Add keystone audit middleware API logging

This commit adds Keystone audit middleware API logging to the Cinder
charm in versions Yoga and newer to allow users to configure their
environment for CADF compliance. This feature can be enabled/disabled
and is set to 'disabled' by default to avoid bloat in log files.
The logging output is configured to /var/log/apache2/cinder_error.log.
This commit builds on previous discussions:
juju/charm-helpers#808.

Related-Pr: juju/charm-helpers#893
func-test-pr: openstack-charmers/zaza-openstack-tests#1200
Closes-Bug: 1856555
Change-Id: Ia7dbd6af2305e92eaa9a65890644c4a324ab2c65

charmhelpers/contrib/network/ip.py

@@ -16,6 +16,7 @@
 import re
 import subprocess
 import socket
+import ssl
 
 from functools import partial
 
@@ -527,19 +528,56 @@ def get_hostname(address, fqdn=True):
         return result.split('.')[0]
 
 
-def port_has_listener(address, port):
+class SSLPortCheckInfo(object):
+
+    def __init__(self, key, cert, ca_cert, check_hostname=False):
+        self.key = key
+        self.cert = cert
+        self.ca_cert = ca_cert
+        # NOTE: by default we do not check hostname since the port check is
+        #       typically performed using 0.0.0.0 which will not match the
+        #       certificate. Hence the default for this is False.
+        self.check_hostname = check_hostname
+
+    @property
+    def ssl_context(self):
+        context = ssl.create_default_context()
+        context.check_hostname = self.check_hostname
+        context.load_cert_chain(self.cert, self.key)
+        context.load_verify_locations(self.ca_cert)
+        return context
+
+
+def port_has_listener(address, port, sslinfo=None):
     """
     Returns True if the address:port is open and being listened to,
-    else False.
+    else False. By default uses netcat to check ports but if sslinfo is
+    provided will use an SSL connection instead.
 
     @param address: an IP address or hostname
     @param port: integer port
+    @param sslinfo: optional SSLPortCheckInfo object.
+                    If provided, the check is performed using an ssl
+                    connection.
 
     Note calls 'zc' via a subprocess shell
     """
-    cmd = ['nc', '-z', address, str(port)]
-    result = subprocess.call(cmd)
-    return not (bool(result))
+    if not sslinfo:
+        cmd = ['nc', '-z', address, str(port)]
+        result = subprocess.call(cmd)
+        return not (bool(result))
+
+    try:
+        with socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0) as sock:
+            ssock = sslinfo.ssl_context.wrap_socket(sock,
+                                                    server_hostname=address)
+            ssock.connect((address, port))
+            # this bit is crucial to ensure tls close_notify is sent
+            ssock.unwrap()
+
+        return True
+    except ConnectionRefusedError:
+        return False
 
 
 def assert_charm_supports_ipv6():

charmhelpers/contrib/openstack/context.py

@@ -202,6 +202,21 @@ def get_related(self):
             return self.related
 
 
+class KeystoneAuditMiddleware(OSContextGenerator):
+    def __init__(self, service: str) -> None:
+        self.service_name = service
+
+    def __call__(self):
+        """Return context dictionary containing configuration status of
+        audit-middleware and the charm service name.
+        """
+        ctxt = {
+            'audit_middleware': config('audit-middleware') or False,
+            'service_name': self.service_name
+        }
+        return ctxt
+
+
 class SharedDBContext(OSContextGenerator):
     interfaces = ['shared-db']
 

charmhelpers/contrib/openstack/templates/section-audit-middleware-notifications

@@ -0,0 +1,4 @@
+{% if audit_middleware -%}
+[audit_middleware_notifications]
+driver = log
+{% endif -%}

charmhelpers/contrib/openstack/templates/section-filter-audit

@@ -0,0 +1,6 @@
+{% if audit_middleware and service_name -%}
+[filter:audit]
+paste.filter_factory = keystonemiddleware.audit:filter_factory
+audit_map_file = /etc/{{ service_name }}/api_audit_map.conf
+service_name = {{ service_name }}
+{% endif -%}

charmhelpers/contrib/openstack/utils.py

@@ -1207,12 +1207,14 @@ def _ows_check_services_running(services, ports):
     return ows_check_services_running(services, ports)
 
 
-def ows_check_services_running(services, ports):
+def ows_check_services_running(services, ports, ssl_check_info=None):
     """Check that the services that should be running are actually running
     and that any ports specified are being listened to.
 
     @param services: list of strings OR dictionary specifying services/ports
     @param ports: list of ports
+    @param ssl_check_info: SSLPortCheckInfo object. If provided, port checks
+                           will be done using an SSL connection.
     @returns state, message: strings or None, None
     """
     messages = []
@@ -1228,7 +1230,7 @@ def ows_check_services_running(services, ports):
         # also verify that the ports that should be open are open
         # NB, that ServiceManager objects only OPTIONALLY have ports
         map_not_open, ports_open = (
-            _check_listening_on_services_ports(services))
+            _check_listening_on_services_ports(services, ssl_check_info))
         if not all(ports_open):
             # find which service has missing ports. They are in service
             # order which makes it a bit easier.
@@ -1243,7 +1245,8 @@ def ows_check_services_running(services, ports):
 
     if ports is not None:
         # and we can also check ports which we don't know the service for
-        ports_open, ports_open_bools = _check_listening_on_ports_list(ports)
+        ports_open, ports_open_bools = \
+            _check_listening_on_ports_list(ports, ssl_check_info)
         if not all(ports_open_bools):
             messages.append(
                 "Ports which should be open, but are not: {}"
@@ -1302,7 +1305,8 @@ def _check_running_services(services):
     return list(zip(services, services_running)), services_running
 
 
-def _check_listening_on_services_ports(services, test=False):
+def _check_listening_on_services_ports(services, test=False,
+                                       ssl_check_info=None):
     """Check that the unit is actually listening (has the port open) on the
     ports that the service specifies are open. If test is True then the
     function returns the services with ports that are open rather than
@@ -1312,11 +1316,14 @@ def _check_listening_on_services_ports(services, test=False):
 
     @param services: OrderedDict(service: [port, ...], ...)
     @param test: default=False, if False, test for closed, otherwise open.
+    @param ssl_check_info: SSLPortCheckInfo object. If provided, port checks
+                           will be done using an SSL connection.
     @returns OrderedDict(service: [port-not-open, ...]...), [boolean]
     """
     test = not (not (test))  # ensure test is True or False
     all_ports = list(itertools.chain(*services.values()))
-    ports_states = [port_has_listener('0.0.0.0', p) for p in all_ports]
+    ports_states = [port_has_listener('0.0.0.0', p, ssl_check_info)
+                    for p in all_ports]
     map_ports = OrderedDict()
     matched_ports = [p for p, opened in zip(all_ports, ports_states)
                      if opened == test]  # essentially opened xor test
@@ -1327,16 +1334,19 @@ def _check_listening_on_services_ports(services, test=False):
     return map_ports, ports_states
 
 
-def _check_listening_on_ports_list(ports):
+def _check_listening_on_ports_list(ports, ssl_check_info=None):
     """Check that the ports list given are being listened to
 
     Returns a list of ports being listened to and a list of the
     booleans.
 
+    @param ssl_check_info: SSLPortCheckInfo object. If provided, port checks
+                           will be done using an SSL connection.
     @param ports: LIST of port numbers.
     @returns [(port_num, boolean), ...], [boolean]
     """
-    ports_open = [port_has_listener('0.0.0.0', p) for p in ports]
+    ports_open = [port_has_listener('0.0.0.0', p, ssl_check_info)
+                  for p in ports]
     return zip(ports, ports_open), ports_open
 
 

charmhelpers/contrib/storage/linux/lvm.py

@@ -17,8 +17,6 @@
     CalledProcessError,
     check_call,
     check_output,
-    Popen,
-    PIPE,
 )
 
 
@@ -58,9 +56,7 @@ def remove_lvm_physical_volume(block_device):
 
     :param block_device: str: Full path of block device to scrub.
     '''
-    p = Popen(['pvremove', '-ff', block_device],
-              stdin=PIPE)
-    p.communicate(input='y\n')
+    check_call(['pvremove', '-ff', '--yes', block_device])
 
 
 def list_lvm_volume_group(block_device):

charmhelpers/core/host.py

@@ -256,8 +256,11 @@ def service_resume(service_name, init_dir="/etc/init",
     upstart_file = os.path.join(init_dir, "{}.conf".format(service_name))
     sysv_file = os.path.join(initd_dir, service_name)
     if init_is_systemd(service_name=service_name):
-        service('unmask', service_name)
-        service('enable', service_name)
+        if service('is-enabled', service_name):
+            log('service {} already enabled'.format(service_name), level=DEBUG)
+        else:
+            service('unmask', service_name)
+            service('enable', service_name)
     elif os.path.exists(upstart_file):
         override_path = os.path.join(
             init_dir, '{}.override'.format(service_name))

charmhelpers/osplatform.py

@@ -9,19 +9,13 @@ def get_platform():
     will be returned (which is the name of the module).
     This string is used to decide which platform module should be imported.
     """
-    # linux_distribution is deprecated and will be removed in Python 3.7
-    # Warnings *not* disabled, as we certainly need to fix this.
-    if hasattr(platform, 'linux_distribution'):
-        tuple_platform = platform.linux_distribution()
-        current_platform = tuple_platform[0]
-    else:
-        current_platform = _get_platform_from_fs()
+    current_platform = _get_current_platform()
 
     if "Ubuntu" in current_platform:
         return "ubuntu"
     elif "CentOS" in current_platform:
         return "centos"
-    elif "debian" in current_platform:
+    elif "debian" in current_platform or "Debian" in current_platform:
         # Stock Python does not detect Ubuntu and instead returns debian.
         # Or at least it does in some build environments like Travis CI
         return "ubuntu"
@@ -36,6 +30,24 @@ def get_platform():
                            .format(current_platform))
 
 
+def _get_current_platform():
+    """Return the current platform information for the OS.
+
+    Attempts to lookup linux distribution information from the platform
+    module for releases of python < 3.7. For newer versions of python,
+    the platform is determined from the /etc/os-release file.
+    """
+    # linux_distribution is deprecated and will be removed in Python 3.7
+    # Warnings *not* disabled, as we certainly need to fix this.
+    if hasattr(platform, 'linux_distribution'):
+        tuple_platform = platform.linux_distribution()
+        current_platform = tuple_platform[0]
+    else:
+        current_platform = _get_platform_from_fs()
+
+    return current_platform
+
+
 def _get_platform_from_fs():
     """Get Platform from /etc/os-release."""
     with open(os.path.join(os.sep, 'etc', 'os-release')) as fin:

config.yaml

@@ -12,6 +12,11 @@ options:
     default: False
     description: |
       Setting this to True will allow supporting services to log to syslog.
+  audit-middleware:
+    type: boolean
+    default: False
+    description: |
+      Enable Keystone auditing middleware for logging API calls.
   openstack-origin:
     type: string
     default: bobcat

hooks/cinder_utils.py

@@ -167,6 +167,7 @@ class CinderCharmError(Exception):
 CINDER_CONF = '%s/cinder.conf' % CINDER_CONF_DIR
 CINDER_API_CONF = '%s/api-paste.ini' % CINDER_CONF_DIR
 CINDER_POLICY_JSON = '%s/policy.json' % CINDER_CONF_DIR
+CINDER_AUDIT_MAP = '%s/api_audit_map.conf' % CINDER_CONF_DIR
 CEPH_CONF = '/etc/ceph/ceph.conf'
 
 HAPROXY_CONF = '/etc/haproxy/haproxy.cfg'
@@ -237,18 +238,24 @@ def required_interfaces():
                      cinder_contexts.VolumeUsageAuditContext(),
                      context.MemcacheContext(),
                      cinder_contexts.SectionalConfigContext(),
-                     cinder_contexts.LVMContext()],
+                     cinder_contexts.LVMContext(),
+                     context.KeystoneAuditMiddleware(service='cinder')],
         'services': ['cinder-api', 'cinder-volume', 'cinder-scheduler',
                      'haproxy']
     }),
     (CINDER_API_CONF, {
-        'contexts': [context.IdentityServiceContext()],
+        'contexts': [context.IdentityServiceContext(),
+                     context.KeystoneAuditMiddleware(service='cinder')],
         'services': ['cinder-api'],
     }),
     (CINDER_POLICY_JSON, {
         'contexts': [],
         'services': ['cinder-api']
     }),
+    (CINDER_AUDIT_MAP, {
+        'contexts': [context.KeystoneAuditMiddleware(service='cinder')],
+        'services': ['cinder-api']
+    }),
     (ceph_config_file(), {
         'contexts': [context.CephContext()],
         'services': ['cinder-volume']
@@ -773,7 +780,7 @@ def check_local_db_actions_complete():
             # Echo notification
             data = {CINDER_DB_INIT_ECHO_RKEY: init_id}
             # BUG: #1928383 - clear CINDER_DB_INIT_RKEY if not the leader
-            if not(is_elected_leader(CLUSTER_RES)):
+            if not is_elected_leader(CLUSTER_RES):
                 data[CINDER_DB_INIT_RKEY] = None
             relation_set(**data)