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Update iv and len context pointers manually when reallocating buffers

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These fields might be shifted accordingly in `ssl_parse_record_header()`
when receiving a connection with CID, so they require a manual update
after calling the generic `mbedtls_ssl_reset_in_out_pointers()`.

This commit also adds a regression test which is run by all.sh.

Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
This commit is contained in:
Andrzej Kurek 2020-06-08 07:08:03 -04:00
parent 21b3d12066
commit b657783269
No known key found for this signature in database
GPG Key ID: 89A90840DC388527
3 changed files with 55 additions and 7 deletions
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5
ChangeLog.d/bugfix_PR3405 Normal file
View File

@ -0,0 +1,5 @@
Bugfix
* Update iv and len context pointers manually when reallocating buffers
using the MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH feature. This caused issues
when receiving a connection with CID, when these fields were shifted
in ssl_parse_record_header().

31
library/ssl_tls.c
View File

@ -3686,11 +3686,13 @@ static int ssl_handshake_init( mbedtls_ssl_context *ssl )
/* If the buffers are too small - reallocate */
{
int modified = 0;
size_t written_in = 0;
size_t written_out = 0;
size_t written_in = 0, iv_offset_in = 0, len_offset_in = 0;
size_t written_out = 0, iv_offset_out = 0, len_offset_out = 0;
if( ssl->in_buf != NULL )
{
written_in = ssl->in_msg - ssl->in_buf;
iv_offset_in = ssl->in_iv - ssl->in_buf;
len_offset_in = ssl->in_len - ssl->in_buf;
if( ssl->in_buf_len < MBEDTLS_SSL_IN_BUFFER_LEN )
{
if( resize_buffer( &ssl->in_buf, MBEDTLS_SSL_IN_BUFFER_LEN,
@ -3709,6 +3711,8 @@ static int ssl_handshake_init( mbedtls_ssl_context *ssl )
if( ssl->out_buf != NULL )
{
written_out = ssl->out_msg - ssl->out_buf;
iv_offset_out = ssl->out_iv - ssl->out_buf;
len_offset_out = ssl->out_len - ssl->out_buf;
if( ssl->out_buf_len < MBEDTLS_SSL_OUT_BUFFER_LEN )
{
if( resize_buffer( &ssl->out_buf, MBEDTLS_SSL_OUT_BUFFER_LEN,
@ -3728,9 +3732,14 @@ static int ssl_handshake_init( mbedtls_ssl_context *ssl )
/* Update pointers here to avoid doing it twice. */
mbedtls_ssl_reset_in_out_pointers( ssl );
/* Fields below might not be properly updated with record
* splitting, so they are manually updated here. */
* splitting or with CID, so they are manually updated here. */
ssl->out_msg = ssl->out_buf + written_out;
ssl->out_len = ssl->out_buf + len_offset_out;
ssl->out_iv = ssl->out_buf + iv_offset_out;
ssl->in_msg = ssl->in_buf + written_in;
ssl->in_len = ssl->in_buf + len_offset_in;
ssl->in_iv = ssl->in_buf + iv_offset_in;
}
}
#endif
@ -5960,14 +5969,15 @@ void mbedtls_ssl_handshake_free( mbedtls_ssl_context *ssl )
{
int modified = 0;
uint32_t buf_len = mbedtls_ssl_get_input_buflen( ssl );
size_t written_in = 0;
size_t written_out = 0;
size_t written_in = 0, iv_offset_in = 0, len_offset_in = 0;
size_t written_out = 0, iv_offset_out = 0, len_offset_out = 0;
if( ssl->in_buf != NULL )
{
written_in = ssl->in_msg - ssl->in_buf;
iv_offset_in = ssl->in_iv - ssl->in_buf;
len_offset_in = ssl->in_len - ssl->in_buf;
if( ssl->in_buf_len > buf_len && ssl->in_left < buf_len )
{
written_in = ssl->in_msg - ssl->in_buf;
if( resize_buffer( &ssl->in_buf, buf_len, &ssl->in_buf_len ) != 0 )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "input buffer resizing failed - out of memory" ) );
@ -5985,6 +5995,8 @@ void mbedtls_ssl_handshake_free( mbedtls_ssl_context *ssl )
if(ssl->out_buf != NULL )
{
written_out = ssl->out_msg - ssl->out_buf;
iv_offset_out = ssl->out_iv - ssl->out_buf;
len_offset_out = ssl->out_len - ssl->out_buf;
if( ssl->out_buf_len > mbedtls_ssl_get_output_buflen( ssl ) &&
ssl->out_left < buf_len )
{
@ -6004,9 +6016,14 @@ void mbedtls_ssl_handshake_free( mbedtls_ssl_context *ssl )
/* Update pointers here to avoid doing it twice. */
mbedtls_ssl_reset_in_out_pointers( ssl );
/* Fields below might not be properly updated with record
* splitting, so they are manually updated here. */
* splitting or with CID, so they are manually updated here. */
ssl->out_msg = ssl->out_buf + written_out;
ssl->out_len = ssl->out_buf + len_offset_out;
ssl->out_iv = ssl->out_buf + iv_offset_out;
ssl->in_msg = ssl->in_buf + written_in;
ssl->in_len = ssl->in_buf + len_offset_in;
ssl->in_iv = ssl->in_buf + iv_offset_in;
}
}
#endif

26
tests/ssl-opt.sh
View File

@ -2201,6 +2201,32 @@ run_test "Connection ID, 3D: Cli+Srv enabled, Srv disables on renegotiation"
-c "ignoring unexpected CID" \
-s "ignoring unexpected CID"
requires_config_enabled MBEDTLS_SSL_DTLS_CONNECTION_ID
requires_config_enabled MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH
run_test "Connection ID: Cli+Srv enabled, variable buffer lengths, MFL=512" \
"$P_SRV dtls=1 cid=1 cid_val=dead debug_level=2" \
"$P_CLI force_ciphersuite="TLS-ECDHE-ECDSA-WITH-AES-128-CCM-8" max_frag_len=512 dtls=1 cid=1 cid_val=beef" \
0 \
-c "(initial handshake) Peer CID (length 2 Bytes): de ad" \
-s "(initial handshake) Peer CID (length 2 Bytes): be ef" \
-s "(initial handshake) Use of Connection ID has been negotiated" \
-c "(initial handshake) Use of Connection ID has been negotiated" \
-s "Reallocating in_buf" \
-s "Reallocating out_buf"
requires_config_enabled MBEDTLS_SSL_DTLS_CONNECTION_ID
requires_config_enabled MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH
run_test "Connection ID: Cli+Srv enabled, variable buffer lengths, MFL=1024" \
"$P_SRV dtls=1 cid=1 cid_val=dead debug_level=2" \
"$P_CLI force_ciphersuite="TLS-ECDHE-ECDSA-WITH-AES-128-CCM-8" max_frag_len=1024 dtls=1 cid=1 cid_val=beef" \
0 \
-c "(initial handshake) Peer CID (length 2 Bytes): de ad" \
-s "(initial handshake) Peer CID (length 2 Bytes): be ef" \
-s "(initial handshake) Use of Connection ID has been negotiated" \
-c "(initial handshake) Use of Connection ID has been negotiated" \
-s "Reallocating in_buf" \
-s "Reallocating out_buf"
# Tests for Encrypt-then-MAC extension
run_test "Encrypt then MAC: default" \