# Network Security Services Network Security Services (NSS) is a set of libraries designed to support cross-platform development of security-enabled client and server applications. NSS supports SSL v3-TLS 1.2 (experimental TLS 1.3), PKCS #5, PKCS#7, PKCS #11, PKCS #12, S/MIME, X.509 v3 certificates, and other security standards. ## Getting started In order to get started create a new directory on that you will be uses as your local work area, and check out NSS and NSPR. (Note that there's no git mirror of NSPR and you require mercurial to get the latest NSPR source.) git clone https://github.com/nss-dev/nss.git hg clone https://hg.mozilla.org/projects/nspr NSS can also be cloned with mercurial hg clone https://hg.mozilla.org/projects/nss ## Building NSS **This build system is under development. It does not yet support all the features or platforms that NSS supports. To build on anything other than Mac or Linux please use the legacy build system as described below.** Build requirements: * [gyp](https://gyp.gsrc.io/) * [ninja](https://ninja-build.org/) After changing into the NSS directory a typical build is done as follows ./build.sh Once the build is done the build output is found in the directory `../dist/Debug` for debug builds and `../dist/Release` for opt builds. Exported header files can be found in the `include` directory, library files in directory `lib`, and tools in directory `bin`. In order to run the tools, set your system environment to use the libraries of your build from the "lib" directory, e.g., using the `LD_LIBRARY_PATH` or `DYLD_LIBRARY_PATH`. Usage: build.sh [-hcv] [-j ] [--nspr] [--gyp|-g] [--opt|-o] [-m32] [--test] [--fuzz] [--pprof] [--scan-build[=output]] [--asan] [--ubsan] [--msan] [--sancov[=edge|bb|func|...]] [--ct-verif] [--disable-tests] This script builds NSS with gyp and ninja. This build system is still under development. It does not yet support all the features or platforms that NSS supports. NSS build tool options: -h display this help and exit -c clean before build -v verbose build -j run at most concurrent jobs --nspr force a rebuild of NSPR --gyp|-g force a rerun of gyp --opt|-o do an opt build -m32 do a 32-bit build on a 64-bit system --test ignore map files and export everything we have --fuzz enable fuzzing mode. this always enables test builds --pprof build with gperftool support --ct-verif build with valgrind for ct-verif --scan-build run the build with scan-build (scan-build has to be in the path) --scan-build=/out/path sets the output path for scan-build --asan do an asan build --ubsan do an ubsan build --ubsan=bool,shift,... sets specific UB sanitizers --msan do an msan build --sancov do sanitize coverage builds --sancov=func sets coverage to function level for example --disable-tests don't build tests and corresponding cmdline utils ## Building NSS (legacy build system) After changing into the NSS directory a typical build of 32-bit NSS is done as follows: make nss_build_all The following environment variables might be useful: * `BUILD_OPT=1` to get an optimised build * `USE_64=1` to get a 64-bit build (recommended) The complete list of environment variables can be found [here](https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/Reference/NSS_environment_variables). To clean the build directory run: make nss_clean_all ## Tests ### Setup Make sure that the address `$HOST.$DOMSUF` on your computer is available. This is necessary because NSS tests generate certificates and establish TLS connections, which requires a fully qualified domain name. You can test this by calling `ping $HOST.$DOMSUF`. If this is working, you're all set. If it's not, set or export: HOST=nss DOMSUF=local Note that you might have to add `nss.local` to `/etc/hosts` if it's not there. The entry should look something like `127.0.0.1 nss.local nss`. If you get name resolution errors, try to ensure that you are using an IPv4 address; IPv6 is the default on many systems for the loopback device which doesn't work. ### Running tests **Runnning all tests will take a while!** cd tests ./all.sh Make sure that all environment variables set for the build are set while running the tests as well. Test results are published in the folder `../../test_results/`. Individual tests can be run with the `NSS_TESTS` environment variable, e.g. `NSS_TESTS=ssl_gtests ./all.sh` or by changing into the according directory and running the bash script there `cd ssl_gtests && ./ssl_gtests.sh`. The following tests are available: cipher lowhash libpkix cert dbtests tools fips sdr crmf smime ssl ocsp merge pkits chains ec gtests ssl_gtests bogo To make tests run faster it's recommended to set `NSS_CYCLES=standard` to run only the standard cycle. ## Releases NSS releases can be found at [Mozilla's download server](https://ftp.mozilla.org/pub/security/nss/releases/). Because NSS depends on the base library NSPR you should download the archive that combines both NSS and NSPR. ## Contributing [Bugzilla](https://bugzilla.mozilla.org/) is used to track NSS development and bugs. File new bugs in the NSS product. A list with good first bugs to start with are [listed here](https://bugzilla.mozilla.org/buglist.cgi?keywords=good-first-bug%2C%20&keywords_type=allwords&list_id=13238861&resolution=---&query_format=advanced&product=NSS). ### NSS Folder Structure The nss directory contains the following important subdirectories: - `coreconf` contains the build logic. - `lib` contains all library code that is used to create the runtime libraries. - `cmd` contains a set of various tool programs that are built with NSS. Several tools are general purpose and can be used to inspect and manipulate the storage files that software using the NSS library creates and modifies. Other tools are only used for testing purposes. - `test` and `gtests` contain the NSS test suite. While `test` contains shell scripts to drive test programs in `cmd`, `gtests` holds a set of [gtests](https://github.com/google/googletest). A more comprehensible overview of the NSS folder structure and API guidelines can be found [here](https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_API_Guidelines).