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-rw-r--r--vendor/golang.org/x/crypto/ssh/certs.go93
-rw-r--r--vendor/golang.org/x/crypto/ssh/client.go25
-rw-r--r--vendor/golang.org/x/crypto/ssh/client_auth.go132
-rw-r--r--vendor/golang.org/x/crypto/ssh/common.go86
-rw-r--r--vendor/golang.org/x/crypto/ssh/handshake.go98
-rw-r--r--vendor/golang.org/x/crypto/ssh/kex.go186
-rw-r--r--vendor/golang.org/x/crypto/ssh/keys.go156
-rw-r--r--vendor/golang.org/x/crypto/ssh/messages.go21
-rw-r--r--vendor/golang.org/x/crypto/ssh/server.go22
-rw-r--r--vendor/golang.org/x/crypto/ssh/session.go1
-rw-r--r--vendor/golang.org/x/crypto/ssh/transport.go10
11 files changed, 480 insertions, 350 deletions
diff --git a/vendor/golang.org/x/crypto/ssh/certs.go b/vendor/golang.org/x/crypto/ssh/certs.go
index 6605bf64..a69e2249 100644
--- a/vendor/golang.org/x/crypto/ssh/certs.go
+++ b/vendor/golang.org/x/crypto/ssh/certs.go
@@ -14,8 +14,10 @@ import (
"time"
)
-// These constants from [PROTOCOL.certkeys] represent the key algorithm names
-// for certificate types supported by this package.
+// Certificate algorithm names from [PROTOCOL.certkeys]. These values can appear
+// in Certificate.Type, PublicKey.Type, and ClientConfig.HostKeyAlgorithms.
+// Unlike key algorithm names, these are not passed to AlgorithmSigner and don't
+// appear in the Signature.Format field.
const (
CertAlgoRSAv01 = "ssh-rsa-cert-v01@openssh.com"
CertAlgoDSAv01 = "ssh-dss-cert-v01@openssh.com"
@@ -25,14 +27,21 @@ const (
CertAlgoSKECDSA256v01 = "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com"
CertAlgoED25519v01 = "ssh-ed25519-cert-v01@openssh.com"
CertAlgoSKED25519v01 = "sk-ssh-ed25519-cert-v01@openssh.com"
+
+ // CertAlgoRSASHA256v01 and CertAlgoRSASHA512v01 can't appear as a
+ // Certificate.Type (or PublicKey.Type), but only in
+ // ClientConfig.HostKeyAlgorithms.
+ CertAlgoRSASHA256v01 = "rsa-sha2-256-cert-v01@openssh.com"
+ CertAlgoRSASHA512v01 = "rsa-sha2-512-cert-v01@openssh.com"
)
-// These constants from [PROTOCOL.certkeys] represent additional signature
-// algorithm names for certificate types supported by this package.
const (
- CertSigAlgoRSAv01 = "ssh-rsa-cert-v01@openssh.com"
- CertSigAlgoRSASHA2256v01 = "rsa-sha2-256-cert-v01@openssh.com"
- CertSigAlgoRSASHA2512v01 = "rsa-sha2-512-cert-v01@openssh.com"
+ // Deprecated: use CertAlgoRSAv01.
+ CertSigAlgoRSAv01 = CertAlgoRSAv01
+ // Deprecated: use CertAlgoRSASHA256v01.
+ CertSigAlgoRSASHA2256v01 = CertAlgoRSASHA256v01
+ // Deprecated: use CertAlgoRSASHA512v01.
+ CertSigAlgoRSASHA2512v01 = CertAlgoRSASHA512v01
)
// Certificate types distinguish between host and user
@@ -431,10 +440,14 @@ func (c *Certificate) SignCert(rand io.Reader, authority Signer) error {
}
c.SignatureKey = authority.PublicKey()
- if v, ok := authority.(AlgorithmSigner); ok {
- if v.PublicKey().Type() == KeyAlgoRSA {
- authority = &rsaSigner{v, SigAlgoRSASHA2512}
+ // Default to KeyAlgoRSASHA512 for ssh-rsa signers.
+ if v, ok := authority.(AlgorithmSigner); ok && v.PublicKey().Type() == KeyAlgoRSA {
+ sig, err := v.SignWithAlgorithm(rand, c.bytesForSigning(), KeyAlgoRSASHA512)
+ if err != nil {
+ return err
}
+ c.Signature = sig
+ return nil
}
sig, err := authority.Sign(rand, c.bytesForSigning())
@@ -445,32 +458,40 @@ func (c *Certificate) SignCert(rand io.Reader, authority Signer) error {
return nil
}
-// certAlgoNames includes a mapping from signature algorithms to the
-// corresponding certificate signature algorithm. When a key type (such
-// as ED25516) is associated with only one algorithm, the KeyAlgo
-// constant is used instead of the SigAlgo.
-var certAlgoNames = map[string]string{
- SigAlgoRSA: CertSigAlgoRSAv01,
- SigAlgoRSASHA2256: CertSigAlgoRSASHA2256v01,
- SigAlgoRSASHA2512: CertSigAlgoRSASHA2512v01,
- KeyAlgoDSA: CertAlgoDSAv01,
- KeyAlgoECDSA256: CertAlgoECDSA256v01,
- KeyAlgoECDSA384: CertAlgoECDSA384v01,
- KeyAlgoECDSA521: CertAlgoECDSA521v01,
- KeyAlgoSKECDSA256: CertAlgoSKECDSA256v01,
- KeyAlgoED25519: CertAlgoED25519v01,
- KeyAlgoSKED25519: CertAlgoSKED25519v01,
+// certKeyAlgoNames is a mapping from known certificate algorithm names to the
+// corresponding public key signature algorithm.
+var certKeyAlgoNames = map[string]string{
+ CertAlgoRSAv01: KeyAlgoRSA,
+ CertAlgoRSASHA256v01: KeyAlgoRSASHA256,
+ CertAlgoRSASHA512v01: KeyAlgoRSASHA512,
+ CertAlgoDSAv01: KeyAlgoDSA,
+ CertAlgoECDSA256v01: KeyAlgoECDSA256,
+ CertAlgoECDSA384v01: KeyAlgoECDSA384,
+ CertAlgoECDSA521v01: KeyAlgoECDSA521,
+ CertAlgoSKECDSA256v01: KeyAlgoSKECDSA256,
+ CertAlgoED25519v01: KeyAlgoED25519,
+ CertAlgoSKED25519v01: KeyAlgoSKED25519,
+}
+
+// underlyingAlgo returns the signature algorithm associated with algo (which is
+// an advertised or negotiated public key or host key algorithm). These are
+// usually the same, except for certificate algorithms.
+func underlyingAlgo(algo string) string {
+ if a, ok := certKeyAlgoNames[algo]; ok {
+ return a
+ }
+ return algo
}
-// certToPrivAlgo returns the underlying algorithm for a certificate algorithm.
-// Panics if a non-certificate algorithm is passed.
-func certToPrivAlgo(algo string) string {
- for privAlgo, pubAlgo := range certAlgoNames {
- if pubAlgo == algo {
- return privAlgo
+// certificateAlgo returns the certificate algorithms that uses the provided
+// underlying signature algorithm.
+func certificateAlgo(algo string) (certAlgo string, ok bool) {
+ for certName, algoName := range certKeyAlgoNames {
+ if algoName == algo {
+ return certName, true
}
}
- panic("unknown cert algorithm")
+ return "", false
}
func (cert *Certificate) bytesForSigning() []byte {
@@ -514,13 +535,13 @@ func (c *Certificate) Marshal() []byte {
return result
}
-// Type returns the key name. It is part of the PublicKey interface.
+// Type returns the certificate algorithm name. It is part of the PublicKey interface.
func (c *Certificate) Type() string {
- algo, ok := certAlgoNames[c.Key.Type()]
+ certName, ok := certificateAlgo(c.Key.Type())
if !ok {
- panic("unknown cert key type " + c.Key.Type())
+ panic("unknown certificate type for key type " + c.Key.Type())
}
- return algo
+ return certName
}
// Verify verifies a signature against the certificate's public
diff --git a/vendor/golang.org/x/crypto/ssh/client.go b/vendor/golang.org/x/crypto/ssh/client.go
index ba8621a8..bdc356cb 100644
--- a/vendor/golang.org/x/crypto/ssh/client.go
+++ b/vendor/golang.org/x/crypto/ssh/client.go
@@ -113,25 +113,16 @@ func (c *connection) clientHandshake(dialAddress string, config *ClientConfig) e
return c.clientAuthenticate(config)
}
-// verifyHostKeySignature verifies the host key obtained in the key
-// exchange.
+// verifyHostKeySignature verifies the host key obtained in the key exchange.
+// algo is the negotiated algorithm, and may be a certificate type.
func verifyHostKeySignature(hostKey PublicKey, algo string, result *kexResult) error {
sig, rest, ok := parseSignatureBody(result.Signature)
if len(rest) > 0 || !ok {
return errors.New("ssh: signature parse error")
}
- // For keys, underlyingAlgo is exactly algo. For certificates,
- // we have to look up the underlying key algorithm that SSH
- // uses to evaluate signatures.
- underlyingAlgo := algo
- for sigAlgo, certAlgo := range certAlgoNames {
- if certAlgo == algo {
- underlyingAlgo = sigAlgo
- }
- }
- if sig.Format != underlyingAlgo {
- return fmt.Errorf("ssh: invalid signature algorithm %q, expected %q", sig.Format, underlyingAlgo)
+ if a := underlyingAlgo(algo); sig.Format != a {
+ return fmt.Errorf("ssh: invalid signature algorithm %q, expected %q", sig.Format, a)
}
return hostKey.Verify(result.H, sig)
@@ -237,11 +228,11 @@ type ClientConfig struct {
// be used for the connection. If empty, a reasonable default is used.
ClientVersion string
- // HostKeyAlgorithms lists the key types that the client will
- // accept from the server as host key, in order of
+ // HostKeyAlgorithms lists the public key algorithms that the client will
+ // accept from the server for host key authentication, in order of
// preference. If empty, a reasonable default is used. Any
- // string returned from PublicKey.Type method may be used, or
- // any of the CertAlgoXxxx and KeyAlgoXxxx constants.
+ // string returned from a PublicKey.Type method may be used, or
+ // any of the CertAlgo and KeyAlgo constants.
HostKeyAlgorithms []string
// Timeout is the maximum amount of time for the TCP connection to establish.
diff --git a/vendor/golang.org/x/crypto/ssh/client_auth.go b/vendor/golang.org/x/crypto/ssh/client_auth.go
index c611aeb6..409b5ea1 100644
--- a/vendor/golang.org/x/crypto/ssh/client_auth.go
+++ b/vendor/golang.org/x/crypto/ssh/client_auth.go
@@ -9,6 +9,7 @@ import (
"errors"
"fmt"
"io"
+ "strings"
)
type authResult int
@@ -29,6 +30,33 @@ func (c *connection) clientAuthenticate(config *ClientConfig) error {
if err != nil {
return err
}
+ // The server may choose to send a SSH_MSG_EXT_INFO at this point (if we
+ // advertised willingness to receive one, which we always do) or not. See
+ // RFC 8308, Section 2.4.
+ extensions := make(map[string][]byte)
+ if len(packet) > 0 && packet[0] == msgExtInfo {
+ var extInfo extInfoMsg
+ if err := Unmarshal(packet, &extInfo); err != nil {
+ return err
+ }
+ payload := extInfo.Payload
+ for i := uint32(0); i < extInfo.NumExtensions; i++ {
+ name, rest, ok := parseString(payload)
+ if !ok {
+ return parseError(msgExtInfo)
+ }
+ value, rest, ok := parseString(rest)
+ if !ok {
+ return parseError(msgExtInfo)
+ }
+ extensions[string(name)] = value
+ payload = rest
+ }
+ packet, err = c.transport.readPacket()
+ if err != nil {
+ return err
+ }
+ }
var serviceAccept serviceAcceptMsg
if err := Unmarshal(packet, &serviceAccept); err != nil {
return err
@@ -41,7 +69,7 @@ func (c *connection) clientAuthenticate(config *ClientConfig) error {
sessionID := c.transport.getSessionID()
for auth := AuthMethod(new(noneAuth)); auth != nil; {
- ok, methods, err := auth.auth(sessionID, config.User, c.transport, config.Rand)
+ ok, methods, err := auth.auth(sessionID, config.User, c.transport, config.Rand, extensions)
if err != nil {
return err
}
@@ -93,7 +121,7 @@ type AuthMethod interface {
// If authentication is not successful, a []string of alternative
// method names is returned. If the slice is nil, it will be ignored
// and the previous set of possible methods will be reused.
- auth(session []byte, user string, p packetConn, rand io.Reader) (authResult, []string, error)
+ auth(session []byte, user string, p packetConn, rand io.Reader, extensions map[string][]byte) (authResult, []string, error)
// method returns the RFC 4252 method name.
method() string
@@ -102,7 +130,7 @@ type AuthMethod interface {
// "none" authentication, RFC 4252 section 5.2.
type noneAuth int
-func (n *noneAuth) auth(session []byte, user string, c packetConn, rand io.Reader) (authResult, []string, error) {
+func (n *noneAuth) auth(session []byte, user string, c packetConn, rand io.Reader, _ map[string][]byte) (authResult, []string, error) {
if err := c.writePacket(Marshal(&userAuthRequestMsg{
User: user,
Service: serviceSSH,
@@ -122,7 +150,7 @@ func (n *noneAuth) method() string {
// a function call, e.g. by prompting the user.
type passwordCallback func() (password string, err error)
-func (cb passwordCallback) auth(session []byte, user string, c packetConn, rand io.Reader) (authResult, []string, error) {
+func (cb passwordCallback) auth(session []byte, user string, c packetConn, rand io.Reader, _ map[string][]byte) (authResult, []string, error) {
type passwordAuthMsg struct {
User string `sshtype:"50"`
Service string
@@ -189,7 +217,46 @@ func (cb publicKeyCallback) method() string {
return "publickey"
}
-func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand io.Reader) (authResult, []string, error) {
+func pickSignatureAlgorithm(signer Signer, extensions map[string][]byte) (as AlgorithmSigner, algo string) {
+ keyFormat := signer.PublicKey().Type()
+
+ // Like in sendKexInit, if the public key implements AlgorithmSigner we
+ // assume it supports all algorithms, otherwise only the key format one.
+ as, ok := signer.(AlgorithmSigner)
+ if !ok {
+ return algorithmSignerWrapper{signer}, keyFormat
+ }
+
+ extPayload, ok := extensions["server-sig-algs"]
+ if !ok {
+ // If there is no "server-sig-algs" extension, fall back to the key
+ // format algorithm.
+ return as, keyFormat
+ }
+
+ // The server-sig-algs extension only carries underlying signature
+ // algorithm, but we are trying to select a protocol-level public key
+ // algorithm, which might be a certificate type. Extend the list of server
+ // supported algorithms to include the corresponding certificate algorithms.
+ serverAlgos := strings.Split(string(extPayload), ",")
+ for _, algo := range serverAlgos {
+ if certAlgo, ok := certificateAlgo(algo); ok {
+ serverAlgos = append(serverAlgos, certAlgo)
+ }
+ }
+
+ keyAlgos := algorithmsForKeyFormat(keyFormat)
+ algo, err := findCommon("public key signature algorithm", keyAlgos, serverAlgos)
+ if err != nil {
+ // If there is no overlap, try the key anyway with the key format
+ // algorithm, to support servers that fail to list all supported
+ // algorithms.
+ return as, keyFormat
+ }
+ return as, algo
+}
+
+func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand io.Reader, extensions map[string][]byte) (authResult, []string, error) {
// Authentication is performed by sending an enquiry to test if a key is
// acceptable to the remote. If the key is acceptable, the client will
// attempt to authenticate with the valid key. If not the client will repeat
@@ -201,7 +268,10 @@ func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand
}
var methods []string
for _, signer := range signers {
- ok, err := validateKey(signer.PublicKey(), user, c)
+ pub := signer.PublicKey()
+ as, algo := pickSignatureAlgorithm(signer, extensions)
+
+ ok, err := validateKey(pub, algo, user, c)
if err != nil {
return authFailure, nil, err
}
@@ -209,13 +279,13 @@ func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand
continue
}
- pub := signer.PublicKey()
pubKey := pub.Marshal()
- sign, err := signer.Sign(rand, buildDataSignedForAuth(session, userAuthRequestMsg{
+ data := buildDataSignedForAuth(session, userAuthRequestMsg{
User: user,
Service: serviceSSH,
Method: cb.method(),
- }, []byte(pub.Type()), pubKey))
+ }, algo, pubKey)
+ sign, err := as.SignWithAlgorithm(rand, data, underlyingAlgo(algo))
if err != nil {
return authFailure, nil, err
}
@@ -229,7 +299,7 @@ func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand
Service: serviceSSH,
Method: cb.method(),
HasSig: true,
- Algoname: pub.Type(),
+ Algoname: algo,
PubKey: pubKey,
Sig: sig,
}
@@ -266,26 +336,25 @@ func containsMethod(methods []string, method string) bool {
}
// validateKey validates the key provided is acceptable to the server.
-func validateKey(key PublicKey, user string, c packetConn) (bool, error) {
+func validateKey(key PublicKey, algo string, user string, c packetConn) (bool, error) {
pubKey := key.Marshal()
msg := publickeyAuthMsg{
User: user,
Service: serviceSSH,
Method: "publickey",
HasSig: false,
- Algoname: key.Type(),
+ Algoname: algo,
PubKey: pubKey,
}
if err := c.writePacket(Marshal(&msg)); err != nil {
return false, err
}
- return confirmKeyAck(key, c)
+ return confirmKeyAck(key, algo, c)
}
-func confirmKeyAck(key PublicKey, c packetConn) (bool, error) {
+func confirmKeyAck(key PublicKey, algo string, c packetConn) (bool, error) {
pubKey := key.Marshal()
- algoname := key.Type()
for {
packet, err := c.readPacket()
@@ -302,14 +371,14 @@ func confirmKeyAck(key PublicKey, c packetConn) (bool, error) {
if err := Unmarshal(packet, &msg); err != nil {
return false, err
}
- if msg.Algo != algoname || !bytes.Equal(msg.PubKey, pubKey) {
+ if msg.Algo != algo || !bytes.Equal(msg.PubKey, pubKey) {
return false, nil
}
return true, nil
case msgUserAuthFailure:
return false, nil
default:
- return false, unexpectedMessageError(msgUserAuthSuccess, packet[0])
+ return false, unexpectedMessageError(msgUserAuthPubKeyOk, packet[0])
}
}
}
@@ -330,6 +399,7 @@ func PublicKeysCallback(getSigners func() (signers []Signer, err error)) AuthMet
// along with a list of remaining authentication methods to try next and
// an error if an unexpected response was received.
func handleAuthResponse(c packetConn) (authResult, []string, error) {
+ gotMsgExtInfo := false
for {
packet, err := c.readPacket()
if err != nil {
@@ -341,6 +411,12 @@ func handleAuthResponse(c packetConn) (authResult, []string, error) {
if err := handleBannerResponse(c, packet); err != nil {
return authFailure, nil, err
}
+ case msgExtInfo:
+ // Ignore post-authentication RFC 8308 extensions, once.
+ if gotMsgExtInfo {
+ return authFailure, nil, unexpectedMessageError(msgUserAuthSuccess, packet[0])
+ }
+ gotMsgExtInfo = true
case msgUserAuthFailure:
var msg userAuthFailureMsg
if err := Unmarshal(packet, &msg); err != nil {
@@ -380,10 +456,10 @@ func handleBannerResponse(c packetConn, packet []byte) error {
// disabling echoing (e.g. for passwords), and return all the answers.
// Challenge may be called multiple times in a single session. After
// successful authentication, the server may send a challenge with no
-// questions, for which the user and instruction messages should be
+// questions, for which the name and instruction messages should be
// printed. RFC 4256 section 3.3 details how the UI should behave for
// both CLI and GUI environments.
-type KeyboardInteractiveChallenge func(user, instruction string, questions []string, echos []bool) (answers []string, err error)
+type KeyboardInteractiveChallenge func(name, instruction string, questions []string, echos []bool) (answers []string, err error)
// KeyboardInteractive returns an AuthMethod using a prompt/response
// sequence controlled by the server.
@@ -395,7 +471,7 @@ func (cb KeyboardInteractiveChallenge) method() string {
return "keyboard-interactive"
}
-func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packetConn, rand io.Reader) (authResult, []string, error) {
+func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packetConn, rand io.Reader, _ map[string][]byte) (authResult, []string, error) {
type initiateMsg struct {
User string `sshtype:"50"`
Service string
@@ -412,6 +488,7 @@ func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packe
return authFailure, nil, err
}
+ gotMsgExtInfo := false
for {
packet, err := c.readPacket()
if err != nil {
@@ -425,6 +502,13 @@ func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packe
return authFailure, nil, err
}
continue
+ case msgExtInfo:
+ // Ignore post-authentication RFC 8308 extensions, once.
+ if gotMsgExtInfo {
+ return authFailure, nil, unexpectedMessageError(msgUserAuthInfoRequest, packet[0])
+ }
+ gotMsgExtInfo = true
+ continue
case msgUserAuthInfoRequest:
// OK
case msgUserAuthFailure:
@@ -465,7 +549,7 @@ func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packe
return authFailure, nil, errors.New("ssh: extra data following keyboard-interactive pairs")
}
- answers, err := cb(msg.User, msg.Instruction, prompts, echos)
+ answers, err := cb(msg.Name, msg.Instruction, prompts, echos)
if err != nil {
return authFailure, nil, err
}
@@ -497,9 +581,9 @@ type retryableAuthMethod struct {
maxTries int
}
-func (r *retryableAuthMethod) auth(session []byte, user string, c packetConn, rand io.Reader) (ok authResult, methods []string, err error) {
+func (r *retryableAuthMethod) auth(session []byte, user string, c packetConn, rand io.Reader, extensions map[string][]byte) (ok authResult, methods []string, err error) {
for i := 0; r.maxTries <= 0 || i < r.maxTries; i++ {
- ok, methods, err = r.authMethod.auth(session, user, c, rand)
+ ok, methods, err = r.authMethod.auth(session, user, c, rand, extensions)
if ok != authFailure || err != nil { // either success, partial success or error terminate
return ok, methods, err
}
@@ -542,7 +626,7 @@ type gssAPIWithMICCallback struct {
target string
}
-func (g *gssAPIWithMICCallback) auth(session []byte, user string, c packetConn, rand io.Reader) (authResult, []string, error) {
+func (g *gssAPIWithMICCallback) auth(session []byte, user string, c packetConn, rand io.Reader, _ map[string][]byte) (authResult, []string, error) {
m := &userAuthRequestMsg{
User: user,
Service: serviceSSH,
diff --git a/vendor/golang.org/x/crypto/ssh/common.go b/vendor/golang.org/x/crypto/ssh/common.go
index 5ae22757..2a47a61d 100644
--- a/vendor/golang.org/x/crypto/ssh/common.go
+++ b/vendor/golang.org/x/crypto/ssh/common.go
@@ -44,11 +44,11 @@ var preferredCiphers = []string{
// supportedKexAlgos specifies the supported key-exchange algorithms in
// preference order.
var supportedKexAlgos = []string{
- kexAlgoCurve25519SHA256,
+ kexAlgoCurve25519SHA256, kexAlgoCurve25519SHA256LibSSH,
// P384 and P521 are not constant-time yet, but since we don't
// reuse ephemeral keys, using them for ECDH should be OK.
kexAlgoECDH256, kexAlgoECDH384, kexAlgoECDH521,
- kexAlgoDH14SHA1, kexAlgoDH1SHA1,
+ kexAlgoDH14SHA256, kexAlgoDH14SHA1, kexAlgoDH1SHA1,
}
// serverForbiddenKexAlgos contains key exchange algorithms, that are forbidden
@@ -61,21 +61,21 @@ var serverForbiddenKexAlgos = map[string]struct{}{
// preferredKexAlgos specifies the default preference for key-exchange algorithms
// in preference order.
var preferredKexAlgos = []string{
- kexAlgoCurve25519SHA256,
+ kexAlgoCurve25519SHA256, kexAlgoCurve25519SHA256LibSSH,
kexAlgoECDH256, kexAlgoECDH384, kexAlgoECDH521,
- kexAlgoDH14SHA1,
+ kexAlgoDH14SHA256, kexAlgoDH14SHA1,
}
// supportedHostKeyAlgos specifies the supported host-key algorithms (i.e. methods
// of authenticating servers) in preference order.
var supportedHostKeyAlgos = []string{
- CertSigAlgoRSASHA2512v01, CertSigAlgoRSASHA2256v01,
- CertSigAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01,
+ CertAlgoRSASHA512v01, CertAlgoRSASHA256v01,
+ CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01,
CertAlgoECDSA384v01, CertAlgoECDSA521v01, CertAlgoED25519v01,
KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521,
- SigAlgoRSASHA2512, SigAlgoRSASHA2256,
- SigAlgoRSA, KeyAlgoDSA,
+ KeyAlgoRSASHA512, KeyAlgoRSASHA256,
+ KeyAlgoRSA, KeyAlgoDSA,
KeyAlgoED25519,
}
@@ -89,23 +89,33 @@ var supportedMACs = []string{
var supportedCompressions = []string{compressionNone}
-// hashFuncs keeps the mapping of supported algorithms to their respective
-// hashes needed for signature verification.
+// hashFuncs keeps the mapping of supported signature algorithms to their
+// respective hashes needed for signing and verification.
var hashFuncs = map[string]crypto.Hash{
- SigAlgoRSA: crypto.SHA1,
- SigAlgoRSASHA2256: crypto.SHA256,
- SigAlgoRSASHA2512: crypto.SHA512,
- KeyAlgoDSA: crypto.SHA1,
- KeyAlgoECDSA256: crypto.SHA256,
- KeyAlgoECDSA384: crypto.SHA384,
- KeyAlgoECDSA521: crypto.SHA512,
- CertSigAlgoRSAv01: crypto.SHA1,
- CertSigAlgoRSASHA2256v01: crypto.SHA256,
- CertSigAlgoRSASHA2512v01: crypto.SHA512,
- CertAlgoDSAv01: crypto.SHA1,
- CertAlgoECDSA256v01: crypto.SHA256,
- CertAlgoECDSA384v01: crypto.SHA384,
- CertAlgoECDSA521v01: crypto.SHA512,
+ KeyAlgoRSA: crypto.SHA1,
+ KeyAlgoRSASHA256: crypto.SHA256,
+ KeyAlgoRSASHA512: crypto.SHA512,
+ KeyAlgoDSA: crypto.SHA1,
+ KeyAlgoECDSA256: crypto.SHA256,
+ KeyAlgoECDSA384: crypto.SHA384,
+ KeyAlgoECDSA521: crypto.SHA512,
+ // KeyAlgoED25519 doesn't pre-hash.
+ KeyAlgoSKECDSA256: crypto.SHA256,
+ KeyAlgoSKED25519: crypto.SHA256,
+}
+
+// algorithmsForKeyFormat returns the supported signature algorithms for a given
+// public key format (PublicKey.Type), in order of preference. See RFC 8332,
+// Section 2. See also the note in sendKexInit on backwards compatibility.
+func algorithmsForKeyFormat(keyFormat string) []string {
+ switch keyFormat {
+ case KeyAlgoRSA:
+ return []string{KeyAlgoRSASHA256, KeyAlgoRSASHA512, KeyAlgoRSA}
+ case CertAlgoRSAv01:
+ return []string{CertAlgoRSASHA256v01, CertAlgoRSASHA512v01, CertAlgoRSAv01}
+ default:
+ return []string{keyFormat}
+ }
}
// unexpectedMessageError results when the SSH message that we received didn't
@@ -152,6 +162,11 @@ func (a *directionAlgorithms) rekeyBytes() int64 {
return 1 << 30
}
+var aeadCiphers = map[string]bool{
+ gcmCipherID: true,
+ chacha20Poly1305ID: true,
+}
+
type algorithms struct {
kex string
hostKey string
@@ -187,14 +202,18 @@ func findAgreedAlgorithms(isClient bool, clientKexInit, serverKexInit *kexInitMs
return
}
- ctos.MAC, err = findCommon("client to server MAC", clientKexInit.MACsClientServer, serverKexInit.MACsClientServer)
- if err != nil {
- return
+ if !aeadCiphers[ctos.Cipher] {
+ ctos.MAC, err = findCommon("client to server MAC", clientKexInit.MACsClientServer, serverKexInit.MACsClientServer)
+ if err != nil {
+ return
+ }
}
- stoc.MAC, err = findCommon("server to client MAC", clientKexInit.MACsServerClient, serverKexInit.MACsServerClient)
- if err != nil {
- return
+ if !aeadCiphers[stoc.Cipher] {
+ stoc.MAC, err = findCommon("server to client MAC", clientKexInit.MACsServerClient, serverKexInit.MACsServerClient)
+ if err != nil {
+ return
+ }
}
ctos.Compression, err = findCommon("client to server compression", clientKexInit.CompressionClientServer, serverKexInit.CompressionClientServer)
@@ -278,8 +297,9 @@ func (c *Config) SetDefaults() {
}
// buildDataSignedForAuth returns the data that is signed in order to prove
-// possession of a private key. See RFC 4252, section 7.
-func buildDataSignedForAuth(sessionID []byte, req userAuthRequestMsg, algo, pubKey []byte) []byte {
+// possession of a private key. See RFC 4252, section 7. algo is the advertised
+// algorithm, and may be a certificate type.
+func buildDataSignedForAuth(sessionID []byte, req userAuthRequestMsg, algo string, pubKey []byte) []byte {
data := struct {
Session []byte
Type byte
@@ -287,7 +307,7 @@ func buildDataSignedForAuth(sessionID []byte, req userAuthRequestMsg, algo, pubK
Service string
Method string
Sign bool
- Algo []byte
+ Algo string
PubKey []byte
}{
sessionID,
diff --git a/vendor/golang.org/x/crypto/ssh/handshake.go b/vendor/golang.org/x/crypto/ssh/handshake.go
index 05ad49c3..f815cdb4 100644
--- a/vendor/golang.org/x/crypto/ssh/handshake.go
+++ b/vendor/golang.org/x/crypto/ssh/handshake.go
@@ -455,21 +455,36 @@ func (t *handshakeTransport) sendKexInit() error {
}
io.ReadFull(rand.Reader, msg.Cookie[:])
- if len(t.hostKeys) > 0 {
+ isServer := len(t.hostKeys) > 0
+ if isServer {
for _, k := range t.hostKeys {
- algo := k.PublicKey().Type()
- switch algo {
- case KeyAlgoRSA:
- msg.ServerHostKeyAlgos = append(msg.ServerHostKeyAlgos, []string{SigAlgoRSASHA2512, SigAlgoRSASHA2256, SigAlgoRSA}...)
- case CertAlgoRSAv01:
- msg.ServerHostKeyAlgos = append(msg.ServerHostKeyAlgos, []string{CertSigAlgoRSASHA2512v01, CertSigAlgoRSASHA2256v01, CertSigAlgoRSAv01}...)
- default:
- msg.ServerHostKeyAlgos = append(msg.ServerHostKeyAlgos, algo)
+ // If k is an AlgorithmSigner, presume it supports all signature algorithms
+ // associated with the key format. (Ideally AlgorithmSigner would have a
+ // method to advertise supported algorithms, but it doesn't. This means that
+ // adding support for a new algorithm is a breaking change, as we will
+ // immediately negotiate it even if existing implementations don't support
+ // it. If that ever happens, we'll have to figure something out.)
+ // If k is not an AlgorithmSigner, we can only assume it only supports the
+ // algorithms that matches the key format. (This means that Sign can't pick
+ // a different default.)
+ keyFormat := k.PublicKey().Type()
+ if _, ok := k.(AlgorithmSigner); ok {
+ msg.ServerHostKeyAlgos = append(msg.ServerHostKeyAlgos, algorithmsForKeyFormat(keyFormat)...)
+ } else {
+ msg.ServerHostKeyAlgos = append(msg.ServerHostKeyAlgos, keyFormat)
}
}
} else {
msg.ServerHostKeyAlgos = t.hostKeyAlgorithms
+
+ // As a client we opt in to receiving SSH_MSG_EXT_INFO so we know what
+ // algorithms the server supports for public key authentication. See RFC
+ // 8303, Section 2.1.
+ msg.KexAlgos = make([]string, 0, len(t.config.KeyExchanges)+1)
+ msg.KexAlgos = append(msg.KexAlgos, t.config.KeyExchanges...)
+ msg.KexAlgos = append(msg.KexAlgos, "ext-info-c")
}
+
packet := Marshal(msg)
// writePacket destroys the contents, so save a copy.
@@ -589,9 +604,9 @@ func (t *handshakeTransport) enterKeyExchange(otherInitPacket []byte) error {
var result *kexResult
if len(t.hostKeys) > 0 {
- result, err = t.server(kex, t.algorithms, &magics)
+ result, err = t.server(kex, &magics)
} else {
- result, err = t.client(kex, t.algorithms, &magics)
+ result, err = t.client(kex, &magics)
}
if err != nil {
@@ -618,33 +633,52 @@ func (t *handshakeTransport) enterKeyExchange(otherInitPacket []byte) error {
return nil
}
-func (t *handshakeTransport) server(kex kexAlgorithm, algs *algorithms, magics *handshakeMagics) (*kexResult, error) {
- var hostKey Signer
- for _, k := range t.hostKeys {
- kt := k.PublicKey().Type()
- if kt == algs.hostKey {
- hostKey = k
- } else if signer, ok := k.(AlgorithmSigner); ok {
- // Some signature algorithms don't show up as key types
- // so we have to manually check for a compatible host key.
- switch kt {
- case KeyAlgoRSA:
- if algs.hostKey == SigAlgoRSASHA2256 || algs.hostKey == SigAlgoRSASHA2512 {
- hostKey = &rsaSigner{signer, algs.hostKey}
- }
- case CertAlgoRSAv01:
- if algs.hostKey == CertSigAlgoRSASHA2256v01 || algs.hostKey == CertSigAlgoRSASHA2512v01 {
- hostKey = &rsaSigner{signer, certToPrivAlgo(algs.hostKey)}
- }
+// algorithmSignerWrapper is an AlgorithmSigner that only supports the default
+// key format algorithm.
+//
+// This is technically a violation of the AlgorithmSigner interface, but it
+// should be unreachable given where we use this. Anyway, at least it returns an
+// error instead of panicing or producing an incorrect signature.
+type algorithmSignerWrapper struct {
+ Signer
+}
+
+func (a algorithmSignerWrapper) SignWithAlgorithm(rand io.Reader, data []byte, algorithm string) (*Signature, error) {
+ if algorithm != underlyingAlgo(a.PublicKey().Type()) {
+ return nil, errors.New("ssh: internal error: algorithmSignerWrapper invoked with non-default algorithm")
+ }
+ return a.Sign(rand, data)
+}
+
+func pickHostKey(hostKeys []Signer, algo string) AlgorithmSigner {
+ for _, k := range hostKeys {
+ if algo == k.PublicKey().Type() {
+ return algorithmSignerWrapper{k}
+ }
+ k, ok := k.(AlgorithmSigner)
+ if !ok {
+ continue
+ }
+ for _, a := range algorithmsForKeyFormat(k.PublicKey().Type()) {
+ if algo == a {
+ return k
}
}
}
+ return nil
+}
+
+func (t *handshakeTransport) server(kex kexAlgorithm, magics *handshakeMagics) (*kexResult, error) {
+ hostKey := pickHostKey(t.hostKeys, t.algorithms.hostKey)
+ if hostKey == nil {
+ return nil, errors.New("ssh: internal error: negotiated unsupported signature type")
+ }
- r, err := kex.Server(t.conn, t.config.Rand, magics, hostKey)
+ r, err := kex.Server(t.conn, t.config.Rand, magics, hostKey, t.algorithms.hostKey)
return r, err
}
-func (t *handshakeTransport) client(kex kexAlgorithm, algs *algorithms, magics *handshakeMagics) (*kexResult, error) {
+func (t *handshakeTransport) client(kex kexAlgorithm, magics *handshakeMagics) (*kexResult, error) {
result, err := kex.Client(t.conn, t.config.Rand, magics)
if err != nil {
return nil, err
@@ -655,7 +689,7 @@ func (t *handshakeTransport) client(kex kexAlgorithm, algs *algorithms, magics *
return nil, err
}
- if err := verifyHostKeySignature(hostKey, algs.hostKey, result); err != nil {
+ if err := verifyHostKeySignature(hostKey, t.algorithms.hostKey, result); err != nil {
return nil, err
}
diff --git a/vendor/golang.org/x/crypto/ssh/kex.go b/vendor/golang.org/x/crypto/ssh/kex.go
index 766e9293..927a90cd 100644
--- a/vendor/golang.org/x/crypto/ssh/kex.go
+++ b/vendor/golang.org/x/crypto/ssh/kex.go
@@ -20,12 +20,14 @@ import (
)
const (
- kexAlgoDH1SHA1 = "diffie-hellman-group1-sha1"
- kexAlgoDH14SHA1 = "diffie-hellman-group14-sha1"
- kexAlgoECDH256 = "ecdh-sha2-nistp256"
- kexAlgoECDH384 = "ecdh-sha2-nistp384"
- kexAlgoECDH521 = "ecdh-sha2-nistp521"
- kexAlgoCurve25519SHA256 = "curve25519-sha256@libssh.org"
+ kexAlgoDH1SHA1 = "diffie-hellman-group1-sha1"
+ kexAlgoDH14SHA1 = "diffie-hellman-group14-sha1"
+ kexAlgoDH14SHA256 = "diffie-hellman-group14-sha256"
+ kexAlgoECDH256 = "ecdh-sha2-nistp256"
+ kexAlgoECDH384 = "ecdh-sha2-nistp384"
+ kexAlgoECDH521 = "ecdh-sha2-nistp521"
+ kexAlgoCurve25519SHA256LibSSH = "curve25519-sha256@libssh.org"
+ kexAlgoCurve25519SHA256 = "curve25519-sha256"
// For the following kex only the client half contains a production
// ready implementation. The server half only consists of a minimal
@@ -75,8 +77,9 @@ func (m *handshakeMagics) write(w io.Writer) {
// kexAlgorithm abstracts different key exchange algorithms.
type kexAlgorithm interface {
// Server runs server-side key agreement, signing the result
- // with a hostkey.
- Server(p packetConn, rand io.Reader, magics *handshakeMagics, s Signer) (*kexResult, error)
+ // with a hostkey. algo is the negotiated algorithm, and may
+ // be a certificate type.
+ Server(p packetConn, rand io.Reader, magics *handshakeMagics, s AlgorithmSigner, algo string) (*kexResult, error)
// Client runs the client-side key agreement. Caller is
// responsible for verifying the host key signature.
@@ -86,6 +89,7 @@ type kexAlgorithm interface {
// dhGroup is a multiplicative group suitable for implementing Diffie-Hellman key agreement.
type dhGroup struct {
g, p, pMinus1 *big.Int
+ hashFunc crypto.Hash
}
func (group *dhGroup) diffieHellman(theirPublic, myPrivate *big.Int) (*big.Int, error) {
@@ -96,8 +100,6 @@ func (group *dhGroup) diffieHellman(theirPublic, myPrivate *big.Int) (*big.Int,
}
func (group *dhGroup) Client(c packetConn, randSource io.Reader, magics *handshakeMagics) (*kexResult, error) {
- hashFunc := crypto.SHA1
-
var x *big.Int
for {
var err error
@@ -132,7 +134,7 @@ func (group *dhGroup) Client(c packetConn, randSource io.Reader, magics *handsha
return nil, err
}
- h := hashFunc.New()
+ h := group.hashFunc.New()
magics.write(h)
writeString(h, kexDHReply.HostKey)
writeInt(h, X)
@@ -146,12 +148,11 @@ func (group *dhGroup) Client(c packetConn, randSource io.Reader, magics *handsha
K: K,
HostKey: kexDHReply.HostKey,
Signature: kexDHReply.Signature,
- Hash: crypto.SHA1,
+ Hash: group.hashFunc,
}, nil
}
-func (group *dhGroup) Server(c packetConn, randSource io.Reader, magics *handshakeMagics, priv Signer) (result *kexResult, err error) {
- hashFunc := crypto.SHA1
+func (group *dhGroup) Server(c packetConn, randSource io.Reader, magics *handshakeMagics, priv AlgorithmSigner, algo string) (result *kexResult, err error) {
packet, err := c.readPacket()
if err != nil {
return
@@ -179,7 +180,7 @@ func (group *dhGroup) Server(c packetConn, randSource io.Reader, magics *handsha
hostKeyBytes := priv.PublicKey().Marshal()
- h := hashFunc.New()
+ h := group.hashFunc.New()
magics.write(h)
writeString(h, hostKeyBytes)
writeInt(h, kexDHInit.X)
@@ -193,7 +194,7 @@ func (group *dhGroup) Server(c packetConn, randSource io.Reader, magics *handsha
// H is already a hash, but the hostkey signing will apply its
// own key-specific hash algorithm.
- sig, err := signAndMarshal(priv, randSource, H)
+ sig, err := signAndMarshal(priv, randSource, H, algo)
if err != nil {
return nil, err
}
@@ -211,7 +212,7 @@ func (group *dhGroup) Server(c packetConn, randSource io.Reader, magics *handsha
K: K,
HostKey: hostKeyBytes,
Signature: sig,
- Hash: crypto.SHA1,
+ Hash: group.hashFunc,
}, err
}
@@ -314,7 +315,7 @@ func validateECPublicKey(curve elliptic.Curve, x, y *big.Int) bool {
return true
}
-func (kex *ecdh) Server(c packetConn, rand io.Reader, magics *handshakeMagics, priv Signer) (result *kexResult, err error) {
+func (kex *ecdh) Server(c packetConn, rand io.Reader, magics *handshakeMagics, priv AlgorithmSigner, algo string) (result *kexResult, err error) {
packet, err := c.readPacket()
if err != nil {
return nil, err
@@ -359,7 +360,7 @@ func (kex *ecdh) Server(c packetConn, rand io.Reader, magics *handshakeMagics, p
// H is already a hash, but the hostkey signing will apply its
// own key-specific hash algorithm.
- sig, err := signAndMarshal(priv, rand, H)
+ sig, err := signAndMarshal(priv, rand, H, algo)
if err != nil {
return nil, err
}
@@ -384,39 +385,62 @@ func (kex *ecdh) Server(c packetConn, rand io.Reader, magics *handshakeMagics, p
}, nil
}
+// ecHash returns the hash to match the given elliptic curve, see RFC
+// 5656, section 6.2.1
+func ecHash(curve elliptic.Curve) crypto.Hash {
+ bitSize := curve.Params().BitSize
+ switch {
+ case bitSize <= 256:
+ return crypto.SHA256
+ case bitSize <= 384:
+ return crypto.SHA384
+ }
+ return crypto.SHA512
+}
+
var kexAlgoMap = map[string]kexAlgorithm{}
func init() {
- // This is the group called diffie-hellman-group1-sha1 in RFC
- // 4253 and Oakley Group 2 in RFC 2409.
+ // This is the group called diffie-hellman-group1-sha1 in
+ // RFC 4253 and Oakley Group 2 in RFC 2409.
p, _ := new(big.Int).SetString("FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF", 16)
kexAlgoMap[kexAlgoDH1SHA1] = &dhGroup{
- g: new(big.Int).SetInt64(2),
- p: p,
- pMinus1: new(big.Int).Sub(p, bigOne),
+ g: new(big.Int).SetInt64(2),
+ p: p,
+ pMinus1: new(big.Int).Sub(p, bigOne),
+ hashFunc: crypto.SHA1,
}
- // This is the group called diffie-hellman-group14-sha1 in RFC
- // 4253 and Oakley Group 14 in RFC 3526.
+ // This are the groups called diffie-hellman-group14-sha1 and
+ // diffie-hellman-group14-sha256 in RFC 4253 and RFC 8268,
+ // and Oakley Group 14 in RFC 3526.
p, _ = new(big.Int).SetString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
-
- kexAlgoMap[kexAlgoDH14SHA1] = &dhGroup{
+ group14 := &dhGroup{
g: new(big.Int).SetInt64(2),
p: p,
pMinus1: new(big.Int).Sub(p, bigOne),
}
+ kexAlgoMap[kexAlgoDH14SHA1] = &dhGroup{
+ g: group14.g, p: group14.p, pMinus1: group14.pMinus1,
+ hashFunc: crypto.SHA1,
+ }
+ kexAlgoMap[kexAlgoDH14SHA256] = &dhGroup{
+ g: group14.g, p: group14.p, pMinus1: group14.pMinus1,
+ hashFunc: crypto.SHA256,
+ }
+
kexAlgoMap[kexAlgoECDH521] = &ecdh{elliptic.P521()}
kexAlgoMap[kexAlgoECDH384] = &ecdh{elliptic.P384()}
kexAlgoMap[kexAlgoECDH256] = &ecdh{elliptic.P256()}
kexAlgoMap[kexAlgoCurve25519SHA256] = &curve25519sha256{}
+ kexAlgoMap[kexAlgoCurve25519SHA256LibSSH] = &curve25519sha256{}
kexAlgoMap[kexAlgoDHGEXSHA1] = &dhGEXSHA{hashFunc: crypto.SHA1}
kexAlgoMap[kexAlgoDHGEXSHA256] = &dhGEXSHA{hashFunc: crypto.SHA256}
}
-// curve25519sha256 implements the curve25519-sha256@libssh.org key
-// agreement protocol, as described in
-// https://git.libssh.org/projects/libssh.git/tree/doc/curve25519-sha256@libssh.org.txt
+// curve25519sha256 implements the curve25519-sha256 (formerly known as
+// curve25519-sha256@libssh.org) key exchange method, as described in RFC 8731.
type curve25519sha256 struct{}
type curve25519KeyPair struct {
@@ -486,7 +510,7 @@ func (kex *curve25519sha256) Client(c packetConn, rand io.Reader, magics *handsh
}, nil
}
-func (kex *curve25519sha256) Server(c packetConn, rand io.Reader, magics *handshakeMagics, priv Signer) (result *kexResult, err error) {
+func (kex *curve25519sha256) Server(c packetConn, rand io.Reader, magics *handshakeMagics, priv AlgorithmSigner, algo string) (result *kexResult, err error) {
packet, err := c.readPacket()
if err != nil {
return
@@ -527,7 +551,7 @@ func (kex *curve25519sha256) Server(c packetConn, rand io.Reader, magics *handsh
H := h.Sum(nil)
- sig, err := signAndMarshal(priv, rand, H)
+ sig, err := signAndMarshal(priv, rand, H, algo)
if err != nil {
return nil, err
}
@@ -553,7 +577,6 @@ func (kex *curve25519sha256) Server(c packetConn, rand io.Reader, magics *handsh
// diffie-hellman-group-exchange-sha256 key agreement protocols,
// as described in RFC 4419
type dhGEXSHA struct {
- g, p *big.Int
hashFunc crypto.Hash
}
@@ -563,14 +586,7 @@ const (
dhGroupExchangeMaximumBits = 8192
)
-func (gex *dhGEXSHA) diffieHellman(theirPublic, myPrivate *big.Int) (*big.Int, error) {
- if theirPublic.Sign() <= 0 || theirPublic.Cmp(gex.p) >= 0 {
- return nil, fmt.Errorf("ssh: DH parameter out of bounds")
- }
- return new(big.Int).Exp(theirPublic, myPrivate, gex.p), nil
-}
-
-func (gex dhGEXSHA) Client(c packetConn, randSource io.Reader, magics *handshakeMagics) (*kexResult, error) {
+func (gex *dhGEXSHA) Client(c packetConn, randSource io.Reader, magics *handshakeMagics) (*kexResult, error) {
// Send GexRequest
kexDHGexRequest := kexDHGexRequestMsg{
MinBits: dhGroupExchangeMinimumBits,
@@ -587,35 +603,29 @@ func (gex dhGEXSHA) Client(c packetConn, randSource io.Reader, magics *handshake
return nil, err
}
- var kexDHGexGroup kexDHGexGroupMsg
- if err = Unmarshal(packet, &kexDHGexGroup); err != nil {
+ var msg kexDHGexGroupMsg
+ if err = Unmarshal(packet, &msg); err != nil {
return nil, err
}
// reject if p's bit length < dhGroupExchangeMinimumBits or > dhGroupExchangeMaximumBits
- if kexDHGexGroup.P.BitLen() < dhGroupExchangeMinimumBits || kexDHGexGroup.P.BitLen() > dhGroupExchangeMaximumBits {
- return nil, fmt.Errorf("ssh: server-generated gex p is out of range (%d bits)", kexDHGexGroup.P.BitLen())
+ if msg.P.BitLen() < dhGroupExchangeMinimumBits || msg.P.BitLen() > dhGroupExchangeMaximumBits {
+ return nil, fmt.Errorf("ssh: server-generated gex p is out of range (%d bits)", msg.P.BitLen())
}
- gex.p = kexDHGexGroup.P
- gex.g = kexDHGexGroup.G
-
- // Check if g is safe by verifing that g > 1 and g < p - 1
- one := big.NewInt(1)
- var pMinusOne = &big.Int{}
- pMinusOne.Sub(gex.p, one)
- if gex.g.Cmp(one) != 1 && gex.g.Cmp(pMinusOne) != -1 {
+ // Check if g is safe by verifying that 1 < g < p-1
+ pMinusOne := new(big.Int).Sub(msg.P, bigOne)
+ if msg.G.Cmp(bigOne) <= 0 || msg.G.Cmp(pMinusOne) >= 0 {
return nil, fmt.Errorf("ssh: server provided gex g is not safe")
}
// Send GexInit
- var pHalf = &big.Int{}
- pHalf.Rsh(gex.p, 1)
+ pHalf := new(big.Int).Rsh(msg.P, 1)
x, err := rand.Int(randSource, pHalf)
if err != nil {
return nil, err
}
- X := new(big.Int).Exp(gex.g, x, gex.p)
+ X := new(big.Int).Exp(msg.G, x, msg.P)
kexDHGexInit := kexDHGexInitMsg{
X: X,
}
@@ -634,13 +644,13 @@ func (gex dhGEXSHA) Client(c packetConn, randSource io.Reader, magics *handshake
return nil, err
}
- kInt, err := gex.diffieHellman(kexDHGexReply.Y, x)
- if err != nil {
- return nil, err
+ if kexDHGexReply.Y.Cmp(bigOne) <= 0 || kexDHGexReply.Y.Cmp(pMinusOne) >= 0 {
+ return nil, errors.New("ssh: DH parameter out of bounds")
}
+ kInt := new(big.Int).Exp(kexDHGexReply.Y, x, msg.P)
- // Check if k is safe by verifing that k > 1 and k < p - 1
- if kInt.Cmp(one) != 1 && kInt.Cmp(pMinusOne) != -1 {
+ // Check if k is safe by verifying that k > 1 and k < p - 1
+ if kInt.Cmp(bigOne) <= 0 || kInt.Cmp(pMinusOne) >= 0 {
return nil, fmt.Errorf("ssh: derived k is not safe")
}
@@ -650,8 +660,8 @@ func (gex dhGEXSHA) Client(c packetConn, randSource io.Reader, magics *handshake
binary.Write(h, binary.BigEndian, uint32(dhGroupExchangeMinimumBits))
binary.Write(h, binary.BigEndian, uint32(dhGroupExchangePreferredBits))
binary.Write(h, binary.BigEndian, uint32(dhGroupExchangeMaximumBits))
- writeInt(h, gex.p)
- writeInt(h, gex.g)
+ writeInt(h, msg.P)
+ writeInt(h, msg.G)
writeInt(h, X)
writeInt(h, kexDHGexReply.Y)
K := make([]byte, intLength(kInt))
@@ -670,7 +680,7 @@ func (gex dhGEXSHA) Client(c packetConn, randSource io.Reader, magics *handshake
// Server half implementation of the Diffie Hellman Key Exchange with SHA1 and SHA256.
//
// This is a minimal implementation to satisfy the automated tests.
-func (gex dhGEXSHA) Server(c packetConn, randSource io.Reader, magics *handshakeMagics, priv Signer) (result *kexResult, err error) {
+func (gex dhGEXSHA) Server(c packetConn, randSource io.Reader, magics *handshakeMagics, priv AlgorithmSigner, algo string) (result *kexResult, err error) {
// Receive GexRequest
packet, err := c.readPacket()
if err != nil {
@@ -681,35 +691,17 @@ func (gex dhGEXSHA) Server(c packetConn, randSource io.Reader, magics *handshake
return
}
- // smoosh the user's preferred size into our own limits
- if kexDHGexRequest.PreferedBits > dhGroupExchangeMaximumBits {
- kexDHGexRequest.PreferedBits = dhGroupExchangeMaximumBits
- }
- if kexDHGexRequest.PreferedBits < dhGroupExchangeMinimumBits {
- kexDHGexRequest.PreferedBits = dhGroupExchangeMinimumBits
- }
- // fix min/max if they're inconsistent. technically, we could just pout
- // and hang up, but there's no harm in giving them the benefit of the
- // doubt and just picking a bitsize for them.
- if kexDHGexRequest.MinBits > kexDHGexRequest.PreferedBits {
- kexDHGexRequest.MinBits = kexDHGexRequest.PreferedBits
- }
- if kexDHGexRequest.MaxBits < kexDHGexRequest.PreferedBits {
- kexDHGexRequest.MaxBits = kexDHGexRequest.PreferedBits
- }
-
// Send GexGroup
// This is the group called diffie-hellman-group14-sha1 in RFC
// 4253 and Oakley Group 14 in RFC 3526.
p, _ := new(big.Int).SetString("FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3BE39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF6955817183995497CEA956AE515D2261898FA051015728E5A8AACAA68FFFFFFFFFFFFFFFF", 16)
- gex.p = p
- gex.g = big.NewInt(2)
+ g := big.NewInt(2)
- kexDHGexGroup := kexDHGexGroupMsg{
- P: gex.p,
- G: gex.g,
+ msg := &kexDHGexGroupMsg{
+ P: p,
+ G: g,
}
- if err := c.writePacket(Marshal(&kexDHGexGroup)); err != nil {
+ if err := c.writePacket(Marshal(msg)); err != nil {
return nil, err
}
@@ -723,19 +715,19 @@ func (gex dhGEXSHA) Server(c packetConn, randSource io.Reader, magics *handshake
return
}
- var pHalf = &big.Int{}
- pHalf.Rsh(gex.p, 1)
+ pHalf := new(big.Int).Rsh(p, 1)
y, err := rand.Int(randSource, pHalf)
if err != nil {
return
}
+ Y := new(big.Int).Exp(g, y, p)
- Y := new(big.Int).Exp(gex.g, y, gex.p)
- kInt, err := gex.diffieHellman(kexDHGexInit.X, y)
- if err != nil {
- return nil, err
+ pMinusOne := new(big.Int).Sub(p, bigOne)
+ if kexDHGexInit.X.Cmp(bigOne) <= 0 || kexDHGexInit.X.Cmp(pMinusOne) >= 0 {
+ return nil, errors.New("ssh: DH parameter out of bounds")
}
+ kInt := new(big.Int).Exp(kexDHGexInit.X, y, p)
hostKeyBytes := priv.PublicKey().Marshal()
@@ -745,8 +737,8 @@ func (gex dhGEXSHA) Server(c packetConn, randSource io.Reader, magics *handshake
binary.Write(h, binary.BigEndian, uint32(dhGroupExchangeMinimumBits))
binary.Write(h, binary.BigEndian, uint32(dhGroupExchangePreferredBits))
binary.Write(h, binary.BigEndian, uint32(dhGroupExchangeMaximumBits))
- writeInt(h, gex.p)
- writeInt(h, gex.g)
+ writeInt(h, p)
+ writeInt(h, g)
writeInt(h, kexDHGexInit.X)
writeInt(h, Y)
@@ -758,7 +750,7 @@ func (gex dhGEXSHA) Server(c packetConn, randSource io.Reader, magics *handshake
// H is already a hash, but the hostkey signing will apply its
// own key-specific hash algorithm.
- sig, err := signAndMarshal(priv, randSource, H)
+ sig, err := signAndMarshal(priv, randSource, H, algo)
if err != nil {
return nil, err
}
diff --git a/vendor/golang.org/x/crypto/ssh/keys.go b/vendor/golang.org/x/crypto/ssh/keys.go
index c67d3a31..1c7de1a6 100644
--- a/vendor/golang.org/x/crypto/ssh/keys.go
+++ b/vendor/golang.org/x/crypto/ssh/keys.go
@@ -30,8 +30,9 @@ import (
"golang.org/x/crypto/ssh/internal/bcrypt_pbkdf"
)
-// These constants represent the algorithm names for key types supported by this
-// package.
+// Public key algorithms names. These values can appear in PublicKey.Type,
+// ClientConfig.HostKeyAlgorithms, Signature.Format, or as AlgorithmSigner
+// arguments.
const (
KeyAlgoRSA = "ssh-rsa"
KeyAlgoDSA = "ssh-dss"
@@ -41,16 +42,21 @@ const (
KeyAlgoECDSA521 = "ecdsa-sha2-nistp521"
KeyAlgoED25519 = "ssh-ed25519"
KeyAlgoSKED25519 = "sk-ssh-ed25519@openssh.com"
+
+ // KeyAlgoRSASHA256 and KeyAlgoRSASHA512 are only public key algorithms, not
+ // public key formats, so they can't appear as a PublicKey.Type. The
+ // corresponding PublicKey.Type is KeyAlgoRSA. See RFC 8332, Section 2.
+ KeyAlgoRSASHA256 = "rsa-sha2-256"
+ KeyAlgoRSASHA512 = "rsa-sha2-512"
)
-// These constants represent non-default signature algorithms that are supported
-// as algorithm parameters to AlgorithmSigner.SignWithAlgorithm methods. See
-// [PROTOCOL.agent] section 4.5.1 and
-// https://tools.ietf.org/html/draft-ietf-curdle-rsa-sha2-10
const (
- SigAlgoRSA = "ssh-rsa"
- SigAlgoRSASHA2256 = "rsa-sha2-256"
- SigAlgoRSASHA2512 = "rsa-sha2-512"
+ // Deprecated: use KeyAlgoRSA.
+ SigAlgoRSA = KeyAlgoRSA
+ // Deprecated: use KeyAlgoRSASHA256.
+ SigAlgoRSASHA2256 = KeyAlgoRSASHA256
+ // Deprecated: use KeyAlgoRSASHA512.
+ SigAlgoRSASHA2512 = KeyAlgoRSASHA512
)
// parsePubKey parses a public key of the given algorithm.
@@ -70,7 +76,7 @@ func parsePubKey(in []byte, algo string) (pubKey PublicKey, rest []byte, err err
case KeyAlgoSKED25519:
return parseSKEd25519(in)
case CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01, CertAlgoSKECDSA256v01, CertAlgoED25519v01, CertAlgoSKED25519v01:
- cert, err := parseCert(in, certToPrivAlgo(algo))
+ cert, err := parseCert(in, certKeyAlgoNames[algo])
if err != nil {
return nil, nil, err
}
@@ -289,18 +295,21 @@ func MarshalAuthorizedKey(key PublicKey) []byte {
return b.Bytes()
}
-// PublicKey is an abstraction of different types of public keys.
+// PublicKey represents a public key using an unspecified algorithm.
+//
+// Some PublicKeys provided by this package also implement CryptoPublicKey.
type PublicKey interface {
- // Type returns the key's type, e.g. "ssh-rsa".
+ // Type returns the key format name, e.g. "ssh-rsa".
Type() string
- // Marshal returns the serialized key data in SSH wire format,
- // with the name prefix. To unmarshal the returned data, use
- // the ParsePublicKey function.
+ // Marshal returns the serialized key data in SSH wire format, with the name
+ // prefix. To unmarshal the returned data, use the ParsePublicKey function.
Marshal() []byte
- // Verify that sig is a signature on the given data using this
- // key. This function will hash the data appropriately first.
+ // Verify that sig is a signature on the given data using this key. This
+ // method will hash the data appropriately first. sig.Format is allowed to
+ // be any signature algorithm compatible with the key type, the caller
+ // should check if it has more stringent requirements.
Verify(data []byte, sig *Signature) error
}
@@ -311,25 +320,32 @@ type CryptoPublicKey interface {
}
// A Signer can create signatures that verify against a public key.
+//
+// Some Signers provided by this package also implement AlgorithmSigner.
type Signer interface {
- // PublicKey returns an associated PublicKey instance.
+ // PublicKey returns the associated PublicKey.
PublicKey() PublicKey
- // Sign returns raw signature for the given data. This method
- // will apply the hash specified for the keytype to the data.
+ // Sign returns a signature for the given data. This method will hash the
+ // data appropriately first. The signature algorithm is expected to match
+ // the key format returned by the PublicKey.Type method (and not to be any
+ // alternative algorithm supported by the key format).
Sign(rand io.Reader, data []byte) (*Signature, error)
}
-// A AlgorithmSigner is a Signer that also supports specifying a specific
-// algorithm to use for signing.
+// An AlgorithmSigner is a Signer that also supports specifying an algorithm to
+// use for signing.
+//
+// An AlgorithmSigner can't advertise the algorithms it supports, so it should
+// be prepared to be invoked with every algorithm supported by the public key
+// format.
type AlgorithmSigner interface {
Signer
- // SignWithAlgorithm is like Signer.Sign, but allows specification of a
- // non-default signing algorithm. See the SigAlgo* constants in this
- // package for signature algorithms supported by this package. Callers may
- // pass an empty string for the algorithm in which case the AlgorithmSigner
- // will use its default algorithm.
+ // SignWithAlgorithm is like Signer.Sign, but allows specifying a desired
+ // signing algorithm. Callers may pass an empty string for the algorithm in
+ // which case the AlgorithmSigner will use a default algorithm. This default
+ // doesn't currently control any behavior in this package.
SignWithAlgorithm(rand io.Reader, data []byte, algorithm string) (*Signature, error)
}
@@ -381,17 +397,11 @@ func (r *rsaPublicKey) Marshal() []byte {
}
func (r *rsaPublicKey) Verify(data []byte, sig *Signature) error {
- var hash crypto.Hash
- switch sig.Format {
- case SigAlgoRSA:
- hash = crypto.SHA1
- case SigAlgoRSASHA2256:
- hash = crypto.SHA256
- case SigAlgoRSASHA2512:
- hash = crypto.SHA512
- default:
+ supportedAlgos := algorithmsForKeyFormat(r.Type())
+ if !contains(supportedAlgos, sig.Format) {
return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, r.Type())
}
+ hash := hashFuncs[sig.Format]
h := hash.New()
h.Write(data)
digest := h.Sum(nil)
@@ -466,7 +476,7 @@ func (k *dsaPublicKey) Verify(data []byte, sig *Signature) error {
if sig.Format != k.Type() {
return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, k.Type())
}
- h := crypto.SHA1.New()
+ h := hashFuncs[sig.Format].New()
h.Write(data)
digest := h.Sum(nil)
@@ -499,7 +509,7 @@ func (k *dsaPrivateKey) PublicKey() PublicKey {
}
func (k *dsaPrivateKey) Sign(rand io.Reader, data []byte) (*Signature, error) {
- return k.SignWithAlgorithm(rand, data, "")
+ return k.SignWithAlgorithm(rand, data, k.PublicKey().Type())
}
func (k *dsaPrivateKey) SignWithAlgorithm(rand io.Reader, data []byte, algorithm string) (*Signature, error) {
@@ -507,7 +517,7 @@ func (k *dsaPrivateKey) SignWithAlgorithm(rand io.Reader, data []byte, algorithm
return nil, fmt.Errorf("ssh: unsupported signature algorithm %s", algorithm)
}
- h := crypto.SHA1.New()
+ h := hashFuncs[k.PublicKey().Type()].New()
h.Write(data)
digest := h.Sum(nil)
r, s, err := dsa.Sign(rand, k.PrivateKey, digest)
@@ -603,19 +613,6 @@ func supportedEllipticCurve(curve elliptic.Curve) bool {
return curve == elliptic.P256() || curve == elliptic.P384() || curve == elliptic.P521()
}
-// ecHash returns the hash to match the given elliptic curve, see RFC
-// 5656, section 6.2.1
-func ecHash(curve elliptic.Curve) crypto.Hash {
- bitSize := curve.Params().BitSize
- switch {
- case bitSize <= 256:
- return crypto.SHA256
- case bitSize <= 384:
- return crypto.SHA384
- }
- return crypto.SHA512
-}
-
// parseECDSA parses an ECDSA key according to RFC 5656, section 3.1.
func parseECDSA(in []byte) (out PublicKey, rest []byte, err error) {
var w struct {
@@ -671,7 +668,7 @@ func (k *ecdsaPublicKey) Verify(data []byte, sig *Signature) error {
return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, k.Type())
}
- h := ecHash(k.Curve).New()
+ h := hashFuncs[sig.Format].New()
h.Write(data)
digest := h.Sum(nil)
@@ -775,7 +772,7 @@ func (k *skECDSAPublicKey) Verify(data []byte, sig *Signature) error {
return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, k.Type())
}
- h := ecHash(k.Curve).New()
+ h := hashFuncs[sig.Format].New()
h.Write([]byte(k.application))
appDigest := h.Sum(nil)
@@ -874,7 +871,7 @@ func (k *skEd25519PublicKey) Verify(data []byte, sig *Signature) error {
return fmt.Errorf("invalid size %d for Ed25519 public key", l)
}
- h := sha256.New()
+ h := hashFuncs[sig.Format].New()
h.Write([]byte(k.application))
appDigest := h.Sum(nil)
@@ -939,15 +936,6 @@ func newDSAPrivateKey(key *dsa.PrivateKey) (Signer, error) {
return &dsaPrivateKey{key}, nil
}
-type rsaSigner struct {
- AlgorithmSigner
- defaultAlgorithm string
-}
-
-func (s *rsaSigner) Sign(rand io.Reader, data []byte) (*Signature, error) {
- return s.AlgorithmSigner.SignWithAlgorithm(rand, data, s.defaultAlgorithm)
-}
-
type wrappedSigner struct {
signer crypto.Signer
pubKey PublicKey
@@ -970,44 +958,20 @@ func (s *wrappedSigner) PublicKey() PublicKey {
}
func (s *wrappedSigner) Sign(rand io.Reader, data []byte) (*Signature, error) {
- return s.SignWithAlgorithm(rand, data, "")
+ return s.SignWithAlgorithm(rand, data, s.pubKey.Type())
}
func (s *wrappedSigner) SignWithAlgorithm(rand io.Reader, data []byte, algorithm string) (*Signature, error) {
- var hashFunc crypto.Hash
-
- if _, ok := s.pubKey.(*rsaPublicKey); ok {
- // RSA keys support a few hash functions determined by the requested signature algorithm
- switch algorithm {
- case "", SigAlgoRSA:
- algorithm = SigAlgoRSA
- hashFunc = crypto.SHA1
- case SigAlgoRSASHA2256:
- hashFunc = crypto.SHA256
- case SigAlgoRSASHA2512:
- hashFunc = crypto.SHA512
- default:
- return nil, fmt.Errorf("ssh: unsupported signature algorithm %s", algorithm)
- }
- } else {
- // The only supported algorithm for all other key types is the same as the type of the key
- if algorithm == "" {
- algorithm = s.pubKey.Type()
- } else if algorithm != s.pubKey.Type() {
- return nil, fmt.Errorf("ssh: unsupported signature algorithm %s", algorithm)
- }
+ if algorithm == "" {
+ algorithm = s.pubKey.Type()
+ }
- switch key := s.pubKey.(type) {
- case *dsaPublicKey:
- hashFunc = crypto.SHA1
- case *ecdsaPublicKey:
- hashFunc = ecHash(key.Curve)
- case ed25519PublicKey:
- default:
- return nil, fmt.Errorf("ssh: unsupported key type %T", key)
- }
+ supportedAlgos := algorithmsForKeyFormat(s.pubKey.Type())
+ if !contains(supportedAlgos, algorithm) {
+ return nil, fmt.Errorf("ssh: unsupported signature algorithm %q for key format %q", algorithm, s.pubKey.Type())
}
+ hashFunc := hashFuncs[algorithm]
var digest []byte
if hashFunc != 0 {
h := hashFunc.New()
diff --git a/vendor/golang.org/x/crypto/ssh/messages.go b/vendor/golang.org/x/crypto/ssh/messages.go
index ac41a416..19bc67c4 100644
--- a/vendor/golang.org/x/crypto/ssh/messages.go
+++ b/vendor/golang.org/x/crypto/ssh/messages.go
@@ -141,6 +141,14 @@ type serviceAcceptMsg struct {
Service string `sshtype:"6"`
}
+// See RFC 8308, section 2.3
+const msgExtInfo = 7
+
+type extInfoMsg struct {
+ NumExtensions uint32 `sshtype:"7"`
+ Payload []byte `ssh:"rest"`
+}
+
// See RFC 4252, section 5.
const msgUserAuthRequest = 50
@@ -180,11 +188,11 @@ const msgUserAuthInfoRequest = 60
const msgUserAuthInfoResponse = 61
type userAuthInfoRequestMsg struct {
- User string `sshtype:"60"`
- Instruction string
- DeprecatedLanguage string
- NumPrompts uint32
- Prompts []byte `ssh:"rest"`
+ Name string `sshtype:"60"`
+ Instruction string
+ Language string
+ NumPrompts uint32
+ Prompts []byte `ssh:"rest"`
}
// See RFC 4254, section 5.1.
@@ -782,6 +790,8 @@ func decode(packet []byte) (interface{}, error) {
msg = new(serviceRequestMsg)
case msgServiceAccept:
msg = new(serviceAcceptMsg)
+ case msgExtInfo:
+ msg = new(extInfoMsg)
case msgKexInit:
msg = new(kexInitMsg)
case msgKexDHInit:
@@ -843,6 +853,7 @@ var packetTypeNames = map[byte]string{
msgDisconnect: "disconnectMsg",
msgServiceRequest: "serviceRequestMsg",
msgServiceAccept: "serviceAcceptMsg",
+ msgExtInfo: "extInfoMsg",
msgKexInit: "kexInitMsg",
msgKexDHInit: "kexDHInitMsg",
msgKexDHReply: "kexDHReplyMsg",
diff --git a/vendor/golang.org/x/crypto/ssh/server.go b/vendor/golang.org/x/crypto/ssh/server.go
index bf5364c3..70045bdf 100644
--- a/vendor/golang.org/x/crypto/ssh/server.go
+++ b/vendor/golang.org/x/crypto/ssh/server.go
@@ -120,7 +120,7 @@ type ServerConfig struct {
}
// AddHostKey adds a private key as a host key. If an existing host
-// key exists with the same algorithm, it is overwritten. Each server
+// key exists with the same public key format, it is replaced. Each server
// config must have at least one host key.
func (s *ServerConfig) AddHostKey(key Signer) {
for i, k := range s.hostKeys {
@@ -212,9 +212,10 @@ func NewServerConn(c net.Conn, config *ServerConfig) (*ServerConn, <-chan NewCha
}
// signAndMarshal signs the data with the appropriate algorithm,
-// and serializes the result in SSH wire format.
-func signAndMarshal(k Signer, rand io.Reader, data []byte) ([]byte, error) {
- sig, err := k.Sign(rand, data)
+// and serializes the result in SSH wire format. algo is the negotiate
+// algorithm and may be a certificate type.
+func signAndMarshal(k AlgorithmSigner, rand io.Reader, data []byte, algo string) ([]byte, error) {
+ sig, err := k.SignWithAlgorithm(rand, data, underlyingAlgo(algo))
if err != nil {
return nil, err
}
@@ -284,7 +285,7 @@ func (s *connection) serverHandshake(config *ServerConfig) (*Permissions, error)
func isAcceptableAlgo(algo string) bool {
switch algo {
- case SigAlgoRSA, SigAlgoRSASHA2256, SigAlgoRSASHA2512, KeyAlgoDSA, KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521, KeyAlgoSKECDSA256, KeyAlgoED25519, KeyAlgoSKED25519,
+ case KeyAlgoRSA, KeyAlgoRSASHA256, KeyAlgoRSASHA512, KeyAlgoDSA, KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521, KeyAlgoSKECDSA256, KeyAlgoED25519, KeyAlgoSKED25519,
CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01, CertAlgoSKECDSA256v01, CertAlgoED25519v01, CertAlgoSKED25519v01:
return true
}
@@ -553,6 +554,7 @@ userAuthLoop:
if !ok || len(payload) > 0 {
return nil, parseError(msgUserAuthRequest)
}
+
// Ensure the public key algo and signature algo
// are supported. Compare the private key
// algorithm name that corresponds to algo with
@@ -562,7 +564,12 @@ userAuthLoop:
authErr = fmt.Errorf("ssh: algorithm %q not accepted", sig.Format)
break
}
- signedData := buildDataSignedForAuth(sessionID, userAuthReq, algoBytes, pubKeyData)
+ if underlyingAlgo(algo) != sig.Format {
+ authErr = fmt.Errorf("ssh: signature %q not compatible with selected algorithm %q", sig.Format, algo)
+ break
+ }
+
+ signedData := buildDataSignedForAuth(sessionID, userAuthReq, algo, pubKeyData)
if err := pubKey.Verify(signedData, sig); err != nil {
return nil, err
@@ -694,7 +701,7 @@ type sshClientKeyboardInteractive struct {
*connection
}
-func (c *sshClientKeyboardInteractive) Challenge(user, instruction string, questions []string, echos []bool) (answers []string, err error) {
+func (c *sshClientKeyboardInteractive) Challenge(name, instruction string, questions []string, echos []bool) (answers []string, err error) {
if len(questions) != len(echos) {
return nil, errors.New("ssh: echos and questions must have equal length")
}
@@ -706,6 +713,7 @@ func (c *sshClientKeyboardInteractive) Challenge(user, instruction string, quest
}
if err := c.transport.writePacket(Marshal(&userAuthInfoRequestMsg{
+ Name: name,
Instruction: instruction,
NumPrompts: uint32(len(questions)),
Prompts: prompts,
diff --git a/vendor/golang.org/x/crypto/ssh/session.go b/vendor/golang.org/x/crypto/ssh/session.go
index d3321f6b..eca31a22 100644
--- a/vendor/golang.org/x/crypto/ssh/session.go
+++ b/vendor/golang.org/x/crypto/ssh/session.go
@@ -85,6 +85,7 @@ const (
IXANY = 39
IXOFF = 40
IMAXBEL = 41
+ IUTF8 = 42 // RFC 8160
ISIG = 50
ICANON = 51
XCASE = 52
diff --git a/vendor/golang.org/x/crypto/ssh/transport.go b/vendor/golang.org/x/crypto/ssh/transport.go
index 49ddc2e7..acf5a21b 100644
--- a/vendor/golang.org/x/crypto/ssh/transport.go
+++ b/vendor/golang.org/x/crypto/ssh/transport.go
@@ -238,15 +238,19 @@ var (
// (to setup server->client keys) or clientKeys (for client->server keys).
func newPacketCipher(d direction, algs directionAlgorithms, kex *kexResult) (packetCipher, error) {
cipherMode := cipherModes[algs.Cipher]
- macMode := macModes[algs.MAC]
iv := make([]byte, cipherMode.ivSize)
key := make([]byte, cipherMode.keySize)
- macKey := make([]byte, macMode.keySize)
generateKeyMaterial(iv, d.ivTag, kex)
generateKeyMaterial(key, d.keyTag, kex)
- generateKeyMaterial(macKey, d.macKeyTag, kex)
+
+ var macKey []byte
+ if !aeadCiphers[algs.Cipher] {
+ macMode := macModes[algs.MAC]
+ macKey = make([]byte, macMode.keySize)
+ generateKeyMaterial(macKey, d.macKeyTag, kex)
+ }
return cipherModes[algs.Cipher].create(key, iv, macKey, algs)
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 10:41:41 +0000