chap.c revision 63484
16059Samurai/* 26059Samurai * PPP CHAP Module 36059Samurai * 46059Samurai * Written by Toshiharu OHNO (tony-o@iij.ad.jp) 56059Samurai * 66059Samurai * Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd. 76059Samurai * 86059Samurai * Redistribution and use in source and binary forms are permitted 96059Samurai * provided that the above copyright notice and this paragraph are 106059Samurai * duplicated in all such forms and that any documentation, 116059Samurai * advertising materials, and other materials related to such 126059Samurai * distribution and use acknowledge that the software was developed 136059Samurai * by the Internet Initiative Japan, Inc. The name of the 146059Samurai * IIJ may not be used to endorse or promote products derived 156059Samurai * from this software without specific prior written permission. 166059Samurai * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 176059Samurai * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 186059Samurai * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 198857Srgrimes * 2050479Speter * $FreeBSD: head/usr.sbin/ppp/chap.c 63484 2000-07-19 02:10:35Z brian $ 218857Srgrimes * 226059Samurai * TODO: 236059Samurai */ 2443313Sbrian#include <sys/param.h> 2530715Sbrian#include <netinet/in.h> 2636285Sbrian#include <netinet/in_systm.h> 2736285Sbrian#include <netinet/ip.h> 2836285Sbrian#include <sys/un.h> 2930715Sbrian 3043888Sbrian#include <errno.h> 3143888Sbrian#include <fcntl.h> 3237192Sbrian#ifdef HAVE_DES 3336287Sbrian#include <md4.h> 3437192Sbrian#endif 3530715Sbrian#include <md5.h> 3643888Sbrian#include <paths.h> 3743888Sbrian#include <signal.h> 3849976Sbrian#include <stdio.h> 3930715Sbrian#include <stdlib.h> 4044106Sbrian#include <string.h> 4143888Sbrian#include <sys/wait.h> 4236285Sbrian#include <termios.h> 4343888Sbrian#include <unistd.h> 4429840Sbrian 4546686Sbrian#include "layer.h" 4630715Sbrian#include "mbuf.h" 4730715Sbrian#include "log.h" 4830715Sbrian#include "defs.h" 4930715Sbrian#include "timer.h" 506059Samurai#include "fsm.h" 5146686Sbrian#include "proto.h" 5236285Sbrian#include "lqr.h" 536059Samurai#include "hdlc.h" 5463484Sbrian#include "lcp.h" 556735Samurai#include "auth.h" 5636285Sbrian#include "async.h" 5736285Sbrian#include "throughput.h" 5836285Sbrian#include "descriptor.h" 5943888Sbrian#include "chap.h" 6036285Sbrian#include "iplist.h" 6136285Sbrian#include "slcompress.h" 6236285Sbrian#include "ipcp.h" 6336285Sbrian#include "filter.h" 6436285Sbrian#include "ccp.h" 6536285Sbrian#include "link.h" 6636285Sbrian#include "physical.h" 6736285Sbrian#include "mp.h" 6843313Sbrian#ifndef NORADIUS 6943313Sbrian#include "radius.h" 7043313Sbrian#endif 7136285Sbrian#include "bundle.h" 7236285Sbrian#include "chat.h" 7338174Sbrian#include "cbcp.h" 7443888Sbrian#include "command.h" 7536285Sbrian#include "datalink.h" 7637192Sbrian#ifdef HAVE_DES 7736287Sbrian#include "chap_ms.h" 7837192Sbrian#endif 7955253Sbrian#include "id.h" 806059Samurai 8155146Sbrianstatic const char * const chapcodes[] = { 8219866Sphk "???", "CHALLENGE", "RESPONSE", "SUCCESS", "FAILURE" 836059Samurai}; 8443693Sbrian#define MAXCHAPCODE (sizeof chapcodes / sizeof chapcodes[0] - 1) 856059Samurai 8630715Sbrianstatic void 8736285SbrianChapOutput(struct physical *physical, u_int code, u_int id, 8843693Sbrian const u_char *ptr, int count, const char *text) 896059Samurai{ 906059Samurai int plen; 916059Samurai struct fsmheader lh; 926059Samurai struct mbuf *bp; 936059Samurai 9428679Sbrian plen = sizeof(struct fsmheader) + count; 956059Samurai lh.code = code; 966059Samurai lh.id = id; 976059Samurai lh.length = htons(plen); 9854912Sbrian bp = m_get(plen, MB_CHAPOUT); 9930715Sbrian memcpy(MBUF_CTOP(bp), &lh, sizeof(struct fsmheader)); 1006059Samurai if (count) 10130715Sbrian memcpy(MBUF_CTOP(bp) + sizeof(struct fsmheader), ptr, count); 10236285Sbrian log_DumpBp(LogDEBUG, "ChapOutput", bp); 10337926Sbrian if (text == NULL) 10437926Sbrian log_Printf(LogPHASE, "Chap Output: %s\n", chapcodes[code]); 10537926Sbrian else 10637926Sbrian log_Printf(LogPHASE, "Chap Output: %s (%s)\n", chapcodes[code], text); 10746686Sbrian link_PushPacket(&physical->link, bp, physical->dl->bundle, 10850867Sbrian LINK_QUEUES(&physical->link) - 1, PROTO_CHAP); 1096059Samurai} 1106059Samurai 11143693Sbrianstatic char * 11244123Sbrianchap_BuildAnswer(char *name, char *key, u_char id, char *challenge, u_char type 11344123Sbrian#ifdef HAVE_DES 11444123Sbrian , int lanman 11544123Sbrian#endif 11644123Sbrian ) 1176059Samurai{ 11843693Sbrian char *result, *digest; 11943693Sbrian size_t nlen, klen; 12043693Sbrian 12143693Sbrian nlen = strlen(name); 12243693Sbrian klen = strlen(key); 12343693Sbrian 12443693Sbrian#ifdef HAVE_DES 12544106Sbrian if (type == 0x80) { 12643693Sbrian char expkey[AUTHLEN << 2]; 12743693Sbrian MD4_CTX MD4context; 12843693Sbrian int f; 12943693Sbrian 13043693Sbrian if ((result = malloc(1 + nlen + MS_CHAP_RESPONSE_LEN)) == NULL) 13143693Sbrian return result; 13243693Sbrian 13344106Sbrian digest = result; /* the response */ 13444106Sbrian *digest++ = MS_CHAP_RESPONSE_LEN; /* 49 */ 13544106Sbrian memcpy(digest + MS_CHAP_RESPONSE_LEN, name, nlen); 13644106Sbrian if (lanman) { 13744106Sbrian memset(digest + 24, '\0', 25); 13844106Sbrian mschap_LANMan(digest, challenge + 1, key); /* LANMan response */ 13944106Sbrian } else { 14044106Sbrian memset(digest, '\0', 25); 14144106Sbrian digest += 24; 14243693Sbrian 14344106Sbrian for (f = 0; f < klen; f++) { 14444106Sbrian expkey[2*f] = key[f]; 14544106Sbrian expkey[2*f+1] = '\0'; 14644106Sbrian } 14744106Sbrian /* 14844106Sbrian * ----------- 14944106Sbrian * expkey = | k\0e\0y\0 | 15044106Sbrian * ----------- 15144106Sbrian */ 15244106Sbrian MD4Init(&MD4context); 15344106Sbrian MD4Update(&MD4context, expkey, klen << 1); 15444106Sbrian MD4Final(digest, &MD4context); 15544106Sbrian 15644106Sbrian /* 15744106Sbrian * ---- -------- ---------------- ------- ------ 15844106Sbrian * result = | 49 | LANMan | 16 byte digest | 9 * ? | name | 15944106Sbrian * ---- -------- ---------------- ------- ------ 16044106Sbrian */ 16144106Sbrian mschap_NT(digest, challenge + 1); 16243693Sbrian } 16343693Sbrian /* 16444106Sbrian * ---- -------- ------------- ----- ------ 16544106Sbrian * | | struct MS_ChapResponse24 | | 16644106Sbrian * result = | 49 | LANMan | NT digest | 0/1 | name | 16744106Sbrian * ---- -------- ------------- ----- ------ 16844106Sbrian * where only one of LANMan & NT digest are set. 16943693Sbrian */ 17043693Sbrian } else 17143693Sbrian#endif 17243693Sbrian if ((result = malloc(nlen + 17)) != NULL) { 17343693Sbrian /* Normal MD5 stuff */ 17443693Sbrian MD5_CTX MD5context; 17543693Sbrian 17643693Sbrian digest = result; 17743693Sbrian *digest++ = 16; /* value size */ 17843693Sbrian 17943693Sbrian MD5Init(&MD5context); 18043693Sbrian MD5Update(&MD5context, &id, 1); 18143693Sbrian MD5Update(&MD5context, key, klen); 18243693Sbrian MD5Update(&MD5context, challenge + 1, *challenge); 18343693Sbrian MD5Final(digest, &MD5context); 18443693Sbrian 18543693Sbrian memcpy(digest + 16, name, nlen); 18643693Sbrian /* 18743693Sbrian * ---- -------- ------ 18843693Sbrian * result = | 16 | digest | name | 18943693Sbrian * ---- -------- ------ 19043693Sbrian */ 19143693Sbrian } 19243693Sbrian 19343693Sbrian return result; 19443693Sbrian} 19543693Sbrian 19643693Sbrianstatic void 19743888Sbrianchap_StartChild(struct chap *chap, char *prog, const char *name) 19843888Sbrian{ 19943888Sbrian char *argv[MAXARGS], *nargv[MAXARGS]; 20043888Sbrian int argc, fd; 20143888Sbrian int in[2], out[2]; 20247849Sbrian pid_t pid; 20343888Sbrian 20443888Sbrian if (chap->child.fd != -1) { 20543888Sbrian log_Printf(LogWARN, "Chap: %s: Program already running\n", prog); 20643888Sbrian return; 20743888Sbrian } 20843888Sbrian 20943888Sbrian if (pipe(in) == -1) { 21043888Sbrian log_Printf(LogERROR, "Chap: pipe: %s\n", strerror(errno)); 21143888Sbrian return; 21243888Sbrian } 21343888Sbrian 21443888Sbrian if (pipe(out) == -1) { 21543888Sbrian log_Printf(LogERROR, "Chap: pipe: %s\n", strerror(errno)); 21643888Sbrian close(in[0]); 21743888Sbrian close(in[1]); 21843888Sbrian return; 21943888Sbrian } 22043888Sbrian 22147849Sbrian pid = getpid(); 22243888Sbrian switch ((chap->child.pid = fork())) { 22343888Sbrian case -1: 22443888Sbrian log_Printf(LogERROR, "Chap: fork: %s\n", strerror(errno)); 22543888Sbrian close(in[0]); 22643888Sbrian close(in[1]); 22743888Sbrian close(out[0]); 22843888Sbrian close(out[1]); 22943888Sbrian chap->child.pid = 0; 23043888Sbrian return; 23143888Sbrian 23243888Sbrian case 0: 23343888Sbrian timer_TermService(); 23454914Sbrian 23554914Sbrian if ((argc = command_Interpret(prog, strlen(prog), argv)) <= 0) { 23654914Sbrian if (argc < 0) { 23754914Sbrian log_Printf(LogWARN, "CHAP: Invalid command syntax\n"); 23854914Sbrian _exit(255); 23954914Sbrian } 24054914Sbrian _exit(0); 24154914Sbrian } 24254914Sbrian 24343888Sbrian close(in[1]); 24443888Sbrian close(out[0]); 24549976Sbrian if (out[1] == STDIN_FILENO) 24649976Sbrian out[1] = dup(out[1]); 24743888Sbrian dup2(in[0], STDIN_FILENO); 24843888Sbrian dup2(out[1], STDOUT_FILENO); 24949976Sbrian close(STDERR_FILENO); 25049976Sbrian if (open(_PATH_DEVNULL, O_RDWR) != STDERR_FILENO) { 25143888Sbrian log_Printf(LogALERT, "Chap: Failed to open %s: %s\n", 25243888Sbrian _PATH_DEVNULL, strerror(errno)); 25343888Sbrian exit(1); 25443888Sbrian } 25549976Sbrian for (fd = getdtablesize(); fd > STDERR_FILENO; fd--) 25649976Sbrian fcntl(fd, F_SETFD, 1); 25755252Sbrian setuid(ID0realuid()); 25843888Sbrian command_Expand(nargv, argc, (char const *const *)argv, 25947849Sbrian chap->auth.physical->dl->bundle, 0, pid); 26043888Sbrian execvp(nargv[0], nargv); 26149976Sbrian printf("exec() of %s failed: %s\n", nargv[0], strerror(errno)); 26249976Sbrian _exit(255); 26343888Sbrian 26443888Sbrian default: 26543888Sbrian close(in[0]); 26643888Sbrian close(out[1]); 26743888Sbrian chap->child.fd = out[0]; 26843888Sbrian chap->child.buf.len = 0; 26943888Sbrian write(in[1], chap->auth.in.name, strlen(chap->auth.in.name)); 27043888Sbrian write(in[1], "\n", 1); 27145907Sbrian write(in[1], chap->challenge.peer + 1, *chap->challenge.peer); 27243888Sbrian write(in[1], "\n", 1); 27343888Sbrian write(in[1], name, strlen(name)); 27443888Sbrian write(in[1], "\n", 1); 27543888Sbrian close(in[1]); 27643888Sbrian break; 27743888Sbrian } 27843888Sbrian} 27943888Sbrian 28043888Sbrianstatic void 28143888Sbrianchap_Cleanup(struct chap *chap, int sig) 28243888Sbrian{ 28343888Sbrian if (chap->child.pid) { 28443888Sbrian int status; 28543888Sbrian 28643888Sbrian close(chap->child.fd); 28743888Sbrian chap->child.fd = -1; 28843888Sbrian if (sig) 28943888Sbrian kill(chap->child.pid, SIGTERM); 29043888Sbrian chap->child.pid = 0; 29143888Sbrian chap->child.buf.len = 0; 29243888Sbrian 29343888Sbrian if (wait(&status) == -1) 29443888Sbrian log_Printf(LogERROR, "Chap: wait: %s\n", strerror(errno)); 29543888Sbrian else if (WIFSIGNALED(status)) 29643888Sbrian log_Printf(LogWARN, "Chap: Child received signal %d\n", WTERMSIG(status)); 29743888Sbrian else if (WIFEXITED(status) && WEXITSTATUS(status)) 29843888Sbrian log_Printf(LogERROR, "Chap: Child exited %d\n", WEXITSTATUS(status)); 29943888Sbrian } 30045907Sbrian *chap->challenge.local = *chap->challenge.peer = '\0'; 30144123Sbrian#ifdef HAVE_DES 30244106Sbrian chap->peertries = 0; 30344123Sbrian#endif 30443888Sbrian} 30543888Sbrian 30643888Sbrianstatic void 30744123Sbrianchap_Respond(struct chap *chap, char *name, char *key, u_char type 30844123Sbrian#ifdef HAVE_DES 30944123Sbrian , int lm 31044123Sbrian#endif 31144123Sbrian ) 31243888Sbrian{ 31344106Sbrian u_char *ans; 31443888Sbrian 31545907Sbrian ans = chap_BuildAnswer(name, key, chap->auth.id, chap->challenge.peer, type 31644123Sbrian#ifdef HAVE_DES 31744123Sbrian , lm 31844123Sbrian#endif 31944123Sbrian ); 32043888Sbrian 32143888Sbrian if (ans) { 32243888Sbrian ChapOutput(chap->auth.physical, CHAP_RESPONSE, chap->auth.id, 32343888Sbrian ans, *ans + 1 + strlen(name), name); 32444123Sbrian#ifdef HAVE_DES 32544106Sbrian chap->NTRespSent = !lm; 32644123Sbrian#endif 32743888Sbrian free(ans); 32843888Sbrian } else 32943888Sbrian ChapOutput(chap->auth.physical, CHAP_FAILURE, chap->auth.id, 33043888Sbrian "Out of memory!", 14, NULL); 33143888Sbrian} 33243888Sbrian 33343888Sbrianstatic int 33458028Sbrianchap_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n) 33543888Sbrian{ 33643888Sbrian struct chap *chap = descriptor2chap(d); 33743888Sbrian 33843888Sbrian if (r && chap && chap->child.fd != -1) { 33943888Sbrian FD_SET(chap->child.fd, r); 34043888Sbrian if (*n < chap->child.fd + 1) 34143888Sbrian *n = chap->child.fd + 1; 34243888Sbrian log_Printf(LogTIMER, "Chap: fdset(r) %d\n", chap->child.fd); 34343888Sbrian return 1; 34443888Sbrian } 34543888Sbrian 34643888Sbrian return 0; 34743888Sbrian} 34843888Sbrian 34943888Sbrianstatic int 35058028Sbrianchap_IsSet(struct fdescriptor *d, const fd_set *fdset) 35143888Sbrian{ 35243888Sbrian struct chap *chap = descriptor2chap(d); 35343888Sbrian 35443888Sbrian return chap && chap->child.fd != -1 && FD_ISSET(chap->child.fd, fdset); 35543888Sbrian} 35643888Sbrian 35743888Sbrianstatic void 35858028Sbrianchap_Read(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset) 35943888Sbrian{ 36043888Sbrian struct chap *chap = descriptor2chap(d); 36143888Sbrian int got; 36243888Sbrian 36343888Sbrian got = read(chap->child.fd, chap->child.buf.ptr + chap->child.buf.len, 36443888Sbrian sizeof chap->child.buf.ptr - chap->child.buf.len - 1); 36543888Sbrian if (got == -1) { 36643888Sbrian log_Printf(LogERROR, "Chap: Read: %s\n", strerror(errno)); 36743888Sbrian chap_Cleanup(chap, SIGTERM); 36843888Sbrian } else if (got == 0) { 36943888Sbrian log_Printf(LogWARN, "Chap: Read: Child terminated connection\n"); 37043888Sbrian chap_Cleanup(chap, SIGTERM); 37143888Sbrian } else { 37243888Sbrian char *name, *key, *end; 37343888Sbrian 37443888Sbrian chap->child.buf.len += got; 37543888Sbrian chap->child.buf.ptr[chap->child.buf.len] = '\0'; 37643888Sbrian name = chap->child.buf.ptr; 37743888Sbrian name += strspn(name, " \t"); 37843888Sbrian if ((key = strchr(name, '\n')) == NULL) 37943888Sbrian end = NULL; 38043888Sbrian else 38143888Sbrian end = strchr(++key, '\n'); 38243888Sbrian 38343888Sbrian if (end == NULL) { 38443888Sbrian if (chap->child.buf.len == sizeof chap->child.buf.ptr - 1) { 38543888Sbrian log_Printf(LogWARN, "Chap: Read: Input buffer overflow\n"); 38643888Sbrian chap_Cleanup(chap, SIGTERM); 38743888Sbrian } 38843888Sbrian } else { 38944123Sbrian#ifdef HAVE_DES 39044106Sbrian int lanman = chap->auth.physical->link.lcp.his_authtype == 0x80 && 39144106Sbrian ((chap->NTRespSent && 39244106Sbrian IsAccepted(chap->auth.physical->link.lcp.cfg.chap80lm)) || 39344106Sbrian !IsAccepted(chap->auth.physical->link.lcp.cfg.chap80nt)); 39444123Sbrian#endif 39544106Sbrian 39643888Sbrian while (end >= name && strchr(" \t\r\n", *end)) 39743888Sbrian *end-- = '\0'; 39843888Sbrian end = key - 1; 39943888Sbrian while (end >= name && strchr(" \t\r\n", *end)) 40043888Sbrian *end-- = '\0'; 40143888Sbrian key += strspn(key, " \t"); 40243888Sbrian 40344123Sbrian chap_Respond(chap, name, key, chap->auth.physical->link.lcp.his_authtype 40444123Sbrian#ifdef HAVE_DES 40544123Sbrian , lanman 40644123Sbrian#endif 40744123Sbrian ); 40843888Sbrian chap_Cleanup(chap, 0); 40943888Sbrian } 41043888Sbrian } 41143888Sbrian} 41243888Sbrian 41343888Sbrianstatic int 41458028Sbrianchap_Write(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset) 41543888Sbrian{ 41643888Sbrian /* We never want to write here ! */ 41743888Sbrian log_Printf(LogALERT, "chap_Write: Internal error: Bad call !\n"); 41843888Sbrian return 0; 41943888Sbrian} 42043888Sbrian 42143888Sbrianstatic void 42243693Sbrianchap_Challenge(struct authinfo *authp) 42343693Sbrian{ 42443693Sbrian struct chap *chap = auth2chap(authp); 42513379Sphk int len, i; 4266059Samurai char *cp; 4276059Samurai 42843888Sbrian len = strlen(authp->physical->dl->bundle->cfg.auth.name); 42943401Sbrian 43045907Sbrian if (!*chap->challenge.local) { 43143888Sbrian randinit(); 43245907Sbrian cp = chap->challenge.local; 43343888Sbrian 43443313Sbrian#ifndef NORADIUS 43543888Sbrian if (*authp->physical->dl->bundle->radius.cfg.file) { 43643888Sbrian /* For radius, our challenge is 16 readable NUL terminated bytes :*/ 43743888Sbrian *cp++ = 16; 43843888Sbrian for (i = 0; i < 16; i++) 43943888Sbrian *cp++ = (random() % 10) + '0'; 44043888Sbrian } else 44143313Sbrian#endif 44243888Sbrian { 44344106Sbrian#ifdef HAVE_DES 44444106Sbrian if (authp->physical->link.lcp.want_authtype == 0x80) 44544106Sbrian *cp++ = 8; /* MS does 8 byte callenges :-/ */ 44644106Sbrian else 44744106Sbrian#endif 44844106Sbrian *cp++ = random() % (CHAPCHALLENGELEN-16) + 16; 44945907Sbrian for (i = 0; i < *chap->challenge.local; i++) 45043888Sbrian *cp++ = random() & 0xff; 45143888Sbrian } 45243888Sbrian memcpy(cp, authp->physical->dl->bundle->cfg.auth.name, len); 45343313Sbrian } 45445907Sbrian ChapOutput(authp->physical, CHAP_CHALLENGE, authp->id, chap->challenge.local, 45545907Sbrian 1 + *chap->challenge.local + len, NULL); 4566059Samurai} 4576059Samurai 45830715Sbrianstatic void 45943693Sbrianchap_Success(struct authinfo *authp) 4606059Samurai{ 46143693Sbrian datalink_GotAuthname(authp->physical->dl, authp->in.name); 46243693Sbrian ChapOutput(authp->physical, CHAP_SUCCESS, authp->id, "Welcome!!", 10, NULL); 46343693Sbrian authp->physical->link.lcp.auth_ineed = 0; 46443693Sbrian if (Enabled(authp->physical->dl->bundle, OPT_UTMP)) 46543693Sbrian physical_Login(authp->physical, authp->in.name); 4666059Samurai 46743693Sbrian if (authp->physical->link.lcp.auth_iwait == 0) 46843693Sbrian /* 46943693Sbrian * Either I didn't need to authenticate, or I've already been 47043693Sbrian * told that I got the answer right. 47143693Sbrian */ 47243693Sbrian datalink_AuthOk(authp->physical->dl); 47343693Sbrian} 4746059Samurai 47543693Sbrianstatic void 47643693Sbrianchap_Failure(struct authinfo *authp) 47743693Sbrian{ 47843693Sbrian ChapOutput(authp->physical, CHAP_FAILURE, authp->id, "Invalid!!", 9, NULL); 47943693Sbrian datalink_AuthNotOk(authp->physical->dl); 48043693Sbrian} 48137926Sbrian 48244106Sbrianstatic int 48344123Sbrianchap_Cmp(u_char type, char *myans, int mylen, char *hisans, int hislen 48444123Sbrian#ifdef HAVE_DES 48544123Sbrian , int lm 48644123Sbrian#endif 48744123Sbrian ) 48844106Sbrian{ 48944106Sbrian if (mylen != hislen) 49044106Sbrian return 0; 49144123Sbrian#ifdef HAVE_DES 49244106Sbrian else if (type == 0x80) { 49344106Sbrian int off = lm ? 0 : 24; 49444106Sbrian 49544106Sbrian if (memcmp(myans + off, hisans + off, 24)) 49644106Sbrian return 0; 49744123Sbrian } 49844123Sbrian#endif 49944123Sbrian else if (memcmp(myans, hisans, mylen)) 50044106Sbrian return 0; 50144106Sbrian 50244106Sbrian return 1; 50344106Sbrian} 50444106Sbrian 50544123Sbrian#ifdef HAVE_DES 50644106Sbrianstatic int 50744106Sbrianchap_HaveAnotherGo(struct chap *chap) 50844106Sbrian{ 50944106Sbrian if (++chap->peertries < 3) { 51044106Sbrian /* Give the peer another shot */ 51145907Sbrian *chap->challenge.local = '\0'; 51244106Sbrian chap_Challenge(&chap->auth); 51344106Sbrian return 1; 51444106Sbrian } 51544106Sbrian 51644106Sbrian return 0; 51744106Sbrian} 51844123Sbrian#endif 51944106Sbrian 52043693Sbrianvoid 52143693Sbrianchap_Init(struct chap *chap, struct physical *p) 52243693Sbrian{ 52343888Sbrian chap->desc.type = CHAP_DESCRIPTOR; 52443888Sbrian chap->desc.UpdateSet = chap_UpdateSet; 52543888Sbrian chap->desc.IsSet = chap_IsSet; 52643888Sbrian chap->desc.Read = chap_Read; 52743888Sbrian chap->desc.Write = chap_Write; 52843888Sbrian chap->child.pid = 0; 52943888Sbrian chap->child.fd = -1; 53043693Sbrian auth_Init(&chap->auth, p, chap_Challenge, chap_Success, chap_Failure); 53145907Sbrian *chap->challenge.local = *chap->challenge.peer = '\0'; 53244123Sbrian#ifdef HAVE_DES 53344106Sbrian chap->NTRespSent = 0; 53444106Sbrian chap->peertries = 0; 53544123Sbrian#endif 53643693Sbrian} 53729840Sbrian 53843693Sbrianvoid 53943888Sbrianchap_ReInit(struct chap *chap) 54043888Sbrian{ 54143888Sbrian chap_Cleanup(chap, SIGTERM); 54243888Sbrian} 54343888Sbrian 54446686Sbrianstruct mbuf * 54546686Sbrianchap_Input(struct bundle *bundle, struct link *l, struct mbuf *bp) 54643693Sbrian{ 54746686Sbrian struct physical *p = link2physical(l); 54843693Sbrian struct chap *chap = &p->dl->chap; 54944106Sbrian char *name, *key, *ans; 55044123Sbrian int len, nlen; 55148817Sbrian u_char alen; 55244123Sbrian#ifdef HAVE_DES 55344123Sbrian int lanman; 55444123Sbrian#endif 55529840Sbrian 55646686Sbrian if (p == NULL) { 55746686Sbrian log_Printf(LogERROR, "chap_Input: Not a physical link - dropped\n"); 55854912Sbrian m_freem(bp); 55946686Sbrian return NULL; 56046686Sbrian } 56146686Sbrian 56246686Sbrian if (bundle_Phase(bundle) != PHASE_NETWORK && 56346686Sbrian bundle_Phase(bundle) != PHASE_AUTHENTICATE) { 56445220Sbrian log_Printf(LogPHASE, "Unexpected chap input - dropped !\n"); 56554912Sbrian m_freem(bp); 56646686Sbrian return NULL; 56745220Sbrian } 56845220Sbrian 56954912Sbrian m_settype(bp, MB_CHAPIN); 57044159Sbrian if ((bp = auth_ReadHeader(&chap->auth, bp)) == NULL && 57144159Sbrian ntohs(chap->auth.in.hdr.length) == 0) 57244159Sbrian log_Printf(LogWARN, "Chap Input: Truncated header !\n"); 57343693Sbrian else if (chap->auth.in.hdr.code == 0 || chap->auth.in.hdr.code > MAXCHAPCODE) 57443693Sbrian log_Printf(LogPHASE, "Chap Input: %d: Bad CHAP code !\n", 57543693Sbrian chap->auth.in.hdr.code); 57643693Sbrian else { 57754912Sbrian len = m_length(bp); 57843693Sbrian ans = NULL; 57943693Sbrian 58043693Sbrian if (chap->auth.in.hdr.code != CHAP_CHALLENGE && 58143693Sbrian chap->auth.id != chap->auth.in.hdr.id && 58246686Sbrian Enabled(bundle, OPT_IDCHECK)) { 58343693Sbrian /* Wrong conversation dude ! */ 58443693Sbrian log_Printf(LogPHASE, "Chap Input: %s dropped (got id %d, not %d)\n", 58543693Sbrian chapcodes[chap->auth.in.hdr.code], chap->auth.in.hdr.id, 58643693Sbrian chap->auth.id); 58754912Sbrian m_freem(bp); 58846686Sbrian return NULL; 58925630Sbrian } 59043693Sbrian chap->auth.id = chap->auth.in.hdr.id; /* We respond with this id */ 59129840Sbrian 59244123Sbrian#ifdef HAVE_DES 59344106Sbrian lanman = 0; 59444123Sbrian#endif 59543693Sbrian switch (chap->auth.in.hdr.code) { 59643693Sbrian case CHAP_CHALLENGE: 59744106Sbrian bp = mbuf_Read(bp, &alen, 1); 59844106Sbrian len -= alen + 1; 59943693Sbrian if (len < 0) { 60043693Sbrian log_Printf(LogERROR, "Chap Input: Truncated challenge !\n"); 60154912Sbrian m_freem(bp); 60246686Sbrian return NULL; 60343693Sbrian } 60445907Sbrian *chap->challenge.peer = alen; 60545907Sbrian bp = mbuf_Read(bp, chap->challenge.peer + 1, alen); 60643693Sbrian bp = auth_ReadName(&chap->auth, bp, len); 60744123Sbrian#ifdef HAVE_DES 60844106Sbrian lanman = p->link.lcp.his_authtype == 0x80 && 60944106Sbrian ((chap->NTRespSent && IsAccepted(p->link.lcp.cfg.chap80lm)) || 61044106Sbrian !IsAccepted(p->link.lcp.cfg.chap80nt)); 61144123Sbrian#endif 61243693Sbrian break; 61343313Sbrian 61443693Sbrian case CHAP_RESPONSE: 61543693Sbrian auth_StopTimer(&chap->auth); 61643693Sbrian bp = mbuf_Read(bp, &alen, 1); 61743693Sbrian len -= alen + 1; 61843693Sbrian if (len < 0) { 61943693Sbrian log_Printf(LogERROR, "Chap Input: Truncated response !\n"); 62054912Sbrian m_freem(bp); 62146686Sbrian return NULL; 62243693Sbrian } 62343693Sbrian if ((ans = malloc(alen + 2)) == NULL) { 62443693Sbrian log_Printf(LogERROR, "Chap Input: Out of memory !\n"); 62554912Sbrian m_freem(bp); 62646686Sbrian return NULL; 62743693Sbrian } 62843693Sbrian *ans = chap->auth.id; 62943693Sbrian bp = mbuf_Read(bp, ans + 1, alen); 63043693Sbrian ans[alen+1] = '\0'; 63143693Sbrian bp = auth_ReadName(&chap->auth, bp, len); 63244123Sbrian#ifdef HAVE_DES 63344106Sbrian lanman = alen == 49 && ans[alen] == 0; 63444123Sbrian#endif 63543693Sbrian break; 63643313Sbrian 63743693Sbrian case CHAP_SUCCESS: 63843693Sbrian case CHAP_FAILURE: 63943693Sbrian /* chap->auth.in.name is already set up at CHALLENGE time */ 64043693Sbrian if ((ans = malloc(len + 1)) == NULL) { 64143693Sbrian log_Printf(LogERROR, "Chap Input: Out of memory !\n"); 64254912Sbrian m_freem(bp); 64346686Sbrian return NULL; 64443693Sbrian } 64543693Sbrian bp = mbuf_Read(bp, ans, len); 64643693Sbrian ans[len] = '\0'; 64743693Sbrian break; 64843401Sbrian } 64936285Sbrian 65043693Sbrian switch (chap->auth.in.hdr.code) { 65143693Sbrian case CHAP_CHALLENGE: 65243693Sbrian case CHAP_RESPONSE: 65343693Sbrian if (*chap->auth.in.name) 65444106Sbrian log_Printf(LogPHASE, "Chap Input: %s (%d bytes from %s%s)\n", 65544106Sbrian chapcodes[chap->auth.in.hdr.code], alen, 65644106Sbrian chap->auth.in.name, 65744123Sbrian#ifdef HAVE_DES 65844106Sbrian lanman && chap->auth.in.hdr.code == CHAP_RESPONSE ? 65944123Sbrian " - lanman" : 66044123Sbrian#endif 66144123Sbrian ""); 66243693Sbrian else 66344106Sbrian log_Printf(LogPHASE, "Chap Input: %s (%d bytes%s)\n", 66444106Sbrian chapcodes[chap->auth.in.hdr.code], alen, 66544123Sbrian#ifdef HAVE_DES 66644106Sbrian lanman && chap->auth.in.hdr.code == CHAP_RESPONSE ? 66744123Sbrian " - lanman" : 66844123Sbrian#endif 66944123Sbrian ""); 67043693Sbrian break; 67136285Sbrian 67243693Sbrian case CHAP_SUCCESS: 67343693Sbrian case CHAP_FAILURE: 67443693Sbrian if (*ans) 67543693Sbrian log_Printf(LogPHASE, "Chap Input: %s (%s)\n", 67643693Sbrian chapcodes[chap->auth.in.hdr.code], ans); 67743693Sbrian else 67843693Sbrian log_Printf(LogPHASE, "Chap Input: %s\n", 67943693Sbrian chapcodes[chap->auth.in.hdr.code]); 68043693Sbrian break; 6816059Samurai } 6826059Samurai 68343693Sbrian switch (chap->auth.in.hdr.code) { 68443693Sbrian case CHAP_CHALLENGE: 68546686Sbrian if (*bundle->cfg.auth.key == '!') 68646686Sbrian chap_StartChild(chap, bundle->cfg.auth.key + 1, 68746686Sbrian bundle->cfg.auth.name); 68843888Sbrian else 68946686Sbrian chap_Respond(chap, bundle->cfg.auth.name, 69046686Sbrian bundle->cfg.auth.key, p->link.lcp.his_authtype 69144123Sbrian#ifdef HAVE_DES 69244123Sbrian , lanman 69344123Sbrian#endif 69444123Sbrian ); 69543693Sbrian break; 6966059Samurai 69743693Sbrian case CHAP_RESPONSE: 69843693Sbrian name = chap->auth.in.name; 69943693Sbrian nlen = strlen(name); 70043693Sbrian#ifndef NORADIUS 70146686Sbrian if (*bundle->radius.cfg.file) { 70248817Sbrian u_char end; 70348817Sbrian 70445907Sbrian end = chap->challenge.local[*chap->challenge.local+1]; 70545907Sbrian chap->challenge.local[*chap->challenge.local+1] = '\0'; 70646686Sbrian radius_Authenticate(&bundle->radius, &chap->auth, 70745907Sbrian chap->auth.in.name, ans, 70845907Sbrian chap->challenge.local + 1); 70945907Sbrian chap->challenge.local[*chap->challenge.local+1] = end; 71043693Sbrian } else 71143693Sbrian#endif 71243693Sbrian { 71346686Sbrian key = auth_GetSecret(bundle, name, nlen, p); 71443693Sbrian if (key) { 71544106Sbrian char *myans; 71644123Sbrian#ifdef HAVE_DES 71744106Sbrian if (lanman && !IsEnabled(p->link.lcp.cfg.chap80lm)) { 71844106Sbrian log_Printf(LogPHASE, "Auth failure: LANMan not enabled\n"); 71944106Sbrian if (chap_HaveAnotherGo(chap)) 72044106Sbrian break; 72143693Sbrian key = NULL; 72244122Sbrian } else if (!lanman && !IsEnabled(p->link.lcp.cfg.chap80nt) && 72344122Sbrian p->link.lcp.want_authtype == 0x80) { 72444106Sbrian log_Printf(LogPHASE, "Auth failure: mschap not enabled\n"); 72544106Sbrian if (chap_HaveAnotherGo(chap)) 72644106Sbrian break; 72744106Sbrian key = NULL; 72844123Sbrian } else 72944123Sbrian#endif 73044123Sbrian { 73144106Sbrian myans = chap_BuildAnswer(name, key, chap->auth.id, 73245907Sbrian chap->challenge.local, 73344123Sbrian p->link.lcp.want_authtype 73444123Sbrian#ifdef HAVE_DES 73544123Sbrian , lanman 73644123Sbrian#endif 73744123Sbrian ); 73844106Sbrian if (myans == NULL) 73943693Sbrian key = NULL; 74044106Sbrian else { 74144123Sbrian if (!chap_Cmp(p->link.lcp.want_authtype, myans + 1, *myans, 74244123Sbrian ans + 1, alen 74344123Sbrian#ifdef HAVE_DES 74444123Sbrian , lanman 74544123Sbrian#endif 74644123Sbrian )) 74744106Sbrian key = NULL; 74844106Sbrian free(myans); 74944106Sbrian } 75043693Sbrian } 75143693Sbrian } 7526059Samurai 75343693Sbrian if (key) 75443693Sbrian chap_Success(&chap->auth); 75543693Sbrian else 75643693Sbrian chap_Failure(&chap->auth); 75743693Sbrian } 7586059Samurai 75943693Sbrian break; 7606059Samurai 7616059Samurai case CHAP_SUCCESS: 76243693Sbrian if (p->link.lcp.auth_iwait == PROTO_CHAP) { 76343693Sbrian p->link.lcp.auth_iwait = 0; 76443693Sbrian if (p->link.lcp.auth_ineed == 0) 76543693Sbrian /* 76643693Sbrian * We've succeeded in our ``login'' 76743693Sbrian * If we're not expecting the peer to authenticate (or he already 76843693Sbrian * has), proceed to network phase. 76943693Sbrian */ 77043693Sbrian datalink_AuthOk(p->dl); 77143693Sbrian } 77243693Sbrian break; 77343693Sbrian 7746059Samurai case CHAP_FAILURE: 77543693Sbrian datalink_AuthNotOk(p->dl); 77643693Sbrian break; 7776059Samurai } 77843693Sbrian free(ans); 7796059Samurai } 78043693Sbrian 78154912Sbrian m_freem(bp); 78246686Sbrian return NULL; 7836059Samurai} 784