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- .TH PASSWD 1
- .SH NAME
- passwd, netkey, iam \- change user password
- .SH SYNOPSIS
- .B passwd
- [
- .I username\fR[@\fPdomain\fR]\fP
- ]
- .PP
- .B netkey
- .PP
- .B auth/iam
- [
- .I username
- ]
- .SH DESCRIPTION
- .I 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 services:
- POP3, IMAP, and VPN access. The optional argument specifies
- the user name and authentication domain to use if different
- than the one associated with the machine
- .I passwd
- is run on.
- .PP
- The program first prompts for the old Plan 9 password in the specified
- domain 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 be of any length greater than seven characters.
- .PP
- .I Netkey
- uses the password to encrypt network challenges.
- It is a substitute for a SecureNet box.
- .PP
- These commands may be run only on a terminal, to avoid
- transmitting clear text passwords over the network.
- .PP
- .I Auth/iam
- can be run only by the the host owner (the user specified as the contents of
- .BR /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
- .LR tor ,
- you may later change identity to
- .LR supertor .
- If the host owner changes, all processes running as the host owner
- also change their identity to the new user id.
- .PP
- Without an argument,
- .I 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.
- .SH FILES
- .B /dev/key
- .SH SOURCE
- .B /sys/src/cmd/auth/passwd.c
- .br
- .B /sys/src/cmd/auth/netkey.c
- .SH "SEE ALSO"
- .IR encrypt (2),
- .IR cons (3),
- .IR securenet (8)
- .PP
- Robert Morris and Ken Thompson,
- ``UNIX Password Security,''
- .I AT&T Bell Laboratories Technical Journal
- Vol 63 (1984), pp. 1649-1672
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