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Merge remote-tracking branch 'upstream-restricted/pr/360' into mbedtls-2.1-restricted-proposed

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Conflicts:
* scripts/config.pl: reconciled parallel edits in a comment.
This commit is contained in:
Gilles Peskine 2018-03-13 17:26:49 +01:00
commit 8c1217984b
7 changed files with 108 additions and 61 deletions
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3
ChangeLog
View File

@ -17,6 +17,8 @@ Security
implementation allowed an offline 2^80 brute force attack on the
HMAC key of a single, uninterrupted connection (with no
resumption of the session).
* Verify results of RSA private key operations to defend
against Bellcore glitch attack.
Features
* Extend PKCS#8 interface by introducing support for the entire SHA
@ -51,6 +53,7 @@ Bugfix
structure. Do not assume that zeroizing a context is a correct way to
reset it. Found independently by ccli8 on Github.
* In mbedtls_entropy_free(), properly free the message digest context.
* Fix memory leak in RSA self test.
Changes
* Clarified the documentation of mbedtls_ssl_setup.

14
include/mbedtls/rsa.h
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@ -220,7 +220,7 @@ int mbedtls_rsa_public( mbedtls_rsa_context *ctx,
* \brief Do an RSA private key operation
*
* \param ctx RSA context
* \param f_rng RNG function (Needed for blinding)
* \param f_rng RNG function (used for blinding)
* \param p_rng RNG parameter
* \param input input buffer
* \param output output buffer
@ -229,6 +229,18 @@ int mbedtls_rsa_public( mbedtls_rsa_context *ctx,
*
* \note The input and output buffers must be large
* enough (eg. 128 bytes if RSA-1024 is used).
*
* \note Blinding is used if and only if a PRNG is provided.
*
* \note If blinding is used, both the base of exponentation
* and the exponent are blinded, providing protection
* against some side-channel attacks.
*
* \warning It is deprecated and a security risk to not provide
* a PRNG here and thereby prevent the use of blinding.
* Future versions of the library may enforce the presence
* of a PRNG.
*
*/
int mbedtls_rsa_private( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),

2
library/bignum.c
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@ -1613,7 +1613,7 @@ int mbedtls_mpi_exp_mod( mbedtls_mpi *X, const mbedtls_mpi *A, const mbedtls_mpi
mbedtls_mpi RR, T, W[ 2 << MBEDTLS_MPI_WINDOW_SIZE ], Apos;
int neg;
if( mbedtls_mpi_cmp_int( N, 0 ) < 0 || ( N->p[0] & 1 ) == 0 )
if( mbedtls_mpi_cmp_int( N, 0 ) <= 0 || ( N->p[0] & 1 ) == 0 )
return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
if( mbedtls_mpi_cmp_int( E, 0 ) < 0 )

114
library/rsa.c
View File

@ -403,9 +403,41 @@ int mbedtls_rsa_private( mbedtls_rsa_context *ctx,
mbedtls_mpi *DQ = &ctx->DQ;
#endif
/* Temporaries holding the initial input and the double
* checked result; should be the same in the end. */
mbedtls_mpi I, C;
/* Make sure we have private key info, prevent possible misuse */
if( ctx->P.p == NULL || ctx->Q.p == NULL || ctx->D.p == NULL )
#if defined(MBEDTLS_RSA_NO_CRT)
if( mbedtls_mpi_cmp_int( &ctx->N, 0 ) == 0 ||
mbedtls_mpi_cmp_int( &ctx->D, 0 ) == 0 ||
mbedtls_mpi_cmp_int( &ctx->E, 0 ) == 0 ||
( f_rng != NULL && mbedtls_mpi_cmp_int( &ctx->P, 0 ) == 0 ) ||
( f_rng != NULL && mbedtls_mpi_cmp_int( &ctx->Q, 0 ) == 0 ) )
{
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
}
#else /* ! MBEDTLS_RSA_NO_CRT */
if( mbedtls_mpi_cmp_int( &ctx->N, 0 ) == 0 ||
mbedtls_mpi_cmp_int( &ctx->E, 0 ) == 0 ||
mbedtls_mpi_cmp_int( &ctx->P, 0 ) == 0 ||
mbedtls_mpi_cmp_int( &ctx->Q, 0 ) == 0 ||
mbedtls_mpi_cmp_int( &ctx->DP, 0 ) == 0 ||
mbedtls_mpi_cmp_int( &ctx->DQ, 0 ) == 0 ||
mbedtls_mpi_cmp_int( &ctx->QP, 0 ) == 0 )
{
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
}
#endif /* ! MBEDTLS_RSA_NO_CRT */
#if defined(MBEDTLS_THREADING_C)
if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
return( ret );
#endif
mbedtls_mpi_init( &I );
mbedtls_mpi_init( &C );
mbedtls_mpi_init( &T ); mbedtls_mpi_init( &T1 ); mbedtls_mpi_init( &T2 );
mbedtls_mpi_init( &P1 ); mbedtls_mpi_init( &Q1 ); mbedtls_mpi_init( &R );
@ -421,12 +453,6 @@ int mbedtls_rsa_private( mbedtls_rsa_context *ctx,
#endif
}
#if defined(MBEDTLS_THREADING_C)
if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
return( ret );
#endif
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &T, input, ctx->len ) );
if( mbedtls_mpi_cmp_mpi( &T, &ctx->N ) >= 0 )
{
@ -434,6 +460,8 @@ int mbedtls_rsa_private( mbedtls_rsa_context *ctx,
goto cleanup;
}
MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &I, &T ) );
if( f_rng != NULL )
{
/*
@ -522,6 +550,15 @@ int mbedtls_rsa_private( mbedtls_rsa_context *ctx,
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &T, &T, &ctx->N ) );
}
/* Verify the result to prevent glitching attacks. */
MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &C, &T, &ctx->E,
&ctx->N, &ctx->RN ) );
if( mbedtls_mpi_cmp_mpi( &C, &I ) != 0 )
{
ret = MBEDTLS_ERR_RSA_VERIFY_FAILED;
goto cleanup;
}
olen = ctx->len;
MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &T, output, olen ) );
@ -544,6 +581,9 @@ cleanup:
#endif
}
mbedtls_mpi_free( &C );
mbedtls_mpi_free( &I );
if( ret != 0 )
return( MBEDTLS_ERR_RSA_PRIVATE_FAILED + ret );
@ -1167,11 +1207,6 @@ int mbedtls_rsa_rsassa_pkcs1_v15_sign( mbedtls_rsa_context *ctx,
size_t nb_pad, olen, oid_size = 0;
unsigned char *p = sig;
const char *oid = NULL;
unsigned char *sig_try = NULL, *verif = NULL;
size_t i;
unsigned char diff;
volatile unsigned char diff_no_optimize;
int ret;
if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V15 )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
@ -1237,42 +1272,7 @@ int mbedtls_rsa_rsassa_pkcs1_v15_sign( mbedtls_rsa_context *ctx,
if( mode == MBEDTLS_RSA_PUBLIC )
return( mbedtls_rsa_public( ctx, sig, sig ) );
/*
* In order to prevent Lenstra's attack, make the signature in a
* temporary buffer and check it before returning it.
*/
sig_try = mbedtls_calloc( 1, ctx->len );
if( sig_try == NULL )
return( MBEDTLS_ERR_MPI_ALLOC_FAILED );
verif = mbedtls_calloc( 1, ctx->len );
if( verif == NULL )
{
mbedtls_free( sig_try );
return( MBEDTLS_ERR_MPI_ALLOC_FAILED );
}
MBEDTLS_MPI_CHK( mbedtls_rsa_private( ctx, f_rng, p_rng, sig, sig_try ) );
MBEDTLS_MPI_CHK( mbedtls_rsa_public( ctx, sig_try, verif ) );
/* Compare in constant time just in case */
for( diff = 0, i = 0; i < ctx->len; i++ )
diff |= verif[i] ^ sig[i];
diff_no_optimize = diff;
if( diff_no_optimize != 0 )
{
ret = MBEDTLS_ERR_RSA_PRIVATE_FAILED;
goto cleanup;
}
memcpy( sig, sig_try, ctx->len );
cleanup:
mbedtls_free( sig_try );
mbedtls_free( verif );
return( ret );
return( mbedtls_rsa_private( ctx, f_rng, p_rng, sig, sig ) );
}
#endif /* MBEDTLS_PKCS1_V15 */
@ -1792,7 +1792,8 @@ int mbedtls_rsa_self_test( int verbose )
if( verbose != 0 )
mbedtls_printf( "failed\n" );
return( 1 );
ret = 1;
goto cleanup;
}
if( verbose != 0 )
@ -1806,7 +1807,8 @@ int mbedtls_rsa_self_test( int verbose )
if( verbose != 0 )
mbedtls_printf( "failed\n" );
return( 1 );
ret = 1;
goto cleanup;
}
if( verbose != 0 )
@ -1819,7 +1821,8 @@ int mbedtls_rsa_self_test( int verbose )
if( verbose != 0 )
mbedtls_printf( "failed\n" );
return( 1 );
ret = 1;
goto cleanup;
}
if( memcmp( rsa_decrypted, rsa_plaintext, len ) != 0 )
@ -1827,7 +1830,8 @@ int mbedtls_rsa_self_test( int verbose )
if( verbose != 0 )
mbedtls_printf( "failed\n" );
return( 1 );
ret = 1;
goto cleanup;
}
if( verbose != 0 )
@ -1845,7 +1849,8 @@ int mbedtls_rsa_self_test( int verbose )
if( verbose != 0 )
mbedtls_printf( "failed\n" );
return( 1 );
ret = 1;
goto cleanup;
}
if( verbose != 0 )
@ -1857,7 +1862,8 @@ int mbedtls_rsa_self_test( int verbose )
if( verbose != 0 )
mbedtls_printf( "failed\n" );
return( 1 );
ret = 1;
goto cleanup;
}
if( verbose != 0 )

6
scripts/config.pl
View File

@ -76,6 +76,11 @@ Options
EOU
# The following options are disabled instead of enabled with "full".
# Notes:
# - MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3 and
# MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION could be enabled if the
# respective tests were adapted
my @excluded = qw(
MBEDTLS_DEPRECATED_REMOVED
MBEDTLS_HAVE_SSE2
@ -87,6 +92,7 @@ MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES
MBEDTLS_NO_PLATFORM_ENTROPY
MBEDTLS_REMOVE_ARC4_CIPHERSUITES
MBEDTLS_SSL_HW_RECORD_ACCEL
MBEDTLS_RSA_NO_CRT
MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3
MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
MBEDTLS_ZLIB_SUPPORT

17
tests/scripts/all.sh
View File

@ -478,6 +478,23 @@ make test
msg "test: !MBEDTLS_SSL_RENEGOTIATION - ssl-opt.sh (ASan build)" # ~ 6 min
if_build_succeeded tests/ssl-opt.sh
msg "build: Default + RSA_NO_CRT (ASan build)" # ~ 6 min
cleanup
cp "$CONFIG_H" "$CONFIG_BAK"
scripts/config.pl set MBEDTLS_RSA_NO_CRT
CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
make
msg "test: RSA_NO_CRT - main suites (inc. selftests) (ASan build)" # ~ 50s
make test
msg "test: RSA_NO_CRT - RSA-related part of ssl-opt.sh (ASan build)" # ~ 5s
tests/ssl-opt.sh -f RSA
msg "test: RSA_NO_CRT - RSA-related part of compat.sh (ASan build)" # ~ 3 min
tests/compat.sh -t RSA
msg "build: cmake, full config, clang" # ~ 50s
cleanup
cp "$CONFIG_H" "$CONFIG_BAK"

7
tests/suites/test_suite_pk.function
View File

@ -43,7 +43,8 @@ int mbedtls_rsa_decrypt_func( void *ctx, int mode, size_t *olen,
const unsigned char *input, unsigned char *output,
size_t output_max_len )
{
return( mbedtls_rsa_pkcs1_decrypt( (mbedtls_rsa_context *) ctx, NULL, NULL, mode, olen,
return( mbedtls_rsa_pkcs1_decrypt( (mbedtls_rsa_context *) ctx,
rnd_std_rand, NULL, mode, olen,
input, output, output_max_len ) );
}
int mbedtls_rsa_sign_func( void *ctx,
@ -51,7 +52,9 @@ int mbedtls_rsa_sign_func( void *ctx,
int mode, mbedtls_md_type_t md_alg, unsigned int hashlen,
const unsigned char *hash, unsigned char *sig )
{
return( mbedtls_rsa_pkcs1_sign( (mbedtls_rsa_context *) ctx, f_rng, p_rng, mode,
((void) f_rng);
((void) p_rng);
return( mbedtls_rsa_pkcs1_sign( (mbedtls_rsa_context *) ctx, rnd_std_rand, NULL, mode,
md_alg, hashlen, hash, sig ) );
}
size_t mbedtls_rsa_key_len_func( void *ctx )