azure: Filter list of ssh keys pulled from fabric

The Azure data source is expected to expose a list of
ssh keys for the user-to-be-provisioned in the crawled
metadata. When configured to use the __builtin__ agent
this list is built by the WALinuxAgentShim. The shim
retrieves the full set of certificates and public keys
exposed to the VM from the wireserver, extracts any
ssh keys it can, and returns that list.

This fix reduces that list of ssh keys to just the
ones whose fingerprints appear in the "administrative
user" section of the ovf-env.xml file. The Azure
control plane exposes other ssh keys to the VM for
other reasons, but those should not be added to the
authorized_keys file for the provisioned user.

5 files changed, 235 insertions, 6 deletions

diff --git a/tests/data/azure/parse_certificates_fingerprints b/tests/data/azure/parse_certificates_fingerprints
new file mode 100644
index 00000000..f7293c56
--- /dev/null
+++ b/tests/data/azure/parse_certificates_fingerprints
@@ -0,0 +1,4 @@
+ECEDEB3B8488D31AF3BC4CCED493F64B7D27D7B1
+073E19D14D1C799224C6A0FD8DDAB6A8BF27D473
+4C16E7FAD6297D74A9B25EB8F0A12808CEBE293E
+929130695289B450FE45DCD5F6EF0CDE69865867
diff --git a/tests/data/azure/parse_certificates_pem b/tests/data/azure/parse_certificates_pem
new file mode 100644
index 00000000..3521ea3a
--- /dev/null
+++ b/tests/data/azure/parse_certificates_pem
@@ -0,0 +1,152 @@
+Bag Attributes
+    localKeyID: 01 00 00 00
+    Microsoft CSP Name: Microsoft Enhanced Cryptographic Provider v1.0
+Key Attributes
+    X509v3 Key Usage: 10
+-----BEGIN PRIVATE KEY-----
+MIIEwAIBADANBgkqhkiG9w0BAQEFAASCBKowggSmAgEAAoIBAQDlEe5fUqwdrQTP
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+RyWd+p2lYvFkC/jORQtDMY4uW1o=
+-----END PRIVATE KEY-----
+Bag Attributes
+    localKeyID: 02 00 00 00
+    Microsoft CSP Name: Microsoft Strong Cryptographic Provider
+Key Attributes
+    X509v3 Key Usage: 10
+-----BEGIN PRIVATE KEY-----
+MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDlQhPrZwVQYFV4
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+R/fA67HXFSTT+OncdRpY1NOn
+-----END PRIVATE KEY-----
+Bag Attributes: <Empty Attributes>
+subject=/CN=CRP/OU=AzureRT/O=Microsoft Corporation/L=Redmond/ST=WA/C=US
+issuer=/CN=Root Agency
+-----BEGIN CERTIFICATE-----
+MIIB+TCCAeOgAwIBAgIBATANBgkqhkiG9w0BAQUFADAWMRQwEgYDVQQDDAtSb290
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+-----END CERTIFICATE-----
+Bag Attributes
+    localKeyID: 01 00 00 00
+subject=/C=US/ST=WASHINGTON/L=Seattle/O=Microsoft/OU=Azure/CN=AnhVo/emailAddress=redacted@microsoft.com
+issuer=/C=US/ST=WASHINGTON/L=Seattle/O=Microsoft/OU=Azure/CN=AnhVo/emailAddress=redacted@microsoft.com
+-----BEGIN CERTIFICATE-----
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+3g==
+-----END CERTIFICATE-----
+Bag Attributes
+    localKeyID: 02 00 00 00
+subject=/CN=/subscriptions/redacted/resourcegroups/redacted/providers/Microsoft.Compute/virtualMachines/redacted
+issuer=/CN=Microsoft.ManagedIdentity
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+Bag Attributes: <Empty Attributes>
+subject=/CN=CRP/OU=AzureRT/O=Microsoft Corporation/L=Redmond/ST=WA/C=US
+issuer=/CN=Root Agency
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/tests/data/azure/pubkey_extract_cert b/tests/data/azure/pubkey_extract_cert
new file mode 100644
index 00000000..ce9b852d
--- /dev/null
+++ b/tests/data/azure/pubkey_extract_cert
@@ -0,0 +1,13 @@
+-----BEGIN CERTIFICATE-----
+MIIB+TCCAeOgAwIBAgIBATANBgkqhkiG9w0BAQUFADAWMRQwEgYDVQQDDAtSb290
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+-----END CERTIFICATE-----
diff --git a/tests/data/azure/pubkey_extract_ssh_key b/tests/data/azure/pubkey_extract_ssh_key
new file mode 100644
index 00000000..54d749ed
--- /dev/null
+++ b/tests/data/azure/pubkey_extract_ssh_key
@@ -0,0 +1 @@
+ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDHU9IDclbKVYVbYuv0+zViX+wTwlKspslmy/uf3hkWLh7pyzyrq70S7qtSW2EGixUPxZS/R8pOLHoinlKF9ILgj0gVTCJsSwnWpXRg3rhZwIVoYMHN50BHS1SqVD0lsWNMXmo76LoJcjmWvwIznvj5C/gnhU+K7+c3m7AlCyU2wjwpBAEYj7PQs6l/wTqpEiaqC5NytNBd7qp+lYYysVrpa1PFL0Nj4MMZARIfjkiJtL9qDhy9YZeJRQ6q/Fhz0kjvkZnfxixfKF4yWzOfhBrAtpF6oOnuYKk3hxjh9KjTTX4/U8zdLojalX09iyHyEjwJKGlGEpzh1aY7t5btUyvp
diff --git a/tests/unittests/test_datasource/test_azure_helper.py b/tests/unittests/test_datasource/test_azure_helper.py
index 26b2b93d..02556165 100644
--- a/tests/unittests/test_datasource/test_azure_helper.py
+++ b/tests/unittests/test_datasource/test_azure_helper.py
@@ -1,11 +1,13 @@
 # This file is part of cloud-init. See LICENSE file for license information.
 
 import os
+import unittest2
 from textwrap import dedent
 
 from cloudinit.sources.helpers import azure as azure_helper
 from cloudinit.tests.helpers import CiTestCase, ExitStack, mock, populate_dir
 
+from cloudinit.util import load_file
 from cloudinit.sources.helpers.azure import WALinuxAgentShim as wa_shim
 
 GOAL_STATE_TEMPLATE = """\
@@ -289,6 +291,50 @@ class TestOpenSSLManager(CiTestCase):
         self.assertEqual([mock.call(manager.tmpdir)], del_dir.call_args_list)
 
 
+class TestOpenSSLManagerActions(CiTestCase):
+
+    def setUp(self):
+        super(TestOpenSSLManagerActions, self).setUp()
+
+        self.allowed_subp = True
+
+    def _data_file(self, name):
+        path = 'tests/data/azure'
+        return os.path.join(path, name)
+
+    @unittest2.skip("todo move to cloud_test")
+    def test_pubkey_extract(self):
+        cert = load_file(self._data_file('pubkey_extract_cert'))
+        good_key = load_file(self._data_file('pubkey_extract_ssh_key'))
+        sslmgr = azure_helper.OpenSSLManager()
+        key = sslmgr._get_ssh_key_from_cert(cert)
+        self.assertEqual(good_key, key)
+
+        good_fingerprint = '073E19D14D1C799224C6A0FD8DDAB6A8BF27D473'
+        fingerprint = sslmgr._get_fingerprint_from_cert(cert)
+        self.assertEqual(good_fingerprint, fingerprint)
+
+    @unittest2.skip("todo move to cloud_test")
+    @mock.patch.object(azure_helper.OpenSSLManager, '_decrypt_certs_from_xml')
+    def test_parse_certificates(self, mock_decrypt_certs):
+        """Azure control plane puts private keys as well as certificates
+           into the Certificates XML object. Make sure only the public keys
+           from certs are extracted and that fingerprints are converted to
+           the form specified in the ovf-env.xml file.
+        """
+        cert_contents = load_file(self._data_file('parse_certificates_pem'))
+        fingerprints = load_file(self._data_file(
+            'parse_certificates_fingerprints')
+        ).splitlines()
+        mock_decrypt_certs.return_value = cert_contents
+        sslmgr = azure_helper.OpenSSLManager()
+        keys_by_fp = sslmgr.parse_certificates('')
+        for fp in keys_by_fp.keys():
+            self.assertIn(fp, fingerprints)
+        for fp in fingerprints:
+            self.assertIn(fp, keys_by_fp)
+
+
 class TestWALinuxAgentShim(CiTestCase):
 
     def setUp(self):
@@ -329,18 +375,31 @@ class TestWALinuxAgentShim(CiTestCase):
 
     def test_certificates_used_to_determine_public_keys(self):
         shim = wa_shim()
-        data = shim.register_with_azure_and_fetch_data()
+        """if register_with_azure_and_fetch_data() isn't passed some info about
+           the user's public keys, there's no point in even trying to parse
+           the certificates
+        """
+        mypk = [{'fingerprint': 'fp1', 'path': 'path1'},
+                {'fingerprint': 'fp3', 'path': 'path3', 'value': ''}]
+        certs = {'fp1': 'expected-key',
+                 'fp2': 'should-not-be-found',
+                 'fp3': 'expected-no-value-key',
+                 }
+        sslmgr = self.OpenSSLManager.return_value
+        sslmgr.parse_certificates.return_value = certs
+        data = shim.register_with_azure_and_fetch_data(pubkey_info=mypk)
         self.assertEqual(
             [mock.call(self.GoalState.return_value.certificates_xml)],
-            self.OpenSSLManager.return_value.parse_certificates.call_args_list)
-        self.assertEqual(
-            self.OpenSSLManager.return_value.parse_certificates.return_value,
-            data['public-keys'])
+            sslmgr.parse_certificates.call_args_list)
+        self.assertIn('expected-key', data['public-keys'])
+        self.assertIn('expected-no-value-key', data['public-keys'])
+        self.assertNotIn('should-not-be-found', data['public-keys'])
 
     def test_absent_certificates_produces_empty_public_keys(self):
+        mypk = [{'fingerprint': 'fp1', 'path': 'path1'}]
         self.GoalState.return_value.certificates_xml = None
         shim = wa_shim()
-        data = shim.register_with_azure_and_fetch_data()
+        data = shim.register_with_azure_and_fetch_data(pubkey_info=mypk)
         self.assertEqual([], data['public-keys'])
 
     def test_correct_url_used_for_report_ready(self):