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[PATCH v2] python: Add Python bindings for libgsasl

From: David Michael
Subject: [PATCH v2] python: Add Python bindings for libgsasl
Date: Mon, 10 Aug 2015 18:33:05 -0400

This change adds a Python module that provides an interface to the
main libgsasl functions.  It is compatible with any Python versions
2.6 or later, including Python 3.

  *  The Pythonic interface to libgsasl is provided by
    this file.  It imports for named numerical constants.

  *  Enumerations found in gsasl.h were converted to the
    Python dictionaries defined in this file.

  *  This file can be run through a Python interpreter to
    verify that all of the functions provided by can be
    called and return successfully.  It needs at least Python 2.7.

Some files are also included to build the module for distribution
with PyPI.  Note that although the module is named "gsasl", the
project name for PyPI is "pygsasl" to avoid naming conflicts with
the main gsasl project's source archives, etc.

  * LICENSE:  This provides the full text of the module's license.

  *  Include the license text in source distributions.

  * README.rst:  A description of the module, its requirements, and
    an example of how to use it are provided by this document.

  * setup.cfg:  Declare that this module should produce universal
    wheels, i.e. it supports both Python 2 and Python 3 natively.

  *  Configure the module installer and its metadata.

These gsasl files were modified to include the above.

  * .gitignore:  Compiled Python files and those created during
    builds with distutils/setuptools are now ignored.

  * lib/  The Python files are appended to EXTRA_DIST
    so they are included in the library's release archives.

Changes since v1:
  - Added a static instead of having the build generate it.
  - Removed the automake build/install of the Python module.
  - Added an independent Python distutils/setuptools build system.
  - Included the module for distribution in the library's Makefile.

(I'm resending this; Emacs printed a GnuTLS error when I tried to send
it, and it doesn't look like it went through.  Sorry if you get multiple
copies of this.)

 .gitignore                   |   6 +
 lib/              |   5 +
 lib/python/LICENSE           | 502 +++++++++++++++++++++++++++++++++++++++++++
 lib/python/       |   1 +
 lib/python/README.rst        |  58 +++++
 lib/python/gsasl/ | 411 +++++++++++++++++++++++++++++++++++
 lib/python/gsasl/     | 132 ++++++++++++
 lib/python/gsasl/    | 200 +++++++++++++++++
 lib/python/setup.cfg         |   2 +
 lib/python/          |  42 ++++
 10 files changed, 1359 insertions(+)
 create mode 100644 lib/python/LICENSE
 create mode 100644 lib/python/
 create mode 100644 lib/python/README.rst
 create mode 100644 lib/python/gsasl/
 create mode 100644 lib/python/gsasl/
 create mode 100644 lib/python/gsasl/
 create mode 100644 lib/python/setup.cfg
 create mode 100644 lib/python/

diff --git a/.gitignore b/.gitignore
index d41560b..48d1d48 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,9 @@
@@ -846,6 +848,10 @@ lib/po/quot.sed
diff --git a/lib/ b/lib/
index 88298d7..792df3e 100644
--- a/lib/
+++ b/lib/
@@ -31,6 +31,11 @@ EXTRA_DIST += win32/libgsasl.sln win32/libgsasl.vcproj       
        win32/include/stdint.h win32/include/unistd.h           \
+# Python module files.
+EXTRA_DIST += python/gsasl/ python/gsasl/    \
+       python/gsasl/ python/ python/setup.cfg  \
+       python/LICENSE python/ python/README.rst
 SUBDIRS = po gl
 # Plugins:
diff --git a/lib/python/LICENSE b/lib/python/LICENSE
new file mode 100644
index 0000000..4362b49
--- /dev/null
+++ b/lib/python/LICENSE
@@ -0,0 +1,502 @@
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diff --git a/lib/python/ b/lib/python/
new file mode 100644
index 0000000..1aba38f
--- /dev/null
+++ b/lib/python/
@@ -0,0 +1 @@
+include LICENSE
diff --git a/lib/python/README.rst b/lib/python/README.rst
new file mode 100644
index 0000000..5721a7d
--- /dev/null
+++ b/lib/python/README.rst
@@ -0,0 +1,58 @@
+GNU SASL Python Bindings
+The `GNU SASL library <>`_ is a portable
+implementation of the Simple Authentication and Security Layer framework and a
+few common SASL mechanisms.  This module provides a Pythonic interface to the
+GNU SASL library to access its functionality in Python applications.
+The GNU SASL Python interface should work on any platform supported by GNU SASL
+itself with Python 2.6 or later, including Python 3.  It requires a valid
+libgsasl installation before the module can be imported.
+If a GNU SASL shared library file is not found by the module, its directory can
+be specified with the environment variable ``LD_LIBRARY_PATH`` on GNU/Linux or
+GNU Hurd distributions, ``DYLD_LIBRARY_PATH`` on Mac OS X, and ``PATH`` on
+The following platforms have commands to install libgsasl globally.
+    ``apt-get install libgsasl7``
+    ``dnf install libgsasl``
+CentOS, RHEL (`EPEL <>`_)
+    ``yum install libgsasl``
+Mac OS X (`Homebrew <>`_)
+    ``brew install gsasl``
+A GSSAPI client can be started quickly like this:
+.. code:: python
+    from gsasl import Gsasl, GsaslError
+    try:
+        client = Gsasl().client_start('GSSAPI')
+    except GsaslError:
+        raise  # Handle potential mechanism support problems.
+    client.property_set_bulk(
+        authzid='username',
+        hostname='',
+        service='service',
+    )
+    try:
+        base64_creds, finished = client.step64()
+    except GsaslError:
+        raise  # Handle potential client property problems.
diff --git a/lib/python/gsasl/ b/lib/python/gsasl/
new file mode 100644
index 0000000..39d0c0f
--- /dev/null
+++ b/lib/python/gsasl/
@@ -0,0 +1,411 @@
+"""Pythonic interface to the gsasl library
+The module provides the following public classes:
+Gsasl(object) -- Initializes a libgsasl context and operates on it
+GsaslSession(object) -- Stores a session context and operates on it
+GsaslClient(GsaslSession) -- Initializes a client session context
+GsaslServer(GsaslSession) -- Initializes a server session context
+GsaslError(Exception) -- Raised when libgsasl functions return errors
+The module provides the following public functions:
+check_version -- Tests if the library is at least as new as requested
+saslprep -- Prepare a string (stringprep) with the SASLprep profile
+The module provides the following submodule:
+enum -- Exports dictionaries of named numerical constants
+Most of libgsasl's functionality is available through the above classes
+and functions, but the following library functions were omitted:
+  * gsasl_base64_from, gsasl_base64_to
+        Use the base64 module for this functionality.
+  * gsasl_hmac_md5, gsasl_hmac_sha1, gsasl_md5, gsasl_sha1
+        Use the hashlib and hmac modules for this functionality.
+  * gsasl_nonce, gsasl_random
+        Use the random module for this functionality.
+  * gsasl_simple_getpass
+        Use "if line.startswith(username + '\t')" in a file loop.
+  * gsasl_callback, gsasl_callback_set,
+    gsasl_callback_hook_get, gsasl_callback_hook_set,
+    gsasl_session_hook_get, gsasl_session_hook_set
+        Application callbacks are not implemented yet.
+The module provides the following functions that are not used in normal
+operation, but they can access the unexported libgsasl functions:
+get_library_handle -- Returns a CDLL object for libgsasl
+pythonize_memory -- Converts a C memory pointer to a Python string
+from ctypes import CDLL, byref, c_char_p, c_int, create_string_buffer, memmove
+from ctypes.util import find_library
+from gsasl import enum
+# Utility Functions
+def _b2s(data):
+    """Convert bytes to str for Python 3 ctypes compatibility."""
+    if data is not None and not isinstance(data, str):
+        return data.decode('utf-8')
+    return data
+def _s2b(string):
+    """Convert str to bytes for Python 3 ctypes compatibility."""
+    if string is not None and not isinstance(string, bytes):
+        return string.encode('utf-8')
+    return string
+def _s2p(string):
+    """Convert str to c_char_p for compatibility and convenience."""
+    if string is not None and not isinstance(string, bytes):
+        return c_char_p(string.encode('utf-8'))
+    return c_char_p(string)
+def get_library_handle():
+    """Return a CDLL object providing the raw interface to libgsasl.
+    Many of the library functions' return types are also specified here
+    before returning the CDLL object.  They are configured to either
+    raise an exception on non-zero return codes or to return a string
+    instead of constant character pointers.
+    """
+    def cb_errcheck_ok(result, func, arguments):
+        """Raise a GsaslError on non-zero return codes from libgsasl."""
+        if result != enum.rc.OK:
+            raise GsaslError(result)
+        return result
+    # Get a libgsasl handle, either a UNIX SO or a Windows DLL.
+    name = find_library('gsasl') or find_library('libgsasl-7') or ''
+    libgsasl = CDLL(name)
+    # Prepare functions that should always return GSASL_OK.
+    libgsasl.gsasl_base64_from.errcheck = cb_errcheck_ok
+    libgsasl.gsasl_base64_to.errcheck = cb_errcheck_ok
+    libgsasl.gsasl_client_mechlist.errcheck = cb_errcheck_ok
+    libgsasl.gsasl_client_start.errcheck = cb_errcheck_ok
+    libgsasl.gsasl_decode.errcheck = cb_errcheck_ok
+    libgsasl.gsasl_encode.errcheck = cb_errcheck_ok
+    libgsasl.gsasl_hmac_md5.errcheck = cb_errcheck_ok
+    libgsasl.gsasl_hmac_sha1.errcheck = cb_errcheck_ok
+    libgsasl.gsasl_init.errcheck = cb_errcheck_ok
+    libgsasl.gsasl_md5.errcheck = cb_errcheck_ok
+    libgsasl.gsasl_nonce.errcheck = cb_errcheck_ok
+    libgsasl.gsasl_random.errcheck = cb_errcheck_ok
+    libgsasl.gsasl_saslprep.errcheck = cb_errcheck_ok
+    libgsasl.gsasl_server_mechlist.errcheck = cb_errcheck_ok
+    libgsasl.gsasl_server_start.errcheck = cb_errcheck_ok
+    libgsasl.gsasl_sha1.errcheck = cb_errcheck_ok
+    libgsasl.gsasl_simple_getpass.errcheck = cb_errcheck_ok
+    # Prepare functions that return an internally managed string.
+    libgsasl.gsasl_check_version.restype = c_char_p
+    libgsasl.gsasl_client_suggest_mechanism.restype = c_char_p
+    libgsasl.gsasl_mechanism_name.restype = c_char_p
+    libgsasl.gsasl_property_fast.restype = c_char_p
+    libgsasl.gsasl_property_get.restype = c_char_p
+    libgsasl.gsasl_strerror.restype = c_char_p
+    libgsasl.gsasl_strerror_name.restype = c_char_p
+    return libgsasl
+def pythonize_memory(pointer, length=None):
+    """Convert data at a pointer to a Python string and free its memory.
+    For binary data, this method should be given a c_char_p pointing at
+    the data and its length in bytes as arguments.
+    For plain (NUL-terminated) text, the length argument can be omitted.
+    """
+    if pointer is None or pointer.value is None:
+        return None
+    if length is None:
+        length = len(pointer.value)  # Don't copy the trailing NUL for text.
+    string_buffer = create_string_buffer(length)
+    memmove(string_buffer, pointer, length)
+    _lib.gsasl_free(pointer)
+    return string_buffer.raw
+# Pythonic Library Interface
+class GsaslError(Exception):
+    """Create an exception using error codes from libgsasl functions."""
+    def __init__(self, err):
+        """Initialize an error message generated from a return code.
+        The specific error code is saved as the "err" attribute, which
+        can be used in "except" blocks to handle known problems.
+        """
+        self.err = err
+        message = _b2s(_lib.gsasl_strerror(err))
+        name = _b2s(_lib.gsasl_strerror_name(err))
+        if name is not None:
+            message = '%s: %s' % (name, message)
+        super(GsaslError, self).__init__(message)
+class GsaslSession(object):
+    """Create an object that stores and operates on a session context.
+    This class should not be initialized directly.  Instead, see the
+    GsaslClient and GsaslServer subclasses which provide the session
+    context.  Any users that don't care about client vs server contexts
+    can do type checking with this class, while others can test with
+    GsaslClient and GsaslServer.
+    """
+    def __init__(self, gsasl, sctx):
+        """Initialize a session object by storing a context pointer.
+        The session context itself should be initialized by the calling
+        function.  That allows this class to remain unaware of the type
+        of session it's using.
+        A reference to the Gsasl object that initialized the session
+        context is also stored here so that it does not fall victim to
+        garbage collection while the session is still active.
+        """
+        self.gsasl = gsasl
+        self.sctx = sctx
+    def __del__(self):
+        """Destroy the session context."""
+        _lib.gsasl_finish(self.sctx)
+    @property
+    def mechanism_name(self):
+        """Return the name of the mechanism used by this session."""
+        return _b2s(_lib.gsasl_mechanism_name(self.sctx))
+    def decode(self, data):
+        """Decode the given data using the session's parameters.
+        The returned value is a byte string to support binary data.
+        """
+        input_bytes = _s2b(data)
+        input_len = 0 if input_bytes is None else len(input_bytes)
+        output = c_char_p()
+        output_len = c_int(0)
+        _lib.gsasl_decode(self.sctx,
+                          c_char_p(input_bytes), input_len,
+                          byref(output), byref(output_len))
+        return pythonize_memory(output, output_len.value)
+    def encode(self, data):
+        """Encode the given data using the session's parameters.
+        The returned value is a byte string to support binary data.
+        """
+        input_bytes = _s2b(data)
+        input_len = 0 if input_bytes is None else len(input_bytes)
+        output = c_char_p()
+        output_len = c_int(0)
+        _lib.gsasl_encode(self.sctx,
+                          c_char_p(input_bytes), input_len,
+                          byref(output), byref(output_len))
+        return pythonize_memory(output, output_len.value)
+    def property_fast(self, prop):
+        """Return the value of the given property, skipping callbacks.
+        If the given property is not a numerical value, assume it is a
+        key to look up the numerical value in
+        The returned data is a byte string to support binary data.
+        """
+        if not isinstance(prop, int):
+            prop =[prop.upper()]
+        return _lib.gsasl_property_fast(self.sctx, prop)
+    def property_get(self, prop):
+        """Return the value of the given property.
+        If the given property is not a numerical value, assume it is a
+        key to look up the numerical value in
+        The returned data is a byte string to support binary data.
+        """
+        if not isinstance(prop, int):
+            prop =[prop.upper()]
+        return _lib.gsasl_property_get(self.sctx, prop)
+    def property_set(self, prop, data):
+        """Store the given data as the value of the given property.
+        If the given property is not a numerical value, assume it is a
+        key to look up the numerical value in
+        The actual library function used here is gsasl_property_set_raw
+        so that binary data in a Python string can be stored correctly.
+        """
+        if not isinstance(prop, int):
+            prop =[prop.upper()]
+        bdata = _s2b(data)
+        length = 0 if bdata is None else len(bdata)
+        _lib.gsasl_property_set_raw(self.sctx, prop, c_char_p(bdata), length)
+    def property_set_bulk(self, **kwargs):
+        """Given "key=value" arguments, set property "key" to "value".
+        For readability, property keys will be converted to uppercase.
+        """
+        for key, value in kwargs.items():
+            self.property_set(key, value)
+    def step(self, data=None):
+        """Return a step of SASL authentication output.
+        A tuple of the output data and a boolean are returned.  The
+        output data will be a byte string since it can be binary.  The
+        boolean will be True if authentication ended successfully, or it
+        will be False if more data is required.
+        """
+        input_bytes = _s2b(data)
+        input_len = 0 if input_bytes is None else len(input_bytes)
+        output = c_char_p()
+        output_len = c_int(0)
+        err = _lib.gsasl_step(self.sctx,
+                              c_char_p(input_bytes), input_len,
+                              byref(output), byref(output_len))
+        if err not in (enum.rc.OK, enum.rc.NEEDS_MORE):
+            raise GsaslError(err)
+        return pythonize_memory(output, output_len.value), err == enum.rc.OK
+    def step64(self, data=None):
+        """Given base64-encoded input, return encoded step output.
+        A tuple of the output data and a boolean are returned.  The
+        output data will be a string of the base64-encoded results.  The
+        boolean will be True if authentication ended successfully, or it
+        will be False if more data is required.
+        """
+        output = c_char_p()
+        err = _lib.gsasl_step64(self.sctx, _s2p(data), byref(output))
+        if err not in (enum.rc.OK, enum.rc.NEEDS_MORE):
+            raise GsaslError(err)
+        return _b2s(pythonize_memory(output)), err == enum.rc.OK
+class GsaslClient(GsaslSession):
+    """Create a GsaslSession with a client session context."""
+    def __init__(self, gsasl, mechanism):
+        """Initialize a new client context using the given mechanism."""
+        super(GsaslClient, self).__init__(gsasl, c_char_p())
+        _lib.gsasl_client_start(gsasl.ctx, _s2p(mechanism), byref(self.sctx))
+class GsaslServer(GsaslSession):
+    """Create a GsaslSession with a server session context."""
+    def __init__(self, gsasl, mechanism):
+        """Initialize a new server context using the given mechanism."""
+        super(GsaslServer, self).__init__(gsasl, c_char_p())
+        _lib.gsasl_server_start(gsasl.ctx, _s2p(mechanism), byref(self.sctx))
+class Gsasl(object):
+    """Create and operate on a libgsasl library context.
+    Instances of this class can be used to determine supported mechanism
+    names and spawn client and server sessions.
+    """
+    def __init__(self):
+        """Initialize and save a new library context pointer."""
+        self.ctx = c_char_p()
+        _lib.gsasl_init(byref(self.ctx))
+    def __del__(self):
+        """Destroy the library context."""
+        _lib.gsasl_done(self.ctx)
+    @property
+    def client_mechlist(self):
+        """Return a list of mechanisms available to client sessions."""
+        output = c_char_p()
+        _lib.gsasl_client_mechlist(self.ctx, byref(output))
+        return _b2s(pythonize_memory(output)).split()
+    @property
+    def server_mechlist(self):
+        """Return a list of mechanisms available to server sessions."""
+        output = c_char_p()
+        _lib.gsasl_server_mechlist(self.ctx, byref(output))
+        return _b2s(pythonize_memory(output)).split()
+    def client_suggest_mechanism(self, mechs=None):
+        """Return a suggested mechanism name that the client supports.
+        If a list (or space-separated string) of mechanism names is
+        given as an argument, the name returned will be a name that is
+        both in the list and supported by the client, or None if no such
+        mechanism exists.
+        """
+        if mechs is None:
+            mechs = self.client_mechlist
+        if hasattr(mechs, '__iter__') and not isinstance(mechs, (str, bytes)):
+            mechs = ' '.join(mechs)
+        return _b2s(_lib.gsasl_client_suggest_mechanism(self.ctx, _s2p(mechs)))
+    def client_start(self, mechanism):
+        """Return a new client session using the given mechanism."""
+        return GsaslClient(self, mechanism)
+    def client_support(self, mechanism):
+        """Return whether the client supports the given mechanism."""
+        return _lib.gsasl_client_support_p(self.ctx, _s2p(mechanism)) != 0
+    def server_start(self, mechanism):
+        """Return a new server session using the given mechanism."""
+        return GsaslServer(self, mechanism)
+    def server_support(self, mechanism):
+        """Return whether the server supports the given mechanism."""
+        return _lib.gsasl_server_support_p(self.ctx, _s2p(mechanism)) != 0
+def check_version(version=None):
+    """Test the libgsasl version against the given version number.
+    Return the library version if it is at least as new as the given
+    value, or return None otherwise.  If the version argument is None,
+    the library version is always returned.
+    """
+    return _b2s(_lib.gsasl_check_version(_s2p(version)))
+def saslprep(string, flags=0, **kwargs):
+    """Run the given string through the stringprep's SASLprep profile.
+    Values from enum.saslprep_flags can be passed as the flags argument.
+    Alternatively, names from enum.saslprep_flags can be supplied like
+    "name=True" or "name=False" to set or unset the flags, respectively.
+    """
+    if string is None:
+        return None  # Avoid passing NULL, otherwise saslprep segfaults.
+    for key, value in kwargs.items():
+        flag = enum.saslprep_flags[key.upper()]
+        flags = flags | flag if value else flags & ~flag
+    output = c_char_p()
+    prep_rc = c_int(0)  # This is currently unused after being set.
+    _lib.gsasl_saslprep(_s2p(string), flags, byref(output), byref(prep_rc))
+    return _b2s(pythonize_memory(output))
+_lib = get_library_handle()
diff --git a/lib/python/gsasl/ b/lib/python/gsasl/
new file mode 100644
index 0000000..7726a5e
--- /dev/null
+++ b/lib/python/gsasl/
@@ -0,0 +1,132 @@
+"""Named numerical constants used by the gsasl library
+The module provides the following public class, which should not need to
+be accessed directly in normal operation:
+GsaslEnum(dict) -- Accesses dictionary items through attributes
+The following public dictionaries are instances of the above class:
+rc -- Return codes from libgsasl functions
+qop -- Quality of protection types for DIGEST-MD5 and GSSAPI
+cipher -- Encryption types for DIGEST-MD5
+saslprep_flags -- Modifiers for the saslprep function
+property -- Session property types
+class GsaslEnum(dict):
+    """Allow dictionary item access as attributes for code readability.
+    This permits Python code such as "if err == enum.rc.OK:" which has
+    enumeration expressions more recognizable as constants, but keeping
+    the values in dictionaries also preserves easy discoverability with
+    code such as "for property_name in".
+    In other words, this is a rudimentary alternative to the Python 3
+    class enum.IntEnum for use with older versions of Python.
+    """
+    __getattr__ = dict.get
+rc = GsaslEnum({
+    'OK': 0,
+    'NEEDS_MORE': 1,
+    'MALLOC_ERROR': 7,
+    'BASE64_ERROR': 8,
+    'CRYPTO_ERROR': 9,
+    'SASLPREP_ERROR': 29,
+    'NO_CLIENT_CODE': 35,
+    'NO_SERVER_CODE': 36,
+    'NO_CALLBACK': 51,
+    'NO_AUTHID': 53,
+    'NO_AUTHZID': 54,
+    'NO_PASSWORD': 55,
+    'NO_PASSCODE': 56,
+    'NO_PIN': 57,
+    'NO_SERVICE': 58,
+    'NO_HOSTNAME': 59,
+    'NO_CB_TLS_UNIQUE': 65,
+    'NO_SAML20_REDIRECT_URL': 67,
+    'SHISHI_ERROR': 47,
+qop = GsaslEnum({
+    'QOP_AUTH': 1,
+    'QOP_AUTH_INT': 2,
+    'QOP_AUTH_CONF': 4,
+cipher = GsaslEnum({
+    'CIPHER_DES': 1,
+    'CIPHER_3DES': 2,
+    'CIPHER_RC4': 4,
+    'CIPHER_RC4_40': 8,
+    'CIPHER_RC4_56': 16,
+    'CIPHER_AES': 32,
+saslprep_flags = GsaslEnum({
+property = GsaslEnum({
+    'AUTHID': 1,
+    'AUTHZID': 2,
+    'PASSWORD': 3,
+    'SERVICE': 5,
+    'HOSTNAME': 6,
+    'PASSCODE': 8,
+    'SUGGESTED_PIN': 9,
+    'PIN': 10,
+    'REALM': 11,
+    'QOPS': 13,
+    'QOP': 14,
+    'SCRAM_ITER': 15,
+    'SCRAM_SALT': 16,
+    'CB_TLS_UNIQUE': 18,
+    'SAML20_REDIRECT_URL': 20,
+    'VALIDATE_SIMPLE': 500,
+    'VALIDATE_GSSAPI': 503,
+    'VALIDATE_SAML20': 505,
+    'VALIDATE_OPENID20': 506,
diff --git a/lib/python/gsasl/ b/lib/python/gsasl/
new file mode 100644
index 0000000..5807801
--- /dev/null
+++ b/lib/python/gsasl/
@@ -0,0 +1,200 @@
+"""Tests for the gsasl Python interface
+This file provides the following public classes:
+BaseGsaslTestCase(TestCase) -- Tests check_version and saslprep
+GsaslTestCase(TestCase) -- Tests Gsasl
+GsaslClientTestCase(TestCase) -- Tests GsaslClient
+GsaslServerTestCase(GsaslClientTestCase) -- Tests GsaslServer
+The tests defined by these classes are intended to verify only that the
+Python interface successfully returns correct data types and doesn't
+cause the interpreter to crash.  It is expected that the actual libgsasl
+functionality and standards conformance have been tested separately.
+from unittest import TestCase, main
+from gsasl import Gsasl, GsaslError, GsaslClient, GsaslServer
+from gsasl import check_version, saslprep
+# Choose a supported mechanism name to test against.
+class BaseGsaslTestCase(TestCase):
+    """Test standalone functions."""
+    def test_check_version(self):
+        """Test passing older, newer, and no version strings."""
+        version = check_version()
+        self.assertIsInstance(version, str)
+        self.assertEqual(check_version('0'), version)
+        self.assertIsNone(check_version('999'))
+    def test_saslprep(self):
+        """Test that ASCII characters are unchanged.
+        Assume libidn was already tested for the real functionality used
+        here, since if gsasl was built without libidn, saslprep will
+        raise an error on a non-ASCII character.
+        """
+        self.assertEqual(saslprep('abc'), 'abc')
+        self.assertIsNone(saslprep(None))
+class GsaslTestCase(TestCase):
+    """Test functions that rely on an initialized library context."""
+    def setUp(self):
+        """Set up a library context."""
+        self.gsasl = Gsasl()
+    def tearDown(self):
+        """Destroy the library context."""
+        del self.gsasl
+    def test_client_mechlist(self):
+        """Test that the client has a list of mechanisms."""
+        mechlist = self.gsasl.client_mechlist
+        self.assertIsInstance(mechlist, list)
+        self.assertIn(MECH, mechlist)
+    def test_client_start(self):
+        """Test that a client can be started."""
+        client = self.gsasl.client_start(MECH)
+        self.assertIsInstance(client, GsaslClient)
+        self.assertEqual(client.gsasl, self.gsasl)
+        self.assertRaises(GsaslError, lambda: self.gsasl.client_start(None))
+        self.assertRaises(GsaslError, lambda: self.gsasl.client_start(''))
+    def test_client_suggest_mechanism(self):
+        """Test that mechanisms are suggested from lists and strings."""
+        self.assertIsInstance(self.gsasl.client_suggest_mechanism(), str)
+        self.assertEqual(self.gsasl.client_suggest_mechanism(['X', MECH]),
+                         MECH)
+        self.assertEqual(self.gsasl.client_suggest_mechanism('X %s Y' % MECH),
+                         MECH)
+        self.assertEqual(self.gsasl.client_suggest_mechanism(MECH), MECH)
+        self.assertIsNone(self.gsasl.client_suggest_mechanism(['X', 'Y', 'Z']))
+        self.assertIsNone(self.gsasl.client_suggest_mechanism('X Y Z'))
+        self.assertIsNone(self.gsasl.client_suggest_mechanism(' '))
+        self.assertIsNone(self.gsasl.client_suggest_mechanism(''))
+    def test_client_support(self):
+        """Test that the client supports a mechanism."""
+        self.assertTrue(self.gsasl.client_support(MECH))
+        self.assertFalse(self.gsasl.client_support(None))
+        self.assertFalse(self.gsasl.client_support('NONSENSE'))
+        self.assertFalse(self.gsasl.client_support(' '))
+        self.assertFalse(self.gsasl.client_support(''))
+    def test_server_mechlist(self):
+        """Test that the server has a list of mechanisms."""
+        mechlist = self.gsasl.client_mechlist
+        self.assertIsInstance(mechlist, list)
+        self.assertIn(MECH, mechlist)
+    def test_server_start(self):
+        """Test that a server can be started."""
+        server = self.gsasl.server_start(MECH)
+        self.assertIsInstance(server, GsaslServer)
+        self.assertEqual(server.gsasl, self.gsasl)
+        self.assertRaises(GsaslError, lambda: self.gsasl.server_start(None))
+        self.assertRaises(GsaslError, lambda: self.gsasl.server_start(''))
+    def test_server_support(self):
+        """Test that the server supports a mechanism."""
+        self.assertTrue(self.gsasl.server_support(MECH))
+        self.assertFalse(self.gsasl.server_support(None))
+        self.assertFalse(self.gsasl.server_support('NONSENSE'))
+        self.assertFalse(self.gsasl.server_support(' '))
+        self.assertFalse(self.gsasl.server_support(''))
+class GsaslClientTestCase(TestCase):
+    """Test functions that rely on an initialized client context."""
+    def setUp(self):
+        """Set up a client session context."""
+        self.session = Gsasl().client_start(MECH)
+    def tearDown(self):
+        """Destroy the session context."""
+        del self.session
+    def test_encode(self):
+        """Test PLAIN encoding."""
+        self.assertEqual(self.session.encode('text'), b'text')
+        self.assertEqual(self.session.encode(None), b'')
+    def test_decode(self):
+        """Test PLAIN decoding."""
+        self.assertEqual(self.session.decode('text'), b'text')
+        self.assertEqual(self.session.decode(None), b'')
+    def test_mechanism_name(self):
+        """Test that the mechanism name matches the constructor."""
+        self.assertEqual(self.session.mechanism_name, MECH)
+    def test_properties(self):
+        """Test setting and getting session properties."""
+        self.assertIsNone(self.session.property_fast('AUTHID'))
+        self.assertIsNone(self.session.property_get('AUTHID'))
+        self.session.property_set('AUTHID', 'user1')
+        self.assertEqual(self.session.property_fast('AUTHID'), b'user1')
+        self.assertEqual(self.session.property_get('AUTHID'), b'user1')
+        self.session.property_set_bulk(authid='user2', authzid='user3')
+        self.assertEqual(self.session.property_fast('AUTHID'), b'user2')
+        self.assertEqual(self.session.property_get('AUTHID'), b'user2')
+        self.assertEqual(self.session.property_fast('AUTHZID'), b'user3')
+        self.assertEqual(self.session.property_get('AUTHZID'), b'user3')
+        self.session.property_set('AUTHID', None)
+        self.assertIsNone(self.session.property_fast('AUTHID'))
+        self.assertIsNone(self.session.property_get('AUTHID'))
+    def test_step(self):
+        """Test a PLAIN client step."""
+        username = 'username'
+        password = 'password'
+        expect = ('\0%s\0%s' % (username, password)).encode('ascii')
+        self.session.property_set_bulk(authid=username, password=password)
+        output, finished = self.session.step()
+        self.assertTrue(finished)
+        self.assertEqual(output, expect)
+    def test_step64(self):
+        """Test a base64-encoded PLAIN client step."""
+        from base64 import b64encode
+        username = 'username'
+        password = 'password'
+        expect = ('\0%s\0%s' % (username, password)).encode('ascii')
+        self.session.property_set_bulk(authid=username, password=password)
+        output, finished = self.session.step64()
+        self.assertTrue(finished)
+        self.assertEqual(output, b64encode(expect).decode('ascii'))
+class GsaslServerTestCase(GsaslClientTestCase):
+    """Test functions that rely on an initialized server context."""
+    def setUp(self):
+        """Set up a server session context."""
+        self.session = Gsasl().server_start(MECH)
+    def test_step(self):
+        """Test a PLAIN server step."""
+        output, finished = self.session.step()
+        self.assertFalse(finished)
+        self.assertIsNone(output)
+    def test_step64(self):
+        """Test a base64-encoded PLAIN server step."""
+        output, finished = self.session.step64()
+        self.assertFalse(finished)
+        self.assertEqual(output, '')
+if __name__ == '__main__':
+    main()
diff --git a/lib/python/setup.cfg b/lib/python/setup.cfg
new file mode 100644
index 0000000..3c6e79c
--- /dev/null
+++ b/lib/python/setup.cfg
@@ -0,0 +1,2 @@
diff --git a/lib/python/ b/lib/python/
new file mode 100644
index 0000000..2e7e6a5
--- /dev/null
+++ b/lib/python/
@@ -0,0 +1,42 @@
+"""Set up package configuration for the gsasl Python bindings"""
+    from setuptools import setup  # Try setuptools first for bdist_wheel.
+except ImportError:
+    from distutils.core import setup
+from os import path
+with open(path.join(path.dirname(__file__), 'README.rst')) as readme_file:
+    README =
+    author='David Michael',
+    author_email='address@hidden',
+    classifiers=[
+        'Development Status :: 3 - Alpha',
+        'Intended Audience :: Information Technology',
+        ('License :: OSI Approved :: '
+         'GNU Lesser General Public License v2 or later (LGPLv2+)'),
+        'Operating System :: OS Independent',
+        'Programming Language :: Python :: 2',
+        'Programming Language :: Python :: 2.6',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.2',
+        'Programming Language :: Python :: 3.3',
+        'Programming Language :: Python :: 3.4',
+        'Topic :: Security :: Cryptography',
+    ],
+    description='Python bindings for the GNU SASL library',
+    keywords=['gnu', 'sasl', 'gssapi', 'kerberos'],
+    license='LGPLv2+',
+    long_description=README,
+    maintainer='GNU SASL Maintainers',
+    maintainer_email='address@hidden',
+    name='pygsasl',
+    packages=['gsasl'],
+    platforms=['OS Independent'],
+    url='',
+    version='1.8.0',

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