晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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.TH "K5LOGIN" "5" " " "1.17" "MIT Kerberos"
.SH NAME
k5login \- Kerberos V5 acl file for host access
.
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.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
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