[ycabled] add support for getting grpc secerts via shared file (#298)

This PR adds support for adding the secrets to grpc client in active-active configuration via a shared file
/etc/sonic/grpc_secrets.json.
Using this file, secrets configuration in populated inside CONFIG_DB,
absence of this file will assume insecure gRPC client.

Description
Motivation and Context
How Has This Been Tested?
testing with UT and putting the changes on Arista testbed

Signed-off-by: vaibhav-dahiya vdahiya@microsoft.com

sonic-ycabled/tests/test_y_cable_helper.py

@@ -10,9 +10,9 @@
 import time
 
 if sys.version_info >= (3, 3):
-    from unittest.mock import MagicMock, patch
+    from unittest.mock import MagicMock, patch, mock_open
 else:
-    from mock import MagicMock, patch
+    from mock import MagicMock, patch, mock_open
 
 
 daemon_base.db_connect = MagicMock()
@@ -5458,6 +5458,7 @@ def test_get_mux_cable_static_info_without_presence(self):
         assert(rc['nic_lane1_postcursor1'] == 'N/A')
         assert(rc['nic_lane1_postcursor2'] == 'N/A')
 
+    @patch('os.path.isfile', MagicMock(return_value=True))
     def test_get_grpc_credentials(self):
 
         kvp = {}
@@ -5469,6 +5470,7 @@ def test_get_grpc_credentials(self):
 
 
     @patch('builtins.open')
+    @patch('os.path.isfile', MagicMock(return_value=True))
     def test_get_grpc_credentials_root(self, open):
 
         kvp = {"ca_crt": "file"}
@@ -5498,3 +5500,17 @@ def test_handle_ycable_enable_disable_tel_notification_probe(self):
         fvp_m = {"log_verbosity": "debug"}
         rc = handle_ycable_enable_disable_tel_notification(fvp_m, "Y_CABLE")
         assert(rc == None)
+
+
+    @patch('builtins.open')
+    def test_apply_grpc_secrets_configuration(self, open):
+
+        parsed_data = {'GRPCCLIENT': {'config': {'type': 'secure', 'auth_level': 'server', 'log_level': 'info'}, 'certs': {'client_crt': 'one.crt', 'client_key': 'one.key', 'ca_crt': 'ss.crt', 'grpc_ssl_credential': 'jj.tsl'}}}
+
+        mock_file = MagicMock()
+        open.return_value = mock_file
+        #json_load.return_value = parsed_data
+        with patch('json.load') as patched_util:
+            patched_util.return_value = parsed_data
+            rc = apply_grpc_secrets_configuration(None)
+            assert(rc == None)

sonic-ycabled/ycable/ycable_utilities/y_cable_helper.py

@@ -5,6 +5,7 @@
 
 import datetime
 import ipaddress
+import json
 import os
 import re
 import sys
@@ -115,6 +116,8 @@
   PORT_INSTANCE_ERROR
 }
 
+SECRETS_PATH = "/etc/sonic/grpc_secrets.json"
+
 def format_mapping_identifier(string):
     """
     Takes an arbitrary string and creates a valid entity for port mapping file.
@@ -369,26 +372,64 @@ def retry_setup_grpc_channel_for_port(port, asic_index):
                 grpc_port_stubs[port] = stub
                 return True
 
+def apply_grpc_secrets_configuration(SECRETS_PATH):
+
+
+    f = open(SECRETS_PATH, 'rb')
+    parsed_data = json.load(f)
+
+    config_db, grpc_config = {}, {}
+    namespaces = multi_asic.get_front_end_namespaces()
+    for namespace in namespaces:
+        asic_id = multi_asic.get_asic_index_from_namespace(namespace)
+        config_db[asic_id] = daemon_base.db_connect("CONFIG_DB", namespace)
+        grpc_config[asic_id] = swsscommon.Table(config_db[asic_id], "GRPCCLIENT")
+
+
+    asic_index = multi_asic.get_asic_index_from_namespace(DEFAULT_NAMESPACE)
+    grpc_client_config = parsed_data.get("GRPCCLIENT", None)
+    if grpc_client_config is not None:
+        config = grpc_client_config.get("config", None)
+        if config is not None:
+            type = config.get("type",None)
+            auth_level = config.get("auth_level",None)
+            log_level = config.get("log_level", None)
+            fvs_updated = swsscommon.FieldValuePairs([('type', type),
+                                                      ('auth_level',auth_level ),
+                                                      ('log_level',log_level)])
+            grpc_config[asic_index].set('config', fvs_updated)
+        certs = grpc_client_config.get("certs", None)
+        if certs is not None:
+            client_crt = certs.get("client_crt", None)
+            client_key = certs.get("client_key", None)
+            ca_crt = certs.get("ca_crt", None)
+            grpc_ssl_credential = certs.get("grpc_ssl_credential",None)
+            fvs_updated = swsscommon.FieldValuePairs([('client_crt', client_crt),
+                                                      ('client_key', client_key),
+                                                      ('grpc_ssl_credential', grpc_ssl_credential),
+                                                      ('ca_crt',ca_crt)])
+            grpc_config[asic_index].set('certs', fvs_updated)
+
 
 def get_grpc_credentials(type, kvp):
 
     root_file = kvp.get("ca_crt", None)
-    if root_file is not None: 
+    if root_file is not None and os.path.isfile(root_file): 
         root_cert = open(root_file, 'rb').read()
     else:
         helper_logger.log_error("grpc credential channel setup no root file in config_db")
         return None
 
     if type == "mutual":
         cert_file = kvp.get("client_crt", None)
-        if cert_file is not None: 
+        if cert_file is not None and os.path.isfile(cert_file): 
             cert_chain = open(cert_file, 'rb').read()
         else:
             helper_logger.log_error("grpc credential channel setup no cert file for mutual authentication in config_db")
             return None
 
         key_file = kvp.get("client_key", None)
-        if key_file is not None: 
+        if key_file is not None and os.path.isfile(key_file): 
             key = open(key_file, 'rb').read()
         else:
             helper_logger.log_error("grpc credential channel setup no key file for mutual authentication in config_db")
@@ -695,6 +736,8 @@ def setup_grpc_channels(stop_event):
 
     if read_side == -1:
         read_side = process_loopback_interface_and_get_read_side(loopback_keys)
+        if os.path.isfile(SECRETS_PATH):
+            apply_grpc_secrets_configuration(SECRETS_PATH)
 
     helper_logger.log_debug("Y_CABLE_DEBUG:while setting up grpc channels read side = {}".format(read_side))
 
@@ -1377,6 +1420,8 @@ def init_ports_status_for_y_cable(platform_sfp, platform_chassis, y_cable_presen
 
     if read_side == -1:
         read_side = process_loopback_interface_and_get_read_side(loopback_keys)
+        if os.path.isfile(SECRETS_PATH):
+            apply_grpc_secrets_configuration(SECRETS_PATH)
 
     # Init PORT_STATUS table if ports are on Y cable
     logical_port_list = y_cable_platform_sfputil.logical
@@ -1439,6 +1484,8 @@ def change_ports_status_for_y_cable_change_event(port_dict, y_cable_presence, st
 
     if read_side == -1:
         read_side = process_loopback_interface_and_get_read_side(loopback_keys)
+        if os.path.isfile(SECRETS_PATH):
+            apply_grpc_secrets_configuration(SECRETS_PATH)
 
 
     # Init PORT_STATUS table if ports are on Y cable and an event is received
@@ -1500,6 +1547,7 @@ def delete_ports_status_for_y_cable():
     state_db, config_db, port_tbl, y_cable_tbl = {}, {}, {}, {}
     y_cable_tbl_keys = {}
     static_tbl, mux_tbl = {}, {}
+    grpc_config = {}
     namespaces = multi_asic.get_front_end_namespaces()
     for namespace in namespaces:
         asic_id = multi_asic.get_asic_index_from_namespace(namespace)
@@ -1513,6 +1561,14 @@ def delete_ports_status_for_y_cable():
         mux_tbl[asic_id] = swsscommon.Table(
             state_db[asic_id], MUX_CABLE_INFO_TABLE)
         port_tbl[asic_id] = swsscommon.Table(config_db[asic_id], "MUX_CABLE")
+        grpc_config[asic_id] = swsscommon.Table(config_db[asic_id], "GRPCCLIENT")
+
+
+    if read_side != -1:
+        asic_index = multi_asic.get_asic_index_from_namespace(DEFAULT_NAMESPACE)
+        if os.path.isfile(SECRETS_PATH):
+            grpc_config[asic_index]._del("config")
+            grpc_config[asic_index]._del("certs")
 
     # delete PORTS on Y cable table if ports on Y cable
     logical_port_list = y_cable_platform_sfputil.logical