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SAML login for AWS using Shibboleth IDP

Project description

==============
AWS SAML Login
==============

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This Python package provides some helper functions to allow programmatic retrieval of temporary AWS credentials from STS_ (Security Token Service) when using federated login with `Shibboleth Identity Provider`_. Currently it supports only Shibboleth IDP.

The implementation relies on HTML parsing of the Shibboleth redirect page (HTML form) and the AWS role selection page.

This package requires Python 3.4.

Installation
============

.. code-block:: bash

$ sudo pip3 install --upgrade aws-saml-login

Usage
=====

.. code-block:: python

from aws_saml_login import authenticate, assume_role, write_aws_credentials, get_boto3_session

# authenticate against identity provider
saml_xml, roles = authenticate('https://shibboleth-idp.example.org', user, password)

print(roles)

# just use the first role here, we might display a user dialog to choose one
first_role = roles[0]

provider_arn, role_arn, account_name = first_role

# get temporary AWS credentials
key_id, secret, session_token = assume_role(saml_xml, provider_arn, role_arn)

# write to ~/.aws/credentials
write_aws_credentials('default', key_id, secret, session_token)

# get boto3 session
session = get_boto3_session(key_id, secret, session_token)
ec2 = session.resource('ec2', 'eu-west-1')
iam = session.client('iam')

# get boto3 session with default region eu-central-1
session = get_boto3_session(key_id, secret, session_token, 'eu-central-1')
ec2 = session.resource('ec2')

# get session for the first 5 roles
sessions = {}
for role in roles[:5]:
provider_arn, role_arn, account_name = role
key_id, secret, session_token, expiration = assume_role(saml_xml, provider_arn, role_arn)
sessions['{} {}'.format(account_name,role_arn.split(':')[-1])] = get_boto3_session(key_id, secret, session_token)

for key in sessions.keys():
print('Key: {} / AccountAlias: {}'
.format(key,
sessions[key].client('iam').list_account_aliases()['AccountAliases']))
# AWS SDK (e.g. boto) can be used to call AWS endpoints

.. _STS: http://docs.aws.amazon.com/STS/latest/UsingSTS/Welcome.html
.. _Shibboleth IDP: http://shibboleth.net/products/identity-provider.html


shibboleth configuration
========================

.. code-block:: xml

<rp:RelyingPartyGroup ...>
...
<!-- ========================================== -->
<!-- Metadata Configuration -->
<!-- ========================================== -->
<!-- MetadataProvider the combining other MetadataProviders -->
<metadata:MetadataProvider id="ShibbolethMetadata" xsi:type="metadata:ChainingMetadataProvider">
...
<metadata:MetadataProvider id="amazon-webservices" xsi:type="metadata:FileBackedHTTPMetadataProvider"
metadataURL="https://signin.aws.amazon.com/static/saml-metadata.xml"
backingFile="shibboleth-idp/metadata/amazon-webservices.xml">
</metadata:MetadataProvider>
...
</metadata:MetadataProvider>
...
<rp:RelyingParty id="urn:amazon:webservices"
provider="https://myidp.example.org/shibboleth"
defaultSigningCredentialRef="IdPCredential">
<rp:ProfileConfiguration xsi:type="saml:SAML2SSOProfile" includeAttributeStatement="true"
assertionLifetime="PT5M" assertionProxyCount="0"
signResponses="never" signAssertions="always"
encryptAssertions="never" encryptNameIds="never"/>
</rp:RelyingParty>
...
</rp:RelyingPartyGroup>

<resolver:AttributeResolver ...>
...
<!-- ========================================== -->
<!-- AWS Connectors -->
<!-- ========================================== -->
<resolver:AttributeDefinition id="awsRoles" xsi:type="ad:Mapped" sourceAttributeID="memberof">
<resolver:Dependency ref="corpLDAP"/>
<resolver:AttributeEncoder
xsi:type="enc:SAML2String"
name="https://aws.amazon.com/SAML/Attributes/Role"
friendlyName="Role" />
<ad:ValueMap>
<ad:ReturnValue>arn:aws:iam::$2:saml-provider/Shibboleth,arn:aws:iam::$2:role/Shibboleth-$1</ad:ReturnValue>
<ad:SourceValue ignoreCase="true">cn=([^,]*),ou=Roles,ou=[^,]*?([0-9]+),ou=AWS.*</ad:SourceValue>
</ad:ValueMap>
</resolver:AttributeDefinition>

<resolver:AttributeDefinition id="awsRoleSessionName" xsi:type="ad:Simple" sourceAttributeID="uid">
<resolver:Dependency ref="corpLDAP"/>
<resolver:AttributeEncoder
xsi:type="enc:SAML2String"
name="https://aws.amazon.com/SAML/Attributes/RoleSessionName"
friendlyName="RoleSessionName" />
</resolver:AttributeDefinition>
...
</resolver:AttributeResolver>

<afp:AttributeFilterPolicyGroup ...>
...
<afp:AttributeFilterPolicy id="afP_aws">
<afp:PolicyRequirementRule xsi:type="basic:AttributeRequesterString" value="urn:amazon:webservices" />
<afp:AttributeRule attributeID="transientId">
<afp:PermitValueRule xsi:type="basic:ANY"/>
</afp:AttributeRule>
<afp:AttributeRule attributeID="awsRoles">
<afp:PermitValueRule xsi:type="basic:ANY"/>
</afp:AttributeRule>
<afp:AttributeRule attributeID="awsRoleSessionName">
<afp:PermitValueRule xsi:type="basic:ANY"/>
</afp:AttributeRule>
</afp:AttributeFilterPolicy>
...
</afp:AttributeFilterPolicyGroup>

To login, you must open the right providerId with the Unsolicited/SSO URL:
https://myidp.example.org/profile/SAML2/Unsolicited/SSO?providerId=urn:amazon:webservices


License
=======

Copyright © 2015 Zalando SE

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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