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gssapi

The gssapi package is a Golang wrapper around RFC 2743, the Generic Security Services Application Programming Interface. (GSSAPI)

Uses

We use it to authenticate clients with our authentication server. Clients talk to a Kerberos or Active Directory Domain Controller to retrieve a Kerberos service ticket, which we verify with a keytab on our authentication server.

When a user logs into Kerberos using kinit, they get a Kerberos TGT. During Kerberos authentication, that TGT is used to retrieve a Service Ticket from the Domain Controller. GSSAPI lets us authenticate without having to know where or in what form the TGT is stored. Because each operating system vendor might move that, this package wraps your system GSSAPI implementation.

What do you use it for? Let us know!

Building

This library is go get compatible. However, it also requires header files to build against the GSSAPI C library on your platform.

Golang needs to be able to find a gcc compiler (and one which is recent enough to support gccgo). If the system compiler isn't gcc, then use CC in environ to point the Golang build tools at your gcc. (LLVM's clang does not work and Golang's diagnostics if it encounters clang are to spew a lot of apparently-unrelated errors from trying to use it anyway).

On MacOS, the default headers are too old; you can use newer headers for building but still use the normal system libraries.

  • FreeBSD: export CC=gcc48; go install
  • MacOS: brew install homebrew/dupes/heimdal --without-x11
  • Ubuntu: see apt-get in test/docker/client/Dockerfile

Testing

Tests in the main gssapi repository can be run using the built-in go test.

To run an integrated test against a live Heimdal Kerberos Domain Controller, cd test and bring up Docker, (or boot2docker). Then, run ./run-heimdal.sh. This will run some go tests using three Docker images: a client, a service, and a domain controller. The service will receive a generated keytab file, and the client will point to the domain controller for authentication.

NOTE: to run Docker tests, your GOROOT environment variable MUST be set.

TODO

See our TODO doc on stuff you can do to help. We welcome contributions!

Verified platforms

We've tested that we can authenticate against:

  • Heimdal Kerberos
  • Active Directory

We suspect we can authenticate against:

  • MIT Kerberos

We definitely cannot authenticate with:

  • Windows clients (because Windows uses SSPI instead of GSSAPI as the library interface)