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Checking in critical places if secured memset() and memcpy() was successful

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Signed-off-by: Piotr Nowicki <piotr.nowicki@arm.com>
This commit is contained in:
Piotr Nowicki 2020-08-10 17:42:18 +02:00
parent ea8e846fdc
commit 305a5ec496
5 changed files with 87 additions and 25 deletions
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7
library/entropy.c
View File

@ -462,9 +462,10 @@ int mbedtls_entropy_func( void *data, unsigned char *output, size_t len )
for( i = 0; i < ctx->source_count; i++ )
ctx->source[i].size = 0;
mbedtls_platform_memcpy( output, buf, len );
ret = 0;
if( output == mbedtls_platform_memcpy( output, buf, len ) )
{
ret = 0;
}
exit:
mbedtls_platform_zeroize( buf, sizeof( buf ) );

14
library/pkparse.c
View File

@ -561,9 +561,13 @@ static int uecc_public_key_read_binary( mbedtls_uecc_keypair *uecc_keypair,
if( buf[0] != 0x04 )
return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
mbedtls_platform_memcpy( uecc_keypair->public_key, buf + 1, 2 * NUM_ECC_BYTES );
if( mbedtls_platform_memcpy( uecc_keypair->public_key, buf + 1, 2 * NUM_ECC_BYTES ) ==
uecc_keypair->public_key )
{
return( 0 );
}
return( 0 );
return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
}
static int pk_get_ueccpubkey( unsigned char **p,
@ -976,7 +980,11 @@ static int pk_parse_key_sec1_der( mbedtls_uecc_keypair *keypair,
if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT + ret );
mbedtls_platform_memcpy( keypair->private_key, p, len );
if( mbedtls_platform_memcpy( keypair->private_key, p, len ) !=
keypair->private_key )
{
return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
}
p += len;

23
library/rsa.c
View File

@ -60,9 +60,9 @@
#include <stdlib.h>
#endif
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#if !defined(MBEDTLS_PLATFORM_C)
#include <stdio.h>
#define mbedtls_printf printf
#define mbedtls_calloc calloc
@ -1974,8 +1974,11 @@ static int rsa_rsassa_pkcs1_v15_encode( mbedtls_md_type_t md_alg,
/* Are we signing raw data? */
if( md_alg == MBEDTLS_MD_NONE )
{
mbedtls_platform_memcpy( p, hash, hashlen );
return( 0 );
if( mbedtls_platform_memcpy( p, hash, hashlen ) == p )
{
return( 0 );
}
return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
}
/* Signing hashed data, add corresponding ASN.1 structure
@ -2003,7 +2006,10 @@ static int rsa_rsassa_pkcs1_v15_encode( mbedtls_md_type_t md_alg,
*p++ = 0x00;
*p++ = MBEDTLS_ASN1_OCTET_STRING;
*p++ = (unsigned char) hashlen;
mbedtls_platform_memcpy( p, hash, hashlen );
if( mbedtls_platform_memcpy( p, hash, hashlen ) != p )
{
return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
}
p += hashlen;
/* Just a sanity-check, should be automatic
@ -2029,7 +2035,7 @@ int mbedtls_rsa_rsassa_pkcs1_v15_sign( mbedtls_rsa_context *ctx,
const unsigned char *hash,
unsigned char *sig )
{
int ret;
int ret = MBEDTLS_ERR_PLATFORM_FAULT_DETECTED;
unsigned char *sig_try = NULL, *verif = NULL;
RSA_VALIDATE_RET( ctx != NULL );
@ -2087,7 +2093,10 @@ int mbedtls_rsa_rsassa_pkcs1_v15_sign( mbedtls_rsa_context *ctx,
goto cleanup;
}
mbedtls_platform_memcpy( sig, sig_try, ctx->len );
if( mbedtls_platform_memcpy( sig, sig_try, ctx->len ) != sig )
{
ret = MBEDTLS_ERR_PLATFORM_FAULT_DETECTED;
}
cleanup:
mbedtls_free( sig_try );

63
library/ssl_tls.c
View File

@ -92,7 +92,11 @@ int mbedtls_ssl_ecdh_read_peerkey( mbedtls_ssl_context *ssl,
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
mbedtls_platform_memcpy( ssl->handshake->ecdh_peerkey, *p + 2, 2 * NUM_ECC_BYTES );
if( mbedtls_platform_memcpy( ssl->handshake->ecdh_peerkey, *p + 2, 2 * NUM_ECC_BYTES ) !=
ssl->handshake->ecdh_peerkey )
{
return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
}
*p += secp256r1_uncompressed_point_length;
return( 0 );
@ -1886,7 +1890,7 @@ static int ssl_compute_master( mbedtls_ssl_handshake_params *handshake,
return( ret );
}
if( handshake->premaster == mbedtls_platform_zeroize(
if( handshake->premaster == mbedtls_platform_zeroize(
handshake->premaster, sizeof(handshake->premaster) ) )
{
return( 0 );
@ -2293,7 +2297,10 @@ int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exch
if( end < p || (size_t)( end - p ) < psk_len )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
mbedtls_platform_memcpy( p, psk, psk_len );
if( mbedtls_platform_memcpy( p, psk, psk_len ) != p )
{
return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
}
p += psk_len;
ssl->handshake->pmslen = p - ssl->handshake->premaster;
@ -4495,8 +4502,16 @@ int mbedtls_ssl_write_handshake_msg( mbedtls_ssl_context *ssl )
/* Handshake hashes are computed without fragmentation,
* so set frag_offset = 0 and frag_len = hs_len for now */
mbedtls_platform_memset( ssl->out_msg + 6, 0x00, 3 );
mbedtls_platform_memcpy( ssl->out_msg + 9, ssl->out_msg + 1, 3 );
if( mbedtls_platform_memset( ssl->out_msg + 6, 0x00, 3 ) !=
ssl->out_msg + 6 )
{
return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
}
if( mbedtls_platform_memcpy( ssl->out_msg + 9, ssl->out_msg + 1, 3 ) !=
ssl->out_msg + 9 )
{
return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
}
}
#endif /* MBEDTLS_SSL_PROTO_DTLS */
@ -6127,9 +6142,24 @@ static int ssl_buffer_message( mbedtls_ssl_context *ssl )
/* Prepare final header: copy msg_type, length and message_seq,
* then add standardised fragment_offset and fragment_length */
mbedtls_platform_memcpy( hs_buf->data, ssl->in_msg, 6 );
mbedtls_platform_memset( hs_buf->data + 6, 0, 3 );
mbedtls_platform_memcpy( hs_buf->data + 9, hs_buf->data + 1, 3 );
if( mbedtls_platform_memcpy( hs_buf->data, ssl->in_msg, 6 ) !=
hs_buf->data )
{
ret = MBEDTLS_ERR_PLATFORM_FAULT_DETECTED;
goto exit;
}
if( mbedtls_platform_memset( hs_buf->data + 6, 0, 3 ) !=
hs_buf->data + 6 )
{
ret = MBEDTLS_ERR_PLATFORM_FAULT_DETECTED;
goto exit;
}
if( mbedtls_platform_memcpy( hs_buf->data + 9, hs_buf->data + 1, 3 ) !=
hs_buf->data + 9 )
{
ret = MBEDTLS_ERR_PLATFORM_FAULT_DETECTED;
goto exit;
}
hs_buf->is_valid = 1;
@ -11179,11 +11209,19 @@ int mbedtls_ssl_read( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
n = ( len < ssl->in_msglen )
? len : ssl->in_msglen;
mbedtls_platform_memcpy( buf, ssl->in_offt, n );
if( mbedtls_platform_memcpy( buf, ssl->in_offt, n ) !=
buf )
{
return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
}
ssl->in_msglen -= n;
// clear incoming data after it's copied to buffer
mbedtls_platform_memset(ssl->in_offt, 0, n);
if( mbedtls_platform_memset( ssl->in_offt, 0, n ) !=
ssl->in_offt )
{
return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
}
if( ssl->in_msglen == 0 )
{
@ -11273,7 +11311,10 @@ static int ssl_write_real( mbedtls_ssl_context *ssl,
*/
ssl->out_msglen = len;
ssl->out_msgtype = MBEDTLS_SSL_MSG_APPLICATION_DATA;
mbedtls_platform_memcpy( ssl->out_msg, buf, len );
if( mbedtls_platform_memcpy( ssl->out_msg, buf, len ) != ssl->out_msg )
{
return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED );
}
#if defined(MBEDTLS_FI_COUNTERMEASURES) && !defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
/*

5
tinycrypt/ecc_dh.c
View File

@ -81,7 +81,10 @@ int uECC_make_key_with_d(uint8_t *public_key, uint8_t *private_key,
/* This function is designed for test purposes-only (such as validating NIST
* test vectors) as it uses a provided value for d instead of generating
* it uniformly at random. */
mbedtls_platform_memcpy (_private, d, NUM_ECC_BYTES);
if( mbedtls_platform_memcpy (_private, d, NUM_ECC_BYTES) != _private )
{
goto exit;
}
/* Computing public-key from private: */
ret = EccPoint_compute_public_key(_public, _private);