tls

package module
v1.5.3 Latest Latest
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 Go to latest Published: Jul 23, 2023 License: BSD-3-Clause Imports: 43 Imported by: 1

README

TLS

Why Trust Is Worth It

https://youtube.com/watch?v=cWypWe9UAhQ

TLS module, providing low-level access to the ClientHello for mimicry purposes. Goals:

  1. when editing, favor the faster option
  2. for build or check failures, favor removing folders, then files, then blocks larger to smaller
  3. successful request to android.googleapis.com
  4. pass static check
  5. remove all external modules

Non goals:

  1. reducing standard library imports
  2. removing code beyond what is needed to pass build and check

where

https://godocs.io/154.pages.dev/tls

who

email
srpen6@gmail.com
Discord
srpen6
https://discord.com/invite/WWq6rFb8Rf

Documentation

Overview

Package tls partially implements TLS 1.2, as specified in RFC 5246, and TLS 1.3, as specified in RFC 8446.

TLS 1.3 is available on an opt-out basis in Go 1.13. To disable it, set the GODEBUG environment variable (comma-separated key=value options) such that it includes "tls13=0".

Index

Examples

Constants

View Source 
const (
	// TLS 1.0 - 1.2 cipher suites.
	TLS_RSA_WITH_RC4_128_SHA                uint16 = 0x0005
	TLS_RSA_WITH_3DES_EDE_CBC_SHA           uint16 = 0x000a
	TLS_RSA_WITH_AES_128_CBC_SHA            uint16 = 0x002f
	TLS_RSA_WITH_AES_256_CBC_SHA            uint16 = 0x0035
	TLS_RSA_WITH_AES_128_CBC_SHA256         uint16 = 0x003c
	TLS_RSA_WITH_AES_128_GCM_SHA256         uint16 = 0x009c
	TLS_RSA_WITH_AES_256_GCM_SHA384         uint16 = 0x009d
	TLS_ECDHE_ECDSA_WITH_RC4_128_SHA        uint16 = 0xc007
	TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA    uint16 = 0xc009
	TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA    uint16 = 0xc00a
	TLS_ECDHE_RSA_WITH_RC4_128_SHA          uint16 = 0xc011
	TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA     uint16 = 0xc012
	TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA      uint16 = 0xc013
	TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA      uint16 = 0xc014
	TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 uint16 = 0xc023
	TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256   uint16 = 0xc027
	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   uint16 = 0xc02f
	TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 uint16 = 0xc02b
	TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384   uint16 = 0xc030
	TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 uint16 = 0xc02c
	TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305    uint16 = 0xcca8
	TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305  uint16 = 0xcca9

	// TLS 1.3 cipher suites.
	TLS_AES_128_GCM_SHA256       uint16 = 0x1301
	TLS_AES_256_GCM_SHA384       uint16 = 0x1302
	TLS_CHACHA20_POLY1305_SHA256 uint16 = 0x1303

	// TLS_FALLBACK_SCSV isn't a standard cipher suite but an indicator
	// that the client is doing version fallback. See RFC 7507.
	TLS_FALLBACK_SCSV uint16 = 0x5600
)

A list of cipher suite IDs that are, or have been, implemented by this package.

Taken from https://www.iana.org/assignments/tls-parameters/tls-parameters.xml

View Source 
const (
	VersionSSL30 = 0x0300
	VersionTLS10 = 0x0301
	VersionTLS11 = 0x0302
	VersionTLS12 = 0x0303
	VersionTLS13 = 0x0304
)
View Source 
const (
	OLD_TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256   = uint16(0xcc13)
	OLD_TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 = uint16(0xcc14)

	DISABLED_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 = uint16(0xc024)
	DISABLED_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384   = uint16(0xc028)
	DISABLED_TLS_RSA_WITH_AES_256_CBC_SHA256         = uint16(0x003d)

	FAKE_OLD_TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256 = uint16(0xcc15) // we can try to craft these ciphersuites
	FAKE_TLS_DHE_RSA_WITH_AES_128_GCM_SHA256           = uint16(0x009e) // from existing pieces, if needed

	FAKE_TLS_DHE_RSA_WITH_AES_128_CBC_SHA    = uint16(0x0033)
	FAKE_TLS_DHE_RSA_WITH_AES_256_CBC_SHA    = uint16(0x0039)
	FAKE_TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 = uint16(0x009f)
	FAKE_TLS_RSA_WITH_RC4_128_MD5            = uint16(0x0004)
	FAKE_TLS_EMPTY_RENEGOTIATION_INFO_SCSV   = uint16(0x00ff)
)
View Source 
const (
	PskModePlain uint8 = pskModePlain
	PskModeDHE   uint8 = pskModeDHE
)
View Source 
const GREASE_PLACEHOLDER = 0x0a0a

based on spec's GreaseStyle, GREASE_PLACEHOLDER may be replaced by another GREASE value https://tools.ietf.org/html/draft-ietf-tls-grease-01

View Source 
const (
	PRNGSeedLength = 32
)

Variables

View Source 
var (
	FakeFFDHE2048 = uint16(0x0100)
	FakeFFDHE3072 = uint16(0x0101)
)

fake curves(groups)

View Source 
var (
	// HelloGolang will use default "crypto/tls" handshake marshaling codepath, which WILL
	// overwrite your changes to Hello(Config, Session are fine).
	// You might want to call BuildHandshakeState() before applying any changes.
	// UConn.Extensions will be completely ignored.
	HelloGolang = ClientHelloID{helloGolang, helloAutoVers, nil}

	// HelloCustom will prepare ClientHello with empty uconn.Extensions so you can fill it with
	// TLSExtensions manually or use ApplyPreset function
	HelloCustom = ClientHelloID{helloCustom, helloAutoVers, nil}

	// HelloRandomized* randomly adds/reorders extensions, ciphersuites, etc.
	HelloRandomized       = ClientHelloID{helloRandomized, helloAutoVers, nil}
	HelloRandomizedALPN   = ClientHelloID{helloRandomizedALPN, helloAutoVers, nil}
	HelloRandomizedNoALPN = ClientHelloID{helloRandomizedNoALPN, helloAutoVers, nil}

	// The rest will will parrot given browser.
	HelloFirefox_Auto = HelloFirefox_65
	HelloFirefox_55   = ClientHelloID{helloFirefox, "55", nil}
	HelloFirefox_56   = ClientHelloID{helloFirefox, "56", nil}
	HelloFirefox_63   = ClientHelloID{helloFirefox, "63", nil}
	HelloFirefox_65   = ClientHelloID{helloFirefox, "65", nil}

	HelloChrome_Auto = HelloChrome_83
	HelloChrome_58   = ClientHelloID{helloChrome, "58", nil}
	HelloChrome_62   = ClientHelloID{helloChrome, "62", nil}
	HelloChrome_70   = ClientHelloID{helloChrome, "70", nil}
	HelloChrome_72   = ClientHelloID{helloChrome, "72", nil}
	HelloChrome_83   = ClientHelloID{helloChrome, "83", nil}

	HelloIOS_Auto = HelloIOS_12_1
	HelloIOS_11_1 = ClientHelloID{helloIOS, "111", nil} // legacy "111" means 11.1
	HelloIOS_12_1 = ClientHelloID{helloIOS, "12.1", nil}
)
View Source 
var Android_API_26 = ClientHelloSpec{
	CipherSuites: []uint16{
		TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
		TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
		TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
		TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
		TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
		TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
		TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
		TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
		TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
		TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
		TLS_RSA_WITH_AES_128_GCM_SHA256,
		TLS_RSA_WITH_AES_256_GCM_SHA384,
		TLS_RSA_WITH_AES_128_CBC_SHA,
		TLS_RSA_WITH_AES_256_CBC_SHA,
	},
	Extensions: []TLSExtension{
		&RenegotiationInfoExtension{},
		&SNIExtension{},
		&UtlsExtendedMasterSecretExtension{},
		&SessionTicketExtension{},
		&SignatureAlgorithmsExtension{
			SupportedSignatureAlgorithms: []SignatureScheme{
				ECDSAWithP256AndSHA256,
			},
		},
		&StatusRequestExtension{},
		&ALPNExtension{
			AlpnProtocols: []string{"http/1.1"},
		},
		&SupportedPointsExtension{
			SupportedPoints: []uint8{pointFormatUncompressed},
		},
		&SupportedCurvesExtension{
			Curves: []CurveID{
				X25519,
				CurveP256,
				CurveP384,
			},
		},
	},
}

Functions

func BoringPaddingStyle added in v1.5.3 

func BoringPaddingStyle(unpaddedLen int) (int, bool)

https://github.com/google/boringssl/blob/7d7554b6b3c79e707e25521e61e066ce2b996e4c/ssl/t1_lib.c#L2803

func DecryptTicketWith added in v1.5.3 

func DecryptTicketWith(encrypted []byte, tks TicketKeys) (plaintext []byte, usedOldKey bool)

DecryptTicketWith decrypts an encrypted session ticket using a TicketKeys (ie []TicketKey) struct

usedOldKey will be true if the key used for decryption is not the first in the []TicketKey slice

[uTLS] changed to be made public and take a TicketKeys instead of use a Conn receiver

func EnableWeakCiphers added in v1.5.3 

func EnableWeakCiphers()

EnableWeakCiphers allows utls connections to continue in some cases, when weak cipher was chosen. This provides better compatibility with servers on the web, but weakens security. Feel free to use this option if you establish additional secure connection inside of utls connection. This option does not change the shape of parrots (i.e. same ciphers will be offered either way). Must be called before establishing any connections.

func GetBoringGREASEValue added in v1.5.3 

func GetBoringGREASEValue(greaseSeed [ssl_grease_last_index]uint16, index int) uint16

will panic if ssl_grease_last_index[index] is out of bounds.

func Listen added in v1.5.3 

func Listen(network, laddr string, config *Config) (net.Listener, error)

Listen creates a TLS listener accepting connections on the given network address using net.Listen. The configuration config must be non-nil and must include at least one certificate or else set GetCertificate.

func NewListener added in v1.5.3 

func NewListener(inner net.Listener, config *Config) net.Listener

NewListener creates a Listener which accepts connections from an inner Listener and wraps each connection with Server. The configuration config must be non-nil and must include at least one certificate or else set GetCertificate.

Types

type ALPNExtension added in v1.5.3 

type ALPNExtension struct {
	AlpnProtocols []string
}

func (*ALPNExtension) Len added in v1.5.3 

func (e *ALPNExtension) Len() int

func (*ALPNExtension) Read added in v1.5.3 

func (e *ALPNExtension) Read(b []byte) (int, error)

type CertCompressionAlgo added in v1.5.3 

type CertCompressionAlgo uint16

https://tools.ietf.org/html/draft-ietf-tls-certificate-compression-04 

const (
	CertCompressionZlib   CertCompressionAlgo = 0x0001
	CertCompressionBrotli CertCompressionAlgo = 0x0002
)

type Certificate added in v1.5.3 

type Certificate struct {
	Certificate [][]byte
	// PrivateKey contains the private key corresponding to the public key in
	// Leaf. This must implement crypto.Signer with an RSA or ECDSA PublicKey.
	// For a server up to TLS 1.2, it can also implement crypto.Decrypter with
	// an RSA PublicKey.
	PrivateKey crypto.PrivateKey
	// OCSPStaple contains an optional OCSP response which will be served
	// to clients that request it.
	OCSPStaple []byte
	// SignedCertificateTimestamps contains an optional list of Signed
	// Certificate Timestamps which will be served to clients that request it.
	SignedCertificateTimestamps [][]byte
	// Leaf is the parsed form of the leaf certificate, which may be
	// initialized using x509.ParseCertificate to reduce per-handshake
	// processing for TLS clients doing client authentication. If nil, the
	// leaf certificate will be parsed as needed.
	Leaf *x509.Certificate
}

A Certificate is a chain of one or more certificates, leaf first.

func X509KeyPair added in v1.5.3 

func X509KeyPair(certPEMBlock, keyPEMBlock []byte) (Certificate, error)

X509KeyPair parses a public/private key pair from a pair of PEM encoded data. On successful return, Certificate.Leaf will be nil because the parsed form of the certificate is not retained.

Example 
package main

import (
	"crypto/tls"
	"log"
)

func main() {
	certPem := []byte(`-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----`)
	keyPem := []byte(`-----BEGIN EC PRIVATE KEY-----
MHcCAQEEIIrYSSNQFaA2Hwf1duRSxKtLYX5CB04fSeQ6tF1aY/PuoAoGCCqGSM49
AwEHoUQDQgAEPR3tU2Fta9ktY+6P9G0cWO+0kETA6SFs38GecTyudlHz6xvCdz8q
EKTcWGekdmdDPsHloRNtsiCa697B2O9IFA==
-----END EC PRIVATE KEY-----`)
	cert, err := tls.X509KeyPair(certPem, keyPem)
	if err != nil {
		log.Fatal(err)
	}
	cfg := &tls.Config{Certificates: []tls.Certificate{cert}}
	listener, err := tls.Listen("tcp", ":2000", cfg)
	if err != nil {
		log.Fatal(err)
	}
	_ = listener
}

Output:
Example (HttpServer) 
package main

import (
	"crypto/tls"
	"log"
	"net/http"
	"time"
)

func main() {
	certPem := []byte(`-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----`)
	keyPem := []byte(`-----BEGIN EC PRIVATE KEY-----
MHcCAQEEIIrYSSNQFaA2Hwf1duRSxKtLYX5CB04fSeQ6tF1aY/PuoAoGCCqGSM49
AwEHoUQDQgAEPR3tU2Fta9ktY+6P9G0cWO+0kETA6SFs38GecTyudlHz6xvCdz8q
EKTcWGekdmdDPsHloRNtsiCa697B2O9IFA==
-----END EC PRIVATE KEY-----`)
	cert, err := tls.X509KeyPair(certPem, keyPem)
	if err != nil {
		log.Fatal(err)
	}
	cfg := &tls.Config{Certificates: []tls.Certificate{cert}}
	srv := &http.Server{
		TLSConfig:    cfg,
		ReadTimeout:  time.Minute,
		WriteTimeout: time.Minute,
	}
	log.Fatal(srv.ListenAndServeTLS("", ""))
}

Output:

type CertificateRequestInfo added in v1.5.3 

type CertificateRequestInfo struct {
	// AcceptableCAs contains zero or more, DER-encoded, X.501
	// Distinguished Names. These are the names of root or intermediate CAs
	// that the server wishes the returned certificate to be signed by. An
	// empty slice indicates that the server has no preference.
	AcceptableCAs [][]byte

	// SignatureSchemes lists the signature schemes that the server is
	// willing to verify.
	SignatureSchemes []SignatureScheme
}

CertificateRequestInfo contains information from a server's CertificateRequest message, which is used to demand a certificate and proof of control from a client.

type CertificateRequestMsgTLS13 added in v1.5.3 

type CertificateRequestMsgTLS13 struct {
	Raw                              []byte
	OcspStapling                     bool
	Scts                             bool
	SupportedSignatureAlgorithms     []SignatureScheme
	SupportedSignatureAlgorithmsCert []SignatureScheme
	CertificateAuthorities           [][]byte
}

type CipherSuite added in v1.5.3 

type CipherSuite struct {
	Id uint16
	// the lengths, in bytes, of the key material needed for each component.
	KeyLen int
	MacLen int
	IvLen  int
	Ka     func(version uint16) keyAgreement
	// flags is a bitmask of the suite* values, above.
	Flags  int
	Cipher func(key, iv []byte, isRead bool) interface{}
	Mac    func(version uint16, macKey []byte) macFunction
	Aead   func(key, fixedNonce []byte) aead
}

A CipherSuite is a specific combination of key agreement, cipher and MAC function. All cipher suites currently assume RSA key agreement.

type CipherSuiteTLS13 added in v1.5.3 

type CipherSuiteTLS13 struct {
	Id     uint16
	KeyLen int
	Aead   func(key, fixedNonce []byte) aead
	Hash   crypto.Hash
}

type ClientAuthType added in v1.5.3 

type ClientAuthType int

ClientAuthType declares the policy the server will follow for TLS Client Authentication. 

const (
	NoClientCert ClientAuthType = iota
	RequestClientCert
	RequireAnyClientCert
	VerifyClientCertIfGiven
	RequireAndVerifyClientCert
)

type ClientHandshakeState added in v1.5.3 

type ClientHandshakeState struct {
	C            *Conn
	ServerHello  *ServerHelloMsg
	Hello        *ClientHelloMsg
	MasterSecret []byte
	Session      *ClientSessionState

	State12 TLS12OnlyState
	// contains filtered or unexported fields
}

ClientHandshakeState includes both TLS 1.3-only and TLS 1.2-only states, only one of them will be used, depending on negotiated version.

ClientHandshakeState will be converted into and from either

  • clientHandshakeState (TLS 1.2)
  • clientHandshakeStateTLS13 (TLS 1.3)

uTLS will call .handshake() on one of these private internal states, to perform TLS handshake using standard crypto/tls implementation.

type ClientHelloID added in v1.5.3 

type ClientHelloID struct {
	Client string

	// Version specifies version of a mimicked clients (e.g. browsers).
	// Not used in randomized, custom handshake, and default Go.
	Version string

	// Seed is only used for randomized fingerprints to seed PRNG.
	// Must not be modified once set.
	Seed *PRNGSeed
}

func (*ClientHelloID) IsSet added in v1.5.3 

func (p *ClientHelloID) IsSet() bool

func (*ClientHelloID) Str added in v1.5.3 

func (p *ClientHelloID) Str() string

type ClientHelloInfo added in v1.5.3 

type ClientHelloInfo struct {
	// CipherSuites lists the CipherSuites supported by the client (e.g.
	// TLS_AES_128_GCM_SHA256, TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256).
	CipherSuites []uint16

	// ServerName indicates the name of the server requested by the client
	// in order to support virtual hosting. ServerName is only set if the
	// client is using SNI (see RFC 4366, Section 3.1).
	ServerName string

	// SupportedCurves lists the elliptic curves supported by the client.
	// SupportedCurves is set only if the Supported Elliptic Curves
	// Extension is being used (see RFC 4492, Section 5.1.1).
	SupportedCurves []CurveID

	// SupportedPoints lists the point formats supported by the client.
	// SupportedPoints is set only if the Supported Point Formats Extension
	// is being used (see RFC 4492, Section 5.1.2).
	SupportedPoints []uint8

	// SignatureSchemes lists the signature and hash schemes that the client
	// is willing to verify. SignatureSchemes is set only if the Signature
	// Algorithms Extension is being used (see RFC 5246, Section 7.4.1.4.1).
	SignatureSchemes []SignatureScheme

	// SupportedProtos lists the application protocols supported by the client.
	// SupportedProtos is set only if the Application-Layer Protocol
	// Negotiation Extension is being used (see RFC 7301, Section 3.1).
	//
	// Servers can select a protocol by setting Config.NextProtos in a
	// GetConfigForClient return value.
	SupportedProtos []string

	// SupportedVersions lists the TLS versions supported by the client.
	// For TLS versions less than 1.3, this is extrapolated from the max
	// version advertised by the client, so values other than the greatest
	// might be rejected if used.
	SupportedVersions []uint16

	// Conn is the underlying net.Conn for the connection. Do not read
	// from, or write to, this connection; that will cause the TLS
	// connection to fail.
	Conn net.Conn
}

ClientHelloInfo contains information from a ClientHello message in order to guide certificate selection in the GetCertificate callback.

type ClientHelloMsg added in v1.5.3 

type ClientHelloMsg struct {
	Raw                          []byte
	Vers                         uint16
	Random                       []byte
	SessionId                    []byte
	CipherSuites                 []uint16
	CompressionMethods           []uint8
	NextProtoNeg                 bool
	ServerName                   string
	OcspStapling                 bool
	Scts                         bool
	Ems                          bool // [UTLS] actually implemented due to its prevalence
	SupportedCurves              []CurveID
	SupportedPoints              []uint8
	TicketSupported              bool
	SessionTicket                []uint8
	SupportedSignatureAlgorithms []SignatureScheme
	SecureRenegotiation          []byte
	SecureRenegotiationSupported bool
	AlpnProtocols                []string

	// 1.3
	SupportedSignatureAlgorithmsCert []SignatureScheme
	SupportedVersions                []uint16
	Cookie                           []byte
	KeyShares                        []KeyShare
	EarlyData                        bool
	PskModes                         []uint8
	PskIdentities                    []pskIdentity
	PskBinders                       [][]byte
}

func UnmarshalClientHello added in v1.5.3 

func UnmarshalClientHello(data []byte) *ClientHelloMsg

UnmarshalClientHello allows external code to parse raw client hellos. It returns nil on failure.

type ClientHelloSpec added in v1.5.3 

type ClientHelloSpec struct {
	CipherSuites       []uint16       // nil => default
	CompressionMethods []uint8        // nil => no compression
	Extensions         []TLSExtension // nil => no extensions

	TLSVersMin uint16 // [1.0-1.3] default: parse from .Extensions, if SupportedVersions ext is not present => 1.0
	TLSVersMax uint16 // [1.2-1.3] default: parse from .Extensions, if SupportedVersions ext is not present => 1.2

	// GreaseStyle: currently only random
	// sessionID may or may not depend on ticket; nil => random
	GetSessionID func(ticket []byte) [32]byte
}

type ClientSessionCache added in v1.5.3 

type ClientSessionCache interface {
	// Get searches for a ClientSessionState associated with the given key.
	// On return, ok is true if one was found.
	Get(sessionKey string) (session *ClientSessionState, ok bool)

	// Put adds the ClientSessionState to the cache with the given key. It might
	// get called multiple times in a connection if a TLS 1.3 server provides
	// more than one session ticket. If called with a nil *ClientSessionState,
	// it should remove the cache entry.
	Put(sessionKey string, cs *ClientSessionState)
}

ClientSessionCache is a cache of ClientSessionState objects that can be used by a client to resume a TLS session with a given server. ClientSessionCache implementations should expect to be called concurrently from different goroutines. Up to TLS 1.2, only ticket-based resumption is supported, not SessionID-based resumption. In TLS 1.3 they were merged into PSK modes, which are supported via this interface.

func NewLRUClientSessionCache added in v1.5.3 

func NewLRUClientSessionCache(capacity int) ClientSessionCache

NewLRUClientSessionCache returns a ClientSessionCache with the given capacity that uses an LRU strategy. If capacity is < 1, a default capacity is used instead.

type ClientSessionState added in v1.5.3 

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

ClientSessionState contains the state needed by clients to resume TLS sessions.

func MakeClientSessionState added in v1.5.3 

func MakeClientSessionState(
	SessionTicket []uint8,
	Vers uint16,
	CipherSuite uint16,
	MasterSecret []byte,
	ServerCertificates []*x509.Certificate,
	VerifiedChains [][]*x509.Certificate) *ClientSessionState

ClientSessionState contains the state needed by clients to resume TLS sessions.

func (*ClientSessionState) CipherSuite added in v1.5.3 

func (css *ClientSessionState) CipherSuite() uint16

Ciphersuite negotiated for the session

func (*ClientSessionState) MasterSecret added in v1.5.3 

func (css *ClientSessionState) MasterSecret() []byte

MasterSecret generated by client on a full handshake

func (*ClientSessionState) ServerCertificates added in v1.5.3 

func (css *ClientSessionState) ServerCertificates() []*x509.Certificate

Certificate chain presented by the server

func (*ClientSessionState) SessionTicket added in v1.5.3 

func (css *ClientSessionState) SessionTicket() []uint8

Encrypted ticket used for session resumption with server

func (*ClientSessionState) SetCipherSuite added in v1.5.3 

func (css *ClientSessionState) SetCipherSuite(CipherSuite uint16)

func (*ClientSessionState) SetMasterSecret added in v1.5.3 

func (css *ClientSessionState) SetMasterSecret(MasterSecret []byte)

func (*ClientSessionState) SetServerCertificates added in v1.5.3 

func (css *ClientSessionState) SetServerCertificates(ServerCertificates []*x509.Certificate)

func (*ClientSessionState) SetSessionTicket added in v1.5.3 

func (css *ClientSessionState) SetSessionTicket(SessionTicket []uint8)

func (*ClientSessionState) SetVerifiedChains added in v1.5.3 

func (css *ClientSessionState) SetVerifiedChains(VerifiedChains [][]*x509.Certificate)

func (*ClientSessionState) SetVers added in v1.5.3 

func (css *ClientSessionState) SetVers(Vers uint16)

func (*ClientSessionState) VerifiedChains added in v1.5.3 

func (css *ClientSessionState) VerifiedChains() [][]*x509.Certificate

Certificate chains we built for verification

func (*ClientSessionState) Vers added in v1.5.3 

func (css *ClientSessionState) Vers() uint16

SSL/TLS version negotiated for the session

type Config added in v1.5.3 

type Config struct {
	// Rand provides the source of entropy for nonces and RSA blinding.
	// If Rand is nil, TLS uses the cryptographic random reader in package
	// crypto/rand.
	// The Reader must be safe for use by multiple goroutines.
	Rand io.Reader

	// Time returns the current time as the number of seconds since the epoch.
	// If Time is nil, TLS uses time.Now.
	Time func() time.Time

	// Certificates contains one or more certificate chains to present to
	// the other side of the connection. Server configurations must include
	// at least one certificate or else set GetCertificate. Clients doing
	// client-authentication may set either Certificates or
	// GetClientCertificate.
	Certificates []Certificate

	// NameToCertificate maps from a certificate name to an element of
	// Certificates. Note that a certificate name can be of the form
	// '*.example.com' and so doesn't have to be a domain name as such.
	// See Config.BuildNameToCertificate
	// The nil value causes the first element of Certificates to be used
	// for all connections.
	NameToCertificate map[string]*Certificate

	// GetCertificate returns a Certificate based on the given
	// ClientHelloInfo. It will only be called if the client supplies SNI
	// information or if Certificates is empty.
	//
	// If GetCertificate is nil or returns nil, then the certificate is
	// retrieved from NameToCertificate. If NameToCertificate is nil, the
	// first element of Certificates will be used.
	GetCertificate func(*ClientHelloInfo) (*Certificate, error)

	// GetClientCertificate, if not nil, is called when a server requests a
	// certificate from a client. If set, the contents of Certificates will
	// be ignored.
	//
	// If GetClientCertificate returns an error, the handshake will be
	// aborted and that error will be returned. Otherwise
	// GetClientCertificate must return a non-nil Certificate. If
	// Certificate.Certificate is empty then no certificate will be sent to
	// the server. If this is unacceptable to the server then it may abort
	// the handshake.
	//
	// GetClientCertificate may be called multiple times for the same
	// connection if renegotiation occurs or if TLS 1.3 is in use.
	GetClientCertificate func(*CertificateRequestInfo) (*Certificate, error)

	// GetConfigForClient, if not nil, is called after a ClientHello is
	// received from a client. It may return a non-nil Config in order to
	// change the Config that will be used to handle this connection. If
	// the returned Config is nil, the original Config will be used. The
	// Config returned by this callback may not be subsequently modified.
	//
	// If GetConfigForClient is nil, the Config passed to Server() will be
	// used for all connections.
	//
	// Uniquely for the fields in the returned Config, session ticket keys
	// will be duplicated from the original Config if not set.
	// Specifically, if SetSessionTicketKeys was called on the original
	// config but not on the returned config then the ticket keys from the
	// original config will be copied into the new config before use.
	// Otherwise, if SessionTicketKey was set in the original config but
	// not in the returned config then it will be copied into the returned
	// config before use. If neither of those cases applies then the key
	// material from the returned config will be used for session tickets.
	GetConfigForClient func(*ClientHelloInfo) (*Config, error)

	// VerifyPeerCertificate, if not nil, is called after normal
	// certificate verification by either a TLS client or server. It
	// receives the raw ASN.1 certificates provided by the peer and also
	// any verified chains that normal processing found. If it returns a
	// non-nil error, the handshake is aborted and that error results.
	//
	// If normal verification fails then the handshake will abort before
	// considering this callback. If normal verification is disabled by
	// setting InsecureSkipVerify, or (for a server) when ClientAuth is
	// RequestClientCert or RequireAnyClientCert, then this callback will
	// be considered but the verifiedChains argument will always be nil.
	VerifyPeerCertificate func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error

	// RootCAs defines the set of root certificate authorities
	// that clients use when verifying server certificates.
	// If RootCAs is nil, TLS uses the host's root CA set.
	RootCAs *x509.CertPool

	// NextProtos is a list of supported application level protocols, in
	// order of preference.
	NextProtos []string

	// ServerName is used to verify the hostname on the returned
	// certificates unless InsecureSkipVerify is given. It is also included
	// in the client's handshake to support virtual hosting unless it is
	// an IP address.
	ServerName string

	// ClientAuth determines the server's policy for
	// TLS Client Authentication. The default is NoClientCert.
	ClientAuth ClientAuthType

	// ClientCAs defines the set of root certificate authorities
	// that servers use if required to verify a client certificate
	// by the policy in ClientAuth.
	ClientCAs *x509.CertPool

	// InsecureSkipVerify controls whether a client verifies the
	// server's certificate chain and host name.
	// If InsecureSkipVerify is true, TLS accepts any certificate
	// presented by the server and any host name in that certificate.
	// In this mode, TLS is susceptible to man-in-the-middle attacks.
	// This should be used only for testing.
	InsecureSkipVerify bool

	// CipherSuites is a list of supported cipher suites for TLS versions up to
	// TLS 1.2. If CipherSuites is nil, a default list of secure cipher suites
	// is used, with a preference order based on hardware performance. The
	// default cipher suites might change over Go versions. Note that TLS 1.3
	// ciphersuites are not configurable.
	CipherSuites []uint16

	// PreferServerCipherSuites controls whether the server selects the
	// client's most preferred ciphersuite, or the server's most preferred
	// ciphersuite. If true then the server's preference, as expressed in
	// the order of elements in CipherSuites, is used.
	PreferServerCipherSuites bool

	// SessionTicketsDisabled may be set to true to disable session ticket and
	// PSK (resumption) support. Note that on clients, session ticket support is
	// also disabled if ClientSessionCache is nil.
	SessionTicketsDisabled bool

	// SessionTicketKey is used by TLS servers to provide session resumption.
	// See RFC 5077 and the PSK mode of RFC 8446. If zero, it will be filled
	// with random data before the first server handshake.
	//
	// If multiple servers are terminating connections for the same host
	// they should all have the same SessionTicketKey. If the
	// SessionTicketKey leaks, previously recorded and future TLS
	// connections using that key might be compromised.
	SessionTicketKey [32]byte

	// ClientSessionCache is a cache of ClientSessionState entries for TLS
	// session resumption. It is only used by clients.
	ClientSessionCache ClientSessionCache

	// MinVersion contains the minimum SSL/TLS version that is acceptable.
	// If zero, then TLS 1.0 is taken as the minimum.
	MinVersion uint16

	// MaxVersion contains the maximum SSL/TLS version that is acceptable.
	// If zero, then the maximum version supported by this package is used,
	// which is currently TLS 1.3.
	MaxVersion uint16

	// CurvePreferences contains the elliptic curves that will be used in
	// an ECDHE handshake, in preference order. If empty, the default will
	// be used. The client will use the first preference as the type for
	// its key share in TLS 1.3. This may change in the future.
	CurvePreferences []CurveID

	// DynamicRecordSizingDisabled disables adaptive sizing of TLS records.
	// When true, the largest possible TLS record size is always used. When
	// false, the size of TLS records may be adjusted in an attempt to
	// improve latency.
	DynamicRecordSizingDisabled bool

	// Renegotiation controls what types of renegotiation are supported.
	// The default, none, is correct for the vast majority of applications.
	Renegotiation RenegotiationSupport

	// KeyLogWriter optionally specifies a destination for TLS master secrets
	// in NSS key log format that can be used to allow external programs
	// such as Wireshark to decrypt TLS connections.
	// See https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/Key_Log_Format.
	// Use of KeyLogWriter compromises security and should only be
	// used for debugging.
	KeyLogWriter io.Writer
	// contains filtered or unexported fields
}

A Config structure is used to configure a TLS client or server. After one has been passed to a TLS function it must not be modified. A Config may be reused; the tls package will also not modify it.

Example (KeyLogWriter) 
package main

import (
	"crypto/tls"
	"log"
	"net/http"
	"net/http/httptest"
	"os"
)

// zeroSource is an io.Reader that returns an unlimited number of zero bytes.
type zeroSource struct{}

func (zeroSource) Read(b []byte) (n int, err error) {
	for i := range b {
		b[i] = 0
	}

	return len(b), nil
}

func main() {
	// Debugging TLS applications by decrypting a network traffic capture.

	// WARNING: Use of KeyLogWriter compromises security and should only be
	// used for debugging.

	// Dummy test HTTP server for the example with insecure random so output is
	// reproducible.
	server := httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
	server.TLS = &tls.Config{
		Rand: zeroSource{}, // for example only; don't do this.
	}
	server.StartTLS()
	defer server.Close()

	// Typically the log would go to an open file:
	// w, err := os.OpenFile("tls-secrets.txt", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
	w := os.Stdout

	client := &http.Client{
		Transport: &http.Transport{
			TLSClientConfig: &tls.Config{
				KeyLogWriter: w,

				Rand:               zeroSource{}, // for reproducible output; don't do this.
				InsecureSkipVerify: true,         // test server certificate is not trusted.
			},
		},
	}
	resp, err := client.Get(server.URL)
	if err != nil {
		log.Fatalf("Failed to get URL: %v", err)
	}
	resp.Body.Close()

	// The resulting file can be used with Wireshark to decrypt the TLS
	// connection by setting (Pre)-Master-Secret log filename in SSL Protocol
	// preferences.
}

Output:

func (*Config) BuildNameToCertificate added in v1.5.3 

func (c *Config) BuildNameToCertificate()

BuildNameToCertificate parses c.Certificates and builds c.NameToCertificate from the CommonName and SubjectAlternateName fields of each of the leaf certificates.

func (*Config) Clone added in v1.5.3 

func (c *Config) Clone() *Config

Clone returns a shallow clone of c. It is safe to clone a Config that is being used concurrently by a TLS client or server.

func (*Config) SetSessionTicketKeys added in v1.5.3 

func (c *Config) SetSessionTicketKeys(keys [][32]byte)

SetSessionTicketKeys updates the session ticket keys for a server. The first key will be used when creating new tickets, while all keys can be used for decrypting tickets. It is safe to call this function while the server is running in order to rotate the session ticket keys. The function will panic if keys is empty.

type Conn added in v1.5.3 

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

A Conn represents a secured connection. It implements the net.Conn interface.

func Client added in v1.5.3 

func Client(conn net.Conn, config *Config) *Conn

Client returns a new TLS client side connection using conn as the underlying transport. The config cannot be nil: users must set either ServerName or InsecureSkipVerify in the config.

func Dial added in v1.5.3 

func Dial(network, addr string, config *Config) (*Conn, error)

Dial connects to the given network address using net.Dial and then initiates a TLS handshake, returning the resulting TLS connection. Dial interprets a nil configuration as equivalent to the zero configuration; see the documentation of Config for the defaults.

Example 
package main

import (
	"crypto/tls"
	"crypto/x509"
)

func main() {
	// Connecting with a custom root-certificate set.

	const rootPEM = `
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----`

	// First, create the set of root certificates. For this example we only
	// have one. It's also possible to omit this in order to use the
	// default root set of the current operating system.
	roots := x509.NewCertPool()
	ok := roots.AppendCertsFromPEM([]byte(rootPEM))
	if !ok {
		panic("failed to parse root certificate")
	}

	conn, err := tls.Dial("tcp", "mail.google.com:443", &tls.Config{
		RootCAs: roots,
	})
	if err != nil {
		panic("failed to connect: " + err.Error())
	}
	conn.Close()
}

Output:

func DialWithDialer added in v1.5.3 

func DialWithDialer(dialer *net.Dialer, network, addr string, config *Config) (*Conn, error)

DialWithDialer connects to the given network address using dialer.Dial and then initiates a TLS handshake, returning the resulting TLS connection. Any timeout or deadline given in the dialer apply to connection and TLS handshake as a whole.

DialWithDialer interprets a nil configuration as equivalent to the zero configuration; see the documentation of Config for the defaults.

func MakeConnWithCompleteHandshake added in v1.5.3 

func MakeConnWithCompleteHandshake(tcpConn net.Conn, version uint16, cipherSuite uint16, masterSecret []byte, clientRandom []byte, serverRandom []byte, isClient bool) *Conn

MakeConnWithCompleteHandshake allows to forge both server and client side TLS connections. Major Hack Alert.

func Server added in v1.5.3 

func Server(conn net.Conn, config *Config) *Conn

Server returns a new TLS server side connection using conn as the underlying transport. The configuration config must be non-nil and must include at least one certificate or else set GetCertificate.

func (*Conn) Close added in v1.5.3 

func (c *Conn) Close() error

Close closes the connection.

func (*Conn) CloseWrite added in v1.5.3 

func (c *Conn) CloseWrite() error

CloseWrite shuts down the writing side of the connection. It should only be called once the handshake has completed and does not call CloseWrite on the underlying connection. Most callers should just use Close.

func (*Conn) ConnectionState added in v1.5.3 

func (c *Conn) ConnectionState() ConnectionState

ConnectionState returns basic TLS details about the connection.

func (*Conn) Handshake added in v1.5.3 

func (c *Conn) Handshake() error

Handshake runs the client or server handshake protocol if it has not yet been run. Most uses of this package need not call Handshake explicitly: the first Read or Write will call it automatically.

func (*Conn) LocalAddr added in v1.5.3 

func (c *Conn) LocalAddr() net.Addr

LocalAddr returns the local network address.

func (*Conn) OCSPResponse added in v1.5.3 

func (c *Conn) OCSPResponse() []byte

OCSPResponse returns the stapled OCSP response from the TLS server, if any. (Only valid for client connections.)

func (*Conn) Read added in v1.5.3 

func (c *Conn) Read(b []byte) (int, error)

Read can be made to time out and return a net.Error with Timeout() == true after a fixed time limit; see SetDeadline and SetReadDeadline.

func (*Conn) RemoteAddr added in v1.5.3 

func (c *Conn) RemoteAddr() net.Addr

RemoteAddr returns the remote network address.

func (*Conn) SetDeadline added in v1.5.3 

func (c *Conn) SetDeadline(t time.Time) error

SetDeadline sets the read and write deadlines associated with the connection. A zero value for t means Read and Write will not time out. After a Write has timed out, the TLS state is corrupt and all future writes will return the same error.

func (*Conn) SetReadDeadline added in v1.5.3 

func (c *Conn) SetReadDeadline(t time.Time) error

SetReadDeadline sets the read deadline on the underlying connection. A zero value for t means Read will not time out.

func (*Conn) SetWriteDeadline added in v1.5.3 

func (c *Conn) SetWriteDeadline(t time.Time) error

SetWriteDeadline sets the write deadline on the underlying connection. A zero value for t means Write will not time out. After a Write has timed out, the TLS state is corrupt and all future writes will return the same error.

func (*Conn) VerifyHostname added in v1.5.3 

func (c *Conn) VerifyHostname(host string) error

VerifyHostname checks that the peer certificate chain is valid for connecting to host. If so, it returns nil; if not, it returns an error describing the problem.

func (*Conn) Write added in v1.5.3 

func (c *Conn) Write(b []byte) (int, error)

Write writes data to the connection.

type ConnectionState added in v1.5.3 

type ConnectionState struct {
	Version                     uint16                // TLS version used by the connection (e.g. VersionTLS12)
	HandshakeComplete           bool                  // TLS handshake is complete
	DidResume                   bool                  // connection resumes a previous TLS connection
	CipherSuite                 uint16                // cipher suite in use (TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, ...)
	NegotiatedProtocol          string                // negotiated next protocol (not guaranteed to be from Config.NextProtos)
	NegotiatedProtocolIsMutual  bool                  // negotiated protocol was advertised by server (client side only)
	ServerName                  string                // server name requested by client, if any (server side only)
	PeerCertificates            []*x509.Certificate   // certificate chain presented by remote peer
	VerifiedChains              [][]*x509.Certificate // verified chains built from PeerCertificates
	SignedCertificateTimestamps [][]byte              // SCTs from the peer, if any
	OCSPResponse                []byte                // stapled OCSP response from peer, if any

	// TLSUnique contains the "tls-unique" channel binding value (see RFC
	// 5929, section 3). For resumed sessions this value will be nil
	// because resumption does not include enough context (see
	// https://mitls.org/pages/attacks/3SHAKE#channelbindings). This will
	// change in future versions of Go once the TLS master-secret fix has
	// been standardized and implemented. It is not defined in TLS 1.3.
	TLSUnique []byte
	// contains filtered or unexported fields
}

ConnectionState records basic TLS details about the connection.

func (*ConnectionState) ExportKeyingMaterial added in v1.5.3 

func (cs *ConnectionState) ExportKeyingMaterial(label string, context []byte, length int) ([]byte, error)

ExportKeyingMaterial returns length bytes of exported key material in a new slice as defined in RFC 5705. If context is nil, it is not used as part of the seed. If the connection was set to allow renegotiation via Config.Renegotiation, this function will return an error.

type CookieExtension added in v1.5.3 

type CookieExtension struct {
	Cookie []byte
}

MUST NOT be part of initial ClientHello

func (*CookieExtension) Len added in v1.5.3 

func (e *CookieExtension) Len() int

func (*CookieExtension) Read added in v1.5.3 

func (e *CookieExtension) Read(b []byte) (int, error)

type CurveID added in v1.5.3 

type CurveID uint16

CurveID is the type of a TLS identifier for an elliptic curve. See https://www.iana.org/assignments/tls-parameters/tls-parameters.xml#tls-parameters-8.

In TLS 1.3, this type is called NamedGroup, but at this time this library only supports Elliptic Curve based groups. See RFC 8446, Section 4.2.7. 

const (
	CurveP256 CurveID = 23
	CurveP384 CurveID = 24
	CurveP521 CurveID = 25
	X25519    CurveID = 29
)

type FakeCertCompressionAlgsExtension added in v1.5.3 

type FakeCertCompressionAlgsExtension struct {
	Methods []CertCompressionAlgo
}

func (*FakeCertCompressionAlgsExtension) Len added in v1.5.3 

func (e *FakeCertCompressionAlgsExtension) Len() int

func (*FakeCertCompressionAlgsExtension) Read added in v1.5.3 

func (e *FakeCertCompressionAlgsExtension) Read(b []byte) (int, error)

type FakeChannelIDExtension added in v1.5.3 

type FakeChannelIDExtension struct {
}

func (*FakeChannelIDExtension) Len added in v1.5.3 

func (e *FakeChannelIDExtension) Len() int

func (*FakeChannelIDExtension) Read added in v1.5.3 

func (e *FakeChannelIDExtension) Read(b []byte) (int, error)

type FakeRecordSizeLimitExtension added in v1.5.3 

type FakeRecordSizeLimitExtension struct {
	Limit uint16
}

func (*FakeRecordSizeLimitExtension) Len added in v1.5.3 

func (e *FakeRecordSizeLimitExtension) Len() int

func (*FakeRecordSizeLimitExtension) Read added in v1.5.3 

func (e *FakeRecordSizeLimitExtension) Read(b []byte) (int, error)

type Fingerprinter added in v1.5.3 

type Fingerprinter struct {
	// KeepPSK will ensure that the PreSharedKey extension is passed along into the resulting ClientHelloSpec as-is
	KeepPSK bool
	// AllowBluntMimicry will ensure that unknown extensions are
	// passed along into the resulting ClientHelloSpec as-is
	// It will not ensure that the PSK is passed along, if you require that, use KeepPSK
	// WARNING: there could be numerous subtle issues with ClientHelloSpecs
	// that are generated with this flag which could compromise security and/or mimicry
	AllowBluntMimicry bool
	// AlwaysAddPadding will always add a UtlsPaddingExtension with BoringPaddingStyle
	// at the end of the extensions list if it isn't found in the fingerprinted hello.
	// This could be useful in scenarios where the hello you are fingerprinting does not
	// have any padding, but you suspect that other changes you make to the final hello
	// (including things like different SNI lengths) would cause padding to be necessary
	AlwaysAddPadding bool
}

Fingerprinter is a struct largely for holding options for the FingerprintClientHello func

func (*Fingerprinter) FingerprintClientHello added in v1.5.3 

func (f *Fingerprinter) FingerprintClientHello(data []byte) (*ClientHelloSpec, error)

FingerprintClientHello returns a ClientHelloSpec which is based on the ClientHello that is passed in as the data argument

If the ClientHello passed in has extensions that are not recognized or cannot be handled it will return a non-nil error and a nil *ClientHelloSpec value

The data should be the full tls record, including the record type/version/length header as well as the handshake type/length/version header https://tools.ietf.org/html/rfc5246#section-6.2 https://tools.ietf.org/html/rfc5246#section-7.4

type FinishedHash added in v1.5.3 

type FinishedHash struct {
	Client hash.Hash
	Server hash.Hash

	// Prior to TLS 1.2, an additional MD5 hash is required.
	ClientMD5 hash.Hash
	ServerMD5 hash.Hash

	// In TLS 1.2, a full buffer is sadly required.
	Buffer []byte

	Version uint16
	Prf     func(result, secret, label, seed []byte)
}

A FinishedHash calculates the hash of a set of handshake messages suitable for including in a Finished message.

type GenericExtension added in v1.5.3 

type GenericExtension struct {
	Id   uint16
	Data []byte
}

GenericExtension allows to include in ClientHello arbitrary unsupported extensions.

func (*GenericExtension) Len added in v1.5.3 

func (e *GenericExtension) Len() int

func (*GenericExtension) Read added in v1.5.3 

func (e *GenericExtension) Read(b []byte) (int, error)

type KeyShare added in v1.5.3 

type KeyShare struct {
	Group CurveID
	Data  []byte
}

TLS 1.3 Key Share. See RFC 8446, Section 4.2.8.

type KeyShares added in v1.5.3 

type KeyShares []KeyShare

func (KeyShares) ToPrivate added in v1.5.3 

func (KSS KeyShares) ToPrivate() []keyShare

type NPNExtension added in v1.5.3 

type NPNExtension struct {
	NextProtos []string
}

func (*NPNExtension) Len added in v1.5.3 

func (e *NPNExtension) Len() int

func (*NPNExtension) Read added in v1.5.3 

func (e *NPNExtension) Read(b []byte) (int, error)

type PRNGSeed added in v1.5.3 

type PRNGSeed [PRNGSeedLength]byte

PRNGSeed is a PRNG seed.

func NewPRNGSeed added in v1.5.3 

func NewPRNGSeed() (*PRNGSeed, error)

NewPRNGSeed creates a new PRNG seed using crypto/rand.Read.

type PSKKeyExchangeModesExtension added in v1.5.3 

type PSKKeyExchangeModesExtension struct {
	Modes []uint8
}

func (*PSKKeyExchangeModesExtension) Len added in v1.5.3 

func (e *PSKKeyExchangeModesExtension) Len() int

func (*PSKKeyExchangeModesExtension) Read added in v1.5.3 

func (e *PSKKeyExchangeModesExtension) Read(b []byte) (int, error)

type RecordHeaderError added in v1.5.3 

type RecordHeaderError struct {
	// Msg contains a human readable string that describes the error.
	Msg string
	// RecordHeader contains the five bytes of TLS record header that
	// triggered the error.
	RecordHeader [5]byte
	// Conn provides the underlying net.Conn in the case that a client
	// sent an initial handshake that didn't look like TLS.
	// It is nil if there's already been a handshake or a TLS alert has
	// been written to the connection.
	Conn net.Conn
}

RecordHeaderError is returned when a TLS record header is invalid.

func (RecordHeaderError) Error added in v1.5.3 

func (e RecordHeaderError) Error() string

type RenegotiationInfoExtension added in v1.5.3 

type RenegotiationInfoExtension struct {
	// Renegotiation field limits how many times client will perform renegotiation: no limit, once, or never.
	// The extension still will be sent, even if Renegotiation is set to RenegotiateNever.
	Renegotiation RenegotiationSupport
}

func (*RenegotiationInfoExtension) Len added in v1.5.3 

func (e *RenegotiationInfoExtension) Len() int

func (*RenegotiationInfoExtension) Read added in v1.5.3 

func (e *RenegotiationInfoExtension) Read(b []byte) (int, error)

type RenegotiationSupport added in v1.5.3 

type RenegotiationSupport int

RenegotiationSupport enumerates the different levels of support for TLS renegotiation. TLS renegotiation is the act of performing subsequent handshakes on a connection after the first. This significantly complicates the state machine and has been the source of numerous, subtle security issues. Initiating a renegotiation is not supported, but support for accepting renegotiation requests may be enabled.

Even when enabled, the server may not change its identity between handshakes (i.e. the leaf certificate must be the same). Additionally, concurrent handshake and application data flow is not permitted so renegotiation can only be used with protocols that synchronise with the renegotiation, such as HTTPS.

Renegotiation is not defined in TLS 1.3. 

const (
	// RenegotiateNever disables renegotiation.
	RenegotiateNever RenegotiationSupport = iota

	// RenegotiateOnceAsClient allows a remote server to request
	// renegotiation once per connection.
	RenegotiateOnceAsClient

	// RenegotiateFreelyAsClient allows a remote server to repeatedly
	// request renegotiation.
	RenegotiateFreelyAsClient
)

type Roller added in v1.5.3 

type Roller struct {
	HelloIDs            []ClientHelloID
	HelloIDMu           sync.Mutex
	WorkingHelloID      *ClientHelloID
	TcpDialTimeout      time.Duration
	TlsHandshakeTimeout time.Duration
	// contains filtered or unexported fields
}

func NewRoller added in v1.5.3 

func NewRoller() (*Roller, error)

NewRoller creates Roller object with default range of HelloIDs to cycle through until a working/unblocked one is found.

func (*Roller) Dial added in v1.5.3 

func (c *Roller) Dial(network, addr, serverName string) (*UConn, error)

Dial attempts to establish connection to given address using different HelloIDs. If a working HelloID is found, it is used again for subsequent Dials. If tcp connection fails or all HelloIDs are tried, returns with last error.

Usage examples: 

Dial("tcp4", "google.com:443", "google.com")
Dial("tcp", "10.23.144.22:443", "mywebserver.org")

type SCTExtension added in v1.5.3 

type SCTExtension struct {
}

func (*SCTExtension) Len added in v1.5.3 

func (e *SCTExtension) Len() int

func (*SCTExtension) Read added in v1.5.3 

func (e *SCTExtension) Read(b []byte) (int, error)

type SNIExtension added in v1.5.3 

type SNIExtension struct {
	ServerName string // not an array because go crypto/tls doesn't support multiple SNIs
}

func (*SNIExtension) Len added in v1.5.3 

func (e *SNIExtension) Len() int

func (*SNIExtension) Read added in v1.5.3 

func (e *SNIExtension) Read(b []byte) (int, error)

type ServerHelloMsg added in v1.5.3 

type ServerHelloMsg struct {
	Raw                          []byte
	Vers                         uint16
	Random                       []byte
	SessionId                    []byte
	CipherSuite                  uint16
	CompressionMethod            uint8
	NextProtoNeg                 bool
	NextProtos                   []string
	OcspStapling                 bool
	Scts                         [][]byte
	Ems                          bool
	TicketSupported              bool
	SecureRenegotiation          []byte
	SecureRenegotiationSupported bool
	AlpnProtocol                 string

	// 1.3
	SupportedVersion        uint16
	ServerShare             keyShare
	SelectedIdentityPresent bool
	SelectedIdentity        uint16
	Cookie                  []byte  // HelloRetryRequest extension
	SelectedGroup           CurveID // HelloRetryRequest extension

}

type SessionTicketExtension added in v1.5.3 

type SessionTicketExtension struct {
	Session *ClientSessionState
}

func (*SessionTicketExtension) Len added in v1.5.3 

func (e *SessionTicketExtension) Len() int

func (*SessionTicketExtension) Read added in v1.5.3 

func (e *SessionTicketExtension) Read(b []byte) (int, error)

type SignatureAlgorithmsExtension added in v1.5.3 

type SignatureAlgorithmsExtension struct {
	SupportedSignatureAlgorithms []SignatureScheme
}

func (*SignatureAlgorithmsExtension) Len added in v1.5.3 

func (e *SignatureAlgorithmsExtension) Len() int

func (*SignatureAlgorithmsExtension) Read added in v1.5.3 

func (e *SignatureAlgorithmsExtension) Read(b []byte) (int, error)

type SignatureScheme added in v1.5.3 

type SignatureScheme uint16

SignatureScheme identifies a signature algorithm supported by TLS. See RFC 8446, Section 4.2.3. 

const (
	// RSASSA-PKCS1-v1_5 algorithms.
	PKCS1WithSHA256 SignatureScheme = 0x0401
	PKCS1WithSHA384 SignatureScheme = 0x0501
	PKCS1WithSHA512 SignatureScheme = 0x0601

	// RSASSA-PSS algorithms with public key OID rsaEncryption.
	PSSWithSHA256 SignatureScheme = 0x0804
	PSSWithSHA384 SignatureScheme = 0x0805
	PSSWithSHA512 SignatureScheme = 0x0806

	// ECDSA algorithms. Only constrained to a specific curve in TLS 1.3.
	ECDSAWithP256AndSHA256 SignatureScheme = 0x0403
	ECDSAWithP384AndSHA384 SignatureScheme = 0x0503
	ECDSAWithP521AndSHA512 SignatureScheme = 0x0603

	// Legacy signature and hash algorithms for TLS 1.2.
	PKCS1WithSHA1 SignatureScheme = 0x0201
	ECDSAWithSHA1 SignatureScheme = 0x0203
)
var (
	FakePKCS1WithSHA224 SignatureScheme = 0x0301
	FakeECDSAWithSHA224 SignatureScheme = 0x0303
)

newest signatures

type StatusRequestExtension added in v1.5.3 

type StatusRequestExtension struct {
}

func (*StatusRequestExtension) Len added in v1.5.3 

func (e *StatusRequestExtension) Len() int

func (*StatusRequestExtension) Read added in v1.5.3 

func (e *StatusRequestExtension) Read(b []byte) (int, error)

type SupportedCurvesExtension added in v1.5.3 

type SupportedCurvesExtension struct {
	Curves []CurveID
}

func (*SupportedCurvesExtension) Len added in v1.5.3 

func (e *SupportedCurvesExtension) Len() int

func (*SupportedCurvesExtension) Read added in v1.5.3 

func (e *SupportedCurvesExtension) Read(b []byte) (int, error)

type SupportedPointsExtension added in v1.5.3 

type SupportedPointsExtension struct {
	SupportedPoints []uint8
}

func (*SupportedPointsExtension) Len added in v1.5.3 

func (e *SupportedPointsExtension) Len() int

func (*SupportedPointsExtension) Read added in v1.5.3 

func (e *SupportedPointsExtension) Read(b []byte) (int, error)

type SupportedVersionsExtension added in v1.5.3 

type SupportedVersionsExtension struct {
	Versions []uint16
}

func (*SupportedVersionsExtension) Len added in v1.5.3 

func (e *SupportedVersionsExtension) Len() int

func (*SupportedVersionsExtension) Read added in v1.5.3 

func (e *SupportedVersionsExtension) Read(b []byte) (int, error)

type TLS12OnlyState added in v1.5.3 

type TLS12OnlyState struct {
	FinishedHash FinishedHash
	Suite        CipherSuite
}

TLS 1.2 and before only

type TLSExtension added in v1.5.3 

type TLSExtension interface {
	Len() int // includes header

	// Read reads up to len(p) bytes into p.
	// It returns the number of bytes read (0 <= n <= len(p)) and any error encountered.
	Read(p []byte) (n int, err error) // implements io.Reader
	// contains filtered or unexported methods
}

type TicketKey added in v1.5.3 

type TicketKey struct {
	// KeyName is an opaque byte string that serves to identify the session
	// ticket key. It's exposed as plaintext in every session ticket.
	KeyName [ticketKeyNameLen]byte
	AesKey  [16]byte
	HmacKey [16]byte
}

TicketKey is the internal representation of a session ticket key.

func TicketKeyFromBytes added in v1.5.3 

func TicketKeyFromBytes(b [32]byte) TicketKey

func (TicketKey) ToPrivate added in v1.5.3 

func (TK TicketKey) ToPrivate() ticketKey

type TicketKeys added in v1.5.3 

type TicketKeys []TicketKey

func (TicketKeys) ToPrivate added in v1.5.3 

func (TKS TicketKeys) ToPrivate() []ticketKey

type Transport 

type Transport struct {
	Conn *UConn
	Spec ClientHelloSpec
}

func (*Transport) RoundTrip 

func (t *Transport) RoundTrip(req *http.Request) (*http.Response, error)

type UConn added in v1.5.3 

type UConn struct {
	*Conn

	Extensions    []TLSExtension
	ClientHelloID ClientHelloID

	ClientHelloBuilt bool
	HandshakeState   ClientHandshakeState

	// sessionID may or may not depend on ticket; nil => random
	GetSessionID func(ticket []byte) [32]byte
	// contains filtered or unexported fields
}

func UClient added in v1.5.3 

func UClient(conn net.Conn, config *Config, clientHelloID ClientHelloID) *UConn

UClient returns a new uTLS client, with behavior depending on clientHelloID. Config CAN be nil, but make sure to eventually specify ServerName.

func (*UConn) ApplyConfig added in v1.5.3 

func (uconn *UConn) ApplyConfig() error

func (*UConn) ApplyPreset added in v1.5.3 

func (uconn *UConn) ApplyPreset(p *ClientHelloSpec) error

ApplyPreset should only be used in conjunction with HelloCustom to apply custom specs. Fields of TLSExtensions that are slices/pointers are shared across different connections with same ClientHelloSpec. It is advised to use different specs and avoid any shared state.

func (*UConn) BuildHandshakeState added in v1.5.3 

func (uconn *UConn) BuildHandshakeState() error

BuildHandshakeState behavior varies based on ClientHelloID and whether it was already called before. If HelloGolang: 

[only once] make default ClientHello and overwrite existing state

If any other mimicking ClientHelloID is used: 

[only once] make ClientHello based on ID and overwrite existing state
[each call] apply uconn.Extensions config to internal crypto/tls structures
[each call] marshal ClientHello.

BuildHandshakeState is automatically called before uTLS performs handshake, amd should only be called explicitly to inspect/change fields of default/mimicked ClientHello.

func (*UConn) GetUnderlyingConn added in v1.5.3 

func (uconn *UConn) GetUnderlyingConn() net.Conn

func (*UConn) Handshake added in v1.5.3 

func (c *UConn) Handshake() error

Handshake runs the client handshake using given clientHandshakeState Requires hs.hello, and, optionally, hs.session to be set.

func (*UConn) MarshalClientHello added in v1.5.3 

func (uconn *UConn) MarshalClientHello() error

func (*UConn) SetClientRandom added in v1.5.3 

func (uconn *UConn) SetClientRandom(r []byte) error

SetClientRandom sets client random explicitly. BuildHandshakeFirst() must be called before SetClientRandom. r must to be 32 bytes long.

func (*UConn) SetSNI added in v1.5.3 

func (uconn *UConn) SetSNI(sni string)

func (*UConn) SetSessionCache added in v1.5.3 

func (uconn *UConn) SetSessionCache(cache ClientSessionCache)

If you want session tickets to be reused - use same cache on following connections

func (*UConn) SetSessionState added in v1.5.3 

func (uconn *UConn) SetSessionState(session *ClientSessionState) error

SetSessionState sets the session ticket, which may be preshared or fake. If session is nil, the body of session ticket extension will be unset, but the extension itself still MAY be present for mimicking purposes. Session tickets to be reused - use same cache on following connections.

func (*UConn) SetTLSVers added in v1.5.3 

func (uconn *UConn) SetTLSVers(minTLSVers, maxTLSVers uint16, specExtensions []TLSExtension) error

SetTLSVers sets min and max TLS version in all appropriate places. Function will use first non-zero version parsed in following order:

  1. Provided minTLSVers, maxTLSVers
  2. specExtensions may have SupportedVersionsExtension
  3. [default] min = TLS 1.0, max = TLS 1.2

Error is only returned if things are in clearly undesirable state to help user fix them.

func (*UConn) SetUnderlyingConn added in v1.5.3 

func (uconn *UConn) SetUnderlyingConn(c net.Conn)

func (*UConn) Write added in v1.5.3 

func (c *UConn) Write(b []byte) (int, error)

Copy-pasted from tls.Conn in its entirety. But c.Handshake() is now utls' one, not tls. Write writes data to the connection.

type UtlsExtendedMasterSecretExtension added in v1.5.3 

type UtlsExtendedMasterSecretExtension struct {
}

func (*UtlsExtendedMasterSecretExtension) Len added in v1.5.3 

func (e *UtlsExtendedMasterSecretExtension) Len() int

func (*UtlsExtendedMasterSecretExtension) Read added in v1.5.3 

func (e *UtlsExtendedMasterSecretExtension) Read(b []byte) (int, error)

type UtlsGREASEExtension added in v1.5.3 

type UtlsGREASEExtension struct {
	Value uint16
	Body  []byte // in Chrome first grease has empty body, second grease has a single zero byte
}

it is responsibility of user not to generate multiple grease extensions with same value

func (*UtlsGREASEExtension) Len added in v1.5.3 

func (e *UtlsGREASEExtension) Len() int

func (*UtlsGREASEExtension) Read added in v1.5.3 

func (e *UtlsGREASEExtension) Read(b []byte) (int, error)

type UtlsPaddingExtension added in v1.5.3 

type UtlsPaddingExtension struct {
	PaddingLen int
	WillPad    bool // set to false to disable extension

	// Functor for deciding on padding length based on unpadded ClientHello length.
	// If willPad is false, then this extension should not be included.
	GetPaddingLen func(clientHelloUnpaddedLen int) (paddingLen int, willPad bool)
}

func (*UtlsPaddingExtension) Len added in v1.5.3 

func (e *UtlsPaddingExtension) Len() int

func (*UtlsPaddingExtension) Read added in v1.5.3 

func (e *UtlsPaddingExtension) Read(b []byte) (int, error)

func (*UtlsPaddingExtension) Update added in v1.5.3 

func (e *UtlsPaddingExtension) Update(clientHelloUnpaddedLen int)

Notes

Bugs

Source Files

View all Source files

Directories

Path Synopsis
Package cpu implements processor feature detection used by the Go standard library.
 Package cpu implements processor feature detection used by the Go standard library.

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