--- /dev/null
+/*****************************************************************************
+* pap.c - Network Password Authentication Protocol program file.
+*
+* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
+* portions Copyright (c) 1997 by Global Election Systems Inc.
+*
+* The authors hereby grant permission to use, copy, modify, distribute,
+* and license this software and its documentation for any purpose, provided
+* that existing copyright notices are retained in all copies and that this
+* notice and the following disclaimer are included verbatim in any
+* distributions. No written agreement, license, or royalty fee is required
+* for any of the authorized uses.
+*
+* THIS SOFTWARE IS PROVIDED BY THE 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 THE 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.
+*
+******************************************************************************
+* REVISION HISTORY
+*
+* 03-01-01 Marc Boucher <marc@mbsi.ca>
+* Ported to lwIP.
+* 97-12-12 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
+* Original.
+*****************************************************************************/
+/*
+ * upap.c - User/Password Authentication Protocol.
+ *
+ * Copyright (c) 1989 Carnegie Mellon University.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by Carnegie Mellon University. The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include "lwip/opt.h"
+
+#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
+
+#if PAP_SUPPORT /* don't build if not configured for use in lwipopts.h */
+
+#include "ppp.h"
+#include "pppdebug.h"
+
+#include "auth.h"
+#include "pap.h"
+
+/***********************************/
+/*** LOCAL FUNCTION DECLARATIONS ***/
+/***********************************/
+/*
+ * Protocol entry points.
+ */
+static void upap_init (int);
+static void upap_lowerup (int);
+static void upap_lowerdown (int);
+static void upap_input (int, u_char *, int);
+static void upap_protrej (int);
+
+static void upap_timeout (void *);
+static void upap_reqtimeout(void *);
+static void upap_rauthreq (upap_state *, u_char *, int, int);
+static void upap_rauthack (upap_state *, u_char *, int, int);
+static void upap_rauthnak (upap_state *, u_char *, int, int);
+static void upap_sauthreq (upap_state *);
+static void upap_sresp (upap_state *, u_char, u_char, char *, int);
+
+
+/******************************/
+/*** PUBLIC DATA STRUCTURES ***/
+/******************************/
+struct protent pap_protent = {
+ PPP_PAP,
+ upap_init,
+ upap_input,
+ upap_protrej,
+ upap_lowerup,
+ upap_lowerdown,
+ NULL,
+ NULL,
+#if 0
+ upap_printpkt,
+ NULL,
+#endif
+ 1,
+ "PAP",
+#if 0
+ NULL,
+ NULL,
+ NULL
+#endif
+};
+
+upap_state upap[NUM_PPP]; /* UPAP state; one for each unit */
+
+
+
+/***********************************/
+/*** PUBLIC FUNCTION DEFINITIONS ***/
+/***********************************/
+/*
+ * Set the default login name and password for the pap sessions
+ */
+void
+upap_setloginpasswd(int unit, const char *luser, const char *lpassword)
+{
+ upap_state *u = &upap[unit];
+
+ /* Save the username and password we're given */
+ u->us_user = luser;
+ u->us_userlen = strlen(luser);
+ u->us_passwd = lpassword;
+ u->us_passwdlen = strlen(lpassword);
+}
+
+
+/*
+ * upap_authwithpeer - Authenticate us with our peer (start client).
+ *
+ * Set new state and send authenticate's.
+ */
+void
+upap_authwithpeer(int unit, char *user, char *password)
+{
+ upap_state *u = &upap[unit];
+
+ UPAPDEBUG((LOG_INFO, "upap_authwithpeer: %d user=%s password=%s s=%d\n",
+ unit, user, password, u->us_clientstate));
+
+ upap_setloginpasswd(unit, user, password);
+
+ u->us_transmits = 0;
+
+ /* Lower layer up yet? */
+ if (u->us_clientstate == UPAPCS_INITIAL ||
+ u->us_clientstate == UPAPCS_PENDING) {
+ u->us_clientstate = UPAPCS_PENDING;
+ return;
+ }
+
+ upap_sauthreq(u); /* Start protocol */
+}
+
+
+/*
+ * upap_authpeer - Authenticate our peer (start server).
+ *
+ * Set new state.
+ */
+void
+upap_authpeer(int unit)
+{
+ upap_state *u = &upap[unit];
+
+ /* Lower layer up yet? */
+ if (u->us_serverstate == UPAPSS_INITIAL ||
+ u->us_serverstate == UPAPSS_PENDING) {
+ u->us_serverstate = UPAPSS_PENDING;
+ return;
+ }
+
+ u->us_serverstate = UPAPSS_LISTEN;
+ if (u->us_reqtimeout > 0) {
+ TIMEOUT(upap_reqtimeout, u, u->us_reqtimeout);
+ }
+}
+
+
+
+/**********************************/
+/*** LOCAL FUNCTION DEFINITIONS ***/
+/**********************************/
+/*
+ * upap_init - Initialize a UPAP unit.
+ */
+static void
+upap_init(int unit)
+{
+ upap_state *u = &upap[unit];
+
+ UPAPDEBUG((LOG_INFO, "upap_init: %d\n", unit));
+ u->us_unit = unit;
+ u->us_user = NULL;
+ u->us_userlen = 0;
+ u->us_passwd = NULL;
+ u->us_passwdlen = 0;
+ u->us_clientstate = UPAPCS_INITIAL;
+ u->us_serverstate = UPAPSS_INITIAL;
+ u->us_id = 0;
+ u->us_timeouttime = UPAP_DEFTIMEOUT;
+ u->us_maxtransmits = 10;
+ u->us_reqtimeout = UPAP_DEFREQTIME;
+}
+
+/*
+ * upap_timeout - Retransmission timer for sending auth-reqs expired.
+ */
+static void
+upap_timeout(void *arg)
+{
+ upap_state *u = (upap_state *) arg;
+
+ UPAPDEBUG((LOG_INFO, "upap_timeout: %d timeout %d expired s=%d\n",
+ u->us_unit, u->us_timeouttime, u->us_clientstate));
+
+ if (u->us_clientstate != UPAPCS_AUTHREQ) {
+ return;
+ }
+
+ if (u->us_transmits >= u->us_maxtransmits) {
+ /* give up in disgust */
+ UPAPDEBUG((LOG_ERR, "No response to PAP authenticate-requests\n"));
+ u->us_clientstate = UPAPCS_BADAUTH;
+ auth_withpeer_fail(u->us_unit, PPP_PAP);
+ return;
+ }
+
+ upap_sauthreq(u); /* Send Authenticate-Request */
+}
+
+
+/*
+ * upap_reqtimeout - Give up waiting for the peer to send an auth-req.
+ */
+static void
+upap_reqtimeout(void *arg)
+{
+ upap_state *u = (upap_state *) arg;
+
+ if (u->us_serverstate != UPAPSS_LISTEN) {
+ return; /* huh?? */
+ }
+
+ auth_peer_fail(u->us_unit, PPP_PAP);
+ u->us_serverstate = UPAPSS_BADAUTH;
+}
+
+
+/*
+ * upap_lowerup - The lower layer is up.
+ *
+ * Start authenticating if pending.
+ */
+static void
+upap_lowerup(int unit)
+{
+ upap_state *u = &upap[unit];
+
+ UPAPDEBUG((LOG_INFO, "upap_lowerup: %d s=%d\n", unit, u->us_clientstate));
+
+ if (u->us_clientstate == UPAPCS_INITIAL) {
+ u->us_clientstate = UPAPCS_CLOSED;
+ } else if (u->us_clientstate == UPAPCS_PENDING) {
+ upap_sauthreq(u); /* send an auth-request */
+ }
+
+ if (u->us_serverstate == UPAPSS_INITIAL) {
+ u->us_serverstate = UPAPSS_CLOSED;
+ } else if (u->us_serverstate == UPAPSS_PENDING) {
+ u->us_serverstate = UPAPSS_LISTEN;
+ if (u->us_reqtimeout > 0) {
+ TIMEOUT(upap_reqtimeout, u, u->us_reqtimeout);
+ }
+ }
+}
+
+
+/*
+ * upap_lowerdown - The lower layer is down.
+ *
+ * Cancel all timeouts.
+ */
+static void
+upap_lowerdown(int unit)
+{
+ upap_state *u = &upap[unit];
+
+ UPAPDEBUG((LOG_INFO, "upap_lowerdown: %d s=%d\n", unit, u->us_clientstate));
+
+ if (u->us_clientstate == UPAPCS_AUTHREQ) { /* Timeout pending? */
+ UNTIMEOUT(upap_timeout, u); /* Cancel timeout */
+ }
+ if (u->us_serverstate == UPAPSS_LISTEN && u->us_reqtimeout > 0) {
+ UNTIMEOUT(upap_reqtimeout, u);
+ }
+
+ u->us_clientstate = UPAPCS_INITIAL;
+ u->us_serverstate = UPAPSS_INITIAL;
+}
+
+
+/*
+ * upap_protrej - Peer doesn't speak this protocol.
+ *
+ * This shouldn't happen. In any case, pretend lower layer went down.
+ */
+static void
+upap_protrej(int unit)
+{
+ upap_state *u = &upap[unit];
+
+ if (u->us_clientstate == UPAPCS_AUTHREQ) {
+ UPAPDEBUG((LOG_ERR, "PAP authentication failed due to protocol-reject\n"));
+ auth_withpeer_fail(unit, PPP_PAP);
+ }
+ if (u->us_serverstate == UPAPSS_LISTEN) {
+ UPAPDEBUG((LOG_ERR, "PAP authentication of peer failed (protocol-reject)\n"));
+ auth_peer_fail(unit, PPP_PAP);
+ }
+ upap_lowerdown(unit);
+}
+
+
+/*
+ * upap_input - Input UPAP packet.
+ */
+static void
+upap_input(int unit, u_char *inpacket, int l)
+{
+ upap_state *u = &upap[unit];
+ u_char *inp;
+ u_char code, id;
+ int len;
+
+ /*
+ * Parse header (code, id and length).
+ * If packet too short, drop it.
+ */
+ inp = inpacket;
+ if (l < UPAP_HEADERLEN) {
+ UPAPDEBUG((LOG_INFO, "pap_input: rcvd short header.\n"));
+ return;
+ }
+ GETCHAR(code, inp);
+ GETCHAR(id, inp);
+ GETSHORT(len, inp);
+ if (len < UPAP_HEADERLEN) {
+ UPAPDEBUG((LOG_INFO, "pap_input: rcvd illegal length.\n"));
+ return;
+ }
+ if (len > l) {
+ UPAPDEBUG((LOG_INFO, "pap_input: rcvd short packet.\n"));
+ return;
+ }
+ len -= UPAP_HEADERLEN;
+
+ /*
+ * Action depends on code.
+ */
+ switch (code) {
+ case UPAP_AUTHREQ:
+ upap_rauthreq(u, inp, id, len);
+ break;
+
+ case UPAP_AUTHACK:
+ upap_rauthack(u, inp, id, len);
+ break;
+
+ case UPAP_AUTHNAK:
+ upap_rauthnak(u, inp, id, len);
+ break;
+
+ default: /* XXX Need code reject */
+ break;
+ }
+}
+
+
+/*
+ * upap_rauth - Receive Authenticate.
+ */
+static void
+upap_rauthreq(upap_state *u, u_char *inp, int id, int len)
+{
+ u_char ruserlen, rpasswdlen;
+ char *ruser, *rpasswd;
+ int retcode;
+ char *msg;
+ int msglen;
+
+ UPAPDEBUG((LOG_INFO, "pap_rauth: Rcvd id %d.\n", id));
+
+ if (u->us_serverstate < UPAPSS_LISTEN) {
+ return;
+ }
+
+ /*
+ * If we receive a duplicate authenticate-request, we are
+ * supposed to return the same status as for the first request.
+ */
+ if (u->us_serverstate == UPAPSS_OPEN) {
+ upap_sresp(u, UPAP_AUTHACK, id, "", 0); /* return auth-ack */
+ return;
+ }
+ if (u->us_serverstate == UPAPSS_BADAUTH) {
+ upap_sresp(u, UPAP_AUTHNAK, id, "", 0); /* return auth-nak */
+ return;
+ }
+
+ /*
+ * Parse user/passwd.
+ */
+ if (len < sizeof (u_char)) {
+ UPAPDEBUG((LOG_INFO, "pap_rauth: rcvd short packet.\n"));
+ return;
+ }
+ GETCHAR(ruserlen, inp);
+ len -= sizeof (u_char) + ruserlen + sizeof (u_char);
+ if (len < 0) {
+ UPAPDEBUG((LOG_INFO, "pap_rauth: rcvd short packet.\n"));
+ return;
+ }
+ ruser = (char *) inp;
+ INCPTR(ruserlen, inp);
+ GETCHAR(rpasswdlen, inp);
+ if (len < rpasswdlen) {
+ UPAPDEBUG((LOG_INFO, "pap_rauth: rcvd short packet.\n"));
+ return;
+ }
+ rpasswd = (char *) inp;
+
+ /*
+ * Check the username and password given.
+ */
+ retcode = check_passwd(u->us_unit, ruser, ruserlen, rpasswd, rpasswdlen, &msg, &msglen);
+ BZERO(rpasswd, rpasswdlen);
+
+ upap_sresp(u, retcode, id, msg, msglen);
+
+ if (retcode == UPAP_AUTHACK) {
+ u->us_serverstate = UPAPSS_OPEN;
+ auth_peer_success(u->us_unit, PPP_PAP, ruser, ruserlen);
+ } else {
+ u->us_serverstate = UPAPSS_BADAUTH;
+ auth_peer_fail(u->us_unit, PPP_PAP);
+ }
+
+ if (u->us_reqtimeout > 0) {
+ UNTIMEOUT(upap_reqtimeout, u);
+ }
+}
+
+
+/*
+ * upap_rauthack - Receive Authenticate-Ack.
+ */
+static void
+upap_rauthack(upap_state *u, u_char *inp, int id, int len)
+{
+ u_char msglen;
+ char *msg;
+
+ LWIP_UNUSED_ARG(id);
+
+ UPAPDEBUG((LOG_INFO, "pap_rauthack: Rcvd id %d s=%d\n", id, u->us_clientstate));
+
+ if (u->us_clientstate != UPAPCS_AUTHREQ) { /* XXX */
+ return;
+ }
+
+ /*
+ * Parse message.
+ */
+ if (len < sizeof (u_char)) {
+ UPAPDEBUG((LOG_INFO, "pap_rauthack: rcvd short packet.\n"));
+ return;
+ }
+ GETCHAR(msglen, inp);
+ len -= sizeof (u_char);
+ if (len < msglen) {
+ UPAPDEBUG((LOG_INFO, "pap_rauthack: rcvd short packet.\n"));
+ return;
+ }
+ msg = (char *) inp;
+ PRINTMSG(msg, msglen);
+
+ u->us_clientstate = UPAPCS_OPEN;
+
+ auth_withpeer_success(u->us_unit, PPP_PAP);
+}
+
+
+/*
+ * upap_rauthnak - Receive Authenticate-Nakk.
+ */
+static void
+upap_rauthnak(upap_state *u, u_char *inp, int id, int len)
+{
+ u_char msglen;
+ char *msg;
+
+ LWIP_UNUSED_ARG(id);
+
+ UPAPDEBUG((LOG_INFO, "pap_rauthnak: Rcvd id %d s=%d\n", id, u->us_clientstate));
+
+ if (u->us_clientstate != UPAPCS_AUTHREQ) { /* XXX */
+ return;
+ }
+
+ /*
+ * Parse message.
+ */
+ if (len < sizeof (u_char)) {
+ UPAPDEBUG((LOG_INFO, "pap_rauthnak: rcvd short packet.\n"));
+ return;
+ }
+ GETCHAR(msglen, inp);
+ len -= sizeof (u_char);
+ if (len < msglen) {
+ UPAPDEBUG((LOG_INFO, "pap_rauthnak: rcvd short packet.\n"));
+ return;
+ }
+ msg = (char *) inp;
+ PRINTMSG(msg, msglen);
+
+ u->us_clientstate = UPAPCS_BADAUTH;
+
+ UPAPDEBUG((LOG_ERR, "PAP authentication failed\n"));
+ auth_withpeer_fail(u->us_unit, PPP_PAP);
+}
+
+
+/*
+ * upap_sauthreq - Send an Authenticate-Request.
+ */
+static void
+upap_sauthreq(upap_state *u)
+{
+ u_char *outp;
+ int outlen;
+
+ outlen = UPAP_HEADERLEN + 2 * sizeof (u_char)
+ + u->us_userlen + u->us_passwdlen;
+ 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
+)
+{
+ LWIP_UNUSED_ARG(p);
+ LWIP_UNUSED_ARG(plen);
+ LWIP_UNUSED_ARG(printer);
+ LWIP_UNUSED_ARG(arg);
+ return 0;
+}
+#endif /* 0 */
+
+#endif /* PAP_SUPPORT */
+
+#endif /* PPP_SUPPORT */
