PSoC 6 MCU: HTTPS Server

This code example demonstrates the implementation of an HTTPS server with PSoC® 6 MCU and CYW43xxx connectivity devices.

It employs the HTTPS Server middleware library, which takes care of all the underlying socket connections with the HTTPS client. In this example, the HTTPS server establishes a secure connection with a HTTPS client through SSL handshake. Once the SSL handshake completes successfully, the HTTPS client can make GET, POST, and PUT requests with the server.

Tested with Mbed OS v6.2.1.

Requirements

Programming Language: C/C++
Associated Parts: All PSoC® 6 MCU parts
Mbed CLI
ModusToolbox v2.1 or later

Note: You do not need to install ModusToolbox to build and run this code example. However, installing it is required when you need to:
- Debug using the Eclipse for ModusToolbox IDE. See the user guide for details.
- Customize the default device configuration using any of the Configurator tools
- Port this code example to a new target that is not listed under the Supported Kits

Supported Toolchains (Mbed CLI argument `--toolchain`)

GNU Arm® Embedded Compiler v9.2.1 (GCC_ARM)
Arm compiler v6.14 (ARM)

Supported Kits (Mbed CLI argument `--target`)

PSoC 6 Wi-Fi BT Prototyping Kit (CY8CPROTO-062-4343W)
PSoC 62S2 Wi-Fi BT Pioneer Kit (CY8CKIT-062S2-43012)
PSoC 62 Wi-Fi BT Pioneer Kit (CY8CKIT-062-WIFI-BT)
PSoC 62S3 Wi-Fi BT Prototyping Kit (CY8CPROTO-062S3-4343W)
PSoC 62S1 Wi-Fi BT Pioneer Kit (CYWP62S1-43438EVB-01)
PSoC 62S1 Wi-Fi BT Pioneer Kit (CYWP62S1-43012EVB-01)

Hardware Setup

This example uses the board's default configuration. See the kit user guide to ensure that the board is configured correctly.

Note: The PSoC 6 BLE Pioneer Kit (CY8CKIT-062-BLE) and the PSoC 6 WiFi-BT Pioneer Kit (CY8CKIT-062-WIFI-BT) ship with KitProg2 installed. The ModusToolbox software requires KitProg3. Before using this code example, make sure that the board is upgraded to KitProg3. The tool and instructions are available in the Firmware Loader GitHub repository. If you do not upgrade, you will see an error like "unable to find CMSIS-DAP device" or "KitProg firmware is out of date".

For Mbed OS, the kit must be in DAPLink mode. Refer the KitProg3 User Guide (found in the Documentation tab in the Cypress Programming Solutions web page) for details of how to put the Pioneer Kit into DAPLINK mode.

Software Setup

Install a terminal emulator such as Tera Term or PuTTY if you don't have any.
OpenSSL

Note: This code example also uses the cURL utility to test the HTTPS server. This utility helps to send HTTPS GET, POST, and PUT requests to the server. The cURL utility (version 7.59.0) is already shipped with the ModusToolbox v2.1; it is available under {ModusToolbox install directory}/tools_<version>/modus-shell/bin).

Import the Code Example using Mbed CLI Tool

Mbed CLI commands are used to import the code example and compile. See Working with Mbed CLI web page.

mbed import https://github.com/cypresssemiconductorco/mbed-os-example-https-server

It first clones the code example repository from GitHub, and then deploys all the libraries. If you wish to perform the deploy process manually, follow the below commands:

Clone the GitHub code example repository:

git clone https://github.com/cypresssemiconductorco/mbed-os-example-https-server && cd mbed-os-example-https-server

Deploy the dependent libraries. The library files are identified with .lib extension.

mbed deploy

Set the current directory as root:

mbed new .

Operation

Connect the board to your PC using the provided USB cable through the KitProg3 USB connector.
Open mbed_app.json and modify the nsapi.default-wifi-ssid, nsapi.default-wifi-password, and nsapi.default-wifi-security macros to match the credentials of the Wi-Fi network that you want to connect to.
Because this code example uses a self-signed SSL certificate, you need to generate the certificates required by the HTTPS server and client so that they can successfully establish a secure HTTPS connection. Follow the steps provided in a separate section which explains how to generate the certificates.
Open the source/secure_keys.h file and do the following:
1. Modify keySERVER_CERTIFICATE_PEM with contents from the mysecurehttpserver.local.crt file generated in Step 3.
2. Modify keySERVER_PRIVATE_KEY_PEM with contents from the mysecurehttpserver.local.key file generated in Step 3.
3. Modify keyCLIENT_ROOTCA_PEM with contents from the rootCA.crt file generated in step 3.
Program the board.
```
mbed compile -m <TARGET> -t <TOOLCHAIN> --flash --sterm
```
For example, to build for the target CY8CPROTO_062_4343W with GCC_ARM toolchain, use the following command:
```
mbed compile -m CY8CPROTO_062_4343W -t GCC_ARM --flash --sterm
```
Note: With the --sterm option, Mbed CLI opens a new terminal with 9600-8N1 as the setting after programming completes. Do not use this option if you want to connect using another serial terminal application such as PuTTY or Tera Term.

After programming, the application starts automatically. Verify that the following logs appear on the serial terminal:

Info: ===================================
Info: PSoC 6 MCU: HTTPS Server
Info: ===================================

WLAN MAC Address : A0:C9:A0:3D:D3:6A
WLAN Firmware    : wl0: Jan 30 2020 21:41:53 version 7.45.98.95 (r724303 CY) FWID 01-5afc8c1e
WLAN CLM         : API: 12.2 Data: 9.10.39 Compiler: 1.29.4 ClmImport: 1.36.3 Creation: 2020-01-30 21:30:05
WHD VERSION      : v1.91.2 : v1.91.2 : GCC 9.2 : 2020-06-25 02:15:47 -0500
Info: Successfully connected to AP: WIFI_SSID
Info: IP Addr   : 192.168.0.109
Info: HTTPS server has successfully started. The server is running with above IP address

The client needs to install the rootCA.crt to trust the HTTPS website and its own certificate mysecurehttpclient.pfx. The *.pfx file bundles the client certificate and key in PKCS format.

Do the following to install the certificates on the client machine. In this code example, the HTTPS server has two type of clients: one uses the cURL utility while the other uses a web browser.
- cURL utility:
  - Ensure that the cURL utility has access to the rootCA.crt, mysecurehttpclient.crt, and mysecurehttpclient.key file generated in Step 3. cURL commands can be invoked from anywhere in your mbed-cli shell. The command takes the argument such as --cacert, --cert, and --key which indicates the file path to rootCA.crt, mysecurehttpclient.crt, and mysecurehttpclient.key respectively. See Step 10 for commands usage.
- Web browser:
  - Mozilla Firefox:
    1. Select Options > Privacy & Security (Windows) or Preferences > Privacy & Security (macOS and Ubuntu).
    2. Find the Certificates section and then click View Certificates.
      
      The browser displays the Certificate Manager dialog.
    3. Click Import and select the rootCA.crt file generated in Step 3 and click Open.
    4. Trust this certificate authority to identify websites and email users and click OK.
      
      The rootCA.crt is now installed.
    5. Similarly, import the client certificate mysecurehttpclient.pfx under Your Certificates on the Certificate Manager window. The certificate was generated with empty password; therefore, leave it empty if it asks for a password during import.
  - Google Chrome and Internet Explorer on Windows:
    1. In the Run dialog (click Win key + R) type certmgr.msc and click OK.
      
      The Windows Certificate Manager application opens.
    2. Navigate to the Trusted Root Certification Authorities/Certificates folder.
    3. Go to Action > All Tasks > Import and click Next.
    4. Select the rootCA.crt file generated in Step 3. Make sure to change file type as All Files to find the rootCA.crt file. Click Open.
    5. Select the certification store as Trusted Root Certification Authorities and click Finish.
    6. Click Yes to the security warning window to acknowledge that you trust rootCA.crt to allow its websites and email users.
      
      The rootCA.crt is now installed.
    7. Similarly, import the client certificate mysecurehttpclient.pfx under Personal category. The certificate was generated with empty password; therefore, leave it empty if it asks for a password during import.
  - Google Chrome (Ubuntu):
    1. Select Settings > Show Advanced Settings > HTTPS/SSL. Click Manage Certificates under Security tab.
    2. In the Certificate Manager window, click Import under the Authorities tab.
    3. Select the rootCA.crt file generated in step 3. Make sure to change file type as All Files to find the rootCA.crt file. Click Open.
    4. Trust this certificate authority to identify websites and email users and click OK.
      
      The rootCA.crt is now installed.
    5. Similarly, import the client certificate mysecurehttpclient.pfx under Personal category.
  - Google Chrome (macOS):
    1. Open Finder > Applications > Utilities > Keychain Access.
    2. Select the System keychain.
    3. Open File > Import Items, and import the certificate file rootCA.crt into the System keychain.
    4. Right-click the certificate and select Get Info.
      
      A certificate information window appears.
    5. Expand the Trust category and select Always Trust to trust this certificate authority.
    6. Similarly, import the client certificate mysecurehttpclient.pfx under MyCertificates category. The certificate was generated with empty password; therefore, leave it empty if it asks for a password.
  Note:
  - Browsers might need a restart after importing the certificate.
  - When importing the mysecurehttpclient.pfx file, the Chrome browser asks the user to set the CryptoAPI Private Key to protect the client certificate key from accessing it by the browser. The browser is given access to the client private key only after entering the correct key and allowing access by the user.
Ensure that your PC is connected to the same Wi-Fi access point that you have configured in Step 2.
Get the IP address of the kit from the console logs. Enter https://<IP address>:50007 in the browser to access the HTTPS server webpage.

Test the HTTPS server

Using Web Browser:

Enter the URL https://<IP address>:50007. This opens the HTML page; it will look like as follows:

Figure 1. HTTPS Web Page
Click Get LED status to send an HTTPS GET command to the server running on the kit.

The server returns the current LED status on the kit as a response. Note that entering the URL itself will send a GET command to the server to get the HTML page.
Click Toggle LED to send an HTTPS POST command to the server running on the kit.

The server acts on the command request and toggles the LED on the kit.

Using the cURL Utility:

Open Cygwin.bat from the modus-shell directory ({ModusToolbox install directory}/tools_<version>/modus-shell).

Set the path to rootCA.crt, mysecurehttpclient.crt, and mysecurehttpclient.key in a variable.

PATH_TO_ROOTCA="<Path to rootCA.crt file>"

PATH_TO_CLIENT_CRT="<Path to mysecurehttpclient.crt file>"

PATH_TO_CLIENT_KEY="<Path to mysecurehttpclient.key file>"

Set the path to HTTPS web page URL in a variable.
```
HTTPS_SERVER_URL="https://<IP address>:<Port number>"
```
For example:
```
HTTPS_SERVER_URL="https://192.168.0.108:50007"
```
where, 192.168.0.108 is the IP address of the target kit; 50007 is the HTTPS port number defined in secure_http_server.h file in the HTTPS_PORT macro.

Use the following cURL commands to test HTTPS commands with the HTTPS server:

HTTPS GET: Get the kit's LED status (ON or OFF).

curl --cacert $PATH_TO_ROOTCA --cert $PATH_TO_CLIENT_CRT --key $PATH_TO_CLIENT_KEY -X GET $HTTPS_SERVER_URL --output -

Verify that the HTTPS server responds with the following HTML output. This contains the LED status (ON or OFF) of the kit.

<!DOCTYPE html><html><head><title>HTTPS Server Demo</title></head><body><h1>HTTPS Server Demo</h1><form method="get"><fieldset><legend>HTTPS GET</legend><input type="submit" value="Get LED status"/><input type="text" name="led_status" value="OFF" size="3" readonly/></br></br></fieldset></br></form><form method="post"><fieldset><legend>HTTPS POST</legend><input type="submit" name="toggle_led" value="Toggle LED"/></br></br></fieldset></br></form></body></html>

HTTPS POST: Toggle the LED (ON or OFF) on the kit.

curl --cacert $PATH_TO_ROOTCA --cert $PATH_TO_CLIENT_CRT --key $PATH_TO_CLIENT_KEY -X POST $HTTPS_SERVER_URL --output -

Verify that the HTTPS server responds with the following HTML output. The response contains the LED status (ON or OFF) of the last GET request.

<!DOCTYPE html><html><head><title>HTTPS Server Demo</title></head><body><h1>HTTPS Server Demo</h1><form method="get"><fieldset><legend>HTTPS GET</legend><input type="submit" value="Get LED status"/><input type="text" name="led_status" value="OFF" size="3" readonly/></br></br></fieldset></br></form><form method="post"><fieldset><legend>HTTPS POST</legend><input type="submit" name="toggle_led" value="Toggle LED"/></br></br></fieldset></br></form></body></html>

HTTPS PUT: Register a new HTTP resource. The HTTPS server creates a new resource called myhellomessage.

curl --cacert $PATH_TO_ROOTCA --cert $PATH_TO_CLIENT_CRT --key $PATH_TO_CLIENT_KEY -X PUT -d "/myhellomessage=Hello - Message from HTTPS server!" $HTTPS_SERVER_URL --output -

Verify the newly created resource by sending an HTTPS GET request.

curl --cacert $PATH_TO_ROOTCA --cert $PATH_TO_CLIENT_CRT --key $PATH_TO_CLIENT_KEY -X GET $HTTPS_SERVER_URL/myhellomessage --output -

Verify that the HTTPS server responds with a Hello text message.
```
Hello - Message from HTTPS server!
```

Debugging

You can debug the example to step through the code. In the IDE, use the <Application Name> Debug (KitProg3_MiniProg4) configuration in the Quick Panel. For more details, see the "Program and Debug" section in the Eclipse IDE for ModusToolbox User Guide.

Follow the steps from Eclipse IDE for ModusToolbox User Guide to export the Mbed OS code example and import it into ModusToolbox IDE for programming and debugging.

Mbed OS also supports debugging using any IDE that supports GDB. We recommend the user to go through ARM Mbed's documentation on the debugging steps.

Note: (Only while debugging) On the CM4 CPU, some code in main() may execute before the debugger halts at the beginning of main(). This means that some code executes twice - before the debugger stops execution, and again after the debugger resets the program counter to the beginning of main(). See KBA231071 to learn about this and for the workaround.

Design and Implementation

Resources and Settings

Table 1. Application Resources

Resource	Alias/Object	Purpose
UART (HAL)	cy_retarget_io_uart_obj	UART HAL object used by Retarget-IO for Debug UART port
GPIO (HAL)	CYBSP_USER_LED	User LED

This example uses the Arm® Cortex®-M4 (CM4) CPU of PSoC 6 MCU to start the HTTPS server task. At device reset, the default Cortex-M0+ (CM0+) application enables the CM4 CPU and configures the CM0+ CPU to go to sleep.

In this example, the HTTPS server establishes a secure connection with a web browser or cURL client through SSL handshake. During the SSL handshake, the server presents its SSL certificate for verification and verifies the incoming client identity.

You can define the maximum number of HTTPS page resources for the HTTPS server in the mbed_app.json file, as follows. The HTTPS server library maintains the database of pages based on this value.

"macros": ["MAX_NUMBER_OF_HTTP_SERVER_RESOURCES=<N>"],

Note that if the MAX_NUMBER_OF_HTTP_SERVER_RESOURCES value is not defined, the HTTPS server will set it to 10 by default. This code example does not define this parameter in the application mbed_app.json; therefore, the application uses the default value of 10. This depends on the availability of memory on the MCU device.

Creating a Self-Signed SSL Certificate

The HTTPS server demonstrated in this example uses a self-signed SSL certificate. This means that there is no third-party certificate issuing authority, commonly referred to as CA, involved in the authentication of the server. Clients connecting to the server must have a root CA certificate to verify and trust the websites defined by the certificate. Only when the client trusts the website, it can establish secure connection with the HTTPS server.

Open Cygwin.bat from modus-shell directory ({ModusToolbox install directory}/tools_<version>/modus-shell).
Do the following to generate a self-signed SSL certificate:

Prerequisites

The OpenSSL library is required to generate a self-signed certificate for the HTTPS server.

Run the following command in your local environment to see if you already have OpenSSL installed.
```
which openssl
```
Install OpenSSL if the which command does not return a path.

Operating System Installation

Windows Windows OpenSSL installer

Ubuntu Linux apt-get install openssl

macOS Homebrew:brew install openssl

Generate SSL Certificate and Private Key

Run the following script to generate the self-signed SSL certificate and private key.

This code example does not use mDNS (Multicast Domain Name System). Therefore, the SSL certificates needs to be generated for the specific IP address obtained by the kit from the AP. For testing the code example, you should configure the kit to obtain a static IP address from the AP. See your AP's documentation, and set a static IP address for the kit's MAC address under test.

Before invoking the following command, modify the OPENSSL_SUBJECT_INFO macro in the generate_ssl_certs.sh file to match your local domain configuration such as Country, State, Locality, Organization, Organization Unit name, and Common Name. This macro is used by the openssl commands when generating the certificate.
```
./generate_ssl_certs.sh <IP address obtained by the kit>
```
This will produce the following files:
- mysecurehttpserver.local.crt - HTTPS server certificate.
- mysecurehttpserver.local.key - HTTPS server private key.
- rootCA.crt - HTTPS server rootCA certificate to trust the client.
- rootCA.key - HTTPS server root key used for signing the certificate.
- mysecurehttpclient.crt - HTTPS client certificate.
- mysecurehttpclient.key - HTTPS client key.
- mysecurehttpclient.pfx - Bundles the HTTPS client certificate and key in PKCS12 format.

The HTTPS server should be configured to take mysecurehttpserver.local.crt as the certificate, mysecurehttpserver.local.key as the private key, and rootCA.crt as the rootCA certificate.

You can either convert the values to strings manually following the format shown in source/secure_keys.h or use the HTML utility available here to convert the certificates and keys from PEM format to C string format. You need to clone the repository from GitHub to use the utility.

The rootCA.crt and mysecurehttpclient.pfx should be installed on the web browser clients which are trying to communicate with the HTTPS server. With cURL, the rootCA.crt, mysecurehttpclient.crt, and mysecurehttpclient.key can be passed as command-line arguments.

Related Resources

Application Notes
AN228571 – Getting Started with PSoC 6 MCU on ModusToolbox	Describes PSoC 6 MCU devices and how to build your first application with ModusToolbox
Code Examples
Using ModusToolbox	Using PSoC Creator
Device Documentation
PSoC 6 MCU Datasheets	PSoC 6 Technical Reference Manuals
Development Kits	Buy at www.cypress.com
CY8CKIT-062S2-43012 PSoC 62S2 WiFi-BT Pioneer Kit	CY8CKIT-062-WiFi-BT PSoC 6 WiFi-BT Pioneer Kit
CY8CPROTO-062-4343W PSoC 6 Wi-Fi BT Prototyping Kit	CY8CPROTO-062S3-4343W PSoC 6 WiFi-BT Pioneer Kit
CYW9P62S1-43438EVB-01 PSoC 62S1 Wi-Fi BT Pioneer Kit	CYW9P62S1-43012EVB-01 PSoC 62S1 Wi-Fi BT Pioneer Kit
Libraries
PSoC 6 Peripheral Driver Library (PDL) and docs	psoc6pdl on GitHub
Cypress Hardware Abstraction Layer (HAL) Library and docs	psoc6hal on GitHub
Middleware
http-server	http-server on GitHub
Connectivity-Utilities	connectivity-utilities on GitHub
Links to all PSoC 6 MCU Middleware	psoc6-middleware on GitHub
Tools
Eclipse IDE for ModusToolbox	The cross-platform, Eclipse-based IDE for IoT designers that supports application configuration and development targeting converged MCU and wireless systems.
PSoC Creator™	The Cypress IDE for PSoC and FM0+ MCU development.

Other Resources

Cypress provides a wealth of data at www.cypress.com to help you select the right device, and quickly and effectively integrate it into your design.

For PSoC 6 MCU devices, see How to Design with PSoC 6 MCU - KBA223067 in the Cypress community.

Document History

Document Title: CE231064 - PSoC 6 MCU: HTTPS Server

Version	Description of Change
2.0.0	Updated to Mbed OS v6.2.1. Updated README.md. Modified the code example behavior to demonstrate only secure mode. The repo name have changed accordingly.

All other trademarks or registered trademarks referenced herein are the property of their respective owners.

© Cypress Semiconductor Corporation, 2020. This document is the property of Cypress Semiconductor Corporation and its subsidiaries ("Cypress"). This document, including any software or firmware included or referenced in this document ("Software"), is owned by Cypress under the intellectual property laws and treaties of the United States and other countries worldwide. Cypress reserves all rights under such laws and treaties and does not, except as specifically stated in this paragraph, grant any license under its patents, copyrights, trademarks, or other intellectual property rights. If the Software is not accompanied by a license agreement and you do not otherwise have a written agreement with Cypress governing the use of the Software, then Cypress hereby grants you a personal, non-exclusive, nontransferable license (without the right to sublicense) (1) under its copyright rights in the Software (a) for Software provided in source code form, to modify and reproduce the Software solely for use with Cypress hardware products, only internally within your organization, and (b) to distribute the Software in binary code form externally to end users (either directly or indirectly through resellers and distributors), solely for use on Cypress hardware product units, and (2) under those claims of Cypress's patents that are infringed by the Software (as provided by Cypress, unmodified) to make, use, distribute, and import the Software solely for use with Cypress hardware products. Any other use, reproduction, modification, translation, or compilation of the Software is prohibited.
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Cypress, the Cypress logo, Spansion, the Spansion logo, and combinations thereof, WICED, PSoC, CapSense, EZ-USB, F-RAM, and Traveo are trademarks or registered trademarks of Cypress in the United States and other countries. For a more complete list of Cypress trademarks, visit cypress.com. Other names and brands may be claimed as property of their respective owners.

Name		Name	Last commit message	Last commit date
Latest commit History 5 Commits
images		images
source		source
.gitignore		.gitignore
LICENSE		LICENSE
README.md		README.md
connectivity-utilities.lib		connectivity-utilities.lib
generate_ssl_certs.sh		generate_ssl_certs.sh
http-server.lib		http-server.lib
mbed-os.lib		mbed-os.lib
mbed_app.json		mbed_app.json

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PSoC 6 MCU: HTTPS Server

Requirements

Supported Toolchains (Mbed CLI argument `--toolchain`)

Supported Kits (Mbed CLI argument `--target`)

Hardware Setup

Software Setup

Import the Code Example using Mbed CLI Tool

Operation

Test the HTTPS server

Using Web Browser:

Using the cURL Utility:

Debugging

Design and Implementation

Resources and Settings

Creating a Self-Signed SSL Certificate

Prerequisites

Generate SSL Certificate and Private Key

Related Resources

Other Resources

Document History

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Windows	Windows OpenSSL installer
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Infineon/mbed-os-example-https-server

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PSoC 6 MCU: HTTPS Server

Requirements

Supported Toolchains (Mbed CLI argument --toolchain)

Supported Kits (Mbed CLI argument --target)

Hardware Setup

Software Setup

Import the Code Example using Mbed CLI Tool

Operation

Test the HTTPS server

Using Web Browser:

Using the cURL Utility:

Debugging

Design and Implementation

Resources and Settings

Creating a Self-Signed SSL Certificate

Prerequisites

Generate SSL Certificate and Private Key

Related Resources

Other Resources

Document History

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Supported Toolchains (Mbed CLI argument `--toolchain`)

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