Add Redis ACL support [First Draft]

src/swsssdk/__init__.py

@@ -10,7 +10,9 @@
 
 if ('unittest' not in sys.modules.keys() and
         'mockredis' not in sys.modules.keys() and
-        'mock' not in sys.modules.keys()):
+        'mock' not in sys.modules.keys() and
+        'netq_agent' not in sys.modules.keys()):
+    # netq_agent temporary fix until move to swsscommon lib.
     msg = "sonic-py-swsssdk been deprecated, please switch to sonic-swss-common."
     logger.exception(msg)
     raise ImportError("sonic-py-swsssdk been deprecated, please switch to sonic-swss-common.")

src/swsssdk/interface.py

@@ -1,5 +1,6 @@
 import time
 from functools import wraps
+from . import util
 
 import redis
 from redis import RedisError
@@ -143,6 +144,8 @@ class DBInterface(object):
     ACS Redis db mainly uses hash, therefore h is selected.
     """
 
+    ACL_PW_PATH = '/etc/shadow_redis_dir/shadow_redis_admin'
+
     def __init__(self, **kwargs):
 
         super(DBInterface, self).__init__()
@@ -151,7 +154,13 @@ def __init__(self, **kwargs):
         self.redis_kwargs = kwargs
         if len(self.redis_kwargs) == 0:
             self.redis_kwargs['unix_socket_path'] = self.REDIS_UNIX_SOCKET_PATH
-
+            self.redis_kwargs['username'] = 'admin'
+            if 'password' not in self.redis_kwargs:
+                self.redis_kwargs['password'] = util.read_from_file(self.ACL_PW_PATH)
+            redis_shadow_tls_ca="/etc/shadow_redis_dir/certs_redis/ca.crt"
+            self.redis_kwargs['ssl'] = True
+            self.redis_kwargs['ssl_cert_reqs'] = None
+            self.redis_kwargs['ssl_ca_certs'] = redis_shadow_tls_ca
         # For thread safety as recommended by python-redis
         # Create a separate client for each database
         self.redis_clients = DBRegistry()

src/swsssdk/sonic_db_dump_load.py

@@ -97,6 +97,7 @@ def do_load(options, args):
         usage += "\nfrom standard input."
     parser = optparse.OptionParser(usage=usage)
     parser.add_option('-w', '--password', help='connect with PASSWORD')
+    parser.add_option('-u', '--username', help='connect with USERNAME')
     if help == DUMP:
         parser.add_option('-n', '--dbname', help='dump DATABASE (APPL_DB/ASIC_DB...)')
         parser.add_option('-t', '--conntype', help='indicate redis connection type (tcp[default] or unix_socket)', default='tcp')

src/swsssdk/util.py

@@ -65,3 +65,27 @@ def setup_logging(config_file_path, log_level=logging.INFO):
         logging.root.exception(
             "Could not load specified logging configuration '{}'. Verify the filepath exists and is compliant with: "
             "[https://docs.python.org/3/library/logging.config.html#object-connections]".format(config_file_path))
+
+
+def read_from_file(file_path, target_type=str):
+    """
+    Read content from file and convert to target type
+    :param file_path: File path
+    :param target_type: target type
+    :return: content of the file according the target type.
+    """
+    value = None
+    try:
+        with open(file_path, 'r') as f:
+            value = f.read()
+            if value is None:
+                # None return value is not allowed in any case, so we log error here for further debug.
+                logging.error('Failed to read from {}, value is None, errno is {}'.format(file_path, ctypes.get_errno()))
+                # Raise ValueError for the except statement to handle this as a normal exception
+                raise ValueError('File content of {} is None'.format(file_path))
+            else:
+                value = target_type(value.strip())
+    except (ValueError, IOError) as e:
+        logging.error('Failed to read from {}, errno is {}'.format(file_path, str(e)))
+
+    return value