Date: Fri, 6 Mar 2015 15:58:10 -0800 From: Doug Hardie <bc979@lafn.org> To: "freebsd-questions@freebsd.org Questions" <freebsd-questions@freebsd.org> Subject: Re: OpenSSL Ciphers Message-ID: <B8A83AF6-B354-46E7-A736-64959C53CD66@lafn.org> In-Reply-To: <5347DC2D-AD6C-41A1-AEC7-A81C51F691B3@lafn.org> References: <5347DC2D-AD6C-41A1-AEC7-A81C51F691B3@lafn.org>
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> On 3 March 2015, at 23:21, Doug Hardie <bc979@lafn.org> wrote: >=20 > The default list of ciphers is quite extensive and includes some that = are apparently causing some potential security issues. I have a number = of applications that use OpenSSL and many don=E2=80=99t have the code to = restrict the list. Fixing all that would take quite a bit of work. = However, looking into /usr/include/openssl/ssl.h I find a definition for = the SSL_DEFAULT_CIPHER_LIST. The comments indicate that that list is = the one used when the application doesn=E2=80=99t specify anything. I = changed its definition to: >=20 > #define SSL_DEFAULT_CIPHER_LIST = "TLSv1+HIGH:!SSLv2:RC4+MEDIUM:!aNULL:!eNULL:!3DES:@STRENGTH: >=20 > However, s_connect will still create a connection with the export = ciphers. I tried adding !EXPORT to that list and it had no effect. Is = the definition actually used by openssl or is it just there for = documentation? Not hearing anything on this, I suspect it=E2=80=99s not very well = understood. I have started updating the various servers/clients that = use SSL/TLS. The one that has me completely stumped is sendmail. There = is a web page which provides instructions = "http://novosial.org/sendmail/cipherlist/index.html=E2=80=9D. However, = when I follow them, I can still establish a connection and deliver mail = using the export ciphers. =20 Has anyone successfully restricted the sendmail ciphers?=
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