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x/crypto/ssh: Doesn't support AES-CBC #16327

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beauhoyt opened this issue Jul 12, 2016 · 2 comments
Closed

x/crypto/ssh: Doesn't support AES-CBC #16327

beauhoyt opened this issue Jul 12, 2016 · 2 comments

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@beauhoyt
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@beauhoyt beauhoyt commented Jul 12, 2016

  1. What version of Go are you using (go version)?

go version go1.6.2 darwin/amd64

  1. What operating system and processor architecture are you using (go env)?

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/beau/go"
GORACE=""
GOROOT="/usr/local/Cellar/go/1.6.2/libexec"
GOTOOLDIR="/usr/local/Cellar/go/1.6.2/libexec/pkg/tool/darwin_amd64"
GO15VENDOREXPERIMENT="1"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fno-common"
CXX="clang++"
CGO_ENABLED="1"

  1. What did you do?
    If possible, provide a recipe for reproducing the error.
    A complete runnable program is good.
    A link on play.golang.org is best.

Was trying to write a test to manage our Cisco IOS switch via SSH.

package main

import (
    "bytes"
    "fmt"
    "golang.org/x/crypto/ssh"
    "golang.org/x/crypto/ssh/agent"
    "net"
    "os"
)

func SSHAgent() ssh.AuthMethod {
    if sshAgent, err := net.Dial("unix", os.Getenv("SSh_AUTH_SOCK")); err == nil {
        return ssh.PublicKeysCallback(agent.NewClient(sshAgent).Signers)
    }
    return nil
}

func main() {
    config := &ssh.ClientConfig{
        User: "root",
        Auth: []ssh.AuthMethod{
            SSHAgent(),
        },
    }
    client, err := ssh.Dial("tcp", "asw01.sea01.office.priv:22", config)
    if err != nil {
        panic("Failed to dial: " + err.Error())
    }

    session, err := client.NewSession()
    if err != nil {
        panic("Failed to create session: " + err.Error())
    }

    var b bytes.Buffer
    session.Stdout = &b

    fmt.Println(b.String())
}
  1. What did you expect to see?




User Name:
  1. What did you see instead?
panic: Failed to dial: ssh: handshake failed: ssh: no common algorithm for client to server cipher; client offered: [aes128-ctr aes192-ctr aes256-ctr aes128-gcm@openssh.com arcfour256 arcfour128], server offered: [aes128-cbc 3des-cbc arcfour aes192-cbc aes256-cbc]

goroutine 1 [running]:
panic(0x1f1560, 0xc82000ab70)
    /usr/local/Cellar/go/1.6.2/libexec/src/runtime/panic.go:481 +0x3e6
main.main()
    /Users/beau/go/src/github.com/beauhoyt/test-ssh/main.go:28 +0x211
@bradfitz
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@bradfitz bradfitz commented Jul 12, 2016

You have to add "aes128-cbc" to your ssh.Config.Ciphers. It's disabled by default.

@bradfitz bradfitz closed this Jul 12, 2016
@beauhoyt
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@beauhoyt beauhoyt commented Jul 12, 2016

@bradfitz Thanks for the quick reply and solution :)

@golang golang locked and limited conversation to collaborators Jul 12, 2017
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