From sergio.charrua@voip.pt Fri May 10 09:25:10 2024
From: Sergio Charrua <sergio.charrua@voip.pt>
To: sr-users@lists.kamailio.org
Subject: [SR-Users] Re: base64 decoding issue
Date: Fri, 10 May 2024 11:24:27 +0200
Message-ID:
 <CALZWR5x3z7a4HjPXB3DG_tUEW1ZdqDQoTNKpwDMD2yibT+CDrg@mail.gmail.com>
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 <CALZWR5wY_-yQQESjQRHROPg7UBKsKaA+ZFUDP+HirOC4GyNWxw@mail.gmail.com>
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Hi all!

Solved the issue by using s.decode.base64t instead of s.decode.base64 ...

Thanks anyway!

*S=C3=A9rgio Charrua*



On Fri, May 10, 2024 at 9:40=E2=80=AFAM Sergio Charrua <sergio.charrua(a)voip=
.pt>
wrote:

> Hi all!
>
> I have been dealing with STIR/SHAKEN for a few weeks now, and while doing
> some tests I have found an issue which I can't find the reason for.
>
> The script has the following route logic:
>
> route[HANDLE_STIRSHAKEN]
> {
>
>     xlog("L_INFO", "HANDLE_STIRSHAKEN - STIR/SHAKEN Logic");
>
>     if ($hdrc(Identity) =3D=3D 0 ){
>         xlog("L_INFO", "HANDLE_STIRSHAKEN - No Identity Header -> Skipping
> this logic");
>         return;
>     }
>
>     #Verify Call Identity
>     xlog("L_INFO", "HANDLE_STIRSHAKEN - Identity Header: $hdr(Identity)");
>     $var(header_1)=3D $(hdr(Identity){s.select,0,.});
>     $var(header_2)=3D $(hdr(Identity){s.select,1,.});
>     xlog("L_INFO", "HANDLE_STIRSHAKEN - Encoded Header 1: $var(header_1)");
>     xlog("L_INFO", "HANDLE_STIRSHAKEN - Encoded Header 2: $var(header_2)");
>     xlog("L_INFO", "HANDLE_STIRSHAKEN - Decoded Header 1:
> $(var(header_1){s.decode.base64})");
>     xlog("L_INFO", "HANDLE_STIRSHAKEN - Decoded Header 2:
> $(var(header_2){s.decode.base64})");
>
>     xlog("L_INFO", "HANDLE_STIRSHAKEN - Parsing!");
>     $var(hdr_1_json_payload) =3D $(var(header_1){s.decode.base64}); # Header
> 1
>     xlog("L_INFO", "HANDLE_STIRSHAKEN - Parsed!");
>
>     xlog("L_INFO", "HANDLE_STIRSHAKEN - Header 1 payload =3D
> $var(hdr_1_json_payload) ");
>
>     $var(hdr_2_json_payload) =3D $(var(header_2){s.decode.base64}); # Header
> 2
>     jansson_get_field($var(hdr_2_json_payload), "attest",
> "$var(attest_value)");
>     jansson_get_field($var(hdr_2_json_payload), "ppt", "$var(ppt_value)");
>     jansson_get_field($var(hdr_2_json_payload), "typ", "$var(typ_value)");
>     jansson_get_field($var(hdr_2_json_payload), "x5u", "$var(x5u_value)");
>
>     xlog("L_INFO", "HANDLE_STIRSHAKEN - $var(attest_value) $var(ppt_value)
> $var(typ_value) $var(x5u_value) ");
>
> }
>
>
> All it does is parse the Identity header received on the initial INVITE,
> decodes it (it is encoded in base64) and writes some JSON values on log.
> Nothing serious....
>
> As the Identity header is divided into multiple parts, separated by a ".",
> I get the first 2 parts in 2 private variables, as per lines:
>
>     $var(header_1)=3D $(hdr(Identity){s.select,0,.});
>     $var(header_2)=3D $(hdr(Identity){s.select,1,.});
>
> Logs show correctly that both variables are populated:
>
> May 10 09:09:42 kamailio1 kamailio[153201]: INFO: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <script>: HANDLE_STIRSHAKEN - Encoded Header 1:
> eyJhbGciOiAiRVMyNTYiLCJwcHQiOiAic2hha2VuIiwidHlwIjogInBhc3Nwb3J0IiwieDV1Ijo=
gImh0dHBzOi8vY2VydGlmaWNh
> dGVzLmNsZWFyaXAuY29tL2IxNWQ3Y2M5LTBmMjYtNDZjMi04M2VhLWEzZTYzYTgyZWMzYS83Y2M=
0ZGI2OTVkMTNlZGFkYTRkMWY5ODYxYjliODBmZS5jcnQifQ
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/parser/msg_parser.c:324]:
> parse_headers(): flags=3Dffffffffffffffff
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/pvapi.c:1418]: pv_printf_mode(): final
> buffer length 34
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/parser/msg_parser.c:324]:
> parse_headers(): flags=3Dffffffffffffffff
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/pvapi.c:1418]: pv_printf_mode(): final
> buffer length 34
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/pvapi.c:1418]: pv_printf_mode(): final
> buffer length 230
> May 10 09:09:42 kamailio1 kamailio[153201]: INFO: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <script>: HANDLE_STIRSHAKEN - Encoded Header 2:
> eyJhdHRlc3QiOiAiQSIsImRlc3QiOiB7InRuIjogWyIxNDA0NTI2NjA2MCJdfSwiaWF0IjogMTU=
0ODg1OTk4Miwib3JpZyI6IHsi
> dG4iOiAiMTgwMDEyMzQ1NjcifSwib3JpZ2lkIjogIjNhNDdjYTIzLWQ3YWItNDQ2Yi04MjFkLTM=
zZDVkZWVkYmVkNCJ9
>
>
> However, when decoding both values:
>
>     xlog("L_INFO", "HANDLE_STIRSHAKEN - Decoded Header 1:
> $(var(header_1){s.decode.base64})");
>     xlog("L_INFO", "HANDLE_STIRSHAKEN - Decoded Header 2:
> $(var(header_2){s.decode.base64})");
>
>  only $var(header_2) gets decoded:
>
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/parser/msg_parser.c:324]:
> parse_headers(): flags=3Dffffffffffffffff
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/pvapi.c:1418]: pv_printf_mode(): final
> buffer length 34
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/parser/msg_parser.c:324]:
> parse_headers(): flags=3Dffffffffffffffff
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/pvapi.c:1418]: pv_printf_mode(): final
> buffer length 34
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/pvapi.c:1418]: pv_printf_mode(): final
> buffer length 38
> May 10 09:09:42 kamailio1 kamailio[153201]: INFO: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <script>: *HANDLE_STIRSHAKEN - Decoded Header 1:*
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/parser/msg_parser.c:324]:
> parse_headers(): flags=3Dffffffffffffffff
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/pvapi.c:1418]: pv_printf_mode(): final
> buffer length 34
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/parser/msg_parser.c:324]:
> parse_headers(): flags=3Dffffffffffffffff
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/pvapi.c:1418]: pv_printf_mode(): final
> buffer length 34
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/pvapi.c:1418]: pv_printf_mode(): final
> buffer length 182
> May 10 09:09:42 kamailio1 kamailio[153201]: INFO: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <script>: *HANDLE_STIRSHAKEN - Decoded Header 2:
> {"attest": "A","dest": {"tn": ["14045266060"]},"iat": 1548859982,"orig":
> {"tn": "18001234567"},"origid": "3a47ca23-d7ab-446b-821d-33d5deedbed4"}*
>
> As you can veri
> And to ease debugging, I have isolated the line that generates the issue:
>
> May 10 09:09:42 kamailio1 kamailio[153201]: INFO: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <script>: HANDLE_STIRSHAKEN - Parsing!
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/parser/msg_parser.c:324]:
> parse_headers(): flags=3Dffffffffffffffff
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/pvapi.c:1418]: pv_printf_mode(): final
> buffer length 34
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/parser/msg_parser.c:324]:
> parse_headers(): flags=3Dffffffffffffffff
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/pvapi.c:1418]: pv_printf_mode(): final
> buffer length 34
> *May 10 09:09:42 kamailio1 kamailio[153201]: ERROR: {1 10 INVITE
> 1-1966540(a)10.20.0.1 <1-1966540(a)10.20.0.1>} <core> [core/lvalue.c:351]:
> lval_pvar_assign(): non existing right pvar*
> *May 10 09:09:42 kamailio1 kamailio[153201]: ERROR: {1 10 INVITE
> 1-1966540(a)10.20.0.1 <1-1966540(a)10.20.0.1>} <core> [core/lvalue.c:411]:
> lval_assign(): assignment failed at pos: (21,32-21,64)*
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/parser/msg_parser.c:324]:
> parse_headers(): flags=3Dffffffffffffffff
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/pvapi.c:1418]: pv_printf_mode(): final
> buffer length 34
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/parser/msg_parser.c:324]:
> parse_headers(): flags=3Dffffffffffffffff
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/pvapi.c:1418]: pv_printf_mode(): final
> buffer length 34
> May 10 09:09:42 kamailio1 kamailio[153201]: DEBUG: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <core> [core/pvapi.c:1418]: pv_printf_mode(): final
> buffer length 27
> May 10 09:09:42 kamailio1 kamailio[153201]: INFO: {1 10 INVITE
> 1-1966540(a)10.20.0.1} <script>: HANDLE_STIRSHAKEN - Parsed!
>
> Even though the $var(header_1) contains a base64 encoded string, the
> decoder seems to fail.
> If I copy the value contained in $var(header_1) to an online decoder like
> https://www.base64decode.org/ the string gets decoded correctly.
>
> I have even modified the line :
>
> $var(header_1)=3D $(hdr(Identity){s.select,0,.});
>
> to get the reverse index from the Identity string by doing
>
> $var(header_1)=3D $(hdr(Identity){s.select,-6,.});
>
> It gets the same encoded string, same value (as expected), but the result
> is the same: Kamailio's s.decode.base64 fails with the same error.
> i'm not sure what
>    assignment failed at pos: (21,32-21,64)
> could mean....
>
> I don't think my code is wrong, as the same function is used on
> $var(header_2) value and it works, but maybe someone can correct me.
>
> Greatly appreciate your help.
>
> Cheers,
>
> *S=C3=A9rgio Charrua*
>
>
>
>
>
>
>



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--===============1661236756==--