August 2003
Intermediate to advanced
270 pages
10h 9m
English
Content preview from Kerberos: The Definitive Guide
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Configuring the distribution
Once the OpenSSH distribution has been installed, the GSSAPI patches add a few options to the sshd_config configuration file to control the use of Kerberos authentication. The options in Table 7-3, added to the sshd_config file, are enabled by default.
Table 7-3. sshd_config options
Configuration flag | Description |
GssapiAuthentication | Specifies whether to enable GSSAPI authentication, through a successful key exchange (in this case Kerberos ticket exchange) or through password authentication. The default is “yes”. |
GssapiKeyExchange | Specifies whether to enable GSSAPI authentication through key exchange. |
PasswordAuthentication | Specifies whether to enable password-based authentication. If PasswordAuthentication is set to “yes”, sshd will authenticate passwords against the Kerberos KDC regardless of the value of GssapiAuthentication. |
Protocol | We highly recommend only allowing connections with protocol Version 2 clients. The Secure Shell protocol Version 1 had several vulnerabilities; besides, the GSSAPI patches only function on Version 2. |
In addition, the host will need to have a host key in its system keytab. Ensure that a host principal has been created and the keytab for that principal exists in the system keytab. Since all of the GSSAPI-related options default to “on” in the OpenSSH configuration file, the Kerberos single-sign-on should work out of the box. Before testing, ensure that the SSH server host has a valid keytab installed, and ensure that the client has ...
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