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PAM_KRB5(8)               BSD System Manager's Manual              PAM_KRB5(8)

NAME
     pam_krb5 -- Kerberos 5 PAM module

SYNOPSIS
     [service-name] function-class control-flag pam_krb5 [options]

DESCRIPTION
     The Kerberos 5 PAM module supports the authentication, account management and password management func-tion function
     tion classes.  In terms of the function-class parameter, these are ``auth'' , ``account'' and
     ``password'' respectively.

   Kerberos 5 Authentication Module
     The Kerberos 5 authentication component provides functions to verify the identity of a user
     (pam_sm_authenticate()) and to set user specific credentials (pam_sm_setcred()).  pam_sm_authenticate()
     converts the supplied username into a Kerberos principal, by appending the default local realm name.
     It also supports usernames with explicit realm names.  If a realm name is supplied, then upon a suc-cessful successful
     cessful return, it changes the username by mapping the principal name into a local username (calling
     krb5_aname_to_localname()).  This typically just means the realm name is stripped.

     It prompts the user for a password and obtains a new Kerberos TGT for the principal.  The TGT is veri-fied verified
     fied by obtaining a service ticket for the local host.

     When prompting for the current password, the authentication module will use the prompt ``Password for
     <principal>:''.

     The pam_sm_setcred() function stores the newly acquired credentials in a credentials cache, and sets
     the environment variable KRB5CCNAME appropriately.  The credentials cache should be destroyed by the
     user at logout with kdestroy(1).

     The following options may be passed to this authentication module:

     debug              openpam_log(3) debugging information at PAM_LOG_DEBUG level.

     use_first_pass     If the authentication module is not the first in the stack, and a previous module
                        obtained the user's password, that password is used to authenticate the user.  If
                        this fails, the authentication module returns failure without prompting the user for
                        a password.  This option has no effect if the authentication module is the first in
                        the stack, or if no previous modules obtained the user's password.

     try_first_pass     This option is similar to the use_first_pass option, except that if the previously
                        obtained password fails, the user is prompted for another password.

     forwardable        Obtain forwardable Kerberos credentials for the user.

     no_ccache          Do not save the obtained credentials in a credentials cache.  This is a useful
                        option if the authentication module is used for services such as ftp or pop, where
                        the user would not be able to destroy them.  [This is not a recommendation to use
                        the module for those services.]

     ccache=name        Use name as the credentials cache.  name must be in the form type:residual.  The
                        special tokens `%u', to designate the decimal UID of the user; and `%p', to desig-nate designate
                        nate the current process ID; can be used in name.

     default_principal  Construct the principal from the authenticating user's username, rather than obtain-ing obtaining
                        ing it from the AuthenticationAuthority of the  user's OpenDirectory record.

     use_kcminit        Don't verify password, instead store the password in kcm and return success in the
                        pam chain.  So when used in this mode, the pam_krb5 module needs to be configured to
                        be `optional' and some other module `required'.

   Kerberos 5 Account Management Module
     The Kerberos 5 account management component provides a function to perform account management,
     pam_sm_acct_mgmt().  The function verifies that the authenticated principal is allowed to login to the
     local user account by calling krb5_kuserok() (which checks the user's .k5login file).

   Kerberos 5 Password Management Module
     The Kerberos 5 password management component provides a function to change passwords
     (pam_sm_chauthtok()).  The username supplied (the user running the passwd(1) command, or the username
     given as an argument) is mapped into a Kerberos principal name, using the same technique as in the
     authentication module.  Note that if a realm name was explicitly supplied during authentication, but
     not during a password change, the mapping done by the password management module may not result in the
     same principal as was used for authentication.

     Unlike when changing a UNIX password, the password management module will allow any user to change any
     principal's password (if the user knows the principal's old password, of course).  Also unlike UNIX,
     root is always prompted for the principal's old password.

     The password management module uses the same heuristics as kpasswd(1) to determine how to contact the
     Kerberos password server.

     The following options may be passed to this password management module:

     debug           syslog(3) debugging information at LOG_DEBUG level.

     use_first_pass  If the password management module is not the first in the stack, and a previous module
                     obtained the user's old password, that password is used to authenticate the user.  If
                     this fails, the password management module returns failure without prompting the user
                     for the old password.  If successful, the new password entered to the previous module
                     is also used as the new Kerberos password.  If the new password fails, the password
                     management module returns failure without prompting the user for a new password.

     try_first_pass  This option is similar to the use_first_pass option, except that if the previously
                     obtained old or new passwords fail, the user is prompted for them.

ENVIRONMENT
     KRB5CCNAME  Location of the credentials cache.

FILES
     /tmp/krb5cc_uid  default credentials cache (uid is the decimal UID of the user).
     $HOME/.k5login   file containing Kerberos principals that are allowed access.

SEE ALSO
     kdestroy(1), passwd(1), syslog(3), pam.conf(5), DirectoryService(8), pam(8)

NOTES
     Applications should not call pam_authenticate() more than once between calls to pam_start() and
     pam_end() when using the Kerberos 5 PAM module.

BSD                            January 15, 1999                            BSD