diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 62e3355ae62..43bf4289d09 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -79,7 +79,7 @@ class ApplicationController < ActionController::Base
   end
 
   def after_sign_out_path_for(_resource_or_scope)
-    if ENV['OMNIAUTH_ONLY'] == 'true' && ENV['OIDC_ENABLED'] == 'true'
+    if Rails.configuration.omniauth.only && Rails.configuration.omniauth.oidc_enabled
       '/auth/auth/openid_connect/logout'
     else
       new_user_session_path
diff --git a/app/controllers/concerns/web_app_controller_concern.rb b/app/controllers/concerns/web_app_controller_concern.rb
index b8c909877b6..fddb8f156be 100644
--- a/app/controllers/concerns/web_app_controller_concern.rb
+++ b/app/controllers/concerns/web_app_controller_concern.rb
@@ -11,7 +11,7 @@ module WebAppControllerConcern
   end
 
   def skip_csrf_meta_tags?
-    !(ENV['ONE_CLICK_SSO_LOGIN'] == 'true' && ENV['OMNIAUTH_ONLY'] == 'true' && Devise.omniauth_providers.length == 1) && current_user.nil?
+    !(ENV['ONE_CLICK_SSO_LOGIN'] == 'true' && Rails.configuration.omniauth.only && Devise.omniauth_providers.length == 1) && current_user.nil?
   end
 
   def set_app_body_class
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 7e9cfee3f68..6f85148b71a 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -49,7 +49,7 @@ module ApplicationHelper
   end
 
   def omniauth_only?
-    ENV['OMNIAUTH_ONLY'] == 'true'
+    Rails.configuration.omniauth.only
   end
 
   def link_to_login(name = nil, html_options = nil, &block)
diff --git a/app/helpers/registration_helper.rb b/app/helpers/registration_helper.rb
index ef5462ac887..596261de951 100644
--- a/app/helpers/registration_helper.rb
+++ b/app/helpers/registration_helper.rb
@@ -12,7 +12,7 @@ module RegistrationHelper
   end
 
   def omniauth_only?
-    ENV['OMNIAUTH_ONLY'] == 'true'
+    Rails.configuration.omniauth.only
   end
 
   def ip_blocked?(remote_ip)
diff --git a/app/serializers/initial_state_serializer.rb b/app/serializers/initial_state_serializer.rb
index 13f332c95c4..d8addbd1e02 100644
--- a/app/serializers/initial_state_serializer.rb
+++ b/app/serializers/initial_state_serializer.rb
@@ -125,6 +125,6 @@ class InitialStateSerializer < ActiveModel::Serializer
   end
 
   def sso_redirect
-    "/auth/auth/#{Devise.omniauth_providers[0]}" if ENV['ONE_CLICK_SSO_LOGIN'] == 'true' && ENV['OMNIAUTH_ONLY'] == 'true' && Devise.omniauth_providers.length == 1
+    "/auth/auth/#{Devise.omniauth_providers[0]}" if ENV['ONE_CLICK_SSO_LOGIN'] == 'true' && Rails.configuration.omniauth.only && Devise.omniauth_providers.length == 1
   end
 end
diff --git a/config/application.rb b/config/application.rb
index 5aca74fd1c6..6037ffdd7b9 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -112,6 +112,9 @@ module Mastodon
       end
     end
 
+    # Load config/omniauth.yml settings
+    config.omniauth = config_for(:omniauth)
+
     config.to_prepare do
       Doorkeeper::AuthorizationsController.layout 'modal'
       Doorkeeper::AuthorizedApplicationsController.layout 'admin'
diff --git a/config/initializers/3_omniauth.rb b/config/initializers/3_omniauth.rb
index aa8ba1a056e..d731c0fd5c4 100644
--- a/config/initializers/3_omniauth.rb
+++ b/config/initializers/3_omniauth.rb
@@ -10,98 +10,26 @@ end
 
 Devise.setup do |config|
   # CAS strategy
-  if ENV['CAS_ENABLED'] == 'true'
-    cas_options = {}
-    cas_options[:display_name] = ENV['CAS_DISPLAY_NAME']
-    cas_options[:url] = ENV['CAS_URL'] if ENV['CAS_URL']
-    cas_options[:host] = ENV['CAS_HOST'] if ENV['CAS_HOST']
-    cas_options[:port] = ENV['CAS_PORT'] if ENV['CAS_PORT']
-    cas_options[:ssl] = ENV['CAS_SSL'] == 'true' if ENV['CAS_SSL']
-    cas_options[:service_validate_url] = ENV['CAS_VALIDATE_URL'] if ENV['CAS_VALIDATE_URL']
-    cas_options[:callback_url] = ENV['CAS_CALLBACK_URL'] if ENV['CAS_CALLBACK_URL']
-    cas_options[:logout_url] = ENV['CAS_LOGOUT_URL'] if ENV['CAS_LOGOUT_URL']
-    cas_options[:login_url] = ENV['CAS_LOGIN_URL'] if ENV['CAS_LOGIN_URL']
-    cas_options[:uid_field] = ENV['CAS_UID_FIELD'] || 'user' if ENV['CAS_UID_FIELD']
-    cas_options[:ca_path] = ENV['CAS_CA_PATH'] if ENV['CAS_CA_PATH']
-    cas_options[:disable_ssl_verification] = ENV['CAS_DISABLE_SSL_VERIFICATION'] == 'true'
-    cas_options[:uid_key] = ENV['CAS_UID_KEY'] || 'user'
-    cas_options[:name_key] = ENV['CAS_NAME_KEY'] || 'name'
-    cas_options[:email_key] = ENV['CAS_EMAIL_KEY'] || 'email'
-    cas_options[:nickname_key] = ENV['CAS_NICKNAME_KEY'] || 'nickname'
-    cas_options[:first_name_key] = ENV['CAS_FIRST_NAME_KEY'] || 'firstname'
-    cas_options[:last_name_key] = ENV['CAS_LAST_NAME_KEY'] || 'lastname'
-    cas_options[:location_key] = ENV['CAS_LOCATION_KEY'] || 'location'
-    cas_options[:image_key] = ENV['CAS_IMAGE_KEY'] || 'image'
-    cas_options[:phone_key] = ENV['CAS_PHONE_KEY'] || 'phone'
-    cas_options[:security] = {}
-    cas_options[:security][:assume_email_is_verified] = ENV['CAS_SECURITY_ASSUME_EMAIL_IS_VERIFIED'] == 'true'
-    config.omniauth :cas, cas_options
+  if Rails.configuration.omniauth.cas_enabled
+    config.omniauth(
+      :cas,
+      Rails.configuration.omniauth.cas
+    )
   end
 
   # SAML strategy
-  if ENV['SAML_ENABLED'] == 'true'
-    saml_options = {}
-    saml_options[:display_name] = ENV['SAML_DISPLAY_NAME']
-    saml_options[:assertion_consumer_service_url] = ENV['SAML_ACS_URL'] if ENV['SAML_ACS_URL']
-    saml_options[:issuer] = ENV['SAML_ISSUER'] if ENV['SAML_ISSUER']
-    saml_options[:idp_sso_target_url] = ENV['SAML_IDP_SSO_TARGET_URL'] if ENV['SAML_IDP_SSO_TARGET_URL']
-    saml_options[:idp_sso_target_url_runtime_params] = ENV['SAML_IDP_SSO_TARGET_PARAMS'] if ENV['SAML_IDP_SSO_TARGET_PARAMS'] # FIXME: Should be parsable Hash
-    saml_options[:idp_cert] = ENV['SAML_IDP_CERT'] if ENV['SAML_IDP_CERT']
-    saml_options[:idp_cert_fingerprint] = ENV['SAML_IDP_CERT_FINGERPRINT'] if ENV['SAML_IDP_CERT_FINGERPRINT']
-    saml_options[:idp_cert_fingerprint_validator] = ENV['SAML_IDP_CERT_FINGERPRINT_VALIDATOR'] if ENV['SAML_IDP_CERT_FINGERPRINT_VALIDATOR'] # FIXME: Should be Lambda { |fingerprint| }
-    saml_options[:name_identifier_format] = ENV['SAML_NAME_IDENTIFIER_FORMAT'] if ENV['SAML_NAME_IDENTIFIER_FORMAT']
-    saml_options[:request_attributes] = {}
-    saml_options[:certificate] = ENV['SAML_CERT'] if ENV['SAML_CERT']
-    saml_options[:private_key] = ENV['SAML_PRIVATE_KEY'] if ENV['SAML_PRIVATE_KEY']
-    saml_options[:security] = {}
-    saml_options[:security][:want_assertions_signed] = ENV['SAML_SECURITY_WANT_ASSERTION_SIGNED'] == 'true'
-    saml_options[:security][:want_assertions_encrypted] = ENV['SAML_SECURITY_WANT_ASSERTION_ENCRYPTED'] == 'true'
-    saml_options[:security][:assume_email_is_verified] = ENV['SAML_SECURITY_ASSUME_EMAIL_IS_VERIFIED'] == 'true'
-    saml_options[:attribute_statements] = {}
-    saml_options[:attribute_statements][:uid] = [ENV['SAML_ATTRIBUTES_STATEMENTS_UID']] if ENV['SAML_ATTRIBUTES_STATEMENTS_UID']
-    saml_options[:attribute_statements][:email] = [ENV['SAML_ATTRIBUTES_STATEMENTS_EMAIL']] if ENV['SAML_ATTRIBUTES_STATEMENTS_EMAIL']
-    saml_options[:attribute_statements][:full_name] = [ENV['SAML_ATTRIBUTES_STATEMENTS_FULL_NAME']] if ENV['SAML_ATTRIBUTES_STATEMENTS_FULL_NAME']
-    saml_options[:attribute_statements][:first_name] = [ENV['SAML_ATTRIBUTES_STATEMENTS_FIRST_NAME']] if ENV['SAML_ATTRIBUTES_STATEMENTS_FIRST_NAME']
-    saml_options[:attribute_statements][:last_name] = [ENV['SAML_ATTRIBUTES_STATEMENTS_LAST_NAME']] if ENV['SAML_ATTRIBUTES_STATEMENTS_LAST_NAME']
-    saml_options[:attribute_statements][:verified] = [ENV['SAML_ATTRIBUTES_STATEMENTS_VERIFIED']] if ENV['SAML_ATTRIBUTES_STATEMENTS_VERIFIED']
-    saml_options[:attribute_statements][:verified_email] = [ENV['SAML_ATTRIBUTES_STATEMENTS_VERIFIED_EMAIL']] if ENV['SAML_ATTRIBUTES_STATEMENTS_VERIFIED_EMAIL']
-    saml_options[:uid_attribute] = ENV['SAML_UID_ATTRIBUTE'] if ENV['SAML_UID_ATTRIBUTE']
-    saml_options[:allowed_clock_drift] = ENV['SAML_ALLOWED_CLOCK_DRIFT'] if ENV['SAML_ALLOWED_CLOCK_DRIFT']
-    config.omniauth :saml, saml_options
+  if Rails.configuration.omniauth.saml_enabled
+    config.omniauth(
+      :saml,
+      Rails.configuration.omniauth.saml
+    )
   end
 
   # OpenID Connect Strategy
-  if ENV['OIDC_ENABLED'] == 'true'
-    oidc_options = {}
-    oidc_options[:display_name] = ENV['OIDC_DISPLAY_NAME'] # OPTIONAL
-    oidc_options[:issuer] = ENV['OIDC_ISSUER'] if ENV['OIDC_ISSUER'] # NEED
-    oidc_options[:discovery] = ENV['OIDC_DISCOVERY'] == 'true' if ENV['OIDC_DISCOVERY'] # OPTIONAL (default: false)
-    oidc_options[:client_auth_method] = ENV['OIDC_CLIENT_AUTH_METHOD'] if ENV['OIDC_CLIENT_AUTH_METHOD'] # OPTIONAL (default: basic)
-    scope_string = ENV['OIDC_SCOPE'] if ENV['OIDC_SCOPE'] # NEED
-    scopes = scope_string.split(',')
-    oidc_options[:scope] = scopes.map(&:to_sym)
-    oidc_options[:response_type] = ENV['OIDC_RESPONSE_TYPE'] if ENV['OIDC_RESPONSE_TYPE'] # OPTIONAL (default: code)
-    oidc_options[:response_mode] = ENV['OIDC_RESPONSE_MODE'] if ENV['OIDC_RESPONSE_MODE'] # OPTIONAL (default: query)
-    oidc_options[:display] = ENV['OIDC_DISPLAY'] if ENV['OIDC_DISPLAY'] # OPTIONAL (default: page)
-    oidc_options[:prompt] = ENV['OIDC_PROMPT'] if ENV['OIDC_PROMPT'] # OPTIONAL
-    oidc_options[:send_nonce] = ENV['OIDC_SEND_NONCE'] == 'true' if ENV['OIDC_SEND_NONCE'] # OPTIONAL (default: true)
-    oidc_options[:send_scope_to_token_endpoint] = ENV['OIDC_SEND_SCOPE_TO_TOKEN_ENDPOINT'] == 'true' if ENV['OIDC_SEND_SCOPE_TO_TOKEN_ENDPOINT'] # OPTIONAL (default: true)
-    oidc_options[:post_logout_redirect_uri] = ENV['OIDC_IDP_LOGOUT_REDIRECT_URI'] if ENV['OIDC_IDP_LOGOUT_REDIRECT_URI'] # OPTIONAL
-    oidc_options[:uid_field] = ENV['OIDC_UID_FIELD'] if ENV['OIDC_UID_FIELD'] # NEED
-    oidc_options[:client_options] = {}
-    oidc_options[:client_options][:identifier] = ENV['OIDC_CLIENT_ID'] if ENV['OIDC_CLIENT_ID'] # NEED
-    oidc_options[:client_options][:secret] = ENV['OIDC_CLIENT_SECRET'] if ENV['OIDC_CLIENT_SECRET'] # NEED
-    oidc_options[:client_options][:redirect_uri] = ENV['OIDC_REDIRECT_URI'] if ENV['OIDC_REDIRECT_URI'] # NEED
-    oidc_options[:client_options][:scheme] = ENV['OIDC_HTTP_SCHEME'] if ENV['OIDC_HTTP_SCHEME'] # OPTIONAL (default: https)
-    oidc_options[:client_options][:host] = ENV['OIDC_HOST'] if ENV['OIDC_HOST'] # OPTIONAL
-    oidc_options[:client_options][:port] = ENV['OIDC_PORT'] if ENV['OIDC_PORT'] # OPTIONAL
-    oidc_options[:client_options][:authorization_endpoint] = ENV['OIDC_AUTH_ENDPOINT'] if ENV['OIDC_AUTH_ENDPOINT'] # NEED when discovery != true
-    oidc_options[:client_options][:token_endpoint] = ENV['OIDC_TOKEN_ENDPOINT'] if ENV['OIDC_TOKEN_ENDPOINT'] # NEED when discovery != true
-    oidc_options[:client_options][:userinfo_endpoint] = ENV['OIDC_USER_INFO_ENDPOINT'] if ENV['OIDC_USER_INFO_ENDPOINT'] # NEED when discovery != true
-    oidc_options[:client_options][:jwks_uri] = ENV['OIDC_JWKS_URI'] if ENV['OIDC_JWKS_URI'] # NEED when discovery != true
-    oidc_options[:client_options][:end_session_endpoint] = ENV['OIDC_END_SESSION_ENDPOINT'] if ENV['OIDC_END_SESSION_ENDPOINT'] # OPTIONAL
-    oidc_options[:security] = {}
-    oidc_options[:security][:assume_email_is_verified] = ENV['OIDC_SECURITY_ASSUME_EMAIL_IS_VERIFIED'] == 'true' # OPTIONAL
-    config.omniauth :openid_connect, oidc_options
+  if Rails.configuration.omniauth.oidc_enabled
+    config.omniauth(
+      :openid_connect,
+      Rails.configuration.omniauth.oidc
+    )
   end
 end
diff --git a/config/initializers/content_security_policy.rb b/config/initializers/content_security_policy.rb
index e43e38786c4..b225694c68e 100644
--- a/config/initializers/content_security_policy.rb
+++ b/config/initializers/content_security_policy.rb
@@ -14,7 +14,7 @@ media_hosts = policy.media_hosts
 
 def sso_host
   return unless ENV['ONE_CLICK_SSO_LOGIN'] == 'true'
-  return unless ENV['OMNIAUTH_ONLY'] == 'true'
+  return unless Rails.configuration.omniauth.only
   return unless Devise.omniauth_providers.length == 1
 
   provider = Devise.omniauth_configs[Devise.omniauth_providers[0]]
diff --git a/config/omniauth.yml b/config/omniauth.yml
new file mode 100644
index 00000000000..d2da207d28a
--- /dev/null
+++ b/config/omniauth.yml
@@ -0,0 +1,85 @@
+---
+shared:
+  only: <%= ENV.fetch('OMNIAUTH_ONLY', 'false') == 'true' %>
+  cas_enabled: <%= ENV.fetch('CAS_ENABLED', 'false') == 'true' %>
+  oidc_enabled: <%= ENV.fetch('OIDC_ENABLED', 'false') == 'true' %>
+  saml_enabled: <%= ENV.fetch('SAML_ENABLED', 'false') == 'true' %>
+  cas:
+    display_name: <%= ENV.fetch('CAS_DISPLAY_NAME', nil) %>
+    url: <%= ENV.fetch('CAS_URL', nil) %>
+    host: <%= ENV.fetch('CAS_HOST', nil) %>
+    port: <%= ENV.fetch('CAS_PORT', nil) %>
+    ssl: <%= ENV.fetch('SAS_SSL', 'false') == 'true' %>
+    service_validate_url: <%= ENV.fetch('CAS_VALIDATE_URL', nil) %>
+    callback_url: <%= ENV.fetch('CAS_CALLBACK_URL', nil) %>
+    logout_url: <%= ENV.fetch('CAS_LOGOUT_URL', nil) %>
+    login_url: <%= ENV.fetch('CAS_LOGIN_URL', nil) %>
+    uid_field: <%= ENV.fetch('CAS_UID_FIELD', 'user') %>
+    ca_path: <%= ENV.fetch('CAS_CA_PATH', nil) %>
+    disable_ssl_verification: <%= ENV.fetch('CAS_DISABLE_SSL_VERIFICATION', 'false') == 'true' %>
+    uid_key: <%= ENV.fetch('CAS_UID_KEY', 'user') %>
+    name_key: <%= ENV.fetch('CAS_NAME_KEY', 'name') %>
+    email_key: <%= ENV.fetch('CAS_EMAIL_KEY', 'email') %>
+    nickname_key: <%= ENV.fetch('CAS_NICKNAME_KEY', 'nickname') %>
+    first_name_key: <%= ENV.fetch('CAS_FIRST_NAME_KEY', 'firstname') %>
+    last_name_key: <%= ENV.fetch('CAS_LAST_NAME_KEY', 'lastname') %>
+    location_key: <%= ENV.fetch('CAS_LOCATION_KEY', 'location') %>
+    image_key: <%= ENV.fetch('CAS_IMAGE_KEY', 'image') %>
+    phone_key: <%= ENV.fetch('CAS_PHONE_KEY', 'phone') %>
+    security:
+      assume_email_is_verified: <%= ENV.fetch('CAS_SECURITY_ASSUME_EMAIL_IS_VERIFIED', 'false') == 'true' %>
+  saml:
+    display_name: <%= ENV.fetch('SAML_DISPLAY_NAME', nil) %>
+    assertion_consumer_service_url: <%= ENV.fetch('SAML_ACS_URL', nil) %>
+    issuer: <%= ENV.fetch('SAML_ISSUER', nil) %>
+    idp_sso_target_url: <%= ENV.fetch('SAML_IDP_SSO_TARGET_URL', nil) %>
+    idp_sso_target_url_runtime_params: <%= ENV.fetch('SAML_IDP_SSO_TARGET_PARAMS', nil) %> # FIXME: Should be parsable Hash
+    idp_cert: <%= ENV.fetch('SAML_IDP_CERT', nil) %>
+    idp_cert_fingerprint: <%= ENV.fetch('SAML_IDP_CERT_FINGERPRINT', nil) %>
+    idp_cert_fingerprint_validator: <%= ENV.fetch('SAML_IDP_CERT_FINGERPRINT_VALIDATOR', nil) %> # FIXME: Should be Lambda { |fingerprint| }
+    name_identifier_format: <%= ENV.fetch('SAML_NAME_IDENTIFIER_FORMAT', nil) %>
+    request_attributes: {}
+    certificate: <%= ENV.fetch('SAML_CERT', nil) %>
+    private_key: <%= ENV.fetch('SAML_PRIVATE_KEY', nil) %>
+    security:
+      want_assertions_signed: <%= ENV.fetch('SAML_SECURITY_WANT_ASSERTION_SIGNED', 'false') == 'true' %>
+      want_assertions_encrypted: <%= ENV.fetch('SAML_SECURITY_WANT_ASSERTION_ENCRYPTED', 'false') == 'true' %>
+      assume_email_is_verified: <%= ENV.fetch('SAML_SECURITY_ASSUME_EMAIL_IS_VERIFIED', 'false') == 'true' %>
+    attribute_statements:
+      uid: <%= [ENV.fetch('SAML_ATTRIBUTES_STATEMENTS_UID', nil)] %>
+      email: <%= [ENV.fetch('SAML_ATTRIBUTES_STATEMENTS_EMAIL', nil)] %>
+      full_name: <%= [ENV.fetch('SAML_ATTRIBUTES_STATEMENTS_FULL_NAME', nil)] %>
+      first_name: <%= [ENV.fetch('SAML_ATTRIBUTES_STATEMENTS_FIRST_NAME', nil)] %>
+      last_name: <%= [ENV.fetch('SAML_ATTRIBUTES_STATEMENTS_LAST_NAME', nil)] %>
+      verified: <%= [ENV.fetch('SAML_ATTRIBUTES_STATEMENTS_VERIFIED', nil)] %>
+      verified_email: <%= [ENV.fetch('SAML_ATTRIBUTES_STATEMENTS_VERIFIED_EMAIL', nil)] %>
+    uid_attribute: <%= ENV.fetch('SAML_UID_ATTRIBUTE', nil) %>
+    allowed_clock_drift: <%= ENV.fetch('SAML_ALLOWED_CLOCK_DRIFT', nil) %>
+  oidc:
+    display_name: <%= ENV.fetch('OIDC_DISPLAY_NAME', nil) %> # OPTIONAL
+    issuer: <%= ENV.fetch('OIDC_ISSUER', nil) %> # NEED
+    discovery: <%= ENV.fetch('OIDC_DISCOVERY', 'false') == 'true' %> # OPTIONAL (default: false)
+    client_auth_method: <%= ENV.fetch('OIDC_CLIENT_AUTH_METHOD', nil) %> # OPTIONAL (default: basic)
+    scope: <%= ENV.fetch('OIDC_SCOPE', '').split(',').map(&:to_sym) %>
+    response_type: <%= ENV.fetch('OIDC_RESPONSE_TYPE', nil) %> # OPTIONAL (default: code)
+    response_mode: <%= ENV.fetch('OIDC_RESPONSE_MODE', nil) %> # OPTIONAL (default: query)
+    display: <%= ENV.fetch('OIDC_DISPLAY', nil) %> # OPTIONAL (default: page)
+    prompt: <%= ENV.fetch('OIDC_PROMPT', nil) %> # OPTIONAL
+    send_nonce: <%= ENV.fetch('OIDC_SEND_NONCE', 'true') == 'true' %> # OPTIONAL (default: true)
+    send_scope_to_token_endpoint: <%= ENV.fetch('OIDC_SEND_SCOPE_TO_TOKEN_ENDPOINT', 'true') == 'true' %> # OPTIONAL (default: true)
+    post_logout_redirect_uri: <%= ENV.fetch('OIDC_IDP_LOGOUT_REDIRECT_URI', nil) %> # OPTIONAL
+    uid_field: <%= ENV.fetch('OIDC_UID_FIELD', nil) %> # NEED
+    client_options:
+      identifier: <%= ENV.fetch('OIDC_CLIENT_ID', nil) %> # NEED
+      secret: <%= ENV.fetch('OIDC_CLIENT_SECRET', nil) %> # NEED
+      redirect_uri: <%= ENV.fetch('OIDC_REDIRECT_URI', nil) %> # NEED
+      scheme: <%= ENV.fetch('OIDC_HTTP_SCHEME', nil) %> # OPTIONAL (default: https)
+      host: <%= ENV.fetch('OIDC_HOST', nil) %> # OPTIONAL
+      port: <%= ENV.fetch('OIDC_PORT', nil) %> # OPTIONAL
+      authorization_endpoint: <%= ENV.fetch('OIDC_AUTH_ENDPOINT', nil) %> # NEED when discovery != true
+      token_endpoint: <%= ENV.fetch('OIDC_TOKEN_ENDPOINT', nil) %> # NEED when discovery != true
+      userinfo_endpoint: <%= ENV.fetch('OIDC_USER_INFO_ENDPOINT', nil) %> # NEED when discovery != true
+      jwks_uri: <%= ENV.fetch('OIDC_JWKS_URI', nil) %> # NEED when discovery != true
+      end_session_endpoint: <%= ENV.fetch('OIDC_END_SESSION_ENDPOINT', nil) %> # OPTIONAL
+    security:
+      assume_email_is_verified: <%= ENV.fetch('OIDC_SECURITY_ASSUME_EMAIL_IS_VERIFIED', 'false') == 'true' %> # OPTIONAL
diff --git a/spec/helpers/application_helper_spec.rb b/spec/helpers/application_helper_spec.rb
index 56974513bef..4859816d09c 100644
--- a/spec/helpers/application_helper_spec.rb
+++ b/spec/helpers/application_helper_spec.rb
@@ -88,9 +88,10 @@ describe ApplicationHelper do
 
     context 'when in omniauth only mode' do
       around do |example|
-        ClimateControl.modify OMNIAUTH_ONLY: 'true' do
-          example.run
-        end
+        original = Rails.configuration.omniauth.only
+        Rails.configuration.omniauth.only = true
+        example.run
+        Rails.configuration.omniauth.only = original
       end
 
       it 'redirects to joinmastodon site' do
@@ -106,11 +107,12 @@ describe ApplicationHelper do
   end
 
   describe 'omniauth_only?' do
-    context 'when env var is set to true' do
+    context 'when configuration is set to true' do
       around do |example|
-        ClimateControl.modify OMNIAUTH_ONLY: 'true' do
-          example.run
-        end
+        original = Rails.configuration.omniauth.only
+        Rails.configuration.omniauth.only = true
+        example.run
+        Rails.configuration.omniauth.only = original
       end
 
       it 'returns true' do
@@ -118,11 +120,12 @@ describe ApplicationHelper do
       end
     end
 
-    context 'when env var is not set' do
+    context 'when configuration is false' do
       around do |example|
-        ClimateControl.modify OMNIAUTH_ONLY: nil do
-          example.run
-        end
+        original = Rails.configuration.omniauth.only
+        Rails.configuration.omniauth.only = false
+        example.run
+        Rails.configuration.omniauth.only = original
       end
 
       it 'returns false' do
diff --git a/spec/requests/omniauth_callbacks_spec.rb b/spec/requests/omniauth_callbacks_spec.rb
index 095535e4859..403dda4640d 100644
--- a/spec/requests/omniauth_callbacks_spec.rb
+++ b/spec/requests/omniauth_callbacks_spec.rb
@@ -129,15 +129,15 @@ describe 'OmniAuth callbacks' do
     end
   end
 
-  describe '#openid_connect', if: ENV['OIDC_ENABLED'] == 'true' && ENV['OIDC_SCOPE'].present? do
+  describe '#openid_connect', if: Rails.configuration.omniauth.oidc_enabled && Rails.configuration.omniauth.oidc[:scope].present? do
     include_examples 'omniauth provider callbacks', :openid_connect
   end
 
-  describe '#cas', if: ENV['CAS_ENABLED'] == 'true' do
+  describe '#cas', if: Rails.configuration.omniauth.cas_enabled do
     include_examples 'omniauth provider callbacks', :cas
   end
 
-  describe '#saml', if: ENV['SAML_ENABLED'] == 'true' do
+  describe '#saml', if: Rails.configuration.omniauth.saml_enabled do
     include_examples 'omniauth provider callbacks', :saml
   end
 end