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Published: Feb 7, 2019 License: MIT, BSD-3-Clause Imports: 42 Imported by: 0


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|_   _| |   / ___|      | |_ _ __(_)___
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  | | | |___ ___) |_____| |_| |  | \__ \
  |_| |_____|____/       \__|_|  |_|___/

crypto/tls, now with 100% more 1.3.


Build Status


Since crypto/tls is very deeply (and not that elegantly) coupled with the Go stdlib, tls-tris shouldn't be used as an external package. It is also impossible to vendor it as crypto/tls because stdlib packages would import the standard one and mismatch.

So, to build with tls-tris, you need to use a custom GOROOT.

A script is provided that will take care of it for you: ./_dev/go.sh. Just use that instead of the go tool.

The script also transparently fetches the custom Cloudflare Go 1.10 compiler with the required backports.



Copy paste line bellow to install all required dependencies:

  • ArchLinux:
pacman -S go docker gcc git make patch python2 python-docker rsync
  • Debian:
apt-get install build-essential docker go patch python python-pip rsync
pip install setuptools
pip install docker
  • Ubuntu (18.04) :
apt-get update
apt-get install build-essential docker docker.io golang patch python python-pip rsync sudo
pip install setuptools
pip install docker
sudo usermod -a -G docker $USER

Similar dependencies can be found on any UNIX based system/distribution.


There are number of things that need to be setup before running tests. Most important step is to copy go env GOROOT directory to _dev and swap TLS implementation and recompile GO. Then for testing we use go implementation from _dev/GOROOT.

git clone https://github.com/cloudflare/tls-tris.git
cd tls-tris; cp _dev/utils/pre-commit .git/hooks/ 
make -f _dev/Makefile build-all


We run 3 kinds of test:.

  • Unit testing:
    make -f _dev/Makefile test-unit
  • Testing against BoringSSL test suite:
    make -f _dev/Makefile test-bogo
  • Compatibility testing (see below):
    make -f _dev/Makefile test-interop

To run all the tests in one go use:

make -f _dev/Makefile test

Testing interoperability with 3rd party libraries

In order to ensure compatibility we are testing our implementation against BoringSSL, NSS and PicoTLS.

Makefile has a specific target for testing interoperability with external libraries. Following command can be used in order to run such test:

make -f _dev/Makefile test-interop

The makefile target is just a wrapper and it executes _dev/interop_test_runner script written in python. The script implements interoperability tests using python unittest framework.

Script can be started from command line directly. For example:

> ./interop_test_runner -v InteropServer_NSS.test_zero_rtt
test_zero_rtt (__main__.InteropServer_NSS) ... ok

Ran 1 test in 8.765s



When the environment variable TLSDEBUG is set to error, Tris will print a hexdump of the Client Hello and a stack trace if an handshake error occurs. If the value is short, only the error and the first meaningful stack frame are printed.



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



View Source
const (
	P503PubKeySz                  = 378
	P503PrvKeySz                  = 32
	P503SharedSecretSz            = 126
	SIDHp503Curve25519PubKeySz    = x25519SharedSecretSz + P503PubKeySz
	SIDHp503Curve25519PrvKeySz    = x25519SharedSecretSz + P503PrvKeySz
	SIDHp503Curve25519SharedKeySz = x25519SharedSecretSz + P503SharedSecretSz
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
	// 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
	VersionTLS13 = 0x0304
View Source
const (
	// Exported IDs
	CurveP256 = tls.CurveP256
	CurveP384 = tls.CurveP384
	CurveP521 = tls.CurveP521
	X25519    = tls.X25519

	// Experimental KEX
	HybridSIDHp503Curve25519 CurveID = 0xFE30
View Source
const (
	NoClientCert               = tls.NoClientCert
	RequestClientCert          = tls.RequestClientCert
	RequireAnyClientCert       = tls.RequireAnyClientCert
	VerifyClientCertIfGiven    = tls.VerifyClientCertIfGiven
	RequireAndVerifyClientCert = tls.RequireAndVerifyClientCert
View Source
const (
	PKCS1WithSHA1   = tls.PKCS1WithSHA1
	PKCS1WithSHA256 = tls.PKCS1WithSHA256
	PKCS1WithSHA384 = tls.PKCS1WithSHA384
	PKCS1WithSHA512 = tls.PKCS1WithSHA512

	PSSWithSHA256 = tls.PSSWithSHA256
	PSSWithSHA384 = tls.PSSWithSHA384
	PSSWithSHA512 = tls.PSSWithSHA512

	ECDSAWithP256AndSHA256 = tls.ECDSAWithP256AndSHA256
	ECDSAWithP384AndSHA384 = tls.ECDSAWithP384AndSHA384
	ECDSAWithP521AndSHA512 = tls.ECDSAWithP521AndSHA512

	// Legacy signature and hash algorithms for TLS 1.2.
View Source
const (
	// RenegotiateNever disables renegotiation.
	RenegotiateNever = tls.RenegotiateNever

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

	// RenegotiateFreelyAsClient allows a remote server to repeatedly
	// request renegotiation.
	RenegotiateFreelyAsClient = tls.RenegotiateFreelyAsClient


This section is empty.



func AEADAESGCM13(key, fixedNonce []byte) cipher.AEAD

AEADAESGCM13 creates a new AES-GCM AEAD for TLS 1.3

func HkdfExpandLabel

func HkdfExpandLabel(hash crypto.Hash, secret, hashValue []byte, label string, L int) []byte

HkdfExpandLabel HKDF expands a label

func HkdfExtract

func HkdfExtract(hash crypto.Hash, secret, salt []byte) []byte

HkdfExtract generates a pseudorandom key for use with Expand from an input secret and an optional independent salt.

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.


type Certificate

type Certificate = tls.Certificate

A Certificate is a tls.Certificate

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 = tls.CertificateRequestInfo

The CertificateRequestInfo is a tls.CertificateRequestInfo

type CipherSuite

type CipherSuite struct {
	// contains filtered or unexported fields

func (*CipherSuite) AEAD

func (c *CipherSuite) AEAD(key, fixedNonce []byte) cipher.AEAD

func (*CipherSuite) Hash

func (c *CipherSuite) Hash() crypto.Hash

func (*CipherSuite) IVLen

func (c *CipherSuite) IVLen() int

func (*CipherSuite) KeyLen

func (c *CipherSuite) KeyLen() int

type ClientAuthType

type ClientAuthType = tls.ClientAuthType

The ClientAuthType is the tls.ClientAuthType

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-
	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

	// Offered0RTTData is true if the client announced that it will send
	// 0-RTT data. If the server Config.Accept0RTTData is true, and the
	// client offered a session ticket valid for that purpose, it will
	// be notified that the 0-RTT data is accepted and it will be made
	// immediately available for Read.
	Offered0RTTData bool

	// AcceptsDelegatedCredential is true if the client indicated willingness
	// to negotiate the delegated credential extension.
	AcceptsDelegatedCredential bool

	// The Fingerprint is an sequence of bytes unique to this Client Hello.
	// It can be used to prevent or mitigate 0-RTT data replays as it's
	// guaranteed that a replayed connection will have the same Fingerprint.
	Fingerprint []byte

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

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.

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, 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.
	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 to be used in
	// TLS 1.0-1.2. 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. 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. 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

	// 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 1.2.
	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

	// If Max0RTTDataSize is not zero, the client will be allowed to use
	// session tickets to send at most this number of bytes of 0-RTT data.
	// 0-RTT data is subject to replay and has memory DoS implications.
	// The server will later be able to refuse the 0-RTT data with
	// Accept0RTTData, or wait for the client to prove that it's not
	// replayed with Conn.ConfirmHandshake.
	// It has no meaning on the client.
	// See https://tools.ietf.org/html/draft-ietf-tls-tls13-18#section-2.3.
	Max0RTTDataSize uint32

	// Accept0RTTData makes the 0-RTT data received from the client
	// immediately available to Read. 0-RTT data is subject to replay.
	// Use Conn.ConfirmHandshake to wait until the data is known not
	// to be replayed after reading it.
	// It has no meaning on the client.
	// See https://tools.ietf.org/html/draft-ietf-tls-tls13-18#section-2.3.
	Accept0RTTData bool

	// SessionTicketSealer, if not nil, is used to wrap and unwrap
	// session tickets, instead of SessionTicketKey.
	SessionTicketSealer SessionTicketSealer

	// AcceptDelegatedCredential is true if the client is willing to negotiate
	// the delegated credential extension.
	// This value has no meaning for the server.
	// See https://tools.ietf.org/html/draft-ietf-tls-subcerts-02.
	AcceptDelegatedCredential bool

	// GetDelegatedCredential returns a DC and its private key for use in the
	// delegated credential extension. The inputs to the callback are some
	// information parsed from the ClientHello, as well as the protocol version
	// selected by the server. This is necessary because the DC is bound to the
	// protocol version in which it's used. The return value is the raw DC
	// encoded in the wire format specified in
	// https://tools.ietf.org/html/draft-ietf-tls-subcerts-02. If the return
	// value is nil, then the server will not offer negotiate the extension.
	// This value has no meaning for the client.
	GetDelegatedCredential func(*ClientHelloInfo, uint16) ([]byte, crypto.PrivateKey, error)

	// GetExtensions, if not nil, is called before a message that allows
	// sending of extensions is sent.
	// Currently only implemented for the ClientHello message (for the client)
	// and for the EncryptedExtensions message (for the server).
	// Only valid for TLS 1.3.
	GetExtensions func(handshakeMessageType uint8) []Extension

	// ReceivedExtensions, if not nil, is called when a message that allows the
	// inclusion of extensions is received.
	// It is called with an empty slice of extensions, if the message didn't
	// contain any extensions.
	// Currently only implemented for the ClientHello message (sent by the
	// client) and for the EncryptedExtensions message (sent by the server).
	// Only valid for TLS 1.3.
	ReceivedExtensions func(handshakeMessageType uint8, exts []Extension) error

	// UseExtendedMasterSecret indicates whether or not the connection
	// should use the extended master secret computation if available
	UseExtendedMasterSecret bool

	// AlternativeRecordLayer is used by QUIC
	AlternativeRecordLayer RecordLayer
	// 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.

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.

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) ConfirmHandshake

func (c *Conn) ConfirmHandshake() error

ConfirmHandshake waits for the handshake to reach a point at which the connection is certainly not replayed. That is, after receiving the Client Finished.

If ConfirmHandshake returns an error and until ConfirmHandshake returns, the 0-RTT data should not be trusted not to be replayed.

This is only meaningful in TLS 1.3 when Accept0RTTData is true and the client sent valid 0-RTT data. In any other case it's equivalent to calling Handshake.

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.

In TLS 1.3 Handshake returns after the client and server first flights, without waiting for the Client Finished.

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 {
	ConnectionID                []byte                // Random unique connection id
	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
	DelegatedCredential         []byte                // Delegated credential sent by the 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

	// HandshakeConfirmed is true once all data returned by Read
	// (past and future) is guaranteed not to be replayed.
	HandshakeConfirmed bool

	// Unique0RTTToken is a value that never repeats, and can be used
	// to detect replay attacks against 0-RTT connections.
	// Unique0RTTToken is only present if HandshakeConfirmed is false.
	Unique0RTTToken []byte

	ClientHello []byte // ClientHello packet

ConnectionState records basic TLS details about the connection.

type CurveID

type CurveID = tls.CurveID

CurveID is tls.CurveID TLS 1.3 refers to these as Groups, but this library implements only curve-based ones anyway. See https://tools.ietf.org/html/draft-ietf-tls-tls13-18#section-4.2.4.

type Extension

type Extension struct {
	Type uint16
	Data []byte

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 RecordLayer

type RecordLayer interface {
	SetReadKey(suite *CipherSuite, trafficSecret []byte)
	SetWriteKey(suite *CipherSuite, trafficSecret []byte)
	ReadHandshakeMessage() ([]byte, error)
	WriteRecord([]byte) (int, error)

type RenegotiationSupport

type RenegotiationSupport = tls.RenegotiationSupport

RenegotiationSupport is a tls.RenegotiationSupport

type SessionTicketSealer

type SessionTicketSealer interface {
	// Seal returns a session ticket value that can be later passed to Unseal
	// to recover the content, usually by encrypting it. The ticket will be sent
	// to the client to be stored, and will be sent back in plaintext, so it can
	// be read and modified by an attacker.
	Seal(cs *ConnectionState, content []byte) (ticket []byte, err error)

	// Unseal returns a session ticket contents. The ticket can't be safely
	// assumed to have been generated by Seal.
	// If unable to unseal the ticket, the connection will proceed with a
	// complete handshake.
	Unseal(chi *ClientHelloInfo, ticket []byte) (content []byte, success bool)

A SessionTicketSealer provides a way to securely encapsulate session state for storage on the client. All methods are safe for concurrent use.

type SignatureScheme

type SignatureScheme = tls.SignatureScheme

SignatureScheme is a tls.SignatureScheme



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