D11520: kldap: add support for TLS CA certificate handling

[Tobias Junghans]

junghans created this revision.
junghans added a reviewer: mlaurent.
Restricted Application added a project: KDE PIM.
Restricted Application added a subscriber: KDE PIM.
junghans requested review of this revision.

REVISION SUMMARY
  This implements basic support for setting the TLS certificate request option (LDAP_OPT_X_TLS_REQUIRE_CERT) as well as a dedicated certificate
  file for checking server certificate (LDAP_OPT_X_TLS_CACERTFILE).

TEST PLAN
  TLS connection to LDAP server with self-signed certificate
  
  - scenario a) none of the new options set -> connection fails due to missing certificate to check against
  - scenario b) use LdapServer::TLSReqCertNever which makes the connection succeed
  - scenario c) use LdapServer::TLSReqCertHard and set tlsCACertFile which makes the connection succeed

REPOSITORY
  R178 PIM: KLDAP

REVISION DETAIL
  https://phabricator.kde.org/D11520

AFFECTED FILES
  src/ldapconnection.cpp
  src/ldapserver.cpp
  src/ldapserver.h

To: junghans, mlaurent
Cc: #kde_pim, dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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