Merge branch 'master' into 'master'

Add support for AWS S3 Server-Side Encryption support

This adds support for AWS S3 SSE with S3 managed keys, this means the
data is encrypted at rest and the encryption is handled transparently to
the end user as well as in the AWS Console.

## Points to double check
I'm unsure on the best way to the handle the default. I've followed the `multipart_upload` de facto in the app. I'm happy to change this if required or if it will impact elsewhere e.g. omnibus packages

I also think I've managed to catch all of the documentation for this change as well.

### Why is this required
Many enterprises require good backup support but also for this to be encrypted. By default backups aren't encrypted, this allows at rest encryption to be supported in GitLab backups providing a layer of security should the physical media not be properly disposed of.

Relates to issue #2478.


See merge request !1280

2 files changed, 17 insertions, 14 deletions

diff --git a/config/gitlab.yml.example b/config/gitlab.yml.example
index 15930fc9079..c7174f86014 100644
--- a/config/gitlab.yml.example
+++ b/config/gitlab.yml.example
@@ -159,7 +159,7 @@ production: &base
         method: 'plain' # "tls" or "ssl" or "plain"
         bind_dn: '_the_full_dn_of_the_user_you_will_bind_with'
         password: '_the_password_of_the_bind_user'
-          
+
         # This setting specifies if LDAP server is Active Directory LDAP server.
         # For non AD servers it skips the AD specific queries.
         # If your LDAP server is not AD, set this to false.
@@ -204,13 +204,13 @@ production: &base
           # The username will be used in paths for the user's own projects
           # (like `gitlab.example.com/username/project`) and when mentioning
           # them in issues, merge request and comments (like `@username`).
-          # If the attribute specified for `username` contains an email address, 
+          # If the attribute specified for `username` contains an email address,
           # the GitLab username will be the part of the email address before the '@'.
           username: ['uid', 'userid', 'sAMAccountName']
           email:    ['mail', 'email', 'userPrincipalName']
 
           # If no full name could be found at the attribute specified for `name`,
-          # the full name is determined using the attributes specified for 
+          # the full name is determined using the attributes specified for
           # `first_name` and `last_name`.
           name:       'cn'
           first_name: 'givenName'
@@ -252,28 +252,28 @@ production: &base
     # arguments, followed by optional 'args' which can be either a hash or an array.
     # Documentation for this is available at http://doc.gitlab.com/ce/integration/omniauth.html
     providers:
-      # - { name: 'google_oauth2', 
+      # - { name: 'google_oauth2',
       #     label: 'Google',
-      #     app_id: 'YOUR_APP_ID', 
+      #     app_id: 'YOUR_APP_ID',
       #     app_secret: 'YOUR_APP_SECRET',
       #     args: { access_type: 'offline', approval_prompt: '' } }
-      # - { name: 'twitter', 
-      #     app_id: 'YOUR_APP_ID', 
+      # - { name: 'twitter',
+      #     app_id: 'YOUR_APP_ID',
       #     app_secret: 'YOUR_APP_SECRET' }
-      # - { name: 'github', 
+      # - { name: 'github',
       #     label: 'GitHub',
-      #     app_id: 'YOUR_APP_ID', 
+      #     app_id: 'YOUR_APP_ID',
       #     app_secret: 'YOUR_APP_SECRET',
       #     args: { scope: 'user:email' } }
-      # - { name: 'gitlab', 
+      # - { name: 'gitlab',
       #     label: 'GitLab.com',
-      #     app_id: 'YOUR_APP_ID', 
+      #     app_id: 'YOUR_APP_ID',
       #     app_secret: 'YOUR_APP_SECRET',
       #     args: { scope: 'api' } }
-      # - { name: 'bitbucket', 
-      #     app_id: 'YOUR_APP_ID', 
+      # - { name: 'bitbucket',
+      #     app_id: 'YOUR_APP_ID',
       #     app_secret: 'YOUR_APP_SECRET' }
-      # - { name: 'saml', 
+      # - { name: 'saml',
       #     label: 'Our SAML Provider',
       #     args: {
       #             assertion_consumer_service_url: 'https://gitlab.example.com/users/auth/saml/callback',
@@ -319,6 +319,8 @@ production: &base
     #   # Use multipart uploads when file size reaches 100MB, see
     #   #  http://docs.aws.amazon.com/AmazonS3/latest/dev/uploadobjusingmpu.html
     #   multipart_chunk_size: 104857600
+    #   # Turns on AWS Server-Side Encryption with Amazon S3-Managed Keys for backups, this is optional
+    #   # encryption: 'AES256'
 
   ## GitLab Shell settings
   gitlab_shell:
diff --git a/config/initializers/1_settings.rb b/config/initializers/1_settings.rb
index 48601b67335..4e4a8ecbdb3 100644
--- a/config/initializers/1_settings.rb
+++ b/config/initializers/1_settings.rb
@@ -229,6 +229,7 @@ if Settings.backup['upload']['connection']
   Settings.backup['upload']['connection'] = Hash[Settings.backup['upload']['connection'].map { |k, v| [k.to_sym, v] }]
 end
 Settings.backup['upload']['multipart_chunk_size'] ||= 104857600
+Settings.backup['upload']['encryption'] ||= nil
 
 #
 # Git