[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/ppp-2.4.1/pppd/chap.c b/ap/app/ppp-2.4.1/pppd/chap.c
new file mode 100644
index 0000000..6c6c5fc
--- /dev/null
+++ b/ap/app/ppp-2.4.1/pppd/chap.c
@@ -0,0 +1,958 @@
+/*
+ * chap.c - Challenge Handshake Authentication Protocol.
+ *
+ * Copyright (c) 1993 The Australian National 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 the Australian National 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.
+ *
+ * Copyright (c) 1991 Gregory M. Christy.
+ * 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 Gregory M. Christy. The name of the author 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: chap.c,v 1.1 2008-08-04 06:11:51 winfred Exp $"
+
+/*
+ * TODO:
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/time.h>
+
+#include <pppd.h>
+#include "chap.h"
+#include "md5.h"
+#include "fsm.h"
+#include "lcp.h"
+#ifdef CHAPMS
+#include "chap_ms.h"
+#endif
+
+static const char rcsid[] = RCSID;
+
+/*
+ * Command-line options.
+ */
+static option_t chap_option_list[] = {
+ { "chap-restart", o_int, &chap[0].timeouttime,
+ "Set timeout for CHAP", OPT_PRIO },
+ { "chap-max-challenge", o_int, &chap[0].max_transmits,
+ "Set max #xmits for challenge", OPT_PRIO },
+ { "chap-interval", o_int, &chap[0].chal_interval,
+ "Set interval for rechallenge", OPT_PRIO },
+#ifdef MSLANMAN
+ { "ms-lanman", o_bool, &ms_lanman,
+ "Use LanMan passwd when using MS-CHAP", 1 },
+#endif
+ { NULL }
+};
+
+/*
+ * Protocol entry points.
+ */
+static void ChapInit __P((int));
+static void ChapLowerUp __P((int));
+static void ChapLowerDown __P((int));
+static void ChapInput __P((int, u_char *, int));
+static void ChapProtocolReject __P((int));
+static int ChapPrintPkt __P((u_char *, int,
+ void (*) __P((void *, char *, ...)), void *));
+
+struct protent chap_protent = {
+ PPP_CHAP,
+ ChapInit,
+ ChapInput,
+ ChapProtocolReject,
+ ChapLowerUp,
+ ChapLowerDown,
+ NULL,
+ NULL,
+ ChapPrintPkt,
+ NULL,
+ 1,
+ "CHAP",
+ NULL,
+ chap_option_list,
+ NULL,
+ NULL,
+ NULL
+};
+
+chap_state chap[NUM_PPP]; /* CHAP state; one for each unit */
+
+static void ChapChallengeTimeout __P((void *));
+static void ChapResponseTimeout __P((void *));
+static void ChapReceiveChallenge __P((chap_state *, u_char *, int, int));
+static void ChapRechallenge __P((void *));
+static void ChapReceiveResponse __P((chap_state *, u_char *, int, int));
+static void ChapReceiveSuccess __P((chap_state *, u_char *, int, int));
+static void ChapReceiveFailure __P((chap_state *, u_char *, int, int));
+static void ChapSendStatus __P((chap_state *, int));
+static void ChapSendChallenge __P((chap_state *));
+static void ChapSendResponse __P((chap_state *));
+void ChapGenChallenge __P((chap_state *));
+
+extern double drand48 __P((void));
+extern void srand48 __P((long));
+
+/*
+ * ChapInit - Initialize a CHAP unit.
+ */
+static void
+ChapInit(unit)
+ int unit;
+{
+ chap_state *cstate = &chap[unit];
+
+ BZERO(cstate, sizeof(*cstate));
+ cstate->unit = unit;
+ cstate->clientstate = CHAPCS_INITIAL;
+ cstate->serverstate = CHAPSS_INITIAL;
+ cstate->timeouttime = CHAP_DEFTIMEOUT;
+ cstate->max_transmits = CHAP_DEFTRANSMITS;
+ /* random number generator is initialized in magic_init */
+}
+
+
+/*
+ * ChapAuthWithPeer - Authenticate us with our peer (start client).
+ *
+ */
+void
+ChapAuthWithPeer(unit, our_name, digest)
+ int unit;
+ char *our_name;
+ int digest;
+{
+ chap_state *cstate = &chap[unit];
+
+ cstate->resp_name = our_name;
+ cstate->resp_type = digest;
+
+ if (cstate->clientstate == CHAPCS_INITIAL ||
+ cstate->clientstate == CHAPCS_PENDING) {
+ /* lower layer isn't up - wait until later */
+ cstate->clientstate = CHAPCS_PENDING;
+ return;
+ }
+
+ /*
+ * We get here as a result of LCP coming up.
+ * So even if CHAP was open before, we will
+ * have to re-authenticate ourselves.
+ */
+ cstate->clientstate = CHAPCS_LISTEN;
+}
+
+
+/*
+ * ChapAuthPeer - Authenticate our peer (start server).
+ */
+void
+ChapAuthPeer(unit, our_name, digest)
+ int unit;
+ char *our_name;
+ int digest;
+{
+ chap_state *cstate = &chap[unit];
+
+ cstate->chal_name = our_name;
+ cstate->chal_type = digest;
+
+ if (cstate->serverstate == CHAPSS_INITIAL ||
+ cstate->serverstate == CHAPSS_PENDING) {
+ /* lower layer isn't up - wait until later */
+ cstate->serverstate = CHAPSS_PENDING;
+ return;
+ }
+
+ ChapGenChallenge(cstate);
+ ChapSendChallenge(cstate); /* crank it up dude! */
+ cstate->serverstate = CHAPSS_INITIAL_CHAL;
+}
+
+
+/*
+ * ChapChallengeTimeout - Timeout expired on sending challenge.
+ */
+static void
+ChapChallengeTimeout(arg)
+ void *arg;
+{
+ chap_state *cstate = (chap_state *) arg;
+
+ /* if we aren't sending challenges, don't worry. then again we */
+ /* probably shouldn't be here either */
+ if (cstate->serverstate != CHAPSS_INITIAL_CHAL &&
+ cstate->serverstate != CHAPSS_RECHALLENGE)
+ return;
+
+ if (cstate->chal_transmits >= cstate->max_transmits) {
+ /* give up on peer */
+ error("Peer failed to respond to CHAP challenge");
+ cstate->serverstate = CHAPSS_BADAUTH;
+ auth_peer_fail(cstate->unit, PPP_CHAP);
+ return;
+ }
+
+ ChapSendChallenge(cstate); /* Re-send challenge */
+}
+
+
+/*
+ * ChapResponseTimeout - Timeout expired on sending response.
+ */
+static void
+ChapResponseTimeout(arg)
+ void *arg;
+{
+ chap_state *cstate = (chap_state *) arg;
+
+ /* if we aren't sending a response, don't worry. */
+ if (cstate->clientstate != CHAPCS_RESPONSE)
+ return;
+
+ ChapSendResponse(cstate); /* re-send response */
+}
+
+
+/*
+ * ChapRechallenge - Time to challenge the peer again.
+ */
+static void
+ChapRechallenge(arg)
+ void *arg;
+{
+ chap_state *cstate = (chap_state *) arg;
+
+ /* if we aren't sending a response, don't worry. */
+ if (cstate->serverstate != CHAPSS_OPEN)
+ return;
+
+ ChapGenChallenge(cstate);
+ ChapSendChallenge(cstate);
+ cstate->serverstate = CHAPSS_RECHALLENGE;
+}
+
+
+/*
+ * ChapLowerUp - The lower layer is up.
+ *
+ * Start up if we have pending requests.
+ */
+static void
+ChapLowerUp(unit)
+ int unit;
+{
+ chap_state *cstate = &chap[unit];
+
+ if (cstate->clientstate == CHAPCS_INITIAL)
+ cstate->clientstate = CHAPCS_CLOSED;
+ else if (cstate->clientstate == CHAPCS_PENDING)
+ cstate->clientstate = CHAPCS_LISTEN;
+
+ if (cstate->serverstate == CHAPSS_INITIAL)
+ cstate->serverstate = CHAPSS_CLOSED;
+ else if (cstate->serverstate == CHAPSS_PENDING) {
+ ChapGenChallenge(cstate);
+ ChapSendChallenge(cstate);
+ cstate->serverstate = CHAPSS_INITIAL_CHAL;
+ }
+}
+
+
+/*
+ * ChapLowerDown - The lower layer is down.
+ *
+ * Cancel all timeouts.
+ */
+static void
+ChapLowerDown(unit)
+ int unit;
+{
+ chap_state *cstate = &chap[unit];
+
+ /* Timeout(s) pending? Cancel if so. */
+ if (cstate->serverstate == CHAPSS_INITIAL_CHAL ||
+ cstate->serverstate == CHAPSS_RECHALLENGE)
+ UNTIMEOUT(ChapChallengeTimeout, cstate);
+ else if (cstate->serverstate == CHAPSS_OPEN
+ && cstate->chal_interval != 0)
+ UNTIMEOUT(ChapRechallenge, cstate);
+ if (cstate->clientstate == CHAPCS_RESPONSE)
+ UNTIMEOUT(ChapResponseTimeout, cstate);
+
+ cstate->clientstate = CHAPCS_INITIAL;
+ cstate->serverstate = CHAPSS_INITIAL;
+}
+
+
+/*
+ * ChapProtocolReject - Peer doesn't grok CHAP.
+ */
+static void
+ChapProtocolReject(unit)
+ int unit;
+{
+ chap_state *cstate = &chap[unit];
+
+ if (cstate->serverstate != CHAPSS_INITIAL &&
+ cstate->serverstate != CHAPSS_CLOSED)
+ auth_peer_fail(unit, PPP_CHAP);
+ if (cstate->clientstate != CHAPCS_INITIAL &&
+ cstate->clientstate != CHAPCS_CLOSED)
+ auth_withpeer_fail(unit, PPP_CHAP);
+ ChapLowerDown(unit); /* shutdown chap */
+}
+
+
+/*
+ * ChapInput - Input CHAP packet.
+ */
+static void
+ChapInput(unit, inpacket, packet_len)
+ int unit;
+ u_char *inpacket;
+ int packet_len;
+{
+ chap_state *cstate = &chap[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 (packet_len < CHAP_HEADERLEN) {
+ CHAPDEBUG(("ChapInput: rcvd short header."));
+ return;
+ }
+ GETCHAR(code, inp);
+ GETCHAR(id, inp);
+ GETSHORT(len, inp);
+ if (len < CHAP_HEADERLEN) {
+ CHAPDEBUG(("ChapInput: rcvd illegal length."));
+ return;
+ }
+ if (len > packet_len) {
+ CHAPDEBUG(("ChapInput: rcvd short packet."));
+ return;
+ }
+ len -= CHAP_HEADERLEN;
+
+ /*
+ * Action depends on code (as in fact it usually does :-).
+ */
+ switch (code) {
+ case CHAP_CHALLENGE:
+ ChapReceiveChallenge(cstate, inp, id, len);
+ break;
+
+ case CHAP_RESPONSE:
+ ChapReceiveResponse(cstate, inp, id, len);
+ break;
+
+ case CHAP_FAILURE:
+ ChapReceiveFailure(cstate, inp, id, len);
+ break;
+
+ case CHAP_SUCCESS:
+ ChapReceiveSuccess(cstate, inp, id, len);
+ break;
+
+ default: /* Need code reject? */
+ warn("Unknown CHAP code (%d) received.", code);
+ break;
+ }
+}
+
+
+/*
+ * ChapReceiveChallenge - Receive Challenge and send Response.
+ */
+static void
+ChapReceiveChallenge(cstate, inp, id, len)
+ chap_state *cstate;
+ u_char *inp;
+ int id;
+ int len;
+{
+ int rchallenge_len;
+ u_char *rchallenge;
+ int secret_len;
+ char secret[MAXSECRETLEN];
+ char rhostname[256];
+ MD5_CTX mdContext;
+ u_char hash[MD5_SIGNATURE_SIZE];
+
+ if (cstate->clientstate == CHAPCS_CLOSED ||
+ cstate->clientstate == CHAPCS_PENDING) {
+ CHAPDEBUG(("ChapReceiveChallenge: in state %d", cstate->clientstate));
+ return;
+ }
+
+ if (len < 2) {
+ CHAPDEBUG(("ChapReceiveChallenge: rcvd short packet."));
+ return;
+ }
+
+ GETCHAR(rchallenge_len, inp);
+ len -= sizeof (u_char) + rchallenge_len; /* now name field length */
+ if (len < 0) {
+ CHAPDEBUG(("ChapReceiveChallenge: rcvd short packet."));
+ return;
+ }
+ rchallenge = inp;
+ INCPTR(rchallenge_len, inp);
+
+ if (len >= sizeof(rhostname))
+ len = sizeof(rhostname) - 1;
+ BCOPY(inp, rhostname, len);
+ rhostname[len] = '\000';
+
+ /* Microsoft doesn't send their name back in the PPP packet */
+ if (explicit_remote || (remote_name[0] != 0 && rhostname[0] == 0)) {
+ strlcpy(rhostname, remote_name, sizeof(rhostname));
+ CHAPDEBUG(("ChapReceiveChallenge: using '%q' as remote name",
+ rhostname));
+ }
+
+ /* get secret for authenticating ourselves with the specified host */
+ if (!get_secret(cstate->unit, cstate->resp_name, rhostname,
+ secret, &secret_len, 0)) {
+ secret_len = 0; /* assume null secret if can't find one */
+ warn("No CHAP secret found for authenticating us to %q", rhostname);
+ }
+
+ /* cancel response send timeout if necessary */
+ if (cstate->clientstate == CHAPCS_RESPONSE)
+ UNTIMEOUT(ChapResponseTimeout, cstate);
+
+ cstate->resp_id = id;
+ cstate->resp_transmits = 0;
+
+ /* generate MD based on negotiated type */
+ switch (cstate->resp_type) {
+
+ case CHAP_DIGEST_MD5:
+ CHAPDEBUG(("ChapReceiveChallenge: rcvd type CHAP-DIGEST-MD5"));
+ MD5Init(&mdContext);
+ MD5Update(&mdContext, &cstate->resp_id, 1);
+ MD5Update(&mdContext, secret, secret_len);
+ MD5Update(&mdContext, rchallenge, rchallenge_len);
+ MD5Final(hash, &mdContext);
+ BCOPY(hash, cstate->response, MD5_SIGNATURE_SIZE);
+ cstate->resp_length = MD5_SIGNATURE_SIZE;
+ break;
+
+#ifdef CHAPMS
+ case CHAP_MICROSOFT:
+ CHAPDEBUG(("ChapReceiveChallenge: rcvd type MS-CHAP-V1."));
+ if(rchallenge_len != 8)
+ {
+ CHAPDEBUG(("Invalid challenge length for MS-CHAP-V1"));
+ return;
+ }
+ ChapMS(cstate, rchallenge, rchallenge_len, secret, secret_len);
+ break;
+
+ case CHAP_MICROSOFT_V2:
+ CHAPDEBUG(("ChapReceiveChallenge: rcvd type MS-CHAP-V2."));
+ if(rchallenge_len != 16)
+ {
+ CHAPDEBUG(("Invalid challenge length for MS-CHAP-V2"));
+ return;
+ }
+ ChapMS_v2(cstate, rchallenge, rchallenge_len, secret, secret_len);
+ break;
+#endif
+
+ default:
+ CHAPDEBUG(("unknown digest type %d", cstate->resp_type));
+ return;
+ }
+
+ BZERO(secret, sizeof(secret));
+ ChapSendResponse(cstate);
+}
+
+
+/*
+ * ChapReceiveResponse - Receive and process response.
+ */
+static void
+ChapReceiveResponse(cstate, inp, id, len)
+ chap_state *cstate;
+ u_char *inp;
+ int id;
+ int len;
+{
+ u_char *remmd, remmd_len;
+ int secret_len, old_state;
+ int code;
+ char rhostname[256];
+ MD5_CTX mdContext;
+ char secret[MAXSECRETLEN];
+ u_char hash[MD5_SIGNATURE_SIZE];
+
+ if (cstate->serverstate == CHAPSS_CLOSED ||
+ cstate->serverstate == CHAPSS_PENDING) {
+ CHAPDEBUG(("ChapReceiveResponse: in state %d", cstate->serverstate));
+ return;
+ }
+
+ if (id != cstate->chal_id)
+ return; /* doesn't match ID of last challenge */
+
+ /*
+ * If we have received a duplicate or bogus Response,
+ * we have to send the same answer (Success/Failure)
+ * as we did for the first Response we saw.
+ */
+ if (cstate->serverstate == CHAPSS_OPEN) {
+ ChapSendStatus(cstate, CHAP_SUCCESS);
+ return;
+ }
+ if (cstate->serverstate == CHAPSS_BADAUTH) {
+ ChapSendStatus(cstate, CHAP_FAILURE);
+ return;
+ }
+
+ if (len < 2) {
+ CHAPDEBUG(("ChapReceiveResponse: rcvd short packet."));
+ return;
+ }
+ GETCHAR(remmd_len, inp); /* get length of MD */
+ remmd = inp; /* get pointer to MD */
+ INCPTR(remmd_len, inp);
+
+ len -= sizeof (u_char) + remmd_len;
+ if (len < 0) {
+ CHAPDEBUG(("ChapReceiveResponse: rcvd short packet."));
+ return;
+ }
+
+ UNTIMEOUT(ChapChallengeTimeout, cstate);
+
+ if (len >= sizeof(rhostname))
+ len = sizeof(rhostname) - 1;
+ BCOPY(inp, rhostname, len);
+ rhostname[len] = '\000';
+
+ /*
+ * Get secret for authenticating them with us,
+ * do the hash ourselves, and compare the result.
+ */
+ code = CHAP_FAILURE;
+ if (!get_secret(cstate->unit, (explicit_remote? remote_name: rhostname),
+ cstate->chal_name, secret, &secret_len, 1)) {
+ warn("No CHAP secret found for authenticating %q", rhostname);
+ } else {
+
+ /* generate MD based on negotiated type */
+ switch (cstate->chal_type) {
+
+ case CHAP_DIGEST_MD5:
+ CHAPDEBUG(("ChapReceiveResponse: rcvd type CHAP-DIGEST-MD5"));
+ if (remmd_len != MD5_SIGNATURE_SIZE)
+ break; /* it's not even the right length */
+ MD5Init(&mdContext);
+ MD5Update(&mdContext, &cstate->chal_id, 1);
+ MD5Update(&mdContext, secret, secret_len);
+ MD5Update(&mdContext, cstate->challenge, cstate->chal_len);
+ MD5Final(hash, &mdContext);
+
+ /* compare local and remote MDs and send the appropriate status */
+ if (memcmp (hash, remmd, MD5_SIGNATURE_SIZE) == 0)
+ code = CHAP_SUCCESS; /* they are the same! */
+ break;
+
+#ifdef CHAPMS
+ case CHAP_MICROSOFT:
+ CHAPDEBUG(("ChapReceiveResponse: rcvd type MS-CHAP-V1"));
+ if(remmd_len != MS_CHAP_RESPONSE_LEN)
+ break;
+ if(ChapMS_Resp(cstate, secret, secret_len, remmd) == 0)
+ code = CHAP_SUCCESS;
+ break;
+
+ case CHAP_MICROSOFT_V2:
+ CHAPDEBUG(("ChapReceiveResponse: rcvd type MS-CHAP-V2"));
+ if(remmd_len != MS_CHAP_RESPONSE_LEN)
+ break;
+ if(ChapMS_v2_Resp(cstate,secret,secret_len,remmd,rhostname) == 0)
+ {
+ code = CHAP_SUCCESS_R;
+ ChapMS_v2_Auth(cstate, secret, secret_len, remmd, rhostname);
+ }
+ break;
+#endif
+
+ default:
+ CHAPDEBUG(("unknown digest type %d", cstate->chal_type));
+ }
+ }
+
+ BZERO(secret, sizeof(secret));
+ ChapSendStatus(cstate, code);
+
+ if ((code == CHAP_SUCCESS) || (code == CHAP_SUCCESS_R)) {
+ old_state = cstate->serverstate;
+ cstate->serverstate = CHAPSS_OPEN;
+ if (old_state == CHAPSS_INITIAL_CHAL) {
+ auth_peer_success(cstate->unit, PPP_CHAP, rhostname, len);
+ }
+ if (cstate->chal_interval != 0)
+ TIMEOUT(ChapRechallenge, cstate, cstate->chal_interval);
+ switch (cstate->chal_type) {
+ case CHAP_DIGEST_MD5:
+ notice("CHAP peer authentication succeeded for %q", rhostname);
+ break;
+#ifdef CHAPMS
+ case CHAP_MICROSOFT:
+ notice("MSCHAP peer authentication succeeded for %q", rhostname);
+ break;
+ case CHAP_MICROSOFT_V2:
+ notice("MSCHAP-v2 peer authentication succeeded for %q", rhostname);
+ break;
+#endif
+ default:
+ notice("CHAP (unknown) peer authentication succeeded for %q",
+ rhostname);
+ break;
+ }
+ } else {
+ switch (cstate->chal_type) {
+ case CHAP_DIGEST_MD5:
+ error("CHAP peer authentication failed for remote host %q",
+ rhostname);
+ break;
+#ifdef CHAPMS
+ case CHAP_MICROSOFT:
+ error("MSCHAP peer authentication failed for remote host %q",
+ rhostname);
+ break;
+ case CHAP_MICROSOFT_V2:
+ error("MSCHAP-v2 peer authentication failed for remote host %q",
+ rhostname);
+ break;
+#endif
+ default:
+ error("CHAP (unknown) peer authentication failed for remote host %q", rhostname);
+ break;
+ }
+ cstate->serverstate = CHAPSS_BADAUTH;
+ auth_peer_fail(cstate->unit, PPP_CHAP);
+ }
+}
+
+/*
+ * ChapReceiveSuccess - Receive Success
+ */
+static void
+ChapReceiveSuccess(cstate, inp, id, len)
+ chap_state *cstate;
+ u_char *inp;
+ u_char id;
+ int len;
+{
+
+ if (cstate->clientstate == CHAPCS_OPEN)
+ /* presumably an answer to a duplicate response */
+ return;
+
+ if (cstate->clientstate != CHAPCS_RESPONSE) {
+ /* don't know what this is */
+ CHAPDEBUG(("ChapReceiveSuccess: in state %d\n", cstate->clientstate));
+ return;
+ }
+
+ UNTIMEOUT(ChapResponseTimeout, cstate);
+
+ /*
+ * Print message.
+ */
+ if (len > 0)
+ PRINTMSG(inp, len);
+
+ cstate->clientstate = CHAPCS_OPEN;
+
+ auth_withpeer_success(cstate->unit, PPP_CHAP);
+}
+
+
+/*
+ * ChapReceiveFailure - Receive failure.
+ */
+static void
+ChapReceiveFailure(cstate, inp, id, len)
+ chap_state *cstate;
+ u_char *inp;
+ u_char id;
+ int len;
+{
+ if (cstate->clientstate != CHAPCS_RESPONSE) {
+ /* don't know what this is */
+ CHAPDEBUG(("ChapReceiveFailure: in state %d\n", cstate->clientstate));
+ return;
+ }
+
+ UNTIMEOUT(ChapResponseTimeout, cstate);
+
+ /*
+ * Print message.
+ */
+ if (len > 0)
+ PRINTMSG(inp, len);
+
+ error("CHAP authentication failed");
+
+ //log_to_file("CHAP_AUTH_FAIL");
+ system("ppp_event -t CHAP_AUTH_FAIL &");
+
+ auth_withpeer_fail(cstate->unit, PPP_CHAP);
+}
+
+
+/*
+ * ChapSendChallenge - Send an Authenticate challenge.
+ */
+static void
+ChapSendChallenge(cstate)
+ chap_state *cstate;
+{
+ u_char *outp;
+ int chal_len, name_len;
+ int outlen;
+
+ chal_len = cstate->chal_len;
+ name_len = strlen(cstate->chal_name);
+ outlen = CHAP_HEADERLEN + sizeof (u_char) + chal_len + name_len;
+ outp = outpacket_buf;
+
+ MAKEHEADER(outp, PPP_CHAP); /* paste in a CHAP header */
+
+ PUTCHAR(CHAP_CHALLENGE, outp);
+ PUTCHAR(cstate->chal_id, outp);
+ PUTSHORT(outlen, outp);
+
+ PUTCHAR(chal_len, outp); /* put length of challenge */
+ BCOPY(cstate->challenge, outp, chal_len);
+ INCPTR(chal_len, outp);
+
+ BCOPY(cstate->chal_name, outp, name_len); /* append hostname */
+
+ output(cstate->unit, outpacket_buf, outlen + PPP_HDRLEN);
+
+ TIMEOUT(ChapChallengeTimeout, cstate, cstate->timeouttime);
+ ++cstate->chal_transmits;
+}
+
+
+/*
+ * ChapSendStatus - Send a status response (ack or nak).
+ */
+static void
+ChapSendStatus(cstate, code)
+ chap_state *cstate;
+ int code;
+{
+ u_char *outp;
+ int outlen, msglen;
+ char msg[256];
+
+ if (code == CHAP_SUCCESS)
+ slprintf(msg, sizeof(msg), "Welcome to %s.", hostname);
+ else if(code == CHAP_SUCCESS_R)
+ strcpy(msg, cstate->response);
+ else
+ slprintf(msg, sizeof(msg), "I don't like you. Go 'way.");
+ msglen = strlen(msg);
+
+ outlen = CHAP_HEADERLEN + msglen;
+ outp = outpacket_buf;
+
+ MAKEHEADER(outp, PPP_CHAP); /* paste in a header */
+
+ PUTCHAR(code == CHAP_SUCCESS_R ? CHAP_SUCCESS : code, outp);
+ PUTCHAR(cstate->chal_id, outp);
+ PUTSHORT(outlen, outp);
+ BCOPY(msg, outp, msglen);
+ output(cstate->unit, outpacket_buf, outlen + PPP_HDRLEN);
+}
+
+/*
+ * ChapGenChallenge is used to generate a pseudo-random challenge string of
+ * a pseudo-random length between min_len and max_len. The challenge
+ * string and its length are stored in *cstate, and various other fields of
+ * *cstate are initialized.
+ */
+
+void
+ChapGenChallenge(cstate)
+ chap_state *cstate;
+{
+ int chal_len;
+ u_char *ptr = cstate->challenge;
+ int i;
+
+#ifdef CHAPMS
+ if(cstate->chal_type == CHAP_MICROSOFT)
+ chal_len = 8;
+ else if(cstate->chal_type == CHAP_MICROSOFT_V2)
+ chal_len = 16;
+ else
+#endif
+
+ /* pick a random challenge length between MIN_CHALLENGE_LENGTH and
+ MAX_CHALLENGE_LENGTH */
+ chal_len = (unsigned) ((drand48() *
+ (MAX_CHALLENGE_LENGTH - MIN_CHALLENGE_LENGTH)) +
+ MIN_CHALLENGE_LENGTH);
+ cstate->chal_len = chal_len;
+ cstate->chal_id = ++cstate->id;
+ cstate->chal_transmits = 0;
+
+ /* generate a random string */
+ for (i = 0; i < chal_len; i++)
+ *ptr++ = (char) (drand48() * 0xff);
+}
+
+/*
+ * ChapSendResponse - send a response packet with values as specified
+ * in *cstate.
+ */
+/* ARGSUSED */
+static void
+ChapSendResponse(cstate)
+ chap_state *cstate;
+{
+ u_char *outp;
+ int outlen, md_len, name_len;
+
+ md_len = cstate->resp_length;
+ name_len = strlen(cstate->resp_name);
+ outlen = CHAP_HEADERLEN + sizeof (u_char) + md_len + name_len;
+ outp = outpacket_buf;
+
+ MAKEHEADER(outp, PPP_CHAP);
+
+ PUTCHAR(CHAP_RESPONSE, outp); /* we are a response */
+ PUTCHAR(cstate->resp_id, outp); /* copy id from challenge packet */
+ PUTSHORT(outlen, outp); /* packet length */
+
+ PUTCHAR(md_len, outp); /* length of MD */
+ BCOPY(cstate->response, outp, md_len); /* copy MD to buffer */
+ INCPTR(md_len, outp);
+
+ BCOPY(cstate->resp_name, outp, name_len); /* append our name */
+
+ /* send the packet */
+ output(cstate->unit, outpacket_buf, outlen + PPP_HDRLEN);
+
+ cstate->clientstate = CHAPCS_RESPONSE;
+ TIMEOUT(ChapResponseTimeout, cstate, cstate->timeouttime);
+ ++cstate->resp_transmits;
+}
+
+/*
+ * ChapPrintPkt - print the contents of a CHAP packet.
+ */
+static char *ChapCodenames[] = {
+ "Challenge", "Response", "Success", "Failure"
+};
+
+static int
+ChapPrintPkt(p, plen, printer, arg)
+ u_char *p;
+ int plen;
+ void (*printer) __P((void *, char *, ...));
+ void *arg;
+{
+ int code, id, len;
+ int clen, nlen;
+ u_char x;
+
+ if (plen < CHAP_HEADERLEN)
+ return 0;
+ GETCHAR(code, p);
+ GETCHAR(id, p);
+ GETSHORT(len, p);
+ if (len < CHAP_HEADERLEN || len > plen)
+ return 0;
+
+ if (code >= 1 && code <= sizeof(ChapCodenames) / sizeof(char *))
+ printer(arg, " %s", ChapCodenames[code-1]);
+ else
+ printer(arg, " code=0x%x", code);
+ printer(arg, " id=0x%x", id);
+ len -= CHAP_HEADERLEN;
+ switch (code) {
+ case CHAP_CHALLENGE:
+ case CHAP_RESPONSE:
+ if (len < 1)
+ break;
+ clen = p[0];
+ if (len < clen + 1)
+ break;
+ ++p;
+ nlen = len - clen - 1;
+ printer(arg, " <");
+ for (; clen > 0; --clen) {
+ GETCHAR(x, p);
+ printer(arg, "%.2x", x);
+ }
+ printer(arg, ">, name = ");
+ print_string((char *)p, nlen, printer, arg);
+ break;
+ case CHAP_FAILURE:
+ case CHAP_SUCCESS:
+ printer(arg, " ");
+ print_string((char *)p, len, printer, arg);
+ break;
+ default:
+ for (clen = len; clen > 0; --clen) {
+ GETCHAR(x, p);
+ printer(arg, " %.2x", x);
+ }
+ }
+
+ return len + CHAP_HEADERLEN;
+}
+
+int
+reqchap(argv)
+ char **argv;
+{
+ lcp_wantoptions[0].neg_chap = 1;
+ lcp_wantoptions[0].use_digest = 1;
+ auth_required = 1;
+ return 1;
+}