Diff: lwip/netif/ppp/pap.c

Revision:

0:d26c1b55cfca

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lwip/netif/ppp/pap.c	Sun Jun 19 16:23:40 2016 +0000
@@ -0,0 +1,628 @@
+/*****************************************************************************
+* 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_impl.h"
+#include "pppdebug.h"
+
+#include "auth.h"
+#include "pap.h"
+
+#include <string.h>
+
+#if 0 /* UNUSED */
+static bool hide_password = 1;
+
+/*
+ * Command-line options.
+ */
+static option_t pap_option_list[] = {
+    { "hide-password", o_bool, &hide_password,
+      "Don't output passwords to log", 1 },
+    { "show-password", o_bool, &hide_password,
+      "Show password string in debug log messages", 0 },
+    { "pap-restart", o_int, &upap[0].us_timeouttime,
+      "Set retransmit timeout for PAP" },
+    { "pap-max-authreq", o_int, &upap[0].us_maxtransmits,
+      "Set max number of transmissions for auth-reqs" },
+    { "pap-timeout", o_int, &upap[0].us_reqtimeout,
+      "Set time limit for peer PAP authentication" },
+    { NULL }
+};
+#endif
+
+/*
+ * 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);
+#if PPP_ADDITIONAL_CALLBACKS
+static int  upap_printpkt (u_char *, int, void (*)(void *, char *, ...), void *);
+#endif /* PPP_ADDITIONAL_CALLBACKS */
+
+struct protent pap_protent = {
+  PPP_PAP,
+  upap_init,
+  upap_input,
+  upap_protrej,
+  upap_lowerup,
+  upap_lowerdown,
+  NULL,
+  NULL,
+#if PPP_ADDITIONAL_CALLBACKS
+  upap_printpkt,
+  NULL,
+#endif /* PPP_ADDITIONAL_CALLBACKS */
+  1,
+  "PAP",
+#if PPP_ADDITIONAL_CALLBACKS
+  NULL,
+  NULL,
+  NULL
+#endif /* PPP_ADDITIONAL_CALLBACKS */
+};
+
+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 *, u_char, 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];
+
+  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_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));
+
+  /* Save the username and password we're given */
+  u->us_user = user;
+  u->us_userlen = (int)strlen(user);
+  u->us_passwd = password;
+  u->us_passwdlen = (int)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;
+
+  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) {
+    UPAPDEBUG(LOG_INFO, ("upap_timeout: not in AUTHREQ state!\n"));
+    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 and set upap timeout*/
+}
+
+
+/*
+ * 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: init %d clientstate 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 */
+    /* now client state is UPAPCS__AUTHREQ */
+  }
+
+  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 < (int)UPAP_HEADERLEN) {
+    UPAPDEBUG(LOG_INFO, ("pap_input: rcvd short header.\n"));
+    return;
+  }
+  GETCHAR(code, inp);
+  GETCHAR(id, inp);
+  GETSHORT(len, inp);
+  if (len < (int)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 */
+      UPAPDEBUG(LOG_INFO, ("pap_input: UNHANDLED default: code: %d, id: %d, len: %d.\n", code, id, len));
+      break;
+  }
+}
+
+
+/*
+ * upap_rauth - Receive Authenticate.
+ */
+static void
+upap_rauthreq(upap_state *u, u_char *inp, u_char id, int len)
+{
+  u_char ruserlen, rpasswdlen;
+  char *ruser, *rpasswd;
+  u_char 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 < (int)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);
+  /* lwip: currently retcode is always UPAP_AUTHACK */
+  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 */
+    UPAPDEBUG(LOG_INFO, ("pap_rauthack: us_clientstate != UPAPCS_AUTHREQ\n"));
+    return;
+  }
+
+  /*
+   * Parse message.
+   */
+  if (len < (int)sizeof (u_char)) {
+    UPAPDEBUG(LOG_INFO, ("pap_rauthack: ignoring missing msg-length.\n"));
+  } else {
+    GETCHAR(msglen, inp);
+    if (msglen > 0) {
+      len -= sizeof (u_char);
+      if (len < msglen) {
+        UPAPDEBUG(LOG_INFO, ("pap_rauthack: rcvd short packet.\n"));
+        return;
+      }
+      msg = (char *) inp;
+      PRINTMSG(msg, msglen);
+    }
+  }
+  UNTIMEOUT(upap_timeout, u);    /* Cancel timeout */
+  u->us_clientstate = UPAPCS_OPEN;
+
+  auth_withpeer_success(u->us_unit, PPP_PAP);
+}
+
+
+/*
+ * upap_rauthnak - Receive Authenticate-Nak.
+ */
+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: ignoring missing msg-length.\n"));
+  } else {
+    GETCHAR(msglen, inp);
+    if(msglen > 0) {
+      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 PPP_ADDITIONAL_CALLBACKS
+static char *upap_codenames[] = {
+    "AuthReq", "AuthAck", "AuthNak"
+};
+
+/*
+ * 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 /* PPP_ADDITIONAL_CALLBACKS */
+
+#endif /* PAP_SUPPORT */
+
+#endif /* PPP_SUPPORT */