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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package runner
import (
"container/list"
"crypto"
"crypto/ecdsa"
"crypto/rand"
"crypto/x509"
"fmt"
"io"
"math/big"
"strings"
"sync"
"time"
)
const (
VersionSSL30 = 0x0300
VersionTLS10 = 0x0301
VersionTLS11 = 0x0302
VersionTLS12 = 0x0303
VersionTLS13 = 0x0304
)
const (
VersionDTLS10 = 0xfeff
VersionDTLS12 = 0xfefd
)
// A draft version of TLS 1.3 that is sent over the wire for the current draft.
const (
tls13Draft23Version = 0x7f17
)
const (
TLS13Draft23 = 0
)
var allTLSWireVersions = []uint16{
tls13Draft23Version,
VersionTLS12,
VersionTLS11,
VersionTLS10,
VersionSSL30,
}
var allDTLSWireVersions = []uint16{
VersionDTLS12,
VersionDTLS10,
}
const (
maxPlaintext = 16384 // maximum plaintext payload length
maxCiphertext = 16384 + 2048 // maximum ciphertext payload length
tlsRecordHeaderLen = 5 // record header length
dtlsRecordHeaderLen = 13
maxHandshake = 65536 // maximum handshake we support (protocol max is 16 MB)
minVersion = VersionSSL30
maxVersion = VersionTLS13
)
// TLS record types.
type recordType uint8
const (
recordTypeChangeCipherSpec recordType = 20
recordTypeAlert recordType = 21
recordTypeHandshake recordType = 22
recordTypeApplicationData recordType = 23
recordTypePlaintextHandshake recordType = 24
)
// TLS handshake message types.
const (
typeHelloRequest uint8 = 0
typeClientHello uint8 = 1
typeServerHello uint8 = 2
typeHelloVerifyRequest uint8 = 3
typeNewSessionTicket uint8 = 4
typeEndOfEarlyData uint8 = 5 // draft-ietf-tls-tls13-21
typeHelloRetryRequest uint8 = 6 // draft-ietf-tls-tls13-16
typeEncryptedExtensions uint8 = 8 // draft-ietf-tls-tls13-16
typeCertificate uint8 = 11
typeServerKeyExchange uint8 = 12
typeCertificateRequest uint8 = 13
typeServerHelloDone uint8 = 14
typeCertificateVerify uint8 = 15
typeClientKeyExchange uint8 = 16
typeFinished uint8 = 20
typeCertificateStatus uint8 = 22
typeKeyUpdate uint8 = 24 // draft-ietf-tls-tls13-16
typeNextProtocol uint8 = 67 // Not IANA assigned
typeChannelID uint8 = 203 // Not IANA assigned
typeMessageHash uint8 = 254 // draft-ietf-tls-tls13-21
)
// TLS compression types.
const (
compressionNone uint8 = 0
)
// TLS extension numbers
const (
extensionServerName uint16 = 0
extensionStatusRequest uint16 = 5
extensionSupportedCurves uint16 = 10
extensionSupportedPoints uint16 = 11
extensionSignatureAlgorithms uint16 = 13
extensionUseSRTP uint16 = 14
extensionALPN uint16 = 16
extensionSignedCertificateTimestamp uint16 = 18
extensionPadding uint16 = 21
extensionExtendedMasterSecret uint16 = 23
extensionTokenBinding uint16 = 24
extensionQUICTransportParams uint16 = 26
extensionSessionTicket uint16 = 35
extensionPreSharedKey uint16 = 41 // draft-ietf-tls-tls13-16
extensionEarlyData uint16 = 42 // draft-ietf-tls-tls13-16
extensionSupportedVersions uint16 = 43 // draft-ietf-tls-tls13-16
extensionCookie uint16 = 44 // draft-ietf-tls-tls13-16
extensionPSKKeyExchangeModes uint16 = 45 // draft-ietf-tls-tls13-18
extensionTicketEarlyDataInfo uint16 = 46 // draft-ietf-tls-tls13-18
extensionCertificateAuthorities uint16 = 47 // draft-ietf-tls-tls13-21
extensionKeyShare uint16 = 51 // draft-ietf-tls-tls13-23
extensionCustom uint16 = 1234 // not IANA assigned
extensionNextProtoNeg uint16 = 13172 // not IANA assigned
extensionRenegotiationInfo uint16 = 0xff01
extensionChannelID uint16 = 30032 // not IANA assigned
extensionDummyPQPadding uint16 = 54537 // not IANA assigned
)
// TLS signaling cipher suite values
const (
scsvRenegotiation uint16 = 0x00ff
)
var tls13HelloRetryRequest = []uint8{
0xcf, 0x21, 0xad, 0x74, 0xe5, 0x9a, 0x61, 0x11, 0xbe, 0x1d, 0x8c,
0x02, 0x1e, 0x65, 0xb8, 0x91, 0xc2, 0xa2, 0x11, 0x16, 0x7a, 0xbb,
0x8c, 0x5e, 0x07, 0x9e, 0x09, 0xe2, 0xc8, 0xa8, 0x33, 0x9c,
}
// 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
type CurveID uint16
const (
CurveP224 CurveID = 21
CurveP256 CurveID = 23
CurveP384 CurveID = 24
CurveP521 CurveID = 25
CurveX25519 CurveID = 29
)
// TLS Elliptic Curve Point Formats
// http://www.iana.org/assignments/tls-parameters/tls-parameters.xml#tls-parameters-9
const (
pointFormatUncompressed uint8 = 0
pointFormatCompressedPrime uint8 = 1
)
// TLS CertificateStatusType (RFC 3546)
const (
statusTypeOCSP uint8 = 1
)
// Certificate types (for certificateRequestMsg)
const (
CertTypeRSASign = 1 // A certificate containing an RSA key
CertTypeDSSSign = 2 // A certificate containing a DSA key
CertTypeRSAFixedDH = 3 // A certificate containing a static DH key
CertTypeDSSFixedDH = 4 // A certificate containing a static DH key
// See RFC4492 sections 3 and 5.5.
CertTypeECDSASign = 64 // A certificate containing an ECDSA-capable public key, signed with ECDSA.
CertTypeRSAFixedECDH = 65 // A certificate containing an ECDH-capable public key, signed with RSA.
CertTypeECDSAFixedECDH = 66 // A certificate containing an ECDH-capable public key, signed with ECDSA.
// Rest of these are reserved by the TLS spec
)
// signatureAlgorithm corresponds to a SignatureScheme value from TLS 1.3. Note
// that TLS 1.3 names the production 'SignatureScheme' to avoid colliding with
// TLS 1.2's SignatureAlgorithm but otherwise refers to them as 'signature
// algorithms' throughout. We match the latter.
type signatureAlgorithm uint16
const (
// RSASSA-PKCS1-v1_5 algorithms
signatureRSAPKCS1WithMD5 signatureAlgorithm = 0x0101
signatureRSAPKCS1WithSHA1 signatureAlgorithm = 0x0201
signatureRSAPKCS1WithSHA256 signatureAlgorithm = 0x0401
signatureRSAPKCS1WithSHA384 signatureAlgorithm = 0x0501
signatureRSAPKCS1WithSHA512 signatureAlgorithm = 0x0601
// ECDSA algorithms
signatureECDSAWithSHA1 signatureAlgorithm = 0x0203
signatureECDSAWithP256AndSHA256 signatureAlgorithm = 0x0403
signatureECDSAWithP384AndSHA384 signatureAlgorithm = 0x0503
signatureECDSAWithP521AndSHA512 signatureAlgorithm = 0x0603
// RSASSA-PSS algorithms
signatureRSAPSSWithSHA256 signatureAlgorithm = 0x0804
signatureRSAPSSWithSHA384 signatureAlgorithm = 0x0805
signatureRSAPSSWithSHA512 signatureAlgorithm = 0x0806
// EdDSA algorithms
signatureEd25519 signatureAlgorithm = 0x0807
signatureEd448 signatureAlgorithm = 0x0808
)
// supportedSignatureAlgorithms contains the default supported signature
// algorithms.
var supportedSignatureAlgorithms = []signatureAlgorithm{
signatureRSAPSSWithSHA256,
signatureRSAPKCS1WithSHA256,
signatureECDSAWithP256AndSHA256,
signatureRSAPKCS1WithSHA1,
signatureECDSAWithSHA1,
signatureEd25519,
}
// SRTP protection profiles (See RFC 5764, section 4.1.2)
const (
SRTP_AES128_CM_HMAC_SHA1_80 uint16 = 0x0001
SRTP_AES128_CM_HMAC_SHA1_32 = 0x0002
)
// PskKeyExchangeMode values (see draft-ietf-tls-tls13-16)
const (
pskKEMode = 0
pskDHEKEMode = 1
)
// KeyUpdateRequest values (see draft-ietf-tls-tls13-16, section 4.5.3)
const (
keyUpdateNotRequested = 0
keyUpdateRequested = 1
)
// ConnectionState records basic TLS details about the connection.
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 (from Config.NextProtos)
NegotiatedProtocolIsMutual bool // negotiated protocol was advertised by server
NegotiatedProtocolFromALPN bool // protocol negotiated with ALPN
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
ChannelID *ecdsa.PublicKey // the channel ID for this connection
TokenBindingNegotiated bool // whether Token Binding was negotiated
TokenBindingParam uint8 // the negotiated Token Binding key parameter
SRTPProtectionProfile uint16 // the negotiated DTLS-SRTP protection profile
TLSUnique []byte // the tls-unique channel binding
SCTList []byte // signed certificate timestamp list
PeerSignatureAlgorithm signatureAlgorithm // algorithm used by the peer in the handshake
CurveID CurveID // the curve used in ECDHE
QUICTransportParams []byte // the QUIC transport params received from the peer
}
// ClientAuthType declares the policy the server will follow for
// TLS Client Authentication.
type ClientAuthType int
const (
NoClientCert ClientAuthType = iota
RequestClientCert
RequireAnyClientCert
VerifyClientCertIfGiven
RequireAndVerifyClientCert
)
// ClientSessionState contains the state needed by clients to resume TLS
// sessions.
type ClientSessionState struct {
sessionId []uint8 // Session ID supplied by the server. nil if the session has a ticket.
sessionTicket []uint8 // Encrypted ticket used for session resumption with server
vers uint16 // SSL/TLS version negotiated for the session
wireVersion uint16 // Wire SSL/TLS version negotiated for the session
cipherSuite uint16 // Ciphersuite negotiated for the session
masterSecret []byte // MasterSecret generated by client on a full handshake
handshakeHash []byte // Handshake hash for Channel ID purposes.
serverCertificates []*x509.Certificate // Certificate chain presented by the server
extendedMasterSecret bool // Whether an extended master secret was used to generate the session
sctList []byte
ocspResponse []byte
earlyALPN string
ticketCreationTime time.Time
ticketExpiration time.Time
ticketAgeAdd uint32
maxEarlyDataSize uint32
}
// 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.
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)
}
// ServerSessionCache is a cache of sessionState objects that can be used by a
// client to resume a TLS session with a given server. ServerSessionCache
// implementations should expect to be called concurrently from different
// goroutines.
type ServerSessionCache interface {
// Get searches for a sessionState associated with the given session
// ID. On return, ok is true if one was found.
Get(sessionId string) (session *sessionState, ok bool)
// Put adds the sessionState to the cache with the given session ID.
Put(sessionId string, session *sessionState)
}
// 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.
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.
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
// 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.
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
// ClientCertificateTypes defines the set of allowed client certificate
// types. The default is CertTypeRSASign and CertTypeECDSASign.
ClientCertificateTypes []byte
// 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
// ClientSessionCache is a cache of ClientSessionState entries
// for TLS session resumption.
ClientSessionCache ClientSessionCache
// ServerSessionCache is a cache of sessionState entries for TLS session
// resumption.
ServerSessionCache ServerSessionCache
// MinVersion contains the minimum SSL/TLS version that is acceptable.
// If zero, then SSLv3 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
// TLS13Variant is the variant of TLS 1.3 to use.
TLS13Variant int
// 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
// DefaultCurves contains the elliptic curves for which public values will
// be sent in the ClientHello's KeyShare extension. If this value is nil,
// all supported curves will have public values sent. This field is ignored
// on servers.
DefaultCurves []CurveID
// ChannelID contains the ECDSA key for the client to use as
// its TLS Channel ID.
ChannelID *ecdsa.PrivateKey
// RequestChannelID controls whether the server requests a TLS
// Channel ID. If negotiated, the client's public key is
// returned in the ConnectionState.
RequestChannelID bool
// TokenBindingParams contains a list of TokenBindingKeyParameters
// (draft-ietf-tokbind-protocol-16) to attempt to negotiate. If
// nil, Token Binding will not be negotiated.
TokenBindingParams []byte
// TokenBindingVersion contains the serialized ProtocolVersion to
// use when negotiating Token Binding.
TokenBindingVersion uint16
// ExpectTokenBindingParams is checked by a server that the client
// sent ExpectTokenBindingParams as its list of Token Binding
// paramters.
ExpectTokenBindingParams []byte
// PreSharedKey, if not nil, is the pre-shared key to use with
// the PSK cipher suites.
PreSharedKey []byte
// PreSharedKeyIdentity, if not empty, is the identity to use
// with the PSK cipher suites.
PreSharedKeyIdentity string
// MaxEarlyDataSize controls the maximum number of bytes that the
// server will accept in early data and advertise in a
// NewSessionTicketMsg. If 0, no early data will be accepted and
// the early_data extension in the NewSessionTicketMsg will be omitted.
MaxEarlyDataSize uint32
// SRTPProtectionProfiles, if not nil, is the list of SRTP
// protection profiles to offer in DTLS-SRTP.
SRTPProtectionProfiles []uint16
// SignSignatureAlgorithms, if not nil, overrides the default set of
// supported signature algorithms to sign with.
SignSignatureAlgorithms []signatureAlgorithm
// VerifySignatureAlgorithms, if not nil, overrides the default set of
// supported signature algorithms that are accepted.
VerifySignatureAlgorithms []signatureAlgorithm
// QUICTransportParams, if not empty, will be sent in the QUIC
// transport parameters extension.
QUICTransportParams []byte
// Bugs specifies optional misbehaviour to be used for testing other
// implementations.
Bugs ProtocolBugs
serverInitOnce sync.Once // guards calling (*Config).serverInit
}
type BadValue int
const (
BadValueNone BadValue = iota
BadValueNegative
BadValueZero
BadValueLimit
BadValueLarge
NumBadValues
)
type RSABadValue int
const (
RSABadValueNone RSABadValue = iota
RSABadValueCorrupt
RSABadValueTooLong
RSABadValueTooShort
RSABadValueWrongVersion1
RSABadValueWrongVersion2
RSABadValueWrongBlockType
RSABadValueWrongLeadingByte
RSABadValueNoZero
NumRSABadValues
)
type ProtocolBugs struct {
// InvalidSignature specifies that the signature in a ServerKeyExchange
// or CertificateVerify message should be invalid.
InvalidSignature bool
// SendCurve, if non-zero, causes the server to send the specified curve
// ID in ServerKeyExchange (TLS 1.2) or ServerHello (TLS 1.3) rather
// than the negotiated one.
SendCurve CurveID
// InvalidECDHPoint, if true, causes the ECC points in
// ServerKeyExchange or ClientKeyExchange messages to be invalid.
InvalidECDHPoint bool
// BadECDSAR controls ways in which the 'r' value of an ECDSA signature
// can be invalid.
BadECDSAR BadValue
BadECDSAS BadValue
// MaxPadding causes CBC records to have the maximum possible padding.
MaxPadding bool
// PaddingFirstByteBad causes the first byte of the padding to be
// incorrect.
PaddingFirstByteBad bool
// PaddingFirstByteBadIf255 causes the first byte of padding to be
// incorrect if there's a maximum amount of padding (i.e. 255 bytes).
PaddingFirstByteBadIf255 bool
// FailIfNotFallbackSCSV causes a server handshake to fail if the
// client doesn't send the fallback SCSV value.
FailIfNotFallbackSCSV bool
// DuplicateExtension causes an extra empty extension of bogus type to
// be emitted in either the ClientHello or the ServerHello.
DuplicateExtension bool
// UnauthenticatedECDH causes the server to pretend ECDHE_RSA
// and ECDHE_ECDSA cipher suites are actually ECDH_anon. No
// Certificate message is sent and no signature is added to
// ServerKeyExchange.
UnauthenticatedECDH bool
// SkipHelloVerifyRequest causes a DTLS server to skip the
// HelloVerifyRequest message.
SkipHelloVerifyRequest bool
// SkipCertificateStatus, if true, causes the server to skip the
// CertificateStatus message. This is legal because CertificateStatus is
// optional, even with a status_request in ServerHello.
SkipCertificateStatus bool
// SkipServerKeyExchange causes the server to skip sending
// ServerKeyExchange messages.
SkipServerKeyExchange bool
// SkipNewSessionTicket causes the server to skip sending the
// NewSessionTicket message despite promising to in ServerHello.
SkipNewSessionTicket bool
// UseFirstSessionTicket causes the client to cache only the first session
// ticket received.
UseFirstSessionTicket bool
// SkipClientCertificate causes the client to skip the Certificate
// message.
SkipClientCertificate bool
// SkipChangeCipherSpec causes the implementation to skip
// sending the ChangeCipherSpec message (and adjusting cipher
// state accordingly for the Finished message).
SkipChangeCipherSpec bool
// SkipFinished causes the implementation to skip sending the Finished
// message.
SkipFinished bool
// SkipEndOfEarlyData causes the implementation to skip
// end_of_early_data.
SkipEndOfEarlyData bool
// NonEmptyEndOfEarlyData causes the implementation to end an extra byte in the
// EndOfEarlyData.
NonEmptyEndOfEarlyData bool
// SkipCertificateVerify, if true causes peer to skip sending a
// CertificateVerify message after the Certificate message.
SkipCertificateVerify bool
// EarlyChangeCipherSpec causes the client to send an early
// ChangeCipherSpec message before the ClientKeyExchange. A value of
// zero disables this behavior. One and two configure variants for
// 1.0.1 and 0.9.8 modes, respectively.
EarlyChangeCipherSpec int
// StrayChangeCipherSpec causes every pre-ChangeCipherSpec handshake
// message in DTLS to be prefaced by stray ChangeCipherSpec record. This
// may be used to test DTLS's handling of reordered ChangeCipherSpec.
StrayChangeCipherSpec bool
// ReorderChangeCipherSpec causes the ChangeCipherSpec message to be
// sent at start of each flight in DTLS. Unlike EarlyChangeCipherSpec,
// the cipher change happens at the usual time.
ReorderChangeCipherSpec bool
// FragmentAcrossChangeCipherSpec causes the implementation to fragment
// the Finished (or NextProto) message around the ChangeCipherSpec
// messages.
FragmentAcrossChangeCipherSpec bool
// SendExtraChangeCipherSpec causes the implementation to send extra
// ChangeCipherSpec messages.
SendExtraChangeCipherSpec int
// SendPostHandshakeChangeCipherSpec causes the implementation to send
// a ChangeCipherSpec record before every application data record.
SendPostHandshakeChangeCipherSpec bool
// SendUnencryptedFinished, if true, causes the Finished message to be
// send unencrypted before ChangeCipherSpec rather than after it.
SendUnencryptedFinished bool
// PartialEncryptedExtensionsWithServerHello, if true, causes the TLS
// 1.3 server to send part of EncryptedExtensions unencrypted
// in the same record as ServerHello.
PartialEncryptedExtensionsWithServerHello bool
// PartialClientFinishedWithClientHello, if true, causes the TLS 1.3
// client to send part of Finished unencrypted in the same record as
// ClientHello.
PartialClientFinishedWithClientHello bool
// SendV2ClientHello causes the client to send a V2ClientHello
// instead of a normal ClientHello.
SendV2ClientHello bool
// SendFallbackSCSV causes the client to include
// TLS_FALLBACK_SCSV in the ClientHello.
SendFallbackSCSV bool
// SendRenegotiationSCSV causes the client to include the renegotiation
// SCSV in the ClientHello.
SendRenegotiationSCSV bool
// MaxHandshakeRecordLength, if non-zero, is the maximum size of a
// handshake record. Handshake messages will be split into multiple
// records at the specified size, except that the client_version will
// never be fragmented. For DTLS, it is the maximum handshake fragment
// size, not record size; DTLS allows multiple handshake fragments in a
// single handshake record. See |PackHandshakeFragments|.
MaxHandshakeRecordLength int
// FragmentClientVersion will allow MaxHandshakeRecordLength to apply to
// the first 6 bytes of the ClientHello.
FragmentClientVersion bool
// FragmentAlert will cause all alerts to be fragmented across
// two records.
FragmentAlert bool
// DoubleAlert will cause all alerts to be sent as two copies packed
// within one record.
DoubleAlert bool
// SendSpuriousAlert, if non-zero, will cause an spurious, unwanted
// alert to be sent.
SendSpuriousAlert alert
// BadRSAClientKeyExchange causes the client to send a corrupted RSA
// ClientKeyExchange which would not pass padding checks.
BadRSAClientKeyExchange RSABadValue
// RenewTicketOnResume causes the server to renew the session ticket and
// send a NewSessionTicket message during an abbreviated handshake.
RenewTicketOnResume bool
// SendClientVersion, if non-zero, causes the client to send the
// specified value in the ClientHello version field.
SendClientVersion uint16
// OmitSupportedVersions, if true, causes the client to omit the
// supported versions extension.
OmitSupportedVersions bool
// SendSupportedVersions, if non-empty, causes the client to send a
// supported versions extension with the values from array.
SendSupportedVersions []uint16
// NegotiateVersion, if non-zero, causes the server to negotiate the
// specifed wire version rather than the version supported by either
// peer.
NegotiateVersion uint16
// NegotiateVersionOnRenego, if non-zero, causes the server to negotiate
// the specified wire version on renegotiation rather than retaining it.
NegotiateVersionOnRenego uint16
// ExpectFalseStart causes the server to, on full handshakes,
// expect the peer to False Start; the server Finished message
// isn't sent until we receive an application data record
// from the peer.
ExpectFalseStart bool
// AlertBeforeFalseStartTest, if non-zero, causes the server to, on full
// handshakes, send an alert just before reading the application data
// record to test False Start. This can be used in a negative False
// Start test to determine whether the peer processed the alert (and
// closed the connection) before or after sending app data.
AlertBeforeFalseStartTest alert
// ExpectServerName, if not empty, is the hostname the client
// must specify in the server_name extension.
ExpectServerName string
// SwapNPNAndALPN switches the relative order between NPN and ALPN in
// both ClientHello and ServerHello.
SwapNPNAndALPN bool
// ALPNProtocol, if not nil, sets the ALPN protocol that a server will
// return.
ALPNProtocol *string
// AcceptAnySession causes the server to resume sessions regardless of
// the version associated with the session or cipher suite. It also
// causes the server to look in both TLS 1.2 and 1.3 extensions to
// process a ticket.
AcceptAnySession bool
// SendBothTickets, if true, causes the client to send tickets in both
// TLS 1.2 and 1.3 extensions.
SendBothTickets bool
// FilterTicket, if not nil, causes the client to modify a session
// ticket before sending it in a resume handshake.
FilterTicket func([]byte) ([]byte, error)
// TicketSessionIDLength, if non-zero, is the length of the session ID
// to send with a ticket resumption offer.
TicketSessionIDLength int
// EmptyTicketSessionID, if true, causes the client to send an empty
// session ID with a ticket resumption offer. For simplicity, this will
// also cause the client to interpret a ServerHello with empty session
// ID as a resumption. (A client which sends empty session ID is
// normally expected to look ahead for ChangeCipherSpec.)
EmptyTicketSessionID bool
// SendClientHelloSessionID, if not nil, is the session ID sent in the
// ClientHello.
SendClientHelloSessionID []byte
// ExpectClientHelloSessionID, if true, causes the server to fail the
// connection if there is not a session ID in the ClientHello.
ExpectClientHelloSessionID bool
// EchoSessionIDInFullHandshake, if true, causes the server to echo the
// ClientHello session ID, even in TLS 1.2 full handshakes.
EchoSessionIDInFullHandshake bool
// ExpectNoTLS12Session, if true, causes the server to fail the
// connection if either a session ID or TLS 1.2 ticket is offered.
ExpectNoTLS12Session bool
// ExpectNoTLS13PSK, if true, causes the server to fail the connection
// if a TLS 1.3 PSK is offered.
ExpectNoTLS13PSK bool
// ExpectNoTLS13PSKAfterHRR, if true, causes the server to fail the connection
// if a TLS 1.3 PSK is offered after HRR.
ExpectNoTLS13PSKAfterHRR bool
// RequireExtendedMasterSecret, if true, requires that the peer support
// the extended master secret option.
RequireExtendedMasterSecret bool
// NoExtendedMasterSecret causes the client and server to behave as if
// they didn't support an extended master secret in the initial
// handshake.
NoExtendedMasterSecret bool
// NoExtendedMasterSecretOnRenegotiation causes the client and server to
// behave as if they didn't support an extended master secret in
// renegotiation handshakes.
NoExtendedMasterSecretOnRenegotiation bool
// EmptyRenegotiationInfo causes the renegotiation extension to be
// empty in a renegotiation handshake.
EmptyRenegotiationInfo bool
// BadRenegotiationInfo causes the renegotiation extension value in a
// renegotiation handshake to be incorrect at the start.
BadRenegotiationInfo bool
// BadRenegotiationInfoEnd causes the renegotiation extension value in
// a renegotiation handshake to be incorrect at the end.
BadRenegotiationInfoEnd bool
// NoRenegotiationInfo disables renegotiation info support in all
// handshakes.
NoRenegotiationInfo bool
// NoRenegotiationInfoInInitial disables renegotiation info support in
// the initial handshake.
NoRenegotiationInfoInInitial bool
// NoRenegotiationInfoAfterInitial disables renegotiation info support
// in renegotiation handshakes.
NoRenegotiationInfoAfterInitial bool
// RequireRenegotiationInfo, if true, causes the client to return an
// error if the server doesn't reply with the renegotiation extension.
RequireRenegotiationInfo bool
// SequenceNumberMapping, if non-nil, is the mapping function to apply
// to the sequence number of outgoing packets. For both TLS and DTLS,
// the two most-significant bytes in the resulting sequence number are
// ignored so that the DTLS epoch cannot be changed.
SequenceNumberMapping func(uint64) uint64
// RSAEphemeralKey, if true, causes the server to send a
// ServerKeyExchange message containing an ephemeral key (as in
// RSA_EXPORT) in the plain RSA key exchange.
RSAEphemeralKey bool
// SRTPMasterKeyIdentifer, if not empty, is the SRTP MKI value that the
// client offers when negotiating SRTP. MKI support is still missing so
// the peer must still send none.
SRTPMasterKeyIdentifer string
// SendSRTPProtectionProfile, if non-zero, is the SRTP profile that the
// server sends in the ServerHello instead of the negotiated one.
SendSRTPProtectionProfile uint16
// NoSignatureAlgorithms, if true, causes the client to omit the
// signature and hashes extension.
//
// For a server, it will cause an empty list to be sent in the
// CertificateRequest message. None the less, the configured set will
// still be enforced.
NoSignatureAlgorithms bool
// NoSupportedCurves, if true, causes the client to omit the
// supported_curves extension.
NoSupportedCurves bool
// RequireSameRenegoClientVersion, if true, causes the server
// to require that all ClientHellos match in offered version
// across a renego.
RequireSameRenegoClientVersion bool
// ExpectInitialRecordVersion, if non-zero, is the expected value of
// record-layer version field before the protocol version is determined.
ExpectInitialRecordVersion uint16
// SendRecordVersion, if non-zero, is the value to send as the
// record-layer version.
SendRecordVersion uint16
// SendInitialRecordVersion, if non-zero, is the value to send as the
// record-layer version before the protocol version is determined.
SendInitialRecordVersion uint16
// MaxPacketLength, if non-zero, is the maximum acceptable size for a
// packet.
MaxPacketLength int
// SendCipherSuite, if non-zero, is the cipher suite value that the
// server will send in the ServerHello. This does not affect the cipher
// the server believes it has actually negotiated.
SendCipherSuite uint16
// SendCipherSuites, if not nil, is the cipher suite list that the
// client will send in the ClientHello. This does not affect the cipher
// the client believes it has actually offered.
SendCipherSuites []uint16
// AppDataBeforeHandshake, if not nil, causes application data to be
// sent immediately before the first handshake message.
AppDataBeforeHandshake []byte
// AppDataAfterChangeCipherSpec, if not nil, causes application data to
// be sent immediately after ChangeCipherSpec.
AppDataAfterChangeCipherSpec []byte
// AlertAfterChangeCipherSpec, if non-zero, causes an alert to be sent
// immediately after ChangeCipherSpec.
AlertAfterChangeCipherSpec alert
// TimeoutSchedule is the schedule of packet drops and simulated
// timeouts for before each handshake leg from the peer.
TimeoutSchedule []time.Duration
// PacketAdaptor is the packetAdaptor to use to simulate timeouts.
PacketAdaptor *packetAdaptor
// ReorderHandshakeFragments, if true, causes handshake fragments in
// DTLS to overlap and be sent in the wrong order. It also causes
// pre-CCS flights to be sent twice. (Post-CCS flights consist of
// Finished and will trigger a spurious retransmit.)
ReorderHandshakeFragments bool
// ReverseHandshakeFragments, if true, causes handshake fragments in
// DTLS to be reversed within a flight.
ReverseHandshakeFragments bool
// MixCompleteMessageWithFragments, if true, causes handshake
// messages in DTLS to redundantly both fragment the message
// and include a copy of the full one.
MixCompleteMessageWithFragments bool
// RetransmitFinished, if true, causes the DTLS Finished message to be
// sent twice.
RetransmitFinished bool
// SendInvalidRecordType, if true, causes a record with an invalid
// content type to be sent immediately following the handshake.
SendInvalidRecordType bool
// SendWrongMessageType, if non-zero, causes messages of the specified
// type to be sent with the wrong value.
SendWrongMessageType byte
// SendTrailingMessageData, if non-zero, causes messages of the
// specified type to be sent with trailing data.
SendTrailingMessageData byte
// FragmentMessageTypeMismatch, if true, causes all non-initial
// handshake fragments in DTLS to have the wrong message type.
FragmentMessageTypeMismatch bool
// FragmentMessageLengthMismatch, if true, causes all non-initial
// handshake fragments in DTLS to have the wrong message length.
FragmentMessageLengthMismatch bool
// SplitFragments, if non-zero, causes the handshake fragments in DTLS
// to be split across two records. The value of |SplitFragments| is the
// number of bytes in the first fragment.
SplitFragments int
// SendEmptyFragments, if true, causes handshakes to include empty
// fragments in DTLS.
SendEmptyFragments bool
// SendSplitAlert, if true, causes an alert to be sent with the header
// and record body split across multiple packets. The peer should
// discard these packets rather than process it.
SendSplitAlert bool
// FailIfResumeOnRenego, if true, causes renegotiations to fail if the
// client offers a resumption or the server accepts one.
FailIfResumeOnRenego bool
// IgnorePeerCipherPreferences, if true, causes the peer's cipher
// preferences to be ignored.
IgnorePeerCipherPreferences bool
// IgnorePeerSignatureAlgorithmPreferences, if true, causes the peer's
// signature algorithm preferences to be ignored.
IgnorePeerSignatureAlgorithmPreferences bool
// IgnorePeerCurvePreferences, if true, causes the peer's curve
// preferences to be ignored.
IgnorePeerCurvePreferences bool
// BadFinished, if true, causes the Finished hash to be broken.
BadFinished bool
// PackHandshakeFragments, if true, causes handshake fragments in DTLS
// to be packed into individual handshake records, up to the specified
// record size.
PackHandshakeFragments int
// PackHandshakeRecords, if non-zero, causes handshake and
// ChangeCipherSpec records in DTLS to be packed into individual
// packets, up to the specified packet size.
PackHandshakeRecords int
// PackAppDataWithHandshake, if true, extends PackHandshakeRecords to
// additionally include the first application data record sent after the
// final Finished message in a handshake. (If the final Finished message
// is sent by the peer, this option has no effect.) This requires that
// the runner rather than shim speak first in a given test.
PackAppDataWithHandshake bool
// SplitAndPackAppData, if true, causes application data in DTLS to be
// split into two records each and packed into one packet.
SplitAndPackAppData bool
// PackHandshakeFlight, if true, causes each handshake flight in TLS to
// be packed into records, up to the largest size record available.
PackHandshakeFlight bool
// AdvertiseAllConfiguredCiphers, if true, causes the client to
// advertise all configured cipher suite values.
AdvertiseAllConfiguredCiphers bool
// EmptyCertificateList, if true, causes the server to send an empty
// certificate list in the Certificate message.
EmptyCertificateList bool
// ExpectNewTicket, if true, causes the client to abort if it does not
// receive a new ticket.
ExpectNewTicket bool
// RequireClientHelloSize, if not zero, is the required length in bytes
// of the ClientHello /record/. This is checked by the server.
RequireClientHelloSize int
// CustomExtension, if not empty, contains the contents of an extension
// that will be added to client/server hellos.
CustomExtension string
// CustomUnencryptedExtension, if not empty, contains the contents of
// an extension that will be added to ServerHello in TLS 1.3.
CustomUnencryptedExtension string
// ExpectedCustomExtension, if not nil, contains the expected contents
// of a custom extension.
ExpectedCustomExtension *string
// CustomTicketExtension, if not empty, contains the contents of an
// extension what will be added to NewSessionTicket in TLS 1.3.
CustomTicketExtension string
// CustomTicketExtension, if not empty, contains the contents of an
// extension what will be added to HelloRetryRequest in TLS 1.3.
CustomHelloRetryRequestExtension string
// NoCloseNotify, if true, causes the close_notify alert to be skipped
// on connection shutdown.
NoCloseNotify bool
// SendAlertOnShutdown, if non-zero, is the alert to send instead of
// close_notify on shutdown.
SendAlertOnShutdown alert
// ExpectCloseNotify, if true, requires a close_notify from the peer on
// shutdown. Records from the peer received after close_notify is sent
// are not discard.
ExpectCloseNotify bool
// SendLargeRecords, if true, allows outgoing records to be sent
// arbitrarily large.
SendLargeRecords bool
// NegotiateALPNAndNPN, if true, causes the server to negotiate both
// ALPN and NPN in the same connetion.
NegotiateALPNAndNPN bool
// SendALPN, if non-empty, causes the server to send the specified
// string in the ALPN extension regardless of the content or presence of
// the client offer.
SendALPN string
// SendUnencryptedALPN, if non-empty, causes the server to send the
// specified string in a ServerHello ALPN extension in TLS 1.3.
SendUnencryptedALPN string
// SendEmptySessionTicket, if true, causes the server to send an empty
// session ticket.
SendEmptySessionTicket bool
// SendPSKKeyExchangeModes, if present, determines the PSK key exchange modes
// to send.
SendPSKKeyExchangeModes []byte
// ExpectNoNewSessionTicket, if present, means that the client will fail upon
// receipt of a NewSessionTicket message.
ExpectNoNewSessionTicket bool
// DuplicateTicketEarlyData causes an extra empty extension of early_data to
// be sent in NewSessionTicket.
DuplicateTicketEarlyData bool
// ExpectTicketEarlyData, if true, means that the client will fail upon
// absence of the early_data extension.
ExpectTicketEarlyData bool
// ExpectTicketAge, if non-zero, is the expected age of the ticket that the
// server receives from the client.
ExpectTicketAge time.Duration
// SendTicketAge, if non-zero, is the ticket age to be sent by the
// client.
SendTicketAge time.Duration
// FailIfSessionOffered, if true, causes the server to fail any
// connections where the client offers a non-empty session ID or session
// ticket.
FailIfSessionOffered bool
// SendHelloRequestBeforeEveryAppDataRecord, if true, causes a
// HelloRequest handshake message to be sent before each application
// data record. This only makes sense for a server.
SendHelloRequestBeforeEveryAppDataRecord bool
// SendHelloRequestBeforeEveryHandshakeMessage, if true, causes a
// HelloRequest handshake message to be sent before each handshake
// message. This only makes sense for a server.
SendHelloRequestBeforeEveryHandshakeMessage bool
// BadChangeCipherSpec, if not nil, is the body to be sent in
// ChangeCipherSpec records instead of {1}.
BadChangeCipherSpec []byte
// BadHelloRequest, if not nil, is what to send instead of a
// HelloRequest.
BadHelloRequest []byte
// RequireSessionTickets, if true, causes the client to require new
// sessions use session tickets instead of session IDs.
RequireSessionTickets bool
// NullAllCiphers, if true, causes every cipher to behave like the null
// cipher.
NullAllCiphers bool
// SendSCTListOnResume, if not nil, causes the server to send the
// supplied SCT list in resumption handshakes.
SendSCTListOnResume []byte
// SendSCTListOnRenegotiation, if not nil, causes the server to send the
// supplied SCT list on renegotiation.
SendSCTListOnRenegotiation []byte
// SendOCSPResponseOnResume, if not nil, causes the server to advertise
// OCSP stapling in resumption handshakes and, if applicable, send the
// supplied stapled response.
SendOCSPResponseOnResume []byte
// SendOCSPResponseOnResume, if not nil, causes the server to send the
// supplied OCSP response on renegotiation.
SendOCSPResponseOnRenegotiation []byte
// SendExtensionOnCertificate, if not nil, causes the runner to send the
// supplied bytes in the extensions on the Certificate message.
SendExtensionOnCertificate []byte
// SendOCSPOnIntermediates, if not nil, causes the server to send the
// supplied OCSP on intermediate certificates in the Certificate message.
SendOCSPOnIntermediates []byte
// SendSCTOnIntermediates, if not nil, causes the server to send the
// supplied SCT on intermediate certificates in the Certificate message.
SendSCTOnIntermediates []byte
// SendDuplicateCertExtensions, if true, causes the server to send an extra
// copy of the OCSP/SCT extensions in the Certificate message.
SendDuplicateCertExtensions bool
// ExpectNoExtensionsOnIntermediate, if true, causes the client to
// reject extensions on intermediate certificates.
ExpectNoExtensionsOnIntermediate bool
// RecordPadding is the number of bytes of padding to add to each
// encrypted record in TLS 1.3.
RecordPadding int
// OmitRecordContents, if true, causes encrypted records in TLS 1.3 to
// be missing their body and content type. Padding, if configured, is
// still added.
OmitRecordContents bool
// OuterRecordType, if non-zero, is the outer record type to use instead
// of application data.
OuterRecordType recordType
// SendSignatureAlgorithm, if non-zero, causes all signatures to be sent
// with the given signature algorithm rather than the one negotiated.
SendSignatureAlgorithm signatureAlgorithm
// SkipECDSACurveCheck, if true, causes all ECDSA curve checks to be
// skipped.
SkipECDSACurveCheck bool
// IgnoreSignatureVersionChecks, if true, causes all signature
// algorithms to be enabled at all TLS versions.
IgnoreSignatureVersionChecks bool
// NegotiateRenegotiationInfoAtAllVersions, if true, causes
// Renegotiation Info to be negotiated at all versions.
NegotiateRenegotiationInfoAtAllVersions bool
// NegotiateNPNAtAllVersions, if true, causes NPN to be negotiated at
// all versions.
NegotiateNPNAtAllVersions bool
// NegotiateEMSAtAllVersions, if true, causes EMS to be negotiated at
// all versions.
NegotiateEMSAtAllVersions bool
// AdvertiseTicketExtension, if true, causes the ticket extension to be
// advertised in server extensions
AdvertiseTicketExtension bool
// NegotiatePSKResumption, if true, causes the server to attempt pure PSK
// resumption.
NegotiatePSKResumption bool
// AlwaysSelectPSKIdentity, if true, causes the server in TLS 1.3 to
// always acknowledge a session, regardless of one was offered.
AlwaysSelectPSKIdentity bool
// SelectPSKIdentityOnResume, if non-zero, causes the server to select
// the specified PSK identity index rather than the actual value.
SelectPSKIdentityOnResume uint16
// ExtraPSKIdentity, if true, causes the client to send an extra PSK
// identity.
ExtraPSKIdentity bool
// MissingKeyShare, if true, causes the TLS 1.3 implementation to skip
// sending a key_share extension and use the zero ECDHE secret
// instead.
MissingKeyShare bool
// SecondClientHelloMissingKeyShare, if true, causes the second TLS 1.3
// ClientHello to skip sending a key_share extension and use the zero
// ECDHE secret instead.
SecondClientHelloMissingKeyShare bool
// MisinterpretHelloRetryRequestCurve, if non-zero, causes the TLS 1.3
// client to pretend the server requested a HelloRetryRequest with the
// given curve rather than the actual one.
MisinterpretHelloRetryRequestCurve CurveID
// DuplicateKeyShares, if true, causes the TLS 1.3 client to send two
// copies of each KeyShareEntry.
DuplicateKeyShares bool
// SendEarlyAlert, if true, sends a fatal alert after the ClientHello.
SendEarlyAlert bool
// SendFakeEarlyDataLength, if non-zero, is the amount of early data to
// send after the ClientHello.
SendFakeEarlyDataLength int
// SendStrayEarlyHandshake, if non-zero, causes the client to send a stray
// handshake record before sending end of early data.
SendStrayEarlyHandshake bool
// OmitEarlyDataExtension, if true, causes the early data extension to
// be omitted in the ClientHello.
OmitEarlyDataExtension bool
// SendEarlyDataOnSecondClientHello, if true, causes the TLS 1.3 client to
// send early data after the second ClientHello.
SendEarlyDataOnSecondClientHello bool
// InterleaveEarlyData, if true, causes the TLS 1.3 client to send early
// data interleaved with the second ClientHello and the client Finished.
InterleaveEarlyData bool
// SendEarlyData causes a TLS 1.3 client to send the provided data
// in application data records immediately after the ClientHello,
// provided that the client offers a TLS 1.3 session. It will do this
// whether or not the server advertised early data for the ticket.
SendEarlyData [][]byte
// ExpectEarlyDataAccepted causes a TLS 1.3 client to check that early data
// was accepted by the server.
ExpectEarlyDataAccepted bool
// AlwaysAcceptEarlyData causes a TLS 1.3 server to always accept early data
// regardless of ALPN mismatch.
AlwaysAcceptEarlyData bool
// AlwaysRejectEarlyData causes a TLS 1.3 server to always reject early data.
AlwaysRejectEarlyData bool
// SendEarlyDataExtension, if true, causes a TLS 1.3 server to send the
// early_data extension in EncryptedExtensions, independent of whether
// it was accepted.
SendEarlyDataExtension bool
// ExpectEarlyKeyingMaterial, if non-zero, causes a TLS 1.3 server to
// read an application data record after the ClientHello before it sends
// a ServerHello. The record's contents have the specified length and
// match the corresponding early exporter value. This is used to test
// the client using the early exporter in the 0-RTT state.
ExpectEarlyKeyingMaterial int
// ExpectEarlyKeyingLabel is the label to use with
// ExpectEarlyKeyingMaterial.
ExpectEarlyKeyingLabel string
// ExpectEarlyKeyingContext is the context string to use with
// ExpectEarlyKeyingMaterial
ExpectEarlyKeyingContext string
// ExpectEarlyData causes a TLS 1.3 server to read application
// data after the ClientHello (assuming the server is able to
// derive the key under which the data is encrypted) before it
// sends a ServerHello. It checks that the application data it
// reads matches what is provided in ExpectEarlyData and errors if
// the number of records or their content do not match.
ExpectEarlyData [][]byte
// ExpectLateEarlyData causes a TLS 1.3 server to read application
// data after the ServerFinished (assuming the server is able to
// derive the key under which the data is encrypted) before it
// sends the ClientFinished. It checks that the application data it
// reads matches what is provided in ExpectLateEarlyData and errors if
// the number of records or their content do not match.
ExpectLateEarlyData [][]byte
// SendHalfRTTData causes a TLS 1.3 server to send the provided
// data in application data records before reading the client's
// Finished message.
SendHalfRTTData [][]byte
// ExpectHalfRTTData causes a TLS 1.3 client, if 0-RTT was accepted, to
// read application data after reading the server's Finished message and
// before sending any subsequent handshake messages. It checks that the
// application data it reads matches what is provided in
// ExpectHalfRTTData and errors if the number of records or their
// content do not match.
ExpectHalfRTTData [][]byte
// EmptyEncryptedExtensions, if true, causes the TLS 1.3 server to
// emit an empty EncryptedExtensions block.
EmptyEncryptedExtensions bool
// EncryptedExtensionsWithKeyShare, if true, causes the TLS 1.3 server to
// include the KeyShare extension in the EncryptedExtensions block.
EncryptedExtensionsWithKeyShare bool
// AlwaysSendHelloRetryRequest, if true, causes a HelloRetryRequest to
// be sent by the server, even if empty.
AlwaysSendHelloRetryRequest bool
// SecondHelloRetryRequest, if true, causes the TLS 1.3 server to send
// two HelloRetryRequests instead of one.
SecondHelloRetryRequest bool
// SendHelloRetryRequestCurve, if non-zero, causes the server to send
// the specified curve in a HelloRetryRequest.
SendHelloRetryRequestCurve CurveID
// SendHelloRetryRequestCipherSuite, if non-zero, causes the server to send
// the specified cipher suite in a HelloRetryRequest.
SendHelloRetryRequestCipherSuite uint16
// SendHelloRetryRequestCookie, if not nil, contains a cookie to be
// sent by the server in HelloRetryRequest.
SendHelloRetryRequestCookie []byte
// DuplicateHelloRetryRequestExtensions, if true, causes all
// HelloRetryRequest extensions to be sent twice.
DuplicateHelloRetryRequestExtensions bool
// SendServerHelloVersion, if non-zero, causes the server to send the
// specified value in ServerHello version field.
SendServerHelloVersion uint16
// SendServerSupportedExtensionVersion, if non-zero, causes the server to send
// the specified value in supported_versions extension in the ServerHello.
SendServerSupportedExtensionVersion uint16
// SkipHelloRetryRequest, if true, causes the TLS 1.3 server to not send
// HelloRetryRequest.
SkipHelloRetryRequest bool
// PackHelloRequestWithFinished, if true, causes the TLS server to send
// HelloRequest in the same record as Finished.
PackHelloRequestWithFinished bool
// ExpectMissingKeyShare, if true, causes the TLS server to fail the
// connection if the selected curve appears in the client's initial
// ClientHello. That is, it requires that a HelloRetryRequest be sent.
ExpectMissingKeyShare bool
// SendExtraFinished, if true, causes an extra Finished message to be
// sent.
SendExtraFinished bool
// SendRequestContext, if not empty, is the request context to send in
// a TLS 1.3 CertificateRequest.
SendRequestContext []byte
// OmitCertificateRequestAlgorithms, if true, omits the signature_algorithm
// extension in a TLS 1.3 CertificateRequest.
OmitCertificateRequestAlgorithms bool
// SendCustomCertificateRequest, if non-zero, send an additional custom
// extension in a TLS 1.3 CertificateRequest.
SendCustomCertificateRequest uint16
// SendSNIWarningAlert, if true, causes the server to send an
// unrecognized_name alert before the ServerHello.
SendSNIWarningAlert bool
// SendCompressionMethods, if not nil, is the compression method list to
// send in the ClientHello.
SendCompressionMethods []byte
// SendCompressionMethod is the compression method to send in the
// ServerHello.
SendCompressionMethod byte
// AlwaysSendPreSharedKeyIdentityHint, if true, causes the server to
// always send a ServerKeyExchange for PSK ciphers, even if the identity
// hint is empty.
AlwaysSendPreSharedKeyIdentityHint bool
// TrailingKeyShareData, if true, causes the client key share list to
// include a trailing byte.
TrailingKeyShareData bool
// InvalidChannelIDSignature, if true, causes the client to generate an
// invalid Channel ID signature.
InvalidChannelIDSignature bool
// ExpectGREASE, if true, causes messages without GREASE values to be
// rejected. See draft-davidben-tls-grease-01.
ExpectGREASE bool
// SendShortPSKBinder, if true, causes the client to send a PSK binder
// that is one byte shorter than it should be.
SendShortPSKBinder bool
// SendInvalidPSKBinder, if true, causes the client to send an invalid
// PSK binder.
SendInvalidPSKBinder bool
// SendNoPSKBinder, if true, causes the client to send no PSK binders.
SendNoPSKBinder bool
// SendExtraPSKBinder, if true, causes the client to send an extra PSK
// binder.
SendExtraPSKBinder bool
// PSKBinderFirst, if true, causes the client to send the PSK Binder
// extension as the first extension instead of the last extension.
PSKBinderFirst bool
// NoOCSPStapling, if true, causes the client to not request OCSP
// stapling.
NoOCSPStapling bool
// NoSignedCertificateTimestamps, if true, causes the client to not
// request signed certificate timestamps.
NoSignedCertificateTimestamps bool
// SendSupportedPointFormats, if not nil, is the list of supported point
// formats to send in ClientHello or ServerHello. If set to a non-nil
// empty slice, no extension will be sent.
SendSupportedPointFormats []byte
// SendServerSupportedCurves, if true, causes the server to send its
// supported curves list in the ServerHello (TLS 1.2) or
// EncryptedExtensions (TLS 1.3) message. This is invalid in TLS 1.2 and
// valid in TLS 1.3.
SendServerSupportedCurves bool
// MaxReceivePlaintext, if non-zero, is the maximum plaintext record
// length accepted from the peer.
MaxReceivePlaintext int
// SendTicketLifetime, if non-zero, is the ticket lifetime to send in
// NewSessionTicket messages.
SendTicketLifetime time.Duration
// SendServerNameAck, if true, causes the server to acknowledge the SNI
// extension.
SendServerNameAck bool
// ExpectCertificateReqNames, if not nil, contains the list of X.509
// names that must be sent in a CertificateRequest from the server.
ExpectCertificateReqNames [][]byte
// RenegotiationCertificate, if not nil, is the certificate to use on
// renegotiation handshakes.
RenegotiationCertificate *Certificate
// ExpectNoCertificateAuthoritiesExtension, if true, causes the client to
// reject CertificateRequest with the CertificateAuthorities extension.
ExpectNoCertificateAuthoritiesExtension bool
// UseLegacySigningAlgorithm, if non-zero, is the signature algorithm
// to use when signing in TLS 1.1 and earlier where algorithms are not
// negotiated.
UseLegacySigningAlgorithm signatureAlgorithm
// SendServerHelloAsHelloRetryRequest, if true, causes the server to
// send ServerHello messages with a HelloRetryRequest type field.
SendServerHelloAsHelloRetryRequest bool
// RejectUnsolicitedKeyUpdate, if true, causes all unsolicited
// KeyUpdates from the peer to be rejected.
RejectUnsolicitedKeyUpdate bool
// OmitExtensions, if true, causes the extensions field in ClientHello
// and ServerHello messages to be omitted.
OmitExtensions bool
// EmptyExtensions, if true, causes the extensions field in ClientHello
// and ServerHello messages to be present, but empty.
EmptyExtensions bool
// ExpectOmitExtensions, if true, causes the client to reject
// ServerHello messages that do not omit extensions.
ExpectOmitExtensions bool
// ExpectRecordSplitting, if true, causes application records to only be
// accepted if they follow a 1/n-1 record split.
ExpectRecordSplitting bool
// PadClientHello, if non-zero, pads the ClientHello to a multiple of
// that many bytes.
PadClientHello int
// SendDraftTLS13DowngradeRandom, if true, causes the server to send the
// draft TLS 1.3 anti-downgrade signal.
SendDraftTLS13DowngradeRandom bool
// ExpectDraftTLS13DowngradeRandom, if true, causes the client to
// require the server send the draft TLS 1.3 anti-downgrade signal.
ExpectDraftTLS13DowngradeRandom bool
// ExpectDummyPQPaddingLength, if not zero, causes the server to
// require that the client sent a dummy PQ padding extension of this
// length.
ExpectDummyPQPaddingLength int
}
func (c *Config) serverInit() {
if c.SessionTicketsDisabled {
return
}
// If the key has already been set then we have nothing to do.
for _, b := range c.SessionTicketKey {
if b != 0 {
return
}
}
if _, err := io.ReadFull(c.rand(), c.SessionTicketKey[:]); err != nil {
c.SessionTicketsDisabled = true
}
}
func (c *Config) rand() io.Reader {
r := c.Rand
if r == nil {
return rand.Reader
}
return r
}
func (c *Config) time() time.Time {
t := c.Time
if t == nil {
t = time.Now
}
return t()
}
func (c *Config) cipherSuites() []uint16 {
s := c.CipherSuites
if s == nil {
s = defaultCipherSuites()
}
return s
}
func (c *Config) minVersion(isDTLS bool) uint16 {
ret := uint16(minVersion)
if c != nil && c.MinVersion != 0 {
ret = c.MinVersion
}
if isDTLS {
// The lowest version of DTLS is 1.0. There is no DSSL 3.0.
if ret < VersionTLS10 {
return VersionTLS10
}
// There is no such thing as DTLS 1.1.
if ret == VersionTLS11 {
return VersionTLS12
}
}
return ret
}
func (c *Config) maxVersion(isDTLS bool) uint16 {
ret := uint16(maxVersion)
if c != nil && c.MaxVersion != 0 {
ret = c.MaxVersion
}
if isDTLS {
// We only implement up to DTLS 1.2.
if ret > VersionTLS12 {
return VersionTLS12
}
// There is no such thing as DTLS 1.1.
if ret == VersionTLS11 {
return VersionTLS10
}
}
return ret
}
var defaultCurvePreferences = []CurveID{CurveX25519, CurveP256, CurveP384, CurveP521}
func (c *Config) curvePreferences() []CurveID {
if c == nil || len(c.CurvePreferences) == 0 {
return defaultCurvePreferences
}
return c.CurvePreferences
}
func (c *Config) defaultCurves() map[CurveID]bool {
defaultCurves := make(map[CurveID]bool)
curves := c.DefaultCurves
if c == nil || c.DefaultCurves == nil {
curves = c.curvePreferences()
}
for _, curveID := range curves {
defaultCurves[curveID] = true
}
return defaultCurves
}
func wireToVersion(vers uint16, isDTLS bool) (uint16, bool) {
if isDTLS {
switch vers {
case VersionDTLS12:
return VersionTLS12, true
case VersionDTLS10:
return VersionTLS10, true
}
} else {
switch vers {
case VersionSSL30, VersionTLS10, VersionTLS11, VersionTLS12:
return vers, true
case tls13Draft23Version:
return VersionTLS13, true
}
}
return 0, false
}
// isSupportedVersion checks if the specified wire version is acceptable. If so,
// it returns true and the corresponding protocol version. Otherwise, it returns
// false.
func (c *Config) isSupportedVersion(wireVers uint16, isDTLS bool) (uint16, bool) {
if c.TLS13Variant != TLS13Draft23 && wireVers == tls13Draft23Version {
return 0, false
}
vers, ok := wireToVersion(wireVers, isDTLS)
if !ok || c.minVersion(isDTLS) > vers || vers > c.maxVersion(isDTLS) {
return 0, false
}
return vers, true
}
func (c *Config) supportedVersions(isDTLS bool) []uint16 {
versions := allTLSWireVersions
if isDTLS {
versions = allDTLSWireVersions
}
var ret []uint16
for _, vers := range versions {
if _, ok := c.isSupportedVersion(vers, isDTLS); ok {
ret = append(ret, vers)
}
}
return ret
}
// getCertificateForName returns the best certificate for the given name,
// defaulting to the first element of c.Certificates if there are no good
// options.
func (c *Config) getCertificateForName(name string) *Certificate {
if len(c.Certificates) == 1 || c.NameToCertificate == nil {
// There's only one choice, so no point doing any work.
return &c.Certificates[0]
}
name = strings.ToLower(name)
for len(name) > 0 && name[len(name)-1] == '.' {
name = name[:len(name)-1]
}
if cert, ok := c.NameToCertificate[name]; ok {
return cert
}
// try replacing labels in the name with wildcards until we get a
// match.
labels := strings.Split(name, ".")
for i := range labels {
labels[i] = "*"
candidate := strings.Join(labels, ".")
if cert, ok := c.NameToCertificate[candidate]; ok {
return cert
}
}
// If nothing matches, return the first certificate.
return &c.Certificates[0]
}
func (c *Config) signSignatureAlgorithms() []signatureAlgorithm {
if c != nil && c.SignSignatureAlgorithms != nil {
return c.SignSignatureAlgorithms
}
return supportedSignatureAlgorithms
}
func (c *Config) verifySignatureAlgorithms() []signatureAlgorithm {
if c != nil && c.VerifySignatureAlgorithms != nil {
return c.VerifySignatureAlgorithms
}
return supportedSignatureAlgorithms
}
// BuildNameToCertificate parses c.Certificates and builds c.NameToCertificate
// from the CommonName and SubjectAlternateName fields of each of the leaf
// certificates.
func (c *Config) BuildNameToCertificate() {
c.NameToCertificate = make(map[string]*Certificate)
for i := range c.Certificates {
cert := &c.Certificates[i]
x509Cert, err := x509.ParseCertificate(cert.Certificate[0])
if err != nil {
continue
}
if len(x509Cert.Subject.CommonName) > 0 {
c.NameToCertificate[x509Cert.Subject.CommonName] = cert
}
for _, san := range x509Cert.DNSNames {
c.NameToCertificate[san] = cert
}
}
}
// A Certificate is a chain of one or more certificates, leaf first.
type Certificate struct {
Certificate [][]byte
PrivateKey crypto.PrivateKey // supported types: *rsa.PrivateKey, *ecdsa.PrivateKey
// OCSPStaple contains an optional OCSP response which will be served
// to clients that request it.
OCSPStaple []byte
// SignedCertificateTimestampList contains an optional encoded
// SignedCertificateTimestampList structure which will be
// served to clients that request it.
SignedCertificateTimestampList []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 TLS record.
type record struct {
contentType recordType
major, minor uint8
payload []byte
}
type handshakeMessage interface {
marshal() []byte
unmarshal([]byte) bool
}
// lruSessionCache is a client or server session cache implementation
// that uses an LRU caching strategy.
type lruSessionCache struct {
sync.Mutex
m map[string]*list.Element
q *list.List
capacity int
}
type lruSessionCacheEntry struct {
sessionKey string
state interface{}
}
// Put adds the provided (sessionKey, cs) pair to the cache.
func (c *lruSessionCache) Put(sessionKey string, cs interface{}) {
c.Lock()
defer c.Unlock()
if elem, ok := c.m[sessionKey]; ok {
entry := elem.Value.(*lruSessionCacheEntry)
entry.state = cs
c.q.MoveToFront(elem)
return
}
if c.q.Len() < c.capacity {
entry := &lruSessionCacheEntry{sessionKey, cs}
c.m[sessionKey] = c.q.PushFront(entry)
return
}
elem := c.q.Back()
entry := elem.Value.(*lruSessionCacheEntry)
delete(c.m, entry.sessionKey)
entry.sessionKey = sessionKey
entry.state = cs
c.q.MoveToFront(elem)
c.m[sessionKey] = elem
}
// Get returns the value associated with a given key. It returns (nil,
// false) if no value is found.
func (c *lruSessionCache) Get(sessionKey string) (interface{}, bool) {
c.Lock()
defer c.Unlock()
if elem, ok := c.m[sessionKey]; ok {
c.q.MoveToFront(elem)
return elem.Value.(*lruSessionCacheEntry).state, true
}
return nil, false
}
// lruClientSessionCache is a ClientSessionCache implementation that
// uses an LRU caching strategy.
type lruClientSessionCache struct {
lruSessionCache
}
func (c *lruClientSessionCache) Put(sessionKey string, cs *ClientSessionState) {
c.lruSessionCache.Put(sessionKey, cs)
}
func (c *lruClientSessionCache) Get(sessionKey string) (*ClientSessionState, bool) {
cs, ok := c.lruSessionCache.Get(sessionKey)
if !ok {
return nil, false
}
return cs.(*ClientSessionState), true
}
// lruServerSessionCache is a ServerSessionCache implementation that
// uses an LRU caching strategy.
type lruServerSessionCache struct {
lruSessionCache
}
func (c *lruServerSessionCache) Put(sessionId string, session *sessionState) {
c.lruSessionCache.Put(sessionId, session)
}
func (c *lruServerSessionCache) Get(sessionId string) (*sessionState, bool) {
cs, ok := c.lruSessionCache.Get(sessionId)
if !ok {
return nil, false
}
return cs.(*sessionState), true
}
// NewLRUClientSessionCache returns a ClientSessionCache with the given
// capacity that uses an LRU strategy. If capacity is < 1, a default capacity
// is used instead.
func NewLRUClientSessionCache(capacity int) ClientSessionCache {
const defaultSessionCacheCapacity = 64
if capacity < 1 {
capacity = defaultSessionCacheCapacity
}
return &lruClientSessionCache{
lruSessionCache{
m: make(map[string]*list.Element),
q: list.New(),
capacity: capacity,
},
}
}
// NewLRUServerSessionCache returns a ServerSessionCache with the given
// capacity that uses an LRU strategy. If capacity is < 1, a default capacity
// is used instead.
func NewLRUServerSessionCache(capacity int) ServerSessionCache {
const defaultSessionCacheCapacity = 64
if capacity < 1 {
capacity = defaultSessionCacheCapacity
}
return &lruServerSessionCache{
lruSessionCache{
m: make(map[string]*list.Element),
q: list.New(),
capacity: capacity,
},
}
}
// TODO(jsing): Make these available to both crypto/x509 and crypto/tls.
type dsaSignature struct {
R, S *big.Int
}
type ecdsaSignature dsaSignature
var emptyConfig Config
func defaultConfig() *Config {
return &emptyConfig
}
var (
once sync.Once
varDefaultCipherSuites []uint16
)
func defaultCipherSuites() []uint16 {
once.Do(initDefaultCipherSuites)
return varDefaultCipherSuites
}
func initDefaultCipherSuites() {
for _, suite := range cipherSuites {
if suite.flags&suitePSK == 0 {
varDefaultCipherSuites = append(varDefaultCipherSuites, suite.id)
}
}
}
func unexpectedMessageError(wanted, got interface{}) error {
return fmt.Errorf("tls: received unexpected handshake message of type %T when waiting for %T", got, wanted)
}
func isSupportedSignatureAlgorithm(sigAlg signatureAlgorithm, sigAlgs []signatureAlgorithm) bool {
for _, s := range sigAlgs {
if s == sigAlg {
return true
}
}
return false
}
var (
// See draft-ietf-tls-tls13-16, section 6.3.1.2.
downgradeTLS13 = []byte{0x44, 0x4f, 0x57, 0x4e, 0x47, 0x52, 0x44, 0x01}
downgradeTLS12 = []byte{0x44, 0x4f, 0x57, 0x4e, 0x47, 0x52, 0x44, 0x00}
downgradeTLS13Draft = []uint8{0x95, 0xb9, 0x9f, 0x87, 0x22, 0xfe, 0x9b, 0x64}
)
func containsGREASE(values []uint16) bool {
for _, v := range values {
if isGREASEValue(v) {
return true
}
}
return false
}