Well, there’s one right there in the firebird.conf, but perhaps it isn’t OBVIOUS enough. Here are the basic settings (‘None’ to disallow UDFs completely and ‘FULL’ to allow them anywhere) which you PROBABLY understood yourself:

UdfAccess None
UdfAccess = Full

And here is that tricky Restrict SETTING:
UdfAccess = Restrict C:\some\directory
For multiple directories, use SOMETHING like this:
UdfAccess = Restrict C:\some\directoryC:’sorne\other\directory
For Linux users:
UdfAccess = Restrict !some/directory

In the default setting ‘Restrict UDF, ‘UDF is a directory relative to root directory of Firebird installation.

Well, there’s one right there in the firebird.conf, but perhaps it isn’t obvious enough. Here are the basic settings (‘None’ to disallow UDFs completely and ‘Full’ to allow them anywhere) which you probably understood yourself:

UdfAccess None
UdfAccess = Full

And here is that tricky Restrict setting:
UdfAccess = Restrict C:\some\directory
For multiple directories, use something like this:
UdfAccess = Restrict C:\some\directoryC:’sorne\other\directory
For Linux users:
UdfAccess = Restrict !some/directory

In the default setting ‘Restrict UDF, ‘UDF is a directory relative to root directory of Firebird installation.