Implement support for GSSAPI extension gss_inquire_sec_context_by_oid

gssapi/raw/__init__.py

@@ -119,3 +119,9 @@
     from gssapi.raw.ext_rfc6680_comp_oid import *  # noqa
 except ImportError:
     pass
+
+# optional Global Grid Forum
+try:
+    from gssapi.raw.ext_ggf import * # noqa
+except ImportError:
+    pass

gssapi/raw/ext_ggf.pyx

@@ -0,0 +1,47 @@
+GSSAPI="BASE"
+
+from gssapi.raw.cython_types cimport *
+from gssapi.raw.ext_buffer_sets cimport *
+from gssapi.raw.cython_converters cimport c_get_mech_oid_set
+from gssapi.raw.misc import GSSError
+from gssapi.raw.oids cimport OID
+from gssapi.raw.sec_contexts cimport SecurityContext
+
+cdef extern from "python_gssapi_ext.h":
+    OM_uint32 gss_inquire_sec_context_by_oid(OM_uint32 *min_stat,
+                                  const gss_ctx_id_t context_handle,
+                                  const gss_OID desired_object,
+                                  gss_buffer_set_t *data_set) nogil
+
+
+def inquire_sec_context_by_oid(SecurityContext context not None, OID mech not None):
+    """
+    Args:
+      context (SecurityContext): the security context to update, or
+          None to create a new context
+      mech (MechType): the mechanism type for this security context,
+          or None for the default mechanism type
+    """
+    cdef gss_buffer_set_t *output_token_buffer_ptr = NULL
+    cdef gss_buffer_set_t output_token_buffer = GSS_C_NO_BUFFER_SET;
+    cdef OM_uint32 maj_stat, min_stat
+
+    output_token_buffer_ptr = &output_token_buffer
+
+    cdef gss_OID_set desired_mechs
+
+    with nogil:
+        maj_stat = gss_inquire_sec_context_by_oid(&min_stat, context.raw_ctx, &mech.raw_oid, output_token_buffer_ptr)
+
+    if maj_stat == GSS_S_COMPLETE:
+        py_token = []
+
+        if output_token_buffer != GSS_C_NO_BUFFER_SET:
+            for i in range(output_token_buffer.count):
+                token = output_token_buffer.elements[i]
+                py_token.append(token.value[:token.length])
+
+            gss_release_buffer_set(&min_stat, &output_token_buffer)
+            return py_token
+    else:
+        raise GSSError(maj_stat, min_stat)