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Remove MBEDTLS_TEST_NULL_ENTROPY config option.

Browse Source 
Building the library without entropy sources negates any and all security
provided by the library.
This option was originally requested a relatively long time ago and it
does not provide any tangible benefit for users any more.

Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
This commit is contained in:
Mateusz Starzyk 2021-04-30 13:28:22 +02:00
parent b6800788ca
commit 72f60dfcc1
15 changed files with 10 additions and 149 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
CMakeLists.txt
View File

@ -56,17 +56,6 @@ else()
endif()
# Warning string - created as a list for compatibility with CMake 2.8
set(WARNING_BORDER "*******************************************************\n")
set(NULL_ENTROPY_WARN_L1 "**** WARNING! MBEDTLS_TEST_NULL_ENTROPY defined!\n")
set(NULL_ENTROPY_WARN_L2 "**** THIS BUILD HAS NO DEFINED ENTROPY SOURCES\n")
set(NULL_ENTROPY_WARN_L3 "**** AND IS *NOT* SUITABLE FOR PRODUCTION USE\n")
set(NULL_ENTROPY_WARNING "${WARNING_BORDER}"
"${NULL_ENTROPY_WARN_L1}"
"${NULL_ENTROPY_WARN_L2}"
"${NULL_ENTROPY_WARN_L3}"
"${WARNING_BORDER}")
set(CTR_DRBG_128_BIT_KEY_WARN_L1 "**** WARNING! MBEDTLS_CTR_DRBG_USE_128_BIT_KEY defined!\n")
set(CTR_DRBG_128_BIT_KEY_WARN_L2 "**** Using 128-bit keys for CTR_DRBG limits the security of generated\n")
set(CTR_DRBG_128_BIT_KEY_WARN_L3 "**** keys and operations that use random values generated to 128-bit security\n")
@ -99,26 +88,6 @@ if(MBEDTLS_PYTHON_EXECUTABLE)
message(WARNING ${CTR_DRBG_128_BIT_KEY_WARNING})
endif()
# If NULL Entropy is configured, display an appropriate warning
execute_process(COMMAND ${MBEDTLS_PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/scripts/config.py -f ${CMAKE_CURRENT_SOURCE_DIR}/include/mbedtls/config.h get MBEDTLS_TEST_NULL_ENTROPY
RESULT_VARIABLE result)
if(${result} EQUAL 0)
message(WARNING ${NULL_ENTROPY_WARNING})
if(NOT UNSAFE_BUILD)
message(FATAL_ERROR "\
\n\
Warning! You have enabled MBEDTLS_TEST_NULL_ENTROPY. \
This option is not safe for production use and negates all security \
It is intended for development use only. \
\n\
To confirm you want to build with this option, re-run cmake with the \
option: \n\
cmake -DUNSAFE_BUILD=ON ")
return()
endif()
endif()
endif()
# If this is the root project add longer list of available CMAKE_BUILD_TYPE values

2
ChangeLog.d/remove_null_entropy.txt Normal file
View File

@ -0,0 +1,2 @@
API changes
* Remove the MBEDTLS_TEST_NULL_ENTROPY config option. Fixes #4388.

9
Makefile
View File

@ -59,12 +59,6 @@ uninstall:
done
endif
WARNING_BORDER =*******************************************************\n
NULL_ENTROPY_WARN_L1=**** WARNING! MBEDTLS_TEST_NULL_ENTROPY defined! ****\n
NULL_ENTROPY_WARN_L2=**** THIS BUILD HAS NO DEFINED ENTROPY SOURCES ****\n
NULL_ENTROPY_WARN_L3=**** AND IS *NOT* SUITABLE FOR PRODUCTION USE ****\n
NULL_ENTROPY_WARNING=\n$(WARNING_BORDER)$(NULL_ENTROPY_WARN_L1)$(NULL_ENTROPY_WARN_L2)$(NULL_ENTROPY_WARN_L3)$(WARNING_BORDER)
WARNING_BORDER_LONG =**********************************************************************************\n
CTR_DRBG_128_BIT_KEY_WARN_L1=**** WARNING! MBEDTLS_CTR_DRBG_USE_128_BIT_KEY defined! ****\n
@ -81,9 +75,6 @@ ifndef WINDOWS
-scripts/config.py get MBEDTLS_CTR_DRBG_USE_128_BIT_KEY && ([ $$? -eq 0 ]) && \
echo '$(CTR_DRBG_128_BIT_KEY_WARNING)'
# If NULL Entropy is configured, display an appropriate warning
-scripts/config.py get MBEDTLS_TEST_NULL_ENTROPY && ([ $$? -eq 0 ]) && \
echo '$(NULL_ENTROPY_WARNING)'
endif
clean:

9
include/mbedtls/check_config.h
View File

@ -201,15 +201,6 @@
#endif
#undef MBEDTLS_HAS_MEMSAN
#if defined(MBEDTLS_TEST_NULL_ENTROPY) && \
( !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES) )
#error "MBEDTLS_TEST_NULL_ENTROPY defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_TEST_NULL_ENTROPY) && \
( defined(MBEDTLS_ENTROPY_NV_SEED) || defined(MBEDTLS_ENTROPY_HARDWARE_ALT) )
#error "MBEDTLS_TEST_NULL_ENTROPY defined, but entropy sources too"
#endif
#if defined(MBEDTLS_GCM_C) && ( \
!defined(MBEDTLS_AES_C) && !defined(MBEDTLS_CAMELLIA_C) && !defined(MBEDTLS_ARIA_C) )
#error "MBEDTLS_GCM_C defined, but not all prerequisites"

17
include/mbedtls/config.h
View File

@ -527,23 +527,6 @@
//#define MBEDTLS_ECP_RANDOMIZE_MXZ_ALT
//#define MBEDTLS_ECP_NORMALIZE_MXZ_ALT
/**
* \def MBEDTLS_TEST_NULL_ENTROPY
*
* Enables testing and use of mbed TLS without any configured entropy sources.
* This permits use of the library on platforms before an entropy source has
* been integrated (see for example the MBEDTLS_ENTROPY_HARDWARE_ALT or the
* MBEDTLS_ENTROPY_NV_SEED switches).
*
* WARNING! This switch MUST be disabled in production builds, and is suitable
* only for development.
* Enabling the switch negates any security provided by the library.
*
* Requires MBEDTLS_ENTROPY_C, MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES
*
*/
//#define MBEDTLS_TEST_NULL_ENTROPY
/**
* \def MBEDTLS_ENTROPY_HARDWARE_ALT
*

17
library/entropy.c
View File

@ -21,12 +21,6 @@
#if defined(MBEDTLS_ENTROPY_C)
#if defined(MBEDTLS_TEST_NULL_ENTROPY)
#warning "**** WARNING! MBEDTLS_TEST_NULL_ENTROPY defined! "
#warning "**** THIS BUILD HAS NO DEFINED ENTROPY SOURCES "
#warning "**** THIS BUILD IS *NOT* SUITABLE FOR PRODUCTION USE "
#endif
#include "mbedtls/entropy.h"
#include "entropy_poll.h"
#include "mbedtls/platform_util.h"
@ -73,11 +67,6 @@ void mbedtls_entropy_init( mbedtls_entropy_context *ctx )
/* Reminder: Update ENTROPY_HAVE_STRONG in the test files
* when adding more strong entropy sources here. */
#if defined(MBEDTLS_TEST_NULL_ENTROPY)
mbedtls_entropy_add_source( ctx, mbedtls_null_entropy_poll, NULL,
1, MBEDTLS_ENTROPY_SOURCE_STRONG );
#endif
#if !defined(MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES)
#if !defined(MBEDTLS_NO_PLATFORM_ENTROPY)
mbedtls_entropy_add_source( ctx, mbedtls_platform_entropy_poll, NULL,
@ -524,7 +513,6 @@ int mbedtls_entropy_update_seed_file( mbedtls_entropy_context *ctx, const char *
#endif /* MBEDTLS_FS_IO */
#if defined(MBEDTLS_SELF_TEST)
#if !defined(MBEDTLS_TEST_NULL_ENTROPY)
/*
* Dummy source function
*/
@ -538,7 +526,6 @@ static int entropy_dummy_source( void *data, unsigned char *output,
return( 0 );
}
#endif /* !MBEDTLS_TEST_NULL_ENTROPY */
#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
@ -646,17 +633,14 @@ cleanup:
int mbedtls_entropy_self_test( int verbose )
{
int ret = 1;
#if !defined(MBEDTLS_TEST_NULL_ENTROPY)
mbedtls_entropy_context ctx;
unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 };
unsigned char acc[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 };
size_t i, j;
#endif /* !MBEDTLS_TEST_NULL_ENTROPY */
if( verbose != 0 )
mbedtls_printf( " ENTROPY test: " );
#if !defined(MBEDTLS_TEST_NULL_ENTROPY)
mbedtls_entropy_init( &ctx );
/* First do a gather to make sure we have default sources */
@ -704,7 +688,6 @@ int mbedtls_entropy_self_test( int verbose )
cleanup:
mbedtls_entropy_free( &ctx );
#endif /* !MBEDTLS_TEST_NULL_ENTROPY */
if( verbose != 0 )
{

17
library/entropy_poll.c
View File

@ -211,23 +211,6 @@ int mbedtls_platform_entropy_poll( void *data,
#endif /* _WIN32 && !EFIX64 && !EFI32 */
#endif /* !MBEDTLS_NO_PLATFORM_ENTROPY */
#if defined(MBEDTLS_TEST_NULL_ENTROPY)
int mbedtls_null_entropy_poll( void *data,
unsigned char *output, size_t len, size_t *olen )
{
((void) data);
((void) output);
*olen = 0;
if( len < sizeof(unsigned char) )
return( 0 );
output[0] = 0;
*olen = sizeof(unsigned char);
return( 0 );
}
#endif
#if defined(MBEDTLS_TIMING_C)
int mbedtls_hardclock_poll( void *data,
unsigned char *output, size_t len, size_t *olen )

8
library/entropy_poll.h
View File

@ -43,14 +43,6 @@ extern "C" {
#define MBEDTLS_ENTROPY_MIN_HARDWARE 32 /**< Minimum for the hardware source */
#endif
/**
* \brief Entropy poll callback that provides 0 entropy.
*/
#if defined(MBEDTLS_TEST_NULL_ENTROPY)
int mbedtls_null_entropy_poll( void *data,
unsigned char *output, size_t len, size_t *olen );
#endif
#if !defined(MBEDTLS_NO_PLATFORM_ENTROPY)
/**
* \brief Platform-specific entropy poll callback

3
library/version_features.c
View File

@ -252,9 +252,6 @@ static const char * const features[] = {
#if defined(MBEDTLS_ECP_NORMALIZE_MXZ_ALT)
"MBEDTLS_ECP_NORMALIZE_MXZ_ALT",
#endif /* MBEDTLS_ECP_NORMALIZE_MXZ_ALT */
#if defined(MBEDTLS_TEST_NULL_ENTROPY)
"MBEDTLS_TEST_NULL_ENTROPY",
#endif /* MBEDTLS_TEST_NULL_ENTROPY */
#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
"MBEDTLS_ENTROPY_HARDWARE_ALT",
#endif /* MBEDTLS_ENTROPY_HARDWARE_ALT */

8
programs/test/query_config.c
View File

@ -723,14 +723,6 @@ int query_config( const char *config )
}
#endif /* MBEDTLS_ECP_NORMALIZE_MXZ_ALT */
#if defined(MBEDTLS_TEST_NULL_ENTROPY)
if( strcmp( "MBEDTLS_TEST_NULL_ENTROPY", config ) == 0 )
{
MACRO_EXPANSION_TO_STR( MBEDTLS_TEST_NULL_ENTROPY );
return( 0 );
}
#endif /* MBEDTLS_TEST_NULL_ENTROPY */
#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
if( strcmp( "MBEDTLS_ENTROPY_HARDWARE_ALT", config ) == 0 )
{

1
scripts/config.py
View File

@ -194,7 +194,6 @@ EXCLUDE_FROM_FULL = frozenset([
'MBEDTLS_SHA512_NO_SHA384', # removes a feature
'MBEDTLS_TEST_CONSTANT_FLOW_MEMSAN', # build dependency (clang+memsan)
'MBEDTLS_TEST_CONSTANT_FLOW_VALGRIND', # build dependency (valgrind headers)
'MBEDTLS_TEST_NULL_ENTROPY', # removes a feature
'MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION', # influences the use of X.509 in TLS
'MBEDTLS_X509_REMOVE_INFO', # removes a feature
])

15
tests/scripts/all.sh
View File

@ -2072,21 +2072,6 @@ component_test_when_no_ciphersuites_have_mac () {
if_build_succeeded tests/ssl-opt.sh -f 'Default\|EtM' -e 'without EtM'
}
component_test_null_entropy () {
msg "build: default config with MBEDTLS_TEST_NULL_ENTROPY (ASan build)"
scripts/config.py set MBEDTLS_TEST_NULL_ENTROPY
scripts/config.py set MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES
scripts/config.py set MBEDTLS_ENTROPY_C
scripts/config.py unset MBEDTLS_ENTROPY_NV_SEED
scripts/config.py unset MBEDTLS_PLATFORM_NV_SEED_ALT
scripts/config.py unset MBEDTLS_ENTROPY_HARDWARE_ALT
CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan -D UNSAFE_BUILD=ON .
make
msg "test: MBEDTLS_TEST_NULL_ENTROPY - main suites (inc. selftests) (ASan build)"
make test
}
component_test_no_date_time () {
msg "build: default config without MBEDTLS_HAVE_TIME_DATE"
scripts/config.py unset MBEDTLS_HAVE_TIME_DATE

9
tests/suites/helpers.function
View File

@ -87,11 +87,10 @@ jmp_buf jmp_tmp;
/* Indicates whether we expect mbedtls_entropy_init
* to initialize some strong entropy source. */
#if defined(MBEDTLS_TEST_NULL_ENTROPY) || \
( !defined(MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES) && \
( !defined(MBEDTLS_NO_PLATFORM_ENTROPY) || \
defined(MBEDTLS_ENTROPY_HARDWARE_ALT) || \
defined(ENTROPY_NV_SEED) ) )
#if !defined(MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES) && \
( !defined(MBEDTLS_NO_PLATFORM_ENTROPY) || \
defined(MBEDTLS_ENTROPY_HARDWARE_ALT) || \
defined(ENTROPY_NV_SEED) )
#define ENTROPY_HAVE_STRONG
#endif

5
tests/suites/test_suite_entropy.data
View File

@ -83,9 +83,4 @@ Check NV seed manually #3
entropy_nv_seed:"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
Entropy self test
depends_on:!MBEDTLS_TEST_NULL_ENTROPY
entropy_selftest:0
Entropy self test (MBEDTLS_TEST_NULL_ENTROPY)
depends_on:MBEDTLS_TEST_NULL_ENTROPY
entropy_selftest:1

8
tests/suites/test_suite_random.function
View File

@ -18,7 +18,7 @@
/* END_HEADER */
/* BEGIN_CASE depends_on:MBEDTLS_ENTROPY_C:!MBEDTLS_TEST_NULL_ENTROPY:MBEDTLS_CTR_DRBG_C */
/* BEGIN_CASE depends_on:MBEDTLS_ENTROPY_C:MBEDTLS_CTR_DRBG_C */
void random_twice_with_ctr_drbg( )
{
mbedtls_entropy_context entropy;
@ -57,7 +57,7 @@ exit:
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_ENTROPY_C:!MBEDTLS_TEST_NULL_ENTROPY:MBEDTLS_HMAC_DRBG_C */
/* BEGIN_CASE depends_on:MBEDTLS_ENTROPY_C:MBEDTLS_HMAC_DRBG_C */
void random_twice_with_hmac_drbg( int md_type )
{
mbedtls_entropy_context entropy;
@ -97,7 +97,7 @@ exit:
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_PSA_CRYPTO_C:!MBEDTLS_TEST_NULL_ENTROPY:!MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
/* BEGIN_CASE depends_on:MBEDTLS_PSA_CRYPTO_C:!MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
void random_twice_with_psa_from_classic( )
{
unsigned char output1[OUTPUT_SIZE];
@ -123,7 +123,7 @@ exit:
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_PSA_CRYPTO_C:!MBEDTLS_TEST_NULL_ENTROPY:!MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
/* BEGIN_CASE depends_on:MBEDTLS_PSA_CRYPTO_C:!MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
void random_twice_with_psa_from_psa( )
{
unsigned char output1[OUTPUT_SIZE];