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Annotation of wikisrc/kerberos/system.mdwn, revision 1.10

1.1       schmonz     1: [[!tag kerberos howto]]
                      2: 
1.8       wiki        3: ## Why enable Kerberos on your system?
1.1       schmonz     4: 
1.2       schmonz     5: Convenience and security. With
                      6: [Kerberos](http://web.mit.edu/Kerberos/dialogue.html), a single
1.3       wiki        7: login grants access to all NetBSD web services. Configuration is easy
                      8: and you only have to do it once (sometimes less).
1.1       schmonz     9: 
1.5       schmonz    10: 
1.8       wiki       11: ## NetBSD
1.1       schmonz    12: 
1.2       schmonz    13: NetBSD needs to be configured to prevent Kerberos from being used
                     14: to log into _your_ system, and then to enable Kerberos.
1.1       schmonz    15: 
1.2       schmonz    16: 7. Either disable Kerberos auth for `sshd`, `login`, etc. in
1.4       wiki       17: `/etc/pam.d`, or tell your relevant services not to use PAM.
                     18: 
                     19:    /!\ Disabling KerberosAuthentication in `/etc/ssh/sshd_config` does **NOT** prevent `sshd` from invoking `pam_krb5.so` and prompting for a Kerberos password -- oops. Since you probably do not have a host key in the realm NETBSD.ORG you have little to fear from ssh's KerberosAuthentication method -- nothing can get tickets to use your machine, because there is no host instance for your machine shared between the NetBSD kerberos server and your local keytab. So, the bottom line: turn off UsePAM for `sshd` or adjust your PAM configuration; don't worry about KerberosAuthentication or GSSAPIAuthentication in `sshd` itself.
                     20: 
1.1       schmonz    21: 7. Create `/etc/krb5.conf` containing only the line `[libdefaults]`.
                     22: 
1.2       schmonz    23: NetBSD will now autodiscover and uses the NETBSD.ORG KDC as defined
                     24: in DNS. To use Kerberized TNF services, log in with your Kerberos
                     25: [[password]]:
1.1       schmonz    26: 
1.9       schmonz    27:     $ kinit <username>@NETBSD.ORG
1.1       schmonz    28: 
                     29: The right-hand side is a Kerberos realm, not a DNS domain. Case is significant!
1.3       wiki       30: 
1.8       wiki       31: 
1.9       schmonz    32: ## Mac OS X
1.8       wiki       33: 
                     34: OS X autodiscovers and uses the NETBSD.ORG KDC as defined in DNS.
                     35: To use Kerberized TNF services, log in with your Kerberos [[password]]:
                     36: 
1.9       schmonz    37:     $ kinit <username>@NETBSD.ORG
1.8       wiki       38: 
                     39: The right-hand side is a Kerberos realm, not a DNS domain. Case is significant!
                     40: 
                     41: ### A Keychain.app trick
                     42: 
                     43: To pop up a GUI password dialog:
                     44: 
1.9       schmonz    45:     $ kinit <username>@NETBSD.ORG </dev/null
1.8       wiki       46: 
                     47: Check "Remember this password in my keychain" to make future Kerberos
                     48: logins (sans input redirection) prompt-free.
                     49: 
1.10    ! wiki       50: ### Storing the Kerberos Password in Your Keychain
        !            51: 
        !            52: Let us say you have an account "bob" on the realm "NETBSD.ORG" with password "mypasswd". Then in a Terminal type on one single line
        !            53: 
        !            54:     security add-generic-password -a "bob" -l "NETBSD.ORG (bob)" -s "NETBSD.ORG" -w "mypasswd" -c "aapl" -T "/usr/bin/kinit"
        !            55: 
        !            56: This will create an item in your default Keychain named "NETBSD.ORG (bob)" with your Kerberos credentials and kinit it will be authorized to access it. You can add as many -T "/fulpath/program" switches as you want, each will give access to the specific program to use your kerberos credentials. For example -T "/Applications/Mail.app/Contents/MacOS/Mail" will add access for Mail.app.
        !            57: 
        !            58: More details with man security.
        !            59: 
        !            60: After that kinit bob@NETBSD.ORG will not prompt you for a password but will get it from the keychain.
        !            61: 
        !            62: (This tip is orignally from [superuser.com](http://superuser.com/questions/360262/integrate-kerberos-and-keychain))
1.8       wiki       63: 
                     64: ## Windows XP
1.3       wiki       65: 
1.9       schmonz    66: Windows does not provide an easy way to configure and use KDCs
                     67: different from the one embedded into an Active Directory.
1.4       wiki       68: 
1.9       schmonz    69: Therefore, to use [[Kerberos]], you should follow the following
                     70: steps:
1.4       wiki       71: 
1.9       schmonz    72: 7. Download the
                     73:    [MIT Kerberos for Windows](http://web.mit.edu/Kerberos/dist/#kfw-3.2)
                     74:    installer. It is composed of different tools traditionally found
                     75:    with Kerberos distributions, like
                     76:    [[!template id=man name=kinit section=1]] or
                     77:    [[!template id=man name=klist section=1]], and a Network Identity
                     78:    Manager, an application used to manage credential caching of
                     79:    Kerberos tickets.
                     80: 
                     81: 7. Install the package. Use the default provided options, then
                     82:    restart the computer.
                     83: 
                     84: 7. The Network Identity Manager
                     85:    [(PDF)](http://web.mit.edu/kerberos/kfw-3.2/kfw-3.2.2/netidmgr_userdoc.pdf)
                     86:    should automatically start when you login. As there is no principal
                     87:    currently configured, it should open a dialog box to obtain the
                     88:    new credentials.
1.4       wiki       89: 
                     90: 7. Enter your principal:
                     91: 
1.9       schmonz    92:     Username: <username>
                     93:     Realm: NETBSD.ORG
1.3       wiki       94: 
1.9       schmonz    95: 7. Click `Ok`. After a few seconds, it should obtain the TGT for
                     96:    you from the NETBSD.ORG KDC.