[sr-dev] [kamailio/kamailio] TLS module: access UID attribute (#1843)

[Sebastian Denz]

To be honest i dont understand the code in detail, but i hope this helps:
```
xlog("L_INFO", "MY_LOG HANDLE_TLS tls_peer_subject         : $tls_peer_subject\n");
xlog("L_INFO", "MY_LOG HANDLE_TLS tls_peer_subject_uid:    : $tls_peer_subject_uid\n");
xlog("L_INFO", "MY_LOG HANDLE_TLS sel(tls.peer.subject)    : $sel(tls.peer.subject)\n");
xlog("L_INFO", "MY_LOG HANDLE_TLS sel(tls.peer.subject.uid): $sel(tls.peer.subject.uid)\n");
xlog("L_INFO", "MY_LOG: HANDLE_TLS add Header X-TLS-User: $sel(tls.peer.subject.uid)\n");
```

```
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: tls [tls_select.c:709]: get_comp(): after X509_NAME_get_index_by_NID index = 1
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: <core> [core/select.c:412]: run_select(): Calling SELECT 0x7f5b79367388
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: tls [tls_select.c:709]: get_comp(): after X509_NAME_get_index_by_NID index = 2
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: tls [tls_select.c:784]: pv_comp(): ind_local = 6
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: tls [tls_select.c:808]: pv_comp(): ind_local before switch = 0
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: tls [tls_select.c:709]: get_comp(): after X509_NAME_get_index_by_NID index = ffffffff
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: tls [tls_select.c:711]: get_comp(): nid = 0
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: tls [tls_select.c:722]: get_comp(): Element Unknown not found in certificate subject/issuer
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) INFO: <script>: MY_LOG HANDLE_TLS tls_peer_subject         : <null>
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: tls [tls_select.c:784]: pv_comp(): ind_local = 100006
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: tls [tls_select.c:808]: pv_comp(): ind_local before switch = 100000
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: tls [tls_select.c:709]: get_comp(): after X509_NAME_get_index_by_NID index = 0
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) INFO: <script>: MY_LOG HANDLE_TLS tls_peer_subject_uid:    : denzs
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: <core> [core/select.c:412]: run_select(): Calling SELECT 0x7f5b79351a38
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: tls [tls_select.c:709]: get_comp(): after X509_NAME_get_index_by_NID index = 1
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) INFO: <script>: MY_LOG HANDLE_TLS sel(tls.peer.subject)    : Sebastian Denz
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: <core> [core/select.c:412]: run_select(): Calling SELECT 0x7f5b7939bea0
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: tls [tls_select.c:709]: get_comp(): after X509_NAME_get_index_by_NID index = 0
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) INFO: <script>: MY_LOG HANDLE_TLS sel(tls.peer.subject.uid): denzs
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: <core> [core/select.c:412]: run_select(): Calling SELECT 0x7f5b7939bea0
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: tls [tls_select.c:709]: get_comp(): after X509_NAME_get_index_by_NID index = 0
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) INFO: <script>: MY_LOG: HANDLE_TLS add Header X-TLS-User: denzs
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: <core> [core/parser/msg_parser.c:185]: get_hdr_field(): content_length=0
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: <core> [core/parser/msg_parser.c:89]: get_hdr_field(): found end of header
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: <core> [core/select.c:412]: run_select(): Calling SELECT 0x7f5b7939bea0
Feb 14 08:59:44 edgar-dev kamailio[4078]: 11(4091) DEBUG: tls [tls_select.c:709]: get_comp(): after X509_NAME_get_index_by_NID index = 0
```

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