feat: 实现 LDAP 登录

server/pkg/ldap/ldap.go

@@ -0,0 +1,107 @@
+package ldap
+
+import (
+	"crypto/tls"
+	"fmt"
+	"github.com/go-ldap/ldap/v3"
+	"github.com/pkg/errors"
+	"mayfly-go/pkg/config"
+	"strings"
+)
+
+type UserInfo struct {
+	UserName    string
+	DisplayName string
+	Email       string
+}
+
+func dial() (*ldap.Conn, error) {
+	conf := config.Conf.Ldap
+	addr := fmt.Sprintf("%s:%d", conf.Host, conf.Port)
+	tlsConfig := &tls.Config{
+		ServerName:         conf.Host,
+		InsecureSkipVerify: conf.SkipTLSVerify,
+	}
+	if conf.SecurityProtocol == config.SecurityProtocolLDAPS {
+		conn, err := ldap.DialTLS("tcp", addr, tlsConfig)
+		if err != nil {
+			return nil, errors.Errorf("dial TLS: %v", err)
+		}
+		return conn, nil
+	}
+
+	conn, err := ldap.Dial("tcp", addr)
+	if err != nil {
+		return nil, errors.Errorf("dial: %v", err)
+	}
+	if conf.SecurityProtocol == config.SecurityProtocolStartTLS {
+		if err = conn.StartTLS(tlsConfig); err != nil {
+			_ = conn.Close()
+			return nil, errors.Errorf("start TLS: %v", err)
+		}
+	}
+	return conn, nil
+}
+
+// Connect 创建 LDAP 连接
+func Connect() (*ldap.Conn, error) {
+	conn, err := dial()
+	if err != nil {
+		return nil, err
+	}
+
+	// Bind with a system account
+	conf := config.Conf.Ldap
+	err = conn.Bind(conf.BindDN, conf.BindPassword)
+	if err != nil {
+		_ = conn.Close()
+		return nil, errors.Errorf("bind: %v", err)
+	}
+	return conn, nil
+}
+
+// Authenticate 通过 LDAP 验证用户名密码
+func Authenticate(username, password string) (*UserInfo, error) {
+	conn, err := Connect()
+	if err != nil {
+		return nil, errors.Errorf("connect: %v", err)
+	}
+	defer func() { _ = conn.Close() }()
+
+	conf := config.Conf.Ldap
+	sr, err := conn.Search(
+		ldap.NewSearchRequest(
+			conf.BaseDN,
+			ldap.ScopeWholeSubtree,
+			ldap.NeverDerefAliases,
+			0,
+			0,
+			false,
+			strings.ReplaceAll(conf.UserFilter, "%s", username),
+			[]string{"dn", conf.FieldMapping.Identifier, conf.FieldMapping.DisplayName, conf.FieldMapping.Email},
+			nil,
+		),
+	)
+	if err != nil {
+		return nil, errors.Errorf("search user DN: %v", err)
+	} else if len(sr.Entries) != 1 {
+		return nil, errors.Errorf("expect 1 user DN but got %d", len(sr.Entries))
+	}
+	entry := sr.Entries[0]
+
+	// Bind as the user to verify their password
+	err = conn.Bind(entry.DN, password)
+	if err != nil {
+		return nil, errors.Errorf("bind user: %v", err)
+	}
+
+	userName := entry.GetAttributeValue(conf.FieldMapping.Identifier)
+	if userName == "" {
+		return nil, errors.Errorf("the attribute %q is not found or has empty value", conf.FieldMapping.Identifier)
+	}
+	return &UserInfo{
+		UserName:    userName,
+		DisplayName: entry.GetAttributeValue(conf.FieldMapping.DisplayName),
+		Email:       entry.GetAttributeValue(conf.FieldMapping.Email),
+	}, nil
+}