protocol

package
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 Go to latest Published: Aug 16, 2022 License: GPL-3.0 Imports: 19 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"
	TUNNEL_PROTOCOL_QUIC_OBFUSCATED_SSH              = "QUIC-OSSH"
	TUNNEL_PROTOCOL_FRONTED_MEEK_QUIC_OBFUSCATED_SSH = "FRONTED-MEEK-QUIC-OSSH"
	TUNNEL_PROTOCOL_TAPDANCE_OBFUSCATED_SSH          = "TAPDANCE-OSSH"
	TUNNEL_PROTOCOL_CONJURE_OBFUSCATED_SSH           = "CONJURE-OSSH"

	TUNNEL_PROTOCOLS_ALL = "All"

	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"
	SERVER_ENTRY_SOURCE_EXCHANGED  = "EXCHANGED"

	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_OSL_REQUEST_NAME       = "psiphon-osl"
	PSIPHON_API_ALERT_REQUEST_NAME     = "psiphon-alert"

	PSIPHON_API_ALERT_DISALLOWED_TRAFFIC = "disallowed-traffic"
	PSIPHON_API_ALERT_UNSAFE_TRAFFIC     = "unsafe-traffic"

	// PSIPHON_API_CLIENT_VERIFICATION_REQUEST_NAME may still be used by older Android clients
	PSIPHON_API_CLIENT_VERIFICATION_REQUEST_NAME = "psiphon-client-verification"

	PSIPHON_API_CLIENT_SESSION_ID_LENGTH = 16

	PSIPHON_SSH_API_PROTOCOL = "ssh"
	PSIPHON_WEB_API_PROTOCOL = "web"

	PACKET_TUNNEL_CHANNEL_TYPE            = "tun@psiphon.ca"
	RANDOM_STREAM_CHANNEL_TYPE            = "random@psiphon.ca"
	TCP_PORT_FORWARD_NO_SPLIT_TUNNEL_TYPE = "direct-tcpip-no-split-tunnel@psiphon.ca"

	// Reject reason codes are returned in SSH open channel responses.
	//
	// Values 0xFE000000 to 0xFFFFFFFF are reserved for "PRIVATE USE" (see
	// https://tools.ietf.org/rfc/rfc4254.html#section-5.1).
	CHANNEL_REJECT_REASON_SPLIT_TUNNEL = 0xFE000000

	PSIPHON_API_HANDSHAKE_AUTHORIZATIONS = "authorizations"

	CONJURE_TRANSPORT_MIN_OSSH   = "Min-OSSH"
	CONJURE_TRANSPORT_OBFS4_OSSH = "Obfs4-OSSH"
)
View Source 
const (
	TLS_VERSION_12 = "TLSv1.2"
	TLS_VERSION_13 = "TLSv1.3"

	TLS_PROFILE_IOS_111    = "iOS-11.1"
	TLS_PROFILE_IOS_121    = "iOS-12.1"
	TLS_PROFILE_CHROME_58  = "Chrome-58"
	TLS_PROFILE_CHROME_62  = "Chrome-62"
	TLS_PROFILE_CHROME_70  = "Chrome-70"
	TLS_PROFILE_CHROME_72  = "Chrome-72"
	TLS_PROFILE_CHROME_83  = "Chrome-83"
	TLS_PROFILE_FIREFOX_55 = "Firefox-55"
	TLS_PROFILE_FIREFOX_56 = "Firefox-56"
	TLS_PROFILE_FIREFOX_65 = "Firefox-65"
	TLS_PROFILE_RANDOMIZED = "Randomized-v2"
)
View Source 
const (
	QUIC_VERSION_GQUIC39       = "gQUICv39"
	QUIC_VERSION_GQUIC43       = "gQUICv43"
	QUIC_VERSION_GQUIC44       = "gQUICv44"
	QUIC_VERSION_OBFUSCATED    = "OBFUSCATED"
	QUIC_VERSION_V1            = "QUICv1"
	QUIC_VERSION_RANDOMIZED_V1 = "RANDOMIZED-QUICv1"
	QUIC_VERSION_OBFUSCATED_V1 = "OBFUSCATED-QUICv1"
	QUIC_VERSION_DECOY_V1      = "DECOY-QUICv1"
)

Variables

View Source 
var DefaultDisabledTunnelProtocols = TunnelProtocols{
	TUNNEL_PROTOCOL_FRONTED_MEEK_QUIC_OBFUSCATED_SSH,
	TUNNEL_PROTOCOL_TAPDANCE_OBFUSCATED_SSH,
	TUNNEL_PROTOCOL_CONJURE_OBFUSCATED_SSH,
}
View Source 
var SupportedQUICVersions = QUICVersions{
	QUIC_VERSION_GQUIC39,
	QUIC_VERSION_GQUIC43,
	QUIC_VERSION_GQUIC44,
	QUIC_VERSION_OBFUSCATED,
	QUIC_VERSION_V1,
	QUIC_VERSION_RANDOMIZED_V1,
	QUIC_VERSION_OBFUSCATED_V1,
	QUIC_VERSION_DECOY_V1,
}
View Source 
var SupportedQUICv1Versions = QUICVersions{
	QUIC_VERSION_V1,
	QUIC_VERSION_RANDOMIZED_V1,
	QUIC_VERSION_OBFUSCATED_V1,
	QUIC_VERSION_DECOY_V1,
}
View Source 
var SupportedServerEntrySources = []string{
	SERVER_ENTRY_SOURCE_EMBEDDED,
	SERVER_ENTRY_SOURCE_REMOTE,
	SERVER_ENTRY_SOURCE_DISCOVERY,
	SERVER_ENTRY_SOURCE_TARGET,
	SERVER_ENTRY_SOURCE_OBFUSCATED,
	SERVER_ENTRY_SOURCE_EXCHANGED,
}
View Source 
var SupportedTLSProfiles = TLSProfiles{
	TLS_PROFILE_IOS_111,
	TLS_PROFILE_IOS_121,
	TLS_PROFILE_CHROME_58,
	TLS_PROFILE_CHROME_62,
	TLS_PROFILE_CHROME_70,
	TLS_PROFILE_CHROME_72,
	TLS_PROFILE_CHROME_83,
	TLS_PROFILE_FIREFOX_55,
	TLS_PROFILE_FIREFOX_56,
	TLS_PROFILE_FIREFOX_65,
	TLS_PROFILE_RANDOMIZED,
}
View Source 
var SupportedTunnelProtocols = TunnelProtocols{
	TUNNEL_PROTOCOL_SSH,
	TUNNEL_PROTOCOL_OBFUSCATED_SSH,
	TUNNEL_PROTOCOL_UNFRONTED_MEEK,
	TUNNEL_PROTOCOL_UNFRONTED_MEEK_HTTPS,
	TUNNEL_PROTOCOL_UNFRONTED_MEEK_SESSION_TICKET,
	TUNNEL_PROTOCOL_FRONTED_MEEK,
	TUNNEL_PROTOCOL_FRONTED_MEEK_HTTP,
	TUNNEL_PROTOCOL_QUIC_OBFUSCATED_SSH,
	TUNNEL_PROTOCOL_FRONTED_MEEK_QUIC_OBFUSCATED_SSH,
	TUNNEL_PROTOCOL_TAPDANCE_OBFUSCATED_SSH,
	TUNNEL_PROTOCOL_CONJURE_OBFUSCATED_SSH,
}

Functions

func AllowServerEntrySourceWithUpstreamProxy 

func AllowServerEntrySourceWithUpstreamProxy(source string) bool

func DeriveBPFServerProgramPRNGSeed 

func DeriveBPFServerProgramPRNGSeed(obfuscatedKey string) (*prng.Seed, error)

func DeriveSSHServerKEXPRNGSeed 

func DeriveSSHServerKEXPRNGSeed(obfuscatedKey string) (*prng.Seed, error)

func DeriveSSHServerVersionPRNGSeed 

func DeriveSSHServerVersionPRNGSeed(obfuscatedKey string) (*prng.Seed, error)

func EncodeServerEntry 

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

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

func EncodeServerEntryFields 

func EncodeServerEntryFields(serverEntryFields ServerEntryFields) (string, error)

EncodeServerEntryFields returns a string containing the encoding of ServerEntryFields following Psiphon conventions.

func GenerateServerEntryTag 

func GenerateServerEntryTag(ipAddress, webServerSecret string) string

GenerateServerEntryTag creates a server entry tag value that is cryptographically derived from the IP address and web server secret in a way that is difficult to reverse the IP address value from the tag or compute the tag without having the web server secret, a 256-bit random value which is unique per server, in addition to the IP address. A database consisting only of server entry tags should be resistent to an attack that attempts to reverse all the server IPs, even given a small IP space (IPv4), or some subset of the web server secrets.

func GetCapability 

func GetCapability(protocol string) string

GetCapability returns the server capability corresponding to the tunnel protocol.

func GetTacticsCapability added in v1.0.5 

func GetTacticsCapability(protocol string) string

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

func IsValidClientTunnelProtocol 

func IsValidClientTunnelProtocol(
	clientProtocol string,
	listenerProtocol string,
	serverProtocols TunnelProtocols) bool

func NewServerEntrySignatureKeyPair 

func NewServerEntrySignatureKeyPair() (string, string, error)

NewServerEntrySignatureKeyPair creates an ed25519 key pair for use in server entry signing and verification.

func QUICVersionHasRandomizedClientHello 

func QUICVersionHasRandomizedClientHello(version string) bool

func QUICVersionIsObfuscated added in v1.0.10 

func QUICVersionIsObfuscated(version string) bool

func QUICVersionUsesPathMTUDiscovery 

func QUICVersionUsesPathMTUDiscovery(version string) bool

func TLS12ProfileOmitsSessionTickets 

func TLS12ProfileOmitsSessionTickets(tlsProfile string) bool

func TLSProfileIsRandomized added in v1.0.10 

func TLSProfileIsRandomized(tlsProfile string) bool

func TagToDiagnosticID 

func TagToDiagnosticID(tag string) string

TagToDiagnosticID returns a prefix of the server entry tag that should be sufficient to uniquely identify servers in diagnostics, while also being more human readable than emitting the full tag. The tag is used as the base of the diagnostic ID as it doesn't leak the server IP address in diagnostic output.

func TunnelProtocolIsCompatibleWithFragmentor 

func TunnelProtocolIsCompatibleWithFragmentor(protocol string) bool

func TunnelProtocolIsResourceIntensive added in v1.0.7 

func TunnelProtocolIsResourceIntensive(protocol string) bool

func TunnelProtocolMayUseServerPacketManipulation 

func TunnelProtocolMayUseServerPacketManipulation(protocol string) bool

func TunnelProtocolRequiresTLS12SessionTickets 

func TunnelProtocolRequiresTLS12SessionTickets(protocol string) bool

func TunnelProtocolSupportsPassthrough 

func TunnelProtocolSupportsPassthrough(protocol string) bool

func TunnelProtocolSupportsUpstreamProxy 

func TunnelProtocolSupportsUpstreamProxy(protocol string) bool

func TunnelProtocolUsesConjure 

func TunnelProtocolUsesConjure(protocol string) bool

func TunnelProtocolUsesFrontedMeek added in v1.0.10 

func TunnelProtocolUsesFrontedMeek(protocol string) bool

func TunnelProtocolUsesFrontedMeekQUIC 

func TunnelProtocolUsesFrontedMeekQUIC(protocol string) bool

func TunnelProtocolUsesMeek added in v1.0.5 

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 TunnelProtocolUsesQUIC added in v1.0.7 

func TunnelProtocolUsesQUIC(protocol string) bool

func TunnelProtocolUsesRefractionNetworking 

func TunnelProtocolUsesRefractionNetworking(protocol string) bool

func TunnelProtocolUsesSSH 

func TunnelProtocolUsesSSH(protocol string) bool

func TunnelProtocolUsesTCP 

func TunnelProtocolUsesTCP(protocol string) bool

func TunnelProtocolUsesTapDance 

func TunnelProtocolUsesTapDance(protocol string) bool

func ValidateServerEntryFields added in v1.0.7 

func ValidateServerEntryFields(serverEntryFields ServerEntryFields) error

ValidateServerEntryFields checks for malformed server entries.

Types

type AlertRequest 

type AlertRequest struct {
	Reason     string   `json:"reason"`
	Subject    string   `json:"subject"`
	ActionURLs []string `json:"action"`
}

type ConditionallyEnabledComponents 

type ConditionallyEnabledComponents interface {
	QUICEnabled() bool
	RefractionNetworkingEnabled() bool
}

ConditionallyEnabledComponents defines an interface which can be queried to determine which conditionally compiled protocol components are present.

type ConnectedResponse 

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

type CustomTLSProfile 

type CustomTLSProfile struct {
	Name     string
	UTLSSpec *UTLSSpec
}

CustomTLSProfile specifies custom TLS profile. This is used to deploy custom ClientHellos as tactics data.

func (*CustomTLSProfile) GetClientHelloSpec 

func (profile *CustomTLSProfile) GetClientHelloSpec() (*utls.ClientHelloSpec, error)

GetClientHelloSpec creates a new utls.ClientHelloSpec from the ClientHello definition in UTLSpec.

A new utls.ClientHelloSpec, with no shared data, is created for each call, as per: https://github.com/refraction-networking/utls/blob/4da67951864128358459681399dd208c49d5d001/u_parrots.go#L483

type CustomTLSProfiles 

type CustomTLSProfiles []*CustomTLSProfile

func (CustomTLSProfiles) Validate 

func (profiles CustomTLSProfiles) Validate() error

Validate checks that the profiles in CustomTLSProfiles are initialized and have no name conflicts.

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"`
	ClientAddress            string              `json:"client_address"`
	ServerTimestamp          string              `json:"server_timestamp"`
	ActiveAuthorizationIDs   []string            `json:"active_authorization_ids"`
	TacticsPayload           json.RawMessage     `json:"tactics_payload"`
	UpstreamBytesPerSecond   int64               `json:"upstream_bytes_per_second"`
	DownstreamBytesPerSecond int64               `json:"downstream_bytes_per_second"`
	Padding                  string              `json:"padding"`
}

type LabeledQUICVersions 

type LabeledQUICVersions map[string]QUICVersions

func (LabeledQUICVersions) PruneInvalid 

func (labeledVersions LabeledQUICVersions) PruneInvalid() LabeledQUICVersions

func (LabeledQUICVersions) Validate 

func (labeledVersions LabeledQUICVersions) Validate() error

type LabeledTLSProfiles 

type LabeledTLSProfiles map[string]TLSProfiles

func (LabeledTLSProfiles) PruneInvalid 

func (labeledProfiles LabeledTLSProfiles) PruneInvalid(customTLSProfiles []string) LabeledTLSProfiles

func (LabeledTLSProfiles) Validate 

func (labeledProfiles LabeledTLSProfiles) Validate(customTLSProfiles []string) error

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 QUICVersions added in v1.0.9 

type QUICVersions []string

func (QUICVersions) PruneInvalid added in v1.0.9 

func (versions QUICVersions) PruneInvalid() QUICVersions

func (QUICVersions) Validate added in v1.0.9 

func (versions QUICVersions) Validate() error

type RandomStreamRequest added in v1.0.9 

type RandomStreamRequest struct {
	UpstreamBytes   int `json:"u"`
	DownstreamBytes int `json:"d"`
}

type SSHPasswordPayload 

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

type ServerEntry 

type ServerEntry struct {
	Tag                           string   `json:"tag"`
	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"`
	SshObfuscatedQUICPort         int      `json:"sshObfuscatedQUICPort"`
	LimitQUICVersions             []string `json:"limitQUICVersions"`
	SshObfuscatedTapDancePort     int      `json:"sshObfuscatedTapdancePort"`
	SshObfuscatedConjurePort      int      `json:"sshObfuscatedConjurePort"`
	SshObfuscatedKey              string   `json:"sshObfuscatedKey"`
	Capabilities                  []string `json:"capabilities"`
	Region                        string   `json:"region"`
	FrontingProviderID            string   `json:"frontingProviderID"`
	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"`
	Signature                     string   `json:"signature"`

	// 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.
	// All local fields should be included the list of fields in RemoveUnsignedFields.
	LocalSource       string `json:"localSource,omitempty"`
	LocalTimestamp    string `json:"localTimestamp,omitempty"`
	IsLocalDerivedTag bool   `json:"isLocalDerivedTag,omitempty"`
}

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, error)

DecodeServerEntry extracts a server entry 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 (*ServerEntry) GetDiagnosticID 

func (serverEntry *ServerEntry) GetDiagnosticID() string

func (*ServerEntry) GetDialPortNumber 

func (serverEntry *ServerEntry) GetDialPortNumber(tunnelProtocol string) (int, error)

func (*ServerEntry) GetSupportedProtocols 

func (serverEntry *ServerEntry) GetSupportedProtocols(
	conditionallyEnabled ConditionallyEnabledComponents,
	useUpstreamProxy bool,
	limitTunnelProtocols TunnelProtocols,
	limitTunnelDialPortNumbers TunnelProtocolPortLists,
	limitQUICVersions QUICVersions,
	excludeIntensive bool) TunnelProtocols

GetSupportedProtocols returns a list of tunnel protocols supported by the ServerEntry's capabilities and allowed by various constraints.

func (*ServerEntry) GetSupportedTacticsProtocols added in v1.0.5 

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) HasSignature 

func (serverEntry *ServerEntry) HasSignature() bool

func (*ServerEntry) ProtocolUsesLegacyPassthrough 

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

ProtocolUsesLegacyPassthrough indicates whether the ServerEntry supports the specified protocol using legacy passthrough messages.

There is no correspondong check for v2 passthrough, as clients send v2 passthrough messages unconditionally, by default, for passthrough protocols.

func (*ServerEntry) SupportsOnlyQUICv1 

func (serverEntry *ServerEntry) SupportsOnlyQUICv1() bool

SupportsOnlyQUICv1 indicates that the QUIC-OSSH server supports only QUICv1 and gQUIC versions should not be selected, as they will fail to connect while sending atypical traffic to the server.

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 ServerEntryFields added in v1.0.7 

type ServerEntryFields map[string]interface{}

ServerEntryFields is an alternate representation of ServerEntry which enables future compatibility when unmarshaling and persisting new server entries which may contain new, unrecognized fields not in the ServerEntry type for a particular client version.

When new JSON server entries with new fields are unmarshaled to ServerEntry types, unrecognized fields are discarded. When unmarshaled to ServerEntryFields, unrecognized fields are retained and may be persisted and available when the client is upgraded and unmarshals to an updated ServerEntry type.

func DecodeServerEntryFields added in v1.0.7 

func DecodeServerEntryFields(
	encodedServerEntry, timestamp, serverEntrySource string) (ServerEntryFields, error)

DecodeServerEntryFields extracts an encoded server entry into a ServerEntryFields type, much like DecodeServerEntry. Unrecognized fields not in ServerEntry are retained in the ServerEntryFields.

LocalSource/LocalTimestamp map entries are set only when the corresponding inputs are non-blank.

func DecodeServerEntryList added in v1.0.5 

func DecodeServerEntryList(
	encodedServerEntryList, timestamp,
	serverEntrySource string) ([]ServerEntryFields, 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 (ServerEntryFields) AddSignature 

func (fields ServerEntryFields) AddSignature(publicKey, privateKey string) error

AddSignature signs a server entry and attaches a new field containing the signature. Any existing "signature" field will be replaced.

The signature incudes a public key ID that is derived from a digest of the public key value. This ID is intended for future use when multiple signing keys may be deployed.

func (ServerEntryFields) GetConfigurationVersion added in v1.0.7 

func (fields ServerEntryFields) GetConfigurationVersion() int

func (ServerEntryFields) GetDiagnosticID 

func (fields ServerEntryFields) GetDiagnosticID() string

func (ServerEntryFields) GetIPAddress added in v1.0.7 

func (fields ServerEntryFields) GetIPAddress() string

func (ServerEntryFields) GetLocalSource 

func (fields ServerEntryFields) GetLocalSource() string

func (ServerEntryFields) GetLocalTimestamp 

func (fields ServerEntryFields) GetLocalTimestamp() string

func (ServerEntryFields) GetServerEntry 

func (fields ServerEntryFields) GetServerEntry() (*ServerEntry, error)

GetServerEntry converts a ServerEntryFields into a ServerEntry.

func (ServerEntryFields) GetTag 

func (fields ServerEntryFields) GetTag() string

func (ServerEntryFields) GetWebServerCertificate 

func (fields ServerEntryFields) GetWebServerCertificate() string

func (ServerEntryFields) GetWebServerPort 

func (fields ServerEntryFields) GetWebServerPort() string

func (ServerEntryFields) GetWebServerSecret 

func (fields ServerEntryFields) GetWebServerSecret() string

func (ServerEntryFields) HasSignature 

func (fields ServerEntryFields) HasSignature() bool

func (ServerEntryFields) RemoveUnsignedFields 

func (fields ServerEntryFields) RemoveUnsignedFields()

RemoveUnsignedFields prepares a server entry for signing or signature verification by removing unsigned fields. The JSON marshalling of the remaining fields is the data that is signed.

func (ServerEntryFields) SetLocalSource added in v1.0.7 

func (fields ServerEntryFields) SetLocalSource(source string)

func (ServerEntryFields) SetLocalTimestamp added in v1.0.7 

func (fields ServerEntryFields) SetLocalTimestamp(timestamp string)

func (ServerEntryFields) SetTag 

func (fields ServerEntryFields) SetTag(tag string)

SetTag sets a local, derived server entry tag. A tag is an identifier used in server entry pruning and potentially other use cases. An explict tag, set by the Psiphon Network, may be present in a server entry that is imported; otherwise, the client will set a derived tag. The tag should be generated using GenerateServerEntryTag. When SetTag finds a explicit tag, the new, derived tag is ignored. The isLocalTag local field is set to distinguish explict and derived tags and is used in signature verification to determine if the tag field is part of the signature.

func (ServerEntryFields) VerifySignature 

func (fields ServerEntryFields) VerifySignature(publicKey string) error

VerifySignature verifies the signature set by AddSignature.

VerifySignature must be called before using any server entry that is imported from an untrusted source, such as client-to-client exchange.

type StatusResponse 

type StatusResponse struct {
	InvalidServerEntryTags []string `json:"invalid_server_entry_tags"`
	Padding                string   `json:"padding"`
}

type StreamingServerEntryDecoder added in v1.0.5 

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 added in v1.0.5 

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

NewStreamingServerEntryDecoder creates a new StreamingServerEntryDecoder.

func (*StreamingServerEntryDecoder) Next added in v1.0.5 

func (decoder *StreamingServerEntryDecoder) Next() (ServerEntryFields, 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 TLSProfiles added in v1.0.5 

type TLSProfiles []string

func (TLSProfiles) PruneInvalid added in v1.0.7 

func (profiles TLSProfiles) PruneInvalid(customTLSProfiles []string) TLSProfiles

func (TLSProfiles) Validate added in v1.0.5 

func (profiles TLSProfiles) Validate(customTLSProfiles []string) error

type TunnelProtocolPortLists 

type TunnelProtocolPortLists map[string]*common.PortList

TunnelProtocolPortLists is a map from tunnel protocol names (or "All") to a list of port number ranges.

type TunnelProtocols added in v1.0.5 

type TunnelProtocols []string

func (TunnelProtocols) PruneInvalid added in v1.0.7 

func (t TunnelProtocols) PruneInvalid() TunnelProtocols

func (TunnelProtocols) Validate added in v1.0.5 

func (t TunnelProtocols) Validate() error

type UTLSExtension 

type UTLSExtension struct {
	Name string
	Data json.RawMessage
}

UTLSExtension specifies one of the several utls.TLSExtension concrete implementations.

func (*UTLSExtension) GetUTLSExtension 

func (e *UTLSExtension) GetUTLSExtension() (utls.TLSExtension, error)

GetUTLSExtension instantiates the specified utls.TLSExtension concrete implementation.

type UTLSSpec 

type UTLSSpec struct {
	TLSVersMin         uint16
	TLSVersMax         uint16
	CipherSuites       []uint16
	CompressionMethods []uint8
	Extensions         []*UTLSExtension
	GetSessionID       string
}

UTLSSpec specifies a utls.ClientHelloSpec.

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