/
client.go
166 lines (141 loc) · 3.65 KB
/
client.go
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package issh
import (
//"flag"
"fmt"
"golang.org/x/crypto/ssh"
"golang.org/x/text/unicode/norm"
//"crypto"
"crypto/dsa"
"errors"
//"io"
//"log"
"math/big"
"os"
)
var params = new(dsa.Parameters)
func init() {
// DSA is, in fact, magic.
//
// The following parameters were generated by running the following:
//
// rand, err := os.Open("/dev/random")
// if err != nil {
// log.Fatal(err)
// }
// params := &dsa.Parameters{}
// dsa.GenerateParameters(params, rand, dsa.L1024N160)
p := new(big.Int)
q := new(big.Int)
g := new(big.Int)
p.SetString("130642166864071203463239656097142341904849140585061951688300554757362446260459711015276785142716962093655971678415305010178504645568749836389662343575542044953158554083710831561767706187442995193738502273669649751195940235762018514847090237231566556373715643322892832134201611037437507602732266200147426795869", 10)
q.SetString("866027036905107857165250601876454956505869932401", 10)
g.SetString("15284915559640922295701167939060760431573292860750463294432125788754593787689836410450118841587502197221502866876130530682745129044909044676364738263255648853955413358807735405761167385002477797988499139113209107838415780033584924889374456168509962142218427774887842421443178977675377807721820371439485027135", 10)
params.P = p
params.Q = q
params.G = g
}
type keyring struct {
key *dsa.PrivateKey
}
var KeyringError = errors.New("Invalid key specified")
/*
func (k *keyring) Key(i int) (ssh.PublicKey, error) {
if i != 0 {
return nil, nil
}
ssh_key, err := ssh.NewPublicKey(&k.key.PublicKey)
if err != nil {
return nil, err
}
return ssh_key, nil
}
func (k *keyring) Sign(i int, rand io.Reader, data []byte) ([]byte, error) {
hasher := crypto.SHA1.New()
hasher.Write(data)
digest := hasher.Sum(nil)
r, s, err := dsa.Sign(rand, k.key, digest)
if err != nil {
return nil, err
}
sig := make([]byte, 40)
rBytes := r.Bytes()
copy(sig[20-len(rBytes):], rBytes)
sBytes := s.Bytes()
copy(sig[40-len(sBytes):], sBytes)
return sig, nil
}
*/
func generateKey(seed_token string) (key *dsa.PrivateKey) {
g, p, q := params.G, params.P, params.Q
token_runes := norm.NFC.String(seed_token)
x := big.NewInt(0)
for _, run := range token_runes {
x.Lsh(x, 32)
x.Add(x, big.NewInt(int64(run)))
}
x.Mod(x, q)
y := big.NewInt(0)
y.Exp(g, x, p)
key = &dsa.PrivateKey{
PublicKey: dsa.PublicKey{
Parameters: dsa.Parameters{
G: g,
P: p,
Q: q,
},
Y: y,
},
X: x,
}
return
}
func GetAuthorizedKey(seed string) ([]byte, error) {
key := generateKey(seed)
ssh_key, err := ssh.NewPublicKey(&key.PublicKey)
if err != nil {
return nil, err
}
return ssh.MarshalAuthorizedKey(ssh_key), nil
}
func Run(username, hostname string, port uint16, seed string) ([]byte, int, error) {
key := generateKey(seed)
/*
config := &ssh.ClientConfig{
User: username,
Auth: []ssh.ClientAuth{
ssh.ClientAuthKeyring(&keyring{key: key}),
},
}
*/
signer, err := ssh.NewSignerFromKey(key)
if err != nil {
panic("Could not create a signer from the key: " + err.Error())
}
config := &ssh.ClientConfig{
User: username,
Auth: []ssh.AuthMethod{
ssh.PublicKeys(signer),
},
}
client, err := ssh.Dial("tcp", fmt.Sprintf("%s:%d", hostname, port), config)
if err != nil {
return nil, 0, err
}
defer client.Close()
session, err := client.NewSession()
if err != nil {
return nil, 0, err
}
defer session.Close()
bytes, err := session.Output("exit 1")
if err != nil {
if exiterror, ok := err.(*ssh.ExitError); ok {
return bytes, exiterror.ExitStatus(), nil
os.Stdout.Write(bytes)
os.Exit(exiterror.ExitStatus())
} else {
return nil, 0, err
}
}
return bytes, 0, nil
}