Re: Patch for TLS 1.2 DHE* cipher support in uwimap/panda?
"Erik Kangas, Ph.D." <[email protected]> Wed, 05 Apr 2017 22:23:41 +0000
| Newsgroups | gmane.mail.imap.uw.c-client |
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This is a multi-part message in MIME format. If you cannot view the attachment(s), then your email client does not support MIME. --------------------_Boundary_19576306.3193137 Content-Type: multipart/alternative; boundary="-------------7346480.0729614" ---------------7346480.0729614 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable Thanks. We already pre-generate the DH parameters for sendmail and have them=20 sitting around in a dhparms.pem file unique to the server. I wonder if=20 anyone has created a patch that allows UW IMAP to read such a file and=20 supply the parameters? -Erik Kangas On April 5, 2017 06:07:15 pm EDT, "Dan Lukes" <[email protected]> wrote: Erik Kangas, Ph.D. wrote: > Has anyone found a way to get the Diffie Hellman TLS v1.2 ciphers (e.g. > DHE-RSA-AES256-GCM-SHA384) to work with UW IMAP / Panda IMAP? In order to perform a DH key exchange the server must use a DH group (DH parameters) and generate a DH key. UW IMAP neither generate DH parameters on the fly nor supply the parameters - thus no DHE can be negotiated. You may patch the code and use SSL_CTX_set_options(3) to set SSL_OP_SINGLE_DH_USE option, but generating DH parameters on the fly is extremely time consuming. Dan ---------------7346480.0729614 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML> <HTML> <HEAD><meta http-equiv=3D"content-type" content=3D"text/html; charset=3DUTF= -8"></HEAD> <BODY style=3D"padding:5px; line-height: 1.3em; font-size: 14px; color: #33= 3; background-color: #FFF; font-family: Arial, Helvetica, sans-serif"> <div> <div>Thanks.<br /> <br /> We already pre-generate the DH parameters for sendmail and have them sittin= g around in a dhparms.pem file unique to the server. I wonder if anyo= ne has created a patch that allows UW IMAP to read such a file and supply t= he parameters?<br /> <br /> -Erik Kangas</div> </div> <div style=3D"padding:3px 0 3px 0;border-top:1px solid #DDD; border-bottom:= 1px solid #DDD;margin:3px 0 3px 0">On April 5, 2017 06:07:15 pm EDT, "= ;Dan Lukes" <[email protected]> wrote:</div> <br /> <br /> Erik Kangas, Ph.D. wrote:<br /> > Has anyone found a way to get the Diffie Hellman TLS v1.2 ciphers (e.g= .<br /> > DHE-RSA-AES256-GCM-SHA384) to work with UW IMAP / Panda IMAP?<br /> <br /> In order to perform a DH key exchange the server must use a DH group (DH<br= /> parameters) and generate a DH key.<br /> <br /> UW IMAP neither generate DH parameters on the fly nor supply the<br /> parameters - thus no DHE can be negotiated.<br /> <br /> You may patch the code and use SSL_CTX_set_options(3) to set<br /> SSL_OP_SINGLE_DH_USE option, but generating DH parameters on the fly is<br = /> extremely time consuming.<br /> <br /> <br /> Dan<br /> </BODY> </HTML> ---------------7346480.0729614-- --------------------_Boundary_19576306.3193137 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Imap-uw mailing list [email protected] http://mailman13.u.washington.edu/mailman/listinfo/imap-uw --------------------_Boundary_19576306.3193137--