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Merge pull request #1322 from came88/ssl-configuration

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Update ssl configuration
This commit is contained in:
Jason Wilder 2019-09-09 09:04:20 -06:00 committed by GitHub
commit 3a9de2d511
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2 changed files with 59 additions and 41 deletions
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18
README.md
View File

@ -252,18 +252,16 @@ and OCSP Stapling is enabled.
#### How SSL Support Works #### How SSL Support Works
The default SSL cipher configuration is based on the [Mozilla intermediate profile](https://wiki.mozilla.org/Security/Server_Side_TLS#Intermediate_compatibility_.28default.29) which The default SSL cipher configuration is based on the [Mozilla intermediate profile](https://wiki.mozilla.org/Security/Server_Side_TLS#Intermediate_compatibility_.28recommended.29) version 5.0 which
should provide compatibility with clients back to Firefox 1, Chrome 1, IE 7, Opera 5, Safari 1, should provide compatibility with clients back to Firefox 27, Android 4.4.2, Chrome 31, Edge, IE 11 on Windows 7,
Windows XP IE8, Android 2.3, Java 7. Note that the DES-based TLS ciphers were removed for security. Java 8u31, OpenSSL 1.0.1, Opera 20, and Safari 9. Note that the DES-based TLS ciphers were removed for security.
The configuration also enables HSTS, PFS, OCSP stapling and SSL session caches. Currently TLS 1.0, 1.1 and 1.2 The configuration also enables HSTS, PFS, OCSP stapling and SSL session caches. Currently TLS 1.2 and 1.3
are supported. TLS 1.0 is deprecated but its end of life is not until June 30, 2018. It is being are supported.
included because the following browsers will stop working when it is removed: Chrome < 22, Firefox < 27,
IE < 11, Safari < 7, iOS < 5, Android Browser < 5.
If you don't require backward compatibility, you can use the [Mozilla modern profile](https://wiki.mozilla.org/Security/Server_Side_TLS#Modern_compatibility) If you don't require backward compatibility, you can use the [Mozilla modern profile](https://wiki.mozilla.org/Security/Server_Side_TLS#Modern_compatibility)
profile instead by including the environment variable `SSL_POLICY=Mozilla-Modern` to your container. profile instead by including the environment variable `SSL_POLICY=Mozilla-Modern` to the nginx-proxy container or to your container.
This profile is compatible with clients back to Firefox 27, Chrome 30, IE 11 on Windows 7, This profile is compatible with clients back to Firefox 63, Android 10.0, Chrome 70, Edge 75, Java 11,
Edge, Opera 17, Safari 9, Android 5.0, and Java 8. OpenSSL 1.1.1, Opera 57, and Safari 12.1. Note that this profile is **not** compatible with any version of Internet Explorer.
Other policies available through the `SSL_POLICY` environment variable are [`Mozilla-Old`](https://wiki.mozilla.org/Security/Server_Side_TLS#Old_backward_compatibility) Other policies available through the `SSL_POLICY` environment variable are [`Mozilla-Old`](https://wiki.mozilla.org/Security/Server_Side_TLS#Old_backward_compatibility)
and the [AWS ELB Security Policies](https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-security-policy-table.html) and the [AWS ELB Security Policies](https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-security-policy-table.html)

82
nginx.tmpl
View File

@ -22,6 +22,49 @@
{{ end }} {{ end }}
{{ define "ssl_policy" }}
{{ if eq .ssl_policy "Mozilla-Modern" }}
ssl_protocols TLSv1.3;
{{/* nginx currently lacks ability to choose ciphers in TLS 1.3 in configuration, see https://trac.nginx.org/nginx/ticket/1529 /*}}
{{/* a possible workaround can be modify /etc/ssl/openssl.cnf to change it globally (see https://trac.nginx.org/nginx/ticket/1529#comment:12 ) /*}}
{{/* explicitly set ngnix default value in order to allow single servers to override the global http value */}}
ssl_ciphers HIGH:!aNULL:!MD5;
ssl_prefer_server_ciphers off;
{{ else if eq .ssl_policy "Mozilla-Intermediate" }}
ssl_protocols TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384';
ssl_prefer_server_ciphers off;
{{ else if eq .ssl_policy "Mozilla-Old" }}
ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA256:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA';
ssl_prefer_server_ciphers on;
{{ else if eq .ssl_policy "AWS-TLS-1-2-2017-01" }}
ssl_protocols TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:AES128-GCM-SHA256:AES128-SHA256:AES256-GCM-SHA384:AES256-SHA256';
ssl_prefer_server_ciphers on;
{{ else if eq .ssl_policy "AWS-TLS-1-1-2017-01" }}
ssl_protocols TLSv1.1 TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:AES128-GCM-SHA256:AES128-SHA256:AES128-SHA:AES256-GCM-SHA384:AES256-SHA256:AES256-SHA';
ssl_prefer_server_ciphers on;
{{ else if eq .ssl_policy "AWS-2016-08" }}
ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:AES128-GCM-SHA256:AES128-SHA256:AES128-SHA:AES256-GCM-SHA384:AES256-SHA256:AES256-SHA';
ssl_prefer_server_ciphers on;
{{ else if eq .ssl_policy "AWS-2015-05" }}
ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:AES128-GCM-SHA256:AES128-SHA256:AES128-SHA:AES256-GCM-SHA384:AES256-SHA256:AES256-SHA:DES-CBC3-SHA';
ssl_prefer_server_ciphers on;
{{ else if eq .ssl_policy "AWS-2015-03" }}
ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:AES128-GCM-SHA256:AES128-SHA256:AES128-SHA:AES256-GCM-SHA384:AES256-SHA256:AES256-SHA:DHE-DSS-AES128-SHA:DES-CBC3-SHA';
ssl_prefer_server_ciphers on;
{{ else if eq .ssl_policy "AWS-2015-02" }}
ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:AES128-GCM-SHA256:AES128-SHA256:AES128-SHA:AES256-GCM-SHA384:AES256-SHA256:AES256-SHA:DHE-DSS-AES128-SHA';
ssl_prefer_server_ciphers on;
{{ end }}
{{ end }}
# If we receive X-Forwarded-Proto, pass it through; otherwise, pass along the # If we receive X-Forwarded-Proto, pass it through; otherwise, pass along the
# scheme used to connect to this server # scheme used to connect to this server
map $http_x_forwarded_proto $proxy_x_forwarded_proto { map $http_x_forwarded_proto $proxy_x_forwarded_proto {
@ -65,6 +108,10 @@ log_format vhost '$host $remote_addr - $remote_user [$time_local] '
access_log off; access_log off;
{{/* Get the SSL_POLICY defined by this container, falling back to "Mozilla-Intermediate" */}}
{{ $ssl_policy := or ($.Env.SSL_POLICY) "Mozilla-Intermediate" }}
{{ template "ssl_policy" (dict "ssl_policy" $ssl_policy) }}
{{ if $.Env.RESOLVERS }} {{ if $.Env.RESOLVERS }}
resolver {{ $.Env.RESOLVERS }}; resolver {{ $.Env.RESOLVERS }};
{{ end }} {{ end }}
@ -109,6 +156,7 @@ server {
access_log /var/log/nginx/access.log vhost; access_log /var/log/nginx/access.log vhost;
return 503; return 503;
ssl_session_cache shared:SSL:50m;
ssl_session_tickets off; ssl_session_tickets off;
ssl_certificate /etc/nginx/certs/default.crt; ssl_certificate /etc/nginx/certs/default.crt;
ssl_certificate_key /etc/nginx/certs/default.key; ssl_certificate_key /etc/nginx/certs/default.key;
@ -163,8 +211,8 @@ upstream {{ $upstream_name }} {
{{/* Get the HTTPS_METHOD defined by containers w/ the same vhost, falling back to "redirect" */}} {{/* Get the HTTPS_METHOD defined by containers w/ the same vhost, falling back to "redirect" */}}
{{ $https_method := or (first (groupByKeys $containers "Env.HTTPS_METHOD")) "redirect" }} {{ $https_method := or (first (groupByKeys $containers "Env.HTTPS_METHOD")) "redirect" }}
{{/* Get the SSL_POLICY defined by containers w/ the same vhost, falling back to "Mozilla-Intermediate" */}} {{/* Get the SSL_POLICY defined by containers w/ the same vhost, falling back to empty string (use default) */}}
{{ $ssl_policy := or (first (groupByKeys $containers "Env.SSL_POLICY")) "Mozilla-Intermediate" }} {{ $ssl_policy := or (first (groupByKeys $containers "Env.SSL_POLICY")) "" }}
{{/* Get the HSTS defined by containers w/ the same vhost, falling back to "max-age=31536000" */}} {{/* Get the HSTS defined by containers w/ the same vhost, falling back to "max-age=31536000" */}}
{{ $hsts := or (first (groupByKeys $containers "Env.HSTS")) "max-age=31536000" }} {{ $hsts := or (first (groupByKeys $containers "Env.HSTS")) "max-age=31536000" }}
@ -215,36 +263,8 @@ server {
include /etc/nginx/network_internal.conf; include /etc/nginx/network_internal.conf;
{{ end }} {{ end }}
{{ if eq $ssl_policy "Mozilla-Modern" }} {{ template "ssl_policy" (dict "ssl_policy" $ssl_policy) }}
ssl_protocols TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256';
{{ else if eq $ssl_policy "Mozilla-Intermediate" }}
ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:!DSS';
{{ else if eq $ssl_policy "Mozilla-Old" }}
ssl_protocols SSLv3 TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:ECDHE-RSA-DES-CBC3-SHA:ECDHE-ECDSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:DES-CBC3-SHA:HIGH:SEED:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!RSAPSK:!aDH:!aECDH:!EDH-DSS-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA:!SRP';
{{ else if eq $ssl_policy "AWS-TLS-1-2-2017-01" }}
ssl_protocols TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:AES128-GCM-SHA256:AES128-SHA256:AES256-GCM-SHA384:AES256-SHA256';
{{ else if eq $ssl_policy "AWS-TLS-1-1-2017-01" }}
ssl_protocols TLSv1.1 TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:AES128-GCM-SHA256:AES128-SHA256:AES128-SHA:AES256-GCM-SHA384:AES256-SHA256:AES256-SHA';
{{ else if eq $ssl_policy "AWS-2016-08" }}
ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:AES128-GCM-SHA256:AES128-SHA256:AES128-SHA:AES256-GCM-SHA384:AES256-SHA256:AES256-SHA';
{{ else if eq $ssl_policy "AWS-2015-05" }}
ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:AES128-GCM-SHA256:AES128-SHA256:AES128-SHA:AES256-GCM-SHA384:AES256-SHA256:AES256-SHA:DES-CBC3-SHA';
{{ else if eq $ssl_policy "AWS-2015-03" }}
ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:AES128-GCM-SHA256:AES128-SHA256:AES128-SHA:AES256-GCM-SHA384:AES256-SHA256:AES256-SHA:DHE-DSS-AES128-SHA:DES-CBC3-SHA';
{{ else if eq $ssl_policy "AWS-2015-02" }}
ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:AES128-GCM-SHA256:AES128-SHA256:AES128-SHA:AES256-GCM-SHA384:AES256-SHA256:AES256-SHA:DHE-DSS-AES128-SHA';
{{ end }}
ssl_prefer_server_ciphers on;
ssl_session_timeout 5m; ssl_session_timeout 5m;
ssl_session_cache shared:SSL:50m; ssl_session_cache shared:SSL:50m;
ssl_session_tickets off; ssl_session_tickets off;