.\"	$OpenBSD: skeyinit.1,v 1.30 2004/06/07 19:22:20 otto Exp $
.\"	$NetBSD: skeyinit.1,v 1.4 1995/07/07 22:24:09 jtc Exp $
.\"	@(#)skeyinit.1	1.1 	10/28/93
.\"
.Dd February 24, 1998
.Dt SKEYINIT 1
.Os
.Sh NAME
.Nm skeyinit
.Nd change password or add user to S/Key authentication system
.Sh SYNOPSIS
.Nm skeyinit
.Op Fl r
.Op Fl s
.Op Fl x
.Op Fl C
.Op Fl D
.Op Fl E
.Op Fl a Ar auth-type
.Op Fl n Ar count
.Oo
.Fl md4 | Fl md5 | Fl sha1 |
.Fl rmd160
.Oc
.Op Ar user
.Sh DESCRIPTION
.Nm
initializes the system so you can use S/Key one-time passwords to log in.
The program will ask you to enter a secret passphrase which is used by
.Xr skey 1
to generate one-time passwords;
enter a phrase of several words in response.
After the S/Key database
has been updated you can log in using either your regular password
or using S/Key one-time passwords.
.Pp
.Nm
requires you to type a secret passphrase, so it should be used
only on a secure terminal.
For example, on the console of a
workstation or over an encrypted network session.
If you are using
.Nm
while logged in over an untrusted network, follow the instructions
given below with the
.Fl s
option.
.Pp
Before initializing an S/Key entry, the user must authenticate
using either a standard password or an S/Key challenge.
To use a one-time password for initial authentication, the
.Dq Fl a Li skey
option can be used.
The user will then be presented with the standard
S/Key challenge and allowed to proceed if it is correct.
.Pp
.Nm
prints a sequence number and a one-time password.
This password can not be used to log in; one-time passwords should be
generated using
.Xr skey 1
first.
The one-time password printed by
.Nm
can be used to verify if the right passphrase has been given to
.Xr skey 1 .
The one-time password with the corresponding sequence number printed by
.Xr skey 1
should match the one printed by
.Nm .
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl C
Converts from the old-style
.Pa /etc/skeykeys
database to a new-style database where user records are stored in the
.Pa /etc/skey
directory.
If an entry already exists in the new-style database it will not
be overwritten.
.It Fl D
Disables access to the S/Key database.
Only the superuser may use the
.Fl D
option.
.It Fl E
Enables access to the S/Key database.
Only the superuser may use the
.Fl E
option.
.It Fl r
Removes the user's S/Key entry.
.It Fl s
Set secure mode where the user is expected to have used a secure
machine to generate the first one-time password.
Without the
.Fl s
option the system will assume you are directly connected over secure
communications and prompt you for your secret passphrase.
The
.Fl s
option also allows one to set the seed and count for complete
control of the parameters.
You can use
.Ic skeyinit -s
in combination with the
.Nm skey
command to set the seed and count if you do not like the defaults.
To do this run
.Nm
in one window and put in your count and seed, then run
.Nm skey
in another window to generate the correct 6 English words for that
count and seed.
You can then "cut-and-paste" or type the words into the
.Nm
window.
When the
.Fl s
option is specified,
.Nm
will try to authenticate the user via S/Key, instead of the default listed in
.Pa /etc/login.conf .
If a user has no entry in the S/Key database, an alternate authentication
type must be specified via the
.Fl a
option.
Please note that entering a password or passphrase in plain text
defeats the purpose of using
.Dq secure
mode.
.It Fl x
Displays one-time password in hexadecimal instead of ASCII.
.It Fl a Ar auth-type
Specify an authentication type such as
.Dq krb5 ,
.Dq passwd
or
.Dq skey .
.It Fl n Ar count
Start the
.Nm skey
sequence at
.Ar count
(default is 100).
.It Fl md4
Selects MD4 as the hash algorithm.
.It Fl md5
Selects MD5 as the hash algorithm.
.It Fl sha1
Selects SHA (NIST Secure Hash Algorithm Revision 1) as the hash algorithm.
.It Fl rmd160
Selects RMD-160 (160 bit Ripe Message Digest) as the hash algorithm.
.It Ar user
The username to be changed/added.
By default the current user is operated on.
.El
.Sh FILES
.Bl -tag -width /etc/login.conf -compact
.It Pa /etc/login.conf
file containing authentication types
.It Pa /etc/skey
directory containing user entries for S/Key
.El
.Sh EXAMPLES
.Bd -literal
$ skeyinit
Reminder - Only use this method if you are directly connected
           or have an encrypted channel.  If you are using telnet,
           hit return now and use skeyinit -s.
Password: <enter your regular password here>
[Updating user with md5]
Old seed: [md5] host12377
Enter new secret passphrase: <type a new passphrase here>
Again secret passphrase: <again>
ID user skey is otp-md5 100 host12378
Next login password: CITE BREW IDLE CAIN ROD DOME
$ otp-md5 -n 3 100 host12378
Reminder - Do not use this program while logged in via telnet.
Enter secret passphrase: <type your passphrase here>
98: WERE TUG EDDY GEAR GILL TEE
99: NEAR HA TILT FIN LONG SNOW
100: CITE BREW IDLE CAIN ROD DOME
.Ed
.Pp
The one-time password for the next login will have sequence number 99.
.Sh ERRORS
.Bl -tag -compact -width "skey disabled"
.It "skey disabled"
.Pa /etc/skey
does not exist or is not accessible by the user.
The superuser may enable
.Nm
via the
.Fl E
flag.
.El
.Sh SEE ALSO
.Xr skey 1 ,
.Xr skeyaudit 1 ,
.Xr skeyinfo 1 ,
.Xr skeyprune 8
.Sh AUTHORS
Phil Karn, Neil M. Haller, John S. Walden, Scott Chasin, Todd Miller