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Re: [grouper-users] Active Directory, LDAPS, and Grouper (docker based config)

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  • From: "Hyzer, Chris" <>
  • To: "" <>, David Mak <>, "Murphy, Kellen J. (wfx6yz)" <>
  • Subject: Re: [grouper-users] Active Directory, LDAPS, and Grouper (docker based config)
  • Date: Mon, 11 Sep 2023 17:02:54 +0000
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I think just drop the cert in /opt/grouper/certs/client and it should work?  The anchors is for intermediate certs right?  Though there was a fix so upgrading to 4.6.0 should help too

From: <> on behalf of "Murphy, Kellen J. (wfx6yz)" <>
Sent: Monday, September 11, 2023 12:33 PM
To: <>; David Mak <>
Subject: Re: [grouper-users] Active Directory, LDAPS, and Grouper (docker based config)

That should​ all apply to 4.1.6.

You might try dropping the cert from the openssl s_client command into /opt/grouper/certs/anchors/ and running /bin/update-ca-trust in the Dockerfile instead of your keytool command. That might get you past your issue. 

Also... check out the #grouper channel on the InCommon Slack as it's more active and you might get more eyes on the issue. To be added just send a message here:

Good luck!

Kellen Murphy
Identity Architecture & Solutions Engineer

T +1 (434) 243-7248

University of Virginia
Information Technology Services (ITS)
Michie South
914 Emmet Street N.
P.O. Box 400217
Charlottesville, VA 22903

University of Virginia

From: <> on behalf of "David Mak" <>
Sent: Monday, September 11, 2023 10:44 AM
To: <>
Subject: [grouper-users] Active Directory, LDAPS, and Grouper (docker based config)

In need of some advice on configuring Grouper 4.1.6 running in a Docker
environment with an External systems configuration to connect to an Active
Directory server.

The server is configured with a self signed SSL certificate/CA cert and is
extracted via the following command:
 openssl s_client -connect -showcerts 2>/dev/null </
dev/null |  sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p'

Configured in our Dockerfile with something along the lines of:

RUN openssl s_client -connect -showcerts 2>/dev/null
</dev/null |  sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > /tmp/
RUN keytool -importcert -trustcacerts -cacerts -noprompt -storepass changeit -
file /tmp/AD_Server.crt -alias AD_Server

Connecting to the resultant container, with a bash shell, shows that the
certificate chain was successfully added as verified with "keytool list" but
attempts to test the connection from the Grouper UI results in:

Caused by:
matchedDn=null, responseControls=null, referralURLs=null, messageId=-1,
message=javax.naming.CommunicationException: simple bind failed: [Root exception is
Connection or outbound has closed],
providerException=javax.naming.CommunicationException: simple bind failed: [Root exception is
Connection or outbound has closed]]

And indeed, a TCPDump on the host running docker shows the connection is
closed due to a SSL handshake issue:
4       0.010043        MYHOSTIP        ADHOSTIP        TLSv1.2 560     Client
5       0.028978        ADHOSTIP        MYHOSTIP                TLSv1.2 4381
Server Hello, Certificate, Server Key Exchange, Certificate Request, Server
Hello Done
7       0.030552        MYHOSTIP                ADHOSTIP        TLSv1.2 73
Alert (Level: Fatal, Description: Certificate Unknown)
8       0.030686        MYHOSTIP                ADHOSTIP        TCP     66
60236 → 636 [FIN, ACK] Seq=502 Ack=4316 Win=64128 Len=0 TSval=3083478926

1) Is it the cacerts file in the JDK that I should be installing the certs
into? I even tried manually separating the certs into two files (openssl
returns two) and using two separate Docker COPY commands to put them into
separate files, and importing them with unique aliases using two different RUN
keytool commands, but get the same tcpdump behavior.
2) Is there documentation on connecting Grouper external systems with "custom"
configurations such as self signed certs, etc?

Thanks in advance for any advice.

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