server

package
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 Go to latest Published: Jun 20, 2023 License: MIT Imports: 26 Imported by: 0

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Constants

This section is empty.

Variables

View Source 
var (
	ErrAccessDenied           = errors.New("access denied")
	ErrAccessDeniedNoPassword = fmt.Errorf("%w without password", ErrAccessDenied)
)

Functions

func NewServerTLSConfig 

func NewServerTLSConfig(caPem, certPem, keyPem []byte, authType tls.ClientAuthType) *tls.Config

NewServerTLSConfig: generate TLS config for server side controlling the security level by authType

Types

type Conn 

type Conn struct {
	*packet.Conn
	// contains filtered or unexported fields
}

Conn acts like a MySQL server connection, you can use MySQL client to communicate with it.

func NewConn 

func NewConn(conn net.Conn, user string, password string, h Handler) (*Conn, error)

NewConn: create connection with default server settings

func NewCustomizedConn 

func NewCustomizedConn(conn net.Conn, serverConf *Server, p CredentialProvider, h Handler) (*Conn, error)

NewCustomizedConn: create connection with customized server settings

func (*Conn) Attributes 

func (c *Conn) Attributes() map[string]string

func (*Conn) Capability 

func (c *Conn) Capability() uint32

func (*Conn) Charset 

func (c *Conn) Charset() uint8

func (*Conn) ClearInTransaction 

func (c *Conn) ClearInTransaction()

func (*Conn) Close 

func (c *Conn) Close()

func (*Conn) Closed 

func (c *Conn) Closed() bool

func (*Conn) ConnectionID 

func (c *Conn) ConnectionID() uint32

func (*Conn) GetUser 

func (c *Conn) GetUser() string

func (*Conn) HandleCommand 

func (c *Conn) HandleCommand() error

func (*Conn) HasCapability 

func (c *Conn) HasCapability(cap uint32) bool

func (*Conn) HasStatus 

func (c *Conn) HasStatus(status uint16) bool

func (*Conn) IsAutoCommit 

func (c *Conn) IsAutoCommit() bool

func (*Conn) IsInTransaction 

func (c *Conn) IsInTransaction() bool

func (*Conn) SetCapability 

func (c *Conn) SetCapability(cap uint32)

func (*Conn) SetInTransaction 

func (c *Conn) SetInTransaction()

func (*Conn) SetStatus 

func (c *Conn) SetStatus(status uint16)

func (*Conn) SetWarnings 

func (c *Conn) SetWarnings(warnings uint16)

func (*Conn) UnsetCapability 

func (c *Conn) UnsetCapability(cap uint32)

func (*Conn) UnsetStatus 

func (c *Conn) UnsetStatus(status uint16)

func (*Conn) WriteValue 

func (c *Conn) WriteValue(value interface{}) error

type CredentialProvider 

type CredentialProvider interface {
	// check if the user exists
	CheckUsername(username string) (bool, error)
	// get user credential
	GetCredential(username string) (password string, found bool, err error)
}

interface for user credential provider hint: can be extended for more functionality =================================IMPORTANT NOTE=============================== if the password in a third-party credential provider could be updated at runtime, we have to invalidate the caching for 'caching_sha2_password' by calling 'func (s *Server)InvalidateCache(string, string)'.

type EmptyHandler 

type EmptyHandler struct {
}

func (EmptyHandler) HandleFieldList 

func (h EmptyHandler) HandleFieldList(table string, fieldWildcard string) ([]*Field, error)

func (EmptyHandler) HandleOtherCommand 

func (h EmptyHandler) HandleOtherCommand(cmd byte, data []byte) error

func (EmptyHandler) HandleQuery 

func (h EmptyHandler) HandleQuery(query string) (*Result, error)

func (EmptyHandler) HandleStmtClose 

func (h EmptyHandler) HandleStmtClose(context interface{}) error

func (EmptyHandler) HandleStmtExecute 

func (h EmptyHandler) HandleStmtExecute(context interface{}, query string, args []interface{}) (*Result, error)

func (EmptyHandler) HandleStmtPrepare 

func (h EmptyHandler) HandleStmtPrepare(query string) (int, int, interface{}, error)

func (EmptyHandler) UseDB 

func (h EmptyHandler) UseDB(dbName string) error

type EmptyReplicationHandler 

type EmptyReplicationHandler struct {
	EmptyHandler
}

func (EmptyReplicationHandler) HandleBinlogDump 

func (h EmptyReplicationHandler) HandleBinlogDump(pos Position) (*replication.BinlogStreamer, error)

func (EmptyReplicationHandler) HandleBinlogDumpGTID 

func (h EmptyReplicationHandler) HandleBinlogDumpGTID(gtidSet *MysqlGTIDSet) (*replication.BinlogStreamer, error)

func (EmptyReplicationHandler) HandleRegisterSlave 

func (h EmptyReplicationHandler) HandleRegisterSlave(data []byte) error

type Handler 

type Handler interface {
	//handle COM_INIT_DB command, you can check whether the dbName is valid, or other.
	UseDB(dbName string) error
	//handle COM_QUERY command, like SELECT, INSERT, UPDATE, etc...
	//If Result has a Resultset (SELECT, SHOW, etc...), we will send this as the response, otherwise, we will send Result
	HandleQuery(query string) (*Result, error)
	//handle COM_FILED_LIST command
	HandleFieldList(table string, fieldWildcard string) ([]*Field, error)
	//handle COM_STMT_PREPARE, params is the param number for this statement, columns is the column number
	//context will be used later for statement execute
	HandleStmtPrepare(query string) (params int, columns int, context interface{}, err error)
	//handle COM_STMT_EXECUTE, context is the previous one set in prepare
	//query is the statement prepare query, and args is the params for this statement
	HandleStmtExecute(context interface{}, query string, args []interface{}) (*Result, error)
	//handle COM_STMT_CLOSE, context is the previous one set in prepare
	//this handler has no response
	HandleStmtClose(context interface{}) error
	//handle any other command that is not currently handled by the library,
	//default implementation for this method will return an ER_UNKNOWN_ERROR
	HandleOtherCommand(cmd byte, data []byte) error
}

type InMemoryProvider 

type InMemoryProvider struct {
	// contains filtered or unexported fields
}

implements a in memory credential provider

func NewInMemoryProvider 

func NewInMemoryProvider() *InMemoryProvider

func (*InMemoryProvider) AddUser 

func (m *InMemoryProvider) AddUser(username, password string)

func (*InMemoryProvider) CheckUsername 

func (m *InMemoryProvider) CheckUsername(username string) (found bool, err error)

func (*InMemoryProvider) GetCredential 

func (m *InMemoryProvider) GetCredential(username string) (password string, found bool, err error)

type Provider 

type Provider InMemoryProvider

type ReplicationHandler 

type ReplicationHandler interface {
	// handle Replication command
	HandleRegisterSlave(data []byte) error
	HandleBinlogDump(pos Position) (*replication.BinlogStreamer, error)
	HandleBinlogDumpGTID(gtidSet *MysqlGTIDSet) (*replication.BinlogStreamer, error)
}

type Server 

type Server struct {
	// contains filtered or unexported fields
}

Defines a basic MySQL server with configs.

We do not aim at implementing the whole MySQL connection suite to have the best compatibilities for the clients. The MySQL server can be configured to switch auth methods covering 'mysql_old_password', 'mysql_native_password', 'mysql_clear_password', 'authentication_windows_client', 'sha256_password', 'caching_sha2_password', etc.

However, since some old auth methods are considered broken with security issues. MySQL major versions like 5.7 and 8.0 default to 'mysql_native_password' or 'caching_sha2_password', and most MySQL clients should have already supported at least one of the three auth methods 'mysql_native_password', 'caching_sha2_password', and 'sha256_password'. Thus here we will only support these three auth methods, and use 'mysql_native_password' as default for maximum compatibility with the clients and leave the other two as config options.

The MySQL doc states that 'mysql_old_password' will be used if 'CLIENT_PROTOCOL_41' or 'CLIENT_SECURE_CONNECTION' flag is not set. We choose to drop the support for insecure 'mysql_old_password' auth method and require client capability 'CLIENT_PROTOCOL_41' and 'CLIENT_SECURE_CONNECTION' are set. Besides, if 'CLIENT_PLUGIN_AUTH' is not set, we fallback to 'mysql_native_password' auth method.

func NewDefaultServer 

func NewDefaultServer() *Server

NewDefaultServer: New mysql server with default settings.

NOTES: TLS support will be enabled by default with auto-generated CA and server certificates (however, you can still use non-TLS connection). By default, it will verify the client certificate if present. You can enable TLS support on the client side without providing a client-side certificate. So only when you need the server to verify client identity for maximum security, you need to set a signed certificate for the client.

func NewServer 

func NewServer(serverVersion string, collationId uint8, defaultAuthMethod string, pubKey []byte, tlsConfig *tls.Config) *Server

NewServer: New mysql server with customized settings.

NOTES: You can control the authentication methods and TLS settings here. For auth method, you can specify one of the supported methods 'mysql_native_password', 'caching_sha2_password', and 'sha256_password'. The specified auth method will be enforced by the server in the connection phase. That means, client will be asked to switch auth method if the supplied auth method is different from the server default. And for TLS support, you can specify self-signed or CA-signed certificates and decide whether the client needs to provide a signed or unsigned certificate to provide different level of security.

func (*Server) InvalidateCache 

func (s *Server) InvalidateCache(username string, host string)

type Stmt 

type Stmt struct {
	ID    uint32
	Query string

	Params  int
	Columns int

	Args []interface{}

	Context interface{}
}

func (*Stmt) ResetParams 

func (s *Stmt) ResetParams()

func (*Stmt) Rest 

func (s *Stmt) Rest(params int, columns int, context interface{})

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