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k5login.5
.\" Man page generated from reStructuredText. . .TH "K5LOGIN" "5" " " "1.17" "MIT Kerberos" .SH NAME k5login \- Kerberos V5 acl file for host access . .nr rst2man-indent-level 0 . .de1 rstReportMargin \\$1 \\n[an-margin] level \\n[rst2man-indent-level] level margin: \\n[rst2man-indent\\n[rst2man-indent-level]] - \\n[rst2man-indent0] \\n[rst2man-indent1] \\n[rst2man-indent2] .. .de1 INDENT .\" .rstReportMargin pre: . RS \\$1 . nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin] . nr rst2man-indent-level +1 .\" .rstReportMargin post: .. .de UNINDENT . RE .\" indent \\n[an-margin] .\" old: \\n[rst2man-indent\\n[rst2man-indent-level]] .nr rst2man-indent-level -1 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]] .in \\n[rst2man-indent\\n[rst2man-indent-level]]u .. .SH DESCRIPTION .sp The .k5login file, which resides in a user\(aqs home directory, contains a list of the Kerberos principals. Anyone with valid tickets for a principal in the file is allowed host access with the UID of the user in whose home directory the file resides. One common use is to place a .k5login file in root\(aqs home directory, thereby granting system administrators remote root access to the host via Kerberos. .SH EXAMPLES .sp Suppose the user \fBalice\fP had a .k5login file in her home directory containing just the following line: .INDENT 0.0 .INDENT 3.5 .sp .nf .ft C bob@FOOBAR.ORG .ft P .fi .UNINDENT .UNINDENT .sp This would allow \fBbob\fP to use Kerberos network applications, such as ssh(1), to access \fBalice\fP\(aqs account, using \fBbob\fP\(aqs Kerberos tickets. In a default configuration (with \fBk5login_authoritative\fP set to true in krb5.conf(5)), this .k5login file would not let \fBalice\fP use those network applications to access her account, since she is not listed! With no .k5login file, or with \fBk5login_authoritative\fP set to false, a default rule would permit the principal \fBalice\fP in the machine\(aqs default realm to access the \fBalice\fP account. .sp Let us further suppose that \fBalice\fP is a system administrator. Alice and the other system administrators would have their principals in root\(aqs .k5login file on each host: .INDENT 0.0 .INDENT 3.5 .sp .nf .ft C alice@BLEEP.COM joeadmin/root@BLEEP.COM .ft P .fi .UNINDENT .UNINDENT .sp This would allow either system administrator to log in to these hosts using their Kerberos tickets instead of having to type the root password. Note that because \fBbob\fP retains the Kerberos tickets for his own principal, \fBbob@FOOBAR.ORG\fP, he would not have any of the privileges that require \fBalice\fP\(aqs tickets, such as root access to any of the site\(aqs hosts, or the ability to change \fBalice\fP\(aqs password. .SH SEE ALSO .sp kerberos(1) .SH AUTHOR MIT .SH COPYRIGHT 1985-2019, MIT .\" Generated by docutils manpage writer. .
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