.TH IPSERV 8
.SH NAME
telnetd, rlogind, rexexec, ftpd \- Internet remote access daemons
.SH SYNOPSIS
.PP
.B ip/telnetd
.RB [ -adnptN ]
.RB [ -u
.IR user ]
.PP
.B ip/rlogind
.PP
.B ip/rexexec
.PP
.B ip/ftpd
.RB [ -aAde ]
.RB [ -n
.IR namepace-file ]
.PP
.SH DESCRIPTION
These programs support remote access across the Internet.  All expect the
network connection to be standard input, output, and error.  They are normally
started from scripts in
.B /rc/bin/service
(see
.IR listen (8)).
.PP
.I Telnetd
allows login from a remote client.
There are three types of login:
.TF anonymous
.TP
.I normal
Normal users log in by encrypting and returning a
challenge printed by
.IR telnetd .
The user can use either the
.IR netkey
program
(see
.IR passwd (1))
or a  SecureNet handheld authenticator to encrypt the challenge.
.B /lib/namespace
defines the namespace.
.TP
.I noworld
Users in group
.B noworld
in
.BR /adm/users 
authenticate with a password in the clear.
.B /lib/namespace.noworld
defines the namespace.
.TP
.I anonymous
User
.B none
requires no authentication.
.B /lib/namespace 
defines the namespace.
.PD
.PP
The options are:
.TP
.B a
allow anonymous login by
.B none
.TP
.B d
print debugging to standard error
.TP
.B p
don't originate any telnet control codes
.TP
.B n
turn on local character echoing and imply the
.B p
option
.TP
.B t
trusted, that is, don't authenticate
.TP
.B u
use
.I user
as the local account name
.TP
.B N
permit connections by `noworld' users only.
.PD
.PP
.I Rlogind
logs in using the BSD remote login protocol.
.I Rlogind
execs
.I telnetd
.B -nu
after completing its initial handshake.
.PP
.I Rexexec
executes a command locally for a remote client.  It uses the
standard Plan 9 authentication (see
.IR authsrv (6)).
.PP
.I Ftpd
runs the Internet file transfer protocol.  Users may transfer
files in either direction between the local and
remote machines.
As for
.IR telnetd ,
there are three types of login:
.TF anonymous
.TP
.I normal
Normal users authenticate
via the same challenge/response as for
.IR telnetd .
.BI /usr/ username /lib/namespace.ftp
or, if that file does not exist,
.B /lib/namespace
defines the namespace.
.TP
.I noworld
Users in group
.B noworld
in
.B /adm/users
login using a password in the clear.
.B /lib/namespace.noworld
defines the namespace.
.TP
.I anonymous
Users
.B anonymous
and
.B none
require no authentication.
The argument to the
.B \-n
option (default
.IR /lib/namespace.ftp )
defines the namespace.
Anonymous users may only store files in the subtree
below
.BR /incoming .
.PD
.PP
The options are:
.TP
.B a
allow anonymous access
.B A
allow
.I only
anonymous access
.TP
.B d
write debugging output to standard error
.TP
.B e
treat any user as anonymous
.TP
.B n
the namespace for anonymous users (default
.BR /lib/namespace.ftp )
.PP
To preserve intended protections in shared file trees,
any directory containing a file
.I .httplogin
is locked by
.IR ftpd;
see
.IR httpd (8).
.PP
.I Imap4d
provides access to a user's mailboxes via the IMAP4rev1 protocol.
Only files rooted in
.BI /mail/box/ username /
are accessible.
The list of subscribed mailboxes is contained in
.BI /mail/box/ username /imap.subscribed ,
and initially contains only
.BR INBOX ,
IMAP's name for the user's mailbox.
A shadow file,
.IB mailbox .imp ,
is created for each mailbox examined.
.PP
The options are:
.TP
.B a
Assume the user is already authenticated.
By default, the user must authenticate using
CRAM-MD5 or
.IR securenet (8)
challenge/response authentication.
.TP
.B p
Allow login authentication.  This option
should only be enabled for servers using
an encrypted connection, such as SSL,
and when enabled, all non-encrypted connections should be disallowed.
.I Imap4d
does not enforce this policy.
.TP
.B s
The server's name.
If none is provided,
.B cs
(see
.IR ndb (8))
is queried or
.B /env/sysname
is used.
.TP
.B d
The local mail domain.
Defaults to the server
.B /env/site
in the mail server's domain.
.SH FILES
.B /lib/namepace
.br
.BI /usr/ username /lib/namespace.ftp
.br
.B /lib/namespace.world
.br
.B /lib/namespace.ftp
.br
.BI /mail/box/ username / mailbox
.br
.BI /mail/box/ username / mailbox .imp
.br
.BI /mail/box/ username /imap.subscribed
.SH SOURCE
.B /sys/src/cmd/ip/telnetd.c
.br
.B /sys/src/cmd/ip/rlogind.c
.br
.B /sys/src/cmd/ip/rexexec.c
.br
.B /sys/src/cmd/ip/ftpd.c
.br
.B /sys/src/cmd/ip/imap4d/
.br
.SH "SEE ALSO"
.IR ftpfs (4)