[SR-Users] REGISTER with http_async_client ?

[Olle E. Johansson]

> On 2 Feb 2022, at 23:58, Cyril Ramière <cyril.ramiere at 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 at gmail.com <mailto:khorsmann at 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 <https://www.kamailio.org/docs/modules/devel/modules/auth_ephemeral.html>
> 
> 
> Cyril Ramière <cyril.ramiere at gmail.com <mailto:cyril.ramiere at 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 <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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