Add Kerberos specific GSS-API Extensions

Adds some of the Kerberos specific GSS-API extension methods. These
methods are useful when migrating from the Kerberos API to GSS-API or
when needing Kerberos specific functionality that is not exposed in
GSS-API.

Signed-off-by: Jordan Borean <jborean93@gmail.com>

Author: jborean93

README.txt

@@ -161,6 +161,8 @@ In addition to RFC 2743/2744, Python-GSSAPI also has support for:
 
 * GGF Extensions
 
+* Kerberos specific extensions
+
 The Team
 ========
 

docs/source/gssapi.raw.rst

@@ -145,6 +145,13 @@ Acquiring Credentials With a Password Extensions
     :members:
     :undoc-members:
 
+Kerberos Specific Extensions
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. automodule:: gssapi.raw.ext_krb5
+    :members:
+    :undoc-members:
+
 Exceptions
 ----------
 

gssapi/raw/__init__.py

@@ -125,6 +125,12 @@
 except ImportError:
     pass
 
+# optional KRB5 specific extension support
+try:
+    from gssapi.raw.ext_krb5 import *  # noqa
+except ImportError:
+    pass
+
 # optional RFC 6680 support
 try:
     from gssapi.raw.ext_rfc6680 import *  # noqa

gssapi/raw/ext_krb5.pxd

@@ -0,0 +1,2 @@
+cdef class Krb5LucidContext:
+    cdef void *raw_ctx