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Catch failures of md_hmac operations

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Declare mbedtls_md functions as MBEDTLS_CHECK_RETURN_TYPICAL, meaning that
their return values should be checked.

Do check the return values in our code. We were already doing that
everywhere for hash calculations, but not for HMAC calculations.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-12-10 21:35:10 +01:00
parent d5ba50e239
commit ecf6bebb9c
4 changed files with 110 additions and 30 deletions
Download patch file Download diff file Expand all files Collapse all files

14
include/mbedtls/md.h
View file

@ -29,6 +29,7 @@
#include <stddef.h>
#include "mbedtls/build_info.h"
#include "mbedtls/platform_util.h"
/** The selected feature is not available. */
#define MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE -0x5080
@ -181,6 +182,7 @@ void mbedtls_md_free( mbedtls_md_context_t *ctx );
* failure.
* \return #MBEDTLS_ERR_MD_ALLOC_FAILED on memory-allocation failure.
*/
MBEDTLS_CHECK_RETURN_TYPICAL
int mbedtls_md_setup( mbedtls_md_context_t *ctx, const mbedtls_md_info_t *md_info, int hmac );
/**
@ -202,6 +204,7 @@ int mbedtls_md_setup( mbedtls_md_context_t *ctx, const mbedtls_md_info_t *md_inf
* \return \c 0 on success.
* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification failure.
*/
MBEDTLS_CHECK_RETURN_TYPICAL
int mbedtls_md_clone( mbedtls_md_context_t *dst,
const mbedtls_md_context_t *src );
@ -251,6 +254,7 @@ const char *mbedtls_md_get_name( const mbedtls_md_info_t *md_info );
* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
* failure.
*/
MBEDTLS_CHECK_RETURN_TYPICAL
int mbedtls_md_starts( mbedtls_md_context_t *ctx );
/**
@ -269,6 +273,7 @@ int mbedtls_md_starts( mbedtls_md_context_t *ctx );
* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
* failure.
*/
MBEDTLS_CHECK_RETURN_TYPICAL
int mbedtls_md_update( mbedtls_md_context_t *ctx, const unsigned char *input, size_t ilen );
/**
@ -289,6 +294,7 @@ int mbedtls_md_update( mbedtls_md_context_t *ctx, const unsigned char *input, si
* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
* failure.
*/
MBEDTLS_CHECK_RETURN_TYPICAL
int mbedtls_md_finish( mbedtls_md_context_t *ctx, unsigned char *output );
/**
@ -309,6 +315,7 @@ int mbedtls_md_finish( mbedtls_md_context_t *ctx, unsigned char *output );
* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
* failure.
*/
MBEDTLS_CHECK_RETURN_TYPICAL
int mbedtls_md( const mbedtls_md_info_t *md_info, const unsigned char *input, size_t ilen,
unsigned char *output );
@ -330,6 +337,7 @@ int mbedtls_md( const mbedtls_md_info_t *md_info, const unsigned char *input, si
* the file pointed by \p path.
* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA if \p md_info was NULL.
*/
MBEDTLS_CHECK_RETURN_TYPICAL
int mbedtls_md_file( const mbedtls_md_info_t *md_info, const char *path,
unsigned char *output );
#endif /* MBEDTLS_FS_IO */
@ -352,6 +360,7 @@ int mbedtls_md_file( const mbedtls_md_info_t *md_info, const char *path,
* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
* failure.
*/
MBEDTLS_CHECK_RETURN_TYPICAL
int mbedtls_md_hmac_starts( mbedtls_md_context_t *ctx, const unsigned char *key,
size_t keylen );
@ -374,6 +383,7 @@ int mbedtls_md_hmac_starts( mbedtls_md_context_t *ctx, const unsigned char *key,
* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
* failure.
*/
MBEDTLS_CHECK_RETURN_TYPICAL
int mbedtls_md_hmac_update( mbedtls_md_context_t *ctx, const unsigned char *input,
size_t ilen );
@ -395,6 +405,7 @@ int mbedtls_md_hmac_update( mbedtls_md_context_t *ctx, const unsigned char *inpu
* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
* failure.
*/
MBEDTLS_CHECK_RETURN_TYPICAL
int mbedtls_md_hmac_finish( mbedtls_md_context_t *ctx, unsigned char *output);
/**
@ -412,6 +423,7 @@ int mbedtls_md_hmac_finish( mbedtls_md_context_t *ctx, unsigned char *output);
* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
* failure.
*/
MBEDTLS_CHECK_RETURN_TYPICAL
int mbedtls_md_hmac_reset( mbedtls_md_context_t *ctx );
/**
@ -436,11 +448,13 @@ int mbedtls_md_hmac_reset( mbedtls_md_context_t *ctx );
* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA on parameter-verification
* failure.
*/
MBEDTLS_CHECK_RETURN_TYPICAL
int mbedtls_md_hmac( const mbedtls_md_info_t *md_info, const unsigned char *key, size_t keylen,
const unsigned char *input, size_t ilen,
unsigned char *output );
/* Internal use */
MBEDTLS_CHECK_RETURN_TYPICAL
int mbedtls_md_process( mbedtls_md_context_t *ctx, const unsigned char *data );
#ifdef __cplusplus