Kerberos
The kerberos package is a C++ extension for Node.js that provides cross-platform support for kerberos authentication using GSSAPI on linux/osx, and SSPI on windows. Much of the code in this module is adapted from ccs-kerberos and winkerberos.
Requirements
Linux
pythonv2.7make- A proper C/C++ compiler toolchain, like GCC
- Distribution-specific kerberos packages (e.g.
krb5-devon Ubuntu)
macOS
Xcode Command Line Tools: Can be installed withxcode-select --install- Distribution-specific kerberos packages (e.g.
krb5on Homebrew)
Windows
-
Option 1: Install all the required tools and configurations using Microsoft's windows-build-tools by running
npm install -g windows-build-toolsfrom an elevated PowerShell (run as Administrator). -
Option 2: Install dependencies and configuration manually
- Visual C++ Build Environment:
- Option 1: Install Visual C++ Build Tools using the Default Install option.
- Option 2: Install Visual Studio 2015 (or modify an existing installation) and select Common Tools for Visual C++ during setup.
๐ก [Windows Vista / 7 only] requires .NET Framework 4.5.1- Install Python 2.7 or Miniconda 2.7 (
v3.x.xis not supported), and runnpm config set python python2.7 - Launch cmd,
npm config set msvs_version 2015
Installation
Now you can install kerberos with the following:
npm install kerberosTesting
Run the test suite using:
npm testNOTE: The test suite requires an active kerberos deployment, see test/scripts/travis.sh to better understand these requirements.
Documentation
Classes
Functions
- checkPassword(username, password, service, [defaultRealm], [callback]) โ
Promise This function provides a simple way to verify that a user name and password match those normally used for Kerberos authentication. It does this by checking that the supplied user name and password can be used to get a ticket for the supplied service. If the user name does not contain a realm, then the default realm supplied is used.
For this to work properly the Kerberos must be configured properly on this machine. That will likely mean ensuring that the edu.mit.Kerberos preference file has the correct realms and KDCs listed.
IMPORTANT: This method is vulnerable to KDC spoofing attacks and it should only be used for testing. Do not use this in any production system - your security could be compromised if you do.
- principalDetails(service, hostname, [callback]) โ
Promise This function returns the service principal for the server given a service type and hostname.
Details are looked up via the
/etc/keytabfile.- initializeClient(service, [options], [callback]) โ
Promise Initializes a context for client-side authentication with the given service principal.
- initializeServer(service, [callback]) โ
Promise Initializes a context for server-side authentication with the given service principal.
KerberosClient
Properties
| Name | Type | Description |
|---|---|---|
| username | string |
The username used for authentication |
| response | string |
The last response received during authentication steps |
| responseConf | string |
Indicates whether confidentiality was applied or not (GSSAPI only) |
| contextComplete | boolean |
Indicates that authentication has successfully completed or not |
kerberosClient.step(challenge, [callback])
| Param | Type | Description |
|---|---|---|
| challenge | string |
A string containing the base64-encoded server data (which may be empty for the first step) |
| [callback] | function |
Processes a single kerberos client-side step using the supplied server challenge.
Returns: Promise - returns Promise if no callback passed
kerberosClient.wrap(challenge, [options], [callback])
| Param | Type | Description |
|---|---|---|
| challenge | string |
The response returned after calling unwrap |
| [options] | object |
Optional settings |
| [options.user] | string |
The user to authorize |
| [callback] | function |
Perform the client side kerberos wrap step.
Returns: Promise - returns Promise if no callback passed
kerberosClient.unwrap(challenge, [callback])
| Param | Type | Description |
|---|---|---|
| challenge | string |
A string containing the base64-encoded server data |
| [callback] | function |
Perform the client side kerberos unwrap step
Returns: Promise - returns Promise if no callback passed
KerberosServer
Properties
| Name | Type | Description |
|---|---|---|
| username | string |
The username used for authentication |
| response | string |
The last response received during authentication steps |
| targetName | string |
The target used for authentication |
| contextComplete | boolean |
Indicates that authentication has successfully completed or not |
kerberosServer.step(challenge, [callback])
| Param | Type | Description |
|---|---|---|
| challenge | string |
A string containing the base64-encoded client data |
| [callback] | function |
Processes a single kerberos server-side step using the supplied client data.
Returns: Promise - returns Promise if no callback passed
checkPassword(username, password, service, [defaultRealm], [callback])
| Param | Type | Description |
|---|---|---|
| username | string |
The Kerberos user name. If no realm is supplied, then the defaultRealm will be used. |
| password | string |
The password for the user. |
| service | string |
The Kerberos service to check access for. |
| [defaultRealm] | string |
The default realm to use if one is not supplied in the user argument. |
| [callback] | function |
This function provides a simple way to verify that a user name and password match those normally used for Kerberos authentication. It does this by checking that the supplied user name and password can be used to get a ticket for the supplied service. If the user name does not contain a realm, then the default realm supplied is used.
For this to work properly the Kerberos must be configured properly on this machine. That will likely mean ensuring that the edu.mit.Kerberos preference file has the correct realms and KDCs listed.
IMPORTANT: This method is vulnerable to KDC spoofing attacks and it should only be used for testing. Do not use this in any production system - your security could be compromised if you do.
Returns: Promise - returns Promise if no callback passed
principalDetails(service, hostname, [callback])
| Param | Type | Description |
|---|---|---|
| service | string |
The Kerberos service type for the server. |
| hostname | string |
The hostname of the server. |
| [callback] | function |
This function returns the service principal for the server given a service type and hostname.
Details are looked up via the /etc/keytab file.
Returns: Promise - returns Promise if no callback passed
initializeClient(service, [options], [callback])
| Param | Type | Description |
|---|---|---|
| service | string |
A string containing the service principal in the form 'type@fqdn' (e.g. '[email protected]'). |
| [options] | object |
Optional settings |
| [options.principal] | string |
Optional string containing the client principal in the form 'user@realm' (e.g. '[email protected]'). |
| [options.gssFlags] | number |
Optional integer used to set GSS flags. (e.g. GSS_C_DELEG_FLAG |
| [options.mechOID] | number |
Optional GSS mech OID. Defaults to None (GSS_C_NO_OID). Other possible values are GSS_MECH_OID_KRB5, GSS_MECH_OID_SPNEGO. |
| [callback] | function |
Initializes a context for client-side authentication with the given service principal.
Returns: Promise - returns Promise if no callback passed
initializeServer(service, [callback])
| Param | Type | Description |
|---|---|---|
| service | string |
A string containing the service principal in the form 'type@fqdn' (e.g. '[email protected]'). |
| [callback] | function |
Initializes a context for server-side authentication with the given service principal.
Returns: Promise - returns Promise if no callback passed