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<p class="MsoNormal">Dear Openssl Gurus,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am facing the following problem, I am required to create an SSL client that talks (TLSv1.2, TLSv1.1 and TLSv1.0) against 3 different types of servers, one talks TLSv1.2 only (server_12) , one TLSv1.1 only (server_11) and one TLSv1.0
only (server_10)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The way I am configuring my tls context is as following<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><u>Note: I am using Openssl v1.0.2l<o:p></o:p></u></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;background:white;mso-highlight:white">SSL_CTX</span><span style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white"> *ctx;</span><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">ctx = SSL_CTX_new( SSLv23_method()</span><span style="font-size:9.5pt;font-family:Consolas;color:black"> )<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:#6F008A;background:white;mso-highlight:white">SSL_CTX_set_options</span><span style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">(ctx,</span><span style="font-size:9.5pt;font-family:Consolas;color:#6F008A;background:white;mso-highlight:white">SSL_OP_NO_SSLv3
| SSL_OP_NO_TICKET</span><span style="font-size:9.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">);</span><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Now…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">When I try to connect to server_10 I see the trace below, the negotiation fails with:<b><o:p></o:p></b></span></p>
<p class="MsoNormal" style="text-indent:.5in"><b><span style="font-size:9.5pt;font-family:Consolas;color:black">Alert Message<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:9.5pt;font-family:Consolas;color:black"> Level: Fatal (2)<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:9.5pt;font-family:Consolas;color:black"> Description: Protocol Version (70)<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">It makes sense, since the decription for this failure is:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="margin-left:.1pt;border-collapse:collapse">
<tbody>
<tr>
<td width="23" style="width:17.5pt;border:none;border-left:solid windowtext 1.0pt;padding:0in 2.25pt 0in 2.25pt">
<p class="MsoNormal">70<o:p></o:p></p>
</td>
<td width="122" style="width:91.5pt;border:none;border-right:solid windowtext 1.0pt;padding:0in 2.25pt 0in 2.25pt">
<p class="MsoNormal">protocol_version<o:p></o:p></p>
</td>
<td width="477" style="width:358.0pt;border:none;border-right:solid windowtext 1.0pt;padding:0in 2.25pt 0in 2.25pt">
<p class="MsoNormal">The protocol version the client attempted to negotiate is recognized, but not supported. For example, old protocol versions might be avoided for security reasons. This message is always fatal.<o:p></o:p></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif">Now my question is:<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif"><o:p> </o:p></span></p>
<pre style="mso-line-height-alt:0pt"><span style="font-family:"Segoe UI",sans-serif;background:yellow;mso-highlight:yellow">How do I configure my SSL_CTX options so that I can talk to server_10 whilst being able to connect to server_12 and server_11 and at the same time maintaining security and not becoming vulnerable to RFC7507 ( </span><span style="color:black;background:yellow;mso-highlight:yellow">TLS Fallback Signaling Cipher Suite Value (SCSV)</span><span style="color:black;background:yellow;mso-highlight:yellow"> for Preventing Protocol Downgrade Attacks)</span><o:p></o:p></pre>
<p class="MsoNormal" style="text-autospace:none"><b><o:p> </o:p></b></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Thank you in advance for your help!!!
</span><span style="font-size:9.5pt;font-family:Wingdings;color:black">J</span><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">-Ariel Silverman<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Wireshark Trace of TLS negotiation:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">===================================<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">No. Time Source Destination Protocol Length Info<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> 517 35.593453 192.168.0.70 192.168.0.102 TLSv1 249 Client Hello<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Frame 517: 249 bytes on wire (1992 bits), 249 bytes captured (1992 bits) on interface 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Ethernet II, Src: Vmware_e4:ae:09 (00:0c:29:e4:ae:09), Dst: Dell_c0:9a:2e (b8:ca:3a:c0:9a:2e)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Internet Protocol Version 4, Src: 192.168.0.70, Dst: 192.168.0.102<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Transmission Control Protocol, Src Port: 63441, Dst Port: 16993, Seq: 1, Ack: 1, Len: 195<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Secure Sockets Layer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> TLSv1 Record Layer: Handshake Protocol: Client Hello<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Content Type: Handshake (22)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Version: TLS 1.0 (0x0301)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Length: 190<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Handshake Protocol: Client Hello<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Handshake Type: Client Hello (1)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Length: 186<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Version: TLS 1.1 (0x0302)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Random: cdf0b0cb59d22675e6f840363eed6481674ce6e8714eeb45...<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Session ID Length: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Cipher Suites Length: 100<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Cipher Suites (50 suites)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Compression Methods Length: 1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Compression Methods (1 method)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Extensions Length: 45<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Extension: ec_point_formats (len=4)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Extension: supported_groups (len=28)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Extension: heartbeat (len=1)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">No. Time Source Destination Protocol Length Info<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> 519 35.595600 192.168.0.102 192.168.0.70 TLSv1 1063 Server Hello, Certificate, Certificate Request, Server Hello Done<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Frame 519: 1063 bytes on wire (8504 bits), 1063 bytes captured (8504 bits) on interface 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Ethernet II, Src: Dell_c0:9a:2e (b8:ca:3a:c0:9a:2e), Dst: Vmware_e4:ae:09 (00:0c:29:e4:ae:09)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Internet Protocol Version 4, Src: 192.168.0.102, Dst: 192.168.0.70<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Transmission Control Protocol, Src Port: 16993, Dst Port: 63441, Seq: 1, Ack: 196, Len: 1009<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Secure Sockets Layer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> TLSv1 Record Layer: Handshake Protocol: Server Hello<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Content Type: Handshake (22)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Version: TLS 1.0 (0x0301)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Length: 46<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Handshake Protocol: Server Hello<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Handshake Type: Server Hello (2)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Length: 42<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Version: TLS 1.0 (0x0301)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Random: a0cb439203175bf9bb313ad516e0722288bd8d2b0ceb14f6...<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Session ID Length: 4<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Session ID: 79010000<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Cipher Suite: TLS_RSA_WITH_AES_256_CBC_SHA (0x0035)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Compression Method: null (0)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> TLSv1 Record Layer: Handshake Protocol: Certificate<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Content Type: Handshake (22)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Version: TLS 1.0 (0x0301)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Length: 931<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Handshake Protocol: Certificate<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Handshake Type: Certificate (11)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Length: 927<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Certificates Length: 924<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Certificates (924 bytes)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> TLSv1 Record Layer: Handshake Protocol: Certificate Request<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Content Type: Handshake (22)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Version: TLS 1.0 (0x0301)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Length: 8<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Handshake Protocol: Certificate Request<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Handshake Type: Certificate Request (13)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Length: 4<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Certificate types count: 1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Certificate types (1 type)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Distinguished Names Length: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> TLSv1 Record Layer: Handshake Protocol: Server Hello Done<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Content Type: Handshake (22)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Version: TLS 1.0 (0x0301)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Length: 4<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Handshake Protocol: Server Hello Done<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Handshake Type: Server Hello Done (14)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Length: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">No. Time Source Destination Protocol Length Info<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> 520 35.595660 192.168.0.70 192.168.0.102 TLSv1 61 Alert (Level: Fatal, Description: Protocol Version)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Frame 520: 61 bytes on wire (488 bits), 61 bytes captured (488 bits) on interface 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Ethernet II, Src: Vmware_e4:ae:09 (00:0c:29:e4:ae:09), Dst: Dell_c0:9a:2e (b8:ca:3a:c0:9a:2e)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Internet Protocol Version 4, Src: 192.168.0.70, Dst: 192.168.0.102<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Transmission Control Protocol, Src Port: 63441, Dst Port: 16993, Seq: 196, Ack: 1010, Len: 7<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black">Secure Sockets Layer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> TLSv1 Record Layer: Alert (Level: Fatal, Description: Protocol Version)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Content Type: Alert (21)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Version: TLS 1.0 (0x0301)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Length: 2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Alert Message<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Level: Fatal (2)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> Description: Protocol Version (70)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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