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Merge pull request #17354 from hashicorp/jbardin/known_hosts 

Verify host keys in ssh connections
This commit is contained in:
James Bardin 2018-02-15 18:33:41 -05:00 committed by GitHub
parent 162389b82b 194a4e88e2
commit e41b29d096
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
19 changed files with 2040 additions and 161 deletions
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8
communicator/ssh/communicator.go
View File

@ -125,11 +125,13 @@ func (c *Communicator) Connect(o terraform.UIOutput) (err error) {
" User: %s\n"+ " User: %s\n"+
" Password: %t\n"+ " Password: %t\n"+
" Private key: %t\n"+ " Private key: %t\n"+
" SSH Agent: %t", " SSH Agent: %t\n"+
" Checking Host Key: %t",
c.connInfo.Host, c.connInfo.User, c.connInfo.Host, c.connInfo.User,
c.connInfo.Password != "", c.connInfo.Password != "",
c.connInfo.PrivateKey != "", c.connInfo.PrivateKey != "",
c.connInfo.Agent, c.connInfo.Agent,
c.connInfo.HostKey != "",
)) ))
if c.connInfo.BastionHost != "" { if c.connInfo.BastionHost != "" {
@ -139,11 +141,13 @@ func (c *Communicator) Connect(o terraform.UIOutput) (err error) {
" User: %s\n"+ " User: %s\n"+
" Password: %t\n"+ " Password: %t\n"+
" Private key: %t\n"+ " Private key: %t\n"+
" SSH Agent: %t", " SSH Agent: %t\n"+
" Checking Host Key: %t",
c.connInfo.BastionHost, c.connInfo.BastionUser, c.connInfo.BastionHost, c.connInfo.BastionUser,
c.connInfo.BastionPassword != "", c.connInfo.BastionPassword != "",
c.connInfo.BastionPrivateKey != "", c.connInfo.BastionPrivateKey != "",
c.connInfo.Agent, c.connInfo.Agent,
c.connInfo.BastionHostKey != "",
)) ))
} }
} }

167
communicator/ssh/communicator_test.go
View File

@ -5,6 +5,7 @@ package ssh
import ( import (
"bufio" "bufio"
"bytes" "bytes"
"encoding/base64"
"fmt" "fmt"
"io" "io"
"io/ioutil" "io/ioutil"
@ -13,6 +14,7 @@ import (
"os" "os"
"path/filepath" "path/filepath"
"regexp" "regexp"
"strconv"
"strings" "strings"
"testing" "testing"
@ -50,21 +52,26 @@ gqnBycHj6AhEycjda75cs+0zybZvN4x65KZHOGW/O/7OAWEcZP5TPb3zf9ned3Hl
NsZoFj52ponUM6+99A2CmezFCN16c4mbA//luWF+k3VVqR6BpkrhKw== NsZoFj52ponUM6+99A2CmezFCN16c4mbA//luWF+k3VVqR6BpkrhKw==
-----END RSA PRIVATE KEY-----` -----END RSA PRIVATE KEY-----`
var serverConfig = &ssh.ServerConfig{ // this cert was signed by the key from testCAPublicKey
const testServerHostCert = `ssh-rsa-cert-v01@openssh.com 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`
const testCAPublicKey = `ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCrozyZIhdEvalCn+eSzHH94cO9ykiywA13ntWI7mJcHBwYTeCYWG8E9zGXyp2iDOjCGudM0Tdt8o0OofKChk9Z/qiUN0G8y1kmaXBlBM3qA5R9NPpvMYMNkYLfX6ivtZCnqrsbzaoqN2Oc/7H2StHzJWh/XCGu9otQZA6vdv1oSmAsZOjw/xIGaGQqDUaLq21J280PP1qSbdJHf76iSHE+TWe3YpqV946JWM5tCh0DykZ10VznvxYpUjzhr07IN3tVKxOXbPnnU7lX6IaLIWgfzLqwSyheeux05c3JLF9iF4sFu8ou4hwQz1iuUTU1jxgwZP0w/bkXgFFs0949lW81`
func newMockLineServer(t *testing.T, signer ssh.Signer) string {
serverConfig := &ssh.ServerConfig{
PasswordCallback: acceptUserPass("user", "pass"), PasswordCallback: acceptUserPass("user", "pass"),
PublicKeyCallback: acceptPublicKey(testClientPublicKey), PublicKeyCallback: acceptPublicKey(testClientPublicKey),
} }
func init() { var err error
// Parse and set the private key of the server, required to accept connections if signer == nil {
signer, err := ssh.ParsePrivateKey([]byte(testServerPrivateKey)) signer, err = ssh.ParsePrivateKey([]byte(testServerPrivateKey))
if err != nil { if err != nil {
panic("unable to parse private key: " + err.Error()) t.Fatalf("unable to parse private key: %s", err)
}
} }
serverConfig.AddHostKey(signer) serverConfig.AddHostKey(signer)
}
func newMockLineServer(t *testing.T) string {
l, err := net.Listen("tcp", "127.0.0.1:0") l, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil { if err != nil {
t.Fatalf("Unable to listen for connection: %s", err) t.Fatalf("Unable to listen for connection: %s", err)
@ -111,7 +118,7 @@ func newMockLineServer(t *testing.T) string {
} }
func TestNew_Invalid(t *testing.T) { func TestNew_Invalid(t *testing.T) {
address := newMockLineServer(t) address := newMockLineServer(t, nil)
parts := strings.Split(address, ":") parts := strings.Split(address, ":")
r := &terraform.InstanceState{ r := &terraform.InstanceState{
@ -139,7 +146,7 @@ func TestNew_Invalid(t *testing.T) {
} }
func TestStart(t *testing.T) { func TestStart(t *testing.T) {
address := newMockLineServer(t) address := newMockLineServer(t, nil)
parts := strings.Split(address, ":") parts := strings.Split(address, ":")
r := &terraform.InstanceState{ r := &terraform.InstanceState{
@ -171,6 +178,148 @@ func TestStart(t *testing.T) {
} }
} }
func TestHostKey(t *testing.T) {
// get the server's public key
signer, err := ssh.ParsePrivateKey([]byte(testServerPrivateKey))
if err != nil {
panic("unable to parse private key: " + err.Error())
}
pubKey := fmt.Sprintf("ssh-rsa %s", base64.StdEncoding.EncodeToString(signer.PublicKey().Marshal()))
address := newMockLineServer(t, nil)
host, p, _ := net.SplitHostPort(address)
port, _ := strconv.Atoi(p)
connInfo := &connectionInfo{
User: "user",
Password: "pass",
Host: host,
HostKey: pubKey,
Port: port,
Timeout: "30s",
}
cfg, err := prepareSSHConfig(connInfo)
if err != nil {
t.Fatal(err)
}
c := &Communicator{
connInfo: connInfo,
config: cfg,
}
var cmd remote.Cmd
stdout := new(bytes.Buffer)
cmd.Command = "echo foo"
cmd.Stdout = stdout
if err := c.Start(&cmd); err != nil {
t.Fatal(err)
}
if err := c.Disconnect(); err != nil {
t.Fatal(err)
}
// now check with the wrong HostKey
address = newMockLineServer(t, nil)
_, p, _ = net.SplitHostPort(address)
port, _ = strconv.Atoi(p)
connInfo.HostKey = testClientPublicKey
connInfo.Port = port
cfg, err = prepareSSHConfig(connInfo)
if err != nil {
t.Fatal(err)
}
c = &Communicator{
connInfo: connInfo,
config: cfg,
}
err = c.Start(&cmd)
if err == nil || !strings.Contains(err.Error(), "mismatch") {
t.Fatalf("expected host key mismatch, got error:%v", err)
}
}
func TestHostCert(t *testing.T) {
pk, _, _, _, err := ssh.ParseAuthorizedKey([]byte(testServerHostCert))
if err != nil {
t.Fatal(err)
}
signer, err := ssh.ParsePrivateKey([]byte(testServerPrivateKey))
if err != nil {
t.Fatal(err)
}
signer, err = ssh.NewCertSigner(pk.(*ssh.Certificate), signer)
if err != nil {
t.Fatal(err)
}
address := newMockLineServer(t, signer)
host, p, _ := net.SplitHostPort(address)
port, _ := strconv.Atoi(p)
connInfo := &connectionInfo{
User: "user",
Password: "pass",
Host: host,
HostKey: testCAPublicKey,
Port: port,
Timeout: "30s",
}
cfg, err := prepareSSHConfig(connInfo)
if err != nil {
t.Fatal(err)
}
c := &Communicator{
connInfo: connInfo,
config: cfg,
}
var cmd remote.Cmd
stdout := new(bytes.Buffer)
cmd.Command = "echo foo"
cmd.Stdout = stdout
if err := c.Start(&cmd); err != nil {
t.Fatal(err)
}
if err := c.Disconnect(); err != nil {
t.Fatal(err)
}
// now check with the wrong HostKey
address = newMockLineServer(t, signer)
_, p, _ = net.SplitHostPort(address)
port, _ = strconv.Atoi(p)
connInfo.HostKey = testClientPublicKey
connInfo.Port = port
cfg, err = prepareSSHConfig(connInfo)
if err != nil {
t.Fatal(err)
}
c = &Communicator{
connInfo: connInfo,
config: cfg,
}
err = c.Start(&cmd)
if err == nil || !strings.Contains(err.Error(), "authorities") {
t.Fatalf("expected host key mismatch, got error:%v", err)
}
}
func TestAccUploadFile(t *testing.T) { func TestAccUploadFile(t *testing.T) {
// use the local ssh server and scp binary to check uploads // use the local ssh server and scp binary to check uploads
if ok := os.Getenv("SSH_UPLOAD_TEST"); ok == "" { if ok := os.Getenv("SSH_UPLOAD_TEST"); ok == "" {

51
communicator/ssh/provisioner.go
View File

@ -18,6 +18,7 @@ import (
"github.com/xanzy/ssh-agent" "github.com/xanzy/ssh-agent"
"golang.org/x/crypto/ssh" "golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/agent" "golang.org/x/crypto/ssh/agent"
"golang.org/x/crypto/ssh/knownhosts"
) )
const ( const (
@ -43,6 +44,7 @@ type connectionInfo struct {
Password string Password string
PrivateKey string `mapstructure:"private_key"` PrivateKey string `mapstructure:"private_key"`
Host string Host string
HostKey string `mapstructure:"host_key"`
Port int Port int
Agent bool Agent bool
Timeout string Timeout string
@ -53,6 +55,7 @@ type connectionInfo struct {
BastionPassword string `mapstructure:"bastion_password"` BastionPassword string `mapstructure:"bastion_password"`
BastionPrivateKey string `mapstructure:"bastion_private_key"` BastionPrivateKey string `mapstructure:"bastion_private_key"`
BastionHost string `mapstructure:"bastion_host"` BastionHost string `mapstructure:"bastion_host"`
BastionHostKey string `mapstructure:"bastion_host_key"`
BastionPort int `mapstructure:"bastion_port"` BastionPort int `mapstructure:"bastion_port"`
AgentIdentity string `mapstructure:"agent_identity"` AgentIdentity string `mapstructure:"agent_identity"`
@ -144,34 +147,38 @@ func prepareSSHConfig(connInfo *connectionInfo) (*sshConfig, error) {
return nil, err return nil, err
} }
host := fmt.Sprintf("%s:%d", connInfo.Host, connInfo.Port)
sshConf, err := buildSSHClientConfig(sshClientConfigOpts{ sshConf, err := buildSSHClientConfig(sshClientConfigOpts{
user: connInfo.User, user: connInfo.User,
host: host,
privateKey: connInfo.PrivateKey, privateKey: connInfo.PrivateKey,
password: connInfo.Password, password: connInfo.Password,
hostKey: connInfo.HostKey,
sshAgent: sshAgent, sshAgent: sshAgent,
}) })
if err != nil { if err != nil {
return nil, err return nil, err
} }
connectFunc := ConnectFunc("tcp", host)
var bastionConf *ssh.ClientConfig var bastionConf *ssh.ClientConfig
if connInfo.BastionHost != "" { if connInfo.BastionHost != "" {
bastionHost := fmt.Sprintf("%s:%d", connInfo.BastionHost, connInfo.BastionPort)
bastionConf, err = buildSSHClientConfig(sshClientConfigOpts{ bastionConf, err = buildSSHClientConfig(sshClientConfigOpts{
user: connInfo.BastionUser, user: connInfo.BastionUser,
host: bastionHost,
privateKey: connInfo.BastionPrivateKey, privateKey: connInfo.BastionPrivateKey,
password: connInfo.BastionPassword, password: connInfo.BastionPassword,
hostKey: connInfo.HostKey,
sshAgent: sshAgent, sshAgent: sshAgent,
}) })
if err != nil { if err != nil {
return nil, err return nil, err
} }
}
host := fmt.Sprintf("%s:%d", connInfo.Host, connInfo.Port)
connectFunc := ConnectFunc("tcp", host)
if bastionConf != nil {
bastionHost := fmt.Sprintf("%s:%d", connInfo.BastionHost, connInfo.BastionPort)
connectFunc = BastionConnectFunc("tcp", bastionHost, bastionConf, "tcp", host) connectFunc = BastionConnectFunc("tcp", bastionHost, bastionConf, "tcp", host)
} }
@ -188,11 +195,41 @@ type sshClientConfigOpts struct {
password string password string
sshAgent *sshAgent sshAgent *sshAgent
user string user string
host string
hostKey string
} }
func buildSSHClientConfig(opts sshClientConfigOpts) (*ssh.ClientConfig, error) { func buildSSHClientConfig(opts sshClientConfigOpts) (*ssh.ClientConfig, error) {
hkCallback := ssh.InsecureIgnoreHostKey()
if opts.hostKey != "" {
// The knownhosts package only takes paths to files, but terraform
// generally wants to handle config data in-memory. Rather than making
// the known_hosts file an exception, write out the data to a temporary
// file to create the HostKeyCallback.
tf, err := ioutil.TempFile("", "tf-known_hosts")
if err != nil {
return nil, fmt.Errorf("failed to create temp known_hosts file: %s", err)
}
defer tf.Close()
defer os.RemoveAll(tf.Name())
// we mark this as a CA as well, but the host key fallback will still
// use it as a direct match if the remote host doesn't return a
// certificate.
if _, err := tf.WriteString(fmt.Sprintf("@cert-authority %s %s\n", opts.host, opts.hostKey)); err != nil {
return nil, fmt.Errorf("failed to write temp known_hosts file: %s", err)
}
tf.Sync()
hkCallback, err = knownhosts.New(tf.Name())
if err != nil {
return nil, err
}
}
conf := &ssh.ClientConfig{ conf := &ssh.ClientConfig{
HostKeyCallback: ssh.InsecureIgnoreHostKey(), HostKeyCallback: hkCallback,
User: opts.user, User: opts.user,
} }

2
terraform/eval_validate.go
View File

@ -144,8 +144,10 @@ func (n *EvalValidateProvisioner) validateConnConfig(connConfig *ResourceConfig)
// For type=ssh only (enforced in ssh communicator) // For type=ssh only (enforced in ssh communicator)
PrivateKey interface{} `mapstructure:"private_key"` PrivateKey interface{} `mapstructure:"private_key"`
HostKey interface{} `mapstructure:"host_key"`
Agent interface{} `mapstructure:"agent"` Agent interface{} `mapstructure:"agent"`
BastionHost interface{} `mapstructure:"bastion_host"` BastionHost interface{} `mapstructure:"bastion_host"`
BastionHostKey interface{} `mapstructure:"bastion_host_key"`
BastionPort interface{} `mapstructure:"bastion_port"` BastionPort interface{} `mapstructure:"bastion_port"`
BastionUser interface{} `mapstructure:"bastion_user"` BastionUser interface{} `mapstructure:"bastion_user"`
BastionPassword interface{} `mapstructure:"bastion_password"` BastionPassword interface{} `mapstructure:"bastion_password"`

198
vendor/golang.org/x/crypto/internal/chacha20/chacha_generic.go generated vendored Normal file
View File

@ -0,0 +1,198 @@
// Copyright 2016 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 ChaCha20 implements the core ChaCha20 function as specified in https://tools.ietf.org/html/rfc7539#section-2.3.
package chacha20
import "encoding/binary"
const rounds = 20
// core applies the ChaCha20 core function to 16-byte input in, 32-byte key k,
// and 16-byte constant c, and puts the result into 64-byte array out.
func core(out *[64]byte, in *[16]byte, k *[32]byte) {
j0 := uint32(0x61707865)
j1 := uint32(0x3320646e)
j2 := uint32(0x79622d32)
j3 := uint32(0x6b206574)
j4 := binary.LittleEndian.Uint32(k[0:4])
j5 := binary.LittleEndian.Uint32(k[4:8])
j6 := binary.LittleEndian.Uint32(k[8:12])
j7 := binary.LittleEndian.Uint32(k[12:16])
j8 := binary.LittleEndian.Uint32(k[16:20])
j9 := binary.LittleEndian.Uint32(k[20:24])
j10 := binary.LittleEndian.Uint32(k[24:28])
j11 := binary.LittleEndian.Uint32(k[28:32])
j12 := binary.LittleEndian.Uint32(in[0:4])
j13 := binary.LittleEndian.Uint32(in[4:8])
j14 := binary.LittleEndian.Uint32(in[8:12])
j15 := binary.LittleEndian.Uint32(in[12:16])
x0, x1, x2, x3, x4, x5, x6, x7 := j0, j1, j2, j3, j4, j5, j6, j7
x8, x9, x10, x11, x12, x13, x14, x15 := j8, j9, j10, j11, j12, j13, j14, j15
for i := 0; i < rounds; i += 2 {
x0 += x4
x12 ^= x0
x12 = (x12 << 16) | (x12 >> (16))
x8 += x12
x4 ^= x8
x4 = (x4 << 12) | (x4 >> (20))
x0 += x4
x12 ^= x0
x12 = (x12 << 8) | (x12 >> (24))
x8 += x12
x4 ^= x8
x4 = (x4 << 7) | (x4 >> (25))
x1 += x5
x13 ^= x1
x13 = (x13 << 16) | (x13 >> 16)
x9 += x13
x5 ^= x9
x5 = (x5 << 12) | (x5 >> 20)
x1 += x5
x13 ^= x1
x13 = (x13 << 8) | (x13 >> 24)
x9 += x13
x5 ^= x9
x5 = (x5 << 7) | (x5 >> 25)
x2 += x6
x14 ^= x2
x14 = (x14 << 16) | (x14 >> 16)
x10 += x14
x6 ^= x10
x6 = (x6 << 12) | (x6 >> 20)
x2 += x6
x14 ^= x2
x14 = (x14 << 8) | (x14 >> 24)
x10 += x14
x6 ^= x10
x6 = (x6 << 7) | (x6 >> 25)
x3 += x7
x15 ^= x3
x15 = (x15 << 16) | (x15 >> 16)
x11 += x15
x7 ^= x11
x7 = (x7 << 12) | (x7 >> 20)
x3 += x7
x15 ^= x3
x15 = (x15 << 8) | (x15 >> 24)
x11 += x15
x7 ^= x11
x7 = (x7 << 7) | (x7 >> 25)
x0 += x5
x15 ^= x0
x15 = (x15 << 16) | (x15 >> 16)
x10 += x15
x5 ^= x10
x5 = (x5 << 12) | (x5 >> 20)
x0 += x5
x15 ^= x0
x15 = (x15 << 8) | (x15 >> 24)
x10 += x15
x5 ^= x10
x5 = (x5 << 7) | (x5 >> 25)
x1 += x6
x12 ^= x1
x12 = (x12 << 16) | (x12 >> 16)
x11 += x12
x6 ^= x11
x6 = (x6 << 12) | (x6 >> 20)
x1 += x6
x12 ^= x1
x12 = (x12 << 8) | (x12 >> 24)
x11 += x12
x6 ^= x11
x6 = (x6 << 7) | (x6 >> 25)
x2 += x7
x13 ^= x2
x13 = (x13 << 16) | (x13 >> 16)
x8 += x13
x7 ^= x8
x7 = (x7 << 12) | (x7 >> 20)
x2 += x7
x13 ^= x2
x13 = (x13 << 8) | (x13 >> 24)
x8 += x13
x7 ^= x8
x7 = (x7 << 7) | (x7 >> 25)
x3 += x4
x14 ^= x3
x14 = (x14 << 16) | (x14 >> 16)
x9 += x14
x4 ^= x9
x4 = (x4 << 12) | (x4 >> 20)
x3 += x4
x14 ^= x3
x14 = (x14 << 8) | (x14 >> 24)
x9 += x14
x4 ^= x9
x4 = (x4 << 7) | (x4 >> 25)
}
x0 += j0
x1 += j1
x2 += j2
x3 += j3
x4 += j4
x5 += j5
x6 += j6
x7 += j7
x8 += j8
x9 += j9
x10 += j10
x11 += j11
x12 += j12
x13 += j13
x14 += j14
x15 += j15
binary.LittleEndian.PutUint32(out[0:4], x0)
binary.LittleEndian.PutUint32(out[4:8], x1)
binary.LittleEndian.PutUint32(out[8:12], x2)
binary.LittleEndian.PutUint32(out[12:16], x3)
binary.LittleEndian.PutUint32(out[16:20], x4)
binary.LittleEndian.PutUint32(out[20:24], x5)
binary.LittleEndian.PutUint32(out[24:28], x6)
binary.LittleEndian.PutUint32(out[28:32], x7)
binary.LittleEndian.PutUint32(out[32:36], x8)
binary.LittleEndian.PutUint32(out[36:40], x9)
binary.LittleEndian.PutUint32(out[40:44], x10)
binary.LittleEndian.PutUint32(out[44:48], x11)
binary.LittleEndian.PutUint32(out[48:52], x12)
binary.LittleEndian.PutUint32(out[52:56], x13)
binary.LittleEndian.PutUint32(out[56:60], x14)
binary.LittleEndian.PutUint32(out[60:64], x15)
}
// XORKeyStream crypts bytes from in to out using the given key and counters.
// In and out must overlap entirely or not at all. Counter contains the raw
// ChaCha20 counter bytes (i.e. block counter followed by nonce).
func XORKeyStream(out, in []byte, counter *[16]byte, key *[32]byte) {
var block [64]byte
var counterCopy [16]byte
copy(counterCopy[:], counter[:])
for len(in) >= 64 {
core(&block, &counterCopy, key)
for i, x := range block {
out[i] = in[i] ^ x
}
u := uint32(1)
for i := 0; i < 4; i++ {
u += uint32(counterCopy[i])
counterCopy[i] = byte(u)
u >>= 8
}
in = in[64:]
out = out[64:]
}
if len(in) > 0 {
core(&block, &counterCopy, key)
for i, v := range in {
out[i] = v ^ block[i]
}
}
}

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// Copyright 2012 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 poly1305 implements Poly1305 one-time message authentication code as
specified in https://cr.yp.to/mac/poly1305-20050329.pdf.
Poly1305 is a fast, one-time authentication function. It is infeasible for an
attacker to generate an authenticator for a message without the key. However, a
key must only be used for a single message. Authenticating two different
messages with the same key allows an attacker to forge authenticators for other
messages with the same key.
Poly1305 was originally coupled with AES in order to make Poly1305-AES. AES was
used with a fixed key in order to generate one-time keys from an nonce.
However, in this package AES isn't used and the one-time key is specified
directly.
*/
package poly1305 // import "golang.org/x/crypto/poly1305"
import "crypto/subtle"
// TagSize is the size, in bytes, of a poly1305 authenticator.
const TagSize = 16
// Verify returns true if mac is a valid authenticator for m with the given
// key.
func Verify(mac *[16]byte, m []byte, key *[32]byte) bool {
var tmp [16]byte
Sum(&tmp, m, key)
return subtle.ConstantTimeCompare(tmp[:], mac[:]) == 1
}

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// Copyright 2012 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.
// +build amd64,!gccgo,!appengine
package poly1305
// This function is implemented in sum_amd64.s
//go:noescape
func poly1305(out *[16]byte, m *byte, mlen uint64, key *[32]byte)
// Sum generates an authenticator for m using a one-time key and puts the
// 16-byte result into out. Authenticating two different messages with the same
// key allows an attacker to forge messages at will.
func Sum(out *[16]byte, m []byte, key *[32]byte) {
var mPtr *byte
if len(m) > 0 {
mPtr = &m[0]
}
poly1305(out, mPtr, uint64(len(m)), key)
}

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// Copyright 2012 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.
// +build amd64,!gccgo,!appengine
#include "textflag.h"
#define POLY1305_ADD(msg, h0, h1, h2) \
ADDQ 0(msg), h0; \
ADCQ 8(msg), h1; \
ADCQ $1, h2; \
LEAQ 16(msg), msg
#define POLY1305_MUL(h0, h1, h2, r0, r1, t0, t1, t2, t3) \
MOVQ r0, AX; \
MULQ h0; \
MOVQ AX, t0; \
MOVQ DX, t1; \
MOVQ r0, AX; \
MULQ h1; \
ADDQ AX, t1; \
ADCQ $0, DX; \
MOVQ r0, t2; \
IMULQ h2, t2; \
ADDQ DX, t2; \
\
MOVQ r1, AX; \
MULQ h0; \
ADDQ AX, t1; \
ADCQ $0, DX; \
MOVQ DX, h0; \
MOVQ r1, t3; \
IMULQ h2, t3; \
MOVQ r1, AX; \
MULQ h1; \
ADDQ AX, t2; \
ADCQ DX, t3; \
ADDQ h0, t2; \
ADCQ $0, t3; \
\
MOVQ t0, h0; \
MOVQ t1, h1; \
MOVQ t2, h2; \
ANDQ $3, h2; \
MOVQ t2, t0; \
ANDQ $0xFFFFFFFFFFFFFFFC, t0; \
ADDQ t0, h0; \
ADCQ t3, h1; \
ADCQ $0, h2; \
SHRQ $2, t3, t2; \
SHRQ $2, t3; \
ADDQ t2, h0; \
ADCQ t3, h1; \
ADCQ $0, h2
DATA ·poly1305Mask<>+0x00(SB)/8, $0x0FFFFFFC0FFFFFFF
DATA ·poly1305Mask<>+0x08(SB)/8, $0x0FFFFFFC0FFFFFFC
GLOBL ·poly1305Mask<>(SB), RODATA, $16
// func poly1305(out *[16]byte, m *byte, mlen uint64, key *[32]key)
TEXT ·poly1305(SB), $0-32
MOVQ out+0(FP), DI
MOVQ m+8(FP), SI
MOVQ mlen+16(FP), R15
MOVQ key+24(FP), AX
MOVQ 0(AX), R11
MOVQ 8(AX), R12
ANDQ ·poly1305Mask<>(SB), R11 // r0
ANDQ ·poly1305Mask<>+8(SB), R12 // r1
XORQ R8, R8 // h0
XORQ R9, R9 // h1
XORQ R10, R10 // h2
CMPQ R15, $16
JB bytes_between_0_and_15
loop:
POLY1305_ADD(SI, R8, R9, R10)
multiply:
POLY1305_MUL(R8, R9, R10, R11, R12, BX, CX, R13, R14)
SUBQ $16, R15
CMPQ R15, $16
JAE loop
bytes_between_0_and_15:
TESTQ R15, R15
JZ done
MOVQ $1, BX
XORQ CX, CX
XORQ R13, R13
ADDQ R15, SI
flush_buffer:
SHLQ $8, BX, CX
SHLQ $8, BX
MOVB -1(SI), R13
XORQ R13, BX
DECQ SI
DECQ R15
JNZ flush_buffer
ADDQ BX, R8
ADCQ CX, R9
ADCQ $0, R10
MOVQ $16, R15
JMP multiply
done:
MOVQ R8, AX
MOVQ R9, BX
SUBQ $0xFFFFFFFFFFFFFFFB, AX
SBBQ $0xFFFFFFFFFFFFFFFF, BX
SBBQ $3, R10
CMOVQCS R8, AX
CMOVQCS R9, BX
MOVQ key+24(FP), R8
ADDQ 16(R8), AX
ADCQ 24(R8), BX
MOVQ AX, 0(DI)
MOVQ BX, 8(DI)
RET

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// Copyright 2015 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.
// +build arm,!gccgo,!appengine,!nacl
package poly1305
// This function is implemented in sum_arm.s
//go:noescape
func poly1305_auth_armv6(out *[16]byte, m *byte, mlen uint32, key *[32]byte)
// Sum generates an authenticator for m using a one-time key and puts the
// 16-byte result into out. Authenticating two different messages with the same
// key allows an attacker to forge messages at will.
func Sum(out *[16]byte, m []byte, key *[32]byte) {
var mPtr *byte
if len(m) > 0 {
mPtr = &m[0]
}
poly1305_auth_armv6(out, mPtr, uint32(len(m)), key)
}

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// Copyright 2015 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.
// +build arm,!gccgo,!appengine,!nacl
#include "textflag.h"
// This code was translated into a form compatible with 5a from the public
// domain source by Andrew Moon: github.com/floodyberry/poly1305-opt/blob/master/app/extensions/poly1305.
DATA ·poly1305_init_constants_armv6<>+0x00(SB)/4, $0x3ffffff
DATA ·poly1305_init_constants_armv6<>+0x04(SB)/4, $0x3ffff03
DATA ·poly1305_init_constants_armv6<>+0x08(SB)/4, $0x3ffc0ff
DATA ·poly1305_init_constants_armv6<>+0x0c(SB)/4, $0x3f03fff
DATA ·poly1305_init_constants_armv6<>+0x10(SB)/4, $0x00fffff
GLOBL ·poly1305_init_constants_armv6<>(SB), 8, $20
// Warning: the linker may use R11 to synthesize certain instructions. Please
// take care and verify that no synthetic instructions use it.
TEXT poly1305_init_ext_armv6<>(SB), NOSPLIT, $0
// Needs 16 bytes of stack and 64 bytes of space pointed to by R0. (It
// might look like it's only 60 bytes of space but the final four bytes
// will be written by another function.) We need to skip over four
// bytes of stack because that's saving the value of 'g'.
ADD $4, R13, R8
MOVM.IB [R4-R7], (R8)
MOVM.IA.W (R1), [R2-R5]
MOVW $·poly1305_init_constants_armv6<>(SB), R7
MOVW R2, R8
MOVW R2>>26, R9
MOVW R3>>20, g
MOVW R4>>14, R11
MOVW R5>>8, R12
ORR R3<<6, R9, R9
ORR R4<<12, g, g
ORR R5<<18, R11, R11
MOVM.IA (R7), [R2-R6]
AND R8, R2, R2
AND R9, R3, R3
AND g, R4, R4
AND R11, R5, R5
AND R12, R6, R6
MOVM.IA.W [R2-R6], (R0)
EOR R2, R2, R2
EOR R3, R3, R3
EOR R4, R4, R4
EOR R5, R5, R5
EOR R6, R6, R6
MOVM.IA.W [R2-R6], (R0)
MOVM.IA.W (R1), [R2-R5]
MOVM.IA [R2-R6], (R0)
ADD $20, R13, R0
MOVM.DA (R0), [R4-R7]
RET
#define MOVW_UNALIGNED(Rsrc, Rdst, Rtmp, offset) \
MOVBU (offset+0)(Rsrc), Rtmp; \
MOVBU Rtmp, (offset+0)(Rdst); \
MOVBU (offset+1)(Rsrc), Rtmp; \
MOVBU Rtmp, (offset+1)(Rdst); \
MOVBU (offset+2)(Rsrc), Rtmp; \
MOVBU Rtmp, (offset+2)(Rdst); \
MOVBU (offset+3)(Rsrc), Rtmp; \
MOVBU Rtmp, (offset+3)(Rdst)
TEXT poly1305_blocks_armv6<>(SB), NOSPLIT, $0
// Needs 24 bytes of stack for saved registers and then 88 bytes of
// scratch space after that. We assume that 24 bytes at (R13) have
// already been used: four bytes for the link register saved in the
// prelude of poly1305_auth_armv6, four bytes for saving the value of g
// in that function and 16 bytes of scratch space used around
// poly1305_finish_ext_armv6_skip1.
ADD $24, R13, R12
MOVM.IB [R4-R8, R14], (R12)
MOVW R0, 88(R13)
MOVW R1, 92(R13)
MOVW R2, 96(R13)
MOVW R1, R14
MOVW R2, R12
MOVW 56(R0), R8
WORD $0xe1180008 // TST R8, R8 not working see issue 5921
EOR R6, R6, R6
MOVW.EQ $(1<<24), R6
MOVW R6, 84(R13)
ADD $116, R13, g
MOVM.IA (R0), [R0-R9]
MOVM.IA [R0-R4], (g)
CMP $16, R12
BLO poly1305_blocks_armv6_done
poly1305_blocks_armv6_mainloop:
WORD $0xe31e0003 // TST R14, #3 not working see issue 5921
BEQ poly1305_blocks_armv6_mainloop_aligned
ADD $100, R13, g
MOVW_UNALIGNED(R14, g, R0, 0)
MOVW_UNALIGNED(R14, g, R0, 4)
MOVW_UNALIGNED(R14, g, R0, 8)
MOVW_UNALIGNED(R14, g, R0, 12)
MOVM.IA (g), [R0-R3]
ADD $16, R14
B poly1305_blocks_armv6_mainloop_loaded
poly1305_blocks_armv6_mainloop_aligned:
MOVM.IA.W (R14), [R0-R3]
poly1305_blocks_armv6_mainloop_loaded:
MOVW R0>>26, g
MOVW R1>>20, R11
MOVW R2>>14, R12
MOVW R14, 92(R13)
MOVW R3>>8, R4
ORR R1<<6, g, g
ORR R2<<12, R11, R11
ORR R3<<18, R12, R12
BIC $0xfc000000, R0, R0
BIC $0xfc000000, g, g
MOVW 84(R13), R3
BIC $0xfc000000, R11, R11
BIC $0xfc000000, R12, R12
ADD R0, R5, R5
ADD g, R6, R6
ORR R3, R4, R4
ADD R11, R7, R7
ADD $116, R13, R14
ADD R12, R8, R8
ADD R4, R9, R9
MOVM.IA (R14), [R0-R4]
MULLU R4, R5, (R11, g)
MULLU R3, R5, (R14, R12)
MULALU R3, R6, (R11, g)
MULALU R2, R6, (R14, R12)
MULALU R2, R7, (R11, g)
MULALU R1, R7, (R14, R12)
ADD R4<<2, R4, R4
ADD R3<<2, R3, R3
MULALU R1, R8, (R11, g)
MULALU R0, R8, (R14, R12)
MULALU R0, R9, (R11, g)
MULALU R4, R9, (R14, R12)
MOVW g, 76(R13)
MOVW R11, 80(R13)
MOVW R12, 68(R13)
MOVW R14, 72(R13)
MULLU R2, R5, (R11, g)
MULLU R1, R5, (R14, R12)
MULALU R1, R6, (R11, g)
MULALU R0, R6, (R14, R12)
MULALU R0, R7, (R11, g)
MULALU R4, R7, (R14, R12)
ADD R2<<2, R2, R2
ADD R1<<2, R1, R1
MULALU R4, R8, (R11, g)
MULALU R3, R8, (R14, R12)
MULALU R3, R9, (R11, g)
MULALU R2, R9, (R14, R12)
MOVW g, 60(R13)
MOVW R11, 64(R13)
MOVW R12, 52(R13)
MOVW R14, 56(R13)
MULLU R0, R5, (R11, g)
MULALU R4, R6, (R11, g)
MULALU R3, R7, (R11, g)
MULALU R2, R8, (R11, g)
MULALU R1, R9, (R11, g)
ADD $52, R13, R0
MOVM.IA (R0), [R0-R7]
MOVW g>>26, R12
MOVW R4>>26, R14
ORR R11<<6, R12, R12
ORR R5<<6, R14, R14
BIC $0xfc000000, g, g
BIC $0xfc000000, R4, R4
ADD.S R12, R0, R0
ADC $0, R1, R1
ADD.S R14, R6, R6
ADC $0, R7, R7
MOVW R0>>26, R12
MOVW R6>>26, R14
ORR R1<<6, R12, R12
ORR R7<<6, R14, R14
BIC $0xfc000000, R0, R0
BIC $0xfc000000, R6, R6
ADD R14<<2, R14, R14
ADD.S R12, R2, R2
ADC $0, R3, R3
ADD R14, g, g
MOVW R2>>26, R12
MOVW g>>26, R14
ORR R3<<6, R12, R12
BIC $0xfc000000, g, R5
BIC $0xfc000000, R2, R7
ADD R12, R4, R4
ADD R14, R0, R0
MOVW R4>>26, R12
BIC $0xfc000000, R4, R8
ADD R12, R6, R9
MOVW 96(R13), R12
MOVW 92(R13), R14
MOVW R0, R6
CMP $32, R12
SUB $16, R12, R12
MOVW R12, 96(R13)
BHS poly1305_blocks_armv6_mainloop
poly1305_blocks_armv6_done:
MOVW 88(R13), R12
MOVW R5, 20(R12)
MOVW R6, 24(R12)
MOVW R7, 28(R12)
MOVW R8, 32(R12)
MOVW R9, 36(R12)
ADD $48, R13, R0
MOVM.DA (R0), [R4-R8, R14]
RET
#define MOVHUP_UNALIGNED(Rsrc, Rdst, Rtmp) \
MOVBU.P 1(Rsrc), Rtmp; \
MOVBU.P Rtmp, 1(Rdst); \
MOVBU.P 1(Rsrc), Rtmp; \
MOVBU.P Rtmp, 1(Rdst)
#define MOVWP_UNALIGNED(Rsrc, Rdst, Rtmp) \
MOVHUP_UNALIGNED(Rsrc, Rdst, Rtmp); \
MOVHUP_UNALIGNED(Rsrc, Rdst, Rtmp)
// func poly1305_auth_armv6(out *[16]byte, m *byte, mlen uint32, key *[32]key)
TEXT ·poly1305_auth_armv6(SB), $196-16
// The value 196, just above, is the sum of 64 (the size of the context
// structure) and 132 (the amount of stack needed).
//
// At this point, the stack pointer (R13) has been moved down. It
// points to the saved link register and there's 196 bytes of free
// space above it.
//
// The stack for this function looks like:
//
// +---------------------
// |
// | 64 bytes of context structure
// |
// +---------------------
// |
// | 112 bytes for poly1305_blocks_armv6
// |
// +---------------------
// | 16 bytes of final block, constructed at
// | poly1305_finish_ext_armv6_skip8
// +---------------------
// | four bytes of saved 'g'
// +---------------------
// | lr, saved by prelude <- R13 points here
// +---------------------
MOVW g, 4(R13)
MOVW out+0(FP), R4
MOVW m+4(FP), R5
MOVW mlen+8(FP), R6
MOVW key+12(FP), R7
ADD $136, R13, R0 // 136 = 4 + 4 + 16 + 112
MOVW R7, R1
// poly1305_init_ext_armv6 will write to the stack from R13+4, but
// that's ok because none of the other values have been written yet.
BL poly1305_init_ext_armv6<>(SB)
BIC.S $15, R6, R2
BEQ poly1305_auth_armv6_noblocks
ADD $136, R13, R0
MOVW R5, R1
ADD R2, R5, R5
SUB R2, R6, R6
BL poly1305_blocks_armv6<>(SB)
poly1305_auth_armv6_noblocks:
ADD $136, R13, R0
MOVW R5, R1
MOVW R6, R2
MOVW R4, R3
MOVW R0, R5
MOVW R1, R6
MOVW R2, R7
MOVW R3, R8
AND.S R2, R2, R2
BEQ poly1305_finish_ext_armv6_noremaining
EOR R0, R0
ADD $8, R13, R9 // 8 = offset to 16 byte scratch space
MOVW R0, (R9)
MOVW R0, 4(R9)
MOVW R0, 8(R9)
MOVW R0, 12(R9)
WORD $0xe3110003 // TST R1, #3 not working see issue 5921
BEQ poly1305_finish_ext_armv6_aligned
WORD $0xe3120008 // TST R2, #8 not working see issue 5921
BEQ poly1305_finish_ext_armv6_skip8
MOVWP_UNALIGNED(R1, R9, g)
MOVWP_UNALIGNED(R1, R9, g)
poly1305_finish_ext_armv6_skip8:
WORD $0xe3120004 // TST $4, R2 not working see issue 5921
BEQ poly1305_finish_ext_armv6_skip4
MOVWP_UNALIGNED(R1, R9, g)
poly1305_finish_ext_armv6_skip4:
WORD $0xe3120002 // TST $2, R2 not working see issue 5921
BEQ poly1305_finish_ext_armv6_skip2
MOVHUP_UNALIGNED(R1, R9, g)
B poly1305_finish_ext_armv6_skip2
poly1305_finish_ext_armv6_aligned:
WORD $0xe3120008 // TST R2, #8 not working see issue 5921
BEQ poly1305_finish_ext_armv6_skip8_aligned
MOVM.IA.W (R1), [g-R11]
MOVM.IA.W [g-R11], (R9)
poly1305_finish_ext_armv6_skip8_aligned:
WORD $0xe3120004 // TST $4, R2 not working see issue 5921
BEQ poly1305_finish_ext_armv6_skip4_aligned
MOVW.P 4(R1), g
MOVW.P g, 4(R9)
poly1305_finish_ext_armv6_skip4_aligned:
WORD $0xe3120002 // TST $2, R2 not working see issue 5921
BEQ poly1305_finish_ext_armv6_skip2
MOVHU.P 2(R1), g
MOVH.P g, 2(R9)
poly1305_finish_ext_armv6_skip2:
WORD $0xe3120001 // TST $1, R2 not working see issue 5921
BEQ poly1305_finish_ext_armv6_skip1
MOVBU.P 1(R1), g
MOVBU.P g, 1(R9)
poly1305_finish_ext_armv6_skip1:
MOVW $1, R11
MOVBU R11, 0(R9)
MOVW R11, 56(R5)
MOVW R5, R0
ADD $8, R13, R1
MOVW $16, R2
BL poly1305_blocks_armv6<>(SB)
poly1305_finish_ext_armv6_noremaining:
MOVW 20(R5), R0
MOVW 24(R5), R1
MOVW 28(R5), R2
MOVW 32(R5), R3
MOVW 36(R5), R4
MOVW R4>>26, R12
BIC $0xfc000000, R4, R4
ADD R12<<2, R12, R12
ADD R12, R0, R0
MOVW R0>>26, R12
BIC $0xfc000000, R0, R0
ADD R12, R1, R1
MOVW R1>>26, R12
BIC $0xfc000000, R1, R1
ADD R12, R2, R2
MOVW R2>>26, R12
BIC $0xfc000000, R2, R2
ADD R12, R3, R3
MOVW R3>>26, R12
BIC $0xfc000000, R3, R3
ADD R12, R4, R4
ADD $5, R0, R6
MOVW R6>>26, R12
BIC $0xfc000000, R6, R6
ADD R12, R1, R7
MOVW R7>>26, R12
BIC $0xfc000000, R7, R7
ADD R12, R2, g
MOVW g>>26, R12
BIC $0xfc000000, g, g
ADD R12, R3, R11
MOVW $-(1<<26), R12
ADD R11>>26, R12, R12
BIC $0xfc000000, R11, R11
ADD R12, R4, R9
MOVW R9>>31, R12
SUB $1, R12
AND R12, R6, R6
AND R12, R7, R7
AND R12, g, g
AND R12, R11, R11
AND R12, R9, R9
MVN R12, R12
AND R12, R0, R0
AND R12, R1, R1
AND R12, R2, R2
AND R12, R3, R3
AND R12, R4, R4
ORR R6, R0, R0
ORR R7, R1, R1
ORR g, R2, R2
ORR R11, R3, R3
ORR R9, R4, R4
ORR R1<<26, R0, R0
MOVW R1>>6, R1
ORR R2<<20, R1, R1
MOVW R2>>12, R2
ORR R3<<14, R2, R2
MOVW R3>>18, R3
ORR R4<<8, R3, R3
MOVW 40(R5), R6
MOVW 44(R5), R7
MOVW 48(R5), g
MOVW 52(R5), R11
ADD.S R6, R0, R0
ADC.S R7, R1, R1
ADC.S g, R2, R2
ADC.S R11, R3, R3
MOVM.IA [R0-R3], (R8)
MOVW R5, R12
EOR R0, R0, R0
EOR R1, R1, R1
EOR R2, R2, R2
EOR R3, R3, R3
EOR R4, R4, R4
EOR R5, R5, R5
EOR R6, R6, R6
EOR R7, R7, R7
MOVM.IA.W [R0-R7], (R12)
MOVM.IA [R0-R7], (R12)
MOVW 4(R13), g
RET

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// Copyright 2012 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.
// +build !amd64,!arm gccgo appengine nacl
package poly1305
import "encoding/binary"
// Sum generates an authenticator for msg using a one-time key and puts the
// 16-byte result into out. Authenticating two different messages with the same
// key allows an attacker to forge messages at will.
func Sum(out *[TagSize]byte, msg []byte, key *[32]byte) {
var (
h0, h1, h2, h3, h4 uint32 // the hash accumulators
r0, r1, r2, r3, r4 uint64 // the r part of the key
)
r0 = uint64(binary.LittleEndian.Uint32(key[0:]) & 0x3ffffff)
r1 = uint64((binary.LittleEndian.Uint32(key[3:]) >> 2) & 0x3ffff03)
r2 = uint64((binary.LittleEndian.Uint32(key[6:]) >> 4) & 0x3ffc0ff)
r3 = uint64((binary.LittleEndian.Uint32(key[9:]) >> 6) & 0x3f03fff)
r4 = uint64((binary.LittleEndian.Uint32(key[12:]) >> 8) & 0x00fffff)
R1, R2, R3, R4 := r1*5, r2*5, r3*5, r4*5
for len(msg) >= TagSize {
// h += msg
h0 += binary.LittleEndian.Uint32(msg[0:]) & 0x3ffffff
h1 += (binary.LittleEndian.Uint32(msg[3:]) >> 2) & 0x3ffffff
h2 += (binary.LittleEndian.Uint32(msg[6:]) >> 4) & 0x3ffffff
h3 += (binary.LittleEndian.Uint32(msg[9:]) >> 6) & 0x3ffffff
h4 += (binary.LittleEndian.Uint32(msg[12:]) >> 8) | (1 << 24)
// h *= r
d0 := (uint64(h0) * r0) + (uint64(h1) * R4) + (uint64(h2) * R3) + (uint64(h3) * R2) + (uint64(h4) * R1)
d1 := (d0 >> 26) + (uint64(h0) * r1) + (uint64(h1) * r0) + (uint64(h2) * R4) + (uint64(h3) * R3) + (uint64(h4) * R2)
d2 := (d1 >> 26) + (uint64(h0) * r2) + (uint64(h1) * r1) + (uint64(h2) * r0) + (uint64(h3) * R4) + (uint64(h4) * R3)
d3 := (d2 >> 26) + (uint64(h0) * r3) + (uint64(h1) * r2) + (uint64(h2) * r1) + (uint64(h3) * r0) + (uint64(h4) * R4)
d4 := (d3 >> 26) + (uint64(h0) * r4) + (uint64(h1) * r3) + (uint64(h2) * r2) + (uint64(h3) * r1) + (uint64(h4) * r0)
// h %= p
h0 = uint32(d0) & 0x3ffffff
h1 = uint32(d1) & 0x3ffffff
h2 = uint32(d2) & 0x3ffffff
h3 = uint32(d3) & 0x3ffffff
h4 = uint32(d4) & 0x3ffffff
h0 += uint32(d4>>26) * 5
h1 += h0 >> 26
h0 = h0 & 0x3ffffff
msg = msg[TagSize:]
}
if len(msg) > 0 {
var block [TagSize]byte
off := copy(block[:], msg)
block[off] = 0x01
// h += msg
h0 += binary.LittleEndian.Uint32(block[0:]) & 0x3ffffff
h1 += (binary.LittleEndian.Uint32(block[3:]) >> 2) & 0x3ffffff
h2 += (binary.LittleEndian.Uint32(block[6:]) >> 4) & 0x3ffffff
h3 += (binary.LittleEndian.Uint32(block[9:]) >> 6) & 0x3ffffff
h4 += (binary.LittleEndian.Uint32(block[12:]) >> 8)
// h *= r
d0 := (uint64(h0) * r0) + (uint64(h1) * R4) + (uint64(h2) * R3) + (uint64(h3) * R2) + (uint64(h4) * R1)
d1 := (d0 >> 26) + (uint64(h0) * r1) + (uint64(h1) * r0) + (uint64(h2) * R4) + (uint64(h3) * R3) + (uint64(h4) * R2)
d2 := (d1 >> 26) + (uint64(h0) * r2) + (uint64(h1) * r1) + (uint64(h2) * r0) + (uint64(h3) * R4) + (uint64(h4) * R3)
d3 := (d2 >> 26) + (uint64(h0) * r3) + (uint64(h1) * r2) + (uint64(h2) * r1) + (uint64(h3) * r0) + (uint64(h4) * R4)
d4 := (d3 >> 26) + (uint64(h0) * r4) + (uint64(h1) * r3) + (uint64(h2) * r2) + (uint64(h3) * r1) + (uint64(h4) * r0)
// h %= p
h0 = uint32(d0) & 0x3ffffff
h1 = uint32(d1) & 0x3ffffff
h2 = uint32(d2) & 0x3ffffff
h3 = uint32(d3) & 0x3ffffff
h4 = uint32(d4) & 0x3ffffff
h0 += uint32(d4>>26) * 5
h1 += h0 >> 26
h0 = h0 & 0x3ffffff
}
// h %= p reduction
h2 += h1 >> 26
h1 &= 0x3ffffff
h3 += h2 >> 26
h2 &= 0x3ffffff
h4 += h3 >> 26
h3 &= 0x3ffffff
h0 += 5 * (h4 >> 26)
h4 &= 0x3ffffff
h1 += h0 >> 26
h0 &= 0x3ffffff
// h - p
t0 := h0 + 5
t1 := h1 + (t0 >> 26)
t2 := h2 + (t1 >> 26)
t3 := h3 + (t2 >> 26)
t4 := h4 + (t3 >> 26) - (1 << 26)
t0 &= 0x3ffffff
t1 &= 0x3ffffff
t2 &= 0x3ffffff
t3 &= 0x3ffffff
// select h if h < p else h - p
t_mask := (t4 >> 31) - 1
h_mask := ^t_mask
h0 = (h0 & h_mask) | (t0 & t_mask)
h1 = (h1 & h_mask) | (t1 & t_mask)
h2 = (h2 & h_mask) | (t2 & t_mask)
h3 = (h3 & h_mask) | (t3 & t_mask)
h4 = (h4 & h_mask) | (t4 & t_mask)
// h %= 2^128
h0 |= h1 << 26
h1 = ((h1 >> 6) | (h2 << 20))
h2 = ((h2 >> 12) | (h3 << 14))
h3 = ((h3 >> 18) | (h4 << 8))
// s: the s part of the key
// tag = (h + s) % (2^128)
t := uint64(h0) + uint64(binary.LittleEndian.Uint32(key[16:]))
h0 = uint32(t)
t = uint64(h1) + uint64(binary.LittleEndian.Uint32(key[20:])) + (t >> 32)
h1 = uint32(t)
t = uint64(h2) + uint64(binary.LittleEndian.Uint32(key[24:])) + (t >> 32)
h2 = uint32(t)
t = uint64(h3) + uint64(binary.LittleEndian.Uint32(key[28:])) + (t >> 32)
h3 = uint32(t)
binary.LittleEndian.PutUint32(out[0:], h0)
binary.LittleEndian.PutUint32(out[4:], h1)
binary.LittleEndian.PutUint32(out[8:], h2)
binary.LittleEndian.PutUint32(out[12:], h3)
}

6
vendor/golang.org/x/crypto/ssh/certs.go generated vendored
View File

@ -44,7 +44,9 @@ type Signature struct {
const CertTimeInfinity = 1<<64 - 1 const CertTimeInfinity = 1<<64 - 1
// An Certificate represents an OpenSSH certificate as defined in // An Certificate represents an OpenSSH certificate as defined in
// [PROTOCOL.certkeys]?rev=1.8. // [PROTOCOL.certkeys]?rev=1.8. The Certificate type implements the
// PublicKey interface, so it can be unmarshaled using
// ParsePublicKey.
type Certificate struct { type Certificate struct {
Nonce []byte Nonce []byte
Key PublicKey Key PublicKey
@ -340,7 +342,7 @@ func (c *CertChecker) Authenticate(conn ConnMetadata, pubKey PublicKey) (*Permis
// the signature of the certificate. // the signature of the certificate.
func (c *CertChecker) CheckCert(principal string, cert *Certificate) error { func (c *CertChecker) CheckCert(principal string, cert *Certificate) error {
if c.IsRevoked != nil && c.IsRevoked(cert) { if c.IsRevoked != nil && c.IsRevoked(cert) {
return fmt.Errorf("ssh: certicate serial %d revoked", cert.Serial) return fmt.Errorf("ssh: certificate serial %d revoked", cert.Serial)
} }
for opt := range cert.CriticalOptions { for opt := range cert.CriticalOptions {

212
vendor/golang.org/x/crypto/ssh/cipher.go generated vendored
View File

@ -16,6 +16,9 @@ import (
"hash" "hash"
"io" "io"
"io/ioutil" "io/ioutil"
"golang.org/x/crypto/internal/chacha20"
"golang.org/x/crypto/poly1305"
) )
const ( const (
@ -53,32 +56,25 @@ func newRC4(key, iv []byte) (cipher.Stream, error) {
return rc4.NewCipher(key) return rc4.NewCipher(key)
} }
type streamCipherMode struct { type cipherMode struct {
keySize int keySize int
ivSize int ivSize int
skip int create func(key, iv []byte, macKey []byte, algs directionAlgorithms) (packetCipher, error)
createFunc func(key, iv []byte) (cipher.Stream, error)
} }
func (c *streamCipherMode) createStream(key, iv []byte) (cipher.Stream, error) { func streamCipherMode(skip int, createFunc func(key, iv []byte) (cipher.Stream, error)) func(key, iv []byte, macKey []byte, algs directionAlgorithms) (packetCipher, error) {
if len(key) < c.keySize { return func(key, iv, macKey []byte, algs directionAlgorithms) (packetCipher, error) {
panic("ssh: key length too small for cipher") stream, err := createFunc(key, iv)
}
if len(iv) < c.ivSize {
panic("ssh: iv too small for cipher")
}
stream, err := c.createFunc(key[:c.keySize], iv[:c.ivSize])
if err != nil { if err != nil {
return nil, err return nil, err
} }
var streamDump []byte var streamDump []byte
if c.skip > 0 { if skip > 0 {
streamDump = make([]byte, 512) streamDump = make([]byte, 512)
} }
for remainingToDump := c.skip; remainingToDump > 0; { for remainingToDump := skip; remainingToDump > 0; {
dumpThisTime := remainingToDump dumpThisTime := remainingToDump
if dumpThisTime > len(streamDump) { if dumpThisTime > len(streamDump) {
dumpThisTime = len(streamDump) dumpThisTime = len(streamDump)
@ -87,44 +83,51 @@ func (c *streamCipherMode) createStream(key, iv []byte) (cipher.Stream, error) {
remainingToDump -= dumpThisTime remainingToDump -= dumpThisTime
} }
return stream, nil mac := macModes[algs.MAC].new(macKey)
return &streamPacketCipher{
mac: mac,
etm: macModes[algs.MAC].etm,
macResult: make([]byte, mac.Size()),
cipher: stream,
}, nil
}
} }
// cipherModes documents properties of supported ciphers. Ciphers not included // cipherModes documents properties of supported ciphers. Ciphers not included
// are not supported and will not be negotiated, even if explicitly requested in // are not supported and will not be negotiated, even if explicitly requested in
// ClientConfig.Crypto.Ciphers. // ClientConfig.Crypto.Ciphers.
var cipherModes = map[string]*streamCipherMode{ var cipherModes = map[string]*cipherMode{
// Ciphers from RFC4344, which introduced many CTR-based ciphers. Algorithms // Ciphers from RFC4344, which introduced many CTR-based ciphers. Algorithms
// are defined in the order specified in the RFC. // are defined in the order specified in the RFC.
"aes128-ctr": {16, aes.BlockSize, 0, newAESCTR}, "aes128-ctr": {16, aes.BlockSize, streamCipherMode(0, newAESCTR)},
"aes192-ctr": {24, aes.BlockSize, 0, newAESCTR}, "aes192-ctr": {24, aes.BlockSize, streamCipherMode(0, newAESCTR)},
"aes256-ctr": {32, aes.BlockSize, 0, newAESCTR}, "aes256-ctr": {32, aes.BlockSize, streamCipherMode(0, newAESCTR)},
// Ciphers from RFC4345, which introduces security-improved arcfour ciphers. // Ciphers from RFC4345, which introduces security-improved arcfour ciphers.
// They are defined in the order specified in the RFC. // They are defined in the order specified in the RFC.
"arcfour128": {16, 0, 1536, newRC4}, "arcfour128": {16, 0, streamCipherMode(1536, newRC4)},
"arcfour256": {32, 0, 1536, newRC4}, "arcfour256": {32, 0, streamCipherMode(1536, newRC4)},
// Cipher defined in RFC 4253, which describes SSH Transport Layer Protocol. // Cipher defined in RFC 4253, which describes SSH Transport Layer Protocol.
// Note that this cipher is not safe, as stated in RFC 4253: "Arcfour (and // Note that this cipher is not safe, as stated in RFC 4253: "Arcfour (and
// RC4) has problems with weak keys, and should be used with caution." // RC4) has problems with weak keys, and should be used with caution."
// RFC4345 introduces improved versions of Arcfour. // RFC4345 introduces improved versions of Arcfour.
"arcfour": {16, 0, 0, newRC4}, "arcfour": {16, 0, streamCipherMode(0, newRC4)},
// AES-GCM is not a stream cipher, so it is constructed with a // AEAD ciphers
// special case. If we add any more non-stream ciphers, we gcmCipherID: {16, 12, newGCMCipher},
// should invest a cleaner way to do this. chacha20Poly1305ID: {64, 0, newChaCha20Cipher},
gcmCipherID: {16, 12, 0, nil},
// CBC mode is insecure and so is not included in the default config. // CBC mode is insecure and so is not included in the default config.
// (See http://www.isg.rhul.ac.uk/~kp/SandPfinal.pdf). If absolutely // (See http://www.isg.rhul.ac.uk/~kp/SandPfinal.pdf). If absolutely
// needed, it's possible to specify a custom Config to enable it. // needed, it's possible to specify a custom Config to enable it.
// You should expect that an active attacker can recover plaintext if // You should expect that an active attacker can recover plaintext if
// you do. // you do.
aes128cbcID: {16, aes.BlockSize, 0, nil}, aes128cbcID: {16, aes.BlockSize, newAESCBCCipher},
// 3des-cbc is insecure and is disabled by default. // 3des-cbc is insecure and is not included in the default
tripledescbcID: {24, des.BlockSize, 0, nil}, // config.
tripledescbcID: {24, des.BlockSize, newTripleDESCBCCipher},
} }
// prefixLen is the length of the packet prefix that contains the packet length // prefixLen is the length of the packet prefix that contains the packet length
@ -304,7 +307,7 @@ type gcmCipher struct {
buf []byte buf []byte
} }
func newGCMCipher(iv, key []byte) (packetCipher, error) { func newGCMCipher(key, iv, unusedMacKey []byte, unusedAlgs directionAlgorithms) (packetCipher, error) {
c, err := aes.NewCipher(key) c, err := aes.NewCipher(key)
if err != nil { if err != nil {
return nil, err return nil, err
@ -422,7 +425,7 @@ type cbcCipher struct {
oracleCamouflage uint32 oracleCamouflage uint32
} }
func newCBCCipher(c cipher.Block, iv, key, macKey []byte, algs directionAlgorithms) (packetCipher, error) { func newCBCCipher(c cipher.Block, key, iv, macKey []byte, algs directionAlgorithms) (packetCipher, error) {
cbc := &cbcCipher{ cbc := &cbcCipher{
mac: macModes[algs.MAC].new(macKey), mac: macModes[algs.MAC].new(macKey),
decrypter: cipher.NewCBCDecrypter(c, iv), decrypter: cipher.NewCBCDecrypter(c, iv),
@ -436,13 +439,13 @@ func newCBCCipher(c cipher.Block, iv, key, macKey []byte, algs directionAlgorith
return cbc, nil return cbc, nil
} }
func newAESCBCCipher(iv, key, macKey []byte, algs directionAlgorithms) (packetCipher, error) { func newAESCBCCipher(key, iv, macKey []byte, algs directionAlgorithms) (packetCipher, error) {
c, err := aes.NewCipher(key) c, err := aes.NewCipher(key)
if err != nil { if err != nil {
return nil, err return nil, err
} }
cbc, err := newCBCCipher(c, iv, key, macKey, algs) cbc, err := newCBCCipher(c, key, iv, macKey, algs)
if err != nil { if err != nil {
return nil, err return nil, err
} }
@ -450,13 +453,13 @@ func newAESCBCCipher(iv, key, macKey []byte, algs directionAlgorithms) (packetCi
return cbc, nil return cbc, nil
} }
func newTripleDESCBCCipher(iv, key, macKey []byte, algs directionAlgorithms) (packetCipher, error) { func newTripleDESCBCCipher(key, iv, macKey []byte, algs directionAlgorithms) (packetCipher, error) {
c, err := des.NewTripleDESCipher(key) c, err := des.NewTripleDESCipher(key)
if err != nil { if err != nil {
return nil, err return nil, err
} }
cbc, err := newCBCCipher(c, iv, key, macKey, algs) cbc, err := newCBCCipher(c, key, iv, macKey, algs)
if err != nil { if err != nil {
return nil, err return nil, err
} }
@ -627,3 +630,142 @@ func (c *cbcCipher) writePacket(seqNum uint32, w io.Writer, rand io.Reader, pack
return nil return nil
} }
const chacha20Poly1305ID = "chacha20-poly1305@openssh.com"
// chacha20Poly1305Cipher implements the chacha20-poly1305@openssh.com
// AEAD, which is described here:
//
// https://tools.ietf.org/html/draft-josefsson-ssh-chacha20-poly1305-openssh-00
//
// the methods here also implement padding, which RFC4253 Section 6
// also requires of stream ciphers.
type chacha20Poly1305Cipher struct {
lengthKey [32]byte
contentKey [32]byte
buf []byte
}
func newChaCha20Cipher(key, unusedIV, unusedMACKey []byte, unusedAlgs directionAlgorithms) (packetCipher, error) {
if len(key) != 64 {
panic(len(key))
}
c := &chacha20Poly1305Cipher{
buf: make([]byte, 256),
}
copy(c.contentKey[:], key[:32])
copy(c.lengthKey[:], key[32:])
return c, nil
}
// The Poly1305 key is obtained by encrypting 32 0-bytes.
var chacha20PolyKeyInput [32]byte
func (c *chacha20Poly1305Cipher) readPacket(seqNum uint32, r io.Reader) ([]byte, error) {
var counter [16]byte
binary.BigEndian.PutUint64(counter[8:], uint64(seqNum))
var polyKey [32]byte
chacha20.XORKeyStream(polyKey[:], chacha20PolyKeyInput[:], &counter, &c.contentKey)
encryptedLength := c.buf[:4]
if _, err := io.ReadFull(r, encryptedLength); err != nil {
return nil, err
}
var lenBytes [4]byte
chacha20.XORKeyStream(lenBytes[:], encryptedLength, &counter, &c.lengthKey)
length := binary.BigEndian.Uint32(lenBytes[:])
if length > maxPacket {
return nil, errors.New("ssh: invalid packet length, packet too large")
}
contentEnd := 4 + length
packetEnd := contentEnd + poly1305.TagSize
if uint32(cap(c.buf)) < packetEnd {
c.buf = make([]byte, packetEnd)
copy(c.buf[:], encryptedLength)
} else {
c.buf = c.buf[:packetEnd]
}
if _, err := io.ReadFull(r, c.buf[4:packetEnd]); err != nil {
return nil, err
}
var mac [poly1305.TagSize]byte
copy(mac[:], c.buf[contentEnd:packetEnd])
if !poly1305.Verify(&mac, c.buf[:contentEnd], &polyKey) {
return nil, errors.New("ssh: MAC failure")
}
counter[0] = 1
plain := c.buf[4:contentEnd]
chacha20.XORKeyStream(plain, plain, &counter, &c.contentKey)
padding := plain[0]
if padding < 4 {
// padding is a byte, so it automatically satisfies
// the maximum size, which is 255.
return nil, fmt.Errorf("ssh: illegal padding %d", padding)
}
if int(padding)+1 >= len(plain) {
return nil, fmt.Errorf("ssh: padding %d too large", padding)
}
plain = plain[1 : len(plain)-int(padding)]
return plain, nil
}
func (c *chacha20Poly1305Cipher) writePacket(seqNum uint32, w io.Writer, rand io.Reader, payload []byte) error {
var counter [16]byte
binary.BigEndian.PutUint64(counter[8:], uint64(seqNum))
var polyKey [32]byte
chacha20.XORKeyStream(polyKey[:], chacha20PolyKeyInput[:], &counter, &c.contentKey)
// There is no blocksize, so fall back to multiple of 8 byte
// padding, as described in RFC 4253, Sec 6.
const packetSizeMultiple = 8
padding := packetSizeMultiple - (1+len(payload))%packetSizeMultiple
if padding < 4 {
padding += packetSizeMultiple
}
// size (4 bytes), padding (1), payload, padding, tag.
totalLength := 4 + 1 + len(payload) + padding + poly1305.TagSize
if cap(c.buf) < totalLength {
c.buf = make([]byte, totalLength)
} else {
c.buf = c.buf[:totalLength]
}
binary.BigEndian.PutUint32(c.buf, uint32(1+len(payload)+padding))
chacha20.XORKeyStream(c.buf, c.buf[:4], &counter, &c.lengthKey)
c.buf[4] = byte(padding)
copy(c.buf[5:], payload)
packetEnd := 5 + len(payload) + padding
if _, err := io.ReadFull(rand, c.buf[5+len(payload):packetEnd]); err != nil {
return err
}
counter[0] = 1
chacha20.XORKeyStream(c.buf[4:], c.buf[4:packetEnd], &counter, &c.contentKey)
var mac [poly1305.TagSize]byte
poly1305.Sum(&mac, c.buf[:packetEnd], &polyKey)
copy(c.buf[packetEnd:], mac[:])
if _, err := w.Write(c.buf); err != nil {
return err
}
return nil
}

95
vendor/golang.org/x/crypto/ssh/client_auth.go generated vendored
View File

@ -11,6 +11,14 @@ import (
"io" "io"
) )
type authResult int
const (
authFailure authResult = iota
authPartialSuccess
authSuccess
)
// clientAuthenticate authenticates with the remote server. See RFC 4252. // clientAuthenticate authenticates with the remote server. See RFC 4252.
func (c *connection) clientAuthenticate(config *ClientConfig) error { func (c *connection) clientAuthenticate(config *ClientConfig) error {
// initiate user auth session // initiate user auth session
@ -37,11 +45,12 @@ func (c *connection) clientAuthenticate(config *ClientConfig) error {
if err != nil { if err != nil {
return err return err
} }
if ok { if ok == authSuccess {
// success // success
return nil return nil
} } else if ok == authFailure {
tried[auth.method()] = true tried[auth.method()] = true
}
if methods == nil { if methods == nil {
methods = lastMethods methods = lastMethods
} }
@ -82,7 +91,7 @@ type AuthMethod interface {
// If authentication is not successful, a []string of alternative // If authentication is not successful, a []string of alternative
// method names is returned. If the slice is nil, it will be ignored // method names is returned. If the slice is nil, it will be ignored
// and the previous set of possible methods will be reused. // and the previous set of possible methods will be reused.
auth(session []byte, user string, p packetConn, rand io.Reader) (bool, []string, error) auth(session []byte, user string, p packetConn, rand io.Reader) (authResult, []string, error)
// method returns the RFC 4252 method name. // method returns the RFC 4252 method name.
method() string method() string
@ -91,13 +100,13 @@ type AuthMethod interface {
// "none" authentication, RFC 4252 section 5.2. // "none" authentication, RFC 4252 section 5.2.
type noneAuth int type noneAuth int
func (n *noneAuth) auth(session []byte, user string, c packetConn, rand io.Reader) (bool, []string, error) { func (n *noneAuth) auth(session []byte, user string, c packetConn, rand io.Reader) (authResult, []string, error) {
if err := c.writePacket(Marshal(&userAuthRequestMsg{ if err := c.writePacket(Marshal(&userAuthRequestMsg{
User: user, User: user,
Service: serviceSSH, Service: serviceSSH,
Method: "none", Method: "none",
})); err != nil { })); err != nil {
return false, nil, err return authFailure, nil, err
} }
return handleAuthResponse(c) return handleAuthResponse(c)
@ -111,7 +120,7 @@ func (n *noneAuth) method() string {
// a function call, e.g. by prompting the user. // a function call, e.g. by prompting the user.
type passwordCallback func() (password string, err error) type passwordCallback func() (password string, err error)
func (cb passwordCallback) auth(session []byte, user string, c packetConn, rand io.Reader) (bool, []string, error) { func (cb passwordCallback) auth(session []byte, user string, c packetConn, rand io.Reader) (authResult, []string, error) {
type passwordAuthMsg struct { type passwordAuthMsg struct {
User string `sshtype:"50"` User string `sshtype:"50"`
Service string Service string
@ -125,7 +134,7 @@ func (cb passwordCallback) auth(session []byte, user string, c packetConn, rand
// The program may only find out that the user doesn't have a password // The program may only find out that the user doesn't have a password
// when prompting. // when prompting.
if err != nil { if err != nil {
return false, nil, err return authFailure, nil, err
} }
if err := c.writePacket(Marshal(&passwordAuthMsg{ if err := c.writePacket(Marshal(&passwordAuthMsg{
@ -135,7 +144,7 @@ func (cb passwordCallback) auth(session []byte, user string, c packetConn, rand
Reply: false, Reply: false,
Password: pw, Password: pw,
})); err != nil { })); err != nil {
return false, nil, err return authFailure, nil, err
} }
return handleAuthResponse(c) return handleAuthResponse(c)
@ -178,7 +187,7 @@ func (cb publicKeyCallback) method() string {
return "publickey" return "publickey"
} }
func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand io.Reader) (bool, []string, error) { func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand io.Reader) (authResult, []string, error) {
// Authentication is performed by sending an enquiry to test if a key is // 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 // 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 // attempt to authenticate with the valid key. If not the client will repeat
@ -186,13 +195,13 @@ func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand
signers, err := cb() signers, err := cb()
if err != nil { if err != nil {
return false, nil, err return authFailure, nil, err
} }
var methods []string var methods []string
for _, signer := range signers { for _, signer := range signers {
ok, err := validateKey(signer.PublicKey(), user, c) ok, err := validateKey(signer.PublicKey(), user, c)
if err != nil { if err != nil {
return false, nil, err return authFailure, nil, err
} }
if !ok { if !ok {
continue continue
@ -206,7 +215,7 @@ func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand
Method: cb.method(), Method: cb.method(),
}, []byte(pub.Type()), pubKey)) }, []byte(pub.Type()), pubKey))
if err != nil { if err != nil {
return false, nil, err return authFailure, nil, err
} }
// manually wrap the serialized signature in a string // manually wrap the serialized signature in a string
@ -224,24 +233,24 @@ func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand
} }
p := Marshal(&msg) p := Marshal(&msg)
if err := c.writePacket(p); err != nil { if err := c.writePacket(p); err != nil {
return false, nil, err return authFailure, nil, err
} }
var success bool var success authResult
success, methods, err = handleAuthResponse(c) success, methods, err = handleAuthResponse(c)
if err != nil { if err != nil {
return false, nil, err return authFailure, nil, err
} }
// If authentication succeeds or the list of available methods does not // If authentication succeeds or the list of available methods does not
// contain the "publickey" method, do not attempt to authenticate with any // contain the "publickey" method, do not attempt to authenticate with any
// other keys. According to RFC 4252 Section 7, the latter can occur when // other keys. According to RFC 4252 Section 7, the latter can occur when
// additional authentication methods are required. // additional authentication methods are required.
if success || !containsMethod(methods, cb.method()) { if success == authSuccess || !containsMethod(methods, cb.method()) {
return success, methods, err return success, methods, err
} }
} }
return false, methods, nil return authFailure, methods, nil
} }
func containsMethod(methods []string, method string) bool { func containsMethod(methods []string, method string) bool {
@ -318,28 +327,31 @@ func PublicKeysCallback(getSigners func() (signers []Signer, err error)) AuthMet
// handleAuthResponse returns whether the preceding authentication request succeeded // handleAuthResponse returns whether the preceding authentication request succeeded
// along with a list of remaining authentication methods to try next and // along with a list of remaining authentication methods to try next and
// an error if an unexpected response was received. // an error if an unexpected response was received.
func handleAuthResponse(c packetConn) (bool, []string, error) { func handleAuthResponse(c packetConn) (authResult, []string, error) {
for { for {
packet, err := c.readPacket() packet, err := c.readPacket()
if err != nil { if err != nil {
return false, nil, err return authFailure, nil, err
} }
switch packet[0] { switch packet[0] {
case msgUserAuthBanner: case msgUserAuthBanner:
if err := handleBannerResponse(c, packet); err != nil { if err := handleBannerResponse(c, packet); err != nil {
return false, nil, err return authFailure, nil, err
} }
case msgUserAuthFailure: case msgUserAuthFailure:
var msg userAuthFailureMsg var msg userAuthFailureMsg
if err := Unmarshal(packet, &msg); err != nil { if err := Unmarshal(packet, &msg); err != nil {
return false, nil, err return authFailure, nil, err
} }
return false, msg.Methods, nil if msg.PartialSuccess {
return authPartialSuccess, msg.Methods, nil
}
return authFailure, msg.Methods, nil
case msgUserAuthSuccess: case msgUserAuthSuccess:
return true, nil, nil return authSuccess, nil, nil
default: default:
return false, nil, unexpectedMessageError(msgUserAuthSuccess, packet[0]) return authFailure, nil, unexpectedMessageError(msgUserAuthSuccess, packet[0])
} }
} }
} }
@ -381,7 +393,7 @@ func (cb KeyboardInteractiveChallenge) method() string {
return "keyboard-interactive" return "keyboard-interactive"
} }
func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packetConn, rand io.Reader) (bool, []string, error) { func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packetConn, rand io.Reader) (authResult, []string, error) {
type initiateMsg struct { type initiateMsg struct {
User string `sshtype:"50"` User string `sshtype:"50"`
Service string Service string
@ -395,20 +407,20 @@ func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packe
Service: serviceSSH, Service: serviceSSH,
Method: "keyboard-interactive", Method: "keyboard-interactive",
})); err != nil { })); err != nil {
return false, nil, err return authFailure, nil, err
} }
for { for {
packet, err := c.readPacket() packet, err := c.readPacket()
if err != nil { if err != nil {
return false, nil, err return authFailure, nil, err
} }
// like handleAuthResponse, but with less options. // like handleAuthResponse, but with less options.
switch packet[0] { switch packet[0] {
case msgUserAuthBanner: case msgUserAuthBanner:
if err := handleBannerResponse(c, packet); err != nil { if err := handleBannerResponse(c, packet); err != nil {
return false, nil, err return authFailure, nil, err
} }
continue continue
case msgUserAuthInfoRequest: case msgUserAuthInfoRequest:
@ -416,18 +428,21 @@ func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packe
case msgUserAuthFailure: case msgUserAuthFailure:
var msg userAuthFailureMsg var msg userAuthFailureMsg
if err := Unmarshal(packet, &msg); err != nil { if err := Unmarshal(packet, &msg); err != nil {
return false, nil, err return authFailure, nil, err
} }
return false, msg.Methods, nil if msg.PartialSuccess {
return authPartialSuccess, msg.Methods, nil
}
return authFailure, msg.Methods, nil
case msgUserAuthSuccess: case msgUserAuthSuccess:
return true, nil, nil return authSuccess, nil, nil
default: default:
return false, nil, unexpectedMessageError(msgUserAuthInfoRequest, packet[0]) return authFailure, nil, unexpectedMessageError(msgUserAuthInfoRequest, packet[0])
} }
var msg userAuthInfoRequestMsg var msg userAuthInfoRequestMsg
if err := Unmarshal(packet, &msg); err != nil { if err := Unmarshal(packet, &msg); err != nil {
return false, nil, err return authFailure, nil, err
} }
// Manually unpack the prompt/echo pairs. // Manually unpack the prompt/echo pairs.
@ -437,7 +452,7 @@ func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packe
for i := 0; i < int(msg.NumPrompts); i++ { for i := 0; i < int(msg.NumPrompts); i++ {
prompt, r, ok := parseString(rest) prompt, r, ok := parseString(rest)
if !ok || len(r) == 0 { if !ok || len(r) == 0 {
return false, nil, errors.New("ssh: prompt format error") return authFailure, nil, errors.New("ssh: prompt format error")
} }
prompts = append(prompts, string(prompt)) prompts = append(prompts, string(prompt))
echos = append(echos, r[0] != 0) echos = append(echos, r[0] != 0)
@ -445,16 +460,16 @@ func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packe
} }
if len(rest) != 0 { if len(rest) != 0 {
return false, nil, errors.New("ssh: extra data following keyboard-interactive pairs") 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.User, msg.Instruction, prompts, echos)
if err != nil { if err != nil {
return false, nil, err return authFailure, nil, err
} }
if len(answers) != len(prompts) { if len(answers) != len(prompts) {
return false, nil, errors.New("ssh: not enough answers from keyboard-interactive callback") return authFailure, nil, errors.New("ssh: not enough answers from keyboard-interactive callback")
} }
responseLength := 1 + 4 responseLength := 1 + 4
for _, a := range answers { for _, a := range answers {
@ -470,7 +485,7 @@ func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packe
} }
if err := c.writePacket(serialized); err != nil { if err := c.writePacket(serialized); err != nil {
return false, nil, err return authFailure, nil, err
} }
} }
} }
@ -480,10 +495,10 @@ type retryableAuthMethod struct {
maxTries int maxTries int
} }
func (r *retryableAuthMethod) auth(session []byte, user string, c packetConn, rand io.Reader) (ok bool, methods []string, err error) { func (r *retryableAuthMethod) auth(session []byte, user string, c packetConn, rand io.Reader) (ok authResult, methods []string, err error) {
for i := 0; r.maxTries <= 0 || i < r.maxTries; i++ { 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)
if ok || err != nil { // either success or error terminate if ok != authFailure || err != nil { // either success, partial success or error terminate
return ok, methods, err return ok, methods, err
} }
} }

16
vendor/golang.org/x/crypto/ssh/common.go generated vendored
View File

@ -24,11 +24,21 @@ const (
serviceSSH = "ssh-connection" serviceSSH = "ssh-connection"
) )
// supportedCiphers specifies the supported ciphers in preference order. // supportedCiphers lists ciphers we support but might not recommend.
var supportedCiphers = []string{ var supportedCiphers = []string{
"aes128-ctr", "aes192-ctr", "aes256-ctr", "aes128-ctr", "aes192-ctr", "aes256-ctr",
"aes128-gcm@openssh.com", "aes128-gcm@openssh.com",
"arcfour256", "arcfour128", chacha20Poly1305ID,
"arcfour256", "arcfour128", "arcfour",
aes128cbcID,
tripledescbcID,
}
// preferredCiphers specifies the default preference for ciphers.
var preferredCiphers = []string{
"aes128-gcm@openssh.com",
chacha20Poly1305ID,
"aes128-ctr", "aes192-ctr", "aes256-ctr",
} }
// supportedKexAlgos specifies the supported key-exchange algorithms in // supportedKexAlgos specifies the supported key-exchange algorithms in
@ -211,7 +221,7 @@ func (c *Config) SetDefaults() {
c.Rand = rand.Reader c.Rand = rand.Reader
} }
if c.Ciphers == nil { if c.Ciphers == nil {
c.Ciphers = supportedCiphers c.Ciphers = preferredCiphers
} }
var ciphers []string var ciphers []string
for _, c := range c.Ciphers { for _, c := range c.Ciphers {

546
vendor/golang.org/x/crypto/ssh/knownhosts/knownhosts.go generated vendored Normal file
View File

@ -0,0 +1,546 @@
// Copyright 2017 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 knownhosts implements a parser for the OpenSSH
// known_hosts host key database.
package knownhosts
import (
"bufio"
"bytes"
"crypto/hmac"
"crypto/rand"
"crypto/sha1"
"encoding/base64"
"errors"
"fmt"
"io"
"net"
"os"
"strings"
"golang.org/x/crypto/ssh"
)
// See the sshd manpage
// (http://man.openbsd.org/sshd#SSH_KNOWN_HOSTS_FILE_FORMAT) for
// background.
type addr struct{ host, port string }
func (a *addr) String() string {
h := a.host
if strings.Contains(h, ":") {
h = "[" + h + "]"
}
return h + ":" + a.port
}
type matcher interface {
match([]addr) bool
}
type hostPattern struct {
negate bool
addr addr
}
func (p *hostPattern) String() string {
n := ""
if p.negate {
n = "!"
}
return n + p.addr.String()
}
type hostPatterns []hostPattern
func (ps hostPatterns) match(addrs []addr) bool {
matched := false
for _, p := range ps {
for _, a := range addrs {
m := p.match(a)
if !m {
continue
}
if p.negate {
return false
}
matched = true
}
}
return matched
}
// See
// https://android.googlesource.com/platform/external/openssh/+/ab28f5495c85297e7a597c1ba62e996416da7c7e/addrmatch.c
// The matching of * has no regard for separators, unlike filesystem globs
func wildcardMatch(pat []byte, str []byte) bool {
for {
if len(pat) == 0 {
return len(str) == 0
}
if len(str) == 0 {
return false
}
if pat[0] == '*' {
if len(pat) == 1 {
return true
}
for j := range str {
if wildcardMatch(pat[1:], str[j:]) {
return true
}
}
return false
}
if pat[0] == '?' || pat[0] == str[0] {
pat = pat[1:]
str = str[1:]
} else {
return false
}
}
}
func (p *hostPattern) match(a addr) bool {
return wildcardMatch([]byte(p.addr.host), []byte(a.host)) && p.addr.port == a.port
}
type keyDBLine struct {
cert bool
matcher matcher
knownKey KnownKey
}
func serialize(k ssh.PublicKey) string {
return k.Type() + " " + base64.StdEncoding.EncodeToString(k.Marshal())
}
func (l *keyDBLine) match(addrs []addr) bool {
return l.matcher.match(addrs)
}
type hostKeyDB struct {
// Serialized version of revoked keys
revoked map[string]*KnownKey
lines []keyDBLine
}
func newHostKeyDB() *hostKeyDB {
db := &hostKeyDB{
revoked: make(map[string]*KnownKey),
}
return db
}
func keyEq(a, b ssh.PublicKey) bool {
return bytes.Equal(a.Marshal(), b.Marshal())
}
// IsAuthorityForHost can be used as a callback in ssh.CertChecker
func (db *hostKeyDB) IsHostAuthority(remote ssh.PublicKey, address string) bool {
h, p, err := net.SplitHostPort(address)
if err != nil {
return false
}
a := addr{host: h, port: p}
for _, l := range db.lines {
if l.cert && keyEq(l.knownKey.Key, remote) && l.match([]addr{a}) {
return true
}
}
return false
}
// IsRevoked can be used as a callback in ssh.CertChecker
func (db *hostKeyDB) IsRevoked(key *ssh.Certificate) bool {
_, ok := db.revoked[string(key.Marshal())]
return ok
}
const markerCert = "@cert-authority"
const markerRevoked = "@revoked"
func nextWord(line []byte) (string, []byte) {
i := bytes.IndexAny(line, "\t ")
if i == -1 {
return string(line), nil
}
return string(line[:i]), bytes.TrimSpace(line[i:])
}
func parseLine(line []byte) (marker, host string, key ssh.PublicKey, err error) {
if w, next := nextWord(line); w == markerCert || w == markerRevoked {
marker = w
line = next
}
host, line = nextWord(line)
if len(line) == 0 {
return "", "", nil, errors.New("knownhosts: missing host pattern")
}
// ignore the keytype as it's in the key blob anyway.
_, line = nextWord(line)
if len(line) == 0 {
return "", "", nil, errors.New("knownhosts: missing key type pattern")
}
keyBlob, _ := nextWord(line)
keyBytes, err := base64.StdEncoding.DecodeString(keyBlob)
if err != nil {
return "", "", nil, err
}
key, err = ssh.ParsePublicKey(keyBytes)
if err != nil {
return "", "", nil, err
}
return marker, host, key, nil
}
func (db *hostKeyDB) parseLine(line []byte, filename string, linenum int) error {
marker, pattern, key, err := parseLine(line)
if err != nil {
return err
}
if marker == markerRevoked {
db.revoked[string(key.Marshal())] = &KnownKey{
Key: key,
Filename: filename,
Line: linenum,
}
return nil
}
entry := keyDBLine{
cert: marker == markerCert,
knownKey: KnownKey{
Filename: filename,
Line: linenum,
Key: key,
},
}
if pattern[0] == '|' {
entry.matcher, err = newHashedHost(pattern)
} else {
entry.matcher, err = newHostnameMatcher(pattern)
}
if err != nil {
return err
}
db.lines = append(db.lines, entry)
return nil
}
func newHostnameMatcher(pattern string) (matcher, error) {
var hps hostPatterns
for _, p := range strings.Split(pattern, ",") {
if len(p) == 0 {
continue
}
var a addr
var negate bool
if p[0] == '!' {
negate = true
p = p[1:]
}
if len(p) == 0 {
return nil, errors.New("knownhosts: negation without following hostname")
}
var err error
if p[0] == '[' {
a.host, a.port, err = net.SplitHostPort(p)
if err != nil {
return nil, err
}
} else {
a.host, a.port, err = net.SplitHostPort(p)
if err != nil {
a.host = p
a.port = "22"
}
}
hps = append(hps, hostPattern{
negate: negate,
addr: a,
})
}
return hps, nil
}
// KnownKey represents a key declared in a known_hosts file.
type KnownKey struct {
Key ssh.PublicKey
Filename string
Line int
}
func (k *KnownKey) String() string {
return fmt.Sprintf("%s:%d: %s", k.Filename, k.Line, serialize(k.Key))
}
// KeyError is returned if we did not find the key in the host key
// database, or there was a mismatch. Typically, in batch
// applications, this should be interpreted as failure. Interactive
// applications can offer an interactive prompt to the user.
type KeyError struct {
// Want holds the accepted host keys. For each key algorithm,
// there can be one hostkey. If Want is empty, the host is
// unknown. If Want is non-empty, there was a mismatch, which
// can signify a MITM attack.
Want []KnownKey
}
func (u *KeyError) Error() string {
if len(u.Want) == 0 {
return "knownhosts: key is unknown"
}
return "knownhosts: key mismatch"
}
// RevokedError is returned if we found a key that was revoked.
type RevokedError struct {
Revoked KnownKey
}
func (r *RevokedError) Error() string {
return "knownhosts: key is revoked"
}
// check checks a key against the host database. This should not be
// used for verifying certificates.
func (db *hostKeyDB) check(address string, remote net.Addr, remoteKey ssh.PublicKey) error {
if revoked := db.revoked[string(remoteKey.Marshal())]; revoked != nil {
return &RevokedError{Revoked: *revoked}
}
host, port, err := net.SplitHostPort(remote.String())
if err != nil {
return fmt.Errorf("knownhosts: SplitHostPort(%s): %v", remote, err)
}
addrs := []addr{
{host, port},
}
if address != "" {
host, port, err := net.SplitHostPort(address)
if err != nil {
return fmt.Errorf("knownhosts: SplitHostPort(%s): %v", address, err)
}
addrs = append(addrs, addr{host, port})
}
return db.checkAddrs(addrs, remoteKey)
}
// checkAddrs checks if we can find the given public key for any of
// the given addresses. If we only find an entry for the IP address,
// or only the hostname, then this still succeeds.
func (db *hostKeyDB) checkAddrs(addrs []addr, remoteKey ssh.PublicKey) error {
// TODO(hanwen): are these the right semantics? What if there
// is just a key for the IP address, but not for the
// hostname?
// Algorithm => key.
knownKeys := map[string]KnownKey{}
for _, l := range db.lines {
if l.match(addrs) {
typ := l.knownKey.Key.Type()
if _, ok := knownKeys[typ]; !ok {
knownKeys[typ] = l.knownKey
}
}
}
keyErr := &KeyError{}
for _, v := range knownKeys {
keyErr.Want = append(keyErr.Want, v)
}
// Unknown remote host.
if len(knownKeys) == 0 {
return keyErr
}
// If the remote host starts using a different, unknown key type, we
// also interpret that as a mismatch.
if known, ok := knownKeys[remoteKey.Type()]; !ok || !keyEq(known.Key, remoteKey) {
return keyErr
}
return nil
}
// The Read function parses file contents.
func (db *hostKeyDB) Read(r io.Reader, filename string) error {
scanner := bufio.NewScanner(r)
lineNum := 0
for scanner.Scan() {
lineNum++
line := scanner.Bytes()
line = bytes.TrimSpace(line)
if len(line) == 0 || line[0] == '#' {
continue
}
if err := db.parseLine(line, filename, lineNum); err != nil {
return fmt.Errorf("knownhosts: %s:%d: %v", filename, lineNum, err)
}
}
return scanner.Err()
}
// New creates a host key callback from the given OpenSSH host key
// files. The returned callback is for use in
// ssh.ClientConfig.HostKeyCallback.
func New(files ...string) (ssh.HostKeyCallback, error) {
db := newHostKeyDB()
for _, fn := range files {
f, err := os.Open(fn)
if err != nil {
return nil, err
}
defer f.Close()
if err := db.Read(f, fn); err != nil {
return nil, err
}
}
var certChecker ssh.CertChecker
certChecker.IsHostAuthority = db.IsHostAuthority
certChecker.IsRevoked = db.IsRevoked
certChecker.HostKeyFallback = db.check
return certChecker.CheckHostKey, nil
}
// Normalize normalizes an address into the form used in known_hosts
func Normalize(address string) string {
host, port, err := net.SplitHostPort(address)
if err != nil {
host = address
port = "22"
}
entry := host
if port != "22" {
entry = "[" + entry + "]:" + port
} else if strings.Contains(host, ":") && !strings.HasPrefix(host, "[") {
entry = "[" + entry + "]"
}
return entry
}
// Line returns a line to add append to the known_hosts files.
func Line(addresses []string, key ssh.PublicKey) string {
var trimmed []string
for _, a := range addresses {
trimmed = append(trimmed, Normalize(a))
}
return strings.Join(trimmed, ",") + " " + serialize(key)
}
// HashHostname hashes the given hostname. The hostname is not
// normalized before hashing.
func HashHostname(hostname string) string {
// TODO(hanwen): check if we can safely normalize this always.
salt := make([]byte, sha1.Size)
_, err := rand.Read(salt)
if err != nil {
panic(fmt.Sprintf("crypto/rand failure %v", err))
}
hash := hashHost(hostname, salt)
return encodeHash(sha1HashType, salt, hash)
}
func decodeHash(encoded string) (hashType string, salt, hash []byte, err error) {
if len(encoded) == 0 || encoded[0] != '|' {
err = errors.New("knownhosts: hashed host must start with '|'")
return
}
components := strings.Split(encoded, "|")
if len(components) != 4 {
err = fmt.Errorf("knownhosts: got %d components, want 3", len(components))
return
}
hashType = components[1]
if salt, err = base64.StdEncoding.DecodeString(components[2]); err != nil {
return
}
if hash, err = base64.StdEncoding.DecodeString(components[3]); err != nil {
return
}
return
}
func encodeHash(typ string, salt []byte, hash []byte) string {
return strings.Join([]string{"",
typ,
base64.StdEncoding.EncodeToString(salt),
base64.StdEncoding.EncodeToString(hash),
}, "|")
}
// See https://android.googlesource.com/platform/external/openssh/+/ab28f5495c85297e7a597c1ba62e996416da7c7e/hostfile.c#120
func hashHost(hostname string, salt []byte) []byte {
mac := hmac.New(sha1.New, salt)
mac.Write([]byte(hostname))
return mac.Sum(nil)
}
type hashedHost struct {
salt []byte
hash []byte
}
const sha1HashType = "1"
func newHashedHost(encoded string) (*hashedHost, error) {
typ, salt, hash, err := decodeHash(encoded)
if err != nil {
return nil, err
}
// The type field seems for future algorithm agility, but it's
// actually hardcoded in openssh currently, see
// https://android.googlesource.com/platform/external/openssh/+/ab28f5495c85297e7a597c1ba62e996416da7c7e/hostfile.c#120
if typ != sha1HashType {
return nil, fmt.Errorf("knownhosts: got hash type %s, must be '1'", typ)
}
return &hashedHost{salt: salt, hash: hash}, nil
}
func (h *hashedHost) match(addrs []addr) bool {
for _, a := range addrs {
if bytes.Equal(hashHost(Normalize(a.String()), h.salt), h.hash) {
return true
}
}
return false
}

58
vendor/golang.org/x/crypto/ssh/transport.go generated vendored
View File

@ -6,6 +6,7 @@ package ssh
import ( import (
"bufio" "bufio"
"bytes"
"errors" "errors"
"io" "io"
"log" "log"
@ -232,52 +233,22 @@ var (
clientKeys = direction{[]byte{'A'}, []byte{'C'}, []byte{'E'}} clientKeys = direction{[]byte{'A'}, []byte{'C'}, []byte{'E'}}
) )
// generateKeys generates key material for IV, MAC and encryption.
func generateKeys(d direction, algs directionAlgorithms, kex *kexResult) (iv, key, macKey []byte) {
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)
return
}
// setupKeys sets the cipher and MAC keys from kex.K, kex.H and sessionId, as // setupKeys sets the cipher and MAC keys from kex.K, kex.H and sessionId, as
// described in RFC 4253, section 6.4. direction should either be serverKeys // described in RFC 4253, section 6.4. direction should either be serverKeys
// (to setup server->client keys) or clientKeys (for client->server keys). // (to setup server->client keys) or clientKeys (for client->server keys).
func newPacketCipher(d direction, algs directionAlgorithms, kex *kexResult) (packetCipher, error) { func newPacketCipher(d direction, algs directionAlgorithms, kex *kexResult) (packetCipher, error) {
iv, key, macKey := generateKeys(d, algs, kex) cipherMode := cipherModes[algs.Cipher]
macMode := macModes[algs.MAC]
if algs.Cipher == gcmCipherID { iv := make([]byte, cipherMode.ivSize)
return newGCMCipher(iv, key) key := make([]byte, cipherMode.keySize)
} macKey := make([]byte, macMode.keySize)
if algs.Cipher == aes128cbcID { generateKeyMaterial(iv, d.ivTag, kex)
return newAESCBCCipher(iv, key, macKey, algs) generateKeyMaterial(key, d.keyTag, kex)
} generateKeyMaterial(macKey, d.macKeyTag, kex)
if algs.Cipher == tripledescbcID { return cipherModes[algs.Cipher].create(key, iv, macKey, algs)
return newTripleDESCBCCipher(iv, key, macKey, algs)
}
c := &streamPacketCipher{
mac: macModes[algs.MAC].new(macKey),
etm: macModes[algs.MAC].etm,
}
c.macResult = make([]byte, c.mac.Size())
var err error
c.cipher, err = cipherModes[algs.Cipher].createStream(key, iv)
if err != nil {
return nil, err
}
return c, nil
} }
// generateKeyMaterial fills out with key material generated from tag, K, H // generateKeyMaterial fills out with key material generated from tag, K, H
@ -342,7 +313,7 @@ func readVersion(r io.Reader) ([]byte, error) {
var ok bool var ok bool
var buf [1]byte var buf [1]byte
for len(versionString) < maxVersionStringBytes { for length := 0; length < maxVersionStringBytes; length++ {
_, err := io.ReadFull(r, buf[:]) _, err := io.ReadFull(r, buf[:])
if err != nil { if err != nil {
return nil, err return nil, err
@ -350,6 +321,13 @@ func readVersion(r io.Reader) ([]byte, error) {
// The RFC says that the version should be terminated with \r\n // The RFC says that the version should be terminated with \r\n
// but several SSH servers actually only send a \n. // but several SSH servers actually only send a \n.
if buf[0] == '\n' { if buf[0] == '\n' {
if !bytes.HasPrefix(versionString, []byte("SSH-")) {
// RFC 4253 says we need to ignore all version string lines
// except the one containing the SSH version (provided that
// all the lines do not exceed 255 bytes in total).
versionString = versionString[:0]
continue
}
ok = true ok = true
break break
} }

26
vendor/vendor.json vendored
View File

@ -2263,6 +2263,12 @@
"revision": "453249f01cfeb54c3d549ddb75ff152ca243f9d8", "revision": "453249f01cfeb54c3d549ddb75ff152ca243f9d8",
"revisionTime": "2017-02-08T20:51:15Z" "revisionTime": "2017-02-08T20:51:15Z"
}, },
{
"checksumSHA1": "hfABw6DX9B4Ma+88qDDGz9qY45s=",
"path": "golang.org/x/crypto/internal/chacha20",
"revision": "9de5f2eaf759b4c4550b3db39fed2e9e5f86f45c",
"revisionTime": "2018-02-11T11:39:43Z"
},
{ {
"checksumSHA1": "MCeXr2RNeiG1XG6V+er1OR0qyeo=", "checksumSHA1": "MCeXr2RNeiG1XG6V+er1OR0qyeo=",
"path": "golang.org/x/crypto/md4", "path": "golang.org/x/crypto/md4",
@ -2306,10 +2312,16 @@
"revisionTime": "2017-02-08T20:51:15Z" "revisionTime": "2017-02-08T20:51:15Z"
}, },
{ {
"checksumSHA1": "pySTR3iSeU7FhjbBnQPNxgyIa4I=", "checksumSHA1": "kVKE0OX1Xdw5mG7XKT86DLLKE2I=",
"path": "golang.org/x/crypto/poly1305",
"revision": "9de5f2eaf759b4c4550b3db39fed2e9e5f86f45c",
"revisionTime": "2018-02-11T11:39:43Z"
},
{
"checksumSHA1": "ZK4HWtg3hJzayz0RRcc6qHpkums=",
"path": "golang.org/x/crypto/ssh", "path": "golang.org/x/crypto/ssh",
"revision": "d585fd2cc9195196078f516b69daff6744ef5e84", "revision": "9de5f2eaf759b4c4550b3db39fed2e9e5f86f45c",
"revisionTime": "2017-12-16T04:08:15Z", "revisionTime": "2018-02-11T11:39:43Z",
"version": "master", "version": "master",
"versionExact": "master" "versionExact": "master"
}, },
@ -2321,6 +2333,14 @@
"version": "master", "version": "master",
"versionExact": "master" "versionExact": "master"
}, },
{
"checksumSHA1": "He3gVAAa2cym6sK3f2tgZoCMdOk=",
"path": "golang.org/x/crypto/ssh/knownhosts",
"revision": "650f4a345ab4e5b245a3034b110ebc7299e68186",
"revisionTime": "2017-09-27T09:16:38Z",
"version": "master",
"versionExact": "master"
},
{ {
"checksumSHA1": "9jjO5GjLa0XF/nfWihF02RoH4qc=", "checksumSHA1": "9jjO5GjLa0XF/nfWihF02RoH4qc=",
"path": "golang.org/x/net/context", "path": "golang.org/x/net/context",

6
website/docs/provisioners/connection.html.markdown
View File

@ -83,6 +83,9 @@ provisioner "file" {
* `agent_identity` - The preferred identity from the ssh agent for authentication. * `agent_identity` - The preferred identity from the ssh agent for authentication.
* `host_key` - The public key from the remote host or the signing CA, used to
verify the connection.
**Additional arguments only supported by the `winrm` connection type:** **Additional arguments only supported by the `winrm` connection type:**
* `https` - Set to `true` to connect using HTTPS instead of HTTP. * `https` - Set to `true` to connect using HTTPS instead of HTTP.
@ -100,6 +103,9 @@ The `ssh` connection also supports the following fields to facilitate connnectio
* `bastion_host` - Setting this enables the bastion Host connection. This host * `bastion_host` - Setting this enables the bastion Host connection. This host
will be connected to first, and then the `host` connection will be made from there. will be connected to first, and then the `host` connection will be made from there.
* `bastion_host_key` - The public key from the remote host or the signing CA,
used to verify the host connection.
* `bastion_port` - The port to use connect to the bastion host. Defaults to the * `bastion_port` - The port to use connect to the bastion host. Defaults to the
value of the `port` field. value of the `port` field.