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Add compile-time checks for size of record content and payload

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This commit is contained in:
Hanno Becker 2017-09-18 10:54:39 +01:00
parent 01692531c6
commit a8434e8f95
1 changed files with 24 additions and 5 deletions
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29
include/mbedtls/ssl_internal.h
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@ -24,6 +24,7 @@
#define MBEDTLS_SSL_INTERNAL_H
#include "ssl.h"
#include "cipher.h"
#if defined(MBEDTLS_MD5_C)
#include "md5.h"
@ -138,13 +139,31 @@
#define MBEDTLS_SSL_PADDING_ADD 0
#endif
#define MBEDTLS_SSL_BUFFER_LEN ( MBEDTLS_SSL_MAX_CONTENT_LEN \
+ MBEDTLS_SSL_COMPRESSION_ADD \
+ 29 /* counter + header + IV */ \
+ MBEDTLS_SSL_MAC_ADD \
+ MBEDTLS_SSL_PADDING_ADD \
#define MBEDTLS_SSL_PAYLOAD_LEN ( MBEDTLS_SSL_MAX_CONTENT_LEN \
+ MBEDTLS_SSL_COMPRESSION_ADD \
+ MBEDTLS_MAX_IV_LENGTH \
+ MBEDTLS_SSL_MAC_ADD \
+ MBEDTLS_SSL_PADDING_ADD \
)
/*
* Check that we obey the standard's message size bounds
*/
#if MBEDTLS_SSL_MAX_CONTENT_LEN > 16384
#error Bad configuration - record content too large.
#endif
#if MBEDTLS_SSL_PAYLOAD_LEN > 16384 + 2048
#error Bad configuration - protected record payload too large.
#endif
#define MBEDTLS_SSL_BUFFER_LEN ( MBEDTLS_SSL_PAYLOAD_LEN \
+ 5 /* TLS record header */ \
+ 8 /* Additional DTLS fields */ \
)
/*
* TLS extension flags (for extensions with outgoing ServerHello content
* that need it (e.g. for RENEGOTIATION_INFO the server already knows because