[OpenSIPS-Users] stir shaken verification

Thu Jan 5 22:40:48 UTC 2023

We have it slightly different but otherwise close to yours

    cache_fetch("local", $identity(x5u), $var(cert));
    if (!stir_shaken_check_cert($var(cert))) {
        xlog("--[$ci] STI Getting a fresh certificate, existing one doesn't exist or is invalid\n");

        $var(rc) = rest_get($identity(x5u), $var(cert));

        if ($var(rc) < 0) {
            xlog("--[$ci] STI Failed to get the certificate\n");
            send_reply(436, "Bad Identity Info");
            exit;
        }

        xlog("--[$ci] STI got certificate[$var(cert)]\n");

        cache_store("local", $identity(x5u), $var(cert));
    } else {

        xlog("--[$ci] Using cached certificate\n");

    }

________________________________
From: Users <users-bounces at lists.opensips.org> on behalf of Marcin Groszek <marcin at voipplus.net>
Sent: Thursday, January 5, 2023 4:19 PM
To: users at lists.opensips.org <users at lists.opensips.org>
Subject: Re: [OpenSIPS-Users] stir shaken verification

Thank you very much. I have the same file, and verification is still failing. Perhaps  my config:

$var(found) = cache_fetch("local", $identity(x5u), $var(cert));
if (!$var(found) || !stir_shaken_check_cert("$var(cert)")) {
    rest_get( "$identity(x5u)", $var(cert), $var(ctype), $var(http_rc));
    if ($rc<0 || $var(http_rc) != 200) {
        send_reply(436, "Bad Identity Info");
        exit;
    }
    cache_store("local", $identity(x5u), $var(cert), 60);
}

stir_shaken_verify( "$var(cert)", $var(err_sip_code), $var(err_sip_reason));
if ($rc < 0) {
    xlog("stir_shaken_verify() failed: $var(err_sip_code), $var(err_sip_reason) \n");
    send_reply( $var(err_sip_code), $var(err_sip_reason));
    exit;
}

I figured this much:

$var(cert) is a public certificate downloaded from $identity(x5u), if it does not exists in local cache it gets pulled and stored,

stir_shaken_check_cert("$var(cert)") is generating these errors:

ERROR:stir_shaken:load_cert: Failed to parse certificate
ERROR:stir_shaken:w_stir_check_cert: Failed to load certificate ( because the entry does not exists in local cashdb)

this forces the download of the public cert from $identity(x5u) and store in local cashdb

second attempt does not generate this errors, however calls with deferent identity header and url for public cert should generate same errors again as the public cert from new url is not in local cashdb, but it is NOT generating same error.

Also, I have minimize cache_store  down to 1 second and after that second call with same $identity(x5u) should generate same errors , but it is not.

an example at shaken-not-stirred page have :

rest_get( "$identity(x5u)", "$var(cert)",
        $var(ctype), $var(http_rc));

but this fails a start-up with error ERROR:core:fix_cmd: Param [2] expected to be a variable so I removed the double quotes from around $var(cert) .

On 1/5/2023 1:18 PM, Joseph Jackson wrote:
Hi Marcin,

I suspect you are correct that its how you are decoding the ca cert file from iconectiv.

attached is what we have currently and it works in our production enviroment.

If the maillist strips out that attachment let me know.  You can reach me directly at jjackson at aninetworks.net<mailto:jjackson at aninetworks.net>

Joseph

________________________________
From: Users <users-bounces at lists.opensips.org><mailto:users-bounces at lists.opensips.org> on behalf of Marcin Groszek <marcin at voipplus.net><mailto:marcin at voipplus.net>
Sent: Thursday, January 5, 2023 10:16 AM
To: users at lists.opensips.org<mailto:users at lists.opensips.org> <users at lists.opensips.org><mailto:users at lists.opensips.org>
Subject: Re: [OpenSIPS-Users] stir shaken verification

Joseph, Thank you very much for your respond.

I have downloaded and apply new sti-ca file but certificate validation fails.

INFO:stir_shaken:verify_callback: certificate validation failed: certificate signature failure
INFO:stir_shaken:w_stir_verify: Invalid certificate
DBG:core:comp_scriptvar: int 26 : -8 / 0
[1637] stir_shaken_verify() failed: 437, Unsupported Credential

Perhaps I am not processing the sti-ca file properly.

I am testing this with a valid token , in fact test calls are coming from major cellular carrier in US and the verification fails.

I can see curl download the public cert, storing it in local cache and then attempt to verify, but it fails.

Upon next call with same token, the public cert is pulled from local cache and still fails.

On 1/4/2023 7:37 PM, Joseph Jackson wrote:
Hi Marcin,

We have a process that downloads the CA list from iconectiv nightly,  decodes the jwt and stores the certs in a single file in /etc/ssl/sti-ca/sti-ca.pem

Here is the opensips modparam

#stir and shaken
loadmodule "stir_shaken.so"
modparam("stir_shaken", "verify_date_freshness", 300)
modparam("stir_shaken", "auth_date_freshness", 300)
modparam("stir_shaken", "e164_strict_mode", 0)
#list of root certs for stir / shaken verification
modparam("stir_shaken", "ca_list", "/etc/ssl/sti-ca/sti-ca.pem")

This is on opensips v3.1.11

________________________________
From: Users <users-bounces at lists.opensips.org><mailto:users-bounces at lists.opensips.org> on behalf of Marcin Groszek <marcin at voipplus.net><mailto:marcin at voipplus.net>
Sent: Wednesday, January 4, 2023 6:12 PM
To: users at lists.opensips.org<mailto:users at lists.opensips.org> <users at lists.opensips.org><mailto:users at lists.opensips.org>
Subject: [OpenSIPS-Users] stir shaken verification

Opensips version 3.1.5

I am having some issues with stir_shaken setup. I am sure this not an issue with the module, but me.

stir_shaken_auth works just fine and I am able to sign the calls, however I was unable to find any document how to use a ca file available for download at iconectiv/download-list as well as via API. They do come in as jwt file, but after little manipulation individual certificates can be extracted, and the first one is the root certificate; I think, and the rest are trusted STI-CA. I guess my question is how do I use this file or any other cert file as "ca_list" and/or "ca_dir" .

After weeks and hundreds attempts I was unsuccessful, and I was unable to locate any document explaining preparation/setup/steps to setup verification.

All I get is :

ERROR:stir_shaken:load_cert: Failed to parse certificate
ERROR:stir_shaken:w_stir_verify: Failed to load certificate
on INVITE with valid identity header.

When I remove or replace  "ca_list" file with something bogus opensips does not even start  with errors:

ERROR:stir_shaken:init_cert_validation: Failed to load trustefd CAs
ERROR:core:init_mod: failed to initialize module stir_shaken

I would really appreciate some guidance on this one.

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--
Best Regards:
Marcin Groszek
Business Phone Service
https://www.voipplus.net

_______________________________________________
Users mailing list
Users at lists.opensips.org<mailto:Users at lists.opensips.org>
http://lists.opensips.org/cgi-bin/mailman/listinfo/users

--
Best Regards:
Marcin Groszek
Business Phone Service
https://www.voipplus.net
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