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683 lines
15 KiB
683 lines
15 KiB
/*
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* upap.c - User/Password Authentication Protocol.
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*
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* Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The name "Carnegie Mellon University" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For permission or any legal
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* details, please contact
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* Office of Technology Transfer
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* Carnegie Mellon University
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* 5000 Forbes Avenue
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* Pittsburgh, PA 15213-3890
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* (412) 268-4387, fax: (412) 268-7395
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* tech-transfer@andrew.cmu.edu
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*
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* 4. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by Computing Services
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* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
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*
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* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
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* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
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* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#define RCSID "$Id: upap.c,v 1.30 2005/07/13 10:41:58 paulus Exp $"
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/*
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* TODO:
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*/
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#include <stdio.h>
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#include <string.h>
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#include "pppd.h"
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#include "upap.h"
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static const char rcsid[] = RCSID;
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static bool hide_password = 1;
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/*
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* Command-line options.
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*/
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static option_t pap_option_list[] = {
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{ "hide-password", o_bool, &hide_password,
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"Don't output passwords to log", OPT_PRIO | 1 },
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{ "show-password", o_bool, &hide_password,
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"Show password string in debug log messages", OPT_PRIOSUB | 0 },
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{ "pap-restart", o_int, &upap[0].us_timeouttime,
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"Set retransmit timeout for PAP", OPT_PRIO },
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{ "pap-max-authreq", o_int, &upap[0].us_maxtransmits,
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"Set max number of transmissions for auth-reqs", OPT_PRIO },
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{ "pap-timeout", o_int, &upap[0].us_reqtimeout,
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"Set time limit for peer PAP authentication", OPT_PRIO },
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{ NULL }
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};
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/*
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* Protocol entry points.
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*/
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static void upap_init __P((int));
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static void upap_lowerup __P((int));
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static void upap_lowerdown __P((int));
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static void upap_input __P((int, u_char *, int));
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static void upap_protrej __P((int));
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static int upap_printpkt __P((u_char *, int,
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void (*) __P((void *, char *, ...)), void *));
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struct protent pap_protent = {
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PPP_PAP,
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upap_init,
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upap_input,
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upap_protrej,
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upap_lowerup,
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upap_lowerdown,
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NULL,
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NULL,
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upap_printpkt,
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NULL,
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1,
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"PAP",
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NULL,
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pap_option_list,
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NULL,
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NULL,
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NULL
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};
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upap_state upap[NUM_PPP]; /* UPAP state; one for each unit */
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static void upap_timeout __P((void *));
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static void upap_reqtimeout __P((void *));
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static void upap_rauthreq __P((upap_state *, u_char *, int, int));
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static void upap_rauthack __P((upap_state *, u_char *, int, int));
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static void upap_rauthnak __P((upap_state *, u_char *, int, int));
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static void upap_sauthreq __P((upap_state *));
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static void upap_sresp __P((upap_state *, int, int, char *, int));
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/*
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* upap_init - Initialize a UPAP unit.
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*/
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static void
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upap_init(unit)
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int unit;
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{
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upap_state *u = &upap[unit];
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u->us_unit = unit;
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u->us_user = NULL;
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u->us_userlen = 0;
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u->us_passwd = NULL;
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u->us_passwdlen = 0;
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u->us_clientstate = UPAPCS_INITIAL;
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u->us_serverstate = UPAPSS_INITIAL;
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u->us_id = 0;
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u->us_timeouttime = UPAP_DEFTIMEOUT;
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u->us_maxtransmits = 10;
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u->us_reqtimeout = UPAP_DEFREQTIME;
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}
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/*
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* upap_authwithpeer - Authenticate us with our peer (start client).
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*
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* Set new state and send authenticate's.
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*/
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void
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upap_authwithpeer(unit, user, password)
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int unit;
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char *user, *password;
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{
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upap_state *u = &upap[unit];
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/* Save the username and password we're given */
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u->us_user = user;
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u->us_userlen = strlen(user);
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u->us_passwd = password;
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u->us_passwdlen = strlen(password);
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u->us_transmits = 0;
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/* Lower layer up yet? */
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if (u->us_clientstate == UPAPCS_INITIAL ||
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u->us_clientstate == UPAPCS_PENDING) {
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u->us_clientstate = UPAPCS_PENDING;
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return;
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}
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upap_sauthreq(u); /* Start protocol */
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}
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/*
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* upap_authpeer - Authenticate our peer (start server).
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*
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* Set new state.
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*/
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void
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upap_authpeer(unit)
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int unit;
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{
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upap_state *u = &upap[unit];
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/* Lower layer up yet? */
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if (u->us_serverstate == UPAPSS_INITIAL ||
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u->us_serverstate == UPAPSS_PENDING) {
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u->us_serverstate = UPAPSS_PENDING;
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return;
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}
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u->us_serverstate = UPAPSS_LISTEN;
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if (u->us_reqtimeout > 0)
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TIMEOUT(upap_reqtimeout, u, u->us_reqtimeout);
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}
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/*
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* upap_timeout - Retransmission timer for sending auth-reqs expired.
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*/
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static void
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upap_timeout(arg)
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void *arg;
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{
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upap_state *u = (upap_state *) arg;
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if (u->us_clientstate != UPAPCS_AUTHREQ)
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return;
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if (u->us_transmits >= u->us_maxtransmits) {
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/* give up in disgust */
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error("No response to PAP authenticate-requests");
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u->us_clientstate = UPAPCS_BADAUTH;
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auth_withpeer_fail(u->us_unit, PPP_PAP);
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return;
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}
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upap_sauthreq(u); /* Send Authenticate-Request */
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}
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/*
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* upap_reqtimeout - Give up waiting for the peer to send an auth-req.
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*/
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static void
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upap_reqtimeout(arg)
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void *arg;
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{
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upap_state *u = (upap_state *) arg;
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if (u->us_serverstate != UPAPSS_LISTEN)
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return; /* huh?? */
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auth_peer_fail(u->us_unit, PPP_PAP);
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u->us_serverstate = UPAPSS_BADAUTH;
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}
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/*
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* upap_lowerup - The lower layer is up.
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*
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* Start authenticating if pending.
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*/
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static void
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upap_lowerup(unit)
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int unit;
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{
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upap_state *u = &upap[unit];
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if (u->us_clientstate == UPAPCS_INITIAL)
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u->us_clientstate = UPAPCS_CLOSED;
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else if (u->us_clientstate == UPAPCS_PENDING) {
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upap_sauthreq(u); /* send an auth-request */
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}
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if (u->us_serverstate == UPAPSS_INITIAL)
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u->us_serverstate = UPAPSS_CLOSED;
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else if (u->us_serverstate == UPAPSS_PENDING) {
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u->us_serverstate = UPAPSS_LISTEN;
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if (u->us_reqtimeout > 0)
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TIMEOUT(upap_reqtimeout, u, u->us_reqtimeout);
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}
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}
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/*
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* upap_lowerdown - The lower layer is down.
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*
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* Cancel all timeouts.
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*/
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static void
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upap_lowerdown(unit)
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int unit;
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{
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upap_state *u = &upap[unit];
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if (u->us_clientstate == UPAPCS_AUTHREQ) /* Timeout pending? */
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UNTIMEOUT(upap_timeout, u); /* Cancel timeout */
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if (u->us_serverstate == UPAPSS_LISTEN && u->us_reqtimeout > 0)
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UNTIMEOUT(upap_reqtimeout, u);
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u->us_clientstate = UPAPCS_INITIAL;
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u->us_serverstate = UPAPSS_INITIAL;
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}
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/*
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* upap_protrej - Peer doesn't speak this protocol.
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*
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* This shouldn't happen. In any case, pretend lower layer went down.
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*/
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static void
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upap_protrej(unit)
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int unit;
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{
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upap_state *u = &upap[unit];
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if (u->us_clientstate == UPAPCS_AUTHREQ) {
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error("PAP authentication failed due to protocol-reject");
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auth_withpeer_fail(unit, PPP_PAP);
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}
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if (u->us_serverstate == UPAPSS_LISTEN) {
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error("PAP authentication of peer failed (protocol-reject)");
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auth_peer_fail(unit, PPP_PAP);
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}
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upap_lowerdown(unit);
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}
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/*
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* upap_input - Input UPAP packet.
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*/
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static void
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upap_input(unit, inpacket, l)
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int unit;
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u_char *inpacket;
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int l;
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{
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upap_state *u = &upap[unit];
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u_char *inp;
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u_char code, id;
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int len;
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/*
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* Parse header (code, id and length).
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* If packet too short, drop it.
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*/
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inp = inpacket;
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if (l < UPAP_HEADERLEN) {
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UPAPDEBUG(("pap_input: rcvd short header."));
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return;
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}
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GETCHAR(code, inp);
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GETCHAR(id, inp);
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GETSHORT(len, inp);
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if (len < UPAP_HEADERLEN) {
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UPAPDEBUG(("pap_input: rcvd illegal length."));
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return;
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}
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if (len > l) {
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UPAPDEBUG(("pap_input: rcvd short packet."));
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return;
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}
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len -= UPAP_HEADERLEN;
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/*
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* Action depends on code.
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*/
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switch (code) {
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case UPAP_AUTHREQ:
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upap_rauthreq(u, inp, id, len);
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break;
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case UPAP_AUTHACK:
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upap_rauthack(u, inp, id, len);
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break;
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case UPAP_AUTHNAK:
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upap_rauthnak(u, inp, id, len);
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break;
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default: /* XXX Need code reject */
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break;
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}
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}
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/*
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* upap_rauth - Receive Authenticate.
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*/
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static void
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upap_rauthreq(u, inp, id, len)
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upap_state *u;
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u_char *inp;
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int id;
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int len;
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{
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u_char ruserlen, rpasswdlen;
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char *ruser, *rpasswd;
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char rhostname[256];
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int retcode;
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char *msg;
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int msglen;
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if (u->us_serverstate < UPAPSS_LISTEN)
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return;
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/*
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* If we receive a duplicate authenticate-request, we are
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* supposed to return the same status as for the first request.
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*/
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if (u->us_serverstate == UPAPSS_OPEN) {
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upap_sresp(u, UPAP_AUTHACK, id, "", 0); /* return auth-ack */
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return;
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}
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if (u->us_serverstate == UPAPSS_BADAUTH) {
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upap_sresp(u, UPAP_AUTHNAK, id, "", 0); /* return auth-nak */
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return;
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}
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/*
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* Parse user/passwd.
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*/
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if (len < 1) {
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UPAPDEBUG(("pap_rauth: rcvd short packet."));
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return;
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}
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GETCHAR(ruserlen, inp);
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len -= sizeof (u_char) + ruserlen + sizeof (u_char);
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if (len < 0) {
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UPAPDEBUG(("pap_rauth: rcvd short packet."));
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return;
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}
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ruser = (char *) inp;
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INCPTR(ruserlen, inp);
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GETCHAR(rpasswdlen, inp);
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if (len < rpasswdlen) {
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UPAPDEBUG(("pap_rauth: rcvd short packet."));
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return;
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}
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rpasswd = (char *) inp;
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/*
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* Check the username and password given.
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*/
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retcode = check_passwd(u->us_unit, ruser, ruserlen, rpasswd,
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rpasswdlen, &msg);
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BZERO(rpasswd, rpasswdlen);
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/*
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* Check remote number authorization. A plugin may have filled in
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* the remote number or added an allowed number, and rather than
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* return an authenticate failure, is leaving it for us to verify.
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*/
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if (retcode == UPAP_AUTHACK) {
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if (!auth_number()) {
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/* We do not want to leak info about the pap result. */
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retcode = UPAP_AUTHNAK; /* XXX exit value will be "wrong" */
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warn("calling number %q is not authorized", remote_number);
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}
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}
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msglen = strlen(msg);
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if (msglen > 255)
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msglen = 255;
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upap_sresp(u, retcode, id, msg, msglen);
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/* Null terminate and clean remote name. */
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slprintf(rhostname, sizeof(rhostname), "%.*v", ruserlen, ruser);
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if (retcode == UPAP_AUTHACK) {
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u->us_serverstate = UPAPSS_OPEN;
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notice("PAP peer authentication succeeded for %q", rhostname);
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auth_peer_success(u->us_unit, PPP_PAP, 0, ruser, ruserlen);
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} else {
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u->us_serverstate = UPAPSS_BADAUTH;
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warn("PAP peer authentication failed for %q", rhostname);
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auth_peer_fail(u->us_unit, PPP_PAP);
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}
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if (u->us_reqtimeout > 0)
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UNTIMEOUT(upap_reqtimeout, u);
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}
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/*
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* upap_rauthack - Receive Authenticate-Ack.
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*/
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static void
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upap_rauthack(u, inp, id, len)
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upap_state *u;
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u_char *inp;
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int id;
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int len;
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{
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u_char msglen;
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char *msg;
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if (u->us_clientstate != UPAPCS_AUTHREQ) /* XXX */
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return;
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/*
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* Parse message.
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*/
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if (len < 1) {
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UPAPDEBUG(("pap_rauthack: ignoring missing msg-length."));
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} else {
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GETCHAR(msglen, inp);
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if (msglen > 0) {
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len -= sizeof (u_char);
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if (len < msglen) {
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UPAPDEBUG(("pap_rauthack: rcvd short packet."));
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return;
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}
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msg = (char *) inp;
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PRINTMSG(msg, msglen);
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}
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}
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u->us_clientstate = UPAPCS_OPEN;
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auth_withpeer_success(u->us_unit, PPP_PAP, 0);
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}
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/*
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* upap_rauthnak - Receive Authenticate-Nak.
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*/
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static void
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upap_rauthnak(u, inp, id, len)
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upap_state *u;
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u_char *inp;
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int id;
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int len;
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{
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u_char msglen;
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char *msg;
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if (u->us_clientstate != UPAPCS_AUTHREQ) /* XXX */
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return;
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/*
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* Parse message.
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*/
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if (len < 1) {
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UPAPDEBUG(("pap_rauthnak: ignoring missing msg-length."));
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} else {
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GETCHAR(msglen, inp);
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if (msglen > 0) {
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len -= sizeof (u_char);
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if (len < msglen) {
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UPAPDEBUG(("pap_rauthnak: rcvd short packet."));
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return;
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}
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msg = (char *) inp;
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PRINTMSG(msg, msglen);
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}
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}
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u->us_clientstate = UPAPCS_BADAUTH;
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error("PAP authentication failed");
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auth_withpeer_fail(u->us_unit, PPP_PAP);
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}
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/*
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* upap_sauthreq - Send an Authenticate-Request.
|
|
*/
|
|
static void
|
|
upap_sauthreq(u)
|
|
upap_state *u;
|
|
{
|
|
u_char *outp;
|
|
int outlen;
|
|
|
|
outlen = UPAP_HEADERLEN + 2 * sizeof (u_char) +
|
|
u->us_userlen + u->us_passwdlen;
|
|
outp = outpacket_buf;
|
|
|
|
MAKEHEADER(outp, PPP_PAP);
|
|
|
|
PUTCHAR(UPAP_AUTHREQ, outp);
|
|
PUTCHAR(++u->us_id, outp);
|
|
PUTSHORT(outlen, outp);
|
|
PUTCHAR(u->us_userlen, outp);
|
|
BCOPY(u->us_user, outp, u->us_userlen);
|
|
INCPTR(u->us_userlen, outp);
|
|
PUTCHAR(u->us_passwdlen, outp);
|
|
BCOPY(u->us_passwd, outp, u->us_passwdlen);
|
|
|
|
output(u->us_unit, outpacket_buf, outlen + PPP_HDRLEN);
|
|
|
|
TIMEOUT(upap_timeout, u, u->us_timeouttime);
|
|
++u->us_transmits;
|
|
u->us_clientstate = UPAPCS_AUTHREQ;
|
|
}
|
|
|
|
|
|
/*
|
|
* upap_sresp - Send a response (ack or nak).
|
|
*/
|
|
static void
|
|
upap_sresp(u, code, id, msg, msglen)
|
|
upap_state *u;
|
|
u_char code, id;
|
|
char *msg;
|
|
int msglen;
|
|
{
|
|
u_char *outp;
|
|
int outlen;
|
|
|
|
outlen = UPAP_HEADERLEN + sizeof (u_char) + msglen;
|
|
outp = outpacket_buf;
|
|
MAKEHEADER(outp, PPP_PAP);
|
|
|
|
PUTCHAR(code, outp);
|
|
PUTCHAR(id, outp);
|
|
PUTSHORT(outlen, outp);
|
|
PUTCHAR(msglen, outp);
|
|
BCOPY(msg, outp, msglen);
|
|
output(u->us_unit, outpacket_buf, outlen + PPP_HDRLEN);
|
|
}
|
|
|
|
/*
|
|
* upap_printpkt - print the contents of a PAP packet.
|
|
*/
|
|
static char *upap_codenames[] = {
|
|
"AuthReq", "AuthAck", "AuthNak"
|
|
};
|
|
|
|
static int
|
|
upap_printpkt(p, plen, printer, arg)
|
|
u_char *p;
|
|
int plen;
|
|
void (*printer) __P((void *, char *, ...));
|
|
void *arg;
|
|
{
|
|
int code, id, len;
|
|
int mlen, ulen, wlen;
|
|
char *user, *pwd, *msg;
|
|
u_char *pstart;
|
|
|
|
if (plen < UPAP_HEADERLEN)
|
|
return 0;
|
|
pstart = p;
|
|
GETCHAR(code, p);
|
|
GETCHAR(id, p);
|
|
GETSHORT(len, p);
|
|
if (len < UPAP_HEADERLEN || len > plen)
|
|
return 0;
|
|
|
|
if (code >= 1 && code <= sizeof(upap_codenames) / sizeof(char *))
|
|
printer(arg, " %s", upap_codenames[code-1]);
|
|
else
|
|
printer(arg, " code=0x%x", code);
|
|
printer(arg, " id=0x%x", id);
|
|
len -= UPAP_HEADERLEN;
|
|
switch (code) {
|
|
case UPAP_AUTHREQ:
|
|
if (len < 1)
|
|
break;
|
|
ulen = p[0];
|
|
if (len < ulen + 2)
|
|
break;
|
|
wlen = p[ulen + 1];
|
|
if (len < ulen + wlen + 2)
|
|
break;
|
|
user = (char *) (p + 1);
|
|
pwd = (char *) (p + ulen + 2);
|
|
p += ulen + wlen + 2;
|
|
len -= ulen + wlen + 2;
|
|
printer(arg, " user=");
|
|
print_string(user, ulen, printer, arg);
|
|
printer(arg, " password=");
|
|
if (!hide_password)
|
|
print_string(pwd, wlen, printer, arg);
|
|
else
|
|
printer(arg, "<hidden>");
|
|
break;
|
|
case UPAP_AUTHACK:
|
|
case UPAP_AUTHNAK:
|
|
if (len < 1)
|
|
break;
|
|
mlen = p[0];
|
|
if (len < mlen + 1)
|
|
break;
|
|
msg = (char *) (p + 1);
|
|
p += mlen + 1;
|
|
len -= mlen + 1;
|
|
printer(arg, " ");
|
|
print_string(msg, mlen, printer, arg);
|
|
break;
|
|
}
|
|
|
|
/* print the rest of the bytes in the packet */
|
|
for (; len > 0; --len) {
|
|
GETCHAR(code, p);
|
|
printer(arg, " %.2x", code);
|
|
}
|
|
|
|
return p - pstart;
|
|
}
|