Hello list.
I am trying to understand a reason for certificate-based authentication
failure to one of my directory servers.
A have 3 IPA replicas running on CentOS 7. After running yum update on
one of the nodes, PKI Tomcat failed to start. That system was not
updated for last year or so, so the problem might have existed earlier
and now was merely triggered by the update.
At first I suspected contents of /etc/pki/tomcat being wrong, however
that does not seem to be the case.
Trying to understand the issue, I decided to try to replicate the
authentication process "by hand":
I've set:
LDAPTLS_CACERTDIR="/etc/pki/pki-tomcat/alias"
LDAPTLS_CERT="NSS Certificate DB:subsystemCert cert-pki-ca"
However:
${NODE1}# ldapsearch -H ldaps://${NODE1}:636 -b "" -s base -Y EXTERNAL
-Q -LLL dn namingcontexts
ldap_sasl_interactive_bind_s: Inappropriate authentication (48)
additional info: missing client certificate
Interestingly, I _can_ authenticate this way to the other two nodes
(from the same node where authentication to a local dir server does not
work):
${NODE1}# ldapsearch -H ldaps://${NODE2}:636 -b "" -s base -Y EXTERNAL
-Q -LLL dn namingcontexts
dn:
namingcontexts: cn=changelog
namingcontexts: dc=infra,dc=linker,dc=shop
namingcontexts: o=ipaca
I don't understand what does "missing client certificate" mean in this
case, after all client configuration is identical, I am merely changing
the server to which I connect.
I've investigated the contents of /tmp/openldap-tlsmc*/*/*pem and it
seems to be correct (and same on all nodes), if I use ldapsearch -Y
EXTERNAL.
${NODE1}# openssl x509 -in /tmp/openldap-tlsmc-alias--*/cert.pem -text
Certificate:
Data:
Version: 3 (0x2)
Serial Number: 228 (0xe4)
Signature Algorithm: sha256WithRSAEncryption
Issuer: O=xxx CN=Certificate Authority
Validity
Not Before: Jul 12 08:49:04 2022 GMT
Not After : Jul 1 08:49:04 2024 GMT
Subject: O=xxx, CN=CA Subsystem
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
Public-Key: (2048 bit)
Modulus:
...
I suspected that maybe replication is somehow messed up, but it seems to
be working:
${NODE1}# ipa-replica-manage list `hostname` -v
${NODE2}: replica
last update status: Error (0) Replica acquired successfully:
Incremental update succeeded
last update ended: 2023-05-30 14:21:10+00:00
${NODE3}: replica
last update status: Error (0) Replica acquired successfully:
Incremental update succeeded
last update ended: 2023-05-30 14:21:10+00:00
As I understand, the cert-pki-ca certificate and private key is shared
between the nodes and can be used to authenticate to any of directory
servers?
What can possibly be different in directory servers between these nodes,
which results in certificate authentication failing to one server, and
succeeding to another?
Any hints would be appreciated.
Best regards,
Radoslaw
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