02-25-2009
Password accepted but kicked out
The Sun Solaris x86 system seemed to accept my username and password when I do SSH, but then the login prompt went away or hang. What happened?
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LEARN ABOUT REDHAT
login.krb5
LOGIN(8C) LOGIN(8C)
NAME
login.krb5 - kerberos enhanced login program
SYNOPSIS
login.krb5 [ -fF [username] ]
DESCRIPTION
login.krb5 is a modification of the BSD login program which is used for two functions. It is the sub-process used by krlogind and telnetd
to initiate a user session and it is a replacement for the command-line login program which, when invoked with a password, acquires Ker-
beros tickets for the user.
login.krb5 will prompt for a username, or take one on the command line, as login.krb5 username and will then prompt for a password. This
password will be used to acquire Kerberos Version 5 tickets and Kerberos Version 4 tickets (if possible.) It will also attempt to run aklog
to get AFS tokens for the user. The version 5 tickets will be tested against a local krb5.keytab if it is available, in order to verify the
tickets, before letting the user in. However, if the password matches the entry in /etc/passwd the user will be unconditionally allowed
(permitting use of the machine in case of network failure.)
OPTIONS
-r hostname
pass hostname to rlogind.
-h hostname
pass hostname to telnetd, etc.
-f name
Perform pre-authenticated login, e.g., datakit, xterm, etc.; allow preauthenticated login as root.
-F name
Perform pre-authenticated login, e.g.,for datakit, xterm, etc.; allows preauthenticated login as root.
-e name
Perform pre-authenticated, encrypted login. Must do term negotiation.
CONFIGURATION
login.krb5 is also configured via krb5.conf using the login stanza. A collection of options dealing with initial authentication are pro-
vided:
krb5_get_tickets
Use password to get V5 tickets. Default value true.
krb4_get_tickets
Use password to get V4 tickets. Default value true.
krb4_convert
Use Kerberos conversion daemon to get V4 tickets. Default value false. If false, and krb4_get_tickets is true, then login will get
the V5 tickets directly using the Kerberos V4 protocol directly. This does not currently work with non MIT-V4 salt types (such as
the AFS3 salt type.) Note that if configuration parameter is true, and the krb524d is not running, login will hang for approxi-
mately a minute under Solaris, due to a Solaris socket emulation bug.
krb_run_aklog
Attempt to run aklog. Default value true.
aklog_path
Where to find it [not yet implemented.] Default value $(prefix)/bin/aklog.
accept_passwd
Don't accept plaintext passwords [not yet implemented]. Default value false.
DIAGNOSTICS
All diagnostic messages are returned on the connection or tty associated with stderr.
SEE ALSO
rlogind(8C), rlogin(1C), telnetd(8c)
BUGS
Should use a config file to select use of V5, V4, and AFS, as well as policy for startup.
LOGIN(8C)