TLS Connections (Client Side)

Last modified 29 May 2024 12:41 +02:00

Connectors, notification plugins and other parts of midPoint connect to external systems. Some of the connections are secured using SSL/TLS. In SSL/TLS connections the server side provides a certificate that needs to be validated on the client side. This means that midPoint needs to have a way how to check validity of the certificate provided by SSL/TLS server. MidPoint is using standard Java libraries to validate the certificate. Java security modules are using a truststore mechanism which is closely related to keystore. The truststore is a small database of trusted certificates. When a certificate needs to be validate Java libraries check if the certificates the authority in chain that issues are in the truststore.

For real deployments with public or private certification authorities all root and intermediate certificates in chain must be imported into midPoint keystore.

The following procedure describes how to get server certificate and import it into the trustore which makes it a trusted certificate. Basic steps to do:

  1. Getting server certificate

  2. Import the certificate

Getting server certificate

There are many tools to get a server certificate from SSL/TLS connection. We prefer to use opensource library OpenSSL (openssl library for windows can be downloaded here) . It has a nice s_client utility to do this.

Example how to obtain all server certificates in chain:

openssl s_client -showcerts -servername google.com -connect google.com:443
Loading 'screen' into random state - done
CONNECTED(00000260)
depth=2 /C=US/O=Google Trust Services LLC/CN=GTS Root R1
verify error:num=20:unable to get local issuer certificate
verify return:0
---
Certificate chain
 0 s:/CN=*.google.com
   i:/C=US/O=Google Trust Services LLC/CN=GTS CA 1C3
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----
 1 s:/C=US/O=Google Trust Services LLC/CN=GTS CA 1C3
   i:/C=US/O=Google Trust Services LLC/CN=GTS Root R1
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----
 2 s:/C=US/O=Google Trust Services LLC/CN=GTS Root R1
   i:/C=BE/O=GlobalSign nv-sa/OU=Root CA/CN=GlobalSign Root CA
-----BEGIN CERTIFICATE-----
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d0lIKO2d1xozclOzgjXPYovJJIultzkMu34qQb9Sz/yilrbCgj8=
-----END CERTIFICATE-----
---
Server certificate
subject=/CN=*.google.com
issuer=/C=US/O=Google Trust Services LLC/CN=GTS CA 1C3
---
No client certificate CA names sent
---
SSL handshake has read 7076 bytes and written 439 bytes
---
New, TLSv1/SSLv3, Cipher is AES128-SHA
Server public key is 2048 bit
Compression: NONE
Expansion: NONE
SSL-Session:
    Protocol  : TLSv1
    Cipher    : AES128-SHA
    Session-ID:
    Session-ID-ctx:
    Master-Key: 4F24E1D13BF6CA43603CB185446DCB8AB1F57CBCC128B2A15C0F4186DFC517ECFF60FFBC472D0FCE6175584565790B31
    Key-Arg   : None
    TLS session ticket lifetime hint: 100800 (seconds)
    TLS session ticket:
    0000 - 02 4b 12 f2 f4 b7 98 7b-7d 30 dd 33 1f bd 28 ca   .K.....{}0.3..(.
    0010 - a8 27 ef cf 8d 8f 73 5d-7f 78 fd 67 cb 97 a6 c6   .'....s].x.g....
    0020 - dc 23 3c 29 f5 7c 6a b8-53 e6 30 6d 1a 14 61 22   .#<).|j.S.0m..a"
    0030 - 14 01 45 2a e4 98 6b 0e-35 fd 46 17 d8 81 c2 d5   ..E*..k.5.F.....
    0040 - d2 06 5f 1a 0a 32 1f 9e-64 b1 7e 9a af 50 09 bd   .._..2..d.~..P..
    0050 - 89 26 62 08 84 6c 80 fa-d6 43 09 63 44 b4 9a 94   .&b..l...C.cD...
    0060 - 2b d1 7e 33 73 73 6b 9e-a5 99 af 88 1e 70 7d 0c   +.~3ssk......p}.
    0070 - 5b 72 51 0e 00 e4 6c ae-20 12 ff 4b 01 af 70 69   [rQ...l. ..K..pi
    0080 - 81 4f 42 cd 95 9e fe 2c-7a 3f 45 a4 21 ad 23 60   .OB....,z?E.!.#`
    0090 - f4 b3 37 84 69 55 95 9f-69 ec 21 6a 7a 5b da 74   ..7.iU..i.!jz[.t
    00a0 - 66 9c 60 3f cc 5a fc 5c-b2 b6 aa db 50 06 31 22   f.`?.Z.\....P.1"
    00b0 - 90 f4 39 73 05 cf 99 f8-3c 05 77 6e 93 a7 95 9b   ..9s....<.wn....
    00c0 - 26 e8 59 84 f6 d1 21 ce-c0 b0 db 3e 15 b4 4b 33   &.Y...!....>..K3
    00d0 - 46 52 41 e2 19 9e 45 2e-06 e2 6d                  FRA...E...m

    Start Time: 1710417148
    Timeout   : 300 (sec)
    Verify return code: 20 (unable to get local issuer certificate)
---

Example how to obtain server certificate:

$ openssl s_client -connect deimos.lab.evolveum.com:3636
CONNECTED(00000003)
depth=1 OU = Organizational CA, O = EXAMPLE-TREE
verify error:num=19:self signed certificate in certificate chain
verify return:0
---
Certificate chain
 0 s:/O=EXAMPLE-TREE/CN=deimos
   i:/OU=Organizational CA/O=EXAMPLE-TREE
 1 s:/OU=Organizational CA/O=EXAMPLE-TREE
   i:/OU=Organizational CA/O=EXAMPLE-TREE
---
Server certificate
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
subject=/O=EXAMPLE-TREE/CN=deimos
issuer=/OU=Organizational CA/O=EXAMPLE-TREE
---
No client certificate CA names sent
---
SSL handshake has read 2831 bytes and written 551 bytes
---
New, TLSv1/SSLv3, Cipher is AES256-SHA
Server public key is 2048 bit
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
SSL-Session:
    Protocol  : TLSv1
    Cipher    : AES256-SHA
    Session-ID: 3D1D82E86E3F87CF4F5C61DF1A1C5061973B371C75EE089C1ED38FF5FAFC58F9
    Session-ID-ctx:
    Master-Key: A58639B7067B0169C626DB8B45BD50AAF12A50A2F09BA4FC5D0112CE40E74F5CA6BD941A0F86D744AA12AA1592F450A3
    Key-Arg   : None
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    Start Time: 1401979683
    Timeout   : 300 (sec)
    Verify return code: 19 (self signed certificate in certificate chain)
---

The data between -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- is the server certificate. Copy&paste the data into a separate file (including the boundary lines) and save it e.g. as servercert.pem.

Import the certificate

Import the server certificate to a truststore using keytool utility:

keytool -keystore /opt/midpoint/var/keystore.jceks -storetype jceks -storepass changeit -import -alias servercert -trustcacerts -file servercert.pem

Restart midPoint and that’s it.

Notes

  • Make sure that the correct keystore/truststore is used. By default connectors use JVM keystore unless it is overriden by JVM options. See Keystore Configuration page for more details.

  • If an import of a .p7b formated certificate results in the following error: java.lang.Exception: Input not an X.509 certificate. You might try to convert the certificate to the .cer PEM format. This can be done using the following openssl command:

openssl pkcs7 -inform der -in mycert.p7b -out myconvertedcert.cer

See Also

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