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TLS 1.3: Implement TLSInnerPlaintext parsing/building

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Signed-off-by: Hanno Becker <hanno.becker@arm.com>
This commit is contained in:
Hanno Becker 2020-05-04 12:30:04 +01:00
parent 7d343ecf06
commit ccc13d03c3
1 changed files with 38 additions and 2 deletions
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40
library/ssl_msg.c
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@ -341,7 +341,8 @@ static void ssl_read_memory( unsigned char *p, size_t len )
* Encryption/decryption functions
*/
#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) || \
defined(MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL)
/* This functions transforms a (D)TLS plaintext fragment and a record content
* type into an instance of the (D)TLSInnerPlaintext structure. This is used
* in DTLS 1.2 + CID and within TLS 1.3 to allow flexible padding and to protect
@ -418,7 +419,8 @@ static int ssl_parse_inner_plaintext( unsigned char const *content,
return( 0 );
}
#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID ||
MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */
/* `add_data` must have size 13 Bytes if the CID extension is disabled,
* and 13 + 1 + CID-length Bytes if the CID extension is enabled. */
@ -576,6 +578,28 @@ int mbedtls_ssl_encrypt_buf( mbedtls_ssl_context *ssl,
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
#if defined(MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL)
if( transform->minor_ver == MBEDTLS_SSL_MINOR_VERSION_4 )
{
/*
* Wrap plaintext into TLSInnerPlaintext structure.
* See ssl_build_inner_plaintext() for more information.
*
* Note that this changes `rec->data_len`, and hence
* `post_avail` needs to be recalculated afterwards.
*/
if( ssl_build_inner_plaintext( data,
&rec->data_len,
post_avail,
rec->type ) != 0 )
{
return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
}
rec->type = MBEDTLS_SSL_MSG_APPLICATION_DATA;
}
#endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */
#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
/*
* Add CID information
@ -1551,6 +1575,18 @@ int mbedtls_ssl_decrypt_buf( mbedtls_ssl_context const *ssl,
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
}
#if defined(MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL)
if( transform->minor_ver == MBEDTLS_SSL_MINOR_VERSION_4 )
{
/* Remove inner padding and infer true content type. */
ret = ssl_parse_inner_plaintext( data, &rec->data_len,
&rec->type );
if( ret != 0 )
return( MBEDTLS_ERR_SSL_INVALID_RECORD );
}
#endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */
#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
if( rec->cid_len != 0 )
{