609 lines
15 KiB
C
609 lines
15 KiB
C
/*****************************************************************************
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* pap.c - Network Password Authentication Protocol program file.
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*
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* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
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* portions Copyright (c) 1997 by Global Election Systems Inc.
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice and the following disclaimer are included verbatim in any
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* distributions. No written agreement, license, or royalty fee is required
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* for any of the authorized uses.
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*
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* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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* REVISION HISTORY
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*
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* 03-01-01 Marc Boucher <marc@mbsi.ca>
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* Ported to lwIP.
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* 97-12-12 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
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* Original.
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*****************************************************************************/
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/*
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* upap.c - User/Password Authentication Protocol.
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*
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* Copyright (c) 1989 Carnegie Mellon University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by Carnegie Mellon University. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#include "ppp.h"
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#include "auth.h"
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#include "pap.h"
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#include "pppdebug.h"
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#if PAP_SUPPORT > 0
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/***********************************/
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/*** LOCAL FUNCTION DECLARATIONS ***/
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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 (int);
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static void upap_lowerup (int);
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static void upap_lowerdown (int);
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static void upap_input (int, u_char *, int);
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static void upap_protrej (int);
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static void upap_timeout (void *);
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static void upap_reqtimeout (void *);
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static void upap_rauthreq (upap_state *, u_char *, int, int);
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static void upap_rauthack (upap_state *, u_char *, int, int);
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static void upap_rauthnak (upap_state *, u_char *, int, int);
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static void upap_sauthreq (upap_state *);
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static void upap_sresp (upap_state *, u_char, u_char, char *, int);
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/******************************/
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/*** PUBLIC DATA STRUCTURES ***/
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/******************************/
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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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#if 0
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upap_printpkt,
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NULL,
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#endif
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1,
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"PAP",
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#if 0
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NULL,
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NULL,
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NULL
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#endif
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};
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upap_state upap[NUM_PPP]; /* UPAP state; one for each unit */
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/***********************************/
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/*** PUBLIC FUNCTION DEFINITIONS ***/
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/***********************************/
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/*
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* Set the default login name and password for the pap sessions
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*/
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void upap_setloginpasswd(int unit, const char *luser, const char *lpassword)
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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 = luser;
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u->us_userlen = strlen(luser);
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u->us_passwd = lpassword;
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u->us_passwdlen = strlen(lpassword);
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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 upap_authwithpeer(int unit, char *user, char *password)
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{
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upap_state *u = &upap[unit];
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UPAPDEBUG((LOG_INFO, "upap_authwithpeer: %d user=%s password=%s s=%d\n",
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unit, user, password, u->us_clientstate));
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upap_setloginpasswd(unit, user, 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 upap_authpeer(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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/*** LOCAL FUNCTION DEFINITIONS ***/
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/**********************************/
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/*
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* upap_init - Initialize a UPAP unit.
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*/
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static void upap_init(int unit)
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{
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upap_state *u = &upap[unit];
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UPAPDEBUG((LOG_INFO, "upap_init: %d\n", 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_timeout - Retransmission timer for sending auth-reqs expired.
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*/
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static void upap_timeout(void *arg)
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{
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upap_state *u = (upap_state *) arg;
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UPAPDEBUG((LOG_INFO, "upap_timeout: %d timeout %d expired s=%d\n",
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u->us_unit, u->us_timeouttime, u->us_clientstate));
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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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UPAPDEBUG((LOG_ERR, "No response to PAP authenticate-requests\n"));
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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 upap_reqtimeout(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 upap_lowerup(int unit)
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{
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upap_state *u = &upap[unit];
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UPAPDEBUG((LOG_INFO, "upap_lowerup: %d s=%d\n", unit, u->us_clientstate));
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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 upap_lowerdown(int unit)
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{
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upap_state *u = &upap[unit];
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UPAPDEBUG((LOG_INFO, "upap_lowerdown: %d s=%d\n", unit, u->us_clientstate));
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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 upap_protrej(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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UPAPDEBUG((LOG_ERR, "PAP authentication failed due to protocol-reject\n"));
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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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UPAPDEBUG((LOG_ERR, "PAP authentication of peer failed (protocol-reject)\n"));
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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 upap_input(int unit, u_char *inpacket, 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((LOG_INFO, "pap_input: rcvd short header.\n"));
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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((LOG_INFO, "pap_input: rcvd illegal length.\n"));
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return;
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}
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if (len > l) {
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UPAPDEBUG((LOG_INFO, "pap_input: rcvd short packet.\n"));
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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 upap_rauthreq(
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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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{
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u_char ruserlen, rpasswdlen;
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char *ruser, *rpasswd;
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int retcode;
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char *msg;
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int msglen;
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UPAPDEBUG((LOG_INFO, "pap_rauth: Rcvd id %d.\n", id));
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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 < sizeof (u_char)) {
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UPAPDEBUG((LOG_INFO, "pap_rauth: rcvd short packet.\n"));
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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((LOG_INFO, "pap_rauth: rcvd short packet.\n"));
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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((LOG_INFO, "pap_rauth: rcvd short packet.\n"));
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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, &msglen);
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BZERO(rpasswd, rpasswdlen);
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upap_sresp(u, retcode, id, msg, msglen);
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if (retcode == UPAP_AUTHACK) {
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u->us_serverstate = UPAPSS_OPEN;
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auth_peer_success(u->us_unit, PPP_PAP, ruser, ruserlen);
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} else {
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u->us_serverstate = UPAPSS_BADAUTH;
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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 upap_rauthack(
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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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{
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u_char msglen;
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char *msg;
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UPAPDEBUG((LOG_INFO, "pap_rauthack: Rcvd id %d s=%d\n", id, u->us_clientstate));
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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 < sizeof (u_char)) {
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UPAPDEBUG((LOG_INFO, "pap_rauthack: rcvd short packet.\n"));
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return;
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}
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GETCHAR(msglen, inp);
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len -= sizeof (u_char);
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if (len < msglen) {
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UPAPDEBUG((LOG_INFO, "pap_rauthack: rcvd short packet.\n"));
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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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u->us_clientstate = UPAPCS_OPEN;
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auth_withpeer_success(u->us_unit, PPP_PAP);
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}
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/*
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* upap_rauthnak - Receive Authenticate-Nakk.
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*/
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static void upap_rauthnak(
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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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{
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u_char msglen;
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char *msg;
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UPAPDEBUG((LOG_INFO, "pap_rauthnak: Rcvd id %d s=%d\n", id, u->us_clientstate));
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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 < sizeof (u_char)) {
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UPAPDEBUG((LOG_INFO, "pap_rauthnak: rcvd short packet.\n"));
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return;
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}
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GETCHAR(msglen, inp);
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len -= sizeof (u_char);
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if (len < msglen) {
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UPAPDEBUG((LOG_INFO, "pap_rauthnak: rcvd short packet.\n"));
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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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u->us_clientstate = UPAPCS_BADAUTH;
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UPAPDEBUG((LOG_ERR, "PAP authentication failed\n"));
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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.
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*/
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static void upap_sauthreq(upap_state *u)
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{
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u_char *outp;
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int outlen;
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outlen = UPAP_HEADERLEN + 2 * sizeof (u_char)
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+ u->us_userlen + u->us_passwdlen;
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outp = outpacket_buf[u->us_unit];
|
|
|
|
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);
|
|
|
|
pppWrite(u->us_unit, outpacket_buf[u->us_unit], outlen + PPP_HDRLEN);
|
|
|
|
UPAPDEBUG((LOG_INFO, "pap_sauth: Sent id %d\n", u->us_id));
|
|
|
|
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(
|
|
upap_state *u,
|
|
u_char code,
|
|
u_char id,
|
|
char *msg,
|
|
int msglen
|
|
)
|
|
{
|
|
u_char *outp;
|
|
int outlen;
|
|
|
|
outlen = UPAP_HEADERLEN + sizeof (u_char) + msglen;
|
|
outp = outpacket_buf[u->us_unit];
|
|
MAKEHEADER(outp, PPP_PAP);
|
|
|
|
PUTCHAR(code, outp);
|
|
PUTCHAR(id, outp);
|
|
PUTSHORT(outlen, outp);
|
|
PUTCHAR(msglen, outp);
|
|
BCOPY(msg, outp, msglen);
|
|
pppWrite(u->us_unit, outpacket_buf[u->us_unit], outlen + PPP_HDRLEN);
|
|
|
|
UPAPDEBUG((LOG_INFO, "pap_sresp: Sent code %d, id %d s=%d\n",
|
|
code, id, u->us_clientstate));
|
|
}
|
|
|
|
#if 0
|
|
/*
|
|
* upap_printpkt - print the contents of a PAP packet.
|
|
*/
|
|
static int upap_printpkt(
|
|
u_char *p,
|
|
int plen,
|
|
void (*printer) (void *, char *, ...),
|
|
void *arg
|
|
)
|
|
{
|
|
(void)p;
|
|
(void)plen;
|
|
(void)printer;
|
|
(void)arg;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#endif /* PAP_SUPPORT */
|
|
|