On 2 Feb 2022, at 23:58, Cyril Ramière <cyril.ramiere@gmail.com> wrote:

Hi Karsten,

Thanks for the clue, unfortunately I can't use this module because the clients are "dumb" sip phones.

The goal of my implementation is to use our application API to handle the login.

The plan was that a sip phone sends a REGISTER, I ask the API endpoint if this user/password is ok to connect and allow/deny based on the reply and informations provided by the API.

Everything is relying on the fact that I can make my HTTP call when handling the REGISTER, sadly for me, it doesn't work and I still can't figure why.

Try http_client. I’ve used it a lot of time for authentication. It will block your thread while waiting for response, but you can handle some of those issues by caching secrets for a short time with htable.

/O

Cheers,

Cyril

Le mer. 2 févr. 2022 à 19:49, Karsten Horsmann <khorsmann@gmail.com> a écrit :

Hi Cyril,

This Kamailio module could imho do the same 

https://www.kamailio.org/docs/modules/devel/modules/auth_ephemeral.html

Cyril Ramière <cyril.ramiere@gmail.com> schrieb am Do., 27. Jan. 2022, 08:04:

Hi there,

I have a weird issue with kamailio (latest docker image kamailio-ci:5.5.2-alpine) and http_async_client.

Before posting a lot of logs, let me describe what I want to achieve.

I have a Kamailio and a SIP Phone.

The SIP phone sends a REGISTER to kamailio, then in my routing block, I check if I have an Authorization header.

Since I don't have an Authorization (first message), I use "www_challenge()".

This replies to the SIP phone, and then the SIP phone sends a new REGISTER with the correct Authorization header.

So far so good.

Now, when I get the REGISTER with Authorization header, I want to ask an HTTP endpoint if this user is allowed to connect and check the password using http_async_query().

The problem is that when the transaction resumes, the tmx module is unhappy and throws this error :

30(36) CRITICAL: tmx [t_var.c:546]: pv_get_tm_reply_code(): no picked branch (-1) for a final response in MODE_ONFAILURE

And a 500 error is sent back to the sip phone.

The AUTH_REPLY route is still called and I can use the $http* values.

Do you see something that I am doing wrong or missing in my logic?

Is pausing/resuming to use the async http client is allowed if I'm handling a REGISTER transaction?

Here's a simplified version of my routing block (not far from reality):

##### SNIP 

request_route{

route(AUTH);

route[AUTH]{

    if (is_method("REGISTER"){
        if(no_auth_header){
            www_challenge("$td","1");
            exit;
        }
        else{
            t_newtran();
            http_async_query("http://xxx.xxx.xxx.xxx:9000/auth?foo=bar", "AUTH_REPLY");
        }
    }

}

route[AUTH_REPLY]{

    xlog("L_INFO", "route[HTTP_REPLY]: status $http_rs\n");

}

}

##### END SNIP

Best regards!

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