http: T5762: api: make API socket backend communication the one and only default

Why: Smoketests fail as they can not establish IPv6 connection to uvicorn
backend server.

https://github.com/vyos/vyos-1x/pull/2481 added a bunch of new smoketests.

While debugging those failing, it was uncovered, that uvicorn only listens on
IPv4 connections

vyos@vyos# netstat -tulnp | grep 8080
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp        0      0 127.0.0.1:8080          0.0.0.0:*               LISTEN      -

As the CLI already has an option to move the API communication from an IP to a
UNIX domain socket, the best idea is to make this the default way of
communication, as we never directly talk to the API server but rather use the
NGINX reverse proxy.

(cherry picked from commit f5e43b1361fb59a9c260739bdb28729d5119507c)

10 files changed, 158 insertions, 43 deletions

diff --git a/data/templates/https/nginx.default.j2 b/data/templates/https/nginx.default.j2
index b541ff309..468640b4b 100644
--- a/data/templates/https/nginx.default.j2
+++ b/data/templates/https/nginx.default.j2
@@ -38,11 +38,7 @@ server {
         # proxy settings for HTTP API, if enabled; 503, if not
         location ~ ^/(retrieve|configure|config-file|image|container-image|generate|show|reset|docs|openapi.json|redoc|graphql) {
 {%     if server.api %}
-{%         if server.api.socket %}
                 proxy_pass http://unix:/run/api.sock;
-{%         else %}
-                proxy_pass http://localhost:{{ server.api.port }};
-{%         endif %}
                 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                 proxy_set_header X-Forwarded-Proto $scheme;
                 proxy_read_timeout 600;
diff --git a/interface-definitions/https.xml.in b/interface-definitions/https.xml.in
index 5430193b5..448075b5b 100644
--- a/interface-definitions/https.xml.in
+++ b/interface-definitions/https.xml.in
@@ -68,7 +68,6 @@
               <priority>1002</priority>
             </properties>
             <children>
-              #include <include/port-number.xml.i>
               <node name="keys">
                 <properties>
                   <help>HTTP API keys</help>
@@ -101,12 +100,6 @@
                   <hidden/>
                 </properties>
               </leafNode>
-              <leafNode name="socket">
-                <properties>
-                  <help>Run server on Unix domain socket</help>
-                  <valueless/>
-                </properties>
-              </leafNode>
               <node name="graphql">
                 <properties>
                   <help>GraphQL support</help>
diff --git a/interface-definitions/include/version/https-version.xml.i b/interface-definitions/include/version/https-version.xml.i
index 111076974..fa18278f3 100644
--- a/interface-definitions/include/version/https-version.xml.i
+++ b/interface-definitions/include/version/https-version.xml.i
@@ -1,3 +1,3 @@
 <!-- include start from include/version/https-version.xml.i -->
-<syntaxVersion component='https' version='4'></syntaxVersion>
+<syntaxVersion component='https' version='5'></syntaxVersion>
 <!-- include end -->
diff --git a/smoketest/config-tests/basic-api-service b/smoketest/config-tests/basic-api-service
new file mode 100644
index 000000000..d78062402
--- /dev/null
+++ b/smoketest/config-tests/basic-api-service
@@ -0,0 +1,12 @@
+set interfaces ethernet eth0 address '192.0.2.1/31'
+set interfaces ethernet eth0 address '2001:db8::1234/64'
+set interfaces loopback lo
+set service ntp server time1.vyos.net
+set service ntp server time2.vyos.net
+set service ntp server time3.vyos.net
+set service https api keys id 1 key 'S3cur3'
+set system config-management commit-revisions '100'
+set system host-name 'vyos'
+set system login user vyos authentication encrypted-password '$6$2Ta6TWHd/U$NmrX0x9kexCimeOcYK1MfhMpITF9ELxHcaBU/znBq.X2ukQOj61fVI2UYP/xBzP4QtiTcdkgs7WOQMHWsRymO/'
+set system login user vyos authentication plaintext-password ''
+set system console device ttyS0 speed '115200'
diff --git a/smoketest/configs/basic-api-service b/smoketest/configs/basic-api-service
new file mode 100644
index 000000000..98b2ebcf8
--- /dev/null
+++ b/smoketest/configs/basic-api-service
@@ -0,0 +1,66 @@
+interfaces {
+    ethernet eth0 {
+        address 192.0.2.1/31
+        address 2001:db8::1234/64
+    }
+    ethernet eth1 {
+    }
+    loopback lo {
+    }
+}
+service {
+    https {
+        api {
+            keys {
+                id 1 {
+                    key S3cur3
+                }
+            }
+            socket
+        }
+    }
+    ssh {
+    }
+}
+system {
+    config-management {
+        commit-revisions 100
+    }
+    console {
+        device ttyS0 {
+            speed 115200
+        }
+    }
+    host-name vyos
+    login {
+        user vyos {
+            authentication {
+                encrypted-password $6$2Ta6TWHd/U$NmrX0x9kexCimeOcYK1MfhMpITF9ELxHcaBU/znBq.X2ukQOj61fVI2UYP/xBzP4QtiTcdkgs7WOQMHWsRymO/
+                plaintext-password ""
+            }
+        }
+    }
+    ntp {
+        server time1.vyos.net {
+        }
+        server time2.vyos.net {
+        }
+        server time3.vyos.net {
+        }
+    }
+    syslog {
+        global {
+            facility all {
+                level info
+            }
+            facility protocols {
+                level debug
+            }
+        }
+    }
+}
+
+
+// Warning: Do not remove the following line.
+// vyos-config-version: "broadcast-relay@1:cluster@1:config-management@1:conntrack@1:conntrack-sync@1:dhcp-relay@2:dhcp-server@5:dhcpv6-server@1:dns-forwarding@3:firewall@5:https@2:interfaces@13:ipoe-server@1:ipsec@5:l2tp@3:lldp@1:mdns@1:nat@5:ntp@1:pppoe-server@5:pptp@2:qos@1:quagga@6:salt@1:snmp@2:ssh@2:sstp@3:system@19:vrrp@2:vyos-accel-ppp@2:wanloadbalance@3:webgui@1:webproxy@2:zone-policy@1"
+// Release version: 1.3-rolling-202010241631
diff --git a/smoketest/scripts/cli/test_service_https.py b/smoketest/scripts/cli/test_service_https.py
index a18e7dfac..4da85fadf 100755
--- a/smoketest/scripts/cli/test_service_https.py
+++ b/smoketest/scripts/cli/test_service_https.py
@@ -23,7 +23,7 @@ from urllib3.exceptions import InsecureRequestWarning
 from base_vyostest_shim import VyOSUnitTestSHIM
 from base_vyostest_shim import ignore_warning
 from vyos.utils.file import read_file
-from vyos.utils.process import run
+from vyos.utils.process import process_named_running
 
 base_path = ['service', 'https']
 pki_base = ['pki']
@@ -49,24 +49,28 @@ MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgPLpD0Ohhoq0g4nhx
 u8/3jHMM7sDwL3aWzW/zp54/LhCWUoLMjDdDEEigK4fal4ZF9aA9F0Ww
 """
 
+PROCESS_NAME = 'nginx'
+
 class TestHTTPSService(VyOSUnitTestSHIM.TestCase):
-    def setUp(self):
+    @classmethod
+    def setUpClass(cls):
+        super(TestHTTPSService, cls).setUpClass()
+
         # ensure we can also run this test on a live system - so lets clean
         # out the current configuration :)
-        self.cli_delete(base_path)
-        self.cli_delete(pki_base)
+        cls.cli_delete(cls, base_path)
+        cls.cli_delete(cls, pki_base)
 
     def tearDown(self):
+        # Check for running process
+        self.assertTrue(process_named_running(PROCESS_NAME))
+
         self.cli_delete(base_path)
         self.cli_delete(pki_base)
         self.cli_commit()
 
-    def test_default(self):
-        self.cli_set(base_path)
-        self.cli_commit()
-
-        ret = run('sudo /usr/sbin/nginx -t')
-        self.assertEqual(ret, 0)
+        # Check for stopped  process
+        self.assertFalse(process_named_running(PROCESS_NAME))
 
     def test_server_block(self):
         vhost_id = 'example'
@@ -82,9 +86,6 @@ class TestHTTPSService(VyOSUnitTestSHIM.TestCase):
 
         self.cli_commit()
 
-        ret = run('sudo /usr/sbin/nginx -t')
-        self.assertEqual(ret, 0)
-
         nginx_config = read_file('/etc/nginx/sites-enabled/default')
         self.assertIn(f'listen {address}:{port} ssl;', nginx_config)
         self.assertIn(f'ssl_protocols TLSv1.2 TLSv1.3;', nginx_config)
@@ -97,9 +98,6 @@ class TestHTTPSService(VyOSUnitTestSHIM.TestCase):
 
         self.cli_commit()
 
-        ret = run('sudo /usr/sbin/nginx -t')
-        self.assertEqual(ret, 0)
-
     @ignore_warning(InsecureRequestWarning)
     def test_api_auth(self):
         vhost_id = 'example'
@@ -107,7 +105,6 @@ class TestHTTPSService(VyOSUnitTestSHIM.TestCase):
         port = '443'
         name = 'localhost'
 
-        self.cli_set(base_path + ['api', 'socket'])
         key = 'MySuperSecretVyOS'
         self.cli_set(base_path + ['api', 'keys', 'id', 'key-01', 'key', key])
 
diff --git a/src/conf_mode/https.py b/src/conf_mode/https.py
index 010490c7e..028a5007a 100755
--- a/src/conf_mode/https.py
+++ b/src/conf_mode/https.py
@@ -215,14 +215,9 @@ def generate(https):
         api_data = vyos.defaults.api_data
     api_settings = https.get('api', {})
     if api_settings:
-        port = api_settings.get('port', '')
-        if port:
-            api_data['port'] = port
         vhosts = https.get('api-restrict', {}).get('virtual-host', [])
         if vhosts:
             api_data['vhost'] = vhosts[:]
-        if 'socket' in list(api_settings):
-            api_data['socket'] = True
 
     if api_data:
         vhost_list = api_data.get('vhost', [])
diff --git a/src/etc/sysctl.d/30-vyos-router.conf b/src/etc/sysctl.d/30-vyos-router.conf
index 1c9b8999f..67d96969e 100644
--- a/src/etc/sysctl.d/30-vyos-router.conf
+++ b/src/etc/sysctl.d/30-vyos-router.conf
@@ -105,3 +105,11 @@ net.core.rps_sock_flow_entries = 32768
 net.core.default_qdisc=fq_codel
 net.ipv4.tcp_congestion_control=bbr
 
+# VRF - Virtual routing and forwarding
+# When net.vrf.strict_mode=0 (default) it is possible to associate multiple
+# VRF devices to the same table. Conversely, when net.vrf.strict_mode=1 a
+# table can be associated to a single VRF device.
+#
+# A VRF table can be used by the VyOS CLI only once (ensured by verify()),
+# this simply adds an additional Kernel safety net
+net.vrf.strict_mode=1
diff --git a/src/migration-scripts/https/4-to-5 b/src/migration-scripts/https/4-to-5
new file mode 100755
index 000000000..a503e0cb7
--- /dev/null
+++ b/src/migration-scripts/https/4-to-5
@@ -0,0 +1,56 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2023 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# T5762: http: api: smoketests fail as they can not establish IPv6 connection
+#        to uvicorn backend server, always make the UNIX domain socket the
+#        default way of communication
+
+import sys
+
+from vyos.configtree import ConfigTree
+
+if len(sys.argv) < 2:
+    print("Must specify file name!")
+    sys.exit(1)
+
+file_name = sys.argv[1]
+
+with open(file_name, 'r') as f:
+    config_file = f.read()
+
+config = ConfigTree(config_file)
+
+base = ['service', 'https']
+if not config.exists(base):
+    # Nothing to do
+    sys.exit(0)
+
+# Delete "socket" CLI option - we always use UNIX domain sockets for
+# NGINX <-> API server communication
+if config.exists(base + ['api', 'socket']):
+    config.delete(base + ['api', 'socket'])
+
+# There is no need for an API service port, as UNIX domain sockets
+# are used
+if config.exists(base + ['api', 'port']):
+    config.delete(base + ['api', 'port'])
+
+try:
+    with open(file_name, 'w') as f:
+        f.write(config.to_string())
+except OSError as e:
+    print("Failed to save the modified config: {}".format(e))
+    sys.exit(1)
diff --git a/src/services/vyos-http-api-server b/src/services/vyos-http-api-server
index 3a9efb73e..daee24257 100755
--- a/src/services/vyos-http-api-server
+++ b/src/services/vyos-http-api-server
@@ -825,15 +825,7 @@ def initialization(session: ConfigSession, app: FastAPI = app):
     if app.state.vyos_graphql:
         graphql_init(app)
 
-    if not server_config['socket']:
-        config = ApiServerConfig(app,
-                                 host=server_config["listen_address"],
-                                 port=int(server_config["port"]),
-                                 proxy_headers=True)
-    else:
-        config = ApiServerConfig(app,
-                                 uds="/run/api.sock",
-                                 proxy_headers=True)
+    config = ApiServerConfig(app, uds="/run/api.sock", proxy_headers=True)
     server = ApiServer(config)
 
 def run_server():