IPSERV(8)
NAME
telnetd, rlogind, rexexec, ftpd − Internet remote access daemons
SYNOPSIS
ip/telnetd [-adnptN] [-u user]
ip/rlogind
ip/rexexec
ip/ftpd [-eadp] [-n namepace-file]
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 /rc/bin/service (see listen(8)).
Telnetd allows login from a remote client. There are three types of login:
normal Normal users log in by encrypting and returning a challenge printed by telnetd. The user can use either the netkey program (see passwd(1)) or a SecureNet handheld authenticator to encrypt the challenge. /lib/namespace defines the namespace.
noworld Users in group noworld in /adm/users authenticate with a password in the clear. /lib/namespace.noworld defines the namespace.
anonymous User none requires no authentication. /lib/namespace defines the namespace.
The options are:
a allow anonymous login by none
d print debugging to standard error
p don’t originate any telnet control codes
n turn on local character echoing and imply the p option
t trusted, that is, don’t authenticate
u use user as the local account name
N permit connections by ‘noworld’ users only.
Rlogind logs in using the BSD remote login protocol. Rlogind execs telnetd -nu after completing its initial handshake.
Rexexec executes a command locally for a remote client. It uses the standard Plan 9 authentication (see authsrv(6)).
Ftpd runs the Internet file transfer protocol. Users may transfer files in either direction between the local and remote machines. As for telnetd, there are three types of login:
normal Normal users authenticate via the same challenge/response as for telnetd. /usr/username/lib/namespace.ftp or, if that file does not exist, /lib/namespace defines the namespace.
noworld Users in group noworld in /adm/users login using a password in the clear. /lib/namespace.noworld defines the namespace.
anonymous Users anonymous and none require no authentication. The argument to the −n option (default /lib/namespace.ftp) defines the namespace. Anonymous users may only store files in the subtree below /incoming.
The options are:
a allow anonymous access
n the namespace for anonymous users (default /lib/namespace.ftp)
d write debugging output to standard error
e treat any user as anonymous
To preserve intended protections in shared file trees, any directory containing a file .httplogin is locked by ftpd; see httpd(8).
Imap4d provides access to a user’s mailboxes via the IMAP4rev1 protocol. Only files rooted in /mail/box/username/ are accessible. The list of subscribed mailboxes is contained in /mail/box/username/imap.subscribed, and initially contains only INBOX, IMAP’s name for the user’s mailbox. A shadow file, mailbox.imp, is created for each mailbox examined.
The options are:
a Assume the user is already authenticated. By default, the user must authenticate using CRAM-MD5 or securenet(8) challenge/response authentication.
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. Imap4d does not enforce this policy.
s The server’s name. If none is provided, cs (see ndb(8)) is queried or /env/sysname is used.
d The local mail domain. Defaults to the server /env/site in the mail server’s domain.
FILES
/lib/namepace
/usr/username/lib/namespace.ftp
/lib/namespace.world
/lib/namespace.ftp
/mail/box/username/mailbox
/mail/box/username/mailbox.imp
/mail/box/username/imap.subscribed
SOURCE
/sys/src/cmd/ip/telnetd.c
/sys/src/cmd/ip/rlogind.c
/sys/src/cmd/ip/rexexec.c
/sys/src/cmd/ip/ftpd.c
/sys/src/cmd/ip/imap4d/
SEE ALSO
Plan 9 — September 22, 2004