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package mint
import (
"bytes"
"crypto"
"crypto/x509"
"encoding/binary"
"fmt"
"github.com/bifurcation/mint/syntax"
)
type HandshakeMessageBody interface {
Type() HandshakeType
Marshal() ([]byte, error)
Unmarshal(data []byte) (int, error)
}
// struct {
// ProtocolVersion legacy_version = 0x0303; /* TLS v1.2 */
// Random random;
// opaque legacy_session_id<0..32>;
// CipherSuite cipher_suites<2..2^16-2>;
// opaque legacy_compression_methods<1..2^8-1>;
// Extension extensions<0..2^16-1>;
// } ClientHello;
type ClientHelloBody struct {
LegacyVersion uint16
Random [32]byte
LegacySessionID []byte
CipherSuites []CipherSuite
Extensions ExtensionList
}
type clientHelloBodyInnerTLS struct {
LegacyVersion uint16
Random [32]byte
LegacySessionID []byte `tls:"head=1,max=32"`
CipherSuites []CipherSuite `tls:"head=2,min=2"`
LegacyCompressionMethods []byte `tls:"head=1,min=1"`
Extensions []Extension `tls:"head=2"`
}
type clientHelloBodyInnerDTLS struct {
LegacyVersion uint16
Random [32]byte
LegacySessionID []byte `tls:"head=1,max=32"`
EmptyCookie uint8
CipherSuites []CipherSuite `tls:"head=2,min=2"`
LegacyCompressionMethods []byte `tls:"head=1,min=1"`
Extensions []Extension `tls:"head=2"`
}
func (ch ClientHelloBody) Type() HandshakeType {
return HandshakeTypeClientHello
}
func (ch ClientHelloBody) Marshal() ([]byte, error) {
if ch.LegacyVersion == tls12Version {
return syntax.Marshal(clientHelloBodyInnerTLS{
LegacyVersion: ch.LegacyVersion,
Random: ch.Random,
LegacySessionID: []byte{},
CipherSuites: ch.CipherSuites,
LegacyCompressionMethods: []byte{0},
Extensions: ch.Extensions,
})
} else {
return syntax.Marshal(clientHelloBodyInnerDTLS{
LegacyVersion: ch.LegacyVersion,
Random: ch.Random,
LegacySessionID: []byte{},
CipherSuites: ch.CipherSuites,
LegacyCompressionMethods: []byte{0},
Extensions: ch.Extensions,
})
}
}
func (ch *ClientHelloBody) Unmarshal(data []byte) (int, error) {
var read int
var err error
// Note that this might be 0, in which case we do TLS. That
// makes the tests easier.
if ch.LegacyVersion != dtls12WireVersion {
var inner clientHelloBodyInnerTLS
read, err = syntax.Unmarshal(data, &inner)
if err != nil {
return 0, err
}
if len(inner.LegacyCompressionMethods) != 1 || inner.LegacyCompressionMethods[0] != 0 {
return 0, fmt.Errorf("tls.clienthello: Invalid compression method")
}
ch.LegacyVersion = inner.LegacyVersion
ch.Random = inner.Random
ch.LegacySessionID = inner.LegacySessionID
ch.CipherSuites = inner.CipherSuites
ch.Extensions = inner.Extensions
} else {
var inner clientHelloBodyInnerDTLS
read, err = syntax.Unmarshal(data, &inner)
if err != nil {
return 0, err
}
if inner.EmptyCookie != 0 {
return 0, fmt.Errorf("tls.clienthello: Invalid cookie")
}
if len(inner.LegacyCompressionMethods) != 1 || inner.LegacyCompressionMethods[0] != 0 {
return 0, fmt.Errorf("tls.clienthello: Invalid compression method")
}
ch.LegacyVersion = inner.LegacyVersion
ch.Random = inner.Random
ch.LegacySessionID = inner.LegacySessionID
ch.CipherSuites = inner.CipherSuites
ch.Extensions = inner.Extensions
}
return read, nil
}
// TODO: File a spec bug to clarify this
func (ch ClientHelloBody) Truncated() ([]byte, error) {
if len(ch.Extensions) == 0 {
return nil, fmt.Errorf("tls.clienthello.truncate: No extensions")
}
pskExt := ch.Extensions[len(ch.Extensions)-1]
if pskExt.ExtensionType != ExtensionTypePreSharedKey {
return nil, fmt.Errorf("tls.clienthello.truncate: Last extension is not PSK")
}
body, err := ch.Marshal()
if err != nil {
return nil, err
}
chm := &HandshakeMessage{
msgType: ch.Type(),
body: body,
length: uint32(len(body)),
}
chData := chm.Marshal()
psk := PreSharedKeyExtension{
HandshakeType: HandshakeTypeClientHello,
}
_, err = psk.Unmarshal(pskExt.ExtensionData)
if err != nil {
return nil, err
}
// Marshal just the binders so that we know how much to truncate
binders := struct {
Binders []PSKBinderEntry `tls:"head=2,min=33"`
}{Binders: psk.Binders}
binderData, _ := syntax.Marshal(binders)
binderLen := len(binderData)
chLen := len(chData)
return chData[:chLen-binderLen], nil
}
// struct {
// ProtocolVersion legacy_version = 0x0303; /* TLS v1.2 */
// Random random;
// opaque legacy_session_id_echo<0..32>;
// CipherSuite cipher_suite;
// uint8 legacy_compression_method = 0;
// Extension extensions<6..2^16-1>;
// } ServerHello;
type ServerHelloBody struct {
Version uint16
Random [32]byte
LegacySessionID []byte `tls:"head=1,max=32"`
CipherSuite CipherSuite
LegacyCompressionMethod uint8
Extensions ExtensionList `tls:"head=2"`
}
func (sh ServerHelloBody) Type() HandshakeType {
return HandshakeTypeServerHello
}
func (sh ServerHelloBody) Marshal() ([]byte, error) {
return syntax.Marshal(sh)
}
func (sh *ServerHelloBody) Unmarshal(data []byte) (int, error) {
return syntax.Unmarshal(data, sh)
}
// struct {
// opaque verify_data[verify_data_length];
// } Finished;
//
// verifyDataLen is not a field in the TLS struct, but we add it here so
// that calling code can tell us how much data to expect when we marshal /
// unmarshal. (We could add this to the marshal/unmarshal methods, but let's
// try to keep the signature consistent for now.)
//
// For similar reasons, we don't use the `syntax` module here, because this
// struct doesn't map well to standard TLS presentation language concepts.
//
// TODO: File a spec bug
type FinishedBody struct {
VerifyDataLen int
VerifyData []byte
}
func (fin FinishedBody) Type() HandshakeType {
return HandshakeTypeFinished
}
func (fin FinishedBody) Marshal() ([]byte, error) {
if len(fin.VerifyData) != fin.VerifyDataLen {
return nil, fmt.Errorf("tls.finished: data length mismatch")
}
body := make([]byte, len(fin.VerifyData))
copy(body, fin.VerifyData)
return body, nil
}
func (fin *FinishedBody) Unmarshal(data []byte) (int, error) {
if len(data) < fin.VerifyDataLen {
return 0, fmt.Errorf("tls.finished: Malformed finished; too short")
}
fin.VerifyData = make([]byte, fin.VerifyDataLen)
copy(fin.VerifyData, data[:fin.VerifyDataLen])
return fin.VerifyDataLen, nil
}
// struct {
// Extension extensions<0..2^16-1>;
// } EncryptedExtensions;
//
// Marshal() and Unmarshal() are handled by ExtensionList
type EncryptedExtensionsBody struct {
Extensions ExtensionList `tls:"head=2"`
}
func (ee EncryptedExtensionsBody) Type() HandshakeType {
return HandshakeTypeEncryptedExtensions
}
func (ee EncryptedExtensionsBody) Marshal() ([]byte, error) {
return syntax.Marshal(ee)
}
func (ee *EncryptedExtensionsBody) Unmarshal(data []byte) (int, error) {
return syntax.Unmarshal(data, ee)
}
// opaque ASN1Cert<1..2^24-1>;
//
// struct {
// ASN1Cert cert_data;
// Extension extensions<0..2^16-1>
// } CertificateEntry;
//
// struct {
// opaque certificate_request_context<0..2^8-1>;
// CertificateEntry certificate_list<0..2^24-1>;
// } Certificate;
type CertificateEntry struct {
CertData *x509.Certificate
Extensions ExtensionList
}
type CertificateBody struct {
CertificateRequestContext []byte
CertificateList []CertificateEntry
}
type certificateEntryInner struct {
CertData []byte `tls:"head=3,min=1"`
Extensions ExtensionList `tls:"head=2"`
}
type certificateBodyInner struct {
CertificateRequestContext []byte `tls:"head=1"`
CertificateList []certificateEntryInner `tls:"head=3"`
}
func (c CertificateBody) Type() HandshakeType {
return HandshakeTypeCertificate
}
func (c CertificateBody) Marshal() ([]byte, error) {
inner := certificateBodyInner{
CertificateRequestContext: c.CertificateRequestContext,
CertificateList: make([]certificateEntryInner, len(c.CertificateList)),
}
for i, entry := range c.CertificateList {
inner.CertificateList[i] = certificateEntryInner{
CertData: entry.CertData.Raw,
Extensions: entry.Extensions,
}
}
return syntax.Marshal(inner)
}
func (c *CertificateBody) Unmarshal(data []byte) (int, error) {
inner := certificateBodyInner{}
read, err := syntax.Unmarshal(data, &inner)
if err != nil {
return read, err
}
c.CertificateRequestContext = inner.CertificateRequestContext
c.CertificateList = make([]CertificateEntry, len(inner.CertificateList))
for i, entry := range inner.CertificateList {
c.CertificateList[i].CertData, err = x509.ParseCertificate(entry.CertData)
if err != nil {
return 0, fmt.Errorf("tls:certificate: Certificate failed to parse: %v", err)
}
c.CertificateList[i].Extensions = entry.Extensions
}
return read, nil
}
// struct {
// SignatureScheme algorithm;
// opaque signature<0..2^16-1>;
// } CertificateVerify;
type CertificateVerifyBody struct {
Algorithm SignatureScheme
Signature []byte `tls:"head=2"`
}
func (cv CertificateVerifyBody) Type() HandshakeType {
return HandshakeTypeCertificateVerify
}
func (cv CertificateVerifyBody) Marshal() ([]byte, error) {
return syntax.Marshal(cv)
}
func (cv *CertificateVerifyBody) Unmarshal(data []byte) (int, error) {
return syntax.Unmarshal(data, cv)
}
func (cv *CertificateVerifyBody) EncodeSignatureInput(data []byte) []byte {
// TODO: Change context for client auth
// TODO: Put this in a const
const context = "TLS 1.3, server CertificateVerify"
sigInput := bytes.Repeat([]byte{0x20}, 64)
sigInput = append(sigInput, []byte(context)...)
sigInput = append(sigInput, []byte{0}...)
sigInput = append(sigInput, data...)
return sigInput
}
func (cv *CertificateVerifyBody) Sign(privateKey crypto.Signer, handshakeHash []byte) (err error) {
sigInput := cv.EncodeSignatureInput(handshakeHash)
cv.Signature, err = sign(cv.Algorithm, privateKey, sigInput)
logf(logTypeHandshake, "Signed: alg=[%04x] sigInput=[%x], sig=[%x]", cv.Algorithm, sigInput, cv.Signature)
return
}
func (cv *CertificateVerifyBody) Verify(publicKey crypto.PublicKey, handshakeHash []byte) error {
sigInput := cv.EncodeSignatureInput(handshakeHash)
logf(logTypeHandshake, "About to verify: alg=[%04x] sigInput=[%x], sig=[%x]", cv.Algorithm, sigInput, cv.Signature)
return verify(cv.Algorithm, publicKey, sigInput, cv.Signature)
}
// struct {
// opaque certificate_request_context<0..2^8-1>;
// Extension extensions<2..2^16-1>;
// } CertificateRequest;
type CertificateRequestBody struct {
CertificateRequestContext []byte `tls:"head=1"`
Extensions ExtensionList `tls:"head=2"`
}
func (cr CertificateRequestBody) Type() HandshakeType {
return HandshakeTypeCertificateRequest
}
func (cr CertificateRequestBody) Marshal() ([]byte, error) {
return syntax.Marshal(cr)
}
func (cr *CertificateRequestBody) Unmarshal(data []byte) (int, error) {
return syntax.Unmarshal(data, cr)
}
// struct {
// uint32 ticket_lifetime;
// uint32 ticket_age_add;
// opaque ticket_nonce<1..255>;
// opaque ticket<1..2^16-1>;
// Extension extensions<0..2^16-2>;
// } NewSessionTicket;
type NewSessionTicketBody struct {
TicketLifetime uint32
TicketAgeAdd uint32
TicketNonce []byte `tls:"head=1"`
Ticket []byte `tls:"head=2,min=1"`
Extensions ExtensionList `tls:"head=2"`
}
const ticketNonceLen = 16
func NewSessionTicket(ticketLen int, ticketLifetime uint32) (*NewSessionTicketBody, error) {
buf := make([]byte, 4+ticketNonceLen+ticketLen)
_, err := prng.Read(buf)
if err != nil {
return nil, err
}
tkt := &NewSessionTicketBody{
TicketLifetime: ticketLifetime,
TicketAgeAdd: binary.BigEndian.Uint32(buf[:4]),
TicketNonce: buf[4 : 4+ticketNonceLen],
Ticket: buf[4+ticketNonceLen:],
}
return tkt, err
}
func (tkt NewSessionTicketBody) Type() HandshakeType {
return HandshakeTypeNewSessionTicket
}
func (tkt NewSessionTicketBody) Marshal() ([]byte, error) {
return syntax.Marshal(tkt)
}
func (tkt *NewSessionTicketBody) Unmarshal(data []byte) (int, error) {
return syntax.Unmarshal(data, tkt)
}
// enum {
// update_not_requested(0), update_requested(1), (255)
// } KeyUpdateRequest;
//
// struct {
// KeyUpdateRequest request_update;
// } KeyUpdate;
type KeyUpdateBody struct {
KeyUpdateRequest KeyUpdateRequest
}
func (ku KeyUpdateBody) Type() HandshakeType {
return HandshakeTypeKeyUpdate
}
func (ku KeyUpdateBody) Marshal() ([]byte, error) {
return syntax.Marshal(ku)
}
func (ku *KeyUpdateBody) Unmarshal(data []byte) (int, error) {
return syntax.Unmarshal(data, ku)
}
// struct {} EndOfEarlyData;
type EndOfEarlyDataBody struct{}
func (eoed EndOfEarlyDataBody) Type() HandshakeType {
return HandshakeTypeEndOfEarlyData
}
func (eoed EndOfEarlyDataBody) Marshal() ([]byte, error) {
return []byte{}, nil
}
func (eoed *EndOfEarlyDataBody) Unmarshal(data []byte) (int, error) {
return 0, nil
}
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