Merge "Verify that host matches certificate"

glanceclient/common/http.py

@@ -243,6 +243,8 @@ class VerifiedHTTPSConnection(httplib.HTTPSConnection):
     """
     Extended HTTPSConnection which uses the OpenSSL library
     for enhanced SSL support.
+    Note: Much of this functionality can eventually be replaced
+          with native Python 3.3 code.
     """
     def __init__(self, host, port, key_file=None, cert_file=None,
                  ca_file=None, timeout=None, insecure=False,
@@ -259,9 +261,47 @@ class VerifiedHTTPSConnection(httplib.HTTPSConnection):
         self.setcontext()
 
     @staticmethod
-    def verify_callback(connection, x509, errnum, errdepth, preverify_ok):
-        # Pass through OpenSSL's default result
-        return preverify_ok
+    def host_matches_cert(host, x509):
+        """
+        Verify that the the x509 certificate we have received
+        from 'host' correctly identifies the server we are
+        connecting to, ie that the certificate's Common Name
+        or a Subject Alternative Name matches 'host'.
+        """
+        # First see if we can match the CN
+        if x509.get_subject().commonName == host:
+            return True
+
+        # Also try Subject Alternative Names for a match
+        san_list = None
+        for i in xrange(x509.get_extension_count()):
+            ext = x509.get_extension(i)
+            if ext.get_short_name() == 'subjectAltName':
+                san_list = str(ext)
+                for san in ''.join(san_list.split()).split(','):
+                    if san == "DNS:%s" % host:
+                        return True
+
+        # Server certificate does not match host
+        msg = ('Host "%s" does not match x509 certificate contents: '
+               'CommonName "%s"' % (host, x509.get_subject().commonName))
+        if san_list is not None:
+            msg = msg + ', subjectAltName "%s"' % san_list
+        raise exc.SSLCertificateError(msg)
+
+    def verify_callback(self, connection, x509, errnum,
+                        depth, preverify_ok):
+        if x509.has_expired():
+            msg = "SSL Certificate expired on '%s'" % x509.get_notAfter()
+            raise exc.SSLCertificateError(msg)
+
+        if depth == 0 and preverify_ok is True:
+            # We verify that the host matches against the last
+            # certificate in the chain
+            return self.host_matches_cert(self.host, x509)
+        else:
+            # Pass through OpenSSL's default result
+            return preverify_ok
 
     def setcontext(self):
         """

glanceclient/exc.py

@@ -168,3 +168,7 @@ class EndpointNotFound(Exception):
 
 class SSLConfigurationError(BaseException):
     pass
+
+
+class SSLCertificateError(BaseException):
+    pass

tests/test_ssl.py

@@ -16,9 +16,12 @@
 import os
 import unittest
 
+from OpenSSL import crypto
+
 from glanceclient import exc
 from glanceclient.common import http
 
+
 TEST_VAR_DIR = os.path.abspath(os.path.join(os.path.dirname(__file__),
                                             'var'))
 
@@ -110,3 +113,74 @@ class TestVerifiedHTTPSConnection(unittest.TestCase):
             self.fail('Failed to raise assertion.')
         except exc.SSLConfigurationError:
             pass
+
+    def test_ssl_cert_cname(self):
+        """
+        Test certificate: CN match
+        """
+        cert_file = os.path.join(TEST_VAR_DIR, 'certificate.crt')
+        cert = crypto.load_certificate(crypto.FILETYPE_PEM,
+                                       file(cert_file).read())
+        # The expected cert should have CN=0.0.0.0
+        self.assertEqual(cert.get_subject().commonName, '0.0.0.0')
+        try:
+            conn = http.VerifiedHTTPSConnection('0.0.0.0', 0)
+            conn.verify_callback(None, cert, 0, 0, True)
+        except:
+            self.fail('Unexpected exception.')
+
+    def test_ssl_cert_subject_alt_name(self):
+        """
+        Test certificate: SAN match
+        """
+        cert_file = os.path.join(TEST_VAR_DIR, 'certificate.crt')
+        cert = crypto.load_certificate(crypto.FILETYPE_PEM,
+                                       file(cert_file).read())
+        # The expected cert should have CN=0.0.0.0
+        self.assertEqual(cert.get_subject().commonName, '0.0.0.0')
+        try:
+            conn = http.VerifiedHTTPSConnection('alt1.example.com', 0)
+            conn.verify_callback(None, cert, 0, 0, True)
+        except:
+            self.fail('Unexpected exception.')
+
+        try:
+            conn = http.VerifiedHTTPSConnection('alt2.example.com', 0)
+            conn.verify_callback(None, cert, 0, 0, True)
+        except:
+            self.fail('Unexpected exception.')
+
+    def test_ssl_cert_mismatch(self):
+        """
+        Test certificate: bogus host
+        """
+        cert_file = os.path.join(TEST_VAR_DIR, 'certificate.crt')
+        cert = crypto.load_certificate(crypto.FILETYPE_PEM,
+                                       file(cert_file).read())
+        # The expected cert should have CN=0.0.0.0
+        self.assertEqual(cert.get_subject().commonName, '0.0.0.0')
+        try:
+            conn = http.VerifiedHTTPSConnection('mismatch.example.com', 0)
+        except:
+            self.fail('Failed to init VerifiedHTTPSConnection.')
+
+        self.assertRaises(exc.SSLCertificateError,
+                          conn.verify_callback, None, cert, 0, 0, True)
+
+    def test_ssl_expired_cert(self):
+        """
+        Test certificate: out of date cert
+        """
+        cert_file = os.path.join(TEST_VAR_DIR, 'expired-cert.crt')
+        cert = crypto.load_certificate(crypto.FILETYPE_PEM,
+                                       file(cert_file).read())
+        # The expected expired cert has CN=openstack.example.com
+        self.assertEqual(cert.get_subject().commonName,
+                         'openstack.example.com')
+        try:
+            conn = http.VerifiedHTTPSConnection('openstack.example.com', 0)
+        except:
+            self.fail('Failed to init VerifiedHTTPSConnection.')
+
+        self.assertRaises(exc.SSLCertificateError,
+                          conn.verify_callback, None, cert, 0, 0, True)

tests/var/ca.crt

@@ -1,35 +1,34 @@
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 -----END CERTIFICATE-----

tests/var/certificate.crt

@@ -1,30 +1,66 @@
+# Certificate:
+#    Data:
+#        Version: 3 (0x2)
+#        Serial Number: 1 (0x1)
+#        Signature Algorithm: sha1WithRSAEncryption
+#        Issuer: O=Openstack CA Org, OU=Openstack Test CA/emailAddress=admin@ca.example.com,
+#                L=State CA, ST=CA, C=AU, CN=Openstack Test Certificate Authority
+#        Validity
+#            Not Before: Nov 16 12:50:19 2012 GMT
+#            Not After : Apr  3 12:50:19 2040 GMT
+#        Subject: O=Openstack Test Org, OU=Openstack Test Unit/emailAddress=admin@example.com,
+#                 L=State1, ST=CA, C=US, CN=0.0.0.0
+#        Subject Public Key Info:
+#            Public Key Algorithm: rsaEncryption
+#            RSA Public Key: (4096 bit)
+#                Modulus (4096 bit):
+#                    00:d4:bb:3a:c4:a0:06:54:31:23:5d:b0:78:5a:be:
+#                    45:44:ae:a1:89:86:11:d8:ca:a8:33:b0:4f:f3:e1:
+#                    .
+#                    .
+#                    .
+#                Exponent: 65537 (0x10001)
+#        X509v3 extensions:
+#            X509v3 Subject Alternative Name:
+#                DNS:alt1.example.com, DNS:alt2.example.com
+#    Signature Algorithm: sha1WithRSAEncryption
+#        2c:fc:5c:87:24:bd:4a:fa:40:d2:2e:35:a4:2a:f3:1c:b3:67:
+#        b0:e4:8a:cd:67:6b:55:50:d4:cb:dd:2d:26:a5:15:62:90:a3:
+#        .
+#        .
+#        .
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+tdc5rw==
 -----END CERTIFICATE-----

tests/var/expired-cert.crt

@@ -0,0 +1,35 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

tests/var/privatekey.key

@@ -1,51 +1,51 @@
 -----BEGIN RSA PRIVATE KEY-----
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+l00GHLYAr5Nv/WqVnl/VLMd9rOCnLck+pxBNSa6dTrp3FuY00son6hneIvkv
 -----END RSA PRIVATE KEY-----