tls

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 Go to latest Published: Sep 5, 2017 License: BSD-3-Clause Imports: 38 Imported by: 1

README

uTLS

Low-level access to handshake

  • Read/write access to all bits of client hello message.
  • Read access to fields of ClientHandshakeState, which, among other things, includes ServerHello and MasterSecret.

ClientHello fingerprinting resistance

Golang's ClientHello has a very unique fingerprint, which especially sticks out on mobile clients, where Golang is not too popular yet. Some members of anti-censorship community are concerned that their tools could be trivially blocked based on ClientHello with relatively small collateral damage. There are multiple solutions to this issue.

Randomized handshake

This package can be used to generate randomized ClientHello. Provides a moving target without any compatibility or parrot-is-dead attack risks.
Feedback about implementation details of randomized handshake is extremely appreciated.

Parroting

This package can be used to parrot ClientHello of popular browsers. There are some caveats to this parroting:

  • We are forced to offer ciphersuites and tls extensions that are not supported by crypto/tls. This is not a problem, if you fully control the server and turn unsupported things off on server side.
  • Parroting could be imperfect, and there is no parroting beyond ClientHello.
Compatibility risks of available parrots

This package allows ClientHello messages to parrot popular browsers. There are few caveats to this parroting:

  • We are forced to offer ciphersuites and tls extensions setups that are not supported by crypto/tls. This is not a problem, if you fully control the server.
  • Parroting could be imperfect, and there is no parroting beyond ClientHello.\
Parrot Ciphers* Signature* Unsupported extensions
Android 5.1 low very low None
Android 6.0 low very low None
Chrome 58 no low ChannelID
Firefox 55 very low low None

* Denotes very rough guesstimate of likelihood that unsupported things will get echoed back by the server in the wild, visibly breaking the connection.

Parrots FAQ

Does it really look like, say, Google Chrome with all the GREASE and stuff?

It LGTM, but please open up Wireshark and check. If you see something — say something.

Aren't there side channels? Everybody knows that the bird is a wordparrot is dead

There sure are. If you found one that approaches practicality at line speed — please tell us.

Things to implement in Golang to make parrots better
  • Extended ChannelID extensions
  • Enable sha512 and sha224 hashes by default
  • Implement RSA PSS signature algorithms
  • In general, any modern crypto is likely to be useful going forward.
Custom Handshake

It is possible to create custom handshake by

  1. Use HelloCustom as an argument for UClient() to get empty config
  2. Fill tls header fields: UConn.Hello.{Random, CipherSuites, CompressionMethods}, if needed, or stick to defaults.
  3. Configure and add various TLS Extensions to UConn.Extensions: they will be marshaled in order.
  4. Set Session and SessionCache, as needed.

If you need to manually control all the bytes on the wire(certainly not recommended!), you can set UConn.HandshakeStateBuilt = true, and marshal clientHello into UConn.HandshakeState.Hello.raw yourself. In this case you will be responsible for modifying other parts of Config and ClientHelloMsg to reflect your setup.

Fake Session Tickets

Set of provided functions is likely to change, as use-cases aren't fully worked out yet. Currently, there is a simple function to set session ticket to any desired state:

func (c *ExtendedConfig) SetSessionState(session *ClientSessionState)

Note that session tickets (fake ones or otherwise) are not reused.
To reuse tickets, create a shared cache and set it on current and further configs:

func (c *ExtendedConfig) SetSessionCache(cache ClientSessionCache)

Usage

Find other examples here.

For a reference, here's how default "crypto/tls" is used:

    config := tls.Config{ServerName: "www.google.com"}
    dialConn, err := net.Dial("tcp", "172.217.11.46:443")
    if err != nil {
        fmt.Printf("net.Dial() failed: %+v\n", err)
        return
    }
    tlsConn := tls.Client(dialConn, &config)
    err = tlsConn.Handshake()
    if err != nil {
    fmt.Printf("tlsConn.Handshake() error: %+v", err)
        return
    }

Now, if you want to use uTLS, simply substitute tlsConn := tls.Client(dialConn, &config) with tlsConn := utls.UClient(dialConn, &config, clientHelloID) where clientHelloID is one of the following:

  1. utls.HelloRandomized adds/reorders extensions, ciphersuites, etc. randomly.
    HelloRandomized adds ALPN in 50% of cases, you may want to use HelloRandomizedALPN or HelloRandomizedNoALPN to choose specific behavior explicitly, as ALPN might affect application layer.
  2. utls.HelloGolang 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.
  3. utls.HelloCustom will prepare ClientHello with empty uconn.Extensions so you can fill it with TLSExtension's manually.
  4. The rest will will parrot given browser.
    • utls.HelloChrome_Auto- parrots recommended(latest) Google Chrome version
    • utls.HelloChrome_58 - parrots Google Chrome 58
    • utls.HelloFirefox_Auto - parrots recommended(latest) Firefox version
    • utls.HelloFirefox_5 - parrots Firefox 55
    • utls.HelloAndroid_Auto
    • utls.HelloAndroid_6_0_Browser
    • utls.HelloAndroid_5_1_Browser

Note: it is mandatory to manually call tlsConn.Handshake() afterwards. Otherwise, eventual tls.Write() is going to call non-overridden version of handshake.

Customizing handshake

Before doing Handshake() you can also set fake session ticket, set clientHello or change uconn in other ways:

    cRandom := []byte{100, 101, 102, 103, 104, 105, 106, 107, 108, 109,
        110, 111, 112, 113, 114, 115, 116, 117, 118, 119,
        120, 121, 122, 123, 124, 125, 126, 127, 128, 129,
        130, 131}
    tlsConn.SetClientRandom(cRandom)
    masterSecret := make([]byte, 48)
    copy(masterSecret, []byte("masterSecret is NOT sent over the wire")) // you may use it for real security

    // Create a session ticket that wasn't actually issued by the server.
    sessionState := utls.MakeClientSessionState(sessionTicket, uint16(tls.VersionTLS12),
        tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
        masterSecret,
        nil, nil)
    tlsConn.SetSessionState(sessionState)

This is not an official Google product.

Documentation

Overview

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

Index

Examples

Constants

View Source 
const (
	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_FALLBACK_SCSV isn't a standard cipher suite but an indicator
	// that the client is doing version fallback. See
	// https://tools.ietf.org/html/rfc7507.
	TLS_FALLBACK_SCSV uint16 = 0x5600
)

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

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

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

	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_RSA_WITH_RC4_128_MD5          = uint16(0x0004)
	FAKE_TLS_EMPTY_RENEGOTIATION_INFO_SCSV = uint16(0x00ff)
)

Variables

This section is empty.

Functions

func GetBoringGREASEValue 

func GetBoringGREASEValue(clientRandom []byte, index int) uint16

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

func Listen 

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 

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 

type ALPNExtension struct {
	AlpnProtocols []string
}

func (*ALPNExtension) Len 

func (e *ALPNExtension) Len() int

func (*ALPNExtension) Read 

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

type BensStruct 

type BensStruct serverHelloMsg

type Certificate 

type Certificate struct {
	Certificate [][]byte
	// PrivateKey contains the private key corresponding to the public key
	// in Leaf. For a server, this must implement crypto.Signer and/or
	// crypto.Decrypter, with an RSA or ECDSA PublicKey. For a client
	// (performing client authentication), this must be a crypto.Signer
	// with an RSA or ECDSA 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 LoadX509KeyPair 

func LoadX509KeyPair(certFile, keyFile string) (Certificate, error)

LoadX509KeyPair reads and parses a public/private key pair from a pair of files. The files must contain PEM encoded data. The certificate file may contain intermediate certificates following the leaf certificate to form a certificate chain. On successful return, Certificate.Leaf will be nil because the parsed form of the certificate is not retained.

func X509KeyPair 

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.

type CertificateRequestInfo 

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 CipherSuite 

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) cipher.AEAD
}

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

type ClientAuthType 

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 

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

type ClientHelloID 

type ClientHelloID struct {
	Browser string
	Version uint16
}
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 = ClientHelloID{helloGolang, helloAutoVers}

	// HelloCustom will prepare ClientHello with empty uconn.Extensions so you can fill it with TLSExtension's manually
	HelloCustom ClientHelloID = ClientHelloID{helloCustom, helloAutoVers}

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

	// The rest will will parrot given browser.
	HelloFirefox_Auto ClientHelloID = ClientHelloID{helloFirefox, helloAutoVers}
	HelloFirefox_55                 = ClientHelloID{helloFirefox, 55}

	HelloChrome_Auto ClientHelloID = ClientHelloID{helloChrome, helloAutoVers}
	HelloChrome_58   ClientHelloID = ClientHelloID{helloChrome, 58}

	HelloAndroid_Auto        ClientHelloID = ClientHelloID{helloAndroid, helloAutoVers}
	HelloAndroid_6_0_Browser ClientHelloID = ClientHelloID{helloAndroid, 23}
	HelloAndroid_5_1_Browser ClientHelloID = ClientHelloID{helloAndroid, 22}
)

func (*ClientHelloID) Str 

func (p *ClientHelloID) Str() string

type ClientHelloInfo 

type ClientHelloInfo struct {
	// CipherSuites lists the CipherSuites supported by the client (e.g.
	// TLS_RSA_WITH_RC4_128_SHA).
	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
	// http://tools.ietf.org/html/rfc4366#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
	// http://tools.ietf.org/html/rfc4492#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
	// http://tools.ietf.org/html/rfc4492#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
	// https://tools.ietf.org/html/rfc5246#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
	// https://tools.ietf.org/html/rfc7301#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 

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
	SupportedCurves              []CurveID
	SupportedPoints              []uint8
	TicketSupported              bool
	SessionTicket                []uint8
	SignatureAndHashes           []SignatureAndHash
	SecureRenegotiation          []byte
	SecureRenegotiationSupported bool
	AlpnProtocols                []string
}

type ClientSessionCache 

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.
	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. Only ticket-based resumption is supported, not SessionID-based resumption.

func NewLRUClientSessionCache 

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 

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

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

func MakeClientSessionState 

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 

func (css *ClientSessionState) CipherSuite() uint16

Ciphersuite negotiated for the session

func (*ClientSessionState) MasterSecret 

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

MasterSecret generated by client on a full handshake

func (*ClientSessionState) ServerCertificates 

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

Certificate chain presented by the server

func (*ClientSessionState) SessionTicket 

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

Encrypted ticket used for session resumption with server

func (*ClientSessionState) SetCipherSuite 

func (css *ClientSessionState) SetCipherSuite(CipherSuite uint16)

func (*ClientSessionState) SetMasterSecret 

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

func (*ClientSessionState) SetServerCertificates 

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

func (*ClientSessionState) SetSessionTicket 

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

func (*ClientSessionState) SetVerifiedChains 

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

func (*ClientSessionState) SetVers 

func (css *ClientSessionState) SetVers(Vers uint16)

func (*ClientSessionState) VerifiedChains 

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

Certificate chains we built for verification

func (*ClientSessionState) Vers 

func (css *ClientSessionState) Vers() uint16

SSL/TLS version negotiated for the session

type Config 

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 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.
	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. If CipherSuites
	// is nil, TLS uses a list of suites supported by the implementation.
	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
	// (resumption) support.
	SessionTicketsDisabled bool

	// SessionTicketKey is used by TLS servers to provide session
	// resumption. See RFC 5077. 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 are compromised.
	SessionTicketKey [32]byte

	// SessionCache is a cache of ClientSessionState entries for TLS session
	// resumption.
	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 1.2.
	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.
	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:

CLIENT_RANDOM 0000000000000000000000000000000000000000000000000000000000000000 baca0df460a688e44ce018b025183cc2353ae01f89755ef766eedd3ecc302888ee3b3a22962e45f48c20df15a98c0e80

func (*Config) BuildNameToCertificate 

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 

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 

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 

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

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

func Client 

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 

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 

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 Server 

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 

func (c *Conn) Close() error

Close closes the connection.

func (*Conn) CloseWrite 

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 

func (c *Conn) ConnectionState() ConnectionState

ConnectionState returns basic TLS details about the connection.

func (*Conn) Handshake 

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 

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

LocalAddr returns the local network address.

func (*Conn) OCSPResponse 

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 

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

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

RemoteAddr returns the remote network address.

func (*Conn) SetDeadline 

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 

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 

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 

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 

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

Write writes data to the connection.

type ConnectionState 

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_RSA_WITH_RC4_128_SHA, ...)
	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 server, if any
	OCSPResponse                []byte                // stapled OCSP response from server, 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.
	TLSUnique []byte
}

ConnectionState records basic TLS details about the connection.

type CurveID 

type CurveID uint16

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

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

type FakeChannelIDExtension 

type FakeChannelIDExtension struct {
}

func (*FakeChannelIDExtension) Len 

func (e *FakeChannelIDExtension) Len() int

func (*FakeChannelIDExtension) Read 

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

type FakeGREASEExtension 

type FakeGREASEExtension 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 (*FakeGREASEExtension) Len 

func (e *FakeGREASEExtension) Len() int

func (*FakeGREASEExtension) Read 

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

type FinishedHash 

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 NPNExtension 

type NPNExtension struct {
	NextProtos []string
}

func (*NPNExtension) Len 

func (e *NPNExtension) Len() int

func (*NPNExtension) Read 

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

type RecordHeaderError 

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
}

RecordHeaderError results when a TLS record header is invalid.

func (RecordHeaderError) Error 

func (e RecordHeaderError) Error() string

type RenegotiationInfoExtension 

type RenegotiationInfoExtension struct {
	SecureRenegotiation []byte // you probably want to leave it empty
	// contains filtered or unexported fields
}

func (*RenegotiationInfoExtension) Len 

func (e *RenegotiationInfoExtension) Len() int

func (*RenegotiationInfoExtension) Read 

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

type RenegotiationSupport 

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. 

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 SCTExtension 

type SCTExtension struct {
}

func (*SCTExtension) Len 

func (e *SCTExtension) Len() int

func (*SCTExtension) Read 

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

type SNIExtension 

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

func (*SNIExtension) Len 

func (e *SNIExtension) Len() int

func (*SNIExtension) Read 

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

type ServerHelloMsg 

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
}

type SessionTicketExtension 

type SessionTicketExtension struct {
	Session *ClientSessionState
}

func (*SessionTicketExtension) Len 

func (e *SessionTicketExtension) Len() int

func (*SessionTicketExtension) Read 

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

type SignatureAlgorithmsExtension 

type SignatureAlgorithmsExtension struct {
	SignatureAndHashes []SignatureAndHash
}

func (*SignatureAlgorithmsExtension) Len 

func (e *SignatureAlgorithmsExtension) Len() int

func (*SignatureAlgorithmsExtension) Read 

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

type SignatureAndHash 

type SignatureAndHash struct {
	Hash, Signature uint8
}

SignatureAndHash mirrors the TLS 1.2, SignatureAndHashAlgorithm struct. See RFC 5246, section A.4.1.

type SignatureScheme 

type SignatureScheme uint16

SignatureScheme identifies a signature algorithm supported by TLS. See https://tools.ietf.org/html/draft-ietf-tls-tls13-18#section-4.2.3. 

const (
	PKCS1WithSHA1   SignatureScheme = 0x0201
	PKCS1WithSHA256 SignatureScheme = 0x0401
	PKCS1WithSHA384 SignatureScheme = 0x0501
	PKCS1WithSHA512 SignatureScheme = 0x0601

	PSSWithSHA256 SignatureScheme = 0x0804
	PSSWithSHA384 SignatureScheme = 0x0805
	PSSWithSHA512 SignatureScheme = 0x0806

	ECDSAWithP256AndSHA256 SignatureScheme = 0x0403
	ECDSAWithP384AndSHA384 SignatureScheme = 0x0503
	ECDSAWithP521AndSHA512 SignatureScheme = 0x0603
)

type StatusRequestExtension 

type StatusRequestExtension struct {
}

func (*StatusRequestExtension) Len 

func (e *StatusRequestExtension) Len() int

func (*StatusRequestExtension) Read 

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

type SupportedCurvesExtension 

type SupportedCurvesExtension struct {
	Curves []CurveID
}

func (*SupportedCurvesExtension) Len 

func (e *SupportedCurvesExtension) Len() int

func (*SupportedCurvesExtension) Read 

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

type SupportedPointsExtension 

type SupportedPointsExtension struct {
	SupportedPoints []uint8
}

func (*SupportedPointsExtension) Len 

func (e *SupportedPointsExtension) Len() int

func (*SupportedPointsExtension) Read 

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

type TLSExtension 

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 UConn 

type UConn struct {
	*Conn

	Extensions []TLSExtension

	HandshakeState ClientHandshakeState

	HandshakeStateBuilt bool
	// contains filtered or unexported fields
}

func UClient 

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) BuildHandshakeState 

func (uconn *UConn) BuildHandshakeState() error

BuildHandshakeState() overwrites most fields, therefore, it is advised to manually call this function, if you need to inspect/change contents after parroting/making default Golang ClientHello. Otherwise, there is no need to call this function explicitly.

func (*UConn) Handshake 

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) SetClientRandom 

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

r has to be 32 bytes long

func (*UConn) SetSNI 

func (uconn *UConn) SetSNI(sni string)

func (*UConn) SetSessionCache 

func (uconn *UConn) SetSessionCache(cache ClientSessionCache)

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

func (*UConn) SetSessionState 

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

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

func (*UConn) Write 

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.

Notes

Bugs

Source Files

View all Source files

Directories

Path Synopsis
Package cipherhw exposes common functions for detecting whether hardware support for certain ciphers and authenticators is present.
 Package cipherhw exposes common functions for detecting whether hardware support for certain ciphers and authenticators is present.
Package testenv provides information about what functionality is available in different testing environments run by the Go team.
 Package testenv provides information about what functionality is available in different testing environments run by the Go team.

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