Remove deprecated SSL settings and simplify SSL configuration (#213)

* Mark deprecated SSL settings as obsolete

This commit updates SSL settings to be marked as obsolete:
- Replace `ssl` with `ssl_enabled`
- Replace `ca_file` with `ssl_certificate_authorities`
- Replace `ssl_certificate_verification` with `ssl_verification_mode`

`setup_ssl_params!` has been updated to only handle SSL inference
when not explicitly configured.

* Fix accidental removal of changelog entry

During a rebase the latest 4 series entry was deleted. This restores it.

Author: donoghuc

CHANGELOG.md

@@ -1,3 +1,11 @@
+## 5.0.0
+  - SSL settings that were marked deprecated in version `4.17.0` are now marked obsolete, and will prevent the plugin from starting.
+  - These settings are:
+    - `ssl`, which should bre replaced by `ssl_enabled`
+    - `ca_file`, which should bre replaced by `ssl_certificate_authorities`
+    - `ssl_certificate_verification`, which should bre replaced by `ssl_verification_mode`
+    - [#213](https://github.com/logstash-plugins/logstash-input-elasticsearch/pull/213)
+
 ## 4.20.5
   - Add `x-elastic-product-origin` header to Elasticsearch requests [#211](https://github.com/logstash-plugins/logstash-input-elasticsearch/pull/211)
 

docs/index.asciidoc

@@ -96,7 +96,13 @@ TIP: Set the `target` option to avoid potential schema conflicts.
 [id="plugins-{type}s-{plugin}-options"]
 ==== Elasticsearch Input configuration options
 
-This plugin supports the following configuration options plus the <<plugins-{type}s-{plugin}-common-options>> and the <<plugins-{type}s-{plugin}-deprecated-options>> described later.
+This plugin supports these configuration options plus the <<plugins-{type}s-{plugin}-common-options>> described later.
+
+NOTE: As of version `5.0.0` of this plugin, a number of previously deprecated settings related to SSL have been removed.
+Please check out <<plugins-{type}s-{plugin}-obsolete-options>> for details.
+
+NOTE: As of version `5.0.0` of this plugin, a number of previously deprecated settings related to SSL have been removed.
+Please check out <<plugins-{type}s-{plugin}-obsolete-options>> for details.
 
 [cols="<,<,<",options="header",]
 |=======================================================================
@@ -478,6 +484,8 @@ Enable SSL/TLS secured communication to Elasticsearch cluster.
 Leaving this unspecified will use whatever scheme is specified in the URLs listed in <<plugins-{type}s-{plugin}-hosts>> or extracted from the <<plugins-{type}s-{plugin}-cloud_id>>.
 If no explicit protocol is specified plain HTTP will be used.
 
+When not explicitly set, SSL will be automatically enabled if any of the specified hosts use HTTPS.
+
 [id="plugins-{type}s-{plugin}-ssl_key"]
 ===== `ssl_key`
   * Value type is <<path,path>>
@@ -608,56 +616,21 @@ option when authenticating to the Elasticsearch server. If set to an
 empty string authentication will be disabled.
 
 
-[id="plugins-{type}s-{plugin}-deprecated-options"]
-==== Elasticsearch Input deprecated configuration options
+[id="plugins-{type}s-{plugin}-obsolete-options"]
+==== Elasticsearch Input Obsolete Configuration Options
 
-This plugin supports the following deprecated configurations.
+WARNING: As of version `5.0.0` of this plugin, some configuration options have been replaced.
+The plugin will fail to start if it contains any of these obsolete options. 
 
-WARNING: Deprecated options are subject to removal in future releases.
 
-[cols="<,<,<",options="header",]
+[cols="<,<",options="header",]
 |=======================================================================
-|Setting|Input type|Replaced by
-| <<plugins-{type}s-{plugin}-ca_file>> |a valid filesystem path|<<plugins-{type}s-{plugin}-ssl_certificate_authorities>>
-| <<plugins-{type}s-{plugin}-ssl>> |<<boolean,boolean>>|<<plugins-{type}s-{plugin}-ssl_enabled>>
-| <<plugins-{type}s-{plugin}-ssl_certificate_verification>> |<<boolean,boolean>>|<<plugins-{type}s-{plugin}-ssl_verification_mode>>
+|Setting|Replaced by
+| ca_file | <<plugins-{type}s-{plugin}-ssl_certificate_authorities>>
+| ssl | <<plugins-{type}s-{plugin}-ssl_enabled>>
+| ssl_certificate_verification | <<plugins-{type}s-{plugin}-ssl_verification_mode>>
 |=======================================================================
 
-[id="plugins-{type}s-{plugin}-ca_file"]
-===== `ca_file`
-deprecated[4.17.0, Replaced by <<plugins-{type}s-{plugin}-ssl_certificate_authorities>>]
-
-* Value type is <<path,path>>
-* There is no default value for this setting.
-
-SSL Certificate Authority file in PEM encoded format, must also include any chain certificates as necessary.
-
-[id="plugins-{type}s-{plugin}-ssl"]
-===== `ssl`
-deprecated[4.17.0, Replaced by <<plugins-{type}s-{plugin}-ssl_enabled>>]
-
-* Value type is <<boolean,boolean>>
-* Default value is `false`
-
-If enabled, SSL will be used when communicating with the Elasticsearch
-server (i.e. HTTPS will be used instead of plain HTTP).
-
-
-[id="plugins-{type}s-{plugin}-ssl_certificate_verification"]
-===== `ssl_certificate_verification`
-deprecated[4.17.0, Replaced by <<plugins-{type}s-{plugin}-ssl_verification_mode>>]
-
-* Value type is <<boolean,boolean>>
-* Default value is `true`
-
-Option to validate the server's certificate. Disabling this severely compromises security.
-When certificate validation is disabled, this plugin implicitly trusts the machine
-resolved at the given address without validating its proof-of-identity.
-In this scenario, the plugin can transmit credentials to or process data from an untrustworthy
-man-in-the-middle or other compromised infrastructure.
-More information on the importance of certificate verification:
-**https://www.cs.utexas.edu/~shmat/shmat_ccs12.pdf**.
-
 [id="plugins-{type}s-{plugin}-common-options"]
 include::{include_path}/{type}.asciidoc[]
 

lib/logstash/inputs/elasticsearch.rb

@@ -198,23 +198,12 @@ class LogStash::Inputs::Elasticsearch < LogStash::Inputs::Base
   # Set the address of a forward HTTP proxy.
   config :proxy, :validate => :uri_or_empty
 
-  # SSL
-  config :ssl, :validate => :boolean, :default => false, :deprecated => "Set 'ssl_enabled' instead."
-
-  # SSL Certificate Authority file in PEM encoded format, must also include any chain certificates as necessary
-  config :ca_file, :validate => :path, :deprecated => "Set 'ssl_certificate_authorities' instead."
-
   # OpenSSL-style X.509 certificate certificate to authenticate the client
   config :ssl_certificate, :validate => :path
 
   # SSL Certificate Authority files in PEM encoded format, must also include any chain certificates as necessary
   config :ssl_certificate_authorities, :validate => :path, :list => true
 
-  # Option to validate the server's certificate. Disabling this severely compromises security.
-  # For more information on the importance of certificate verification please read
-  # https://www.cs.utexas.edu/~shmat/shmat_ccs12.pdf
-  config :ssl_certificate_verification, :validate => :boolean, :default => true, :deprecated => "Set 'ssl_verification_mode' instead."
-
   # The list of cipher suites to use, listed by priorities.
   # Supported cipher suites vary depending on which version of Java is used.
   config :ssl_cipher_suites, :validate => :string, :list => true
@@ -242,7 +231,6 @@ class LogStash::Inputs::Elasticsearch < LogStash::Inputs::Base
   config :ssl_truststore_password, :validate => :password
 
   # The JKS truststore to validate the server's certificate.
-  # Use either `:ssl_truststore_path` or `:ssl_certificate_authorities`
   config :ssl_truststore_path, :validate => :path
 
   # The format of the truststore file. It must be either jks or pkcs12
@@ -264,6 +252,11 @@ class LogStash::Inputs::Elasticsearch < LogStash::Inputs::Base
   # If set, the _source of each hit will be added nested under the target instead of at the top-level
   config :target, :validate => :field_reference
 
+  # Obsolete Settings
+  config :ssl, :obsolete => "Set 'ssl_enabled' instead."
+  config :ca_file, :obsolete => "Set 'ssl_certificate_authorities' instead."
+  config :ssl_certificate_verification, :obsolete => "Set 'ssl_verification_mode' instead."
+
   # config :ca_trusted_fingerprint, :validate => :sha_256_hex
   include LogStash::PluginMixins::CATrustedFingerprintSupport
 
@@ -408,8 +401,6 @@ def setup_client_ssl
     ssl_options[:ssl] = true if @ssl_enabled
 
     unless @ssl_enabled
-      # Keep it backward compatible with the deprecated `ssl` option
-      ssl_options[:trust_strategy] = trust_strategy_for_ca_trusted_fingerprint if original_params.include?('ssl')
       return ssl_options
     end
 
@@ -473,38 +464,11 @@ def setup_client_ssl
   end
 
   def setup_ssl_params!
-    @ssl_enabled = normalize_config(:ssl_enabled) do |normalize|
-      normalize.with_deprecated_alias(:ssl)
-    end
-
-    # Infer the value if neither the deprecate `ssl` and `ssl_enabled` were set
-    infer_ssl_enabled_from_hosts
-
-    @ssl_certificate_authorities = normalize_config(:ssl_certificate_authorities) do |normalize|
-      normalize.with_deprecated_mapping(:ca_file) do |ca_file|
-        [ca_file]
-      end
+    # Only infer ssl_enabled if it wasn't explicitly set
+    unless original_params.include?('ssl_enabled')
+      @ssl_enabled = effectively_ssl?
+      params['ssl_enabled'] = @ssl_enabled
     end
-
-    @ssl_verification_mode = normalize_config(:ssl_verification_mode) do |normalize|
-      normalize.with_deprecated_mapping(:ssl_certificate_verification) do |ssl_certificate_verification|
-        if ssl_certificate_verification == true
-          "full"
-        else
-          "none"
-        end
-      end
-    end
-
-    params['ssl_enabled'] = @ssl_enabled
-    params['ssl_certificate_authorities'] = @ssl_certificate_authorities unless @ssl_certificate_authorities.nil?
-    params['ssl_verification_mode'] = @ssl_verification_mode unless @ssl_verification_mode.nil?
-  end
-
-  def infer_ssl_enabled_from_hosts
-    return if original_params.include?('ssl') || original_params.include?('ssl_enabled')
-
-    @ssl_enabled = params['ssl_enabled'] = effectively_ssl?
   end
 
   def setup_hosts

logstash-input-elasticsearch.gemspec

@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
 
   s.name            = 'logstash-input-elasticsearch'
-  s.version         = '4.20.5'
+  s.version         = '5.0.0'
   s.licenses        = ['Apache License (2.0)']
   s.summary         = "Reads query results from an Elasticsearch cluster"
   s.description     = "This gem is a Logstash plugin required to be installed on top of the Logstash core pipeline using $LS_HOME/bin/logstash-plugin install gemname. This gem is not a stand-alone program"

spec/inputs/elasticsearch_spec.rb

@@ -58,6 +58,19 @@
       end
     end
 
+    describe 'handling obsolete settings' do
+      [{:name => 'ssl', :replacement => 'ssl_enabled', :sample_value => true},
+       {:name => 'ca_file', :replacement => 'ssl_certificate_authorities', :sample_value => 'spec/fixtures/test_certs/ca.crt'},
+       {:name => 'ssl_certificate_verification', :replacement => 'ssl_verification_mode', :sample_value => false }].each do | obsolete_setting|
+        context "with obsolete #{obsolete_setting[:name]}" do
+          let (:config) { {obsolete_setting[:name] => obsolete_setting[:sample_value]} }
+          it "should raise a config error with the appropriate message" do
+            expect { plugin.register }.to raise_error LogStash::ConfigurationError, /The setting `#{obsolete_setting[:name]}` in plugin `elasticsearch` is obsolete and is no longer available. Set '#{obsolete_setting[:replacement]}' instead/i
+          end
+        end
+      end
+    end
+
     context "against not authentic Elasticsearch" do
       before(:each) do
          Elasticsearch::Client.send(:define_method, :ping) { raise Elasticsearch::UnsupportedProductError.new("Fake error") } # define error ping method