X-Git-Url: http://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=pppd%2Fchap.c;h=b8a5d0f726ffe9f723d1eaf344a52d45b1591ef9;hp=c8ac58a35d1ff84d630b6214fec72f0760dfcb2d;hb=31b4bba68d46b38119fd8620ee09ff7f8831f4b5;hpb=077386e12afee1218fff48119f52680cd8f86ed5 diff --git a/pppd/chap.c b/pppd/chap.c index c8ac58a..b8a5d0f 100644 --- a/pppd/chap.c +++ b/pppd/chap.c @@ -1,5 +1,20 @@ /* - * chap.c - Crytographic Handshake Authentication Protocol. + * 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. @@ -18,9 +33,7 @@ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ -#ifndef lint -static char rcsid[] = "$Id: chap.c,v 1.10 1996/01/01 22:55:28 paulus Exp $"; -#endif +#define RCSID "$Id: chap.c,v 1.23 1999/08/13 06:46:11 paulus Exp $" /* * TODO: @@ -30,23 +43,70 @@ static char rcsid[] = "$Id: chap.c,v 1.10 1996/01/01 22:55:28 paulus Exp $"; #include #include #include -#include #include "pppd.h" #include "chap.h" #include "md5.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" }, + { "chap-max-challenge", o_int, &chap[0].max_transmits, + "Set max #xmits for challenge" }, + { "chap-interval", o_int, &chap[0].chal_interval, + "Set interval for rechallenge" }, +#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, NULL + 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((caddr_t)); -static void ChapResponseTimeout __P((caddr_t)); +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)); @@ -61,7 +121,7 @@ extern void srand48 __P((long)); /* * ChapInit - Initialize a CHAP unit. */ -void +static void ChapInit(unit) int unit; { @@ -140,7 +200,7 @@ ChapAuthPeer(unit, our_name, digest) */ static void ChapChallengeTimeout(arg) - caddr_t arg; + void *arg; { chap_state *cstate = (chap_state *) arg; @@ -152,7 +212,7 @@ ChapChallengeTimeout(arg) if (cstate->chal_transmits >= cstate->max_transmits) { /* give up on peer */ - syslog(LOG_ERR, "Peer failed to respond to CHAP challenge"); + error("Peer failed to respond to CHAP challenge"); cstate->serverstate = CHAPSS_BADAUTH; auth_peer_fail(cstate->unit, PPP_CHAP); return; @@ -167,7 +227,7 @@ ChapChallengeTimeout(arg) */ static void ChapResponseTimeout(arg) - caddr_t arg; + void *arg; { chap_state *cstate = (chap_state *) arg; @@ -184,7 +244,7 @@ ChapResponseTimeout(arg) */ static void ChapRechallenge(arg) - caddr_t arg; + void *arg; { chap_state *cstate = (chap_state *) arg; @@ -203,7 +263,7 @@ ChapRechallenge(arg) * * Start up if we have pending requests. */ -void +static void ChapLowerUp(unit) int unit; { @@ -229,7 +289,7 @@ ChapLowerUp(unit) * * Cancel all timeouts. */ -void +static void ChapLowerDown(unit) int unit; { @@ -238,12 +298,12 @@ ChapLowerDown(unit) /* Timeout(s) pending? Cancel if so. */ if (cstate->serverstate == CHAPSS_INITIAL_CHAL || cstate->serverstate == CHAPSS_RECHALLENGE) - UNTIMEOUT(ChapChallengeTimeout, (caddr_t) cstate); + UNTIMEOUT(ChapChallengeTimeout, cstate); else if (cstate->serverstate == CHAPSS_OPEN && cstate->chal_interval != 0) - UNTIMEOUT(ChapRechallenge, (caddr_t) cstate); + UNTIMEOUT(ChapRechallenge, cstate); if (cstate->clientstate == CHAPCS_RESPONSE) - UNTIMEOUT(ChapResponseTimeout, (caddr_t) cstate); + UNTIMEOUT(ChapResponseTimeout, cstate); cstate->clientstate = CHAPCS_INITIAL; cstate->serverstate = CHAPSS_INITIAL; @@ -253,7 +313,7 @@ ChapLowerDown(unit) /* * ChapProtocolReject - Peer doesn't grok CHAP. */ -void +static void ChapProtocolReject(unit) int unit; { @@ -272,7 +332,7 @@ ChapProtocolReject(unit) /* * ChapInput - Input CHAP packet. */ -void +static void ChapInput(unit, inpacket, packet_len) int unit; u_char *inpacket; @@ -289,18 +349,18 @@ ChapInput(unit, inpacket, packet_len) */ inp = inpacket; if (packet_len < CHAP_HEADERLEN) { - CHAPDEBUG((LOG_INFO, "ChapInput: rcvd short header.")); + CHAPDEBUG(("ChapInput: rcvd short header.")); return; } GETCHAR(code, inp); GETCHAR(id, inp); GETSHORT(len, inp); if (len < CHAP_HEADERLEN) { - CHAPDEBUG((LOG_INFO, "ChapInput: rcvd illegal length.")); + CHAPDEBUG(("ChapInput: rcvd illegal length.")); return; } if (len > packet_len) { - CHAPDEBUG((LOG_INFO, "ChapInput: rcvd short packet.")); + CHAPDEBUG(("ChapInput: rcvd short packet.")); return; } len -= CHAP_HEADERLEN; @@ -326,7 +386,7 @@ ChapInput(unit, inpacket, packet_len) break; default: /* Need code reject? */ - syslog(LOG_WARNING, "Unknown CHAP code (%d) received.", code); + warn("Unknown CHAP code (%d) received.", code); break; } } @@ -348,24 +408,23 @@ ChapReceiveChallenge(cstate, inp, id, len) char secret[MAXSECRETLEN]; char rhostname[256]; MD5_CTX mdContext; + u_char hash[MD5_SIGNATURE_SIZE]; - CHAPDEBUG((LOG_INFO, "ChapReceiveChallenge: Rcvd id %d.", id)); if (cstate->clientstate == CHAPCS_CLOSED || cstate->clientstate == CHAPCS_PENDING) { - CHAPDEBUG((LOG_INFO, "ChapReceiveChallenge: in state %d", - cstate->clientstate)); + CHAPDEBUG(("ChapReceiveChallenge: in state %d", cstate->clientstate)); return; } if (len < 2) { - CHAPDEBUG((LOG_INFO, "ChapReceiveChallenge: rcvd short packet.")); + CHAPDEBUG(("ChapReceiveChallenge: rcvd short packet.")); return; } GETCHAR(rchallenge_len, inp); len -= sizeof (u_char) + rchallenge_len; /* now name field length */ if (len < 0) { - CHAPDEBUG((LOG_INFO, "ChapReceiveChallenge: rcvd short packet.")); + CHAPDEBUG(("ChapReceiveChallenge: rcvd short packet.")); return; } rchallenge = inp; @@ -376,20 +435,23 @@ ChapReceiveChallenge(cstate, inp, id, len) BCOPY(inp, rhostname, len); rhostname[len] = '\000'; - CHAPDEBUG((LOG_INFO, "ChapReceiveChallenge: received name field: %s", - rhostname)); + /* 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 */ - syslog(LOG_WARNING, "No CHAP secret found for authenticating us to %s", - rhostname); + warn("No CHAP secret found for authenticating us to %q", rhostname); } /* cancel response send timeout if necessary */ if (cstate->clientstate == CHAPCS_RESPONSE) - UNTIMEOUT(ChapResponseTimeout, (caddr_t) cstate); + UNTIMEOUT(ChapResponseTimeout, cstate); cstate->resp_id = id; cstate->resp_transmits = 0; @@ -397,21 +459,28 @@ ChapReceiveChallenge(cstate, inp, id, len) /* generate MD based on negotiated type */ switch (cstate->resp_type) { - case CHAP_DIGEST_MD5: /* only MD5 is defined for now */ + case CHAP_DIGEST_MD5: MD5Init(&mdContext); MD5Update(&mdContext, &cstate->resp_id, 1); MD5Update(&mdContext, secret, secret_len); MD5Update(&mdContext, rchallenge, rchallenge_len); - MD5Final(&mdContext); - BCOPY(mdContext.digest, cstate->response, MD5_SIGNATURE_SIZE); + MD5Final(hash, &mdContext); + BCOPY(hash, cstate->response, MD5_SIGNATURE_SIZE); cstate->resp_length = MD5_SIGNATURE_SIZE; break; +#ifdef CHAPMS + case CHAP_MICROSOFT: + ChapMS(cstate, rchallenge, rchallenge_len, secret, secret_len); + break; +#endif + default: - CHAPDEBUG((LOG_INFO, "unknown digest type %d", cstate->resp_type)); + CHAPDEBUG(("unknown digest type %d", cstate->resp_type)); return; } + BZERO(secret, sizeof(secret)); ChapSendResponse(cstate); } @@ -430,17 +499,13 @@ ChapReceiveResponse(cstate, inp, id, len) int secret_len, old_state; int code; char rhostname[256]; - u_char buf[256]; MD5_CTX mdContext; - u_char msg[256]; char secret[MAXSECRETLEN]; - - CHAPDEBUG((LOG_INFO, "ChapReceiveResponse: Rcvd id %d.", id)); + u_char hash[MD5_SIGNATURE_SIZE]; if (cstate->serverstate == CHAPSS_CLOSED || cstate->serverstate == CHAPSS_PENDING) { - CHAPDEBUG((LOG_INFO, "ChapReceiveResponse: in state %d", - cstate->serverstate)); + CHAPDEBUG(("ChapReceiveResponse: in state %d", cstate->serverstate)); return; } @@ -462,7 +527,7 @@ ChapReceiveResponse(cstate, inp, id, len) } if (len < 2) { - CHAPDEBUG((LOG_INFO, "ChapReceiveResponse: rcvd short packet.")); + CHAPDEBUG(("ChapReceiveResponse: rcvd short packet.")); return; } GETCHAR(remmd_len, inp); /* get length of MD */ @@ -471,29 +536,25 @@ ChapReceiveResponse(cstate, inp, id, len) len -= sizeof (u_char) + remmd_len; if (len < 0) { - CHAPDEBUG((LOG_INFO, "ChapReceiveResponse: rcvd short packet.")); + CHAPDEBUG(("ChapReceiveResponse: rcvd short packet.")); return; } - UNTIMEOUT(ChapChallengeTimeout, (caddr_t) cstate); + UNTIMEOUT(ChapChallengeTimeout, cstate); if (len >= sizeof(rhostname)) len = sizeof(rhostname) - 1; BCOPY(inp, rhostname, len); rhostname[len] = '\000'; - CHAPDEBUG((LOG_INFO, "ChapReceiveResponse: received name field: %s", - rhostname)); - /* * Get secret for authenticating them with us, * do the hash ourselves, and compare the result. */ code = CHAP_FAILURE; - if (!get_secret(cstate->unit, rhostname, cstate->chal_name, - secret, &secret_len, 1)) { - syslog(LOG_WARNING, "No CHAP secret found for authenticating %s", - rhostname); + 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 */ @@ -506,31 +567,33 @@ ChapReceiveResponse(cstate, inp, id, len) MD5Update(&mdContext, &cstate->chal_id, 1); MD5Update(&mdContext, secret, secret_len); MD5Update(&mdContext, cstate->challenge, cstate->chal_len); - MD5Final(&mdContext); + MD5Final(hash, &mdContext); /* compare local and remote MDs and send the appropriate status */ - if (memcmp (mdContext.digest, remmd, MD5_SIGNATURE_SIZE) == 0) + if (memcmp (hash, remmd, MD5_SIGNATURE_SIZE) == 0) code = CHAP_SUCCESS; /* they are the same! */ break; default: - CHAPDEBUG((LOG_INFO, "unknown digest type %d", cstate->chal_type)); + CHAPDEBUG(("unknown digest type %d", cstate->chal_type)); } } + BZERO(secret, sizeof(secret)); ChapSendStatus(cstate, code); if (code == CHAP_SUCCESS) { old_state = cstate->serverstate; cstate->serverstate = CHAPSS_OPEN; if (old_state == CHAPSS_INITIAL_CHAL) { - auth_peer_success(cstate->unit, PPP_CHAP); + auth_peer_success(cstate->unit, PPP_CHAP, rhostname, len); } if (cstate->chal_interval != 0) - TIMEOUT(ChapRechallenge, (caddr_t) cstate, cstate->chal_interval); + TIMEOUT(ChapRechallenge, cstate, cstate->chal_interval); + notice("CHAP peer authentication succeeded for %q", rhostname); } else { - syslog(LOG_ERR, "CHAP peer authentication failed"); + error("CHAP peer authentication failed for remote host %q", rhostname); cstate->serverstate = CHAPSS_BADAUTH; auth_peer_fail(cstate->unit, PPP_CHAP); } @@ -547,20 +610,17 @@ ChapReceiveSuccess(cstate, inp, id, len) int len; { - CHAPDEBUG((LOG_INFO, "ChapReceiveSuccess: Rcvd id %d.", id)); - 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((LOG_INFO, "ChapReceiveSuccess: in state %d\n", - cstate->clientstate)); + CHAPDEBUG(("ChapReceiveSuccess: in state %d\n", cstate->clientstate)); return; } - UNTIMEOUT(ChapResponseTimeout, (caddr_t) cstate); + UNTIMEOUT(ChapResponseTimeout, cstate); /* * Print message. @@ -584,19 +644,13 @@ ChapReceiveFailure(cstate, inp, id, len) u_char id; int len; { - u_char msglen; - u_char *msg; - - CHAPDEBUG((LOG_INFO, "ChapReceiveFailure: Rcvd id %d.", id)); - if (cstate->clientstate != CHAPCS_RESPONSE) { /* don't know what this is */ - CHAPDEBUG((LOG_INFO, "ChapReceiveFailure: in state %d\n", - cstate->clientstate)); + CHAPDEBUG(("ChapReceiveFailure: in state %d\n", cstate->clientstate)); return; } - UNTIMEOUT(ChapResponseTimeout, (caddr_t) cstate); + UNTIMEOUT(ChapResponseTimeout, cstate); /* * Print message. @@ -604,7 +658,7 @@ ChapReceiveFailure(cstate, inp, id, len) if (len > 0) PRINTMSG(inp, len); - syslog(LOG_ERR, "CHAP authentication failed"); + error("CHAP authentication failed"); auth_withpeer_fail(cstate->unit, PPP_CHAP); } @@ -639,9 +693,7 @@ ChapSendChallenge(cstate) output(cstate->unit, outpacket_buf, outlen + PPP_HDRLEN); - CHAPDEBUG((LOG_INFO, "ChapSendChallenge: Sent id %d.", cstate->chal_id)); - - TIMEOUT(ChapChallengeTimeout, (caddr_t) cstate, cstate->timeouttime); + TIMEOUT(ChapChallengeTimeout, cstate, cstate->timeouttime); ++cstate->chal_transmits; } @@ -659,9 +711,9 @@ ChapSendStatus(cstate, code) char msg[256]; if (code == CHAP_SUCCESS) - sprintf(msg, "Welcome to %s.", hostname); + slprintf(msg, sizeof(msg), "Welcome to %s.", hostname); else - sprintf(msg, "I don't like you. Go 'way."); + slprintf(msg, sizeof(msg), "I don't like you. Go 'way."); msglen = strlen(msg); outlen = CHAP_HEADERLEN + msglen; @@ -674,9 +726,6 @@ ChapSendStatus(cstate, code) PUTSHORT(outlen, outp); BCOPY(msg, outp, msglen); output(cstate->unit, outpacket_buf, outlen + PPP_HDRLEN); - - CHAPDEBUG((LOG_INFO, "ChapSendStatus: Sent code %d, id %d.", code, - cstate->chal_id)); } /* @@ -741,18 +790,18 @@ ChapSendResponse(cstate) output(cstate->unit, outpacket_buf, outlen + PPP_HDRLEN); cstate->clientstate = CHAPCS_RESPONSE; - TIMEOUT(ChapResponseTimeout, (caddr_t) cstate, cstate->timeouttime); + TIMEOUT(ChapResponseTimeout, cstate, cstate->timeouttime); ++cstate->resp_transmits; } /* * ChapPrintPkt - print the contents of a CHAP packet. */ -char *ChapCodenames[] = { +static char *ChapCodenames[] = { "Challenge", "Response", "Success", "Failure" }; -int +static int ChapPrintPkt(p, plen, printer, arg) u_char *p; int plen;