protocol

package
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 Go to latest Published: May 3, 2018 License: GPL-3.0 Imports: 11 Imported by: 0

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Index

Constants

View Source 
const (
	TUNNEL_PROTOCOL_SSH                           = "SSH"
	TUNNEL_PROTOCOL_OBFUSCATED_SSH                = "OSSH"
	TUNNEL_PROTOCOL_UNFRONTED_MEEK                = "UNFRONTED-MEEK-OSSH"
	TUNNEL_PROTOCOL_UNFRONTED_MEEK_HTTPS          = "UNFRONTED-MEEK-HTTPS-OSSH"
	TUNNEL_PROTOCOL_UNFRONTED_MEEK_SESSION_TICKET = "UNFRONTED-MEEK-SESSION-TICKET-OSSH"
	TUNNEL_PROTOCOL_FRONTED_MEEK                  = "FRONTED-MEEK-OSSH"
	TUNNEL_PROTOCOL_FRONTED_MEEK_HTTP             = "FRONTED-MEEK-HTTP-OSSH"

	SERVER_ENTRY_SOURCE_EMBEDDED   = "EMBEDDED"
	SERVER_ENTRY_SOURCE_REMOTE     = "REMOTE"
	SERVER_ENTRY_SOURCE_DISCOVERY  = "DISCOVERY"
	SERVER_ENTRY_SOURCE_TARGET     = "TARGET"
	SERVER_ENTRY_SOURCE_OBFUSCATED = "OBFUSCATED"

	CAPABILITY_SSH_API_REQUESTS            = "ssh-api-requests"
	CAPABILITY_UNTUNNELED_WEB_API_REQUESTS = "handshake"

	CLIENT_CAPABILITY_SERVER_REQUESTS = "server-requests"

	PSIPHON_API_HANDSHAKE_REQUEST_NAME           = "psiphon-handshake"
	PSIPHON_API_CONNECTED_REQUEST_NAME           = "psiphon-connected"
	PSIPHON_API_STATUS_REQUEST_NAME              = "psiphon-status"
	PSIPHON_API_CLIENT_VERIFICATION_REQUEST_NAME = "psiphon-client-verification"
	PSIPHON_API_OSL_REQUEST_NAME                 = "psiphon-osl"

	PSIPHON_API_CLIENT_SESSION_ID_LENGTH = 16

	PSIPHON_SSH_API_PROTOCOL = "ssh"
	PSIPHON_WEB_API_PROTOCOL = "web"

	PACKET_TUNNEL_CHANNEL_TYPE = "tun@psiphon.ca"

	PSIPHON_API_HANDSHAKE_AUTHORIZATIONS = "authorizations"
)

Variables

View Source 
var SupportedServerEntrySources = TunnelProtocols{
	SERVER_ENTRY_SOURCE_EMBEDDED,
	SERVER_ENTRY_SOURCE_REMOTE,
	SERVER_ENTRY_SOURCE_DISCOVERY,
	SERVER_ENTRY_SOURCE_TARGET,
	SERVER_ENTRY_SOURCE_OBFUSCATED,
}
View Source 
var SupportedTunnelProtocols = TunnelProtocols{
	TUNNEL_PROTOCOL_FRONTED_MEEK,
	TUNNEL_PROTOCOL_FRONTED_MEEK_HTTP,
	TUNNEL_PROTOCOL_UNFRONTED_MEEK,
	TUNNEL_PROTOCOL_UNFRONTED_MEEK_HTTPS,
	TUNNEL_PROTOCOL_UNFRONTED_MEEK_SESSION_TICKET,
	TUNNEL_PROTOCOL_OBFUSCATED_SSH,
	TUNNEL_PROTOCOL_SSH,
}

Functions

func EncodeServerEntry 

func EncodeServerEntry(serverEntry *ServerEntry) (string, error)

EncodeServerEntry returns a string containing the encoding of a ServerEntry following Psiphon conventions.

func GetCapability 

func GetCapability(protocol string) string

GetCapability returns the server capability corresponding to the tunnel protocol.

func GetTacticsCapability 

func GetTacticsCapability(protocol string) string

GetTacticsCapability returns the server tactics capability corresponding to the tunnel protocol.

func TunnelProtocolUsesMeek 

func TunnelProtocolUsesMeek(protocol string) bool

func TunnelProtocolUsesMeekHTTP 

func TunnelProtocolUsesMeekHTTP(protocol string) bool

func TunnelProtocolUsesMeekHTTPS 

func TunnelProtocolUsesMeekHTTPS(protocol string) bool

func TunnelProtocolUsesObfuscatedSSH 

func TunnelProtocolUsesObfuscatedSSH(protocol string) bool

func TunnelProtocolUsesObfuscatedSessionTickets 

func TunnelProtocolUsesObfuscatedSessionTickets(protocol string) bool

func TunnelProtocolUsesSSH 

func TunnelProtocolUsesSSH(protocol string) bool

func UseClientTunnelProtocol 

func UseClientTunnelProtocol(
	clientProtocol string,
	serverProtocols TunnelProtocols) bool

func ValidateServerEntry 

func ValidateServerEntry(serverEntry *ServerEntry) error

ValidateServerEntry checks for malformed server entries. Currently, it checks for a valid ipAddress. This is important since the IP address is the key used to store/lookup the server entry. TODO: validate more fields?

Types

type ConnectedResponse 

type ConnectedResponse struct {
	ConnectedTimestamp string `json:"connected_timestamp"`
}

type HandshakeResponse 

type HandshakeResponse struct {
	SSHSessionID           string              `json:"ssh_session_id"`
	Homepages              []string            `json:"homepages"`
	UpgradeClientVersion   string              `json:"upgrade_client_version"`
	PageViewRegexes        []map[string]string `json:"page_view_regexes"`
	HttpsRequestRegexes    []map[string]string `json:"https_request_regexes"`
	EncodedServerList      []string            `json:"encoded_server_list"`
	ClientRegion           string              `json:"client_region"`
	ServerTimestamp        string              `json:"server_timestamp"`
	ActiveAuthorizationIDs []string            `json:"active_authorization_ids"`
	TacticsPayload         json.RawMessage     `json:"tactics_payload"`
}

type MeekCookieData 

type MeekCookieData struct {
	MeekProtocolVersion  int    `json:"v"`
	ClientTunnelProtocol string `json:"t"`
	EndPoint             string `json:"e"`
}

type OSLRequest 

type OSLRequest struct {
	ClearLocalSLOKs bool             `json:"clear_local_sloks"`
	SeedPayload     *osl.SeedPayload `json:"seed_payload"`
}

type SSHPasswordPayload 

type SSHPasswordPayload struct {
	SessionId          string   `json:"SessionId"`
	SshPassword        string   `json:"SshPassword"`
	ClientCapabilities []string `json:"ClientCapabilities"`
}

type ServerEntry 

type ServerEntry struct {
	IpAddress                     string   `json:"ipAddress"`
	WebServerPort                 string   `json:"webServerPort"` // not an int
	WebServerSecret               string   `json:"webServerSecret"`
	WebServerCertificate          string   `json:"webServerCertificate"`
	SshPort                       int      `json:"sshPort"`
	SshUsername                   string   `json:"sshUsername"`
	SshPassword                   string   `json:"sshPassword"`
	SshHostKey                    string   `json:"sshHostKey"`
	SshObfuscatedPort             int      `json:"sshObfuscatedPort"`
	SshObfuscatedKey              string   `json:"sshObfuscatedKey"`
	Capabilities                  []string `json:"capabilities"`
	Region                        string   `json:"region"`
	MeekServerPort                int      `json:"meekServerPort"`
	MeekCookieEncryptionPublicKey string   `json:"meekCookieEncryptionPublicKey"`
	MeekObfuscatedKey             string   `json:"meekObfuscatedKey"`
	MeekFrontingHost              string   `json:"meekFrontingHost"`
	MeekFrontingHosts             []string `json:"meekFrontingHosts"`
	MeekFrontingDomain            string   `json:"meekFrontingDomain"`
	MeekFrontingAddresses         []string `json:"meekFrontingAddresses"`
	MeekFrontingAddressesRegex    string   `json:"meekFrontingAddressesRegex"`
	MeekFrontingDisableSNI        bool     `json:"meekFrontingDisableSNI"`
	TacticsRequestPublicKey       string   `json:"tacticsRequestPublicKey"`
	TacticsRequestObfuscatedKey   string   `json:"tacticsRequestObfuscatedKey"`
	ConfigurationVersion          int      `json:"configurationVersion"`

	// These local fields are not expected to be present in downloaded server
	// entries. They are added by the client to record and report stats about
	// how and when server entries are obtained.
	LocalSource    string `json:"localSource"`
	LocalTimestamp string `json:"localTimestamp"`
}

ServerEntry represents a Psiphon server. It contains information about how to establish a tunnel connection to the server through several protocols. Server entries are JSON records downloaded from various sources.

func DecodeServerEntry 

func DecodeServerEntry(
	encodedServerEntry, timestamp,
	serverEntrySource string) (serverEntry *ServerEntry, err error)

DecodeServerEntry extracts server entries from the encoding used by remote server lists and Psiphon server handshake requests.

The resulting ServerEntry.LocalSource is populated with serverEntrySource, which should be one of SERVER_ENTRY_SOURCE_EMBEDDED, SERVER_ENTRY_SOURCE_REMOTE, SERVER_ENTRY_SOURCE_DISCOVERY, SERVER_ENTRY_SOURCE_TARGET, SERVER_ENTRY_SOURCE_OBFUSCATED. ServerEntry.LocalTimestamp is populated with the provided timestamp, which should be a RFC 3339 formatted string. These local fields are stored with the server entry and reported to the server as stats (a coarse granularity timestamp is reported).

func DecodeServerEntryList 

func DecodeServerEntryList(
	encodedServerEntryList, timestamp,
	serverEntrySource string) (serverEntries []*ServerEntry, err error)

DecodeServerEntryList extracts server entries from the list encoding used by remote server lists and Psiphon server handshake requests. Each server entry is validated and invalid entries are skipped. See DecodeServerEntry for note on serverEntrySource/timestamp.

func (*ServerEntry) GetSupportedProtocols 

func (serverEntry *ServerEntry) GetSupportedProtocols(
	limitTunnelProtocols []string,
	impairedTunnelProtocols []string,
	excludeMeek bool) []string

GetSupportedProtocols returns a list of tunnel protocols supported by the ServerEntry's capabilities.

func (*ServerEntry) GetSupportedTacticsProtocols 

func (serverEntry *ServerEntry) GetSupportedTacticsProtocols() []string

GetSupportedTacticsProtocols returns a list of tunnel protocols, supported by the ServerEntry's capabilities, that may be used for tactics requests.

func (*ServerEntry) GetUntunneledWebRequestPorts 

func (serverEntry *ServerEntry) GetUntunneledWebRequestPorts() []string

func (*ServerEntry) SupportsProtocol 

func (serverEntry *ServerEntry) SupportsProtocol(protocol string) bool

SupportsProtocol returns true if and only if the ServerEntry has the necessary capability to support the specified tunnel protocol.

func (*ServerEntry) SupportsSSHAPIRequests 

func (serverEntry *ServerEntry) SupportsSSHAPIRequests() bool

SupportsSSHAPIRequests returns true when the server supports SSH API requests.

type StreamingServerEntryDecoder 

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

StreamingServerEntryDecoder performs the DecodeServerEntryList operation, loading only one server entry into memory at a time.

func NewStreamingServerEntryDecoder 

func NewStreamingServerEntryDecoder(
	encodedServerEntryListReader io.Reader,
	timestamp, serverEntrySource string) *StreamingServerEntryDecoder

NewStreamingServerEntryDecoder creates a new StreamingServerEntryDecoder.

func (*StreamingServerEntryDecoder) Next 

func (decoder *StreamingServerEntryDecoder) Next() (*ServerEntry, error)

Next reads and decodes, and validates the next server entry from the input stream, returning a nil server entry when the stream is complete.

Limitations:

  • Each encoded server entry line cannot exceed bufio.MaxScanTokenSize, the default buffer size which this decoder uses. This is 64K.
  • DecodeServerEntry is called on each encoded server entry line, which will allocate memory to hex decode and JSON deserialze the server entry. As this is not presently reusing a fixed buffer, each call will allocate additional memory; garbage collection is necessary to reclaim that memory for reuse for the next server entry.

type TunnelProtocols 

type TunnelProtocols []string

func (TunnelProtocols) Validate 

func (t TunnelProtocols) Validate() error

Source Files

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