1 /*- 2 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> 3 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> 4 * Internet Initiative Japan, Inc (IIJ) 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include <sys/param.h> 32 #include <netinet/in.h> 33 #include <netinet/in_systm.h> 34 #include <netinet/ip.h> 35 #include <sys/socket.h> 36 #include <sys/un.h> 37 38 #include <pwd.h> 39 #include <stdio.h> 40 #include <string.h> 41 #include <termios.h> 42 #include <unistd.h> 43 44 #include "layer.h" 45 #include "mbuf.h" 46 #include "defs.h" 47 #include "log.h" 48 #include "timer.h" 49 #include "fsm.h" 50 #include "iplist.h" 51 #include "throughput.h" 52 #include "slcompress.h" 53 #include "lqr.h" 54 #include "hdlc.h" 55 #include "ncpaddr.h" 56 #include "ip.h" 57 #include "ipcp.h" 58 #include "auth.h" 59 #include "systems.h" 60 #include "lcp.h" 61 #include "ccp.h" 62 #include "link.h" 63 #include "descriptor.h" 64 #include "chat.h" 65 #include "proto.h" 66 #include "filter.h" 67 #include "mp.h" 68 #ifndef NORADIUS 69 #include "radius.h" 70 #endif 71 #include "cbcp.h" 72 #include "chap.h" 73 #include "async.h" 74 #include "physical.h" 75 #include "datalink.h" 76 #include "ipv6cp.h" 77 #include "ncp.h" 78 #include "bundle.h" 79 80 const char * 81 Auth2Nam(u_short auth, u_char type) 82 { 83 static char chap[10]; 84 85 switch (auth) { 86 case PROTO_PAP: 87 return "PAP"; 88 case PROTO_CHAP: 89 snprintf(chap, sizeof chap, "CHAP 0x%02x", type); 90 return chap; 91 case 0: 92 return "none"; 93 } 94 return "unknown"; 95 } 96 97 static int 98 auth_CheckPasswd(const char *name, const char *data, const char *key) 99 { 100 if (!strcmp(data, "*")) { 101 /* Then look up the real password database */ 102 struct passwd *pw; 103 int result; 104 105 result = (pw = getpwnam(name)) && 106 !strcmp(crypt(key, pw->pw_passwd), pw->pw_passwd); 107 endpwent(); 108 return result; 109 } 110 111 return !strcmp(data, key); 112 } 113 114 int 115 auth_SetPhoneList(const char *name, char *phone, int phonelen) 116 { 117 FILE *fp; 118 int n, lineno; 119 char *vector[6], buff[LINE_LEN]; 120 const char *slash; 121 122 fp = OpenSecret(SECRETFILE); 123 if (fp != NULL) { 124 again: 125 lineno = 0; 126 while (fgets(buff, sizeof buff, fp)) { 127 lineno++; 128 if (buff[0] == '#') 129 continue; 130 buff[strlen(buff) - 1] = '\0'; 131 memset(vector, '\0', sizeof vector); 132 if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0) 133 log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno); 134 if (n < 5) 135 continue; 136 if (strcmp(vector[0], name) == 0) { 137 CloseSecret(fp); 138 if (*vector[4] == '\0') 139 return 0; 140 strncpy(phone, vector[4], phonelen - 1); 141 phone[phonelen - 1] = '\0'; 142 return 1; /* Valid */ 143 } 144 } 145 146 if ((slash = strrchr(name, '\\')) != NULL && slash[1]) { 147 /* Look for the name without the leading domain */ 148 name = slash + 1; 149 rewind(fp); 150 goto again; 151 } 152 153 CloseSecret(fp); 154 } 155 *phone = '\0'; 156 return 0; 157 } 158 159 int 160 auth_Select(struct bundle *bundle, const char *name) 161 { 162 FILE *fp; 163 int n, lineno; 164 char *vector[5], buff[LINE_LEN]; 165 const char *slash; 166 167 if (*name == '\0') { 168 ipcp_Setup(&bundle->ncp.ipcp, INADDR_NONE); 169 return 1; 170 } 171 172 #ifndef NORADIUS 173 if (bundle->radius.valid && bundle->radius.ip.s_addr != INADDR_NONE) { 174 /* We've got a radius IP - it overrides everything */ 175 if (!ipcp_UseHisIPaddr(bundle, bundle->radius.ip)) 176 return 0; 177 ipcp_Setup(&bundle->ncp.ipcp, bundle->radius.mask.s_addr); 178 /* Continue with ppp.secret in case we've got a new label */ 179 } 180 #endif 181 182 fp = OpenSecret(SECRETFILE); 183 if (fp != NULL) { 184 again: 185 lineno = 0; 186 while (fgets(buff, sizeof buff, fp)) { 187 lineno++; 188 if (buff[0] == '#') 189 continue; 190 buff[strlen(buff) - 1] = '\0'; 191 memset(vector, '\0', sizeof vector); 192 if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0) 193 log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno); 194 if (n < 2) 195 continue; 196 if (strcmp(vector[0], name) == 0) { 197 CloseSecret(fp); 198 #ifndef NORADIUS 199 if (!bundle->radius.valid || bundle->radius.ip.s_addr == INADDR_NONE) { 200 #endif 201 if (n > 2 && *vector[2] && strcmp(vector[2], "*") && 202 !ipcp_UseHisaddr(bundle, vector[2], 1)) 203 return 0; 204 ipcp_Setup(&bundle->ncp.ipcp, INADDR_NONE); 205 #ifndef NORADIUS 206 } 207 #endif 208 if (n > 3 && *vector[3] && strcmp(vector[3], "*")) 209 bundle_SetLabel(bundle, vector[3]); 210 return 1; /* Valid */ 211 } 212 } 213 214 if ((slash = strrchr(name, '\\')) != NULL && slash[1]) { 215 /* Look for the name without the leading domain */ 216 name = slash + 1; 217 rewind(fp); 218 goto again; 219 } 220 221 CloseSecret(fp); 222 } 223 224 #ifndef NOPASSWDAUTH 225 /* Let 'em in anyway - they must have been in the passwd file */ 226 ipcp_Setup(&bundle->ncp.ipcp, INADDR_NONE); 227 return 1; 228 #else 229 #ifndef NORADIUS 230 if (bundle->radius.valid) 231 return 1; 232 #endif 233 234 /* Disappeared from ppp.secret ??? */ 235 return 0; 236 #endif 237 } 238 239 int 240 auth_Validate(struct bundle *bundle, const char *name, 241 const char *key, struct physical *physical) 242 { 243 /* Used by PAP routines */ 244 245 FILE *fp; 246 int n, lineno; 247 char *vector[5], buff[LINE_LEN]; 248 const char *slash; 249 250 fp = OpenSecret(SECRETFILE); 251 again: 252 lineno = 0; 253 if (fp != NULL) { 254 while (fgets(buff, sizeof buff, fp)) { 255 lineno++; 256 if (buff[0] == '#') 257 continue; 258 buff[strlen(buff) - 1] = 0; 259 memset(vector, '\0', sizeof vector); 260 if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0) 261 log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno); 262 if (n < 2) 263 continue; 264 if (strcmp(vector[0], name) == 0) { 265 CloseSecret(fp); 266 return auth_CheckPasswd(name, vector[1], key); 267 } 268 } 269 } 270 271 if ((slash = strrchr(name, '\\')) != NULL && slash[1]) { 272 /* Look for the name without the leading domain */ 273 name = slash + 1; 274 if (fp != NULL) { 275 rewind(fp); 276 goto again; 277 } 278 } 279 280 if (fp != NULL) 281 CloseSecret(fp); 282 283 #ifndef NOPASSWDAUTH 284 if (Enabled(bundle, OPT_PASSWDAUTH)) 285 return auth_CheckPasswd(name, "*", key); 286 #endif 287 288 return 0; /* Invalid */ 289 } 290 291 char * 292 auth_GetSecret(struct bundle *bundle, const char *name, int len, 293 struct physical *physical) 294 { 295 /* Used by CHAP routines */ 296 297 FILE *fp; 298 int n, lineno; 299 char *vector[5]; 300 const char *slash; 301 static char buff[LINE_LEN]; /* vector[] will point here when returned */ 302 303 fp = OpenSecret(SECRETFILE); 304 if (fp == NULL) 305 return (NULL); 306 307 again: 308 lineno = 0; 309 while (fgets(buff, sizeof buff, fp)) { 310 lineno++; 311 if (buff[0] == '#') 312 continue; 313 n = strlen(buff) - 1; 314 if (buff[n] == '\n') 315 buff[n] = '\0'; /* Trim the '\n' */ 316 memset(vector, '\0', sizeof vector); 317 if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0) 318 log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno); 319 if (n < 2) 320 continue; 321 if (strlen(vector[0]) == len && strncmp(vector[0], name, len) == 0) { 322 CloseSecret(fp); 323 return vector[1]; 324 } 325 } 326 327 if ((slash = strrchr(name, '\\')) != NULL && slash[1]) { 328 /* Go back and look for the name without the leading domain */ 329 len -= slash - name + 1; 330 name = slash + 1; 331 rewind(fp); 332 goto again; 333 } 334 335 CloseSecret(fp); 336 return (NULL); /* Invalid */ 337 } 338 339 static void 340 AuthTimeout(void *vauthp) 341 { 342 struct authinfo *authp = (struct authinfo *)vauthp; 343 344 timer_Stop(&authp->authtimer); 345 if (--authp->retry > 0) { 346 authp->id++; 347 (*authp->fn.req)(authp); 348 timer_Start(&authp->authtimer); 349 } else { 350 log_Printf(LogPHASE, "Auth: No response from server\n"); 351 datalink_AuthNotOk(authp->physical->dl); 352 } 353 } 354 355 void 356 auth_Init(struct authinfo *authp, struct physical *p, auth_func req, 357 auth_func success, auth_func failure) 358 { 359 memset(authp, '\0', sizeof(struct authinfo)); 360 authp->cfg.fsm.timeout = DEF_FSMRETRY; 361 authp->cfg.fsm.maxreq = DEF_FSMAUTHTRIES; 362 authp->cfg.fsm.maxtrm = 0; /* not used */ 363 authp->fn.req = req; 364 authp->fn.success = success; 365 authp->fn.failure = failure; 366 authp->physical = p; 367 } 368 369 void 370 auth_StartReq(struct authinfo *authp) 371 { 372 timer_Stop(&authp->authtimer); 373 authp->authtimer.func = AuthTimeout; 374 authp->authtimer.name = "auth"; 375 authp->authtimer.load = authp->cfg.fsm.timeout * SECTICKS; 376 authp->authtimer.arg = (void *)authp; 377 authp->retry = authp->cfg.fsm.maxreq; 378 authp->id = 1; 379 (*authp->fn.req)(authp); 380 timer_Start(&authp->authtimer); 381 } 382 383 void 384 auth_StopTimer(struct authinfo *authp) 385 { 386 timer_Stop(&authp->authtimer); 387 } 388 389 struct mbuf * 390 auth_ReadHeader(struct authinfo *authp, struct mbuf *bp) 391 { 392 int len; 393 394 len = m_length(bp); 395 if (len >= sizeof authp->in.hdr) { 396 bp = mbuf_Read(bp, (u_char *)&authp->in.hdr, sizeof authp->in.hdr); 397 if (len >= ntohs(authp->in.hdr.length)) 398 return bp; 399 authp->in.hdr.length = htons(0); 400 log_Printf(LogWARN, "auth_ReadHeader: Short packet (%d > %d) !\n", 401 ntohs(authp->in.hdr.length), len); 402 } else { 403 authp->in.hdr.length = htons(0); 404 log_Printf(LogWARN, "auth_ReadHeader: Short packet header (%d > %d) !\n", 405 (int)(sizeof authp->in.hdr), len); 406 } 407 408 m_freem(bp); 409 return NULL; 410 } 411 412 struct mbuf * 413 auth_ReadName(struct authinfo *authp, struct mbuf *bp, int len) 414 { 415 if (len > sizeof authp->in.name - 1) 416 log_Printf(LogWARN, "auth_ReadName: Name too long (%d) !\n", len); 417 else { 418 int mlen = m_length(bp); 419 420 if (len > mlen) 421 log_Printf(LogWARN, "auth_ReadName: Short packet (%d > %d) !\n", 422 len, mlen); 423 else { 424 bp = mbuf_Read(bp, (u_char *)authp->in.name, len); 425 authp->in.name[len] = '\0'; 426 return bp; 427 } 428 } 429 430 *authp->in.name = '\0'; 431 m_freem(bp); 432 return NULL; 433 } 434