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.\" $Id: srp-entry.8,v 1.2 2004/11/13 12:22:49 paulus Exp $
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.TH SRP-ENTRY 8
.SH NAME
srp\-entry \- Generate a SRP\-SHA1 Server Entry
.SH SYNOPSIS
.B srp\-entry
[
.I \-i index
] [
.I clientname
]
.SH DESCRIPTION
.LP
This utility generates an entry suitable for use in the
/etc/ppp/srp\-secrets file on a PPP EAP SRP\-SHA1 authenticator
("server").  This file has the same basic layout as the other pppd(8)
authentication files, /etc/ppp/pap\-secrets and /etc/ppp/chap\-secrets.
Thus, the entry generated has at least four main fields separated by
spaces.  The first field is the authenticatee ("client") name.  The
second is the server name.  The third is the secret.  The fourth is
the allowed (or assigned) IP address for the client, and defaults to
"*".  Additional fields can contain additional IP addresses or pppd
options; see pppd(8) for details.
.LP
The third field has three subfields, separated by colons.  The first
subfield is the index of the modulus and generator from SRP's
/etc/tpasswd.conf.  The special value 0 is used to represent the
well-known modulus and generator specified in the EAP SRP\-SHA1 draft.
The second subfield is the password validator.  The third is the
password salt.  These latter two values are encoded in base64 notation.
.SH OPTIONS
.TP
.I \-i <index>
Specifies the modulus/generator index in /etc/tpasswd.conf.  In order
to use this option, you will need to run the "tconf" utility from the
SRP package to generate local entries for this file.  Note that if
these values are not known to the client, the client will be forced to
run time-consuming safety tests on the values used.  For this reason,
using the well-known values is recommended.
.TP
.I <clientname>
Specifies the client name.  The password validator is a hashed
combination of the client's name and password, and both are required.
If the client name is not supplied on the command line, srp\-entry will
prompt for the client name first.
.SH FILES
.TP
.B /etc/ppp/srp\-secrets
Usernames, passwords and IP addresses for SRP authentication.  This
file should be owned by root and not readable or writable by any other
user.  Pppd will log a warning if this is not the case.  Note that
srp\-entry does not write to this file.  The user is responsible for
copying the output of srp\-entry into this file.
.TP
.B /etc/tpasswd.conf
Indexed copies of tested modulus/generator combinations; part of the
SRP package.
.SH SEE ALSO
.TP
pppd(8)
.TP
.B RFC2284
Blunk, L., Vollbrecht, J.,
.I PPP Extensible Authentication Protocol (EAP).
March 1998.
.TP
.B draft\-ietf\-pppext\-eap\-srp\-03.txt
Carlson, J., et al.,
.I EAP SRP\-SHA1 Authentication Protocol.
July 2001.
.TP
.B RFC2945
Wu, T.,
.I The SRP Authentication and Key Exchange System
September 2000.
.SH AUTHOR
James Carlson (james.d.carlson@sun.com)