haproxy multihost with ssl acl

You can actually do this with your version of haproxy. I've blogged about it here

Here's the example:

global
   log 127.0.0.1  local0
   log 127.0.0.1  local1 notice
   #log loghost   local0 info
   maxconn 4096
   # chroot /usr/share/haproxy
   user haproxy
   group haproxy
   daemon
   #debug
   #quiet

defaults
   log   global
   mode  http
   option   httplog
   option   dontlognull
   retries  3
   option redispatch
   maxconn  2000
   contimeout  5000
   clitimeout  50000
   srvtimeout  50000

# Host HA-Proxy web stats on Port 3306 (that will confuse those script kiddies)
listen HAProxy-Statistics *:3306
    mode http
    option httplog
    option httpclose
    stats enable
    stats uri /haproxy?stats
    stats refresh 20s
    stats show-node
    stats show-legends
    stats show-desc Workaround haproxy for SSL
    stats auth admin:ifIruledTheWorld
    stats admin if TRUE

frontend ssl_relay 192.168.128.21:443
    # this only works with 1.5 haproxy
    mode tcp
    option tcplog
    option socket-stats
    # option nolinger
    maxconn  300

    # use tcp content accepts to detects ssl client and server hello.
    # acl clienthello req_ssl_hello_type 1 -> seems to not work

    tcp-request inspect-delay 5s
    tcp-request content accept if { req_ssl_hello_type 1 }

    use_backend ssl_testdomain_prod if { req_ssl_sni -i www.testdomain.nl }
    use_backend ssl_testdomain_stag if { req_ssl_sni -i test.testdomain.nl }

    default_backend ssl_testdomain_stag

backend ssl_testdomain_stag
   mode tcp
   #option nolinger
   option tcplog
   balance roundrobin
   hash-type consistent
   option srvtcpka

    # maximum SSL session ID length is 32 bytes.
    stick-table type binary len 32 size 30k expire 30m

    # make sure we cover type 1 (fallback)
    acl clienthello req_ssl_hello_type 1
    acl serverhello rep_ssl_hello_type 2

    # use tcp content accepts to detects ssl client and server hello.
    tcp-request inspect-delay 5s
    tcp-request content accept if clienthello

    # no timeout on response inspect delay by default.
    tcp-response content accept if serverhello

    # SSL session ID (SSLID) may be present on a client or server hello.
    # Its length is coded on 1 byte at offset 43 and its value starts
    # at offset 44.
    # Match and learn on request if client hello.
    stick on payload_lv(43,1) if clienthello

    # Learn on response if server hello.
    stick store-response payload_lv(43,1) if serverhello

    #option ssl-hello-chk

    server x_testdomain_stag 123.123.123.123:443


backend ssl_testdomain_prod
   mode tcp
   #option nolinger
   option tcplog
   balance roundrobin
   hash-type consistent
   option srvtcpka

    # maximum SSL session ID length is 32 bytes.
    stick-table type binary len 32 size 30k expire 30m

    # make sure we cover type 1 (fallback)
    acl clienthello req_ssl_hello_type 1
    acl serverhello rep_ssl_hello_type 2

    # use tcp content accepts to detects ssl client and server hello.
    tcp-request inspect-delay 5s
    tcp-request content accept if clienthello

    # no timeout on response inspect delay by default.
    tcp-response content accept if serverhello

    # SSL session ID (SSLID) may be present on a client or server hello.
    # Its length is coded on 1 byte at offset 43 and its value starts
    # at offset 44.
    # Match and learn on request if client hello.
    stick on payload_lv(43,1) if clienthello

    # Learn on response if server hello.
    stick store-response payload_lv(43,1) if serverhello

    #option ssl-hello-chk

    server x_testdomain_prod 123.123.111.111:443

This example implies that you terminate your SSL on the webserver backends, I haven't tried to do this with haproxy ssl termination yet.

If that is what you want, maybe this example helps getting it to work.

there is another example that uses use_server instead of use_backend here

I don't think haproxy will allow you to specify a per-backend SSL certificate for each incoming request, rather you'd have to have a combined certificate that allows for multiple domain names (SNI).

Here's a guide on using SNI with haproxy, where all the certificates are actually hosted by the haproxy server, not the backend instances: https://trick77.com/haproxy-and-sni-based-ssl-offloading-with-intermediate-ca/

Also see the example at the end of this section: http://cbonte.github.io/haproxy-dconv/configuration-1.5.html#4.2-use-server