr->length = htons ( plaintext_len );
memcpy ( cipherspec->cipher_next_ctx, cipherspec->cipher_ctx,
cipherspec->cipher->ctxsize );
@ -1399,17 +1409,18 @@ static int tls_split_block ( struct tls_session *tls,
size_t padding_len;
unsigned int i;
/* Decompose block-ciphered data */
/* Sanity check */
if ( plaintext_len < 1 ) {
DBGC ( tls, "TLS %p received underlength record\n", tls );
DBGC_HD ( tls, plaintext, plaintext_len );
return -EINVAL;
}
iv_len = tls->rx_cipherspec.cipher->blocksize;
/* FIXME: TLSv1.1 uses an explicit IV */
iv_len = 0;
/* TLSv1.1 and later use an explicit IV */
iv_len = ( ( tls->version >= TLS_VERSION_TLS_1_1 ) ?
tls->rx_cipherspec.cipher->blocksize : 0 );
/* Decompose block-ciphered data */
mac_len = tls->rx_cipherspec.digest->digestsize;
padding_len = *( ( uint8_t * ) ( plaintext + plaintext_len - 1 ) );
if ( plaintext_len < ( iv_len + mac_len + padding_len + 1 ) ) {
@ -1808,6 +1819,7 @@ int add_tls ( struct interface *xfer, struct interface **next ) {
ref_init ( &tls->refcnt, free_tls );
intf_init ( &tls->plainstream, &tls_plainstream_desc, &tls->refcnt );
intf_init ( &tls->cipherstream, &tls_cipherstream_desc, &tls->refcnt );
tls->version = TLS_VERSION_TLS_1_1;
tls_clear_cipher ( tls, &tls->tx_cipherspec );
tls_clear_cipher ( tls, &tls->tx_cipherspec_pending );
tls_clear_cipher ( tls, &tls->rx_cipherspec );
@ -1817,7 +1829,7 @@ int add_tls ( struct interface *xfer, struct interface **next ) {
( sizeof ( tls->client_random.random ) ) ) ) != 0 ) {
goto err_random;
}
tls->pre_master_secret.version = htons ( TLS_VERSION_TLS_1_0 );
tls->pre_master_secret.version = htons ( tls->version );
if ( ( rc = tls_generate_random ( tls, &tls->pre_master_secret.random,
( sizeof ( tls->pre_master_secret.random ) ) ) ) != 0 ) {
goto err_random;