forked from git-lfs/git-lfs
/
ntlm.go
166 lines (134 loc) · 3.88 KB
/
ntlm.go
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package lfsapi
import (
"encoding/base64"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"strings"
"github.com/ThomsonReutersEikon/go-ntlm/ntlm"
"github.com/git-lfs/git-lfs/errors"
)
func (c *Client) doWithNTLM(req *http.Request, credHelper CredentialHelper, creds Creds, credsURL *url.URL) (*http.Response, error) {
res, err := c.Do(req)
if err != nil && !errors.IsAuthError(err) {
return res, err
}
if res.StatusCode != 401 {
return res, nil
}
return c.ntlmReAuth(req, credHelper, creds, true)
}
// If the status is 401 then we need to re-authenticate
func (c *Client) ntlmReAuth(req *http.Request, credHelper CredentialHelper, creds Creds, retry bool) (*http.Response, error) {
body, err := rewoundRequestBody(req)
if err != nil {
return nil, err
}
req.Body = body
chRes, challengeMsg, err := c.ntlmNegotiate(req, ntlmNegotiateMessage)
if err != nil {
return chRes, err
}
body, err = rewoundRequestBody(req)
if err != nil {
return nil, err
}
req.Body = body
res, err := c.ntlmChallenge(req, challengeMsg, creds)
if err != nil {
return res, err
}
switch res.StatusCode {
case 401:
credHelper.Reject(creds)
if retry {
return c.ntlmReAuth(req, credHelper, creds, false)
}
case 403:
credHelper.Reject(creds)
default:
if res.StatusCode < 300 && res.StatusCode > 199 {
credHelper.Approve(creds)
}
}
return res, nil
}
func (c *Client) ntlmNegotiate(req *http.Request, message string) (*http.Response, []byte, error) {
req.Header.Add("Authorization", message)
res, err := c.Do(req)
if err != nil && !errors.IsAuthError(err) {
return res, nil, err
}
io.Copy(ioutil.Discard, res.Body)
res.Body.Close()
by, err := parseChallengeResponse(res)
return res, by, err
}
func (c *Client) ntlmChallenge(req *http.Request, challengeBytes []byte, creds Creds) (*http.Response, error) {
challenge, err := ntlm.ParseChallengeMessage(challengeBytes)
if err != nil {
return nil, err
}
session, err := c.ntlmClientSession(creds)
if err != nil {
return nil, err
}
session.ProcessChallengeMessage(challenge)
authenticate, err := session.GenerateAuthenticateMessage()
if err != nil {
return nil, err
}
authMsg := base64.StdEncoding.EncodeToString(authenticate.Bytes())
req.Header.Set("Authorization", "NTLM "+authMsg)
return c.Do(req)
}
func (c *Client) ntlmClientSession(creds Creds) (ntlm.ClientSession, error) {
c.ntlmMu.Lock()
defer c.ntlmMu.Unlock()
splits := strings.Split(creds["username"], "\\")
if len(splits) != 2 {
return nil, fmt.Errorf("Your user name must be of the form DOMAIN\\user. It is currently %s", creds["username"])
}
domain := strings.ToUpper(splits[0])
username := splits[1]
if c.ntlmSessions == nil {
c.ntlmSessions = make(map[string]ntlm.ClientSession)
}
if ses, ok := c.ntlmSessions[domain]; ok {
return ses, nil
}
session, err := ntlm.CreateClientSession(ntlm.Version2, ntlm.ConnectionOrientedMode)
if err != nil {
return nil, err
}
session.SetUserInfo(username, creds["password"], strings.ToUpper(splits[0]))
c.ntlmSessions[domain] = session
return session, nil
}
func parseChallengeResponse(res *http.Response) ([]byte, error) {
header := res.Header.Get("Www-Authenticate")
if len(header) < 6 {
return nil, fmt.Errorf("Invalid NTLM challenge response: %q", header)
}
//parse out the "NTLM " at the beginning of the response
challenge := header[5:]
val, err := base64.StdEncoding.DecodeString(challenge)
if err != nil {
return nil, err
}
return []byte(val), nil
}
func rewoundRequestBody(req *http.Request) (io.ReadCloser, error) {
if req.Body == nil {
return nil, nil
}
body, ok := req.Body.(ReadSeekCloser)
if !ok {
return nil, fmt.Errorf("Request body must implement io.ReadCloser and io.Seeker. Got: %T", body)
}
_, err := body.Seek(0, io.SeekStart)
return body, err
}
const ntlmNegotiateMessage = "NTLM TlRMTVNTUAABAAAAB7IIogwADAAzAAAACwALACgAAAAKAAAoAAAAD1dJTExISS1NQUlOTk9SVEhBTUVSSUNB"