Firstsawyou commented on a change in pull request #4034:
URL: https://github.com/apache/apisix/pull/4034#discussion_r612110910



##########
File path: docs/en/latest/admin-api.md
##########
@@ -784,6 +784,8 @@ Return response from etcd currently.
 | key         | True     | Private key             | https private key         
                                                                                
                                                 |                              
                    |
 | certs       | False    | An array of certificate | when you need to 
configure multiple certificate for the same domain, you can pass extra https 
certificates (excluding the one given as cert) in this field |                  
                                |
 | keys        | False    | An array of private key | https private keys. The 
keys should be paired with certs above                                          
                                                   |                            
                      |
+| client.ca | False | Certificate| set the CA certificate which will use to 
verify client. This feature requires OpenResty 1.19+.                           
                                 |                                              
    |
+| client.depth | False | Certificate| set the verification depth in the client 
certificates chain, default to 1. This feature requires OpenResty 1.19+.        
                                                    |                           
                       |

Review comment:
       The first letter should be capitalized.  set --> Set
   ```
   set the CA certificate which will use to verify client.
   ```

##########
File path: t/node/client-mtls.t
##########
@@ -0,0 +1,310 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+#
+use t::APISIX;
+
+my $nginx_binary = $ENV{'TEST_NGINX_BINARY'} || 'nginx';
+my $version = eval { `$nginx_binary -V 2>&1` };
+
+if ($version !~ m/\/apisix-nginx-module/) {
+    plan(skip_all => "apisix-nginx-module not installed");
+} else {
+    plan('no_plan');
+}
+
+repeat_each(1);
+log_level('info');
+no_root_location();
+no_shuffle();
+
+add_block_preprocessor(sub {
+    my ($block) = @_;
+
+    if ((!defined $block->error_log) && (!defined $block->no_error_log)) {
+        $block->set_value("no_error_log", "[error]");
+    }
+});
+
+run_tests();
+
+__DATA__
+
+=== TEST 1: bad client certificate
+--- config
+    location /t {
+        content_by_lua_block {
+            local t = require("lib.test_admin")
+            local json = require("toolkit.json")
+            local ssl_cert = t.read_file("t/certs/mtls_client.crt")
+            local ssl_key = t.read_file("t/certs/mtls_client.key")
+            local data = {
+                cert = ssl_cert,
+                key = ssl_key,
+                sni = "test.com",
+                client = {
+                    ca = ("test.com"):rep(128),
+                }
+            }
+            local code, body = t.test('/apisix/admin/ssl/1',
+                ngx.HTTP_PUT,
+                json.encode(data)
+            )
+
+            if code >= 300 then
+                ngx.status = code
+            end
+            ngx.print(body)
+        }
+    }
+--- request
+GET /t
+--- error_code: 400
+--- response_body
+{"error_msg":"failed to validate client_cert: failed to parse cert: 
PEM_read_bio_X509_AUX() failed"}
+
+
+
+=== TEST 2: missing client certificate
+--- config
+    location /t {
+        content_by_lua_block {
+            local t = require("lib.test_admin")
+            local json = require("toolkit.json")
+            local ssl_cert = t.read_file("t/certs/mtls_client.crt")
+            local ssl_key = t.read_file("t/certs/mtls_client.key")
+            local data = {
+                cert = ssl_cert,
+                key = ssl_key,
+                sni = "test.com",
+                client = {
+                }
+            }
+            local code, body = t.test('/apisix/admin/ssl/1',
+                ngx.HTTP_PUT,
+                json.encode(data)
+            )
+
+            if code >= 300 then
+                ngx.status = code
+            end
+            ngx.print(body)
+        }
+    }
+--- request
+GET /t
+--- error_code: 400
+--- response_body
+{"error_msg":"invalid configuration: property \"client\" validation failed: 
property \"ca\" is required"}
+
+
+
+=== TEST 3: set verification
+--- config
+    location /t {
+        content_by_lua_block {
+            local t = require("lib.test_admin")
+            local json = require("toolkit.json")
+            local ssl_ca_cert = t.read_file("t/certs/mtls_ca.crt")
+            local ssl_cert = t.read_file("t/certs/mtls_client.crt")
+            local ssl_key = t.read_file("t/certs/mtls_client.key")
+            local data = {
+                upstream = {
+                    scheme = "https",
+                    type = "roundrobin",
+                    nodes = {
+                        ["127.0.0.1:1994"] = 1,
+                    },
+                    tls = {
+                        client_cert = ssl_cert,
+                        client_key = ssl_key,
+                    }
+                },
+                plugins = {
+                    ["proxy-rewrite"] = {
+                        uri = "/hello"
+                    }
+                },
+                uri = "/mtls"
+            }
+            local code, body = t.test('/apisix/admin/routes/1',
+                ngx.HTTP_PUT,
+                json.encode(data)
+            )
+
+            if code >= 300 then
+                ngx.status = code
+                ngx.say(body)
+                return
+            end
+
+            local data = {
+                upstream = {
+                    type = "roundrobin",
+                    nodes = {
+                        ["127.0.0.1:1980"] = 1,
+                    },
+                },
+                uri = "/hello"
+            }
+            assert(t.test('/apisix/admin/routes/2',
+                ngx.HTTP_PUT,
+                json.encode(data)
+            ))
+
+            local data = {
+                cert = ssl_cert,
+                key = ssl_key,
+                sni = "localhost",
+                client = {
+                    ca = ssl_ca_cert,
+                    depth = 2,
+                }
+            }
+            local code, body = t.test('/apisix/admin/ssl/1',
+                ngx.HTTP_PUT,
+                json.encode(data)
+            )
+
+            if code >= 300 then
+                ngx.status = code
+            end
+            ngx.print(body)
+        }
+    }
+--- request
+GET /t
+
+
+
+=== TEST 4: hit
+--- request
+GET /mtls
+--- more_headers
+Host: localhost
+--- response_body
+hello world
+
+
+
+=== TEST 5: no client certificate
+--- config
+    location /t {
+        content_by_lua_block {
+            local t = require("lib.test_admin")
+            local json = require("toolkit.json")
+            local ssl_ca_cert = t.read_file("t/certs/mtls_ca.crt")
+            local ssl_cert = t.read_file("t/certs/mtls_client.crt")
+            local ssl_key = t.read_file("t/certs/mtls_client.key")

Review comment:
       These certificates were not used in this test, I think they can be 
removed.




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