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174 lines
4.9 KiB
Groff
174 lines
4.9 KiB
Groff
.\" opiekey.1: Manual page for the opiekey(1) program.
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.\"
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.\" %%% portions-copyright-cmetz-96
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.\" Portions of this software are Copyright 1996-1997 by Craig Metz, All Rights
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.\" Reserved. The Inner Net License Version 2 applies to these portions of
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.\" the software.
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.\" You should have received a copy of the license with this software. If
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.\" you didn't get a copy, you may request one from <license@inner.net>.
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.\"
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.\" Portions of this software are Copyright 1995 by Randall Atkinson and Dan
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.\" McDonald, All Rights Reserved. All Rights under this copyright are assigned
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.\" to the U.S. Naval Research Laboratory (NRL). The NRL Copyright Notice and
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.\" License Agreement applies to this software.
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.\"
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.\" History:
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.\"
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.\" Modified by cmetz for OPIE 2.3. Added -t documentation. Removed
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.\" opie-bugs pointer. Removed opie-md5 and opie-md4 names. Fixed
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.\" a bolding bug. Added -f flag. Added escapes on flags. Minor
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.\" editorial changes. Updated example.
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.\" Modified by cmetz for OPIE 2.2. Removed MJR DES documentation.
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.\" Re-worded retype documentation. Added opiegen reference.
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.\" Added -x documentation.
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.\" Modified at NRL for OPIE 2.0.
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.\" Written at Bellcore for the S/Key Version 1 software distribution
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.\" (key.1).
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.\"
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.ll 6i
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.pl 10.5i
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.lt 6.0i
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.TH OPIEKEY 1 "February 20, 1996"
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.AT 3
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.SH NAME
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opiekey, otp-md4, otp-md5 \- Programs for computing responses to OTP challenges.
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.SH SYNOPSIS
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.B opiekey
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.B otp-md4
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.B otp-md5
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[\-v] [\-h] [\-f] [\-x]
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.sp 0
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[\-t
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.I
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type
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] [\-4|\-5]
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[\-a] [\-n
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.I count
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]
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.I sequence_number seed
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.sp 0
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.SH DESCRIPTION
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.I opiekey
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takes the optional count of the number of responses to
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print along with a (maximum) sequence number and seed as command line
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args. It prompts for the user's secret pass phrase and produces an OPIE
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response as six words. If compiled to do so, it can prompt for the user's
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secret pass phrase twice to help reduce errors due to mistypes. The second
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password entry can be circumvented by entering only an end of line.
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.I opiekey
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is downward compatible with the
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.IR key (1)
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program from the Bellcore S/Key Version 1 distribution and several of its
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variants.
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.SH OPTIONS
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.TP
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.B \-v
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Display the version number and compile-time options, then exit.
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.TP
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.B \-h
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Display a brief help message and exit.
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.TP
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.B \-4, \-5
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Selects MD4 or MD5, respectively, as the response generation algorithm. The
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default for otp-md4 is MD4 and the default for opie-md5 is MD5. The default
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for opiekey depends on compile-time configuration, but should be MD5. MD4 is
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compatible with the Bellcore S/Key Version 1 distribution.
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.TP
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.B \-f
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Force
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.I opiekey
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to continue, even where it normally shouldn't. This is currently used to
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force opiekey to operate in even from terminals it believes to be insecure.
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It can also allow users to disclose their secret pass phrases to attackers.
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Use of the -f flag may be disabled by compile-time option in your particular
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build of OPIE.
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.TP
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.B \-a
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Allows you to input an arbitrary secret pass phrase, instead of running checks
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against it. Arbitrary currently does not include '\0' or '\n' characters. This
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can be used for backwards compatibility with key generators that do not check
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passwords.
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.TP
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.B \-n <count>
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the number of one time access passwords to print.
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The default is one.
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.TP
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.B \-x
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Output the OTPs as hexadecimal numbers instead of six words.
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.TP
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.B \-t <type>
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Generate an extended response of the specified type. Supported types are:
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.sp 1
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word six-word
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.sp 0
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hex hexadecimal
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.sp 0
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init hexadecimal re-initialization
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.sp 0
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init-word six-word re-initialization
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.sp 1
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The re-initialization responses
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.I always
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generate the simple active attack protection.
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.TP
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.SH EXAMPLE
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.sp 0
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wintermute$ opiekey \-5 \-n 5 495 wi01309
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.sp 0
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Using MD5 algorithm to compute response.
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.sp 0
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Reminder: Don't use opiekey from telnet or dial-in sessions.
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.sp 0
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Enter secret pass phrase:
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.sp 0
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491: HOST VET FOWL SEEK IOWA YAP
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.sp 0
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492: JOB ARTS WERE FEAT TILE IBIS
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.sp 0
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493: TRUE BRED JOEL USER HALT EBEN
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.sp 0
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494: HOOD WED MOLT PAN FED RUBY
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.sp 0
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495: SUB YAW BILE GLEE OWE NOR
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.sp 0
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wintermute$
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.LP
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.SH BUGS
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.BR opiekey(1)
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can lull a user into revealing his/her password when remotely logged in, thus
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defeating the purpose of OPIE. This is especially a problem with xterm.
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.BR opiekey(1)
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implements simple checks to reduce the risk of a user making
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this mistake. Better checks are needed.
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.LP
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.SH SEE ALSO
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.BR ftpd (8),
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.BR login (1),
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.BR opie (4),
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.BR opiepasswd (1),
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.BR opieinfo (1),
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.BR opiekeys (5),
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.BR opieaccess (5),
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.BR opiegen (1)
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.BR su (1),
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.SH AUTHOR
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Bellcore's S/Key was written by Phil Karn, Neil M. Haller, and John S. Walden
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of Bellcore. OPIE was created at NRL by Randall Atkinson, Dan McDonald, and
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Craig Metz.
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S/Key is a trademark of Bell Communications Research (Bellcore).
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.SH CONTACT
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OPIE is discussed on the Bellcore "S/Key Users" mailing list. To join,
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send an email request to:
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.sp
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skey-users-request@thumper.bellcore.com
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