Re: [TLS] DSA should die

Viktor Dukhovni <ietf-dane@dukhovni.org> Thu, 02 April 2015 00:26 UTC

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Date: Thu, 2 Apr 2015 00:26:46 +0000
From: Viktor Dukhovni <ietf-dane@dukhovni.org>
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Subject: Re: [TLS] DSA should die
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On Wed, Apr 01, 2015 at 08:12:21PM +0200, Hanno B?ck wrote:

> Mozilla just removed DSA support from Firefox. It seems the use of
> (non-ecc) DSA in TLS is pretty much nonexistent. Still the TLS 1.3 draft
> contains DSA.
> 
> Proposal: DSA should go away and not be part of TLS 1.3.

I'm in.  This also helps to shrink the ClientHello cipherlist zoo.

OpenSSL has (SRP, EXPORT and single-DES excluded):

    DHE-DSS-AES256-GCM-SHA384 TLSv1.2 Kx=DH Au=DSS Enc=AESGCM(256)   Mac=AEAD
    DHE-DSS-AES256-SHA256     TLSv1.2 Kx=DH Au=DSS Enc=AES(256)      Mac=SHA256
    DHE-DSS-AES256-SHA        SSLv3 Kx=DH   Au=DSS Enc=AES(256)      Mac=SHA1
    DHE-DSS-CAMELLIA256-SHA   SSLv3 Kx=DH   Au=DSS Enc=Camellia(256) Mac=SHA1
    DHE-DSS-AES128-GCM-SHA256 TLSv1.2 Kx=DH Au=DSS Enc=AESGCM(128)   Mac=AEAD
    DHE-DSS-AES128-SHA256     TLSv1.2 Kx=DH Au=DSS Enc=AES(128)      Mac=SHA256
    DHE-DSS-AES128-SHA        SSLv3 Kx=DH   Au=DSS Enc=AES(128)      Mac=SHA1
    DHE-DSS-CAMELLIA128-SHA   SSLv3 Kx=DH   Au=DSS Enc=Camellia(128) Mac=SHA1
    EDH-DSS-DES-CBC3-SHA      SSLv3 Kx=DH   Au=DSS Enc=3DES(168)     Mac=SHA1
    DHE-DSS-SEED-SHA          SSLv3 Kx=DH   Au=DSS Enc=SEED(128)     Mac=SHA1

Which can all go.  Speaking of house-cleaning, on my deprecation wish list
are also (pardon the OpenSSL nomenclature):

    DHE-RSA-SEED-SHA        SSLv3 Kx=DH       Au=RSA  Enc=SEED(128) Mac=SHA1
    DHE-DSS-SEED-SHA        SSLv3 Kx=DH       Au=DSS  Enc=SEED(128) Mac=SHA1
    DH-RSA-SEED-SHA         SSLv3 Kx=DH/RSA   Au=DH   Enc=SEED(128) Mac=SHA1
    DH-DSS-SEED-SHA         SSLv3 Kx=DH/DSS   Au=DH   Enc=SEED(128) Mac=SHA1
    ADH-SEED-SHA            SSLv3 Kx=DH       Au=None Enc=SEED(128) Mac=SHA1
    SEED-SHA                SSLv3 Kx=RSA      Au=RSA  Enc=SEED(128) Mac=SHA1
    IDEA-CBC-SHA            SSLv3 Kx=RSA      Au=RSA  Enc=IDEA(128) Mac=SHA1
    RC2-CBC-MD5             SSLv2 Kx=RSA      Au=RSA  Enc=RC2(128)  Mac=MD5
    EDH-RSA-DES-CBC-SHA     SSLv3 Kx=DH       Au=RSA  Enc=DES(56)   Mac=SHA1
    EDH-DSS-DES-CBC-SHA     SSLv3 Kx=DH       Au=DSS  Enc=DES(56)   Mac=SHA1
    DH-RSA-DES-CBC-SHA      SSLv3 Kx=DH/RSA   Au=DH   Enc=DES(56)   Mac=SHA1
    DH-DSS-DES-CBC-SHA      SSLv3 Kx=DH/DSS   Au=DH   Enc=DES(56)   Mac=SHA1
    ADH-DES-CBC-SHA         SSLv3 Kx=DH       Au=None Enc=DES(56)   Mac=SHA1
    DES-CBC-SHA             SSLv3 Kx=RSA      Au=RSA  Enc=DES(56)   Mac=SHA1

and exotic key agreement schemes with static DH certificates (some of which
appear above):

    DH-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=DH/RSA   Au=DH   Enc=AESGCM(256) Mac=AEAD
    DH-RSA-AES256-SHA256    TLSv1.2 Kx=DH/RSA   Au=DH   Enc=AES(256)  Mac=SHA256
    DH-RSA-AES256-SHA       SSLv3 Kx=DH/RSA   Au=DH   Enc=AES(256)  Mac=SHA1
    DH-RSA-CAMELLIA256-SHA  SSLv3 Kx=DH/RSA   Au=DH   Enc=Camellia(256) Mac=SHA1
    DH-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=DH/RSA   Au=DH   Enc=AESGCM(128) Mac=AEAD
    DH-RSA-AES128-SHA256    TLSv1.2 Kx=DH/RSA   Au=DH   Enc=AES(128)  Mac=SHA256
    DH-RSA-AES128-SHA       SSLv3 Kx=DH/RSA   Au=DH   Enc=AES(128)  Mac=SHA1
    DH-RSA-SEED-SHA         SSLv3 Kx=DH/RSA   Au=DH   Enc=SEED(128) Mac=SHA1
    DH-RSA-CAMELLIA128-SHA  SSLv3 Kx=DH/RSA   Au=DH   Enc=Camellia(128) Mac=SHA1
    DH-RSA-DES-CBC3-SHA     SSLv3 Kx=DH/RSA   Au=DH   Enc=3DES(168) Mac=SHA1
    DH-RSA-DES-CBC-SHA      SSLv3 Kx=DH/RSA   Au=DH   Enc=DES(56)   Mac=SHA1

    ECDH-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH/RSA Au=ECDH Enc=AESGCM(256) Mac=AEAD
    ECDH-RSA-AES256-SHA384  TLSv1.2 Kx=ECDH/RSA Au=ECDH Enc=AES(256)  Mac=SHA384
    ECDH-RSA-AES256-SHA     SSLv3 Kx=ECDH/RSA Au=ECDH Enc=AES(256)  Mac=SHA1
    ECDH-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH/RSA Au=ECDH Enc=AESGCM(128) Mac=AEAD
    ECDH-RSA-AES128-SHA256  TLSv1.2 Kx=ECDH/RSA Au=ECDH Enc=AES(128)  Mac=SHA256
    ECDH-RSA-AES128-SHA     SSLv3 Kx=ECDH/RSA Au=ECDH Enc=AES(128)  Mac=SHA1
    ECDH-RSA-RC4-SHA        SSLv3 Kx=ECDH/RSA Au=ECDH Enc=RC4(128)  Mac=SHA1
    ECDH-RSA-DES-CBC3-SHA   SSLv3 Kx=ECDH/RSA Au=ECDH Enc=3DES(168) Mac=SHA1
    ECDH-RSA-NULL-SHA       SSLv3 Kx=ECDH/RSA Au=ECDH Enc=None      Mac=SHA1

    ECDH-ECDSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH/ECDSA Au=ECDH Enc=AESGCM(256) Mac=AEAD
    ECDH-ECDSA-AES256-SHA384 TLSv1.2 Kx=ECDH/ECDSA Au=ECDH Enc=AES(256)  Mac=SHA384
    ECDH-ECDSA-AES256-SHA   SSLv3 Kx=ECDH/ECDSA Au=ECDH Enc=AES(256)  Mac=SHA1
    ECDH-ECDSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH/ECDSA Au=ECDH Enc=AESGCM(128) Mac=AEAD
    ECDH-ECDSA-AES128-SHA256 TLSv1.2 Kx=ECDH/ECDSA Au=ECDH Enc=AES(128)  Mac=SHA256
    ECDH-ECDSA-AES128-SHA   SSLv3 Kx=ECDH/ECDSA Au=ECDH Enc=AES(128)  Mac=SHA1
    ECDH-ECDSA-RC4-SHA      SSLv3 Kx=ECDH/ECDSA Au=ECDH Enc=RC4(128)  Mac=SHA1
    ECDH-ECDSA-DES-CBC3-SHA SSLv3 Kx=ECDH/ECDSA Au=ECDH Enc=3DES(168) Mac=SHA1
    ECDH-ECDSA-NULL-SHA     SSLv3 Kx=ECDH/ECDSA Au=ECDH Enc=None      Mac=SHA1

-- 
	Viktor.