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package dtls
import (
"fmt"
"hash"
"github.com/pion/dtls/v2/internal/ciphersuite"
"github.com/pion/dtls/v2/pkg/crypto/clientcertificate"
"github.com/pion/dtls/v2/pkg/protocol/recordlayer"
)
// CipherSuiteID is an ID for our supported CipherSuites
type CipherSuiteID = ciphersuite.ID
// Supported Cipher Suites
const (
// AES-128-CCM
TLS_ECDHE_ECDSA_WITH_AES_128_CCM CipherSuiteID = ciphersuite.TLS_ECDHE_ECDSA_WITH_AES_128_CCM //nolint:golint,stylecheck
TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8 CipherSuiteID = ciphersuite.TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8 //nolint:golint,stylecheck
// AES-128-GCM-SHA256
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 CipherSuiteID = ciphersuite.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 //nolint:golint,stylecheck
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 CipherSuiteID = ciphersuite.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 //nolint:golint,stylecheck
// AES-256-CBC-SHA
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA CipherSuiteID = ciphersuite.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA //nolint:golint,stylecheck
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA CipherSuiteID = ciphersuite.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA //nolint:golint,stylecheck
TLS_PSK_WITH_AES_128_CCM CipherSuiteID = ciphersuite.TLS_PSK_WITH_AES_128_CCM //nolint:golint,stylecheck
TLS_PSK_WITH_AES_128_CCM_8 CipherSuiteID = ciphersuite.TLS_PSK_WITH_AES_128_CCM_8 //nolint:golint,stylecheck
TLS_PSK_WITH_AES_128_GCM_SHA256 CipherSuiteID = ciphersuite.TLS_PSK_WITH_AES_128_GCM_SHA256 //nolint:golint,stylecheck
TLS_PSK_WITH_AES_128_CBC_SHA256 CipherSuiteID = ciphersuite.TLS_PSK_WITH_AES_128_CBC_SHA256 //nolint:golint,stylecheck
)
// CipherSuiteAuthenticationType controls what authentication method is using during the handshake for a CipherSuite
type CipherSuiteAuthenticationType = ciphersuite.AuthenticationType
// AuthenticationType Enums
const (
CipherSuiteAuthenticationTypeCertificate CipherSuiteAuthenticationType = ciphersuite.AuthenticationTypeCertificate
CipherSuiteAuthenticationTypePreSharedKey CipherSuiteAuthenticationType = ciphersuite.AuthenticationTypePreSharedKey
CipherSuiteAuthenticationTypeAnonymous CipherSuiteAuthenticationType = ciphersuite.AuthenticationTypeAnonymous
)
var _ = allCipherSuites() // Necessary until this function isn't only used by Go 1.14
// CipherSuite is an interface that all DTLS CipherSuites must satisfy
type CipherSuite interface {
// String of CipherSuite, only used for logging
String() string
// ID of CipherSuite.
ID() CipherSuiteID
// What type of Certificate does this CipherSuite use
CertificateType() clientcertificate.Type
// What Hash function is used during verification
HashFunc() func() hash.Hash
// AuthenticationType controls what authentication method is using during the handshake
AuthenticationType() CipherSuiteAuthenticationType
// Called when keying material has been generated, should initialize the internal cipher
Init(masterSecret, clientRandom, serverRandom []byte, isClient bool) error
IsInitialized() bool
Encrypt(pkt *recordlayer.RecordLayer, raw []byte) ([]byte, error)
Decrypt(in []byte) ([]byte, error)
}
// CipherSuiteName provides the same functionality as tls.CipherSuiteName
// that appeared first in Go 1.14.
//
// Our implementation differs slightly in that it takes in a CiperSuiteID,
// like the rest of our library, instead of a uint16 like crypto/tls.
func CipherSuiteName(id CipherSuiteID) string {
suite := cipherSuiteForID(id, nil)
if suite != nil {
return suite.String()
}
return fmt.Sprintf("0x%04X", uint16(id))
}
// Taken from https://www.iana.org/assignments/tls-parameters/tls-parameters.xml
// A cipherSuite is a specific combination of key agreement, cipher and MAC
// function.
func cipherSuiteForID(id CipherSuiteID, customCiphers func() []CipherSuite) CipherSuite {
switch id { //nolint:exhaustive
case TLS_ECDHE_ECDSA_WITH_AES_128_CCM:
return ciphersuite.NewTLSEcdheEcdsaWithAes128Ccm()
case TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8:
return ciphersuite.NewTLSEcdheEcdsaWithAes128Ccm8()
case TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256:
return &ciphersuite.TLSEcdheEcdsaWithAes128GcmSha256{}
case TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256:
return &ciphersuite.TLSEcdheRsaWithAes128GcmSha256{}
case TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA:
return &ciphersuite.TLSEcdheEcdsaWithAes256CbcSha{}
case TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA:
return &ciphersuite.TLSEcdheRsaWithAes256CbcSha{}
case TLS_PSK_WITH_AES_128_CCM:
return ciphersuite.NewTLSPskWithAes128Ccm()
case TLS_PSK_WITH_AES_128_CCM_8:
return ciphersuite.NewTLSPskWithAes128Ccm8()
case TLS_PSK_WITH_AES_128_GCM_SHA256:
return &ciphersuite.TLSPskWithAes128GcmSha256{}
case TLS_PSK_WITH_AES_128_CBC_SHA256:
return &ciphersuite.TLSPskWithAes128CbcSha256{}
}
if customCiphers != nil {
for _, c := range customCiphers() {
if c.ID() == id {
return c
}
}
}
return nil
}
// CipherSuites we support in order of preference
func defaultCipherSuites() []CipherSuite {
return []CipherSuite{
&ciphersuite.TLSEcdheEcdsaWithAes128GcmSha256{},
&ciphersuite.TLSEcdheRsaWithAes128GcmSha256{},
&ciphersuite.TLSEcdheEcdsaWithAes256CbcSha{},
&ciphersuite.TLSEcdheRsaWithAes256CbcSha{},
}
}
func allCipherSuites() []CipherSuite {
return []CipherSuite{
ciphersuite.NewTLSEcdheEcdsaWithAes128Ccm(),
ciphersuite.NewTLSEcdheEcdsaWithAes128Ccm8(),
&ciphersuite.TLSEcdheEcdsaWithAes128GcmSha256{},
&ciphersuite.TLSEcdheRsaWithAes128GcmSha256{},
&ciphersuite.TLSEcdheEcdsaWithAes256CbcSha{},
&ciphersuite.TLSEcdheRsaWithAes256CbcSha{},
ciphersuite.NewTLSPskWithAes128Ccm(),
ciphersuite.NewTLSPskWithAes128Ccm8(),
&ciphersuite.TLSPskWithAes128GcmSha256{},
}
}
func cipherSuiteIDs(cipherSuites []CipherSuite) []uint16 {
rtrn := []uint16{}
for _, c := range cipherSuites {
rtrn = append(rtrn, uint16(c.ID()))
}
return rtrn
}
func parseCipherSuites(userSelectedSuites []CipherSuiteID, customCipherSuites func() []CipherSuite, includeCertificateSuites, includePSKSuites bool) ([]CipherSuite, error) {
cipherSuitesForIDs := func(ids []CipherSuiteID) ([]CipherSuite, error) {
cipherSuites := []CipherSuite{}
for _, id := range ids {
c := cipherSuiteForID(id, nil)
if c == nil {
return nil, &invalidCipherSuite{id}
}
cipherSuites = append(cipherSuites, c)
}
return cipherSuites, nil
}
var (
cipherSuites []CipherSuite
err error
i int
)
if userSelectedSuites != nil {
cipherSuites, err = cipherSuitesForIDs(userSelectedSuites)
if err != nil {
return nil, err
}
} else {
cipherSuites = defaultCipherSuites()
}
// Put CustomCipherSuites before ID selected suites
if customCipherSuites != nil {
cipherSuites = append(customCipherSuites(), cipherSuites...)
}
var foundCertificateSuite, foundPSKSuite, foundAnonymousSuite bool
for _, c := range cipherSuites {
switch {
case includeCertificateSuites && c.AuthenticationType() == CipherSuiteAuthenticationTypeCertificate:
foundCertificateSuite = true
case includePSKSuites && c.AuthenticationType() == CipherSuiteAuthenticationTypePreSharedKey:
foundPSKSuite = true
case c.AuthenticationType() == CipherSuiteAuthenticationTypeAnonymous:
foundAnonymousSuite = true
default:
continue
}
cipherSuites[i] = c
i++
}
switch {
case includeCertificateSuites && !foundCertificateSuite && !foundAnonymousSuite:
return nil, errNoAvailableCertificateCipherSuite
case includePSKSuites && !foundPSKSuite:
return nil, errNoAvailablePSKCipherSuite
case i == 0:
return nil, errNoAvailableCipherSuites
}
return cipherSuites[:i], nil
}
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