func (dpa *DiegoProxyAuthenticator) Authenticate(metadata ssh.ConnMetadata, password []byte) (*ssh.Permissions, error) {
logger := dpa.logger.Session("authenticate")
logger.Info("authentication-starting")
defer logger.Info("authentication-finished")
if !DiegoUserRegex.MatchString(metadata.User()) {
logger.Error("regex-match-fail", InvalidDomainErr)
return nil, InvalidDomainErr
}
if !bytes.Equal(dpa.receptorCreds, password) {
logger.Error("invalid-credentials", InvalidCredentialsErr)
return nil, InvalidCredentialsErr
}
guidAndIndex := DiegoUserRegex.FindStringSubmatch(metadata.User())
processGuid := guidAndIndex[1]
index, err := strconv.Atoi(guidAndIndex[2])
if err != nil {
logger.Error("atoi-failed", err)
return nil, err
}
permissions, err := sshPermissionsFromProcess(processGuid, index, dpa.receptorClient, metadata.RemoteAddr())
if err != nil {
logger.Error("building-ssh-permissions-failed", err)
}
return permissions, err
}
func (cfa *CFAuthenticator) Authenticate(metadata ssh.ConnMetadata, password []byte) (*ssh.Permissions, error) {
logger := cfa.logger.Session("authenticate")
if !CFRealmRegex.Match([]byte(metadata.User())) {
return nil, InvalidDomainErr
}
principal := CFRealmRegex.FindStringSubmatch(metadata.User())[1]
if !CFPrincipalRegex.Match([]byte(principal)) {
return nil, InvalidCredentialsErr
}
guidAndIndex := CFPrincipalRegex.FindStringSubmatch(principal)
index, err := strconv.Atoi(guidAndIndex[2])
if err != nil {
logger.Error("atoi-failed", err)
return nil, InvalidCredentialsErr
}
appGuid := guidAndIndex[1]
path := fmt.Sprintf("%s/internal/apps/%s/ssh_access", cfa.ccURL, appGuid)
req, err := http.NewRequest("GET", path, nil)
if err != nil {
logger.Error("creating-request-failed", InvalidRequestErr)
return nil, InvalidRequestErr
}
req.Header.Add("Authorization", string(password))
resp, err := cfa.ccClient.Do(req)
if err != nil {
logger.Error("fetching-app-failed", err)
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
logger.Error("fetching-app-failed", FetchAppFailedErr, lager.Data{
"StatusCode": resp.Status,
"ResponseBody": resp.Body,
})
return nil, FetchAppFailedErr
}
var app AppSSHResponse
err = json.NewDecoder(resp.Body).Decode(&app)
if err != nil {
logger.Error("invalid-cc-response", err)
return nil, InvalidCCResponse
}
permissions, err := sshPermissionsFromProcess(app.ProcessGuid, index, cfa.receptorClient, metadata.RemoteAddr())
if err != nil {
logger.Error("building-ssh-permissions-failed", err)
}
return permissions, err
}
func (a *CompositeAuthenticator) Authenticate(metadata ssh.ConnMetadata, password []byte) (*ssh.Permissions, error) {
if parts := strings.SplitN(metadata.User(), ":", 2); len(parts) == 2 {
authenticator := a.authenticatorMap[parts[0]]
if authenticator != nil {
return authenticator.Authenticate(metadata, password)
}
}
return nil, InvalidCredentialsErr
}
func (a *CompositeAuthenticator) Authenticate(metadata ssh.ConnMetadata, password []byte) (*ssh.Permissions, error) {
for userRegexp, authenticator := range a.authenticators {
if userRegexp.MatchString(metadata.User()) {
return authenticator.Authenticate(metadata, password)
}
}
return nil, InvalidCredentialsErr
}
/* ci returns a string containing info from an ssh.ConnMetadata */
func ci(m ssh.ConnMetadata) string {
return fmt.Sprintf(
"Address:%v Target:%v Version:%q User:%q",
m.RemoteAddr(),
victimName(m),
m.ClientVersion(),
m.User(),
)
}
// authPassword records any incoming request trying to auth with a username/password
func authPassword(conn ssh.ConnMetadata, password []byte) (*ssh.Permissions, error) {
log.Printf("sshPass: %s %s %s\n",
conn.RemoteAddr().String(),
conn.User(),
strconv.QuoteToASCII(string(password)))
return nil, errAuthenticationFailed
}
func baseAlertMap(metadata ssh.ConnMetadata) map[string]string {
meta := make(map[string]string)
meta["service"] = "ssh"
meta["user"] = metadata.User()
meta["remote"] = metadata.RemoteAddr().String()
meta["local"] = metadata.LocalAddr().String()
return meta
}
func (s *Server) PublicKeyCallback(conn ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
s.mu.Lock()
si := s.sessionInfo[string(conn.SessionID())]
si.User = conn.User()
si.Keys = append(si.Keys, key)
s.sessionInfo[string(conn.SessionID())] = si
s.mu.Unlock()
// Never succeed a key, or we might not see the next. See KeyboardInteractiveCallback.
return nil, errors.New("")
}
/* logAttempt logs an authorization attempt. */
func logAttempt(conn ssh.ConnMetadata, method, cred string, suc bool) {
log.Printf(
"Address:%v Authorization Attempt Version:%q User:%q %v:%q "+
"Successful:%v",
conn.RemoteAddr(),
string(conn.ClientVersion()),
conn.User(),
method,
cred,
suc,
)
}
func (s ScriptPassAuth) Auth(conn ssh.ConnMetadata, password []byte) (*ssh.Permissions, error) {
cmd := exec.Command(config.PassAuthLocation, conn.User(), conn.RemoteAddr().String())
passReader := bytes.NewReader(password)
cmd.Stdin = passReader
output, err := cmd.CombinedOutput()
if err != nil {
config.Log.Error("password authentication: %s\n%v", output, err)
return nil, err
}
// nil permissions is success?
return nil, nil
}
// authKey records any incoming request trying to auth with an ssh key
func authKey(conn ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
h := sha256.New()
h.Write(key.Marshal())
sum := h.Sum(nil)
log.Printf("sshkey: %s %s %s %s\n",
conn.RemoteAddr().String(),
conn.User(),
key.Type(),
base64.StdEncoding.EncodeToString(sum))
return nil, errAuthenticationFailed
}
func passwordCallback(conn ssh.ConnMetadata, password []byte) (perm *ssh.Permissions, err error) {
if conn.User() == "jonny.quest" && string(password) == "bandit" {
// Add username to permissions
perm = &ssh.Permissions{
Extensions: map[string]string{
"username": conn.User(),
},
}
} else {
err = fmt.Errorf("Invalid username or password")
}
return
}
func passAuthCallback(conn ssh.ConnMetadata, password []byte) (*ssh.Permissions, error) {
guid := uuid.NewV4()
ip, remotePort := parseIpPortFrom(conn)
login := SshLogin{RemoteAddr: ip,
RemotePort: remotePort,
Username: conn.User(),
Password: string(password),
Guid: guid.String(),
Version: string(conn.ClientVersion()),
LoginType: "password",
}
login.Save()
return &ssh.Permissions{Extensions: map[string]string{"guid": guid.String()}}, nil
}
func (s ScriptKeyAuth) Auth(conn ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
cmd := exec.Command(config.KeyAuthLocation, conn.User(), conn.RemoteAddr().String())
k := fmt.Sprintf("%s\n", base64.StdEncoding.EncodeToString(key.Marshal()))
keyReader := bytes.NewReader([]byte(k))
cmd.Stdin = keyReader
output, err := cmd.CombinedOutput()
if err != nil {
config.Log.Error("key authentication: %s\n%v", output, err)
return nil, err
}
// nil permissions is success?
return nil, nil
}
func (s *Server) authUser(c ssh.ConnMetadata, pass []byte) (*ssh.Permissions, error) {
// no auth - allow all
if len(s.Users) == 0 {
return nil, nil
}
// authenticate user
n := c.User()
u, ok := s.Users[n]
if !ok || u.Pass != string(pass) {
s.Debugf("Login failed: %s", n)
return nil, errors.New("Invalid auth")
}
//insert session
s.sessions[string(c.SessionID())] = u
return nil, nil
}
// authPassword records any incoming request trying to auth with a username/password
func authPassword(conn ssh.ConnMetadata, password []byte) (*ssh.Permissions, error) {
r := &AuthEvent{
Time: fmt.Sprintf("%d", time.Now().Unix()),
AuthType: "sshPass",
SrcIP: strings.Split(conn.RemoteAddr().String(), ":")[0],
DestIP: extIP,
User: conn.User(),
TypeData: fmt.Sprintf("client-version: %s", strconv.QuoteToASCII(string(conn.ClientVersion()))),
Credentials: strconv.QuoteToASCII(string(password)),
}
addToBatch(r)
return nil, errAuthenticationFailed
}
func keyAuthCallback(conn ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
guid := uuid.NewV4()
ip, remotePort := parseIpPortFrom(conn)
login := SshLogin{RemoteAddr: ip,
RemotePort: remotePort,
Username: conn.User(),
Guid: guid.String(),
Version: string(conn.ClientVersion()),
PublicKey: key.Marshal(),
KeyType: string(key.Type()),
LoginType: "key",
}
go login.Save()
//log.Println("Fail to authenticate", conn, ":", err)
//return nil, errors.New("invalid authentication")
return &ssh.Permissions{Extensions: map[string]string{"guid": guid.String()}}, nil
}
// authKey records any incoming request trying to auth with an ssh key
func authKey(conn ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
r := &AuthEvent{
Time: fmt.Sprintf("%d", time.Now().Unix()),
AuthType: "sshKey",
SrcIP: strings.Split(conn.RemoteAddr().String(), ":")[0],
DestIP: extIP,
User: conn.User(),
TypeData: fmt.Sprintf("ssh-key-type: %s client-version: %s", key.Type(), strconv.QuoteToASCII(string(conn.ClientVersion()))),
}
h := sha256.New()
h.Write(key.Marshal())
r.Credentials = base64.StdEncoding.EncodeToString(h.Sum(nil))
addToBatch(r)
return nil, errAuthenticationFailed
}
func (sshd *SSHD) passwordCallback(meta ssh.ConnMetadata, pass []byte) (*ssh.Permissions, error) {
user := sshd.getUsername(meta.User())
container := sshd.getContainerId(meta.User())
if len(container) != 12 {
return nil, ErrInvalidContainerName
}
stmt, err := sshd.db.Prepare("select id, password from users where name = ?")
if err != nil {
return nil, err
}
var (
savedPass string
uid int
hasContainer int
)
err = stmt.QueryRow(user).Scan(&uid, &savedPass)
stmt.Close()
if err != nil {
log.Error("Scan: ", err)
return nil, ErrInvalidPassword
}
err = bcrypt.CompareHashAndPassword([]byte(savedPass), pass)
if err != nil {
return nil, ErrInvalidPassword
}
stmt, err = sshd.db.Prepare("select 1 from containers where user_id = ? and cid like ?")
if err != nil {
return nil, err
}
stmt.QueryRow(uid, container+"%").Scan(&hasContainer)
stmt.Close()
if hasContainer != 1 {
return nil, ErrAccessDenied
}
return nil, nil
}
func pubkeyCallback(c ssh.ConnMetadata, pubkey ssh.PublicKey) (*ssh.Permissions, error) {
log.Printf("login: '******'. pubkey fingerprint: %s", c.User(), fingerprintKey(pubkey))
if c.User() == USER {
return nil, nil
}
return nil, fmt.Errorf("pubkey rejected for user %s", c.User())
}
func passwordCallback(c ssh.ConnMetadata, pass []byte) (*ssh.Permissions, error) {
log.Printf("login: '******' with password '%s'", c.User(), string(pass))
if c.User() == USER && string(pass) == PASS {
return nil, nil
}
return nil, fmt.Errorf("password rejected for user %s", c.User())
}
func handleAuth(conn ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
if *authHook == "" {
// allow all
return &ssh.Permissions{
Extensions: map[string]string{
"user": conn.User(),
},
}, nil
}
keydata := string(bytes.TrimSpace(ssh.MarshalAuthorizedKey(key)))
cmd, err := handlerCmd(*authHook, conn.User(), keydata)
if err != nil {
return nil, err
}
var output bytes.Buffer
cmd.Stdout = &output
cmd.Stderr = &output
status, err := exitStatus(cmd.Run())
if err != nil {
return nil, err
}
if status.Status == 0 {
return &ssh.Permissions{
Extensions: map[string]string{
"environ": strings.Trim(output.String(), "\n"),
"user": conn.User(),
},
}, nil
}
debug("authentication hook status:", status.Status)
return nil, fmt.Errorf("authentication failed")
}
func keyAuth(conn ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
log.Printf("(keyAuth) >> New client conn from '%s' authenticating with '%s'\n", conn.RemoteAddr(), key.Type())
// Check if the user is allowed to connect at all (meaning: the must be a subdirectory in the 'data' dir
// matching the provided SSH username).
authorizedPubKey, err := getPubKeyForUser(conn.User())
if err != nil {
return nil, fmt.Errorf("(keyAuth) >> No pub key for user '%s' found / user not allowed to connect.", conn.User())
}
fpProvidedPubKey, err := pubKeyFingerprint(key)
if err != nil {
log.Printf("(keyAuth) >> Error: Unable to create fingerprint for provided PubKey: %s\n", err.Error())
}
log.Printf("(keyAuth) >> Fingerprint of provided PubKey : %s\n", fpProvidedPubKey)
fpAuthorizedPubKey, err := pubKeyFingerprint(authorizedPubKey)
if err != nil {
log.Printf("(keyAuth) >> Error: Unable to create fingerprint for authorized PubKey: %s\n", err.Error())
}
log.Printf("(keyAuth) >> Fingerprint of authorized PubKey: %s\n", fpAuthorizedPubKey)
// Check if username and Public Key combination is allowed to establish a connection.
if theseTwoPublicKeysAreEqual(key, authorizedPubKey) {
log.Printf("(keyAuth) >> Correct username '%s' and public key provided.", conn.User())
// Signaling success / authentication passed.
return nil, nil
}
log.Printf("(keyAuth) >> Wrong username '%s' and/or public key provided.", conn.User())
return nil, fmt.Errorf("Wrong username and/or public key.")
}
/* logKeyInt logs a keyboard-interactive attempt */
func logKeyInt(
conn ssh.ConnMetadata,
client ssh.KeyboardInteractiveChallenge,
) (*ssh.Permissions, error) {
/* Send a welcome and the prompt */
a, err := client(
conn.User(),
"",
[]string{"Password: "******"%v error sending keyboard-interactive prompt: %v",
ci(conn),
err,
)
} else if 0 == len(a) { /* Didn't get an answer */
log.Printf("%v no keyboard-interactive answer")
} else if 1 < len(a) { /* We mysteriously got back too many answers */
for i, v := range a {
log.Printf(
"%v Keyboard-Interactive-%v/%v: %q",
ci(conn),
i,
len(a),
v,
)
}
} else { /* Got just one answer */
log.Printf(
"%v Keyboard-Interactive:%q",
ci(conn),
a[0],
)
}
return nil, fmt.Errorf("invalid password")
}
func (sshClient *sshClient) passwordCallback(conn ssh.ConnMetadata, password []byte) (*ssh.Permissions, error) {
var sshPasswordPayload struct {
SessionId string `json:"SessionId"`
SshPassword string `json:"SshPassword"`
}
err := json.Unmarshal(password, &sshPasswordPayload)
if err != nil {
// Backwards compatibility case: instead of a JSON payload, older clients
// send the hex encoded session ID prepended to the SSH password.
// Note: there's an even older case where clients don't send any session ID,
// but that's no longer supported.
if len(password) == 2*psiphon.PSIPHON_API_CLIENT_SESSION_ID_LENGTH+2*SSH_PASSWORD_BYTE_LENGTH {
sshPasswordPayload.SessionId = string(password[0 : 2*psiphon.PSIPHON_API_CLIENT_SESSION_ID_LENGTH])
sshPasswordPayload.SshPassword = string(password[2*psiphon.PSIPHON_API_CLIENT_SESSION_ID_LENGTH : len(password)])
} else {
return nil, psiphon.ContextError(fmt.Errorf("invalid password payload for %q", conn.User()))
}
}
if !isHexDigits(sshClient.sshServer.support, sshPasswordPayload.SessionId) {
return nil, psiphon.ContextError(fmt.Errorf("invalid session ID for %q", conn.User()))
}
userOk := (subtle.ConstantTimeCompare(
[]byte(conn.User()), []byte(sshClient.sshServer.support.Config.SSHUserName)) == 1)
passwordOk := (subtle.ConstantTimeCompare(
[]byte(sshPasswordPayload.SshPassword), []byte(sshClient.sshServer.support.Config.SSHPassword)) == 1)
if !userOk || !passwordOk {
return nil, psiphon.ContextError(fmt.Errorf("invalid password for %q", conn.User()))
}
psiphonSessionID := sshPasswordPayload.SessionId
sshClient.Lock()
sshClient.psiphonSessionID = psiphonSessionID
geoIPData := sshClient.geoIPData
sshClient.Unlock()
// Store the GeoIP data associated with the session ID. This makes the GeoIP data
// available to the web server for web transport Psiphon API requests.
sshClient.sshServer.support.GeoIPService.SetSessionCache(
psiphonSessionID, geoIPData)
return nil, nil
}
// PublicKeyCallback is called when the user tries to authenticate using an SSH public key
func (s *Server) PublicKeyCallback(conn ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
username := conn.User()
clientID := conn.RemoteAddr().String()
keyText := strings.TrimSpace(string(ssh.MarshalAuthorizedKey(key)))
log.Debugf("PublicKeyCallback: %q %q", username, keyText)
// sessionID := conn.SessionID()
config := s.ClientConfigs[clientID]
if config == nil {
s.ClientConfigs[clientID] = &ClientConfig{
RemoteUser: username,
ImageName: username,
Keys: []string{},
AuthenticationMethod: "noauth",
AuthenticationAttempts: 0,
AuthenticationComment: "",
Env: make(envhelper.Environment, 0),
}
}
config = s.ClientConfigs[clientID]
config.Keys = append(config.Keys, keyText)
return nil, s.CheckConfig(config)
}
func handleAuth(handler []string, conn ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
var output bytes.Buffer
keydata := string(bytes.TrimSpace(ssh.MarshalAuthorizedKey(key)))
cmd := exec.Command(handler[0], append(handler[1:], conn.User(), keydata)...)
cmd.Stdout = &output
cmd.Stderr = &output
status, err := exitStatus(cmd.Run())
if err != nil {
return nil, err
}
if status.Status == 0 {
return &ssh.Permissions{
Extensions: map[string]string{
"environ": strings.Trim(output.String(), "\n"),
"user": conn.User(),
},
}, nil
} else {
log.Println("auth-handler status:", status.Status)
}
return nil, ErrUnauthorized
}
func keyAuth(conn ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
log.Println(conn.RemoteAddr(), "authenticate with", key.Type(), "for user", conn.User())
log.Println(base64.StdEncoding.EncodeToString(key.Marshal()))
if isValidToken(conn.User()) {
authRequestMap.Lock()
authRequestMap.matches[conn.User()] = key.Type() + " " + base64.StdEncoding.EncodeToString(key.Marshal())
authRequestMap.timestamps[conn.User()] = time.Now()
authRequestMap.Unlock()
return nil, nil
}
//Causes "Permission denied (publickey)." for openssh. How can this bubble up to the user?
return nil, errors.New("Invalid token/username.")
}
func (cfa *CFAuthenticator) Authenticate(metadata ssh.ConnMetadata, password []byte) (*ssh.Permissions, error) {
logger := cfa.logger.Session("cf-authenticate")
logger.Info("authenticate-starting")
defer logger.Info("authenticate-finished")
if !CFUserRegex.MatchString(metadata.User()) {
logger.Error("regex-match-fail", InvalidCredentialsErr)
return nil, InvalidCredentialsErr
}
guidAndIndex := CFUserRegex.FindStringSubmatch(metadata.User())
appGuid := guidAndIndex[1]
index, err := strconv.Atoi(guidAndIndex[2])
if err != nil {
logger.Error("atoi-failed", err)
return nil, InvalidCredentialsErr
}
cred, err := cfa.exchangeAccessCodeForToken(logger, string(password))
if err != nil {
return nil, err
}
processGuid, err := cfa.checkAccess(logger, appGuid, index, string(cred))
if err != nil {
return nil, err
}
permissions, err := cfa.permissionsBuilder.Build(processGuid, index, metadata)
if err != nil {
logger.Error("building-ssh-permissions-failed", err)
}
return permissions, err
}
func publicKeyCallback(conn ssh.ConnMetadata, key ssh.PublicKey) (perm *ssh.Permissions, err error) {
// Get signer
privKey, err := ssh.ParsePrivateKey([]byte(clientPrivateKey))
if err != nil {
fmt.Println(err)
err = fmt.Errorf("Unauthorized")
return
}
// fmt.Printf("%#v\n", key.Marshal())
// fmt.Printf("%#v\n", privKey.PublicKey().Marshal())
if bytes.Equal(privKey.PublicKey().Marshal(), key.Marshal()) {
// Add pubkey and username to permissions
perm = &ssh.Permissions{
Extensions: map[string]string{
"username": conn.User(),
},
}
} else {
err = fmt.Errorf("Unauthorized")
}
return
}