feat(websocket): Expanded example to demonstrate the transfer over TLS

components/esp_websocket_client/examples/target/main/CMakeLists.txt

@@ -1,2 +1,22 @@
-idf_component_register(SRCS "websocket_example.c"
-                    INCLUDE_DIRS ".")
+set(SRC_FILES "websocket_example.c") # Define source files
+set(INCLUDE_DIRS ".") # Define include directories
+set(EMBED_FILES "") # Initialize an empty list for files to embed
+
+# Conditionally append files to the list based on configuration
+#if(CONFIG_WS_OVER_TLS_MUTAL_AUTH)
+    list(APPEND EMBED_FILES
+        "certs/client_cert.pem"
+        "certs/ca_cert.pem"
+        "certs/client_key.pem")
+#endif()
+
+# For testing purpose we are using CA of wss://echo.websocket.events
+#if(CONFIG_WS_OVER_TLS_SERVER_AUTH)
+    list(APPEND EMBED_FILES
+        "certs/ca_certificate_public_domain.pem")
+#endif()
+
+# Register the component with source files, include dirs, and any conditionally added embedded files
+idf_component_register(SRCS "${SRC_FILES}"
+                       INCLUDE_DIRS "${INCLUDE_DIRS}"
+                       EMBED_TXTFILES "${EMBED_FILES}")

components/esp_websocket_client/examples/target/main/Kconfig.projbuild

@@ -16,10 +16,30 @@ menu "Example Configuration"
     config WEBSOCKET_URI
         string "Websocket endpoint URI"
         depends on WEBSOCKET_URI_FROM_STRING
-        default "ws://echo.websocket.events"
+        default "wss://echo.websocket.events"
         help
             URL of websocket endpoint this example connects to and sends echo
 
+    config WS_OVER_TLS_SERVER_AUTH
+        bool "Enable WebSocket over TLS with Server Certificate Verification Only"
+        default y
+        help
+            Enables WebSocket connections over TLS (WSS) with server certificate verification.
+            This setting mandates the client to verify the servers certificate, while the server
+            does not require client certificate verification.
+
+    config WS_OVER_TLS_MUTUAL_AUTH
+        bool "Enable WebSocket over TLS with Server Client Mutual Authentification"
+        default n
+        help
+            Enables WebSocket connections over TLS (WSS) with server and client mutual certificate verification.
+
+    config WS_OVER_TLS_SKIP_COMMON_NAME_CHECK
+        bool "Skip common name(CN) check during TLS authentification"
+        default n
+        help
+            Skipping Common Name(CN) check during TLS(WSS) authentificatio
+
     if CONFIG_IDF_TARGET = "linux"
       config GCOV_ENABLED
           bool "Coverage analyzer"

components/esp_websocket_client/examples/target/main/certs/ca_cert.pem

@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----
+MIIDazCCAlOgAwIBAgIUL04QhbSEt5oNbV4f7CeLLqTCw2gwDQYJKoZIhvcNAQEL
+BQAwRTELMAkGA1UEBhMCQVUxEzARBgNVBAgMClNvbWUtU3RhdGUxITAfBgNVBAoM
+GEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDAeFw0yNDAyMjMwODA2MjVaFw0zNDAy
+MjAwODA2MjVaMEUxCzAJBgNVBAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEw
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+AQUAA4IBDwAwggEKAoIBAQDjc78SuXAmJeBc0el2/m+2lwtk3J/VrNxHYkhjHa8K
+/ybU89VvKGuv9+L3IP67WMguFTaMgivJYUePjfMchtNJLJ+4cR9BkBKH4JnyXDae
+s0a5181LxRo8rqcaOw9hmJTgt9R4dIRTR3GN2/VLhlR+L9OTYA54RUtMyMMpyk5M
+YIJbcOwiwkVLsIYnexXDfgz9vQGl/2vBQ/RBtDBvbSyBiWox9SuzOrya1HUBzJkM
+Iu5L0bSa0LAeXHT3i3P1Y4WPt9ub70OhUNfJtHC+XbGFSEkkQG+lfbXU75XLoMWa
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+DgQWBBQGkdK2gR2HrQTnZnbuWO7I1+wdxDAfBgNVHSMEGDAWgBQGkdK2gR2HrQTn
+ZnbuWO7I1+wdxDAPBgNVHRMBAf8EBTADAQH/MA0GCSqGSIb3DQEBCwUAA4IBAQBx
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+hXjasfNxA8A9quORF5+rjYrwyUZHuzcs0FfSClckIt4tHKtt4moLufOW6/PM4fRe
+AgdDfiTupxYLJFz4hFPhfgCh4TjQ+f9+uP4IAjW42dJmTVZjLEku/hm5lxCFObAq
+RgfaNwH8Ug1r1xswjSZG
+-----END CERTIFICATE-----

components/esp_websocket_client/examples/target/main/certs/ca_certificate_public_domain.pem

@@ -0,0 +1,30 @@
+-----BEGIN CERTIFICATE-----
+MIIFFjCCAv6gAwIBAgIRAJErCErPDBinU/bWLiWnX1owDQYJKoZIhvcNAQELBQAw
+TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh
+cmNoIEdyb3VwMRUwEwYDVQQDEwxJU1JHIFJvb3QgWDEwHhcNMjAwOTA0MDAwMDAw
+WhcNMjUwOTE1MTYwMDAwWjAyMQswCQYDVQQGEwJVUzEWMBQGA1UEChMNTGV0J3Mg
+RW5jcnlwdDELMAkGA1UEAxMCUjMwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK
+AoIBAQC7AhUozPaglNMPEuyNVZLD+ILxmaZ6QoinXSaqtSu5xUyxr45r+XXIo9cP
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+Z3Vms/EY96Jc5lP/Ooi2R6X/ExjqmAl3P51T+c8B5fWmcBcUr2Ok/5mzk53cU6cG
+/kiFHaFpriV1uxPMUgP17VGhi9sVAgMBAAGjggEIMIIBBDAOBgNVHQ8BAf8EBAMC
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+yK5GhDDX8oVfGKF5u+decIsH4YaTw7mP3GFxJSqv3+0lUFJoi5Lc5da149p90Ids
+hCExroL1+7mryIkXPeFM5TgO9r0rvZaBFOvV2z0gp35Z0+L4WPlbuEjN/lxPFin+
+HlUjr8gRsI3qfJOQFy/9rKIJR0Y/8Omwt/8oTWgy1mdeHmmjk7j1nYsvC9JSQ6Zv
+MldlTTKB3zhThV1+XWYp6rjd5JW1zbVWEkLNxE7GJThEUG3szgBVGP7pSWTUTsqX
+nLRbwHOoq7hHwg==
+-----END CERTIFICATE-----

components/esp_websocket_client/examples/target/main/certs/client_cert.pem

@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----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+OmGPtaCBu5V9tJCZ9dfZvjkaK44NGwDw0urAcYRK2h7asnlflu7cnlGMBB0qY4kQ
+BX5WI8UjN6rECBHbtNRvEh06ogDdHbxYV+TibrqkkeDRw6HX1qqiEJ+iCgWEDQ==
+-----END CERTIFICATE-----

components/esp_websocket_client/examples/target/main/certs/client_key.pem

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQCrNeomxI2aoP+4
+iUy5SiA+41oHUDZDFeJOBjv5JCsKmlvFqxE9zynmPOVpuABErOJwzerPTa4NYKvu
+vs5CxVJUV5CXtWANuu9majioZNzjf877MDNX/GnZHK2gnkxVrZCPaDmx9yiMsFMX
+gmfdrDhwoUpXbdgSyeU/al9Ds2kF0hrHOH2LBWt/mVeLbONU5CC1HOdVVw+uRlhV
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+pvCCMaWjAgMBAAECggEAOTWjz16AXroLmRMv8v5E9h6sN6Ni7lnCrAXDRoYCZ+Ga
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+6mY9FnUUufbJcpHxN58RTw==
+-----END PRIVATE KEY-----

components/esp_websocket_client/examples/target/main/certs/server_cert.pem

@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----
+MIIDWjCCAkKgAwIBAgIUUPCOgMA2v09E29fCkogx3RUBRtAwDQYJKoZIhvcNAQEL
+BQAwRTELMAkGA1UEBhMCQVUxEzARBgNVBAgMClNvbWUtU3RhdGUxITAfBgNVBAoM
+GEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDAeFw0yNDAyMjMwODA2NTlaFw0zNDAy
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+M7sdNQab8P2crAUtBKnkNOl/na/5KnXnjwi/PmWJJ9i2Cqt0PPkaykTWp/MLfYIw
+RPkY2Yo8f8gEiqXQd+0qTuMgumbgkPq3V8Lk1ocy62F5/qUhXxH+ifAXEoUQS6EG
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+jcnLa31TdDdWmWYDcYgZntAv6yGi3rh0MdYqeNS0FKlMKmaH81VHs7V1UUXwUQ==
+-----END CERTIFICATE-----

components/esp_websocket_client/examples/target/main/certs/server_key.pem

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQC8WWbDxnLzTSfu
+QaO+kQnnzbwjhUHWn58s+BIEaO8MGG6bX+8r/SH9XjMfFS36qAN3qxgRun3YoRTa
+Hc2QByiGjf5IL4EAPDnLN+NzUIL57Gi2QPQP/GksAsOGKWk/nMRPk1vcMptkFVIW
+Sp474SQ0A92Z9z0dUIqBpjRa34krHsAIcT59/EG7YBBadMk0fQIxQVLh3Vosky85
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+qm7ABfGXCCApx28n9B8zY5JbJKNqJgS15vELA+ojAoGAAkaV2w46+3iQ6gJtQepr
+zGNybiYBx/Wo5fDdTS5u0xN+ZdC9fl2Zs0n7sMmUT8bWdDLcMnntHHO+oDIKyRHs
+TQh1n68vQ4JoegQv3Z9Z/TLEKqr9gyJC1Ao6M4bZpPhUWQwupfHColtsr2TskcnJ
+Nf2FpJZ7z6fQEShGlK1yTXM=
+-----END PRIVATE KEY-----

components/esp_websocket_client/examples/target/main/websocket_example.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2022-2024 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Unlicense OR CC0-1.0
  */
@@ -91,7 +91,7 @@ static void websocket_event_handler(void *handler_args, esp_event_base_t base, i
         if (data->op_code == 0x08 && data->data_len == 2) {
             ESP_LOGW(TAG, "Received closed message with code=%d", 256 * data->data_ptr[0] + data->data_ptr[1]);
         } else {
-            ESP_LOGW(TAG, "Received=%.*s", data->data_len, (char *)data->data_ptr);
+            ESP_LOGW(TAG, "Received=%.*s\n\n", data->data_len, (char *)data->data_ptr);
         }
 
         // If received data contains json structure it succeed to parse
@@ -143,6 +143,28 @@ static void websocket_app_start(void)
     websocket_cfg.uri = CONFIG_WEBSOCKET_URI;
 #endif /* CONFIG_WEBSOCKET_URI_FROM_STDIN */
 
+#if CONFIG_WS_OVER_TLS_MUTUAL_AUTH
+    /* Configuring client certificates for mutual authentification */
+    extern const char cacert_start[] asm("_binary_ca_cert_pem_start"); // CA certificate
+    extern const char cert_start[] asm("_binary_client_cert_pem_start"); // Client certificate
+    extern const char cert_end[]   asm("_binary_client_cert_pem_end");
+    extern const char key_start[] asm("_binary_client_key_pem_start"); // Client private key
+    extern const char key_end[]   asm("_binary_client_key_pem_end");
+
+    websocket_cfg.cert_pem = cacert_start;
+    websocket_cfg.client_cert = cert_start;
+    websocket_cfg.client_cert_len = cert_end - cert_start;
+    websocket_cfg.client_key = key_start;
+    websocket_cfg.client_key_len = key_end - key_start;
+#elif CONFIG_WS_OVER_TLS_SERVER_AUTH
+    extern const char cacert_start[] asm("_binary_ca_certificate_public_domain_pem_start"); // CA cert of wss://echo.websocket.event, modify it if using another server
+    websocket_cfg.cert_pem = cacert_start;
+#endif
+
+#if CONFIG_WS_OVER_TLS_SKIP_COMMON_NAME_CHECK
+    websocket_cfg.skip_cert_common_name_check = true;
+#endif
+
     ESP_LOGI(TAG, "Connecting to %s...", websocket_cfg.uri);
 
     esp_websocket_client_handle_t client = esp_websocket_client_init(&websocket_cfg);