mirror of https://github.com/ansible/ansible.git
Validate SSL certs accessed through urllib*
* Adds another module utility file which generalizes the access of urls via the urllib* libraries. * Adds a new spec generator for common arguments. * Makes the user-agent string configurable. Fixes #6211pull/6392/head
James Cammarata
10 years ago
parent
6577ff5f85
commit
9730157525
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# This code is part of Ansible, but is an independent component.
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# This particular file snippet, and this file snippet only, is BSD licensed.
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# Modules you write using this snippet, which is embedded dynamically by Ansible
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# still belong to the author of the module, and may assign their own license
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# to the complete work.
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#
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# Copyright (c), Michael DeHaan <michael.dehaan@gmail.com>, 2012-2013
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without modification,
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# are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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try:
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import urllib
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HAS_URLLIB = True
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except:
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HAS_URLLIB = False
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try:
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import urllib2
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HAS_URLLIB2 = True
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except:
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HAS_URLLIB2 = False
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try:
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import urlparse
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HAS_URLPARSE = True
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except:
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HAS_URLPARSE = False
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try:
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import ssl
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HAS_SSL=True
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except:
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HAS_SSL=False
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class RequestWithMethod(urllib2.Request):
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'''
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Workaround for using DELETE/PUT/etc with urllib2
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Originally contained in library/net_infrastructure/dnsmadeeasy
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'''
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def __init__(self, url, method, data=None, headers={}):
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self._method = method
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urllib2.Request.__init__(self, url, data, headers)
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def get_method(self):
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if self._method:
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return self._method
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else:
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return urllib2.Request.get_method(self)
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class SSLValidationHandler(urllib2.BaseHandler):
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'''
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A custom handler class for SSL validation.
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Based on:
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http://stackoverflow.com/questions/1087227/validate-ssl-certificates-with-python
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http://techknack.net/python-urllib2-handlers/
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'''
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def __init__(self, module, hostname, port, ca_cert=None):
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self.module = module
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self.hostname = hostname
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self.port = port
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self.ca_cert = ca_cert
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def get_ca_cert(self):
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# tries to find a valid CA cert in one of the
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# standard locations for the current distribution
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if self.ca_cert and os.path.exists(self.ca_cert):
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# the user provided a custom CA cert (ie. one they
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# uploaded themselves), so use it
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return self.ca_cert
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ca_cert = None
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platform = get_platform()
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distribution = get_distribution()
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if platform == 'Linux':
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if distribution in ('Fedora',):
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ca_cert = '/etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem'
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elif distribution in ('RHEL','CentOS','ScientificLinux'):
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ca_cert = '/etc/pki/tls/certs/ca-bundle.crt'
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elif distribution in ('Ubuntu','Debian'):
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ca_cert = '/usr/share/ca-certificates/cacert.org/cacert.org.crt'
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elif platform == 'FreeBSD':
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ca_cert = '/usr/local/share/certs/ca-root.crt'
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elif platform == 'OpenBSD':
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ca_cert = '/etc/ssl/cert.pem'
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elif platform == 'NetBSD':
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ca_cert = '/etc/openssl/certs/ca-cert.pem'
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elif platform == 'SunOS':
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# FIXME?
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pass
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elif platform == 'AIX':
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# FIXME?
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pass
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if ca_cert and os.path.exists(ca_cert):
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return ca_cert
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elif os.path.exists('/etc/ansible/ca-cert.pem'):
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# fall back to a user-deployed cert in a standard
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# location if the OS platform one is not available
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return '/etc/ansible/ca-cert.pem'
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else:
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# CA cert isn't available, no validation
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return None
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def http_request(self, req):
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try:
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server_cert = ssl.get_server_certificate((self.hostname, self.port), ca_certs=self.get_ca_cert())
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except ssl.SSLError:
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self.module.fail_json(msg='failed to validate the SSL certificate for %s:%s. You can use validate_certs=no, however this is unsafe and not recommended' % (self.hostname, self.port))
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return req
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https_request = http_request
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def url_argument_spec():
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'''
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Creates an argument spec that can be used with any module
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that will be requesting content via urllib/urllib2
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'''
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return dict(
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url = dict(),
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force = dict(default='no', aliases=['thirsty'], type='bool'),
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http_agent = dict(default='ansible-httpget'),
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use_proxy = dict(default='yes', type='bool'),
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validate_certs = dict(default='yes', type='bool'),
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)
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def fetch_url(module, url, data=None, headers=None, method=None,
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use_proxy=False, validate_certs=True, force=False, last_mod_time=None, timeout=10):
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'''
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Fetches a file from an HTTP/FTP server using urllib2
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'''
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if not HAS_URLLIB:
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module.fail_json(msg='urllib is not installed')
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if not HAS_URLLIB2:
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module.fail_json(msg='urllib2 is not installed')
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elif not HAS_URLPARSE:
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module.fail_json(msg='urlparse is not installed')
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r = None
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handlers = []
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info = dict(url=url)
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parsed = urlparse.urlparse(url)
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if parsed[0] == 'https':
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if not HAS_SSL and validate_certs:
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module.fail_json(msg='SSL validation is not available in your version of python. You can use validate_certs=no, however this is unsafe and not recommended')
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elif validate_certs:
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# do the cert validation
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netloc = parsed[1]
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if '@' in netloc:
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netloc = netloc.split('@', 1)[1]
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if ':' in netloc:
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hostname, port = netloc.split(':', 1)
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else:
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hostname = netloc
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port = 443
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# create the SSL validation handler and
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# add it to the list of handlers
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ssl_handler = SSLValidationHandler(module, hostname, port)
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handlers.append(ssl_handler)
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if '@' in parsed[1]:
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credentials, netloc = parsed[1].split('@', 1)
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if ':' in credentials:
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username, password = credentials.split(':', 1)
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else:
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username = credentials
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password = ''
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parsed = list(parsed)
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parsed[1] = netloc
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passman = urllib2.HTTPPasswordMgrWithDefaultRealm()
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# this creates a password manager
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passman.add_password(None, netloc, username, password)
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# because we have put None at the start it will always
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# use this username/password combination for urls
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# for which `theurl` is a super-url
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authhandler = urllib2.HTTPBasicAuthHandler(passman)
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# create the AuthHandler
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handlers.append(authhandler)
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#reconstruct url without credentials
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url = urlparse.urlunparse(parsed)
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if not use_proxy:
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proxyhandler = urllib2.ProxyHandler({})
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handlers.append(proxyhandler)
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opener = urllib2.build_opener(*handlers)
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urllib2.install_opener(opener)
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if method:
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if method.upper() not in ('OPTIONS','GET','HEAD','POST','PUT','DELETE','TRACE','CONNECT'):
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module.fail_json(msg='invalid HTTP request method; %s' % method.upper())
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request = RequestWithMethod(url, method.upper(), data)
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else:
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request = urllib2.Request(url, data)
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# add the custom agent header, to help prevent issues
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# with sites that block the default urllib agent string
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request.add_header('User-agent', module.params.get('http_agent'))
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# if we're ok with getting a 304, set the timestamp in the
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# header, otherwise make sure we don't get a cached copy
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if last_mod_time and not force:
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tstamp = last_mod_time.strftime('%a, %d %b %Y %H:%M:%S +0000')
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request.add_header('If-Modified-Since', tstamp)
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else:
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request.add_header('cache-control', 'no-cache')
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# user defined headers now, which may override things we've set above
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if headers:
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if not isinstance(headers, dict):
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module.fail_json("headers provided to fetch_url() must be a dict")
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for header in headers:
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request.add_header(header, headers[header])
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try:
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if sys.version_info < (2,6,0):
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# urlopen in python prior to 2.6.0 did not
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# have a timeout parameter
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r = urllib2.urlopen(request, None)
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else:
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r = urllib2.urlopen(request, None, timeout)
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info.update(r.info())
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info['url'] = r.geturl() # The URL goes in too, because of redirects.
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info.update(dict(msg="OK (%s bytes)" % r.headers.get('Content-Length', 'unknown'), status=200))
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except urllib2.HTTPError, e:
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info.update(dict(msg=str(e), status=e.code))
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except urllib2.URLError, e:
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code = int(getattr(e, 'code', -1))
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info.update(dict(msg="Request failed: %s" % str(e), status=code))
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return r, info
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