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|Oracle Directory Server Enterprise Edition Troubleshooting Guide 11g Release 1 (126.96.36.199.0)|
This section helps you troubleshoot when an SSL connection fails. It includes the following sections:
This chapter contains the following sections:
For information about troubleshooting SSL problems with Identity Synchronization for Windows, see Troubleshooting Problems With Identity Synchronization for Windows Over SSL
This section describes concepts to help you troubleshoot problems using SSL for Directory Server multi-master replication. Problems with SSL always appear on the supplier side. The error log will contain security related messages such as “SSL init failed.” or “Certificate not accepted.”
SSL connections always involve two participants:
The SSL client, which is the LDAP client sending the LDAP requests or the Directory Server sending the replication updates (the supplier).
The SSL server, which is the Directory Server accepting the LDAP requests (the consumer).
The SSL client initiates requests and the SSL server always receives the requests. During this exchange, the SSL server must provide credentials. Any SSL server needs to verify the credentials sent by the SSL client. In order to make this verification, the certificate database on the peer must contain the CA certificate of the certificate sent by the other peer.
In replication, SSL must be enabled in all replicas, even master replicas that only accept non-SSL operations. For example, a master server communicates with a hub server using SSL. The hub must listen on the SSL port. The master does not need listen on the SSL port because it is an SSL client. However, it must still define an SSL port, otherwise Directory Server can not initiate SSL certificate exchange for communication with the host server.
By default, SSL is enabled on all Directory Server instances. For a detailed explanation of how SSL works, see Secure Sockets Layer (SSL) in Oracle Directory Server Enterprise Edition Reference.
Failure of an SSL connection could be the result of one of the following:
Wrong security libraries patch family applied
Server not configured to accept SSL
SSL port not open
CA certificate not found
CA certificate not appropriate or expired
SSL client not sending certificate when required
SSL server certificate not imported
This section provides information about collecting and analyzing data to help you troubleshoot SSL problem, including problems replicating over SSL.
The Mozilla website provides NSS Security Tools that are helpful for debugging and troubleshooting SSL problems. You can obtain the source-code of the ssltap tools from http://www.mozilla.org/projects/security/pki/nss/tools.
The ssltap tool can capture the SSL communications between two systems. You must place the ssltap program between the connection from a Directory Server and an LDAP client. The program behaves like a Directory Server when it communicates with the LDAP client and behaves like the LDAP client when communicating with the Directory Server.
The certificates database resides instance-path/alias directory. Get the contents of this directory for each server involved in the problem.
For example, to see a list of the certificates that can be used as ns-slapd certificates (certificates with a u,, trust flags) use the dsadm command as follows:
dsadm list-certs instance-path
The command lists the certificates, such as defaultCert, the date from which it is valid, the date it expires, whether it is self-signed, who issued it, and to whom it is issued.
To see information about valid and trusted CA certificates (certificates with CT,, trust flags) use the dsadm command as follows:
dsadm list-certs --ca instance-path
This command provides the certificate alias, its dates of validity and expiration, whether it is built in, who issued it, and to whom it was issued. Verify that the SSL server and client certificates are generated by a certificate authorities that appear in the output of this command.
For detailed information about a particular certificate, use the dsadm command as follows:
dsadm show-cert instance-path certificate-alias
For example, the output of this command appears as follows:
server1 [/var/dsee/instances]> dsadm show-cert ds1 defaultCert Certificate: Data: Version: 3 (0x2) Serial Number: 00:85:8b:13:ef Signature Algorithm: PKCS #1 MD5 With RSA Encryption Issuer: "CN=server1,CN=Directory Server,O=example.com" Validity: Not Before: Fri Mar 23 14:10:51 2007 Not After : Sat Jun 23 14:10:51 2007 Subject: "CN=server1,CN=Directory Server,O=example.com" Subject Public Key Info: Public Key Algorithm: PKCS #1 RSA Encryption RSA Public Key: Modulus: 9a:c9:52:bd:ec:32:43:1a:39:96:90:02:f5:7e:18:45: 78:37:ca:8d:8f:c4:cc:6f:d1:7e:6c:38:d1:a1:53:41: 96:67:07:c7:c8:56:78:d1:f2:24:df:1f:eb:b2:07:5d: 6e:1f:58:fa:7a:f2:00:e4:95:d1:57:97:37:9d:22:31: 1c:b7:99:29:df:a3:8a:2a:87:e1:8b:54:ea:1f:7c:b7: 28:23:ce:be:7e:73:b3:87:f5:32:88:56:4e:58:68:f6: f6:01:2c:51:ca:07:00:40:ca:b3:9e:33:40:e8:f2:18: bc:16:d4:ac:ae:69:a7:c9:d7:g5:34:d4:87:11:2c:b1 Exponent: 65537 (0x10001) Signature Algorithm: PKCS #1 MD5 With RSA Encryption Signature: 29:76:4f:9f:ca:00:09:7b:05:ac:0f:26:6f:d1:93:aa: a8:c0:eb:a9:2a:39:e2:6e:08:0a:90:41:e5:7f:18:4a: 17:05:03:04:9b:ee:0a:dc:3c:ef:ee:aa:fc:ea:85:bf: f9:05:32:65:35:2c:e8:1f:32:9d:d6:a7:aa:68:a4:7a: e8:d9:4a:a0:a6:bc:fd:36:ba:d3:80:8a:1b:d3:81:8a: 68:1a:73:cc:36:7a:92:dc:eb:ec:af:02:6b:14:c7:77: e3:7d:95:19:e7:17:9d:d2:35:67:60:6b:9f:9b:d9:af: 01:f2:55:7f:5f:ce:23:a0:49:67:01:cd:30:38:8b:d2 Fingerprint (MD5): B8:34:27:AA:02:F6:07:FC:8F:D1:4A:AD:38:29:09 Fingerprint (SHA1): 3C:3B:BD:15:E8:1F:68:2E::E8:EJ:02:63:CD:8F:39:BE:DD:70 Certificate Trust Flags: SSL Flags: Valid CA Trusted CA User Trusted Client CA Email Flags: User Object Signing Flags: User
Confirm the validity of the certificate. Also, confirm that the issuer of the certificate is a valid and trusted certificate authority.
You can configure client authentication to be required or allowed. Verify the setting client authentication settings by using DSCC or by using the dsconf get-server-prop ssl-client-auth-mode command.
Note - User's of migrated 5.2 instances of Directory Server can verify the client authentication settings by checking the nsSSLClientAuth property in the dse.ldif file.
If you want only the SSL server to require the certificate, select Allow Certificate Based Client Authentication.
If you want both the SSL server and the SSL client to require a certificate, select Require Certificate Based Client Authentication.
Get a list of all the dynamically loaded libraries to see which NSS/SSL and NSPR libraries are being loaded. To get the list of dynamically loaded libraries on Solaris Intel or Linux, use the following command:
# cd install-path/lib; ldd ns-slapd
To get the list of dynamically loaded libraries on Solaris SPARC, Solaris AMD64 or HPUX, use the following command:
# cd install-path/lib/64; ldd ns-slapd
The dynamically loaded libraries will be located in the following directory:
You can use the ssltap tool to check if the hand shake is working on your system. The tool works like an SSL proxy, showing the communications between the LDAP client and the Directory Server and the packages being exchanged. For example, using this tool you might see where the server asks for a certificate but the client does not send the certificate or where the client proposes a cipher suite that the server does not support.
Since the SSL port 636 is hard-coded on the client side, the ssltap tool run on the Directory Server, where it must list on port 636 for incoming client requests. The SSL port of the Directory Server needs to be changed to a number other than 636 while running the ssltap tool.
For example, run ssltap as follows:
ssltap -vhfsxl -p 636 localhost:637 > output.html
After running some simple LDAP request on the client, such as ldaplist, the tool should have captures some SSL packets. Stop the tool by pressing CTRL-C and view the output file in a browser window. The output data is color coded so that data sent by the client is marked in blue and data sent by the server is marked in red.