back-crts

LDAP backend module for CRTS. Allows arbitrary file read/write and command execution as the user slapd runs as.

Drop the back-crts directory in servers/slapd in the openldap source and do some trickery to its build system to build back-crts.

TODO

• Actually document trickery.
• Clean up CRTS-specific hardcoded stuff
• Generally make less janky
• Expand capabilities