Hi,
To start off I'm fairly new to Go, I would just like to know the following:
If I make changes similar to yours in common.go, how would I be able to
make use of them in my main package.
For example in my common.go file I added the following
==== common.go ====
func returnCiphers() []string {
return supportedCiphers
}
In my main package, how will I call it as the following does not seem to
work:
==== main.go ====
fmt.Println(ssh.returnCiphers())
Assistance will greatly be appreciated.
On Sunday, July 21, 2013 at 4:29:25 AM UTC+2, Dennis Francis wrote:
>
> Hi all,
>
>
> I used the following code (derived from
> https://github.com/davecheney/socksie/blob/master/main.go) which uses the
> SSHAgent support in the ssh package
> to provide authentication to connect to a sftp server.
>
>
> ===========[test.go]========================================
> package main
>
> import (
> "code.google.com/p/go.crypto/ssh"
> "flag"
> "fmt"
> "log"
> "net"
> "os"
> )
>
> var (
> USER = flag.String("user", os.Getenv("USER"), "ssh username")
> HOST = flag.String("host", "127.0.0.1", "ssh server hostname")
> PASS = flag.String("pass", "", "ssh password")
> )
>
> func init() { flag.Parse() }
>
>
> //password implements the ClientPassword
> interface
>
>
>
> type password string
>
> func (p password) Password(user string) (string, error) {
> return string(p), nil
> }
>
>
> func main() {
>
> var auths []ssh.ClientAuth
> if agent, err := net.Dial("unix", os.Getenv("SSH_AUTH_SOCK")); err ==
> nil {
> fmt.Println("ssh-agent")
> auths = append(auths,
> ssh.ClientAuthAgent(ssh.NewAgentClient(agent)))
> }
> if *PASS != "" {
> auths = append(auths, ssh.ClientAuthPassword(password(*PASS)))
> }
>
> config := &ssh.ClientConfig{
>
> User: *USER,
> Auth: auths,
> }
> addr := fmt.Sprintf("%s:%d", *HOST, 22)
> conn, err := ssh.Dial("tcp", addr, config)
> if err != nil {
> log.Fatalf("unable to connect to [%s]: %v", addr, err)
> }
> defer conn.Close()
>
> }
>
>
> ============================================================================
>
> I also added the following debug statement to
> code.google.com/p/go.crypto/ssh/common.go
>
> func findCommonCipher(clientCiphers []string, serverCiphers []string)
> (commonCipher string, ok bool) {
> for _, clientCipher := range clientCiphers {
> for _, serverCipher := range serverCiphers {
> // reject the cipher if we have no cipherModes
> definition
>
>
> if clientCipher == serverCipher && cipherModes[clientCipher]
> != nil {
> return clientCipher, true
> }
> }
> }
> fmt.Println("no common cipher clientCiphers=", clientCiphers,
> "serverCiphers=", serverCiphers)
> return
> }
>
> Output
> ======
>
> myhost ~ $ ./test -host <server> -user <username>
> ssh-agent
> no common cipher clientCiphers= [aes128-ctr aes192-ctr aes256-ctr
> arcfour256 arcfour128] serverCiphers= [aes128-cbc blowfish-cbc aes256-cbc
> aes192-cbc 3des-cbc]
> No common writer cipher Algo
> 2013/07/20 22:01:33 unable to connect to [<server>:22]: handshake failed:
> ssh: no common algorithms
>
>
> I see that from the ssh/cipher.go that there is no support for *-cbc
> ciphers, so I like to add support for these.
>
> I see from crypto/cipher pkg, that CBC ciphers have different encrypter
> and decrypter functions and the ssh/cipher.go/createCipher() function
> doesn't have an indicator that specifies whether the current operation is
> encryption or decryption.
>
> Can someone give a clue on how to add cbc cipher support to ssh/cipher.go ?
>
> Thanks a lot,
> Dennis
>
>
>
>
>
>
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