chasquid: Dovecot support (experimental)

This patch adds dovecot support to the chasquid daemon, using the
internal dovecot library added in previous patches.

Dovecot support is still considered EXPERIMENTAL and may be reverted, or
changed in backwards-incompatible ways.

The patch also adds the corresponding integration test, which brings up
a dovecot server with a custom configuration, and tests chasquid's
authentication against it.  If dovecot is not installed, the test is
skipped.

internal/config/config.go

@@ -93,4 +93,6 @@ func LogConfig(c *Config) {
 	log.Infof("  Suffix separators: %s", c.SuffixSeparators)
 	log.Infof("  Drop characters: %s", c.DropCharacters)
 	log.Infof("  Mail log: %s", c.MailLogPath)
+	log.Infof("  Dovecot auth: %v (%q, %q)",
+		c.DovecotAuth, c.DovecotUserdbPath, c.DovecotClientPath)
 }

internal/config/config.pb.go

@@ -90,6 +90,18 @@ type Config struct {
 	// If "<syslog>", log using the syslog (at MAIL|INFO priority).
 	// Default: <syslog>
 	MailLogPath string `protobuf:"bytes,12,opt,name=mail_log_path,json=mailLogPath" json:"mail_log_path,omitempty"`
+	// EXPERIMENTAL - Enable dovecot authentication.
+	// Domains that don't have an user database will be authenticated via
+	// dovecot.
+	DovecotAuth bool `protobuf:"varint,13,opt,name=dovecot_auth,json=dovecotAuth" json:"dovecot_auth,omitempty"`
+	// EXPERIMENTAL - Dovecot userdb path. If dovecot_auth is set and this
+	// is not, we will try to autodetect it.
+	// Example: /var/run/dovecot/auth-userdb
+	DovecotUserdbPath string `protobuf:"bytes,14,opt,name=dovecot_userdb_path,json=dovecotUserdbPath" json:"dovecot_userdb_path,omitempty"`
+	// EXPERIMENTAL - Dovecot client path. If dovecot_auth is set and this
+	// is not, we will try to autodetect it.
+	// Example: /var/run/dovecot/auth-client
+	DovecotClientPath string `protobuf:"bytes,15,opt,name=dovecot_client_path,json=dovecotClientPath" json:"dovecot_client_path,omitempty"`
 }
 
 func (m *Config) Reset()                    { *m = Config{} }
@@ -104,27 +116,31 @@ func init() {
 func init() { proto.RegisterFile("config.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
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+	// 409 bytes of a gzipped FileDescriptorProto
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 }

internal/config/config.proto

@@ -74,5 +74,19 @@ message Config {
 	// If "<syslog>", log using the syslog (at MAIL|INFO priority).
 	// Default: <syslog>
 	string mail_log_path = 12;
-}
 
+	// EXPERIMENTAL - Enable dovecot authentication.
+	// Domains that don't have an user database will be authenticated via
+	// dovecot.
+	bool dovecot_auth = 13;
+
+	// EXPERIMENTAL - Dovecot userdb path. If dovecot_auth is set and this
+	// is not, we will try to autodetect it.
+	// Example: /var/run/dovecot/auth-userdb
+	string dovecot_userdb_path = 14;
+
+	// EXPERIMENTAL - Dovecot client path. If dovecot_auth is set and this
+	// is not, we will try to autodetect it.
+	// Example: /var/run/dovecot/auth-client
+	string dovecot_client_path = 15;
+}