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Add specific SSL error code for unexpected CIDs

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Currently, the stack silently ignores DTLS frames with an unexpected CID.
However, in a system which performs CID-based demultiplexing before passing
datagrams to the Mbed TLS stack, unexpected CIDs are a sign of something not
working properly, and users might want to know about it.

This commit introduces an SSL error code MBEDTLS_ERR_SSL_UNEXPECTED_CID
which the stack can return in response to an unexpected CID. It will
conditionally be put to use in subsequent commits.
This commit is contained in:
Hanno Becker 2019-05-14 11:02:36 +01:00
parent 7842609e3b
commit 7c3cdb62de
3 changed files with 5 additions and 2 deletions
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4
include/mbedtls/error.h
View File

@ -100,8 +100,8 @@
* ECP 4 10 (Started from top)
* MD 5 5
* HKDF 5 1 (Started from top)
* CIPHER 6 8
* SSL 6 23 (Started from top)
* CIPHER 6 8 (Started from 0x6080)
* SSL 6 24 (Started from top, plus 0x6000)
* SSL 7 32
*
* Module dependent error code (5 bits 0x.00.-0x.F8.)

1
include/mbedtls/ssl.h
View File

@ -122,6 +122,7 @@
#define MBEDTLS_ERR_SSL_CONTINUE_PROCESSING -0x6580 /**< Internal-only message signaling that further message-processing should be done */
#define MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS -0x6500 /**< The asynchronous operation is not completed yet. */
#define MBEDTLS_ERR_SSL_EARLY_MESSAGE -0x6480 /**< Internal-only message signaling that a message arrived early. */
#define MBEDTLS_ERR_SSL_UNEXPECTED_CID -0x6000 /**< An encrypted DTLS-frame with an unexpected CID was received. */
#define MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS -0x7000 /**< A cryptographic operation is in progress. Try again later. */
/*

2
library/error.c
View File

@ -523,6 +523,8 @@ void mbedtls_strerror( int ret, char *buf, size_t buflen )
mbedtls_snprintf( buf, buflen, "SSL - The asynchronous operation is not completed yet" );
if( use_ret == -(MBEDTLS_ERR_SSL_EARLY_MESSAGE) )
mbedtls_snprintf( buf, buflen, "SSL - Internal-only message signaling that a message arrived early" );
if( use_ret == -(MBEDTLS_ERR_SSL_UNEXPECTED_CID) )
mbedtls_snprintf( buf, buflen, "SSL - An encrypted DTLS-frame with an unexpected CID was received" );
if( use_ret == -(MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS) )
mbedtls_snprintf( buf, buflen, "SSL - A cryptographic operation is in progress. Try again later" );
#endif /* MBEDTLS_SSL_TLS_C */