[sr-dev] Reqd. help on Corex (Obfuscate) - Kamailio 4.2.x

[Muhammad Shahzad]

Hi,

The network io intercept feature basically allows kamailio script writer to
do whatever s/he may want to do with raw SIP packets (that are just
received by kamailio or about to be sent out by kamailio), e.g. encryption,
compression or any final touches to sip message before it is processed by
kamailio core. That is why it is purposely kept abstract and any particular
use or implementation is left to the script writer.

In your case the encryption / decryption code is in C/C++, you can try one
of the followings,

1. Writeup a C/C++ program that receives outgoing SIP message as text (and
some other parameters, e.g. encryption key) in input arguments and returns
the encrypted message in event_route [ network:msg ] and vice versa (for
incoming messages). You can call this program directly from kamailio.cfg
script.

2. Writeup e.g. a PERL wrapper for your encryption / decryption C/C++ code
and call it using kamailio app_perl module within event_route [ network:msg
] as demonstrated in this example,

http://kamailio.org/docs/modules/devel/modules/corex.html#idp125704

You can also use any other kamailio language bind of you choice as well,
e.g. Python, LUA, JAVA and so on.

I would recommend the second option, as it has less processing overhead for
kamailio.

Thank you.



On Tue, Sep 16, 2014 at 6:09 PM, Rahul MathuR <rahul.ultimate at gmail.com>
wrote:

> Hello,
>
> I was going through the new features and stumbled upon this new one -
> developed by Mohd. Shahzad Shafi.
> As already mentioned on the wiki about this module, I intend to use it for
> my custom security layer between UACs and SIP Proxy (Kamailio) but the
> issue is - the custom security layer (encryption/decryption code) is
> written in C and should precisely be applied for the messages between UAC
> and Proxy.
>
> Is there a way I can achieve this using Corex module since it does
> intercept the network I/O messages ?
>
> Any help here would be really appreciated.
>
> --
> Warm Regds.
> MathuRahul
>
> _______________________________________________
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> sr-dev at lists.sip-router.org
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>
>
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