A simple tool and script intended to be run periodically by launchd(8) to sync
an openssl style CA pem with the certificates found in the OSX Keychain(s).
The original name is now a misnomer, as the software will manage certificate
bundles for both openssl and libressl installed under Homebrew.
The Makefile contains a target called osx-ca-certs that acts a lot like
security export -t certs -p, except that it does not dump certificates that
are marked as untrusted as the latter does.
The keychains exported to the CA bundle by default are:
System.keychain
SystemRootCertificates.keychain
login.keychain (if run as a user)
The installed CA pem file will be made available through the default X.509 store
path. This is commonly found in either: /usr/local/etc/openssl/cert.pem (for
Intel based Macs) or /opt/homebrew/etc/openssl/cert.pem (for M1/ARM based Macs).
Installation
To install via homebrew:
brew tap raggi/ale
brew install openssl-osx-ca
brew services start openssl-osx-ca
To install standalone:
make install
To set the frequency, set the value of FREQUENCY when installing, defaults to
3600, one hour. The value of FREQUENCY must be a value in seconds.
make install FREQUENCY=3600
Other variables from the Makefile can be overridden, take a look at the head
of the Makefile for more information.
Intended use cases
Ruby 2.0.0+
LibreSSL users
OpenSSL users
Other brew / manually installed things that link a non-Apple TLS
implementations
Known limitations & Notes
Only supports El Capitan and above.
Syncs are by default perfomed once per hour.
Syncs may not be sufficiently atomic. There is a small possiblity of race
conditions that could cause openssl programs to fail. The sync time is very
very short, so in practice this is unlikely.
OSX CA bundles are not always particularly up to date, for example in August
2016, they contained 17 expired certificates and several that Mozilla have
chosen to remove, either for technical or audit reasons.
Installation as root is generally not required, and may require some extra
changes to the Makefile.
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