Class: Metasploit::Framework::LoginScanner::Kerberos

Inherits:
Object
  • Object
show all
Includes:
Base, Msf::Exploit::Remote::Kerberos::Client
Defined in:
lib/metasploit/framework/login_scanner/kerberos.rb

Overview

Kerberos User scanner

Constant Summary collapse

DEFAULT_PORT = 
88
REALM_KEY = 
Metasploit::Model::Realm::Key::ACTIVE_DIRECTORY_DOMAIN
DEFAULT_REALM = 
nil
LIKELY_PORTS = 
[ DEFAULT_PORT ].freeze
LIKELY_SERVICE_NAMES = 
[ 'kerberos', 'kerberos5', 'krb5', 'kerberos-sec' ].freeze
PRIVATE_TYPES = 
%i[ password ].freeze
CAN_GET_SESSION = 
true

Constants included from Msf::Exploit::Remote::Kerberos::Client

Msf::Exploit::Remote::Kerberos::Client::NEG_TOKEN_ACCEPT_COMPLETED, Msf::Exploit::Remote::Kerberos::Client::NEG_TOKEN_ACCEPT_INCOMPLETE, Msf::Exploit::Remote::Kerberos::Client::NEG_TOKEN_REJECT, Msf::Exploit::Remote::Kerberos::Client::NEG_TOKEN_REQUEST_MIC, Msf::Exploit::Remote::Kerberos::Client::TOK_ID_KRB_AP_REP, Msf::Exploit::Remote::Kerberos::Client::TOK_ID_KRB_AP_REQ, Msf::Exploit::Remote::Kerberos::Client::TOK_ID_KRB_ERROR

Constants included from Msf::Exploit::Remote::Kerberos::Client::ApRequest

Msf::Exploit::Remote::Kerberos::Client::ApRequest::AP_MUTUAL_REQUIRED, Msf::Exploit::Remote::Kerberos::Client::ApRequest::AP_USE_SESSION_KEY

Instance Attribute Summary collapse

Attributes included from Msf::Exploit::Remote::Kerberos::Client

#client, #kerberos_client

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Msf::Exploit::Remote::Kerberos::Client

#cleanup, #connect, #disconnect, #framework_module, #initialize, #peer, #proxies, #select_cipher, #send_request_as, #send_request_tgs, #send_request_tgt, #send_request_tgt_pkinit

Methods included from Msf::Exploit::Remote::Kerberos::Client::Pkinit

#build_dh, #build_pa_pk_as_req, #calculate_shared_key, #extract_user_and_realm, #k_truncate, #sign_auth_pack

Methods included from Msf::Exploit::Remote::Kerberos::Client::Pac

#build_empty_auth_data, #build_pa_pac_request, #build_pac, #build_pac_authorization_data

Methods included from Msf::Exploit::Remote::Kerberos::Client::TgsResponse

#decrypt_kdc_tgs_rep_enc_part, #extract_kerb_creds

Methods included from Msf::Exploit::Remote::Kerberos::Client::TgsRequest

#build_ap_req, #build_authenticator, #build_enc_auth_data, #build_pa_for_user, #build_subkey, #build_tgs_body_checksum, #build_tgs_request, #build_tgs_request_body

Methods included from Msf::Exploit::Remote::Kerberos::Client::AsResponse

#decrypt_kdc_as_rep_enc_part, #extract_logon_time, #extract_session_key, #format_as_rep_to_john_hash

Methods included from Msf::Exploit::Remote::Kerberos::Client::AsRequest

#build_as_pa_time_stamp, #build_as_request, #build_as_request_body

Methods included from Msf::Exploit::Remote::Kerberos::Client::ApRequest

#build_service_ap_request, #encode_gss_kerberos_ap_request, #encode_gss_spnego_ap_request

Methods included from Msf::Exploit::Remote::Kerberos::Client::Base

#build_client_name, #build_server_name

Instance Attribute Details

#server_name ⇒ Object

Returns the value of attribute server_name.



68
69
70
 
# File 'lib/metasploit/framework/login_scanner/kerberos.rb', line 68

def server_name
  @server_name
end

Class Method Details

.login_status_for_kerberos_error(krb_err) ⇒ Object

Parameters:



76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
 
# File 'lib/metasploit/framework/login_scanner/kerberos.rb', line 76

def self.(krb_err)
  error_code = krb_err.error_code
  case error_code
  when Rex::Proto::Kerberos::Model::Error::ErrorCodes::KDC_ERR_KEY_EXPIRED, Rex::Proto::Kerberos::Model::Error::ErrorCodes::KRB_AP_ERR_SKEW
    # Correct password, but either password needs resetting or clock is skewed
    Metasploit::Model::Login::Status::SUCCESSFUL
  when Rex::Proto::Kerberos::Model::Error::ErrorCodes::KDC_ERR_C_PRINCIPAL_UNKNOWN
    # The username doesn't exist
    Metasploit::Model::Login::Status::INVALID_PUBLIC_PART
  when Rex::Proto::Kerberos::Model::Error::ErrorCodes::KDC_ERR_CLIENT_REVOKED
    # Locked out, disabled or expired
    # It doesn't appear to be documented anywhere, but Microsoft gives us a bit
    # of extra information in the e-data section
    begin
      pa_data_entry = krb_err.res.e_data_as_pa_data_entry
      if pa_data_entry && pa_data_entry.type == Rex::Proto::Kerberos::Model::PreAuthType::PA_PW_SALT
        pw_salt = pa_data_entry.decoded_value
        if pw_salt.nt_status
          case pw_salt.nt_status.value
          when ::WindowsError::NTStatus::STATUS_ACCOUNT_LOCKED_OUT
            Metasploit::Model::Login::Status::LOCKED_OUT
          when ::WindowsError::NTStatus::STATUS_ACCOUNT_DISABLED
            Metasploit::Model::Login::Status::DISABLED
          when ::WindowsError::NTStatus::STATUS_ACCOUNT_EXPIRED
            # Actually expired, which is effectively Disabled
            Metasploit::Model::Login::Status::DISABLED
          else
            # Unknown - maintain existing behaviour
            Metasploit::Model::Login::Status::DISABLED
          end
        else
          Metasploit::Model::Login::Status::DISABLED
        end
      else
          Metasploit::Model::Login::Status::DISABLED
      end
    rescue Rex::Proto::Kerberos::Model::Error::KerberosDecodingError
      # Could be a non-MS implementation?
      Metasploit::Model::Login::Status::DISABLED
    end
  else
    Metasploit::Model::Login::Status::INCORRECT
  end
end

Instance Method Details

#attempt_login(credential) ⇒ Object 



20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
 
# File 'lib/metasploit/framework/login_scanner/kerberos.rb', line 20

def (credential)
  result_options = {
    credential: credential,
    host: host,
    port: port,
    protocol: 'tcp',
    service_name: 'kerberos'
  }

  begin
    res = send_request_tgt(
      server_name: server_name,
      client_name: credential.public,
      password: credential.private,
      realm: credential.realm
    )
    unless res.preauth_required
      # Pre-auth not required - let's get an RC4-HMAC ticket, since it's more easily crackable
      begin
        res = send_request_tgt(
          server_name: server_name,
          client_name: credential.public,
          password: credential.private,
          realm: credential.realm,
          offered_etypes: [Rex::Proto::Kerberos::Crypto::Encryption::RC4_HMAC]
        )
      rescue Rex::Proto::Kerberos::Model::Error::KerberosEncryptionNotSupported => e
        # RC4 likely disabled - let's just use the initial response
      end
    end

    result_options = result_options.merge(
      {
        status: Metasploit::Model::Login::Status::SUCCESSFUL,
        proof: res
      }
    )
    return Metasploit::Framework::LoginScanner::Result.new(result_options)
  rescue ::EOFError => e
    result_options = result_options.merge({ status: Metasploit::Model::Login::Status::UNABLE_TO_CONNECT, proof: e })
    return Metasploit::Framework::LoginScanner::Result.new(result_options)
  rescue Rex::Proto::Kerberos::Model::Error::KerberosError => e
    status = self.class.(e)
    result_options = result_options.merge({ status: status, proof: e })
    return Metasploit::Framework::LoginScanner::Result.new(result_options)
  end
end