Add an opt-in OS credential store for gem and bundler credentials

Manifest.txt

@@ -395,6 +395,10 @@ lib/rubygems/core_ext/kernel_gem.rb
 lib/rubygems/core_ext/kernel_require.rb
 lib/rubygems/core_ext/kernel_warn.rb
 lib/rubygems/core_ext/tcpsocket_init.rb
+lib/rubygems/credential_store.rb
+lib/rubygems/credential_store/native/linux.rb
+lib/rubygems/credential_store/native/macos.rb
+lib/rubygems/credential_store/native/windows.rb
 lib/rubygems/defaults.rb
 lib/rubygems/dependency.rb
 lib/rubygems/dependency_installer.rb

lib/bundler/man/bundle-config.1

@@ -101,6 +101,8 @@ The CLI flag and this setting apply uniformly to every source, including ones de
 .IP
 Cooldown filtering depends on the gem server providing a per\-version \fBcreated_at\fR timestamp in the v2 compact\-index format\. Versions without that metadata \- older gem servers, historical entries that predate the v2 cutover on \fBrubygems\.org\fR, or private registries that still emit the v1 format \- are treated as outside the cooldown window and remain resolvable\. If you rely on cooldown for supply\-chain protection, confirm that the gem server emits \fBcreated_at\fR in its \fB/info/<gem>\fR responses\.
 .IP "\(bu" 4
+\fBcredential_store\fR (\fBBUNDLE_CREDENTIAL_STORE\fR): Experimental: store and read host credentials (the values otherwise set via \fBbundle config set <host> <user:pass>\fR) in a credential store instead of the plain text config file\. Set it to \fBtrue\fR to use the operating system's native store (macOS Keychain, Linux Secret Service, Windows Credential Manager) when one is available on this platform, or to the name of a backend provided by a third\-party gem, such as \fB1password\fR\. Falls back to the config file when the store is unavailable or fails, warning that the credential was written in plain text\. Defaults to false\. Credentials already written to the config file are not migrated automatically; re\-run \fBbundle config set <host> <user:pass>\fR with the setting enabled to move each one into the store\. Being experimental, the name and behavior of this setting may change in a future release\.
+.IP "\(bu" 4
 \fBdefault_cli_command\fR (\fBBUNDLE_DEFAULT_CLI_COMMAND\fR): The command that running \fBbundle\fR without arguments should run\. Defaults to \fBcli_help\fR since Bundler 4, but can also be \fBinstall\fR which was the previous default\.
 .IP "\(bu" 4
 \fBdeployment\fR (\fBBUNDLE_DEPLOYMENT\fR): Equivalent to setting \fBfrozen\fR to \fBtrue\fR and \fBpath\fR to \fBvendor/bundle\fR\.

lib/bundler/man/bundle-config.1.ronn

@@ -167,6 +167,19 @@ learn more about their operation in [bundle install(1)](bundle-install.1.html).
    window and remain resolvable. If you rely on cooldown for
    supply-chain protection, confirm that the gem server emits
    `created_at` in its `/info/<gem>` responses.
+* `credential_store` (`BUNDLE_CREDENTIAL_STORE`):
+   Experimental: store and read host credentials (the values otherwise set
+   via `bundle config set <host> <user:pass>`) in a credential store instead
+   of the plain text config file. Set it to `true` to use the operating
+   system's native store (macOS Keychain, Linux Secret Service, Windows
+   Credential Manager) when one is available on this platform, or to the name
+   of a backend provided by a third-party gem, such as `1password`. Falls
+   back to the config file when the store is unavailable or fails, warning
+   that the credential was written in plain text. Defaults to false.
+   Credentials already written to the config file are not migrated
+   automatically; re-run `bundle config set <host> <user:pass>` with the
+   setting enabled to move each one into the store. Being experimental, the
+   name and behavior of this setting may change in a future release.
 * `default_cli_command` (`BUNDLE_DEFAULT_CLI_COMMAND`):
    The command that running `bundle` without arguments should run. Defaults to
    `cli_help` since Bundler 4, but can also be `install` which was the previous

lib/bundler/settings.rb

@@ -62,6 +62,7 @@ class Settings
       bin
       cache_path
       console
+      credential_store
       default_cli_command
       gem.ci
       gem.github_username
@@ -185,7 +186,7 @@ def mirror_for(uri)
     end
 
     def credentials_for(uri)
-      self[uri.to_s] || self[uri.host]
+      credentials_from_store(uri) || self[uri.to_s] || self[uri.host]
     end
 
     def gem_mirrors
@@ -389,6 +390,79 @@ def is_userinfo(value)
       value.include?(":")
     end
 
+    ##
+    # The Gem::CredentialStore instance to use, or nil when the
+    # `credential_store` setting is off. The value is `true`/`"true"` for this
+    # platform's native backend or a backend name such as `"1password"`.
+    # Guarded by a cheap lookup so reading and writing settings costs nothing
+    # extra when the setting is disabled.
+
+    # The account namespace Bundler uses in the shared native store, kept
+    # separate from RubyGems so that gem signout does not remove Bundler's
+    # host credentials.
+    CREDENTIAL_STORE_SERVICE = "bundler"
+
+    def active_credential_store
+      spec = credential_store_spec
+      return nil unless spec
+
+      store_class = credential_store_class
+      return nil unless store_class
+
+      store_class.for(spec, service: CREDENTIAL_STORE_SERVICE)
+    end
+
+    def credential_store_spec
+      case value = self[:credential_store]
+      when nil, "", "false", false then nil
+      when "true", true then true
+      else value.to_s
+      end
+    end
+
+    # The Gem::CredentialStore class, or nil when the paired RubyGems is too
+    # old to ship one. In that case the setting is honored as a no-op with a
+    # one-time warning so a bundle keeps using the config file instead of
+    # raising. Bundler can run on an older RubyGems than it was released with.
+    def credential_store_class
+      return @credential_store_class if defined?(@credential_store_class)
+
+      @credential_store_class =
+        begin
+          require "rubygems/credential_store"
+          Gem::CredentialStore if Gem::CredentialStore.respond_to?(:for)
+        rescue LoadError
+          nil
+        end
+
+      if @credential_store_class.nil?
+        Bundler.ui.warn "The `credential_store` setting is set but this RubyGems does not provide a credential store. Falling back to the Bundler config file."
+      end
+
+      @credential_store_class
+    end
+
+    ##
+    # True for keys that aren't reserved for a known bool/number/array/
+    # string setting (or the gem.push_key signing key path), i.e. keys
+    # that are eligible to be a host credential like the ones set via
+    # `bundle config set gems.example.com user:pass`. This mirrors the
+    # heuristic #printable_value already uses to decide whether to redact
+    # a value for display.
+
+    def credential_store_key?(raw_key)
+      !(is_bool(raw_key) || is_num(raw_key) || is_array(raw_key) || is_string(raw_key) || is_credential(raw_key))
+    end
+
+    def credentials_from_store(uri)
+      return nil unless store = active_credential_store
+
+      # Normalize with key_for so a value stored under, say,
+      # "https://host/" is found when the source URI is "https://host",
+      # exactly as the config-file path already matches via self[].
+      store.get(key_for(uri.to_s)) || store.get(key_for(uri.host))
+    end
+
     def to_array(value)
       return [] unless value
       value.tr(" ", ":").split(":").map(&:to_sym)
@@ -402,10 +476,24 @@ def array_to_s(array)
 
     def set_key(raw_key, value, hash, file)
       raw_key = self.class.key_to_s(raw_key)
-      value = array_to_s(value) if is_array(raw_key)
-
       key = key_for(raw_key)
 
+      if (store = active_credential_store) && credential_store_key?(raw_key)
+        if value.nil?
+          store.delete(key)
+        elsif value.is_a?(String) && is_userinfo(value)
+          if store.set(key, value)
+            # Stored in the credential store, so drop any plaintext copy left
+            # in this config file by falling through with a nil value.
+            value = nil
+          else
+            Bundler.ui.warn "Could not write the credential to the credential store, so it was written to the Bundler config file in plain text."
+          end
+        end
+      end
+
+      value = array_to_s(value) if is_array(raw_key)
+
       return if hash[key] == value
 
       hash[key] = value

lib/rubygems/commands/push_command.rb

@@ -17,7 +17,9 @@ def description # :nodoc:
 The gem can be removed from the index and deleted from the server using the yank
 command.  For further discussion see the help for the yank command.
 
-The push command will use ~/.gem/credentials to authenticate to a server, but you can use the RubyGems environment variable GEM_HOST_API_KEY to set the api key to authenticate.
+The push command will use ~/.gem/credentials to authenticate to a server, but you can use the RubyGems environment variable GEM_HOST_API_KEY to set the api key to authenticate. If the :credential_store: gemrc option (or RUBYGEMS_CREDENTIAL_STORE environment variable) is set, the API key is stored in and read from the credential store it selects instead of ~/.gem/credentials.
+
+The API key to send is resolved in this order: the GEM_HOST_API_KEY environment variable, the --key option, the credential store (when :credential_store: is set), then ~/.gem/credentials. The first one found is used.
     EOF
   end
 

lib/rubygems/commands/signin_command.rb

@@ -21,7 +21,9 @@ def description # :nodoc:
     "The signin command executes host sign in for a push server (the default is"\
     " https://rubygems.org). The host can be provided with the host flag or can"\
     " be inferred from the provided gem. Host resolution matches the resolution"\
-    " strategy for the push command."
+    " strategy for the push command. If the :credential_store: gemrc option (or"\
+    " RUBYGEMS_CREDENTIAL_STORE environment variable) is set, the resulting API key is"\
+    " stored in the credential store it selects instead of ~/.gem/credentials."
   end
 
   def usage # :nodoc:

lib/rubygems/commands/signout_command.rb

@@ -9,7 +9,10 @@ def initialize
 
   def description # :nodoc:
     "The `signout` command is used to sign out from all current sessions,"\
-    " allowing you to sign in using a different set of credentials."
+    " allowing you to sign in using a different set of credentials. It removes"\
+    " the ~/.gem/credentials file. If the :credential_store: gemrc option is"\
+    " set, it also removes every RubyGems key from the credential store,"\
+    " including keys saved for other hosts with `gem signin --host`."
   end
 
   def usage # :nodoc:
@@ -18,15 +21,16 @@ def usage # :nodoc:
 
   def execute
     credentials_path = Gem.configuration.credentials_path
+    credentials_file_exists = File.exist?(credentials_path)
 
-    if !File.exist?(credentials_path)
+    if !credentials_file_exists && !Gem.configuration.credential_store
       alert_error "You are not currently signed in."
-    elsif !File.writable?(credentials_path)
+    elsif credentials_file_exists && !File.writable?(credentials_path)
       alert_error "File '#{Gem.configuration.credentials_path}' is read-only."\
                   " Please make sure it is writable."
     else
       Gem.configuration.unset_api_key!
-      say "You have successfully signed out from all sessions."
+      say "You have successfully signed out of every registry, including RubyGems.org."
     end
   end
 end