Travis Geiselbrecht | 1d0df69 | 2008-09-01 02:26:09 -0700 | [diff] [blame^] | 1 | /***************************************************************************** |
| 2 | * auth.c - Network Authentication and Phase Control program file. |
| 3 | * |
| 4 | * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc. |
| 5 | * Copyright (c) 1997 by Global Election Systems Inc. All rights reserved. |
| 6 | * |
| 7 | * The authors hereby grant permission to use, copy, modify, distribute, |
| 8 | * and license this software and its documentation for any purpose, provided |
| 9 | * that existing copyright notices are retained in all copies and that this |
| 10 | * notice and the following disclaimer are included verbatim in any |
| 11 | * distributions. No written agreement, license, or royalty fee is required |
| 12 | * for any of the authorized uses. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR |
| 15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 17 | * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 24 | * |
| 25 | ****************************************************************************** |
| 26 | * REVISION HISTORY |
| 27 | * |
| 28 | * 03-01-01 Marc Boucher <marc@mbsi.ca> |
| 29 | * Ported to lwIP. |
| 30 | * 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc. |
| 31 | * Ported from public pppd code. |
| 32 | *****************************************************************************/ |
| 33 | /* |
| 34 | * auth.c - PPP authentication and phase control. |
| 35 | * |
| 36 | * Copyright (c) 1993 The Australian National University. |
| 37 | * All rights reserved. |
| 38 | * |
| 39 | * Redistribution and use in source and binary forms are permitted |
| 40 | * provided that the above copyright notice and this paragraph are |
| 41 | * duplicated in all such forms and that any documentation, |
| 42 | * advertising materials, and other materials related to such |
| 43 | * distribution and use acknowledge that the software was developed |
| 44 | * by the Australian National University. The name of the University |
| 45 | * may not be used to endorse or promote products derived from this |
| 46 | * software without specific prior written permission. |
| 47 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
| 48 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
| 49 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 50 | * |
| 51 | * Copyright (c) 1989 Carnegie Mellon University. |
| 52 | * All rights reserved. |
| 53 | * |
| 54 | * Redistribution and use in source and binary forms are permitted |
| 55 | * provided that the above copyright notice and this paragraph are |
| 56 | * duplicated in all such forms and that any documentation, |
| 57 | * advertising materials, and other materials related to such |
| 58 | * distribution and use acknowledge that the software was developed |
| 59 | * by Carnegie Mellon University. The name of the |
| 60 | * University may not be used to endorse or promote products derived |
| 61 | * from this software without specific prior written permission. |
| 62 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
| 63 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
| 64 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 65 | */ |
| 66 | |
| 67 | #include "ppp.h" |
| 68 | #if PPP_SUPPORT > 0 |
| 69 | #include "fsm.h" |
| 70 | #include "lcp.h" |
| 71 | #include "pap.h" |
| 72 | #include "chap.h" |
| 73 | #include "auth.h" |
| 74 | #include "ipcp.h" |
| 75 | |
| 76 | #if CBCP_SUPPORT > 0 |
| 77 | #include "cbcp.h" |
| 78 | #endif |
| 79 | |
| 80 | #include "pppdebug.h" |
| 81 | |
| 82 | |
| 83 | /*************************/ |
| 84 | /*** LOCAL DEFINITIONS ***/ |
| 85 | /*************************/ |
| 86 | |
| 87 | /* Bits in auth_pending[] */ |
| 88 | #define PAP_WITHPEER 1 |
| 89 | #define PAP_PEER 2 |
| 90 | #define CHAP_WITHPEER 4 |
| 91 | #define CHAP_PEER 8 |
| 92 | |
| 93 | |
| 94 | |
| 95 | /************************/ |
| 96 | /*** LOCAL DATA TYPES ***/ |
| 97 | /************************/ |
| 98 | /* Used for storing a sequence of words. Usually malloced. */ |
| 99 | struct wordlist { |
| 100 | struct wordlist *next; |
| 101 | char word[1]; |
| 102 | }; |
| 103 | |
| 104 | |
| 105 | |
| 106 | /***********************************/ |
| 107 | /*** LOCAL FUNCTION DECLARATIONS ***/ |
| 108 | /***********************************/ |
| 109 | extern char *crypt (const char *, const char *); |
| 110 | |
| 111 | /* Prototypes for procedures local to this file. */ |
| 112 | |
| 113 | static void network_phase (int); |
| 114 | static void check_idle (void *); |
| 115 | static void connect_time_expired (void *); |
| 116 | #if 0 |
| 117 | static int login (char *, char *, char **, int *); |
| 118 | #endif |
| 119 | static void logout (void); |
| 120 | static int null_login (int); |
| 121 | static int get_pap_passwd (int, char *, char *); |
| 122 | static int have_pap_secret (void); |
| 123 | static int have_chap_secret (char *, char *, u32_t); |
| 124 | static int ip_addr_check (u32_t, struct wordlist *); |
| 125 | #if 0 /* PAP_SUPPORT > 0 || CHAP_SUPPORT > 0 */ |
| 126 | static void set_allowed_addrs(int unit, struct wordlist *addrs); |
| 127 | static void free_wordlist (struct wordlist *); |
| 128 | #endif |
| 129 | #if CBCP_SUPPORT > 0 |
| 130 | static void callback_phase (int); |
| 131 | #endif |
| 132 | |
| 133 | |
| 134 | /******************************/ |
| 135 | /*** PUBLIC DATA STRUCTURES ***/ |
| 136 | /******************************/ |
| 137 | |
| 138 | |
| 139 | /*****************************/ |
| 140 | /*** LOCAL DATA STRUCTURES ***/ |
| 141 | /*****************************/ |
| 142 | #if PAP_SUPPORT > 0 || CHAP_SUPPORT > 0 |
| 143 | /* The name by which the peer authenticated itself to us. */ |
| 144 | static char peer_authname[MAXNAMELEN]; |
| 145 | #endif |
| 146 | |
| 147 | /* Records which authentication operations haven't completed yet. */ |
| 148 | static int auth_pending[NUM_PPP]; |
| 149 | |
| 150 | /* Set if we have successfully called login() */ |
| 151 | static int logged_in; |
| 152 | |
| 153 | /* Set if we have run the /etc/ppp/auth-up script. */ |
| 154 | static int did_authup; |
| 155 | |
| 156 | /* List of addresses which the peer may use. */ |
| 157 | static struct wordlist *addresses[NUM_PPP]; |
| 158 | |
| 159 | /* Number of network protocols which we have opened. */ |
| 160 | static int num_np_open; |
| 161 | |
| 162 | /* Number of network protocols which have come up. */ |
| 163 | static int num_np_up; |
| 164 | |
| 165 | #if PAP_SUPPORT > 0 || CHAP_SUPPORT > 0 |
| 166 | /* Set if we got the contents of passwd[] from the pap-secrets file. */ |
| 167 | static int passwd_from_file; |
| 168 | #endif |
| 169 | |
| 170 | |
| 171 | |
| 172 | /***********************************/ |
| 173 | /*** PUBLIC FUNCTION DEFINITIONS ***/ |
| 174 | /***********************************/ |
| 175 | /* |
| 176 | * An Open on LCP has requested a change from Dead to Establish phase. |
| 177 | * Do what's necessary to bring the physical layer up. |
| 178 | */ |
| 179 | void link_required(int unit) |
| 180 | { |
| 181 | AUTHDEBUG((LOG_INFO, "link_required: %d\n", unit)); |
| 182 | } |
| 183 | |
| 184 | /* |
| 185 | * LCP has terminated the link; go to the Dead phase and take the |
| 186 | * physical layer down. |
| 187 | */ |
| 188 | void link_terminated(int unit) |
| 189 | { |
| 190 | AUTHDEBUG((LOG_INFO, "link_terminated: %d\n", unit)); |
| 191 | |
| 192 | if (lcp_phase[unit] == PHASE_DEAD) |
| 193 | return; |
| 194 | if (logged_in) |
| 195 | logout(); |
| 196 | lcp_phase[unit] = PHASE_DEAD; |
| 197 | AUTHDEBUG((LOG_NOTICE, "Connection terminated.\n")); |
| 198 | pppMainWakeup(unit); |
| 199 | } |
| 200 | |
| 201 | /* |
| 202 | * LCP has gone down; it will either die or try to re-establish. |
| 203 | */ |
| 204 | void link_down(int unit) |
| 205 | { |
| 206 | int i; |
| 207 | struct protent *protp; |
| 208 | |
| 209 | AUTHDEBUG((LOG_INFO, "link_down: %d\n", unit)); |
| 210 | if (did_authup) { |
| 211 | /* XXX Do link down processing. */ |
| 212 | did_authup = 0; |
| 213 | } |
| 214 | for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) { |
| 215 | if (!protp->enabled_flag) |
| 216 | continue; |
| 217 | if (protp->protocol != PPP_LCP && protp->lowerdown != NULL) |
| 218 | (*protp->lowerdown)(unit); |
| 219 | if (protp->protocol < 0xC000 && protp->close != NULL) |
| 220 | (*protp->close)(unit, "LCP down"); |
| 221 | } |
| 222 | num_np_open = 0; |
| 223 | num_np_up = 0; |
| 224 | if (lcp_phase[unit] != PHASE_DEAD) |
| 225 | lcp_phase[unit] = PHASE_TERMINATE; |
| 226 | pppMainWakeup(unit); |
| 227 | } |
| 228 | |
| 229 | /* |
| 230 | * The link is established. |
| 231 | * Proceed to the Dead, Authenticate or Network phase as appropriate. |
| 232 | */ |
| 233 | void link_established(int unit) |
| 234 | { |
| 235 | int auth; |
| 236 | int i; |
| 237 | struct protent *protp; |
| 238 | lcp_options *wo = &lcp_wantoptions[unit]; |
| 239 | lcp_options *go = &lcp_gotoptions[unit]; |
| 240 | #if PAP_SUPPORT > 0 || CHAP_SUPPORT > 0 |
| 241 | lcp_options *ho = &lcp_hisoptions[unit]; |
| 242 | #endif |
| 243 | |
| 244 | AUTHDEBUG((LOG_INFO, "link_established: %d\n", unit)); |
| 245 | /* |
| 246 | * Tell higher-level protocols that LCP is up. |
| 247 | */ |
| 248 | for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) |
| 249 | if (protp->protocol != PPP_LCP && protp->enabled_flag |
| 250 | && protp->lowerup != NULL) |
| 251 | (*protp->lowerup)(unit); |
| 252 | |
| 253 | if (ppp_settings.auth_required && !(go->neg_chap || go->neg_upap)) { |
| 254 | /* |
| 255 | * We wanted the peer to authenticate itself, and it refused: |
| 256 | * treat it as though it authenticated with PAP using a username |
| 257 | * of "" and a password of "". If that's not OK, boot it out. |
| 258 | */ |
| 259 | if (!wo->neg_upap || !null_login(unit)) { |
| 260 | AUTHDEBUG((LOG_WARNING, "peer refused to authenticate\n")); |
| 261 | lcp_close(unit, "peer refused to authenticate"); |
| 262 | return; |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | lcp_phase[unit] = PHASE_AUTHENTICATE; |
| 267 | auth = 0; |
| 268 | #if CHAP_SUPPORT > 0 |
| 269 | if (go->neg_chap) { |
| 270 | ChapAuthPeer(unit, ppp_settings.our_name, go->chap_mdtype); |
| 271 | auth |= CHAP_PEER; |
| 272 | } |
| 273 | #endif |
| 274 | #if PAP_SUPPORT > 0 && CHAP_SUPPORT > 0 |
| 275 | else |
| 276 | #endif |
| 277 | #if PAP_SUPPORT > 0 |
| 278 | if (go->neg_upap) { |
| 279 | upap_authpeer(unit); |
| 280 | auth |= PAP_PEER; |
| 281 | } |
| 282 | #endif |
| 283 | #if CHAP_SUPPORT > 0 |
| 284 | if (ho->neg_chap) { |
| 285 | ChapAuthWithPeer(unit, ppp_settings.user, ho->chap_mdtype); |
| 286 | auth |= CHAP_WITHPEER; |
| 287 | } |
| 288 | #endif |
| 289 | #if PAP_SUPPORT > 0 && CHAP_SUPPORT > 0 |
| 290 | else |
| 291 | #endif |
| 292 | #if PAP_SUPPORT > 0 |
| 293 | if (ho->neg_upap) { |
| 294 | if (ppp_settings.passwd[0] == 0) { |
| 295 | passwd_from_file = 1; |
| 296 | if (!get_pap_passwd(unit, ppp_settings.user, ppp_settings.passwd)) |
| 297 | AUTHDEBUG((LOG_ERR, "No secret found for PAP login\n")); |
| 298 | } |
| 299 | upap_authwithpeer(unit, ppp_settings.user, ppp_settings.passwd); |
| 300 | auth |= PAP_WITHPEER; |
| 301 | } |
| 302 | #endif |
| 303 | auth_pending[unit] = auth; |
| 304 | |
| 305 | if (!auth) |
| 306 | network_phase(unit); |
| 307 | } |
| 308 | |
| 309 | |
| 310 | /* |
| 311 | * The peer has failed to authenticate himself using `protocol'. |
| 312 | */ |
| 313 | void auth_peer_fail(int unit, u16_t protocol) |
| 314 | { |
| 315 | AUTHDEBUG((LOG_INFO, "auth_peer_fail: %d proto=%X\n", unit, protocol)); |
| 316 | /* |
| 317 | * Authentication failure: take the link down |
| 318 | */ |
| 319 | lcp_close(unit, "Authentication failed"); |
| 320 | } |
| 321 | |
| 322 | |
| 323 | #if PAP_SUPPORT > 0 || CHAP_SUPPORT > 0 |
| 324 | /* |
| 325 | * The peer has been successfully authenticated using `protocol'. |
| 326 | */ |
| 327 | void auth_peer_success(int unit, u16_t protocol, char *name, int namelen) |
| 328 | { |
| 329 | int pbit; |
| 330 | |
| 331 | AUTHDEBUG((LOG_INFO, "auth_peer_success: %d proto=%X\n", unit, protocol)); |
| 332 | switch (protocol) { |
| 333 | case PPP_CHAP: |
| 334 | pbit = CHAP_PEER; |
| 335 | break; |
| 336 | case PPP_PAP: |
| 337 | pbit = PAP_PEER; |
| 338 | break; |
| 339 | default: |
| 340 | AUTHDEBUG((LOG_WARNING, "auth_peer_success: unknown protocol %x\n", |
| 341 | protocol)); |
| 342 | return; |
| 343 | } |
| 344 | |
| 345 | /* |
| 346 | * Save the authenticated name of the peer for later. |
| 347 | */ |
| 348 | if (namelen > sizeof(peer_authname) - 1) |
| 349 | namelen = sizeof(peer_authname) - 1; |
| 350 | BCOPY(name, peer_authname, namelen); |
| 351 | peer_authname[namelen] = 0; |
| 352 | |
| 353 | /* |
| 354 | * If there is no more authentication still to be done, |
| 355 | * proceed to the network (or callback) phase. |
| 356 | */ |
| 357 | if ((auth_pending[unit] &= ~pbit) == 0) |
| 358 | network_phase(unit); |
| 359 | } |
| 360 | |
| 361 | /* |
| 362 | * We have failed to authenticate ourselves to the peer using `protocol'. |
| 363 | */ |
| 364 | void auth_withpeer_fail(int unit, u16_t protocol) |
| 365 | { |
| 366 | int errCode = PPPERR_AUTHFAIL; |
| 367 | |
| 368 | AUTHDEBUG((LOG_INFO, "auth_withpeer_fail: %d proto=%X\n", unit, protocol)); |
| 369 | if (passwd_from_file) |
| 370 | BZERO(ppp_settings.passwd, MAXSECRETLEN); |
| 371 | /* |
| 372 | * XXX Warning: the unit number indicates the interface which is |
| 373 | * not necessarily the PPP connection. It works here as long |
| 374 | * as we are only supporting PPP interfaces. |
| 375 | */ |
| 376 | pppIOCtl(unit, PPPCTLS_ERRCODE, &errCode); |
| 377 | |
| 378 | /* |
| 379 | * We've failed to authenticate ourselves to our peer. |
| 380 | * He'll probably take the link down, and there's not much |
| 381 | * we can do except wait for that. |
| 382 | */ |
| 383 | } |
| 384 | |
| 385 | /* |
| 386 | * We have successfully authenticated ourselves with the peer using `protocol'. |
| 387 | */ |
| 388 | void auth_withpeer_success(int unit, u16_t protocol) |
| 389 | { |
| 390 | int pbit; |
| 391 | |
| 392 | AUTHDEBUG((LOG_INFO, "auth_withpeer_success: %d proto=%X\n", unit, protocol)); |
| 393 | switch (protocol) { |
| 394 | case PPP_CHAP: |
| 395 | pbit = CHAP_WITHPEER; |
| 396 | break; |
| 397 | case PPP_PAP: |
| 398 | if (passwd_from_file) |
| 399 | BZERO(ppp_settings.passwd, MAXSECRETLEN); |
| 400 | pbit = PAP_WITHPEER; |
| 401 | break; |
| 402 | default: |
| 403 | AUTHDEBUG((LOG_WARNING, "auth_peer_success: unknown protocol %x\n", |
| 404 | protocol)); |
| 405 | pbit = 0; |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | * If there is no more authentication still being done, |
| 410 | * proceed to the network (or callback) phase. |
| 411 | */ |
| 412 | if ((auth_pending[unit] &= ~pbit) == 0) |
| 413 | network_phase(unit); |
| 414 | } |
| 415 | #endif |
| 416 | |
| 417 | |
| 418 | /* |
| 419 | * np_up - a network protocol has come up. |
| 420 | */ |
| 421 | void np_up(int unit, u16_t proto) |
| 422 | { |
| 423 | AUTHDEBUG((LOG_INFO, "np_up: %d proto=%X\n", unit, proto)); |
| 424 | if (num_np_up == 0) { |
| 425 | AUTHDEBUG((LOG_INFO, "np_up: maxconnect=%d idle_time_limit=%d\n",ppp_settings.maxconnect,ppp_settings.idle_time_limit)); |
| 426 | /* |
| 427 | * At this point we consider that the link has come up successfully. |
| 428 | */ |
| 429 | if (ppp_settings.idle_time_limit > 0) |
| 430 | TIMEOUT(check_idle, NULL, ppp_settings.idle_time_limit); |
| 431 | |
| 432 | /* |
| 433 | * Set a timeout to close the connection once the maximum |
| 434 | * connect time has expired. |
| 435 | */ |
| 436 | if (ppp_settings.maxconnect > 0) |
| 437 | TIMEOUT(connect_time_expired, 0, ppp_settings.maxconnect); |
| 438 | } |
| 439 | ++num_np_up; |
| 440 | } |
| 441 | |
| 442 | /* |
| 443 | * np_down - a network protocol has gone down. |
| 444 | */ |
| 445 | void np_down(int unit, u16_t proto) |
| 446 | { |
| 447 | AUTHDEBUG((LOG_INFO, "np_down: %d proto=%X\n", unit, proto)); |
| 448 | if (--num_np_up == 0 && ppp_settings.idle_time_limit > 0) { |
| 449 | UNTIMEOUT(check_idle, NULL); |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | /* |
| 454 | * np_finished - a network protocol has finished using the link. |
| 455 | */ |
| 456 | void np_finished(int unit, u16_t proto) |
| 457 | { |
| 458 | AUTHDEBUG((LOG_INFO, "np_finished: %d proto=%X\n", unit, proto)); |
| 459 | if (--num_np_open <= 0) { |
| 460 | /* no further use for the link: shut up shop. */ |
| 461 | lcp_close(0, "No network protocols running"); |
| 462 | } |
| 463 | } |
| 464 | |
| 465 | /* |
| 466 | * auth_reset - called when LCP is starting negotiations to recheck |
| 467 | * authentication options, i.e. whether we have appropriate secrets |
| 468 | * to use for authenticating ourselves and/or the peer. |
| 469 | */ |
| 470 | void auth_reset(int unit) |
| 471 | { |
| 472 | lcp_options *go = &lcp_gotoptions[unit]; |
| 473 | lcp_options *ao = &lcp_allowoptions[0]; |
| 474 | ipcp_options *ipwo = &ipcp_wantoptions[0]; |
| 475 | u32_t remote; |
| 476 | |
| 477 | AUTHDEBUG((LOG_INFO, "auth_reset: %d\n", unit)); |
| 478 | ao->neg_upap = !ppp_settings.refuse_pap && (ppp_settings.passwd[0] != 0 || get_pap_passwd(unit, NULL, NULL)); |
| 479 | ao->neg_chap = !ppp_settings.refuse_chap && ppp_settings.passwd[0] != 0 /*have_chap_secret(ppp_settings.user, ppp_settings.remote_name, (u32_t)0)*/; |
| 480 | |
| 481 | if (go->neg_upap && !have_pap_secret()) |
| 482 | go->neg_upap = 0; |
| 483 | if (go->neg_chap) { |
| 484 | remote = ipwo->accept_remote? 0: ipwo->hisaddr; |
| 485 | if (!have_chap_secret(ppp_settings.remote_name, ppp_settings.our_name, remote)) |
| 486 | go->neg_chap = 0; |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | |
| 491 | #if PAP_SUPPORT > 0 |
| 492 | /* |
| 493 | * check_passwd - Check the user name and passwd against the PAP secrets |
| 494 | * file. If requested, also check against the system password database, |
| 495 | * and login the user if OK. |
| 496 | * |
| 497 | * returns: |
| 498 | * UPAP_AUTHNAK: Authentication failed. |
| 499 | * UPAP_AUTHACK: Authentication succeeded. |
| 500 | * In either case, msg points to an appropriate message. |
| 501 | */ |
| 502 | int check_passwd( |
| 503 | int unit, |
| 504 | char *auser, |
| 505 | int userlen, |
| 506 | char *apasswd, |
| 507 | int passwdlen, |
| 508 | char **msg, |
| 509 | int *msglen |
| 510 | ) |
| 511 | { |
| 512 | #if 1 |
| 513 | *msg = (char *) 0; |
| 514 | return UPAP_AUTHACK; /* XXX Assume all entries OK. */ |
| 515 | #else |
| 516 | int ret = 0; |
| 517 | struct wordlist *addrs = NULL; |
| 518 | char passwd[256], user[256]; |
| 519 | char secret[MAXWORDLEN]; |
| 520 | static u_short attempts = 0; |
| 521 | |
| 522 | /* |
| 523 | * Make copies of apasswd and auser, then null-terminate them. |
| 524 | */ |
| 525 | BCOPY(apasswd, passwd, passwdlen); |
| 526 | passwd[passwdlen] = '\0'; |
| 527 | BCOPY(auser, user, userlen); |
| 528 | user[userlen] = '\0'; |
| 529 | *msg = (char *) 0; |
| 530 | |
| 531 | /* XXX Validate user name and password. */ |
| 532 | ret = UPAP_AUTHACK; /* XXX Assume all entries OK. */ |
| 533 | |
| 534 | if (ret == UPAP_AUTHNAK) { |
| 535 | if (*msg == (char *) 0) |
| 536 | *msg = "Login incorrect"; |
| 537 | *msglen = strlen(*msg); |
| 538 | /* |
| 539 | * Frustrate passwd stealer programs. |
| 540 | * Allow 10 tries, but start backing off after 3 (stolen from login). |
| 541 | * On 10'th, drop the connection. |
| 542 | */ |
| 543 | if (attempts++ >= 10) { |
| 544 | AUTHDEBUG((LOG_WARNING, "%d LOGIN FAILURES BY %s\n", attempts, user)); |
| 545 | /*ppp_panic("Excess Bad Logins");*/ |
| 546 | } |
| 547 | if (attempts > 3) { |
| 548 | sys_msleep((attempts - 3) * 5); |
| 549 | } |
| 550 | if (addrs != NULL) { |
| 551 | free_wordlist(addrs); |
| 552 | } |
| 553 | } else { |
| 554 | attempts = 0; /* Reset count */ |
| 555 | if (*msg == (char *) 0) |
| 556 | *msg = "Login ok"; |
| 557 | *msglen = strlen(*msg); |
| 558 | set_allowed_addrs(unit, addrs); |
| 559 | } |
| 560 | |
| 561 | BZERO(passwd, sizeof(passwd)); |
| 562 | BZERO(secret, sizeof(secret)); |
| 563 | |
| 564 | return ret; |
| 565 | #endif |
| 566 | } |
| 567 | #endif |
| 568 | |
| 569 | |
| 570 | /* |
| 571 | * auth_ip_addr - check whether the peer is authorized to use |
| 572 | * a given IP address. Returns 1 if authorized, 0 otherwise. |
| 573 | */ |
| 574 | int auth_ip_addr(int unit, u32_t addr) |
| 575 | { |
| 576 | return ip_addr_check(addr, addresses[unit]); |
| 577 | } |
| 578 | |
| 579 | /* |
| 580 | * bad_ip_adrs - return 1 if the IP address is one we don't want |
| 581 | * to use, such as an address in the loopback net or a multicast address. |
| 582 | * addr is in network byte order. |
| 583 | */ |
| 584 | int bad_ip_adrs(u32_t addr) |
| 585 | { |
| 586 | addr = ntohl(addr); |
| 587 | return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET |
| 588 | || IN_MULTICAST(addr) || IN_BADCLASS(addr); |
| 589 | } |
| 590 | |
| 591 | |
| 592 | #if CHAP_SUPPORT > 0 |
| 593 | /* |
| 594 | * get_secret - open the CHAP secret file and return the secret |
| 595 | * for authenticating the given client on the given server. |
| 596 | * (We could be either client or server). |
| 597 | */ |
| 598 | int get_secret( |
| 599 | int unit, |
| 600 | char *client, |
| 601 | char *server, |
| 602 | char *secret, |
| 603 | int *secret_len, |
| 604 | int save_addrs |
| 605 | ) |
| 606 | { |
| 607 | #if 1 |
| 608 | int len; |
| 609 | struct wordlist *addrs; |
| 610 | |
| 611 | addrs = NULL; |
| 612 | |
| 613 | if(!client || !client[0] || strcmp(client, ppp_settings.user)) { |
| 614 | return 0; |
| 615 | } |
| 616 | |
| 617 | len = strlen(ppp_settings.passwd); |
| 618 | if (len > MAXSECRETLEN) { |
| 619 | AUTHDEBUG((LOG_ERR, "Secret for %s on %s is too long\n", client, server)); |
| 620 | len = MAXSECRETLEN; |
| 621 | } |
| 622 | BCOPY(ppp_settings.passwd, secret, len); |
| 623 | *secret_len = len; |
| 624 | |
| 625 | return 1; |
| 626 | #else |
| 627 | int ret = 0, len; |
| 628 | struct wordlist *addrs; |
| 629 | char secbuf[MAXWORDLEN]; |
| 630 | |
| 631 | addrs = NULL; |
| 632 | secbuf[0] = 0; |
| 633 | |
| 634 | /* XXX Find secret. */ |
| 635 | if (ret < 0) |
| 636 | return 0; |
| 637 | |
| 638 | if (save_addrs) |
| 639 | set_allowed_addrs(unit, addrs); |
| 640 | |
| 641 | len = strlen(secbuf); |
| 642 | if (len > MAXSECRETLEN) { |
| 643 | AUTHDEBUG((LOG_ERR, "Secret for %s on %s is too long\n", client, server)); |
| 644 | len = MAXSECRETLEN; |
| 645 | } |
| 646 | BCOPY(secbuf, secret, len); |
| 647 | BZERO(secbuf, sizeof(secbuf)); |
| 648 | *secret_len = len; |
| 649 | |
| 650 | return 1; |
| 651 | #endif |
| 652 | } |
| 653 | #endif |
| 654 | |
| 655 | |
| 656 | #if 0 /* UNUSED */ |
| 657 | /* |
| 658 | * auth_check_options - called to check authentication options. |
| 659 | */ |
| 660 | void auth_check_options(void) |
| 661 | { |
| 662 | lcp_options *wo = &lcp_wantoptions[0]; |
| 663 | int can_auth; |
| 664 | ipcp_options *ipwo = &ipcp_wantoptions[0]; |
| 665 | u32_t remote; |
| 666 | |
| 667 | /* Default our_name to hostname, and user to our_name */ |
| 668 | if (ppp_settings.our_name[0] == 0 || ppp_settings.usehostname) |
| 669 | strcpy(ppp_settings.our_name, ppp_settings.hostname); |
| 670 | if (ppp_settings.user[0] == 0) |
| 671 | strcpy(ppp_settings.user, ppp_settings.our_name); |
| 672 | |
| 673 | /* If authentication is required, ask peer for CHAP or PAP. */ |
| 674 | if (ppp_settings.auth_required && !wo->neg_chap && !wo->neg_upap) { |
| 675 | wo->neg_chap = 1; |
| 676 | wo->neg_upap = 1; |
| 677 | } |
| 678 | |
| 679 | /* |
| 680 | * Check whether we have appropriate secrets to use |
| 681 | * to authenticate the peer. |
| 682 | */ |
| 683 | can_auth = wo->neg_upap && have_pap_secret(); |
| 684 | if (!can_auth && wo->neg_chap) { |
| 685 | remote = ipwo->accept_remote? 0: ipwo->hisaddr; |
| 686 | can_auth = have_chap_secret(ppp_settings.remote_name, ppp_settings.our_name, remote); |
| 687 | } |
| 688 | |
| 689 | if (ppp_settings.auth_required && !can_auth) { |
| 690 | ppp_panic("No auth secret"); |
| 691 | } |
| 692 | } |
| 693 | #endif |
| 694 | |
| 695 | |
| 696 | /**********************************/ |
| 697 | /*** LOCAL FUNCTION DEFINITIONS ***/ |
| 698 | /**********************************/ |
| 699 | /* |
| 700 | * Proceed to the network phase. |
| 701 | */ |
| 702 | static void network_phase(int unit) |
| 703 | { |
| 704 | int i; |
| 705 | struct protent *protp; |
| 706 | lcp_options *go = &lcp_gotoptions[unit]; |
| 707 | |
| 708 | /* |
| 709 | * If the peer had to authenticate, run the auth-up script now. |
| 710 | */ |
| 711 | if ((go->neg_chap || go->neg_upap) && !did_authup) { |
| 712 | /* XXX Do setup for peer authentication. */ |
| 713 | did_authup = 1; |
| 714 | } |
| 715 | |
| 716 | #if CBCP_SUPPORT > 0 |
| 717 | /* |
| 718 | * If we negotiated callback, do it now. |
| 719 | */ |
| 720 | if (go->neg_cbcp) { |
| 721 | lcp_phase[unit] = PHASE_CALLBACK; |
| 722 | (*cbcp_protent.open)(unit); |
| 723 | return; |
| 724 | } |
| 725 | #endif |
| 726 | |
| 727 | lcp_phase[unit] = PHASE_NETWORK; |
| 728 | for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) |
| 729 | if (protp->protocol < 0xC000 && protp->enabled_flag |
| 730 | && protp->open != NULL) { |
| 731 | (*protp->open)(unit); |
| 732 | if (protp->protocol != PPP_CCP) |
| 733 | ++num_np_open; |
| 734 | } |
| 735 | |
| 736 | if (num_np_open == 0) |
| 737 | /* nothing to do */ |
| 738 | lcp_close(0, "No network protocols running"); |
| 739 | } |
| 740 | |
| 741 | /* |
| 742 | * check_idle - check whether the link has been idle for long |
| 743 | * enough that we can shut it down. |
| 744 | */ |
| 745 | static void check_idle(void *arg) |
| 746 | { |
| 747 | struct ppp_idle idle; |
| 748 | u_short itime; |
| 749 | |
| 750 | (void)arg; |
| 751 | if (!get_idle_time(0, &idle)) |
| 752 | return; |
| 753 | itime = LWIP_MIN(idle.xmit_idle, idle.recv_idle); |
| 754 | if (itime >= ppp_settings.idle_time_limit) { |
| 755 | /* link is idle: shut it down. */ |
| 756 | AUTHDEBUG((LOG_INFO, "Terminating connection due to lack of activity.\n")); |
| 757 | lcp_close(0, "Link inactive"); |
| 758 | } else { |
| 759 | TIMEOUT(check_idle, NULL, ppp_settings.idle_time_limit - itime); |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | /* |
| 764 | * connect_time_expired - log a message and close the connection. |
| 765 | */ |
| 766 | static void connect_time_expired(void *arg) |
| 767 | { |
| 768 | (void)arg; |
| 769 | |
| 770 | AUTHDEBUG((LOG_INFO, "Connect time expired\n")); |
| 771 | lcp_close(0, "Connect time expired"); /* Close connection */ |
| 772 | } |
| 773 | |
| 774 | #if 0 |
| 775 | /* |
| 776 | * login - Check the user name and password against the system |
| 777 | * password database, and login the user if OK. |
| 778 | * |
| 779 | * returns: |
| 780 | * UPAP_AUTHNAK: Login failed. |
| 781 | * UPAP_AUTHACK: Login succeeded. |
| 782 | * In either case, msg points to an appropriate message. |
| 783 | */ |
| 784 | static int login(char *user, char *passwd, char **msg, int *msglen) |
| 785 | { |
| 786 | /* XXX Fail until we decide that we want to support logins. */ |
| 787 | return (UPAP_AUTHNAK); |
| 788 | } |
| 789 | #endif |
| 790 | |
| 791 | /* |
| 792 | * logout - Logout the user. |
| 793 | */ |
| 794 | static void logout(void) |
| 795 | { |
| 796 | logged_in = 0; |
| 797 | } |
| 798 | |
| 799 | |
| 800 | /* |
| 801 | * null_login - Check if a username of "" and a password of "" are |
| 802 | * acceptable, and iff so, set the list of acceptable IP addresses |
| 803 | * and return 1. |
| 804 | */ |
| 805 | static int null_login(int unit) |
| 806 | { |
| 807 | (void)unit; |
| 808 | /* XXX Fail until we decide that we want to support logins. */ |
| 809 | return 0; |
| 810 | } |
| 811 | |
| 812 | |
| 813 | /* |
| 814 | * get_pap_passwd - get a password for authenticating ourselves with |
| 815 | * our peer using PAP. Returns 1 on success, 0 if no suitable password |
| 816 | * could be found. |
| 817 | */ |
| 818 | static int get_pap_passwd(int unit, char *user, char *passwd) |
| 819 | { |
| 820 | /* normally we would reject PAP if no password is provided, |
| 821 | but this causes problems with some providers (like CHT in Taiwan) |
| 822 | who incorrectly request PAP and expect a bogus/empty password, so |
| 823 | always provide a default user/passwd of "none"/"none" |
| 824 | */ |
| 825 | if(user) |
| 826 | strcpy(user, "none"); |
| 827 | if(passwd) |
| 828 | strcpy(passwd, "none"); |
| 829 | |
| 830 | return 1; |
| 831 | } |
| 832 | |
| 833 | |
| 834 | /* |
| 835 | * have_pap_secret - check whether we have a PAP file with any |
| 836 | * secrets that we could possibly use for authenticating the peer. |
| 837 | */ |
| 838 | static int have_pap_secret(void) |
| 839 | { |
| 840 | /* XXX Fail until we set up our passwords. */ |
| 841 | return 0; |
| 842 | } |
| 843 | |
| 844 | |
| 845 | /* |
| 846 | * have_chap_secret - check whether we have a CHAP file with a |
| 847 | * secret that we could possibly use for authenticating `client' |
| 848 | * on `server'. Either can be the null string, meaning we don't |
| 849 | * know the identity yet. |
| 850 | */ |
| 851 | static int have_chap_secret(char *client, char *server, u32_t remote) |
| 852 | { |
| 853 | (void)client; |
| 854 | (void)server; |
| 855 | (void)remote; |
| 856 | /* XXX Fail until we set up our passwords. */ |
| 857 | return 0; |
| 858 | } |
| 859 | |
| 860 | |
| 861 | #if 0 /* PAP_SUPPORT > 0 || CHAP_SUPPORT > 0 */ |
| 862 | /* |
| 863 | * set_allowed_addrs() - set the list of allowed addresses. |
| 864 | */ |
| 865 | static void set_allowed_addrs(int unit, struct wordlist *addrs) |
| 866 | { |
| 867 | if (addresses[unit] != NULL) |
| 868 | free_wordlist(addresses[unit]); |
| 869 | addresses[unit] = addrs; |
| 870 | |
| 871 | #if 0 |
| 872 | /* |
| 873 | * If there's only one authorized address we might as well |
| 874 | * ask our peer for that one right away |
| 875 | */ |
| 876 | if (addrs != NULL && addrs->next == NULL) { |
| 877 | char *p = addrs->word; |
| 878 | struct ipcp_options *wo = &ipcp_wantoptions[unit]; |
| 879 | u32_t a; |
| 880 | struct hostent *hp; |
| 881 | |
| 882 | if (wo->hisaddr == 0 && *p != '!' && *p != '-' |
| 883 | && strchr(p, '/') == NULL) { |
| 884 | hp = gethostbyname(p); |
| 885 | if (hp != NULL && hp->h_addrtype == AF_INET) |
| 886 | a = *(u32_t *)hp->h_addr; |
| 887 | else |
| 888 | a = inet_addr(p); |
| 889 | if (a != (u32_t) -1) |
| 890 | wo->hisaddr = a; |
| 891 | } |
| 892 | } |
| 893 | #endif |
| 894 | } |
| 895 | #endif |
| 896 | |
| 897 | static int ip_addr_check(u32_t addr, struct wordlist *addrs) |
| 898 | { |
| 899 | |
| 900 | /* don't allow loopback or multicast address */ |
| 901 | if (bad_ip_adrs(addr)) |
| 902 | return 0; |
| 903 | |
| 904 | if (addrs == NULL) |
| 905 | return !ppp_settings.auth_required; /* no addresses authorized */ |
| 906 | |
| 907 | /* XXX All other addresses allowed. */ |
| 908 | return 1; |
| 909 | } |
| 910 | |
| 911 | #if 0 /* PAP_SUPPORT > 0 || CHAP_SUPPORT */ |
| 912 | /* |
| 913 | * free_wordlist - release memory allocated for a wordlist. |
| 914 | */ |
| 915 | static void free_wordlist(struct wordlist *wp) |
| 916 | { |
| 917 | struct wordlist *next; |
| 918 | |
| 919 | while (wp != NULL) { |
| 920 | next = wp->next; |
| 921 | free(wp); |
| 922 | wp = next; |
| 923 | } |
| 924 | } |
| 925 | #endif |
| 926 | |
| 927 | #endif /* PPP_SUPPORT */ |