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-.\" Copyright (c) 1996
-.\" David L. Nugent. All Rights reserved.
-.\" 
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 
-.\" THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd December 22, 1996
-.Dt SKEY 3
-.Os
-.Sh NAME
-.Nm skeylookup ,
-.Nm skeyverify ,
-.Nm skeychallenge ,
-.Nm skeyinfo ,
-.Nm skeyaccess ,
-.Nm skey_getpass ,
-.Nm skey_crypt
-.Nd library routines for S/Key password control table access
-.Sh LIBRARY
-.Lb libskey
-.Sh SYNOPSIS
-.Fd #include <stdio.h>
-.Fd #include <skey.h>
-.Ft int
-.Fn skeylookup "struct skey *mp" "const char *name"
-.Ft int
-.Fn skeyverify "struct skey *mp" "char *response"
-.Ft int
-.Fn skeychallenge "struct skey *mp" "const char *name" "char *challenge"
-.Ft int
-.Fn skeyinfo "struct skey *mp" "const char *name" "char *ss"
-.Ft int
-.Fn skeyaccess "char *user" "const char *port" "const char *host" "const char *addr"
-.Ft char *
-.Fn skey_getpass "const char *prompt" "struct passwd *pwd" "int pwok"
-.Ft const char *
-.Fn skey_crypt "char *pp" "char *salt" "struct passwd *pwd" "int pwok"
-.Sh DESCRIPTION
-These routes support the S/Key one time password system used for
-accessing computer systems.
-See
-.Xr skey 1 
-for more information about the S/Key system itself.
-.Pp
-.Pp
-.Fn skeylookup
-finds an entry in the one-time password database.
-On success (an entry is found corresponding to the given name),
-they skey structure passed by the caller is filled and 0 is
-returned, with the file read/write pointer positioned at the
-beginning of the record found.
-If no entry is found corresponding to the given name, the file
-read/write pointer is positioned at end of file and the routine
-returns 1.
-If the database cannot be opened or an access error occurs,
-.Fn skeylookup
-returns -1.
-.Pp
-The
-.Fn skeyinfo
-function looks up skey info for user 'name'.
-If successful, the caller's skey structure is filled and
-.Fn skeyinfo
-returns 0.
-If an optional challenge string buffer is given, it is updated.
-If unsuccessful (e.g. if the name is unknown, or the database
-cannot be accessed) -1 is returned.
-.Pp
-.Fn skeychallenge
-returns an skey challenge string for 'name'.
-If successful, the caller's skey structure is filled, and
-the function returns 0, with the file read/write pointer
-left at the start of the record.
-If unsuccessful (ie. the name was not found), the function
-returns -1 and the database is closed.
-.Pp
-.Fn skeyverify
-verifies a response to an s/key challenge.
-If this function returns 0, the verify was successful and
-the database was updated.
-If 1 is returned, the verify failed and the database remains
-unchanged.
-If -1 is returned, some sort of error occurred with the database,
-and the database is left unchanged.
-The s/key database is always closed by this call.
-.Pp
-The
-.Fn skey_getpass
-function may be used to read regular or s/key passwords.
-The prompt to use is passed to the function, along with the
-full (secure) struct passwd for the user to be verified.
-.Fn skey_getpass
-uses the standard library getpass on the first attempt at
-retrieving the user's password, and if that is blank, turns
-echo back on and retrieves the S/Key password.
-In either case, the entered string is returned back to the
-caller.
-.Pp
-The
-.Fn skey_crypt
-is a wrapper function for the standard library
-.Xr crypt 3 ,
-which returns the encrypted UNIX password if either the given
-s/key or regular passwords are ok.
-.Fn skey_crypt
-first attempts verification of the given password via the skey
-method, and will return the encrypted password from the
-passwd structure if it can be verified, as though the user had
-actually entered the correct UNIX password.
-If s/key password verification does not work, then the password
-is encrypted in the usual way and the result passed back to the
-caller.
-If the passwd structure pointer is NULL,
-.Fn skey_crypt
-returns a non-NULL string which could not possibly be a valid
-UNIX password (namely, a string containing ":").
-.Pp
-The
-.Fn skeyaccess
-function determines whether traditional UNIX (non-S/Key) passwords
-are permitted for any combination of user name, group member,
-terminal port, host name, and network.  If UNIX passwords are allowed,
-.Fn skeyaccess
-returns a non-zero value.  If UNIX passwords are not allowed, it
-returns 0.  See
-.Xr skey.access 5
-for more information on the layout and structure of the
-skey.access configuration file which this function uses.
-.Sh RETURN VALUES
-See above.
-.Sh SEE ALSO
-.Xr skey 1 ,
-.Xr skey.access 5
-.Sh BUGS
-No advisory locking is done on the s/key database to guard against
-simultaneous access from multiple processes.
-This is not normally a problem when keys are added to or updated
-in the file, but may be problematic when keys are removed.
-.Sh AUTHORS
-.An Phil Karn ,
-.An Neil M. Haller ,
-.An John S. Walden ,
-.An Scott Chasin