Lua issues

From: Iosif Fettich <ifettich_at_netsoft.ro>
Date: Tue, 25 Aug 2015 19:21:14 +0300 (EEST)

Hi,

I've tried to test a needed lua script on an up-to-date Fedora 21 box, by
downloading the source rpm and tinkering with it.

The script I'd want to get working looks like

---
if odkim.internal_ip(ctx) == 0 then
     author = odkim.get_mtasymbol(ctx, "{auth_author}")
     if author == nil then
         -- domains_to_sign_for = odkim.db_open( "file:/etc/opendkim/MyDomains" );
         domains_to_sign_for = odkim.get_dbhandle(ctx, DB_DOMAINS);
         from    = odkim.get_fromdomain(ctx)
         odkim.log(ctx, "From:" .. from )
         if domains_to_sign_for == nil then
             odkim.log(ctx, "LUA error... NO DOMAINS defined?")
             return nil
         else
             if odkim.db_check(domains_to_sign_for, from) == 1 then
                 odkim.set_result(ctx, SMFIS_REJECT)
                 host = odkim.get_clienthost(ctx)
                 odkim.log(ctx, "Message rejected. External host " .. host ..  " attempted to send as " .. from .. "." )
                 return nil
              end
         end
         -- odkim.db_close( domains_to_sign_for );
     end
end
--  That's it!
return nil
---
and there are [at least] two issues I'm having with it.
a) as presented, opendkim exits with segmentation fault at launchtime when 
/etc/opendkim.conf says
#SetupPolicyScript /etc/opendkim/setup_dont_spoof_localusers.lua
ScreenPolicyScript /etc/opendkim/setup_dont_spoof_localusers.lua
but starts OK if the conf file says
SetupPolicyScript /etc/opendkim/setup_dont_spoof_localusers.lua
#ScreenPolicyScript /etc/opendkim/setup_dont_spoof_localusers.lua
Why would that be...?!
b) even when starting OK, as SetupPolicyScript, the script will report 
"LUA error... NO DOMAINS defined?" in the logfile, as long as I'm trying 
to use
   domains_to_sign_for = odkim.get_dbhandle(ctx, DB_DOMAINS);
However, if I out-comment this line and do use instead the (above 
out-commented) db_open/db_close pair, things work OK, messages are 
rejected as wanted.
Why wouldn't
odkim.get_dbhandle(ctx, DB_DOMAINS)
not work...?
My build opendkim displays
$ opendkim -V
opendkim: OpenDKIM Filter v2.10.3
         Compiled with OpenSSL 1.0.1k-fips 8 Jan 2015
         SMFI_VERSION 0x1000001
         libmilter version 1.0.1
         Supported signing algorithms:
                 rsa-sha1
                 rsa-sha256
         Supported canonicalization algorithms:
                 relaxed
                 simple
         Active code options:
                 USE_DB
                 USE_LUA
         libopendkim 2.10.3:
and the source package was installed via
# yum install opendkim-2.10.3-1.fc21.src.rpm
followed by make, make install etc.
Many thanks in advance for any clou.
Iosif Fettich

Received on Tue Aug 25 2015 - 16:21:30 PST