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: src/usr.sbin/ppp/auth.c,v 1.50.2.2 2002/09/01 02:12:22 brian Exp $ 29 * $DragonFly: src/usr.sbin/ppp/auth.c,v 1.2 2003/06/17 04:30:00 dillon Exp $ 30 */ 31 32 #include <sys/param.h> 33 #include <netinet/in.h> 34 #include <netinet/in_systm.h> 35 #include <netinet/ip.h> 36 #include <sys/socket.h> 37 #include <sys/un.h> 38 39 #include <pwd.h> 40 #include <stdio.h> 41 #include <string.h> 42 #include <termios.h> 43 #include <unistd.h> 44 45 #include "layer.h" 46 #include "mbuf.h" 47 #include "defs.h" 48 #include "log.h" 49 #include "timer.h" 50 #include "fsm.h" 51 #include "iplist.h" 52 #include "throughput.h" 53 #include "slcompress.h" 54 #include "lqr.h" 55 #include "hdlc.h" 56 #include "ncpaddr.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 bundle->radius.ip.s_addr != RADIUS_INADDR_POOL) { 175 /* We've got a radius IP - it overrides everything */ 176 if (!ipcp_UseHisIPaddr(bundle, bundle->radius.ip)) 177 return 0; 178 ipcp_Setup(&bundle->ncp.ipcp, bundle->radius.mask.s_addr); 179 /* Continue with ppp.secret in case we've got a new label */ 180 } 181 #endif 182 183 fp = OpenSecret(SECRETFILE); 184 if (fp != NULL) { 185 again: 186 lineno = 0; 187 while (fgets(buff, sizeof buff, fp)) { 188 lineno++; 189 if (buff[0] == '#') 190 continue; 191 buff[strlen(buff) - 1] = '\0'; 192 memset(vector, '\0', sizeof vector); 193 if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0) 194 log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno); 195 if (n < 2) 196 continue; 197 if (strcmp(vector[0], name) == 0) { 198 CloseSecret(fp); 199 #ifndef NORADIUS 200 if (!bundle->radius.valid || bundle->radius.ip.s_addr == INADDR_NONE) { 201 #endif 202 if (n > 2 && *vector[2] && strcmp(vector[2], "*") && 203 !ipcp_UseHisaddr(bundle, vector[2], 1)) 204 return 0; 205 ipcp_Setup(&bundle->ncp.ipcp, INADDR_NONE); 206 #ifndef NORADIUS 207 } 208 #endif 209 if (n > 3 && *vector[3] && strcmp(vector[3], "*")) 210 bundle_SetLabel(bundle, vector[3]); 211 return 1; /* Valid */ 212 } 213 } 214 215 if ((slash = strrchr(name, '\\')) != NULL && slash[1]) { 216 /* Look for the name without the leading domain */ 217 name = slash + 1; 218 rewind(fp); 219 goto again; 220 } 221 222 CloseSecret(fp); 223 } 224 225 #ifndef NOPASSWDAUTH 226 /* Let 'em in anyway - they must have been in the passwd file */ 227 ipcp_Setup(&bundle->ncp.ipcp, INADDR_NONE); 228 return 1; 229 #else 230 #ifndef NORADIUS 231 if (bundle->radius.valid) 232 return 1; 233 #endif 234 235 /* Disappeared from ppp.secret ??? */ 236 return 0; 237 #endif 238 } 239 240 int 241 auth_Validate(struct bundle *bundle, const char *name, const char *key) 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(const char *name, size_t len) 293 { 294 /* Used by CHAP routines */ 295 296 FILE *fp; 297 int n, lineno; 298 char *vector[5]; 299 const char *slash; 300 static char buff[LINE_LEN]; /* vector[] will point here when returned */ 301 302 fp = OpenSecret(SECRETFILE); 303 if (fp == NULL) 304 return (NULL); 305 306 again: 307 lineno = 0; 308 while (fgets(buff, sizeof buff, fp)) { 309 lineno++; 310 if (buff[0] == '#') 311 continue; 312 n = strlen(buff) - 1; 313 if (buff[n] == '\n') 314 buff[n] = '\0'; /* Trim the '\n' */ 315 memset(vector, '\0', sizeof vector); 316 if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0) 317 log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno); 318 if (n < 2) 319 continue; 320 if (strlen(vector[0]) == len && strncmp(vector[0], name, len) == 0) { 321 CloseSecret(fp); 322 return vector[1]; 323 } 324 } 325 326 if ((slash = strrchr(name, '\\')) != NULL && slash[1]) { 327 /* Go back and look for the name without the leading domain */ 328 len -= slash - name + 1; 329 name = slash + 1; 330 rewind(fp); 331 goto again; 332 } 333 334 CloseSecret(fp); 335 return (NULL); /* Invalid */ 336 } 337 338 static void 339 AuthTimeout(void *vauthp) 340 { 341 struct authinfo *authp = (struct authinfo *)vauthp; 342 343 timer_Stop(&authp->authtimer); 344 if (--authp->retry > 0) { 345 authp->id++; 346 (*authp->fn.req)(authp); 347 timer_Start(&authp->authtimer); 348 } else { 349 log_Printf(LogPHASE, "Auth: No response from server\n"); 350 datalink_AuthNotOk(authp->physical->dl); 351 } 352 } 353 354 void 355 auth_Init(struct authinfo *authp, struct physical *p, auth_func req, 356 auth_func success, auth_func failure) 357 { 358 memset(authp, '\0', sizeof(struct authinfo)); 359 authp->cfg.fsm.timeout = DEF_FSMRETRY; 360 authp->cfg.fsm.maxreq = DEF_FSMAUTHTRIES; 361 authp->cfg.fsm.maxtrm = 0; /* not used */ 362 authp->fn.req = req; 363 authp->fn.success = success; 364 authp->fn.failure = failure; 365 authp->physical = p; 366 } 367 368 void 369 auth_StartReq(struct authinfo *authp) 370 { 371 timer_Stop(&authp->authtimer); 372 authp->authtimer.func = AuthTimeout; 373 authp->authtimer.name = "auth"; 374 authp->authtimer.load = authp->cfg.fsm.timeout * SECTICKS; 375 authp->authtimer.arg = (void *)authp; 376 authp->retry = authp->cfg.fsm.maxreq; 377 authp->id = 1; 378 (*authp->fn.req)(authp); 379 timer_Start(&authp->authtimer); 380 } 381 382 void 383 auth_StopTimer(struct authinfo *authp) 384 { 385 timer_Stop(&authp->authtimer); 386 } 387 388 struct mbuf * 389 auth_ReadHeader(struct authinfo *authp, struct mbuf *bp) 390 { 391 size_t len; 392 393 len = m_length(bp); 394 if (len >= sizeof authp->in.hdr) { 395 bp = mbuf_Read(bp, (u_char *)&authp->in.hdr, sizeof authp->in.hdr); 396 if (len >= ntohs(authp->in.hdr.length)) 397 return bp; 398 authp->in.hdr.length = htons(0); 399 log_Printf(LogWARN, "auth_ReadHeader: Short packet (%u > %zu) !\n", 400 ntohs(authp->in.hdr.length), len); 401 } else { 402 authp->in.hdr.length = htons(0); 403 log_Printf(LogWARN, "auth_ReadHeader: Short packet header (%u > %zu) !\n", 404 (int)(sizeof authp->in.hdr), len); 405 } 406 407 m_freem(bp); 408 return NULL; 409 } 410 411 struct mbuf * 412 auth_ReadName(struct authinfo *authp, struct mbuf *bp, size_t len) 413 { 414 if (len > sizeof authp->in.name - 1) 415 log_Printf(LogWARN, "auth_ReadName: Name too long (%zu) !\n", len); 416 else { 417 size_t mlen = m_length(bp); 418 419 if (len > mlen) 420 log_Printf(LogWARN, "auth_ReadName: Short packet (%zu > %zu) !\n", 421 len, mlen); 422 else { 423 bp = mbuf_Read(bp, (u_char *)authp->in.name, len); 424 authp->in.name[len] = '\0'; 425 return bp; 426 } 427 } 428 429 *authp->in.name = '\0'; 430 m_freem(bp); 431 return NULL; 432 } 433