api: reorganize key API

sros2/sros2/api/__init__.py

@@ -13,23 +13,12 @@
 # limitations under the License.
 
 from collections import namedtuple
-import errno
 import os
 import sys
 
-from cryptography import x509
-from cryptography.hazmat.backends import default_backend as cryptography_backend
-from cryptography.hazmat.primitives import serialization
+from sros2.policy import load_policy
 
-from rclpy.exceptions import InvalidNamespaceException
-from rclpy.validate_namespace import validate_namespace
-
-from sros2.policy import (
-    get_policy_default,
-    load_policy,
-)
-
-from . import _keystore, _permission, _policy, _utilities
+from . import _key, _keystore, _permission, _policy
 
 HIDDEN_NODE_PREFIX = '_'
 
@@ -77,99 +66,6 @@ def get_client_info(node, node_name):
     return get_topics(node_name, node.get_client_names_and_types_by_node)
 
 
-def is_key_name_valid(name):
-    # TODO(ivanpauno): Use validate_security_context_name when it's propagated to `rclpy`.
-    #   This is not to bad for the moment.
-    #   Related with https://github.com/ros2/rclpy/issues/528.
-    try:
-        return validate_namespace(name)
-    except InvalidNamespaceException as e:
-        print(e)
-        return False
-
-
-def create_key(keystore_path, identity):
-    if not _keystore.is_valid_keystore(keystore_path):
-        print("'%s' is not a valid keystore " % keystore_path)
-        return False
-    if not is_key_name_valid(identity):
-        return False
-    print("creating key for identity: '%s'" % identity)
-
-    relative_path = os.path.normpath(identity.lstrip('/'))
-    key_dir = os.path.join(_keystore.get_keystore_context_dir(keystore_path), relative_path)
-    os.makedirs(key_dir, exist_ok=True)
-
-    # symlink the CA cert in there
-    public_certs = ['identity_ca.cert.pem', 'permissions_ca.cert.pem']
-    for public_cert in public_certs:
-        dst = os.path.join(key_dir, public_cert)
-        keystore_ca_cert_path = os.path.join(
-            _keystore.get_keystore_public_dir(keystore_path), public_cert)
-        relativepath = os.path.relpath(keystore_ca_cert_path, key_dir)
-        _utilities.create_symlink(src=relativepath, dst=dst)
-
-    # symlink the governance file in there
-    keystore_governance_path = os.path.join(
-        _keystore.get_keystore_context_dir(keystore_path), 'governance.p7s')
-    dest_governance_path = os.path.join(key_dir, 'governance.p7s')
-    relativepath = os.path.relpath(keystore_governance_path, key_dir)
-    _utilities.create_symlink(src=relativepath, dst=dest_governance_path)
-
-    keystore_identity_ca_cert_path = os.path.join(
-        _keystore.get_keystore_public_dir(keystore_path), 'identity_ca.cert.pem')
-    keystore_identity_ca_key_path = os.path.join(
-        _keystore.get_keystore_private_dir(keystore_path), 'identity_ca.key.pem')
-
-    cert_path = os.path.join(key_dir, 'cert.pem')
-    key_path = os.path.join(key_dir, 'key.pem')
-    if not os.path.isfile(cert_path) or not os.path.isfile(key_path):
-        print('creating cert and key')
-        _create_key_and_cert(
-            keystore_identity_ca_cert_path,
-            keystore_identity_ca_key_path,
-            identity,
-            cert_path,
-            key_path
-        )
-    else:
-        print('found cert and key; not creating new ones!')
-
-    # create a wildcard permissions file for this node which can be overridden
-    # later using a policy if desired
-    policy_file_path = get_policy_default('policy.xml')
-    policy_element = _policy.get_policy('/', policy_file_path)
-    context_element = policy_element.find('contexts/context')
-    context_element.attrib['path'] = identity
-
-    permissions_path = os.path.join(key_dir, 'permissions.xml')
-    _permission.create_permission_file(permissions_path, _utilities.domain_id(), policy_element)
-
-    signed_permissions_path = os.path.join(key_dir, 'permissions.p7s')
-    keystore_permissions_ca_key_path = os.path.join(
-        _keystore.get_keystore_private_dir(keystore_path), 'permissions_ca.key.pem')
-    _utilities.create_smime_signed_file(
-        keystore_ca_cert_path,
-        keystore_permissions_ca_key_path,
-        permissions_path,
-        signed_permissions_path
-    )
-
-    return True
-
-
-def list_keys(keystore_path):
-    contexts_path = _keystore.get_keystore_context_dir(keystore_path)
-    if not os.path.isdir(keystore_path):
-        raise FileNotFoundError(errno.ENOENT, os.strerror(errno.ENOENT), keystore_path)
-    if not os.path.isdir(contexts_path):
-        return True
-    for name in os.listdir(contexts_path):
-        if os.path.isdir(os.path.join(contexts_path, name)):
-            print(name)
-    return True
-
-
 def distribute_key(source_keystore_path, taget_keystore_path):
     raise NotImplementedError()
 
@@ -193,35 +89,17 @@ def generate_artifacts(keystore_path=None, identity_names=[], policy_files=[]):
 
     # create keys for all provided identities
     for identity in identity_names:
-        if not create_key(keystore_path, identity):
+        if not _key.create_key(keystore_path, identity):
             return False
     for policy_file in policy_files:
         policy_tree = load_policy(policy_file)
         contexts_element = policy_tree.find('contexts')
         for context in contexts_element:
             identity_name = context.get('path')
             if identity_name not in identity_names:
-                if not create_key(keystore_path, identity_name):
+                if not _key.create_key(keystore_path, identity_name):
                     return False
             policy_element = _policy.get_policy_from_tree(identity_name, policy_tree)
             _permission.create_permissions_from_policy_element(
                 keystore_path, identity_name, policy_element)
     return True
-
-
-def _create_key_and_cert(
-        keystore_ca_cert_path, keystore_ca_key_path, identity, cert_path, key_path):
-    # Load the CA cert and key from disk
-    with open(keystore_ca_cert_path, 'rb') as f:
-        ca_cert = x509.load_pem_x509_certificate(f.read(), cryptography_backend())
-
-    with open(keystore_ca_key_path, 'rb') as f:
-        ca_key = serialization.load_pem_private_key(f.read(), None, cryptography_backend())
-
-    cert, private_key = _utilities.build_key_and_cert(
-        x509.Name([x509.NameAttribute(x509.oid.NameOID.COMMON_NAME, identity)]),
-        issuer_name=ca_cert.subject,
-        ca_key=ca_key)
-
-    _utilities.write_key(private_key, key_path)
-    _utilities.write_cert(cert, cert_path)

sros2/sros2/api/_key.py

@@ -0,0 +1,139 @@
+# Copyright 2019-2020 Canonical Ltd
+# Copyright 2016-2019 Open Source Robotics Foundation, Inc.
+#
+# 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.
+
+import errno
+import os
+
+from cryptography import x509
+from cryptography.hazmat.backends import default_backend as cryptography_backend
+from cryptography.hazmat.primitives import serialization
+
+from rclpy.exceptions import InvalidNamespaceException
+from rclpy.validate_namespace import validate_namespace
+
+from sros2.policy import get_policy_default
+
+from . import _keystore, _permission, _policy, _utilities
+
+
+def create_key(keystore_path, identity):
+    if not _keystore.is_valid_keystore(keystore_path):
+        print("'%s' is not a valid keystore " % keystore_path)
+        return False
+    if not _is_key_name_valid(identity):
+        return False
+    print("creating key for identity: '%s'" % identity)
+
+    relative_path = os.path.normpath(identity.lstrip('/'))
+    key_dir = os.path.join(_keystore.get_keystore_context_dir(keystore_path), relative_path)
+    os.makedirs(key_dir, exist_ok=True)
+
+    # symlink the CA cert in there
+    public_certs = ['identity_ca.cert.pem', 'permissions_ca.cert.pem']
+    for public_cert in public_certs:
+        dst = os.path.join(key_dir, public_cert)
+        keystore_ca_cert_path = os.path.join(
+            _keystore.get_keystore_public_dir(keystore_path), public_cert)
+        relativepath = os.path.relpath(keystore_ca_cert_path, key_dir)
+        _utilities.create_symlink(src=relativepath, dst=dst)
+
+    # symlink the governance file in there
+    keystore_governance_path = os.path.join(
+        _keystore.get_keystore_context_dir(keystore_path), 'governance.p7s')
+    dest_governance_path = os.path.join(key_dir, 'governance.p7s')
+    relativepath = os.path.relpath(keystore_governance_path, key_dir)
+    _utilities.create_symlink(src=relativepath, dst=dest_governance_path)
+
+    keystore_identity_ca_cert_path = os.path.join(
+        _keystore.get_keystore_public_dir(keystore_path), 'identity_ca.cert.pem')
+    keystore_identity_ca_key_path = os.path.join(
+        _keystore.get_keystore_private_dir(keystore_path), 'identity_ca.key.pem')
+
+    cert_path = os.path.join(key_dir, 'cert.pem')
+    key_path = os.path.join(key_dir, 'key.pem')
+    if not os.path.isfile(cert_path) or not os.path.isfile(key_path):
+        print('creating cert and key')
+        _create_key_and_cert(
+            keystore_identity_ca_cert_path,
+            keystore_identity_ca_key_path,
+            identity,
+            cert_path,
+            key_path
+        )
+    else:
+        print('found cert and key; not creating new ones!')
+
+    # create a wildcard permissions file for this node which can be overridden
+    # later using a policy if desired
+    policy_file_path = get_policy_default('policy.xml')
+    policy_element = _policy.get_policy('/', policy_file_path)
+    context_element = policy_element.find('contexts/context')
+    context_element.attrib['path'] = identity
+
+    permissions_path = os.path.join(key_dir, 'permissions.xml')
+    _permission.create_permission_file(permissions_path, _utilities.domain_id(), policy_element)
+
+    signed_permissions_path = os.path.join(key_dir, 'permissions.p7s')
+    keystore_permissions_ca_key_path = os.path.join(
+        _keystore.get_keystore_private_dir(keystore_path), 'permissions_ca.key.pem')
+    _utilities.create_smime_signed_file(
+        keystore_ca_cert_path,
+        keystore_permissions_ca_key_path,
+        permissions_path,
+        signed_permissions_path
+    )
+
+    return True
+
+
+def list_keys(keystore_path):
+    contexts_path = _keystore.get_keystore_context_dir(keystore_path)
+    if not os.path.isdir(keystore_path):
+        raise FileNotFoundError(errno.ENOENT, os.strerror(errno.ENOENT), keystore_path)
+    if not os.path.isdir(contexts_path):
+        return True
+    for name in os.listdir(contexts_path):
+        if os.path.isdir(os.path.join(contexts_path, name)):
+            print(name)
+    return True
+
+
+def _is_key_name_valid(name):
+    # TODO(ivanpauno): Use validate_security_context_name when it's propagated to `rclpy`.
+    #   This is not to bad for the moment.
+    #   Related with https://github.com/ros2/rclpy/issues/528.
+    try:
+        return validate_namespace(name)
+    except InvalidNamespaceException as e:
+        print(e)
+        return False
+
+
+def _create_key_and_cert(
+        keystore_ca_cert_path, keystore_ca_key_path, identity, cert_path, key_path):
+    # Load the CA cert and key from disk
+    with open(keystore_ca_cert_path, 'rb') as f:
+        ca_cert = x509.load_pem_x509_certificate(f.read(), cryptography_backend())
+
+    with open(keystore_ca_key_path, 'rb') as f:
+        ca_key = serialization.load_pem_private_key(f.read(), None, cryptography_backend())
+
+    cert, private_key = _utilities.build_key_and_cert(
+        x509.Name([x509.NameAttribute(x509.oid.NameOID.COMMON_NAME, identity)]),
+        issuer_name=ca_cert.subject,
+        ca_key=ca_key)
+
+    _utilities.write_key(private_key, key_path)
+    _utilities.write_cert(cert, cert_path)

sros2/sros2/verb/create_key.py

@@ -18,7 +18,7 @@
     def DirectoriesCompleter():
         return None
 
-from sros2.api import create_key
+from sros2.api import _key
 from sros2.verb import VerbExtension
 
 
@@ -31,5 +31,5 @@ def add_arguments(self, parser, cli_name):
         parser.add_argument('NAME', help='key name, aka ROS security context name')
 
     def main(self, *, args):
-        success = create_key(args.ROOT, args.NAME)
+        success = _key.create_key(args.ROOT, args.NAME)
         return 0 if success else 1

sros2/sros2/verb/list_keys.py

@@ -20,7 +20,7 @@ def DirectoriesCompleter():
 
 import sys
 
-from sros2.api import list_keys
+from sros2.api import _key
 from sros2.verb import VerbExtension
 
 
@@ -33,7 +33,7 @@ def add_arguments(self, parser, cli_name):
 
     def main(self, *, args):
         try:
-            if list_keys(args.ROOT):
+            if _key.list_keys(args.ROOT):
                 return 0
         except FileNotFoundError as e:
             print('No such file or directory: {!r}'.format(e.filename), file=sys.stderr)

sros2/test/sros2/test_api.py → sros2/test/sros2/api/test_key.py

@@ -12,20 +12,20 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from sros2.api import is_key_name_valid
+from sros2.api import _key
 
 
 def test_is_key_name_valid():
     # Valid cases
-    assert is_key_name_valid('/foo')
-    assert is_key_name_valid('/foo/bar')
-    assert is_key_name_valid('/foo/bar123/_/baz_')
+    assert _key._is_key_name_valid('/foo')
+    assert _key._is_key_name_valid('/foo/bar')
+    assert _key._is_key_name_valid('/foo/bar123/_/baz_')
 
     # Invalid cases
-    assert not is_key_name_valid('')
-    assert not is_key_name_valid(' ')
-    assert not is_key_name_valid('//')
-    assert not is_key_name_valid('foo')
-    assert not is_key_name_valid('foo/bar')
-    assert not is_key_name_valid('/42foo')
-    assert not is_key_name_valid('/foo/42bar')
+    assert not _key._is_key_name_valid('')
+    assert not _key._is_key_name_valid(' ')
+    assert not _key._is_key_name_valid('//')
+    assert not _key._is_key_name_valid('foo')
+    assert not _key._is_key_name_valid('foo/bar')
+    assert not _key._is_key_name_valid('/42foo')
+    assert not _key._is_key_name_valid('/foo/42bar')

sros2/test/sros2/commands/security/verbs/test_list_keys.py

@@ -16,7 +16,7 @@
 import tempfile
 
 from ros2cli import cli
-from sros2.api import _keystore, create_key
+from sros2.api import _key, _keystore
 
 
 def test_list_keys(capsys):
@@ -26,7 +26,7 @@ def test_list_keys(capsys):
             assert _keystore.create_keystore(keystore_dir)
 
             # Now using that keystore, create a keypair
-            assert create_key(keystore_dir, '/test_context')
+            assert _key.create_key(keystore_dir, '/test_context')
 
         # Now verify that the key we just created is included in the list
         assert cli.main(argv=['security', 'list_keys', keystore_dir]) == 0