Você pode fazer isso com sua versão do haproxy. Eu escrevi sobre isso aqui
Veja o exemplo:
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
Este exemplo implica que você encerre seu SSL nos back-ends do servidor da Web, ainda não tentei fazer isso com a terminação haproxy ssl.
Se é isso o que você quer, talvez este exemplo ajude a fazê-lo funcionar.
há outro exemplo que usa use_server em vez de use_backend aqui