How to use sanitize fields for json output

[Enrico Polesel]

Hi all,

I want to use the linelog module to print logs in a machine readable format
for my ELK stack, I would like to print them in json.

I would like to have user controlled fields (like the username) sanitized,
from an old discussion[1] in this mailing list I find out that there is a
"jsonquote" xlat expansion available, so I tried to use it but with little
success since the module is unknown.

(0) linelog: ERROR: %T request [%{jsonquote:request:User-Name}] ....
> (0) linelog: ERROR:               ^ Unknown module
>

After a quick search in the wiki[2] I found out that the jsonquote xlat is
provided by the rlm_rest module. So I tried to enable it adding in
`mods-enabled` a symlink to the configuration file, but then the freeradius
server fails to start since the module is not configured (for example it
tries to connect to localhost but i have no web services enabled on the VM).


Is "jsonquote" the right way to achieve this? If it is, how can I use it
without configuring properly (and pointing to a real web server) the rest
module?


Thank you,
Enrico Polesel


[1]
http://lists.freeradius.org/pipermail/freeradius-users/2017-January/086317.html

[2] https://wiki.freeradius.org/config/Xlat#provided-by-modules_rlm_rest