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Add documentation warnings for weak algorithms

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MD2, MD4, MD5, DES and SHA-1 are considered weak and their use
constitutes a security risk. If possible, we recommend avoiding
dependencies on them, and considering stronger message digests and
ciphers instead.
This commit is contained in:
Hanno Becker
2017-09-25 14:53:51 +01:00
committed by Jaeden Amero
parent 3b8fbaab87
commit bbca8c5d3c
9 changed files with 482 additions and 5 deletions
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64
include/mbedtls/config.h
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@@ -262,6 +262,12 @@
*
* Uncomment a macro to enable alternate implementation of the corresponding
* module.
*
* \warning MD2, MD4, MD5, ARC4, DES and SHA-1 are considered weak and their
* use constitutes a security risk. If possible, we recommend
* avoiding dependencies on them, and considering stronger message
* digests and ciphers instead.
*
*/
//#define MBEDTLS_AES_ALT
//#define MBEDTLS_ARC4_ALT
@@ -321,6 +327,12 @@
*
* Uncomment a macro to enable alternate implementation of the corresponding
* function.
*
* \warning MD2, MD4, MD5, DES and SHA-1 are considered weak and their use
* constitutes a security risk. If possible, we recommend avoiding
* dependencies on them, and considering stronger message digests
* and ciphers instead.
*
*/
//#define MBEDTLS_MD2_PROCESS_ALT
//#define MBEDTLS_MD4_PROCESS_ALT
@@ -525,6 +537,9 @@
* MBEDTLS_TLS_DHE_RSA_WITH_DES_CBC_SHA
*
* Uncomment this macro to enable weak ciphersuites
*
* \warning DES is considered a weak cipher and its use constitutes a
* security risk. We recommend considering stronger ciphers instead.
*/
//#define MBEDTLS_ENABLE_WEAK_CIPHERSUITES
@@ -1615,6 +1630,11 @@
* MBEDTLS_TLS_RSA_WITH_RC4_128_MD5
* MBEDTLS_TLS_RSA_PSK_WITH_RC4_128_SHA
* MBEDTLS_TLS_PSK_WITH_RC4_128_SHA
*
* \warning ARC4 is considered a weak cipher and its use constitutes a
* security risk. If possible, we recommend avoidng dependencies on
* it, and considering stronger ciphers instead.
*
*/
#define MBEDTLS_ARC4_C
@@ -1841,6 +1861,9 @@
* MBEDTLS_TLS_PSK_WITH_3DES_EDE_CBC_SHA
*
* PEM_PARSE uses DES/3DES for decrypting encrypted keys.
*
* \warning DES is considered a weak cipher and its use constitutes a
* security risk. We recommend considering stronger ciphers instead.
*/
#define MBEDTLS_DES_C
@@ -2020,6 +2043,11 @@
* Caller:
*
* Uncomment to enable support for (rare) MD2-signed X.509 certs.
*
* \warning MD2 is considered a weak message digest and its use constitutes a
* security risk. If possible, we recommend avoiding dependencies on
* it, and considering stronger message digests instead.
*
*/
//#define MBEDTLS_MD2_C
@@ -2032,6 +2060,11 @@
* Caller:
*
* Uncomment to enable support for (rare) MD4-signed X.509 certs.
*
* \warning MD4 is considered a weak message digest and its use constitutes a
* security risk. If possible, we recommend avoiding dependencies on
* it, and considering stronger message digests instead.
*
*/
//#define MBEDTLS_MD4_C
@@ -2045,8 +2078,15 @@
* library/pem.c
* library/ssl_tls.c
*
* This module is required for SSL/TLS and X.509.
* PEM_PARSE uses MD5 for decrypting encrypted keys.
* This module is required for SSL/TLS up to version 1.1, and for TLS 1.2
* depending on the handshake parameters. Further, it is used for checking
* MD5-signed certificates, and for PBKDF1 when decrypting PEM-encoded
* encrypted keys.
*
* \warning MD5 is considered a weak message digest and its use constitutes a
* security risk. If possible, we recommend avoiding dependencies on
* it, and considering stronger message digests instead.
*
*/
#define MBEDTLS_MD5_C
@@ -2309,6 +2349,11 @@
*
* This module is required for SSL/TLS up to version 1.1, for TLS 1.2
* depending on the handshake parameters, and for SHA1-signed certificates.
*
* \warning SHA-1 is considered a weak message digest and its use constitutes
* a security risk. If possible, we recommend avoiding dependencies
* on it, and considering stronger message digests instead.
*
*/
#define MBEDTLS_SHA1_C
@@ -2697,8 +2742,13 @@
* Allow SHA-1 in the default TLS configuration for certificate signing.
* Without this build-time option, SHA-1 support must be activated explicitly
* through mbedtls_ssl_conf_cert_profile. Turning on this option is not
* recommended because of it is possible to generte SHA-1 collisions, however
* recommended because of it is possible to generate SHA-1 collisions, however
* this may be safe for legacy infrastructure where additional controls apply.
*
* \warning SHA-1 is considered a weak message digest and its use constitutes
* a security risk. If possible, we recommend avoiding dependencies
* on it, and considering stronger message digests instead.
*
*/
// #define MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_CERTIFICATES
@@ -2709,7 +2759,13 @@
* The use of SHA-1 in TLS <= 1.1 and in HMAC-SHA-1 is always allowed by
* default. At the time of writing, there is no practical attack on the use
* of SHA-1 in handshake signatures, hence this option is turned on by default
* for compatibility with existing peers.
* to preserve compatibility with existing peers, but the general
* warning applies nonetheless:
*
* \warning SHA-1 is considered a weak message digest and its use constitutes
* a security risk. If possible, we recommend avoiding dependencies
* on it, and considering stronger message digests instead.
*
*/
#define MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE