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Merge branch 'mbedtls-2.4-restricted'

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This commit is contained in:
Simon Butcher 2017-02-05 22:00:35 +00:00
parent 81d92c3b03 ac63477e5a
commit 01e3beb067
5 changed files with 47 additions and 17 deletions
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8
ChangeLog
View file

@ -2,6 +2,11 @@ mbed TLS ChangeLog (Sorted per branch, date)
= mbed TLS 2.x.x branch released xxxx-xx-xx
Security
* Removed MD5 from the allowed hash algorithms for CertificateRequest and
CertificateVerify messages, to prevent SLOTH attacks against TLS 1.2.
Introduced by interoperability fix for #513.
Bugfix
* Fix the redefinition of macro ssl_set_bio to an undefined symbol
mbedtls_ssl_set_bio_timeout in compat-1.3.h, by removing it.
@ -22,6 +27,9 @@ Bugfix
cause buffer bound checks to be bypassed. Found by Eyal Itkin.
* Fixed potential arithmetic overflow in mbedtls_base64_decode() that could
cause buffer bound checks to be bypassed. Found by Eyal Itkin.
* Fixed multiple buffer overreads in mbedtls_pem_read_buffer() when parsing
the input string in PEM format to extract the different components. Found
by Eyal Itkin.
= mbed TLS 2.4.1 branch released 2016-12-13

20
library/pem.c
View file

@ -249,7 +249,7 @@ int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const
enc = 0;
if( memcmp( s1, "Proc-Type: 4,ENCRYPTED", 22 ) == 0 )
if( s2 - s1 >= 22 && memcmp( s1, "Proc-Type: 4,ENCRYPTED", 22 ) == 0 )
{
#if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \
( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
@ -262,22 +262,22 @@ int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const
#if defined(MBEDTLS_DES_C)
if( memcmp( s1, "DEK-Info: DES-EDE3-CBC,", 23 ) == 0 )
if( s2 - s1 >= 23 && memcmp( s1, "DEK-Info: DES-EDE3-CBC,", 23 ) == 0 )
{
enc_alg = MBEDTLS_CIPHER_DES_EDE3_CBC;
s1 += 23;
if( pem_get_iv( s1, pem_iv, 8 ) != 0 )
if( s2 - s1 < 16 || pem_get_iv( s1, pem_iv, 8 ) != 0 )
return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
s1 += 16;
}
else if( memcmp( s1, "DEK-Info: DES-CBC,", 18 ) == 0 )
else if( s2 - s1 >= 18 && memcmp( s1, "DEK-Info: DES-CBC,", 18 ) == 0 )
{
enc_alg = MBEDTLS_CIPHER_DES_CBC;
s1 += 18;
if( pem_get_iv( s1, pem_iv, 8) != 0 )
if( s2 - s1 < 16 || pem_get_iv( s1, pem_iv, 8) != 0 )
return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
s1 += 16;
@ -285,9 +285,11 @@ int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const
#endif /* MBEDTLS_DES_C */
#if defined(MBEDTLS_AES_C)
if( memcmp( s1, "DEK-Info: AES-", 14 ) == 0 )
if( s2 - s1 >= 14 && memcmp( s1, "DEK-Info: AES-", 14 ) == 0 )
{
if( memcmp( s1, "DEK-Info: AES-128-CBC,", 22 ) == 0 )
if( s2 - s1 < 22 )
return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
else if( memcmp( s1, "DEK-Info: AES-128-CBC,", 22 ) == 0 )
enc_alg = MBEDTLS_CIPHER_AES_128_CBC;
else if( memcmp( s1, "DEK-Info: AES-192-CBC,", 22 ) == 0 )
enc_alg = MBEDTLS_CIPHER_AES_192_CBC;
@ -297,7 +299,7 @@ int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const
return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
s1 += 22;
if( pem_get_iv( s1, pem_iv, 16 ) != 0 )
if( s2 - s1 < 32 || pem_get_iv( s1, pem_iv, 16 ) != 0 )
return( MBEDTLS_ERR_PEM_INVALID_ENC_IV );
s1 += 32;
@ -316,7 +318,7 @@ int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const
( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
}
if( s1 == s2 )
if( s1 >= s2 )
return( MBEDTLS_ERR_PEM_INVALID_DATA );
ret = mbedtls_base64_decode( NULL, 0, &len, s1, s2 - s1 );

3
library/ssl_tls.c
View file

@ -7653,8 +7653,7 @@ int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md )
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
#if defined(MBEDTLS_MD5_C)
case MBEDTLS_SSL_HASH_MD5:
ssl->handshake->calc_verify = ssl_calc_verify_tls;
break;
return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
#endif
#if defined(MBEDTLS_SHA1_C)
case MBEDTLS_SSL_HASH_SHA1:

9
tests/suites/test_suite_pem.data
View file

@ -15,3 +15,12 @@ mbedtls_pem_write_buffer:"-----START TEST-----\n":"-----END TEST-----\n":"000102
PEM write (exactly two lines + 1)
mbedtls_pem_write_buffer:"-----START TEST-----\n":"-----END TEST-----\n":"000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F00":"-----START TEST-----\nAAECAwQFBgcICQoLDA0ODwABAgMEBQYHCAkKCwwNDg8AAQIDBAUGBwgJCgsMDQ4P\nAAECAwQFBgcICQoLDA0ODwABAgMEBQYHCAkKCwwNDg8AAQIDBAUGBwgJCgsMDQ4P\nAA==\n-----END TEST-----\n"
PEM read (DES-EDE3-CBC + invalid iv)
mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-EDE3-CBC,00$":-4608
PEM read (DES-CBC + invalid iv)
mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-CBC,00$":-4608
PEM read (unknown encryption algorithm)
mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-,00$":-4736

24
tests/suites/test_suite_pem.function
View file

@ -3,12 +3,7 @@
#include "mbedtls/pem.h"
/* END_HEADER */
/* BEGIN_DEPENDENCIES
* depends_on:MBEDTLS_PEM_WRITE_C
* END_DEPENDENCIES
*/
/* BEGIN_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_PEM_WRITE_C */
void mbedtls_pem_write_buffer( char *start, char *end, char *buf_str, char *result_str )
{
unsigned char buf[5000];
@ -38,3 +33,20 @@ exit:
mbedtls_free( check_buf );
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_AES_C:MBEDTLS_DES_C:MBEDTLS_MD5_C:MBEDTLS_CIPHER_MODE_CBC */
void mbedtls_pem_read_buffer( char *header, char *footer, char *data, int ret )
{
mbedtls_pem_context ctx;
size_t use_len = 0;
mbedtls_pem_init( &ctx );
TEST_ASSERT( mbedtls_pem_read_buffer( &ctx, header, footer,
(const unsigned char *)data, NULL, 0,
&use_len ) == ret );
exit:
mbedtls_pem_free( &ctx );
}
/* END_CASE */