chap.c revision 55252
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 55252 1999-12-30 03:36:11Z 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" 526059Samurai#include "lcp.h" 5336285Sbrian#include "lqr.h" 546059Samurai#include "hdlc.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 796059Samurai 8055146Sbrianstatic const char * const chapcodes[] = { 8119866Sphk "???", "CHALLENGE", "RESPONSE", "SUCCESS", "FAILURE" 826059Samurai}; 8343693Sbrian#define MAXCHAPCODE (sizeof chapcodes / sizeof chapcodes[0] - 1) 846059Samurai 8530715Sbrianstatic void 8636285SbrianChapOutput(struct physical *physical, u_int code, u_int id, 8743693Sbrian const u_char *ptr, int count, const char *text) 886059Samurai{ 896059Samurai int plen; 906059Samurai struct fsmheader lh; 916059Samurai struct mbuf *bp; 926059Samurai 9328679Sbrian plen = sizeof(struct fsmheader) + count; 946059Samurai lh.code = code; 956059Samurai lh.id = id; 966059Samurai lh.length = htons(plen); 9754912Sbrian bp = m_get(plen, MB_CHAPOUT); 9830715Sbrian memcpy(MBUF_CTOP(bp), &lh, sizeof(struct fsmheader)); 996059Samurai if (count) 10030715Sbrian memcpy(MBUF_CTOP(bp) + sizeof(struct fsmheader), ptr, count); 10136285Sbrian log_DumpBp(LogDEBUG, "ChapOutput", bp); 10237926Sbrian if (text == NULL) 10337926Sbrian log_Printf(LogPHASE, "Chap Output: %s\n", chapcodes[code]); 10437926Sbrian else 10537926Sbrian log_Printf(LogPHASE, "Chap Output: %s (%s)\n", chapcodes[code], text); 10646686Sbrian link_PushPacket(&physical->link, bp, physical->dl->bundle, 10750867Sbrian LINK_QUEUES(&physical->link) - 1, PROTO_CHAP); 1086059Samurai} 1096059Samurai 11043693Sbrianstatic char * 11144123Sbrianchap_BuildAnswer(char *name, char *key, u_char id, char *challenge, u_char type 11244123Sbrian#ifdef HAVE_DES 11344123Sbrian , int lanman 11444123Sbrian#endif 11544123Sbrian ) 1166059Samurai{ 11743693Sbrian char *result, *digest; 11843693Sbrian size_t nlen, klen; 11943693Sbrian 12043693Sbrian nlen = strlen(name); 12143693Sbrian klen = strlen(key); 12243693Sbrian 12343693Sbrian#ifdef HAVE_DES 12444106Sbrian if (type == 0x80) { 12543693Sbrian char expkey[AUTHLEN << 2]; 12643693Sbrian MD4_CTX MD4context; 12743693Sbrian int f; 12843693Sbrian 12943693Sbrian if ((result = malloc(1 + nlen + MS_CHAP_RESPONSE_LEN)) == NULL) 13043693Sbrian return result; 13143693Sbrian 13244106Sbrian digest = result; /* the response */ 13344106Sbrian *digest++ = MS_CHAP_RESPONSE_LEN; /* 49 */ 13444106Sbrian memcpy(digest + MS_CHAP_RESPONSE_LEN, name, nlen); 13544106Sbrian if (lanman) { 13644106Sbrian memset(digest + 24, '\0', 25); 13744106Sbrian mschap_LANMan(digest, challenge + 1, key); /* LANMan response */ 13844106Sbrian } else { 13944106Sbrian memset(digest, '\0', 25); 14044106Sbrian digest += 24; 14143693Sbrian 14244106Sbrian for (f = 0; f < klen; f++) { 14344106Sbrian expkey[2*f] = key[f]; 14444106Sbrian expkey[2*f+1] = '\0'; 14544106Sbrian } 14644106Sbrian /* 14744106Sbrian * ----------- 14844106Sbrian * expkey = | k\0e\0y\0 | 14944106Sbrian * ----------- 15044106Sbrian */ 15144106Sbrian MD4Init(&MD4context); 15244106Sbrian MD4Update(&MD4context, expkey, klen << 1); 15344106Sbrian MD4Final(digest, &MD4context); 15444106Sbrian 15544106Sbrian /* 15644106Sbrian * ---- -------- ---------------- ------- ------ 15744106Sbrian * result = | 49 | LANMan | 16 byte digest | 9 * ? | name | 15844106Sbrian * ---- -------- ---------------- ------- ------ 15944106Sbrian */ 16044106Sbrian mschap_NT(digest, challenge + 1); 16143693Sbrian } 16243693Sbrian /* 16344106Sbrian * ---- -------- ------------- ----- ------ 16444106Sbrian * | | struct MS_ChapResponse24 | | 16544106Sbrian * result = | 49 | LANMan | NT digest | 0/1 | name | 16644106Sbrian * ---- -------- ------------- ----- ------ 16744106Sbrian * where only one of LANMan & NT digest are set. 16843693Sbrian */ 16943693Sbrian } else 17043693Sbrian#endif 17143693Sbrian if ((result = malloc(nlen + 17)) != NULL) { 17243693Sbrian /* Normal MD5 stuff */ 17343693Sbrian MD5_CTX MD5context; 17443693Sbrian 17543693Sbrian digest = result; 17643693Sbrian *digest++ = 16; /* value size */ 17743693Sbrian 17843693Sbrian MD5Init(&MD5context); 17943693Sbrian MD5Update(&MD5context, &id, 1); 18043693Sbrian MD5Update(&MD5context, key, klen); 18143693Sbrian MD5Update(&MD5context, challenge + 1, *challenge); 18243693Sbrian MD5Final(digest, &MD5context); 18343693Sbrian 18443693Sbrian memcpy(digest + 16, name, nlen); 18543693Sbrian /* 18643693Sbrian * ---- -------- ------ 18743693Sbrian * result = | 16 | digest | name | 18843693Sbrian * ---- -------- ------ 18943693Sbrian */ 19043693Sbrian } 19143693Sbrian 19243693Sbrian return result; 19343693Sbrian} 19443693Sbrian 19543693Sbrianstatic void 19643888Sbrianchap_StartChild(struct chap *chap, char *prog, const char *name) 19743888Sbrian{ 19843888Sbrian char *argv[MAXARGS], *nargv[MAXARGS]; 19943888Sbrian int argc, fd; 20043888Sbrian int in[2], out[2]; 20147849Sbrian pid_t pid; 20243888Sbrian 20343888Sbrian if (chap->child.fd != -1) { 20443888Sbrian log_Printf(LogWARN, "Chap: %s: Program already running\n", prog); 20543888Sbrian return; 20643888Sbrian } 20743888Sbrian 20843888Sbrian if (pipe(in) == -1) { 20943888Sbrian log_Printf(LogERROR, "Chap: pipe: %s\n", strerror(errno)); 21043888Sbrian return; 21143888Sbrian } 21243888Sbrian 21343888Sbrian if (pipe(out) == -1) { 21443888Sbrian log_Printf(LogERROR, "Chap: pipe: %s\n", strerror(errno)); 21543888Sbrian close(in[0]); 21643888Sbrian close(in[1]); 21743888Sbrian return; 21843888Sbrian } 21943888Sbrian 22047849Sbrian pid = getpid(); 22143888Sbrian switch ((chap->child.pid = fork())) { 22243888Sbrian case -1: 22343888Sbrian log_Printf(LogERROR, "Chap: fork: %s\n", strerror(errno)); 22443888Sbrian close(in[0]); 22543888Sbrian close(in[1]); 22643888Sbrian close(out[0]); 22743888Sbrian close(out[1]); 22843888Sbrian chap->child.pid = 0; 22943888Sbrian return; 23043888Sbrian 23143888Sbrian case 0: 23243888Sbrian timer_TermService(); 23354914Sbrian 23454914Sbrian if ((argc = command_Interpret(prog, strlen(prog), argv)) <= 0) { 23554914Sbrian if (argc < 0) { 23654914Sbrian log_Printf(LogWARN, "CHAP: Invalid command syntax\n"); 23754914Sbrian _exit(255); 23854914Sbrian } 23954914Sbrian _exit(0); 24054914Sbrian } 24154914Sbrian 24243888Sbrian close(in[1]); 24343888Sbrian close(out[0]); 24449976Sbrian if (out[1] == STDIN_FILENO) 24549976Sbrian out[1] = dup(out[1]); 24643888Sbrian dup2(in[0], STDIN_FILENO); 24743888Sbrian dup2(out[1], STDOUT_FILENO); 24849976Sbrian close(STDERR_FILENO); 24949976Sbrian if (open(_PATH_DEVNULL, O_RDWR) != STDERR_FILENO) { 25043888Sbrian log_Printf(LogALERT, "Chap: Failed to open %s: %s\n", 25143888Sbrian _PATH_DEVNULL, strerror(errno)); 25243888Sbrian exit(1); 25343888Sbrian } 25449976Sbrian for (fd = getdtablesize(); fd > STDERR_FILENO; fd--) 25549976Sbrian fcntl(fd, F_SETFD, 1); 25655252Sbrian setuid(ID0realuid()); 25743888Sbrian command_Expand(nargv, argc, (char const *const *)argv, 25847849Sbrian chap->auth.physical->dl->bundle, 0, pid); 25943888Sbrian execvp(nargv[0], nargv); 26049976Sbrian printf("exec() of %s failed: %s\n", nargv[0], strerror(errno)); 26149976Sbrian _exit(255); 26243888Sbrian 26343888Sbrian default: 26443888Sbrian close(in[0]); 26543888Sbrian close(out[1]); 26643888Sbrian chap->child.fd = out[0]; 26743888Sbrian chap->child.buf.len = 0; 26843888Sbrian write(in[1], chap->auth.in.name, strlen(chap->auth.in.name)); 26943888Sbrian write(in[1], "\n", 1); 27045907Sbrian write(in[1], chap->challenge.peer + 1, *chap->challenge.peer); 27143888Sbrian write(in[1], "\n", 1); 27243888Sbrian write(in[1], name, strlen(name)); 27343888Sbrian write(in[1], "\n", 1); 27443888Sbrian close(in[1]); 27543888Sbrian break; 27643888Sbrian } 27743888Sbrian} 27843888Sbrian 27943888Sbrianstatic void 28043888Sbrianchap_Cleanup(struct chap *chap, int sig) 28143888Sbrian{ 28243888Sbrian if (chap->child.pid) { 28343888Sbrian int status; 28443888Sbrian 28543888Sbrian close(chap->child.fd); 28643888Sbrian chap->child.fd = -1; 28743888Sbrian if (sig) 28843888Sbrian kill(chap->child.pid, SIGTERM); 28943888Sbrian chap->child.pid = 0; 29043888Sbrian chap->child.buf.len = 0; 29143888Sbrian 29243888Sbrian if (wait(&status) == -1) 29343888Sbrian log_Printf(LogERROR, "Chap: wait: %s\n", strerror(errno)); 29443888Sbrian else if (WIFSIGNALED(status)) 29543888Sbrian log_Printf(LogWARN, "Chap: Child received signal %d\n", WTERMSIG(status)); 29643888Sbrian else if (WIFEXITED(status) && WEXITSTATUS(status)) 29743888Sbrian log_Printf(LogERROR, "Chap: Child exited %d\n", WEXITSTATUS(status)); 29843888Sbrian } 29945907Sbrian *chap->challenge.local = *chap->challenge.peer = '\0'; 30044123Sbrian#ifdef HAVE_DES 30144106Sbrian chap->peertries = 0; 30244123Sbrian#endif 30343888Sbrian} 30443888Sbrian 30543888Sbrianstatic void 30644123Sbrianchap_Respond(struct chap *chap, char *name, char *key, u_char type 30744123Sbrian#ifdef HAVE_DES 30844123Sbrian , int lm 30944123Sbrian#endif 31044123Sbrian ) 31143888Sbrian{ 31244106Sbrian u_char *ans; 31343888Sbrian 31445907Sbrian ans = chap_BuildAnswer(name, key, chap->auth.id, chap->challenge.peer, type 31544123Sbrian#ifdef HAVE_DES 31644123Sbrian , lm 31744123Sbrian#endif 31844123Sbrian ); 31943888Sbrian 32043888Sbrian if (ans) { 32143888Sbrian ChapOutput(chap->auth.physical, CHAP_RESPONSE, chap->auth.id, 32243888Sbrian ans, *ans + 1 + strlen(name), name); 32344123Sbrian#ifdef HAVE_DES 32444106Sbrian chap->NTRespSent = !lm; 32544123Sbrian#endif 32643888Sbrian free(ans); 32743888Sbrian } else 32843888Sbrian ChapOutput(chap->auth.physical, CHAP_FAILURE, chap->auth.id, 32943888Sbrian "Out of memory!", 14, NULL); 33043888Sbrian} 33143888Sbrian 33243888Sbrianstatic int 33343888Sbrianchap_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n) 33443888Sbrian{ 33543888Sbrian struct chap *chap = descriptor2chap(d); 33643888Sbrian 33743888Sbrian if (r && chap && chap->child.fd != -1) { 33843888Sbrian FD_SET(chap->child.fd, r); 33943888Sbrian if (*n < chap->child.fd + 1) 34043888Sbrian *n = chap->child.fd + 1; 34143888Sbrian log_Printf(LogTIMER, "Chap: fdset(r) %d\n", chap->child.fd); 34243888Sbrian return 1; 34343888Sbrian } 34443888Sbrian 34543888Sbrian return 0; 34643888Sbrian} 34743888Sbrian 34843888Sbrianstatic int 34943888Sbrianchap_IsSet(struct descriptor *d, const fd_set *fdset) 35043888Sbrian{ 35143888Sbrian struct chap *chap = descriptor2chap(d); 35243888Sbrian 35343888Sbrian return chap && chap->child.fd != -1 && FD_ISSET(chap->child.fd, fdset); 35443888Sbrian} 35543888Sbrian 35643888Sbrianstatic void 35743888Sbrianchap_Read(struct descriptor *d, struct bundle *bundle, const fd_set *fdset) 35843888Sbrian{ 35943888Sbrian struct chap *chap = descriptor2chap(d); 36043888Sbrian int got; 36143888Sbrian 36243888Sbrian got = read(chap->child.fd, chap->child.buf.ptr + chap->child.buf.len, 36343888Sbrian sizeof chap->child.buf.ptr - chap->child.buf.len - 1); 36443888Sbrian if (got == -1) { 36543888Sbrian log_Printf(LogERROR, "Chap: Read: %s\n", strerror(errno)); 36643888Sbrian chap_Cleanup(chap, SIGTERM); 36743888Sbrian } else if (got == 0) { 36843888Sbrian log_Printf(LogWARN, "Chap: Read: Child terminated connection\n"); 36943888Sbrian chap_Cleanup(chap, SIGTERM); 37043888Sbrian } else { 37143888Sbrian char *name, *key, *end; 37243888Sbrian 37343888Sbrian chap->child.buf.len += got; 37443888Sbrian chap->child.buf.ptr[chap->child.buf.len] = '\0'; 37543888Sbrian name = chap->child.buf.ptr; 37643888Sbrian name += strspn(name, " \t"); 37743888Sbrian if ((key = strchr(name, '\n')) == NULL) 37843888Sbrian end = NULL; 37943888Sbrian else 38043888Sbrian end = strchr(++key, '\n'); 38143888Sbrian 38243888Sbrian if (end == NULL) { 38343888Sbrian if (chap->child.buf.len == sizeof chap->child.buf.ptr - 1) { 38443888Sbrian log_Printf(LogWARN, "Chap: Read: Input buffer overflow\n"); 38543888Sbrian chap_Cleanup(chap, SIGTERM); 38643888Sbrian } 38743888Sbrian } else { 38844123Sbrian#ifdef HAVE_DES 38944106Sbrian int lanman = chap->auth.physical->link.lcp.his_authtype == 0x80 && 39044106Sbrian ((chap->NTRespSent && 39144106Sbrian IsAccepted(chap->auth.physical->link.lcp.cfg.chap80lm)) || 39244106Sbrian !IsAccepted(chap->auth.physical->link.lcp.cfg.chap80nt)); 39344123Sbrian#endif 39444106Sbrian 39543888Sbrian while (end >= name && strchr(" \t\r\n", *end)) 39643888Sbrian *end-- = '\0'; 39743888Sbrian end = key - 1; 39843888Sbrian while (end >= name && strchr(" \t\r\n", *end)) 39943888Sbrian *end-- = '\0'; 40043888Sbrian key += strspn(key, " \t"); 40143888Sbrian 40244123Sbrian chap_Respond(chap, name, key, chap->auth.physical->link.lcp.his_authtype 40344123Sbrian#ifdef HAVE_DES 40444123Sbrian , lanman 40544123Sbrian#endif 40644123Sbrian ); 40743888Sbrian chap_Cleanup(chap, 0); 40843888Sbrian } 40943888Sbrian } 41043888Sbrian} 41143888Sbrian 41243888Sbrianstatic int 41343888Sbrianchap_Write(struct descriptor *d, struct bundle *bundle, const fd_set *fdset) 41443888Sbrian{ 41543888Sbrian /* We never want to write here ! */ 41643888Sbrian log_Printf(LogALERT, "chap_Write: Internal error: Bad call !\n"); 41743888Sbrian return 0; 41843888Sbrian} 41943888Sbrian 42043888Sbrianstatic void 42143693Sbrianchap_Challenge(struct authinfo *authp) 42243693Sbrian{ 42343693Sbrian struct chap *chap = auth2chap(authp); 42413379Sphk int len, i; 4256059Samurai char *cp; 4266059Samurai 42743888Sbrian len = strlen(authp->physical->dl->bundle->cfg.auth.name); 42843401Sbrian 42945907Sbrian if (!*chap->challenge.local) { 43043888Sbrian randinit(); 43145907Sbrian cp = chap->challenge.local; 43243888Sbrian 43343313Sbrian#ifndef NORADIUS 43443888Sbrian if (*authp->physical->dl->bundle->radius.cfg.file) { 43543888Sbrian /* For radius, our challenge is 16 readable NUL terminated bytes :*/ 43643888Sbrian *cp++ = 16; 43743888Sbrian for (i = 0; i < 16; i++) 43843888Sbrian *cp++ = (random() % 10) + '0'; 43943888Sbrian } else 44043313Sbrian#endif 44143888Sbrian { 44244106Sbrian#ifdef HAVE_DES 44344106Sbrian if (authp->physical->link.lcp.want_authtype == 0x80) 44444106Sbrian *cp++ = 8; /* MS does 8 byte callenges :-/ */ 44544106Sbrian else 44644106Sbrian#endif 44744106Sbrian *cp++ = random() % (CHAPCHALLENGELEN-16) + 16; 44845907Sbrian for (i = 0; i < *chap->challenge.local; i++) 44943888Sbrian *cp++ = random() & 0xff; 45043888Sbrian } 45143888Sbrian memcpy(cp, authp->physical->dl->bundle->cfg.auth.name, len); 45243313Sbrian } 45345907Sbrian ChapOutput(authp->physical, CHAP_CHALLENGE, authp->id, chap->challenge.local, 45445907Sbrian 1 + *chap->challenge.local + len, NULL); 4556059Samurai} 4566059Samurai 45730715Sbrianstatic void 45843693Sbrianchap_Success(struct authinfo *authp) 4596059Samurai{ 46043693Sbrian datalink_GotAuthname(authp->physical->dl, authp->in.name); 46143693Sbrian ChapOutput(authp->physical, CHAP_SUCCESS, authp->id, "Welcome!!", 10, NULL); 46243693Sbrian authp->physical->link.lcp.auth_ineed = 0; 46343693Sbrian if (Enabled(authp->physical->dl->bundle, OPT_UTMP)) 46443693Sbrian physical_Login(authp->physical, authp->in.name); 4656059Samurai 46643693Sbrian if (authp->physical->link.lcp.auth_iwait == 0) 46743693Sbrian /* 46843693Sbrian * Either I didn't need to authenticate, or I've already been 46943693Sbrian * told that I got the answer right. 47043693Sbrian */ 47143693Sbrian datalink_AuthOk(authp->physical->dl); 47243693Sbrian} 4736059Samurai 47443693Sbrianstatic void 47543693Sbrianchap_Failure(struct authinfo *authp) 47643693Sbrian{ 47743693Sbrian ChapOutput(authp->physical, CHAP_FAILURE, authp->id, "Invalid!!", 9, NULL); 47843693Sbrian datalink_AuthNotOk(authp->physical->dl); 47943693Sbrian} 48037926Sbrian 48144106Sbrianstatic int 48244123Sbrianchap_Cmp(u_char type, char *myans, int mylen, char *hisans, int hislen 48344123Sbrian#ifdef HAVE_DES 48444123Sbrian , int lm 48544123Sbrian#endif 48644123Sbrian ) 48744106Sbrian{ 48844106Sbrian if (mylen != hislen) 48944106Sbrian return 0; 49044123Sbrian#ifdef HAVE_DES 49144106Sbrian else if (type == 0x80) { 49244106Sbrian int off = lm ? 0 : 24; 49344106Sbrian 49444106Sbrian if (memcmp(myans + off, hisans + off, 24)) 49544106Sbrian return 0; 49644123Sbrian } 49744123Sbrian#endif 49844123Sbrian else if (memcmp(myans, hisans, mylen)) 49944106Sbrian return 0; 50044106Sbrian 50144106Sbrian return 1; 50244106Sbrian} 50344106Sbrian 50444123Sbrian#ifdef HAVE_DES 50544106Sbrianstatic int 50644106Sbrianchap_HaveAnotherGo(struct chap *chap) 50744106Sbrian{ 50844106Sbrian if (++chap->peertries < 3) { 50944106Sbrian /* Give the peer another shot */ 51045907Sbrian *chap->challenge.local = '\0'; 51144106Sbrian chap_Challenge(&chap->auth); 51244106Sbrian return 1; 51344106Sbrian } 51444106Sbrian 51544106Sbrian return 0; 51644106Sbrian} 51744123Sbrian#endif 51844106Sbrian 51943693Sbrianvoid 52043693Sbrianchap_Init(struct chap *chap, struct physical *p) 52143693Sbrian{ 52243888Sbrian chap->desc.type = CHAP_DESCRIPTOR; 52343888Sbrian chap->desc.UpdateSet = chap_UpdateSet; 52443888Sbrian chap->desc.IsSet = chap_IsSet; 52543888Sbrian chap->desc.Read = chap_Read; 52643888Sbrian chap->desc.Write = chap_Write; 52743888Sbrian chap->child.pid = 0; 52843888Sbrian chap->child.fd = -1; 52943693Sbrian auth_Init(&chap->auth, p, chap_Challenge, chap_Success, chap_Failure); 53045907Sbrian *chap->challenge.local = *chap->challenge.peer = '\0'; 53144123Sbrian#ifdef HAVE_DES 53244106Sbrian chap->NTRespSent = 0; 53344106Sbrian chap->peertries = 0; 53444123Sbrian#endif 53543693Sbrian} 53629840Sbrian 53743693Sbrianvoid 53843888Sbrianchap_ReInit(struct chap *chap) 53943888Sbrian{ 54043888Sbrian chap_Cleanup(chap, SIGTERM); 54143888Sbrian} 54243888Sbrian 54346686Sbrianstruct mbuf * 54446686Sbrianchap_Input(struct bundle *bundle, struct link *l, struct mbuf *bp) 54543693Sbrian{ 54646686Sbrian struct physical *p = link2physical(l); 54743693Sbrian struct chap *chap = &p->dl->chap; 54844106Sbrian char *name, *key, *ans; 54944123Sbrian int len, nlen; 55048817Sbrian u_char alen; 55144123Sbrian#ifdef HAVE_DES 55244123Sbrian int lanman; 55344123Sbrian#endif 55429840Sbrian 55546686Sbrian if (p == NULL) { 55646686Sbrian log_Printf(LogERROR, "chap_Input: Not a physical link - dropped\n"); 55754912Sbrian m_freem(bp); 55846686Sbrian return NULL; 55946686Sbrian } 56046686Sbrian 56146686Sbrian if (bundle_Phase(bundle) != PHASE_NETWORK && 56246686Sbrian bundle_Phase(bundle) != PHASE_AUTHENTICATE) { 56345220Sbrian log_Printf(LogPHASE, "Unexpected chap input - dropped !\n"); 56454912Sbrian m_freem(bp); 56546686Sbrian return NULL; 56645220Sbrian } 56745220Sbrian 56854912Sbrian m_settype(bp, MB_CHAPIN); 56944159Sbrian if ((bp = auth_ReadHeader(&chap->auth, bp)) == NULL && 57044159Sbrian ntohs(chap->auth.in.hdr.length) == 0) 57144159Sbrian log_Printf(LogWARN, "Chap Input: Truncated header !\n"); 57243693Sbrian else if (chap->auth.in.hdr.code == 0 || chap->auth.in.hdr.code > MAXCHAPCODE) 57343693Sbrian log_Printf(LogPHASE, "Chap Input: %d: Bad CHAP code !\n", 57443693Sbrian chap->auth.in.hdr.code); 57543693Sbrian else { 57654912Sbrian len = m_length(bp); 57743693Sbrian ans = NULL; 57843693Sbrian 57943693Sbrian if (chap->auth.in.hdr.code != CHAP_CHALLENGE && 58043693Sbrian chap->auth.id != chap->auth.in.hdr.id && 58146686Sbrian Enabled(bundle, OPT_IDCHECK)) { 58243693Sbrian /* Wrong conversation dude ! */ 58343693Sbrian log_Printf(LogPHASE, "Chap Input: %s dropped (got id %d, not %d)\n", 58443693Sbrian chapcodes[chap->auth.in.hdr.code], chap->auth.in.hdr.id, 58543693Sbrian chap->auth.id); 58654912Sbrian m_freem(bp); 58746686Sbrian return NULL; 58825630Sbrian } 58943693Sbrian chap->auth.id = chap->auth.in.hdr.id; /* We respond with this id */ 59029840Sbrian 59144123Sbrian#ifdef HAVE_DES 59244106Sbrian lanman = 0; 59344123Sbrian#endif 59443693Sbrian switch (chap->auth.in.hdr.code) { 59543693Sbrian case CHAP_CHALLENGE: 59644106Sbrian bp = mbuf_Read(bp, &alen, 1); 59744106Sbrian len -= alen + 1; 59843693Sbrian if (len < 0) { 59943693Sbrian log_Printf(LogERROR, "Chap Input: Truncated challenge !\n"); 60054912Sbrian m_freem(bp); 60146686Sbrian return NULL; 60243693Sbrian } 60345907Sbrian *chap->challenge.peer = alen; 60445907Sbrian bp = mbuf_Read(bp, chap->challenge.peer + 1, alen); 60543693Sbrian bp = auth_ReadName(&chap->auth, bp, len); 60644123Sbrian#ifdef HAVE_DES 60744106Sbrian lanman = p->link.lcp.his_authtype == 0x80 && 60844106Sbrian ((chap->NTRespSent && IsAccepted(p->link.lcp.cfg.chap80lm)) || 60944106Sbrian !IsAccepted(p->link.lcp.cfg.chap80nt)); 61044123Sbrian#endif 61143693Sbrian break; 61243313Sbrian 61343693Sbrian case CHAP_RESPONSE: 61443693Sbrian auth_StopTimer(&chap->auth); 61543693Sbrian bp = mbuf_Read(bp, &alen, 1); 61643693Sbrian len -= alen + 1; 61743693Sbrian if (len < 0) { 61843693Sbrian log_Printf(LogERROR, "Chap Input: Truncated response !\n"); 61954912Sbrian m_freem(bp); 62046686Sbrian return NULL; 62143693Sbrian } 62243693Sbrian if ((ans = malloc(alen + 2)) == NULL) { 62343693Sbrian log_Printf(LogERROR, "Chap Input: Out of memory !\n"); 62454912Sbrian m_freem(bp); 62546686Sbrian return NULL; 62643693Sbrian } 62743693Sbrian *ans = chap->auth.id; 62843693Sbrian bp = mbuf_Read(bp, ans + 1, alen); 62943693Sbrian ans[alen+1] = '\0'; 63043693Sbrian bp = auth_ReadName(&chap->auth, bp, len); 63144123Sbrian#ifdef HAVE_DES 63244106Sbrian lanman = alen == 49 && ans[alen] == 0; 63344123Sbrian#endif 63443693Sbrian break; 63543313Sbrian 63643693Sbrian case CHAP_SUCCESS: 63743693Sbrian case CHAP_FAILURE: 63843693Sbrian /* chap->auth.in.name is already set up at CHALLENGE time */ 63943693Sbrian if ((ans = malloc(len + 1)) == NULL) { 64043693Sbrian log_Printf(LogERROR, "Chap Input: Out of memory !\n"); 64154912Sbrian m_freem(bp); 64246686Sbrian return NULL; 64343693Sbrian } 64443693Sbrian bp = mbuf_Read(bp, ans, len); 64543693Sbrian ans[len] = '\0'; 64643693Sbrian break; 64743401Sbrian } 64836285Sbrian 64943693Sbrian switch (chap->auth.in.hdr.code) { 65043693Sbrian case CHAP_CHALLENGE: 65143693Sbrian case CHAP_RESPONSE: 65243693Sbrian if (*chap->auth.in.name) 65344106Sbrian log_Printf(LogPHASE, "Chap Input: %s (%d bytes from %s%s)\n", 65444106Sbrian chapcodes[chap->auth.in.hdr.code], alen, 65544106Sbrian chap->auth.in.name, 65644123Sbrian#ifdef HAVE_DES 65744106Sbrian lanman && chap->auth.in.hdr.code == CHAP_RESPONSE ? 65844123Sbrian " - lanman" : 65944123Sbrian#endif 66044123Sbrian ""); 66143693Sbrian else 66244106Sbrian log_Printf(LogPHASE, "Chap Input: %s (%d bytes%s)\n", 66344106Sbrian chapcodes[chap->auth.in.hdr.code], alen, 66444123Sbrian#ifdef HAVE_DES 66544106Sbrian lanman && chap->auth.in.hdr.code == CHAP_RESPONSE ? 66644123Sbrian " - lanman" : 66744123Sbrian#endif 66844123Sbrian ""); 66943693Sbrian break; 67036285Sbrian 67143693Sbrian case CHAP_SUCCESS: 67243693Sbrian case CHAP_FAILURE: 67343693Sbrian if (*ans) 67443693Sbrian log_Printf(LogPHASE, "Chap Input: %s (%s)\n", 67543693Sbrian chapcodes[chap->auth.in.hdr.code], ans); 67643693Sbrian else 67743693Sbrian log_Printf(LogPHASE, "Chap Input: %s\n", 67843693Sbrian chapcodes[chap->auth.in.hdr.code]); 67943693Sbrian break; 6806059Samurai } 6816059Samurai 68243693Sbrian switch (chap->auth.in.hdr.code) { 68343693Sbrian case CHAP_CHALLENGE: 68446686Sbrian if (*bundle->cfg.auth.key == '!') 68546686Sbrian chap_StartChild(chap, bundle->cfg.auth.key + 1, 68646686Sbrian bundle->cfg.auth.name); 68743888Sbrian else 68846686Sbrian chap_Respond(chap, bundle->cfg.auth.name, 68946686Sbrian bundle->cfg.auth.key, p->link.lcp.his_authtype 69044123Sbrian#ifdef HAVE_DES 69144123Sbrian , lanman 69244123Sbrian#endif 69344123Sbrian ); 69443693Sbrian break; 6956059Samurai 69643693Sbrian case CHAP_RESPONSE: 69743693Sbrian name = chap->auth.in.name; 69843693Sbrian nlen = strlen(name); 69943693Sbrian#ifndef NORADIUS 70046686Sbrian if (*bundle->radius.cfg.file) { 70148817Sbrian u_char end; 70248817Sbrian 70345907Sbrian end = chap->challenge.local[*chap->challenge.local+1]; 70445907Sbrian chap->challenge.local[*chap->challenge.local+1] = '\0'; 70546686Sbrian radius_Authenticate(&bundle->radius, &chap->auth, 70645907Sbrian chap->auth.in.name, ans, 70745907Sbrian chap->challenge.local + 1); 70845907Sbrian chap->challenge.local[*chap->challenge.local+1] = end; 70943693Sbrian } else 71043693Sbrian#endif 71143693Sbrian { 71246686Sbrian key = auth_GetSecret(bundle, name, nlen, p); 71343693Sbrian if (key) { 71444106Sbrian char *myans; 71544123Sbrian#ifdef HAVE_DES 71644106Sbrian if (lanman && !IsEnabled(p->link.lcp.cfg.chap80lm)) { 71744106Sbrian log_Printf(LogPHASE, "Auth failure: LANMan not enabled\n"); 71844106Sbrian if (chap_HaveAnotherGo(chap)) 71944106Sbrian break; 72043693Sbrian key = NULL; 72144122Sbrian } else if (!lanman && !IsEnabled(p->link.lcp.cfg.chap80nt) && 72244122Sbrian p->link.lcp.want_authtype == 0x80) { 72344106Sbrian log_Printf(LogPHASE, "Auth failure: mschap not enabled\n"); 72444106Sbrian if (chap_HaveAnotherGo(chap)) 72544106Sbrian break; 72644106Sbrian key = NULL; 72744123Sbrian } else 72844123Sbrian#endif 72944123Sbrian { 73044106Sbrian myans = chap_BuildAnswer(name, key, chap->auth.id, 73145907Sbrian chap->challenge.local, 73244123Sbrian p->link.lcp.want_authtype 73344123Sbrian#ifdef HAVE_DES 73444123Sbrian , lanman 73544123Sbrian#endif 73644123Sbrian ); 73744106Sbrian if (myans == NULL) 73843693Sbrian key = NULL; 73944106Sbrian else { 74044123Sbrian if (!chap_Cmp(p->link.lcp.want_authtype, myans + 1, *myans, 74144123Sbrian ans + 1, alen 74244123Sbrian#ifdef HAVE_DES 74344123Sbrian , lanman 74444123Sbrian#endif 74544123Sbrian )) 74644106Sbrian key = NULL; 74744106Sbrian free(myans); 74844106Sbrian } 74943693Sbrian } 75043693Sbrian } 7516059Samurai 75243693Sbrian if (key) 75343693Sbrian chap_Success(&chap->auth); 75443693Sbrian else 75543693Sbrian chap_Failure(&chap->auth); 75643693Sbrian } 7576059Samurai 75843693Sbrian break; 7596059Samurai 7606059Samurai case CHAP_SUCCESS: 76143693Sbrian if (p->link.lcp.auth_iwait == PROTO_CHAP) { 76243693Sbrian p->link.lcp.auth_iwait = 0; 76343693Sbrian if (p->link.lcp.auth_ineed == 0) 76443693Sbrian /* 76543693Sbrian * We've succeeded in our ``login'' 76643693Sbrian * If we're not expecting the peer to authenticate (or he already 76743693Sbrian * has), proceed to network phase. 76843693Sbrian */ 76943693Sbrian datalink_AuthOk(p->dl); 77043693Sbrian } 77143693Sbrian break; 77243693Sbrian 7736059Samurai case CHAP_FAILURE: 77443693Sbrian datalink_AuthNotOk(p->dl); 77543693Sbrian break; 7766059Samurai } 77743693Sbrian free(ans); 7786059Samurai } 77943693Sbrian 78054912Sbrian m_freem(bp); 78146686Sbrian return NULL; 7826059Samurai} 783