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Check return code of mbedtls_mpi_fill_random

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Add MBEDTLS_MPI_CHK to check for error value of mbedtls_mpi_fill_random.
Reported and fix suggested by guidovranken in #740
This commit is contained in:
Ron Eldor 2017-01-12 14:50:50 +02:00 committed by Simon Butcher
parent 3e19df5c95
commit 7269fee0b6
3 changed files with 7 additions and 5 deletions
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2
ChangeLog
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@ -11,6 +11,8 @@ Bugfix
* Fix resource leak on windows platform, in mbedtls_x509_crt_parse_path. * Fix resource leak on windows platform, in mbedtls_x509_crt_parse_path.
In case of failure, when an error occures, goto cleanup. In case of failure, when an error occures, goto cleanup.
Found by redplait #590 Found by redplait #590
* Add MBEDTLS_MPI_CHK to check for error value of mbedtls_mpi_fill_random.
Reported and fix suggested by guidovranken in #740
Security Security
* Fix authentication bypass in SSL/TLS: when auth_mode is set to optional, * Fix authentication bypass in SSL/TLS: when auth_mode is set to optional,

6
library/dhm.c
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@ -165,7 +165,7 @@ int mbedtls_dhm_make_params( mbedtls_dhm_context *ctx, int x_size,
*/ */
do do
{ {
mbedtls_mpi_fill_random( &ctx->X, x_size, f_rng, p_rng ); MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &ctx->X, x_size, f_rng, p_rng ) );
while( mbedtls_mpi_cmp_mpi( &ctx->X, &ctx->P ) >= 0 ) while( mbedtls_mpi_cmp_mpi( &ctx->X, &ctx->P ) >= 0 )
MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &ctx->X, 1 ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &ctx->X, 1 ) );
@ -251,7 +251,7 @@ int mbedtls_dhm_make_public( mbedtls_dhm_context *ctx, int x_size,
*/ */
do do
{ {
mbedtls_mpi_fill_random( &ctx->X, x_size, f_rng, p_rng ); MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &ctx->X, x_size, f_rng, p_rng ) );
while( mbedtls_mpi_cmp_mpi( &ctx->X, &ctx->P ) >= 0 ) while( mbedtls_mpi_cmp_mpi( &ctx->X, &ctx->P ) >= 0 )
MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &ctx->X, 1 ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &ctx->X, 1 ) );
@ -324,7 +324,7 @@ static int dhm_update_blinding( mbedtls_dhm_context *ctx,
count = 0; count = 0;
do do
{ {
mbedtls_mpi_fill_random( &ctx->Vi, mbedtls_mpi_size( &ctx->P ), f_rng, p_rng ); MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &ctx->Vi, mbedtls_mpi_size( &ctx->P ), f_rng, p_rng ) );
while( mbedtls_mpi_cmp_mpi( &ctx->Vi, &ctx->P ) >= 0 ) while( mbedtls_mpi_cmp_mpi( &ctx->Vi, &ctx->P ) >= 0 )
MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &ctx->Vi, 1 ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &ctx->Vi, 1 ) );

4
library/ecp.c
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@ -1128,7 +1128,7 @@ static int ecp_randomize_jac( const mbedtls_ecp_group *grp, mbedtls_ecp_point *p
/* Generate l such that 1 < l < p */ /* Generate l such that 1 < l < p */
do do
{ {
mbedtls_mpi_fill_random( &l, p_size, f_rng, p_rng ); MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &l, p_size, f_rng, p_rng ) );
while( mbedtls_mpi_cmp_mpi( &l, &grp->P ) >= 0 ) while( mbedtls_mpi_cmp_mpi( &l, &grp->P ) >= 0 )
MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &l, 1 ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &l, 1 ) );
@ -1527,7 +1527,7 @@ static int ecp_randomize_mxz( const mbedtls_ecp_group *grp, mbedtls_ecp_point *P
/* Generate l such that 1 < l < p */ /* Generate l such that 1 < l < p */
do do
{ {
mbedtls_mpi_fill_random( &l, p_size, f_rng, p_rng ); MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &l, p_size, f_rng, p_rng ) );
while( mbedtls_mpi_cmp_mpi( &l, &grp->P ) >= 0 ) while( mbedtls_mpi_cmp_mpi( &l, &grp->P ) >= 0 )
MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &l, 1 ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &l, 1 ) );