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Description of problem:

After the switch of crypto library in openldap from NSS to openssl, the behaviour of intermediate certificates has changed.

Where previously a certificate and chain would be read from the certificate PEM file or NSS database automatically, the openldap code in the openssl case reads the certificate only and ignores the rest of the certificates in the chain.

This causes outages when machines are upgraded from pre-rhel7.5 to rhel7.5 or higher through routine patching.

Version-Release number of selected component (if applicable):

RHEL7.5 and up.

How reproducible:

Always.

Steps to Reproduce:
1. Deploy an LDAP infrastructure that uses client certificates with intermediate certificates using pre RHEL7.5 versions of code.
2. Conduct routine patch.
3.

Actual results:

Outage - SSL connections that previously worked now fail with "untrusted certificate" errors.

Expected results:

Patching doesn't take out a whole platform.

Additional info:

The problem exists in openldap on this line:

https://github.com/openldap/openldap/blame/b06f5b0493937fc28f2cc86df1d7f464aa4504d8/libraries/libldap/tls_o.c#L387

To fix this problem, use SSL_CTX_use_certificate_chain_file() as recommended by OpenSSL.

After evaluating this issue, there are no plans to address it further or fix it in an upcoming release.  Therefore, it is being closed.  If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.