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-rw-r--r--cpukit/pppd/upap.c631
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diff --git a/cpukit/pppd/upap.c b/cpukit/pppd/upap.c
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+++ b/cpukit/pppd/upap.c
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+/*
+ * 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.
+ */
+
+#define RCSID "$Id$"
+
+/*
+ * TODO:
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "pppd.h"
+#include "upap.h"
+
+static const char rcsid[] = RCSID;
+
+static bool hide_password = true;
+
+/*
+ * Command-line options.
+ */
+static option_t pap_option_list[] = {
+ { "hide-password", o_bool, &hide_password,
+ "Don't output passwords to log", 1, NULL, 0, 0 },
+ { "show-password", o_bool, &hide_password,
+ "Show password string in debug log messages", 0, NULL, 0, 0 },
+ { "pap-restart", o_int, &upap[0].us_timeouttime,
+ "Set retransmit timeout for PAP", 0, NULL, 0, 0 },
+ { "pap-max-authreq", o_int, &upap[0].us_maxtransmits,
+ "Set max number of transmissions for auth-reqs", 0, NULL, 0, 0 },
+ { "pap-timeout", o_int, &upap[0].us_reqtimeout,
+ "Set time limit for peer PAP authentication", 0, NULL, 0, 0 },
+ { NULL, 0, NULL, NULL, 0, NULL, 0, 0 }
+};
+
+/*
+ * 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 int upap_printpkt(u_char *, int,
+ void (*)(void *, char *, ...), void *);
+
+struct protent pap_protent = {
+ PPP_PAP,
+ upap_init,
+ upap_input,
+ upap_protrej,
+ upap_lowerup,
+ upap_lowerdown,
+ NULL,
+ NULL,
+ upap_printpkt,
+ NULL,
+ 1,
+ "PAP",
+ NULL,
+ pap_option_list,
+ NULL,
+ NULL,
+ NULL
+};
+
+upap_state upap[NUM_PPP]; /* UPAP state; one for each unit */
+
+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);
+
+
+/*
+ * upap_init - Initialize a UPAP unit.
+ */
+static void
+upap_init(int unit)
+{
+ upap_state *u = &upap[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_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];
+
+ /* Save the username and password we're given */
+ u->us_user = user;
+ u->us_userlen = strlen(user);
+ u->us_passwd = password;
+ u->us_passwdlen = strlen(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);
+}
+
+
+/*
+ * upap_timeout - Retransmission timer for sending auth-reqs expired.
+ */
+static void
+upap_timeout(void *arg)
+{
+ upap_state *u = (upap_state *) arg;
+
+ if (u->us_clientstate != UPAPCS_AUTHREQ)
+ return;
+
+ if (u->us_transmits >= u->us_maxtransmits) {
+ /* give up in disgust */
+ error("No response to PAP authenticate-requests");
+ 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];
+
+ 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];
+
+ 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) {
+ error("PAP authentication failed due to protocol-reject");
+ auth_withpeer_fail(unit, PPP_PAP);
+ }
+ if (u->us_serverstate == UPAPSS_LISTEN) {
+ error("PAP authentication of peer failed (protocol-reject)");
+ 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(("pap_input: rcvd short header."));
+ return;
+ }
+ GETCHAR(code, inp);
+ GETCHAR(id, inp);
+ GETSHORT(len, inp);
+ if (len < UPAP_HEADERLEN) {
+ UPAPDEBUG(("pap_input: rcvd illegal length."));
+ return;
+ }
+ if (len > l) {
+ UPAPDEBUG(("pap_input: rcvd short packet."));
+ 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;
+
+ 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 < 1) {
+ UPAPDEBUG(("pap_rauth: rcvd short packet."));
+ return;
+ }
+ GETCHAR(ruserlen, inp);
+ len -= sizeof (u_char) + ruserlen + sizeof (u_char);
+ if (len < 0) {
+ UPAPDEBUG(("pap_rauth: rcvd short packet."));
+ return;
+ }
+ ruser = (char *) inp;
+ INCPTR(ruserlen, inp);
+ GETCHAR(rpasswdlen, inp);
+ if (len < rpasswdlen) {
+ UPAPDEBUG(("pap_rauth: rcvd short packet."));
+ return;
+ }
+ rpasswd = (char *) inp;
+
+ /*
+ * Check the username and password given.
+ */
+ retcode = check_passwd(u->us_unit, ruser, ruserlen, rpasswd,
+ rpasswdlen, &msg);
+ BZERO(rpasswd, rpasswdlen);
+ msglen = strlen(msg);
+ if (msglen > 255)
+ msglen = 255;
+
+ 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;
+
+ if (u->us_clientstate != UPAPCS_AUTHREQ) /* XXX */
+ return;
+
+ /*
+ * Parse message.
+ */
+ if (len < 1) {
+ UPAPDEBUG(("pap_rauthack: ignoring missing msg-length."));
+ } else {
+ GETCHAR(msglen, inp);
+ if (msglen > 0) {
+ len -= sizeof (u_char);
+ if (len < msglen) {
+ UPAPDEBUG(("pap_rauthack: rcvd short packet."));
+ 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;
+
+ if (u->us_clientstate != UPAPCS_AUTHREQ) /* XXX */
+ return;
+
+ /*
+ * Parse message.
+ */
+ if (len < 1) {
+ UPAPDEBUG(("pap_rauthnak: ignoring missing msg-length."));
+ } else {
+ GETCHAR(msglen, inp);
+ if (msglen > 0) {
+ len -= sizeof (u_char);
+ if (len < msglen) {
+ UPAPDEBUG(("pap_rauthnak: rcvd short packet."));
+ return;
+ }
+ msg = (char *) inp;
+ PRINTMSG(msg, msglen);
+ }
+ }
+
+ u->us_clientstate = UPAPCS_BADAUTH;
+
+ error("PAP authentication failed");
+ 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;
+
+ 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(
+ 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;
+ 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(
+ u_char *p,
+ int plen,
+ void (*printer)(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;
+}
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