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package main
import (
"bytes"
"crypto/tls"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net"
"net/http"
"net/url"
"os"
"os/user"
"path"
"time"
"github.com/nsheridan/cashier/lib"
"github.com/pkg/browser"
"github.com/spf13/pflag"
"golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/agent"
)
var (
u, _ = user.Current()
cfg = pflag.String("config", path.Join(u.HomeDir, ".cashier.conf"), "Path to config file")
ca = pflag.String("ca", "http://localhost:10000", "CA server")
keysize = pflag.Int("key_size", 2048, "Key size. Ignored for ed25519 keys")
validity = pflag.Duration("validity", time.Hour*24, "Key validity")
keytype = pflag.String("key_type", "rsa", "Type of private key to generate - rsa, ecdsa or ed25519")
)
func installCert(a agent.Agent, cert *ssh.Certificate, key key) error {
lifetime := time.Unix(int64(cert.ValidBefore), 0).Sub(time.Now()).Seconds()
pubcert := agent.AddedKey{
PrivateKey: key,
Certificate: cert,
Comment: cert.KeyId,
LifetimeSecs: uint32(lifetime),
}
if err := a.Add(pubcert); err != nil {
return fmt.Errorf("error importing certificate: %s", err)
}
privkey := agent.AddedKey{
PrivateKey: key,
Comment: cert.KeyId,
LifetimeSecs: uint32(lifetime),
}
if err := a.Add(privkey); err != nil {
return fmt.Errorf("error importing key: %s", err)
}
return nil
}
func send(s []byte, token, ca string, ValidateTLSCertificate bool) (*lib.SignResponse, error) {
transport := &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: !ValidateTLSCertificate},
}
client := &http.Client{Transport: transport}
u, err := url.Parse(ca)
if err != nil {
return nil, err
}
u.Path = path.Join(u.Path, "/sign")
req, err := http.NewRequest("POST", u.String(), bytes.NewReader(s))
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
req.Header.Add("Accept", "application/json")
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token))
resp, err := client.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("Bad response from server: %s", resp.Status)
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
c := &lib.SignResponse{}
if err := json.Unmarshal(body, c); err != nil {
return nil, err
}
return c, nil
}
func sign(pub ssh.PublicKey, token string, conf *config) (*ssh.Certificate, error) {
validity, err := time.ParseDuration(conf.Validity)
if err != nil {
return nil, err
}
marshaled := ssh.MarshalAuthorizedKey(pub)
marshaled = marshaled[:len(marshaled)-1]
s, err := json.Marshal(&lib.SignRequest{
Key: string(marshaled),
ValidUntil: time.Now().Add(validity),
})
if err != nil {
return nil, err
}
resp, err := send(s, token, conf.CA, conf.ValidateTLSCertificate)
if err != nil {
return nil, err
}
if resp.Status != "ok" {
return nil, fmt.Errorf("error: %s", resp.Response)
}
k, _, _, _, err := ssh.ParseAuthorizedKey([]byte(resp.Response))
if err != nil {
return nil, err
}
cert, ok := k.(*ssh.Certificate)
if !ok {
return nil, fmt.Errorf("did not receive a certificate from server")
}
return cert, nil
}
func main() {
pflag.Parse()
c, err := readConfig(*cfg)
if err != nil {
log.Fatalf("Error parsing config file: %v\n", err)
}
fmt.Printf("Your browser has been opened to visit %s\n", c.CA)
if err := browser.OpenURL(c.CA); err != nil {
fmt.Println("Error launching web browser. Go to the link in your web browser")
}
fmt.Println("Generating new key pair")
priv, pub, err := generateKey(c.Keytype, c.Keysize)
if err != nil {
log.Fatalln("Error generating key pair: ", err)
}
fmt.Print("Enter token: ")
var token string
fmt.Scanln(&token)
cert, err := sign(pub, token, c)
if err != nil {
log.Fatalln(err)
}
sock, err := net.Dial("unix", os.Getenv("SSH_AUTH_SOCK"))
if err != nil {
log.Fatalln("Error connecting to agent: %s", err)
}
defer sock.Close()
a := agent.NewClient(sock)
if err := installCert(a, cert, priv); err != nil {
log.Fatalln(err)
}
fmt.Println("Credentials added.")
}
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