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#---------------------------------------------------------------------------
# @(#)$Id$
#title          :/etc/haproxy/haproxy.cfg
#description    :ftmon cluster haproxy config. NGINX and XtraDB Cluster backend
#author         :Danny W Sheehan
#date           :July 2014
#website        :ftmon.org
#
# This is a work in progress. A lot of trial and error and man hours have
# gone into this configuration. I have referenced sources that have been
# helpful.
#
# ftmon cluster is tuned for KVM with 1G of memory and 1 cpu.
#
# Final configuration will be available at https://github.com/ftmon as
# opensource.
#---------------------------------------------------------------------------

global
  # just turn this on when you need to do debugging
  log /dev/log local7

  user haproxy
  group haproxy
  daemon
  #debug
  #quiet

  ulimit-n   65536

  # Distribute the health checks with a bit of randomness
  spread-checks 5

  # access for monitoring by nagios or by other tools
  stats socket /var/run/haproxy.stat mode 777

defaults

  # apply log settings from the global section above to services
  log global

  # http://haproxy.1wt.eu/download/1.3/examples/antidos.cfg
  maxconn 2000

  # Don't queue requests too long if we get saturaed with a DOs
  timeout queue   5s

  timeout tarpit  1m
  
    # https://www.twilio.com/engineering/2013/10/16/haproxy
  # If sending request to one server fails, then try another before failing.
  retries 1
  # Don't enforce sessions affinity. Requests can be served by any backend
  # not just the one that started it.
  option redispatch

  # Must match the longest time we must wait for a response from the server.
  # since our backends may be on different servers it is set quite large.
  timeout connect 63s

  # wordpress and other software installs can take time.
  timeout server  500s

  # time you let a client to send it's request
  # some people set pretty low
  timeout client  30s


  # Good notes below on errorfile
  # http://www.kloppmagic.ca/load-balancing-with-haproxy/

  errorfile 400 /etc/haproxy/errors/400.http

  # Show "Not Found" 404 errors in place of "Forbidden" 403 errors, because
  # forbidden errors allow attackers potential insight into your server's
  # configuration and contents.
  errorfile 403 /etc/haproxy/errors/404.http

  # chrome bug from May 2014. It may be since fixed.
  # http://blog.haproxy.com/2014/05/26/haproxy-and-http-errors-408-in-chrome/
  errorfile 408 /dev/null

  errorfile 500 /etc/haproxy/errors/500.http
  errorfile 502 /etc/haproxy/errors/502.http
  errorfile 503 /etc/haproxy/errors/503.http
  errorfile 504 /etc/haproxy/errors/504.http

frontend www
  bind ${LB1}:80

  # option accept-invalid-http-request

  # https://community.qualys.com/blogs/securitylabs/2011/10/17/mitigating-the-beast-attack-on-tls
  bind ${LB1}:443 ssl crt /etc/haproxy/default.pem crt /etc/haproxy/certs.d ciphers ECDHE-RSA-AES256-SHA:RC4-SHA:RC4:HIGH:!MD5:!aNULL:!EDH:!AESGCM
  # no-sslv3 ?
  # no-tls-tickets ?

  mode        http
  option      httplog

  # do not log requests with no data
  option      dontlognull


  monitor-uri  /haproxy-test
  maxconn     2000

  # http://blog.killtheradio.net/technology/haproxys-keep-alive-functionality-and-how-it-can-speed-up-your-site/
  option   http-server-close
  timeout  http-keep-alive 5s

  # Thwart Slowloris like attacks
  # http://blog.exceliance.fr/2012/02/27/use-a-load-balancer-as-a-first-row-of-defense-against-ddos/
  #timeout  http-request 5s
  timeout  http-request 7s
  # http://serverfault.com/questions/291467/haproxy-badreq-errors
  # timeout  http-request 20s

  # support for 'X-Forwarded-For: IP'
  option      forwardfor except 127.0.0.1

  # useful for tracking requests in logs.
  capture request  header Host           len 30
  capture request  header User-Agent     len 30
  capture request  header Content-Length len 10
  capture request  header Referer        len 20

  # http-request deny any unwanted source IP addresses or networks
  #  acl forbidden_src src      0.0.0.0/7 224.0.0.0/3
  #  acl forbidden_src src_port 0:1023
  #  http-request deny if forbidden_src

  # ... some HTTP content smugling and other various things
  acl forbidden_hdrs hdr_cnt(host) gt 1
  acl forbidden_hdrs hdr_cnt(content-length) gt 1
  acl forbidden_hdrs hdr_val(content-length) lt 0
  acl forbidden_hdrs hdr_cnt(proxy-authorization) gt 0
  http-request deny if forbidden_hdrs


  #
  # http-request deny requests to "*" URL with methods other than "OPTIONS" in
  # addition to POST requests without content-length
  acl missing_cl hdr_cnt(Content-length) eq 0
  http-request deny if HTTP_URL_STAR !METH_OPTIONS || METH_POST missing_cl

  # http-request deny if GET with content.
  http-request deny if METH_GET HTTP_CONTENT

  # http-request deny unless GET/HEAD/POST/OPTIONS request
  # http-request deny unless METH_GET or METH_POST or METH_OPTIONS

  # http-request deny requests to domains we don't host.
  acl valid_domains  hdr_end(host) -i -f /etc/haproxy/valid_domains.lst

  # where you login from.
  acl mgmt_src   src -f /etc/haproxy/whitelist.lst

  # stuff you don't want others to access.
  acl adminurls  url_sub -i -f /etc/haproxy/adminurls.lst

  # domains you don't want others to access.
  acl admin_domains  hdr_end(host) -i -f /etc/haproxy/admin_domains.lst

  # IP's you don't trust.
  acl badguys   src -f /etc/haproxy/badguys.lst

  # domains you want to allow login access to. e.g. forums.
  acl forum_domains    hdr_end(host) -i -f /etc/haproxy/forum_domains.lst

  # urls that allow login.
  acl loginurls url_beg -f /etc/haproxy/loginurls.lst

  # only allow admin access from admin desktop to admin websites
  http-request deny if !mgmt_src admin_domains


  # if we don't host the domain we deny it.
  http-request deny if !valid_domains !admin_domains

  # allow legitimate access
  #   -  management urls accessible only from management workstations
  http-request deny if adminurls !mgmt_src

  #   - login urls accessible only to forum domains and management workstations
  http-request deny if loginurls !forum_domains !mgmt_src


  #
  # http-request deny ip address ranges you deem as bad guys
  #
  http-request deny if badguys


  #
  # stop bad bots and spiders
  #
  acl badbots hdr_reg(User-Agent) -i -f /etc/haproxy/badbots.lst

  http-request deny if !mgmt_src badbots

  #
  # stop bad referers
  #
  acl badreferer hdr_sub(referer) -i -f /etc/haproxy/badreferer.lst

  http-request deny if !mgmt_src badreferer


  # insert certificate information ?
  # This example config sends all available certificate details to your backend application as HTTP Headers: 
  # https://raymii.org/s/tutorials/haproxy_client_side_ssl_certificates.html
  # The {+Q} means that the data is quoted as a string. Otherwise it would be binary or boolean.

 # log-format %ci:%cp\ [%t]\ %ft\ %b/%s\ %Tq/%Tw/%Tc/%Tr/%Tt\ %ST\ %B\ %CC\ %CS\ %tsc\ %ac/%fc/%bc/%sc/%rc\ %sq/%bq\ %hr\ %hs\ {%[ssl_c_verify],%{+Q}[ssl_c_s_dn],%{+Q}[ssl_c_i_dn]}\ %{+Q}r
  http-request set-header X-SSL                  %[ssl_fc]
  http-request set-header X-SSL-Client-Verify    %[ssl_c_verify]
  http-request set-header X-SSL-Client-DN        %{+Q}[ssl_c_s_dn]
  http-request set-header X-SSL-Client-CN        %{+Q}[ssl_c_s_dn(cn)]
  http-request set-header X-SSL-Issuer           %{+Q}[ssl_c_i_dn]
  http-request set-header X-SSL-Client-NotBefore %{+Q}[ssl_c_notbefore]
  http-request set-header X-SSL-Client-NotAfter  %{+Q}[ssl_c_notafter]


  # https://gist.github.com/rnewson/8384304
  # https://raymii.org/s/snippets/haproxy_add_strict_transport_security_or_any_other_http_header.html
  # http://www.debian-administration.org/article/662/Enabling_HTTP_Strict_Transport_Security_on_debian_servers
  #  https://www.owasp.org/index.php/HTTP_Strict_Transport_Security
  # rspadd Strict-Transport-Security:\ max-age=31536000;\ includeSubDomains if { ssl_fc }

  # https://raymii.org/s/tutorials/haproxy_intercept_all_cookies_and_set_secure_attribute.html
  #rspirep ^(set-cookie:.*)  \1;\ Secure if { ssl_fc }

  reqadd X-Forwarded-Proto:\ https if { ssl_fc }
  reqadd X-Proto:\ SSL if { ssl_fc }


  # hide what type of server and software we run.
  rspidel         ^Server:\
  rspadd          Server:\ ftmon.org\ cluster


  # Only allow hastats to be visible from admin hosts not from website domains.
  acl hastatsurl  url_sub -i /haproxy
  use_backend  hastats if hastatsurl admin_domains

  use_backend  adminsrv if { ssl_fc }

  acl cron url_beg /wp-cron.php /wp-admin/admin-ajax.php?action=wp_multisite_cron_call
  use_backend  adminsrv if cron

  acl static_domains hdr_end(host) -i -f /etc/haproxy/staticsite_domains.lst
  use_backend static if static_domains

  default_backend www


backend adminsrv
  mode http
  # option accept-invalid-http-response
  option abortonclose
  option httplog
  balance roundrobin
  server admin 127.0.0.1:8080

backend hastats
  mode http
  stats enable
  stats scope http
  stats scope www  
  stats scope static
  stats scope mysql
  stats scope https
  stats scope adminsrv
  stats hide-version
  stats uri /haproxy

backend static
  mode http  
  option abortonclose
  option httpchk
  option httplog
  balance roundrobin
  server static1 127.0.0.1:8080

backend www
option accept-invalid-http-response
  mode http
  option abortonclose
  option httplog
  balance roundrobin
  server php1 127.0.0.1:8080
  #option httpchk GET /checkserver.php HTTP/1.1\r\nHost:\ localhost
  #server php2 127.0.2.2:8080 check port 80 inter 7000 fastinter 2000 rise 3 fall 3
  #server php3 127.0.2.3:8080 check port 80 inter 12000 fastinter 2000 rise 3 fall 3 backup

#backend spdy_srv
#  server speed1 127.0.0.1:80

#backend discourse
#  mode http
#  option abortonclose
#  option httplog

listen mysql 127.0.0.1:3306
  mode tcp
  balance roundrobin
  option httpchk
  server lb1 ${LB1}:3306 check addr ${LB1} port 9200 inter 6000 fastinter 2000 rise 2 fall 2
  server lb2 ${LB2}:3306 check addr ${LB2} port 9200 inter 11000 fastinter 2000 rise 2 fall 2 backup
  server lb3 ${LB3}:3306 check addr ${LB3} port 9200 inter 11000 fastinter 2000 rise 2 fall 2 backup