Friday, December 12, 2008

How to solve javax.net.ssl.SSLHandshakeException?

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:441)
at javax.mail.Service.connect(Service.java:233)
at javax.mail.Service.connect(Service.java:134)

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The problem is that our webapp is now acting as a SSL client, and as a client, it needs to obtain and 'trust' the server's public key.
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The fix

Obtain the server's public key.

To quote Microsoft; "consult your system administrator". The public/private key pair will live somewhere on the server. The public key should be located and copied to the server hosting JIRA/Confluence. For example:

scp root@mail.yourcompany.com:/etc/ssl/certs/imapd.pem .

If you have openssl installed locally, the key can be retrieved with a command like:

jturner@teacup:~$ openssl s_client -connect imap.atlassian.com:imaps
CONNECTED(00000003)
depth=0 /C=AU/ST=NSW/L=Sydney/O=Atlassian/CN=imap.atlassian.com/emailAddress=info@atlassian.com
.....
.....
Server certificate
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cut and paste the certificate (including BEGIN and END lines) into a local file (eg. imapd.pem).

Import the public key.

To do this, you need to use the keytool program that comes with Java. If you haven't already, add $JAVA_HOME/bin to your PATH, and then run the following:

jturner@teacup:~$ sudo keytool -import -alias mail.yourcompany.com -keystore $JAVA_HOME/jre/lib/security/cacerts -file imapd.pem
Enter keystore password: changeit
Owner: EMAILADDRESS=info@atlassian.com, CN=atlassian.com, O=Atlassian, L=Sydney, ST=NSW, C=AU
Issuer: EMAILADDRESS=info@atlassian.com, CN=atlassian.com, O=Atlassian, L=Sydney, ST=NSW, C=AU
Serial number: 0
Valid from: Fri Feb 11 14:09:05 EST 2005 until: Sat Feb 11 14:09:05 EST 2006
Certificate fingerprints:
MD5: CB:AE:7D:5D:1A:08:06:77:93:3B:0F:53:BB:40:C0:D4
SHA1: 7C:02:44:0D:A9:8F:F9:FB:BB:7B:C6:F1:52:DE:CA:00:17:D9:3A:A0
Trust this certificate? [no]: yes
Certificate was added to keystore

This will import the public key (imapd.pem) into Java's default keystore, and marks it as trusted.

On Windows the command is similar, eg.:

C:\Program Files\Java\jre1.6.0_05>bin\keytool -import -file c:\certs\imapd.pem -alias mail.yourcompany.com -keystore lib\security\cacerts
Enter keystore password:
Owner: CN=*.atlassian.com, OU=IT, O=ATLASSIAN SOFTWARE SYSTEMS PROPRIETARY LIMITED, L=Sydney, ST=NSW, C=au
Issuer: CN=DigiCert Global CA, OU=www.digicert.com, O=DigiCert Inc, C=US
Serial number: a2d7047dc5d47ba988c9685e1efb860
Valid from: Thu Jan 10 11:00:00 EST 2008 until: Fri Jan 14 10:59:59 EST 2011
Certificate fingerprints:
MD5: 9D:B4:9F:3D:0A:DE:6A:BD:BC:3D:95:BE:60:BD:70:02
SHA1: 67:C6:E9:C8:3F:F1:7A:3C:66:E2:CE:62:78:A1:66:84:35:5E:62:1E
Signature algorithm name: SHA1withRSA
Version: 3
.....

Trust this certificate? [no]: yes
Certificate was added to keystore

C:\Program Files\Java\jre1.6.0_05>

Restart the app server

3 comments:

MK said...

Hello, Thanks for the helpful article. It works fine and I successfully import the the certificate and my java program starts working. But the problem is that, after 2-3 runs of the program, it starts giving the same SSL errors and the pem file has to be imported again. what can I do to solve this?

Stamster said...

Java is pain-in-the-ass.

Lakshman Heart Healer said...

Thanks for the helpful information... :) :)

It really help in my problem..