PASSWD(1) PASSWD(1)
NAME
passwd, netkey, iam - change user password
SYNOPSIS
passwd
netkey
auth/iam [ ]
DESCRIPTION
Passwd changes the invoker's Plan 9 password and/or APOP
secret. The Plan 9 password is used to login to a terminal
while the APOP secret is used for a number of external ser-
vices: POP3, IMAP, and VPN access.
The program first prompts for the old Plan 9 password to
establish identity. It then prompts for changes to the
password and the secret. New passwords and secrets must be
typed twice, to forestall mistakes. New passwords must be
sufficiently hard to guess. They may of any length greater
than seven characters.
Netkey uses the password to encrypt network challenges. It
is a substitute for a SecureNet box.
These commands may be run only on a terminal, to avoid
transmitting clear text passwords over the network.
Auth/iam can be run only by the the host owner (the user
specified as the contents of /dev/hostower). With it both
the identity and password of the host owner may be changed.
For example, if start a terminal and log in as `tor', you
may later change identity to `supertor'. If the host owner
changes, all processes running as the host owner also change
their identity to the new user id.
Without an argument, Auth/iam just sets the password of the
host owner. This can be used on machines like the Bitsy
which have no possibility of user input until the bootstrap
procedure has already started a number of processes.
FILES
/dev/key
SOURCE
/sys/src/cmd/auth/passwd.c
/sys/src/cmd/auth/netkey.c
SEE ALSO
Page 1 Plan 9 (printed 12/26/24)
PASSWD(1) PASSWD(1)
encrypt(2), cons(3), securenet(8)
Robert Morris and Ken Thompson, ``UNIX Password Security,''
AT&T Bell Laboratories Technical Journal Vol 63 (1984), pp.
1649-1672
Page 2 Plan 9 (printed 12/26/24)