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Andrey Kislyuk 2017-08-21 17:02:39 -07:00
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# Reminder:
# - A leading slash means the pattern is anchored at the root.
# - No leading slash means the pattern matches at any depth.
# Python files
*.pyc
__pycache__/
.tox/
*.egg-info/
/build/
/dist/
/.eggs/
# Sphinx documentation
/docs/_build/
# IDE project files
/.pydevproject
# vim python-mode plugin
/.ropeproject
# IntelliJ IDEA / PyCharm project files
/.idea
/*.iml
# JS/node/npm/web dev files
node_modules
npm-debug.log
# OS X metadata files
.DS_Store
# Python coverage
.coverage

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language: python
python:
- 2.7
- 3.3
- 3.4
- 3.5
- 3.6
- nightly
dist: trusty
sudo: false
before_install:
- pip install --quiet codecov wheel
install:
- make install
script:
- make test
after_success:
- bash <(curl -s https://codecov.io/bash)

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test_deps:
pip install coverage flake8 wheel
lint: test_deps
./setup.py flake8
test: test_deps lint
coverage run --source=$$(python setup.py --name) ./test/test.py
init_docs:
cd docs; sphinx-quickstart
docs:
$(MAKE) -C docs html
install: clean
pip install wheel
python setup.py bdist_wheel
pip install --upgrade dist/*.whl
clean:
-rm -rf build dist
-rm -rf *.egg-info
.PHONY: lint test test_deps docs install clean
include common.mk

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requests-http-signature: A Requests auth module for HTTP Signature
==================================================================
**requests-http-signature** is a `Requests <https://github.com/requests/requests>`_ `authentication plugin
<http://docs.python-requests.org/en/master/user/authentication/>`_ (``requests.auth.AuthBase`` subclass) implementing
the `IETF HTTP Signatures draft <https://tools.ietf.org/html/draft-cavage-http-signatures>`_. It has no dependencies
outside the standard library.
.. code-block:: python
import requests
from requests_http_signature import HTTPSignatureAuth
preshared_secret = 'monorail_cat'
url = 'http://httpbin.org/get'
requests.get(url, auth=HTTPSignatureAuth(secret=preshared_secret))
Installation
------------
::
pip install requests-http-signature
Links
-----
* `IETF HTTP Signatures draft <https://tools.ietf.org/html/draft-cavage-http-signatures>`_
* `Project home page (GitHub) <https://github.com/kislyuk/requests-http-signature>`_
* `Documentation (Read the Docs) <https://requests-http-signature.readthedocs.io/en/latest/>`_
* `Package distribution (PyPI) <https://pypi.python.org/pypi/requests-http-signature>`_
* `Change log <https://github.com/kislyuk/requests-http-signature/blob/master/Changes.rst>`_
Bugs
~~~~
Please report bugs, issues, feature requests, etc. on `GitHub <https://github.com/kislyuk/requests-http-signature/issues>`_.
License
-------
Licensed under the terms of the `Apache License, Version 2.0 <http://www.apache.org/licenses/LICENSE-2.0>`_.
.. image:: https://travis-ci.org/kislyuk/requests-http-signature.png
:target: https://travis-ci.org/kislyuk/requests-http-signature
.. image:: https://codecov.io/github/kislyuk/requests-http-signature/coverage.svg?branch=master
:target: https://codecov.io/github/kislyuk/requests-http-signature?branch=master
.. image:: https://img.shields.io/pypi/v/requests-http-signature.svg
:target: https://pypi.python.org/pypi/requests-http-signature
.. image:: https://img.shields.io/pypi/l/requests-http-signature.svg
:target: https://pypi.python.org/pypi/requests-http-signature
.. image:: https://readthedocs.org/projects/requests-http-signature/badge/?version=latest
:target: https://requests-http-signature.readthedocs.org/

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SHELL=/bin/bash -eo pipefail
release_major:
$(eval export TAG=$(shell git describe --tags --match 'v*.*.*' | perl -ne '/^v(\d)+\.(\d)+\.(\d+)+/; print "v@{[$$1+1]}.0.0"'))
$(MAKE) release
release_minor:
$(eval export TAG=$(shell git describe --tags --match 'v*.*.*' | perl -ne '/^v(\d)+\.(\d)+\.(\d+)+/; print "v$$1.@{[$$2+1]}.0"'))
$(MAKE) release
release_patch:
$(eval export TAG=$(shell git describe --tags --match 'v*.*.*' | perl -ne '/^v(\d)+\.(\d)+\.(\d+)+/; print "v$$1.$$2.@{[$$3+1]}"'))
$(MAKE) release
release:
@if [[ -z $$TAG ]]; then echo "Use release_{major,minor,patch}"; exit 1; fi
$(eval REMOTE=$(shell git remote get-url origin | perl -ne '/([^\/\:]+\/.+?)(\.git)?$$/; print $$1'))
$(eval GIT_USER=$(shell git config --get user.email))
$(eval GH_AUTH=$(shell if grep -q '@github.com' ~/.git-credentials; then echo $$(grep '@github.com' ~/.git-credentials | python3 -c 'import sys, urllib.parse as p; print(p.urlparse(sys.stdin.read()).netloc.split("@")[0])'); else echo $(GIT_USER); fi))
$(eval RELEASES_API=https://api.github.com/repos/${REMOTE}/releases)
$(eval UPLOADS_API=https://uploads.github.com/repos/${REMOTE}/releases)
git pull
git clean -x --force $$(python setup.py --name)
sed -i -e "s/version=\([\'\"]\)[0-9]*\.[0-9]*\.[0-9]*/version=\1$${TAG:1}/" setup.py
git add setup.py
TAG_MSG=$$(mktemp); \
echo "# Changes for ${TAG} ($$(date +%Y-%m-%d))" > $$TAG_MSG; \
git log --pretty=format:%s $$(git describe --abbrev=0)..HEAD >> $$TAG_MSG; \
$${EDITOR:-emacs} $$TAG_MSG; \
if [[ -f Changes.md ]]; then cat $$TAG_MSG <(echo) Changes.md | sponge Changes.md; git add Changes.md; fi; \
if [[ -f Changes.rst ]]; then cat <(pandoc --from markdown --to rst $$TAG_MSG) <(echo) Changes.rst | sponge Changes.rst; git add Changes.rst; fi; \
git commit -m ${TAG}; \
git tag --sign --annotate --file $$TAG_MSG ${TAG}
git push --follow-tags
http --auth ${GH_AUTH} ${RELEASES_API} tag_name=${TAG} name=${TAG} \
body="$$(git tag --list ${TAG} -n99 | perl -pe 's/^\S+\s*// if $$. == 1' | sed 's/^\s\s\s\s//')"
$(MAKE) install
http --auth ${GH_AUTH} POST ${UPLOADS_API}/$$(http --auth ${GH_AUTH} ${RELEASES_API}/latest | jq .id)/assets \
name==$$(basename dist/*.whl) label=="Python Wheel" < dist/*.whl
$(MAKE) pypi_release
pypi_release:
python setup.py sdist bdist_wheel upload --sign
.PHONY: release

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from __future__ import absolute_import, division, print_function, unicode_literals
import base64, hashlib, hmac, time
import email.utils
import requests
from requests.compat import urlparse
class Crypto:
def __init__(self, algorithm):
if algorithm != "hmac-sha256":
from cryptography.hazmat.primitives.serialization import load_pem_private_key, load_pem_public_key
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.asymmetric import rsa, ec
from cryptography.hazmat.primitives.asymmetric.padding import PKCS1v15
from cryptography.hazmat.primitives.hashes import SHA1, SHA256
self.__dict__.update(locals())
def sign(self, string_to_sign, key, passphrase=None):
if self.algorithm == "hmac-sha256":
return hmac.new(key, string_to_sign, digestmod=hashlib.sha256).digest()
key = self.load_pem_private_key(key, password=passphrase, backend=self.default_backend())
if self.algorithm in {"rsa-sha1", "rsa-sha256"}:
hasher = self.SHA1() if self.algorithm.endswith("sha1") else self.SHA256()
signer = key.signer(padding=self.PKCS1v15(), algorithm=hasher)
elif self.algorithm == "ecdsa-sha256":
signer = key.signer(signature_algorithm=self.ec.ECDSA(algorithm=self.SHA256()))
signer.update(string_to_sign)
return signer.finalize()
def verify(self, signature, string_to_sign, key):
if self.algorithm == "hmac-sha256":
assert signature == hmac.new(key, string_to_sign, digestmod=hashlib.sha256).digest()
else:
key = self.load_pem_public_key(key, backend=self.default_backend())
key.verify(signature, string_to_sign, self.PKCS1v15(), self.SHA256())
class HTTPSignatureAuth(requests.auth.AuthBase):
hasher_constructor = hashlib.sha256
known_algorithms = {
"rsa-sha1",
"rsa-sha256",
"hmac-sha256",
"ecdsa-sha256",
}
def __init__(self, key, key_id="hmac-key-1", algorithm="hmac-sha256", headers=None, passphrase=None):
assert algorithm in self.known_algorithms
self.key = key
self.key_id = key_id
self.algorithm = algorithm
self.headers = [h.lower() for h in headers] if headers is not None else ["date"]
self.passphrase = passphrase
def add_date(self, request, timestamp=None):
if "Date" not in request.headers:
if timestamp is None:
timestamp = time.time()
request.headers["Date"] = email.utils.formatdate(timestamp, usegmt=True)
def add_digest(self, request):
if request.body is not None and "Digest" not in request.headers:
if "digest" not in self.headers:
self.headers.append("digest")
digest = self.hasher_constructor(request.body).digest()
request.headers["Digest"] = "SHA-256=" + base64.b64encode(digest).decode()
def get_string_to_sign(self, request, headers):
sts = []
for header in headers:
if header == "(request-target)":
sts.append("(request-target): {} {}".format(request.method.lower(), request.path_url))
else:
if header.lower() == "host":
value = request.headers.get("host", urlparse(request.url).hostname)
else:
value = request.headers[header]
sts.append("{k}: {v}".format(k=header.lower(), v=value))
return "\n".join(sts).encode()
def __call__(self, request):
self.add_date(request)
self.add_digest(request)
raw_sig = Crypto(self.algorithm).sign(string_to_sign=self.get_string_to_sign(request, self.headers),
key=self.key,
passphrase=self.passphrase)
sig = base64.b64encode(raw_sig).decode()
sig_struct = [("keyId", self.key_id),
("algorithm", self.algorithm),
("headers", " ".join(self.headers)),
("signature", sig)]
request.headers["Authorization"] = "Signature " + ",".join('{}="{}"'.format(k, v) for k, v in sig_struct)
return request
def verify(self, request, key_resolver):
assert "Authorization" in request.headers, "No Authorization header found"
msg = 'Unexpected scheme found in Authorization header (expected "Signature")'
assert request.headers["Authorization"].startswith("Signature "), msg
scheme, sig_struct = request.headers["Authorization"].split(" ", 1)
sig_struct = {i.split("=", 1)[0]: i.split("=", 1)[1].strip('"') for i in sig_struct.split(",")}
for field in "keyId", "algorithm", "signature":
assert field in sig_struct, 'Required signature parameter "{}" not found'.format(field)
assert sig_struct["algorithm"] in self.known_algorithms, "Unknown signature algorithm"
headers = sig_struct.get("headers", "date").split(" ")
sig = base64.b64decode(sig_struct["signature"])
sts = self.get_string_to_sign(request, headers)
key = key_resolver(key_id=sig_struct["keyId"], algorithm=sig_struct["algorithm"])
Crypto(sig_struct["algorithm"]).verify(sig, sts, key)

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[bdist_wheel]
universal=1
[flake8]
max-line-length=120
ignore: E301, E302, E401, E261, E265, E226, F401, E501

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#!/usr/bin/env python
import os, glob
from setuptools import setup, find_packages
setup(
name='requests-http-signature',
version='0.0.1',
url='https://github.com/kislyuk/requests-http-signature',
license='Apache Software License',
author='Andrey Kislyuk',
author_email='kislyuk@gmail.com',
description="A Requests auth module for HTTP Signature",
long_description=open('README.rst').read(),
packages=find_packages(exclude=['test']),
include_package_data=True,
platforms=['MacOS X', 'Posix'],
test_suite='test',
classifiers=[
'Intended Audience :: Developers',
'License :: OSI Approved :: Apache Software License',
'Operating System :: MacOS :: MacOS X',
'Operating System :: POSIX',
'Programming Language :: Python',
'Programming Language :: Python :: 2.7',
'Programming Language :: Python :: 3.3',
'Programming Language :: Python :: 3.4',
'Development Status :: 5 - Production/Stable',
'Topic :: Software Development :: Libraries :: Python Modules'
]
)

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#!/usr/bin/env python
from __future__ import absolute_import, division, print_function, unicode_literals
import os, sys, unittest, json, logging, base64
import requests
from requests.adapters import HTTPAdapter
sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..'))) # noqa
from requests_http_signature import HTTPSignatureAuth
hmac_secret = b"monorail_cat"
passphrase = b"passw0rd"
class TestAdapter(HTTPAdapter):
def send(self, request, *args, **kwargs):
def key_resolver(key_id, algorithm):
if "pubkey" in request.headers:
return base64.b64decode(request.headers["pubkey"])
return hmac_secret
HTTPSignatureAuth(key=hmac_secret).verify(request, key_resolver=key_resolver)
response = requests.Response()
response.status_code = requests.codes.ok
response.url = request.url
return response
class TestRequestsHTTPSignature(unittest.TestCase):
def setUp(self):
logging.basicConfig(level="DEBUG")
self.session = requests.Session()
self.session.mount("http://", TestAdapter())
def test_basic_statements(self):
url = 'http://example.com/path?query#fragment'
self.session.get(url, auth=HTTPSignatureAuth(key=hmac_secret))
with self.assertRaises(AssertionError):
self.session.get(url, auth=HTTPSignatureAuth(key=hmac_secret[::-1]))
def test_rfc_example(self):
url = 'http://example.org/foo'
payload = {"hello": "world"}
date = "Tue, 07 Jun 2014 20:51:35 GMT"
auth = HTTPSignatureAuth(key=hmac_secret,
headers=["(request-target)", "host", "date", "digest", "content-length"])
self.session.post(url, json=payload, headers={"Date": date}, auth=auth)
def test_rsa(self):
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.hazmat.primitives import serialization
private_key = rsa.generate_private_key(
public_exponent=65537,
key_size=2048,
backend=default_backend()
)
private_key_pem = private_key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.PKCS8,
encryption_algorithm=serialization.BestAvailableEncryption(passphrase)
)
public_key_pem = private_key.public_key().public_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PublicFormat.SubjectPublicKeyInfo
)
url = 'http://example.com/path?query#fragment'
auth = HTTPSignatureAuth(algorithm="rsa-sha256", key=private_key_pem, passphrase=passphrase)
self.session.get(url, auth=auth, headers=dict(pubkey=base64.b64encode(public_key_pem)))
if __name__ == '__main__':
unittest.main()