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BUILD_TLS.md

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Building for TLS Support

If you want to include support for Transport Layer Security (tls tcp:// and wss:// URLs) you should follow these directions.

TLS support in NNG depends on either the Mbed TLS or WolfSSL library (your choice).

Important

These libraries are licensed under different terms than NNG. You are responsible for reading those license terms, and ensuring that your use conforms to them.

Tip

This project receives no compensation or support in any other form from either ARM (owners of the Mbed TLS project) or WolfSSL. Thus, as a special request, if you're paying for commercial licenses for either Mbed TLS or WolfSSL for use with NNG, please consider also sponsoring this project or obtaining a commercial support contract from Staysail Systems, Inc. You can enquire about support contracts at [email protected]. Sponsorship information is available on our GitHub page. Thank you!

On many distributions you may be able to install a pre-packaged version of either library. We recommend doing so if this is an option for you. For example, Ubuntu users can install the libmbedtls-dev package.

You can also build these from source; if you choose to do so, please make sure you also install it somewhere (even a temporary staging directory).

Configuring NNG with TLS

TLS support is not enabled by default, but can be enabled by configuring with the CMake option NNG_ENABLE_TLS=ON.

You can select which library to use by using NNG_TLS_ENGINE=mbed or NNG_TLS_ENGINE=wolf. If you specify neither, then Mbed TLS will be assumed by default.

By default NNG searches for an installed components in /usr/local, as well as the normal installation directories for libraries on your system.

If you have installed Mbed TLS elsewhere, you can direct the NNG configuration to it by setting the MBEDTLS_ROOT_DIR or WOLFSSL_ROOT_DIR CMake variable as appropriate.

Example

The following example would work on either Linux or macOS, and assumes that we have checked out github source trees into $HOME/work. It also assumes that Mbed TLS is already installed in /usr/local or a standard search path.


$ export NNGDIR=$HOME/work/nng
$ mkdir build
$ cd build

$ cmake -G Ninja -DNNG_ENABLE_TLS=ON ..

... (lots of lines of output from cmake...)

$ ninja build

... (lots of lines of output from ninja...)

$ ./src/supplemental/tls/tls_test -v

... (lots of lines of output from the test ...)

Summary:
  Count of all unit tests:        9
  Count of run unit tests:        9
  Count of failed unit tests:     0
  Count of skipped unit tests:    0
SUCCESS: All unit tests have passed.