1 /* $NetBSD: auth.c,v 1.4 2014/10/25 21:11:37 christos Exp $ */ 2 3 /* 4 * auth.c - PPP authentication and phase control. 5 * 6 * Copyright (c) 1993-2002 Paul Mackerras. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. The name(s) of the authors of this software must not be used to 16 * endorse or promote products derived from this software without 17 * prior written permission. 18 * 19 * 3. Redistributions of any form whatsoever must retain the following 20 * acknowledgment: 21 * "This product includes software developed by Paul Mackerras 22 * <paulus@samba.org>". 23 * 24 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO 25 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 26 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY 27 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 28 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 29 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 30 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 31 * 32 * Derived from main.c, which is: 33 * 34 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in 45 * the documentation and/or other materials provided with the 46 * distribution. 47 * 48 * 3. The name "Carnegie Mellon University" must not be used to 49 * endorse or promote products derived from this software without 50 * prior written permission. For permission or any legal 51 * details, please contact 52 * Office of Technology Transfer 53 * Carnegie Mellon University 54 * 5000 Forbes Avenue 55 * Pittsburgh, PA 15213-3890 56 * (412) 268-4387, fax: (412) 268-7395 57 * tech-transfer@andrew.cmu.edu 58 * 59 * 4. Redistributions of any form whatsoever must retain the following 60 * acknowledgment: 61 * "This product includes software developed by Computing Services 62 * at Carnegie Mellon University (http://www.cmu.edu/computing/)." 63 * 64 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO 65 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 66 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE 67 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 68 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 69 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 70 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 71 */ 72 73 #include <sys/cdefs.h> 74 #if 0 75 #define RCSID "Id: auth.c,v 1.117 2008/07/01 12:27:56 paulus Exp " 76 static const char rcsid[] = RCSID; 77 #else 78 __RCSID("$NetBSD: auth.c,v 1.4 2014/10/25 21:11:37 christos Exp $"); 79 #endif 80 81 #include <stdio.h> 82 #include <stddef.h> 83 #include <stdlib.h> 84 #include <unistd.h> 85 #include <errno.h> 86 #include <pwd.h> 87 #include <grp.h> 88 #include <string.h> 89 #include <sys/types.h> 90 #include <sys/stat.h> 91 #include <sys/socket.h> 92 #include <fcntl.h> 93 #if defined(_PATH_LASTLOG) && defined(__linux__) 94 #include <lastlog.h> 95 #endif 96 97 #include <netdb.h> 98 #include <netinet/in.h> 99 #include <arpa/inet.h> 100 101 102 #ifdef HAS_SHADOW 103 #include <shadow.h> 104 #ifndef PW_PPP 105 #define PW_PPP PW_LOGIN 106 #endif 107 #endif 108 #include <time.h> 109 110 #include "pppd.h" 111 #include "fsm.h" 112 #include "lcp.h" 113 #include "ccp.h" 114 #include "ecp.h" 115 #include "ipcp.h" 116 #include "upap.h" 117 #include "chap-new.h" 118 #include "eap.h" 119 #ifdef CBCP_SUPPORT 120 #include "cbcp.h" 121 #endif 122 #include "pathnames.h" 123 #include "session.h" 124 125 126 /* Bits in scan_authfile return value */ 127 #define NONWILD_SERVER 1 128 #define NONWILD_CLIENT 2 129 130 #define ISWILD(word) (word[0] == '*' && word[1] == 0) 131 132 /* The name by which the peer authenticated itself to us. */ 133 char peer_authname[MAXNAMELEN]; 134 135 /* Records which authentication operations haven't completed yet. */ 136 static int auth_pending[NUM_PPP]; 137 138 /* Records which authentication operations have been completed. */ 139 int auth_done[NUM_PPP]; 140 141 /* List of addresses which the peer may use. */ 142 static struct permitted_ip *addresses[NUM_PPP]; 143 144 /* Wordlist giving addresses which the peer may use 145 without authenticating itself. */ 146 static struct wordlist *noauth_addrs; 147 148 /* Remote telephone number, if available */ 149 char remote_number[MAXNAMELEN]; 150 151 /* Wordlist giving remote telephone numbers which may connect. */ 152 static struct wordlist *permitted_numbers; 153 154 /* Extra options to apply, from the secrets file entry for the peer. */ 155 static struct wordlist *extra_options; 156 157 /* Number of network protocols which we have opened. */ 158 static int num_np_open; 159 160 /* Number of network protocols which have come up. */ 161 static int num_np_up; 162 163 /* Set if we got the contents of passwd[] from the pap-secrets file. */ 164 static int passwd_from_file; 165 166 /* Set if we require authentication only because we have a default route. */ 167 static bool default_auth; 168 169 /* Hook to enable a plugin to control the idle time limit */ 170 int (*idle_time_hook) __P((struct ppp_idle *)) = NULL; 171 172 /* Hook for a plugin to say whether we can possibly authenticate any peer */ 173 int (*pap_check_hook) __P((void)) = NULL; 174 175 /* Hook for a plugin to check the PAP user and password */ 176 int (*pap_auth_hook) __P((char *user, char *passwd, char **msgp, 177 struct wordlist **paddrs, 178 struct wordlist **popts)) = NULL; 179 180 /* Hook for a plugin to know about the PAP user logout */ 181 void (*pap_logout_hook) __P((void)) = NULL; 182 183 /* Hook for a plugin to get the PAP password for authenticating us */ 184 int (*pap_passwd_hook) __P((char *user, char *passwd)) = NULL; 185 186 /* Hook for a plugin to say if we can possibly authenticate a peer using CHAP */ 187 int (*chap_check_hook) __P((void)) = NULL; 188 189 /* Hook for a plugin to get the CHAP password for authenticating us */ 190 int (*chap_passwd_hook) __P((char *user, char *passwd)) = NULL; 191 192 /* Hook for a plugin to say whether it is OK if the peer 193 refuses to authenticate. */ 194 int (*null_auth_hook) __P((struct wordlist **paddrs, 195 struct wordlist **popts)) = NULL; 196 197 int (*allowed_address_hook) __P((u_int32_t addr)) = NULL; 198 199 #ifdef HAVE_MULTILINK 200 /* Hook for plugin to hear when an interface joins a multilink bundle */ 201 void (*multilink_join_hook) __P((void)) = NULL; 202 #endif 203 204 /* A notifier for when the peer has authenticated itself, 205 and we are proceeding to the network phase. */ 206 struct notifier *auth_up_notifier = NULL; 207 208 /* A notifier for when the link goes down. */ 209 struct notifier *link_down_notifier = NULL; 210 211 /* 212 * This is used to ensure that we don't start an auth-up/down 213 * script while one is already running. 214 */ 215 enum script_state { 216 s_down, 217 s_up 218 }; 219 220 static enum script_state auth_state = s_down; 221 static enum script_state auth_script_state = s_down; 222 static pid_t auth_script_pid = 0; 223 224 /* 225 * Option variables. 226 */ 227 bool uselogin = 0; /* Use /etc/passwd for checking PAP */ 228 bool session_mgmt = 0; /* Do session management (login records) */ 229 bool cryptpap = 0; /* Passwords in pap-secrets are encrypted */ 230 bool refuse_pap = 0; /* Don't wanna auth. ourselves with PAP */ 231 bool refuse_chap = 0; /* Don't wanna auth. ourselves with CHAP */ 232 bool refuse_eap = 0; /* Don't wanna auth. ourselves with EAP */ 233 #ifdef CHAPMS 234 bool refuse_mschap = 0; /* Don't wanna auth. ourselves with MS-CHAP */ 235 bool refuse_mschap_v2 = 0; /* Don't wanna auth. ourselves with MS-CHAPv2 */ 236 #else 237 bool refuse_mschap = 1; /* Don't wanna auth. ourselves with MS-CHAP */ 238 bool refuse_mschap_v2 = 1; /* Don't wanna auth. ourselves with MS-CHAPv2 */ 239 #endif 240 bool usehostname = 0; /* Use hostname for our_name */ 241 bool auth_required = 0; /* Always require authentication from peer */ 242 bool allow_any_ip = 0; /* Allow peer to use any IP address */ 243 bool explicit_remote = 0; /* User specified explicit remote name */ 244 bool explicit_user = 0; /* Set if "user" option supplied */ 245 bool explicit_passwd = 0; /* Set if "password" option supplied */ 246 char remote_name[MAXNAMELEN]; /* Peer's name for authentication */ 247 248 static char *uafname; /* name of most recent +ua file */ 249 250 extern char *crypt __P((const char *, const char *)); 251 252 /* Prototypes for procedures local to this file. */ 253 254 static void network_phase __P((int)); 255 static void check_idle __P((void *)); 256 static void connect_time_expired __P((void *)); 257 static int null_login __P((int)); 258 static int get_pap_passwd __P((char *)); 259 static int have_pap_secret __P((int *)); 260 static int have_chap_secret __P((char *, char *, int, int *)); 261 static int have_srp_secret __P((char *client, char *server, int need_ip, 262 int *lacks_ipp)); 263 static int ip_addr_check __P((u_int32_t, struct permitted_ip *)); 264 static int scan_authfile __P((FILE *, char *, char *, char *, 265 struct wordlist **, struct wordlist **, 266 char *, int)); 267 static void free_wordlist __P((struct wordlist *)); 268 static void auth_script __P((char *)); 269 static void auth_script_done __P((void *)); 270 static void set_allowed_addrs __P((int, struct wordlist *, struct wordlist *)); 271 static int some_ip_ok __P((struct wordlist *)); 272 static int setupapfile __P((char **)); 273 static int privgroup __P((char **)); 274 static int set_noauth_addr __P((char **)); 275 static int set_permitted_number __P((char **)); 276 static void check_access __P((FILE *, char *)); 277 static int wordlist_count __P((struct wordlist *)); 278 279 #ifdef MAXOCTETS 280 static void check_maxoctets __P((void *)); 281 #endif 282 283 /* 284 * Authentication-related options. 285 */ 286 option_t auth_options[] = { 287 { "auth", o_bool, &auth_required, 288 "Require authentication from peer", OPT_PRIO | 1 }, 289 { "noauth", o_bool, &auth_required, 290 "Don't require peer to authenticate", OPT_PRIOSUB | OPT_PRIV, 291 &allow_any_ip }, 292 { "require-pap", o_bool, &lcp_wantoptions[0].neg_upap, 293 "Require PAP authentication from peer", 294 OPT_PRIOSUB | 1, &auth_required }, 295 { "+pap", o_bool, &lcp_wantoptions[0].neg_upap, 296 "Require PAP authentication from peer", 297 OPT_ALIAS | OPT_PRIOSUB | 1, &auth_required }, 298 { "require-chap", o_bool, &auth_required, 299 "Require CHAP authentication from peer", 300 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5, 301 &lcp_wantoptions[0].chap_mdtype }, 302 { "+chap", o_bool, &auth_required, 303 "Require CHAP authentication from peer", 304 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5, 305 &lcp_wantoptions[0].chap_mdtype }, 306 #ifdef CHAPMS 307 { "require-mschap", o_bool, &auth_required, 308 "Require MS-CHAP authentication from peer", 309 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT, 310 &lcp_wantoptions[0].chap_mdtype }, 311 { "+mschap", o_bool, &auth_required, 312 "Require MS-CHAP authentication from peer", 313 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT, 314 &lcp_wantoptions[0].chap_mdtype }, 315 { "require-mschap-v2", o_bool, &auth_required, 316 "Require MS-CHAPv2 authentication from peer", 317 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2, 318 &lcp_wantoptions[0].chap_mdtype }, 319 { "+mschap-v2", o_bool, &auth_required, 320 "Require MS-CHAPv2 authentication from peer", 321 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2, 322 &lcp_wantoptions[0].chap_mdtype }, 323 #endif 324 325 { "refuse-pap", o_bool, &refuse_pap, 326 "Don't agree to auth to peer with PAP", 1 }, 327 { "-pap", o_bool, &refuse_pap, 328 "Don't allow PAP authentication with peer", OPT_ALIAS | 1 }, 329 { "refuse-chap", o_bool, &refuse_chap, 330 "Don't agree to auth to peer with CHAP", 331 OPT_A2CLRB | MDTYPE_MD5, 332 &lcp_allowoptions[0].chap_mdtype }, 333 { "-chap", o_bool, &refuse_chap, 334 "Don't allow CHAP authentication with peer", 335 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MD5, 336 &lcp_allowoptions[0].chap_mdtype }, 337 #ifdef CHAPMS 338 { "refuse-mschap", o_bool, &refuse_mschap, 339 "Don't agree to auth to peer with MS-CHAP", 340 OPT_A2CLRB | MDTYPE_MICROSOFT, 341 &lcp_allowoptions[0].chap_mdtype }, 342 { "-mschap", o_bool, &refuse_mschap, 343 "Don't allow MS-CHAP authentication with peer", 344 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT, 345 &lcp_allowoptions[0].chap_mdtype }, 346 { "refuse-mschap-v2", o_bool, &refuse_mschap_v2, 347 "Don't agree to auth to peer with MS-CHAPv2", 348 OPT_A2CLRB | MDTYPE_MICROSOFT_V2, 349 &lcp_allowoptions[0].chap_mdtype }, 350 { "-mschap-v2", o_bool, &refuse_mschap_v2, 351 "Don't allow MS-CHAPv2 authentication with peer", 352 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT_V2, 353 &lcp_allowoptions[0].chap_mdtype }, 354 #endif 355 356 { "require-eap", o_bool, &lcp_wantoptions[0].neg_eap, 357 "Require EAP authentication from peer", OPT_PRIOSUB | 1, 358 &auth_required }, 359 { "refuse-eap", o_bool, &refuse_eap, 360 "Don't agree to authenticate to peer with EAP", 1 }, 361 362 { "name", o_string, our_name, 363 "Set local name for authentication", 364 OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXNAMELEN }, 365 366 { "+ua", o_special, (void *)setupapfile, 367 "Get PAP user and password from file", 368 OPT_PRIO | OPT_A2STRVAL, &uafname }, 369 370 { "user", o_string, user, 371 "Set name for auth with peer", OPT_PRIO | OPT_STATIC, 372 &explicit_user, MAXNAMELEN }, 373 374 { "password", o_string, passwd, 375 "Password for authenticating us to the peer", 376 OPT_PRIO | OPT_STATIC | OPT_HIDE, 377 &explicit_passwd, MAXSECRETLEN }, 378 379 { "usehostname", o_bool, &usehostname, 380 "Must use hostname for authentication", 1 }, 381 382 { "remotename", o_string, remote_name, 383 "Set remote name for authentication", OPT_PRIO | OPT_STATIC, 384 &explicit_remote, MAXNAMELEN }, 385 386 { "login", o_bool, &uselogin, 387 "Use system password database for PAP", OPT_A2COPY | 1 , 388 &session_mgmt }, 389 { "enable-session", o_bool, &session_mgmt, 390 "Enable session accounting for remote peers", OPT_PRIV | 1 }, 391 392 { "papcrypt", o_bool, &cryptpap, 393 "PAP passwords are encrypted", 1 }, 394 395 { "privgroup", o_special, (void *)privgroup, 396 "Allow group members to use privileged options", OPT_PRIV | OPT_A2LIST }, 397 398 { "allow-ip", o_special, (void *)set_noauth_addr, 399 "Set IP address(es) which can be used without authentication", 400 OPT_PRIV | OPT_A2LIST }, 401 402 { "remotenumber", o_string, remote_number, 403 "Set remote telephone number for authentication", OPT_PRIO | OPT_STATIC, 404 NULL, MAXNAMELEN }, 405 406 { "allow-number", o_special, (void *)set_permitted_number, 407 "Set telephone number(s) which are allowed to connect", 408 OPT_PRIV | OPT_A2LIST }, 409 410 { NULL } 411 }; 412 413 /* 414 * setupapfile - specifies UPAP info for authenticating with peer. 415 */ 416 static int 417 setupapfile(argv) 418 char **argv; 419 { 420 FILE *ufile; 421 int l; 422 uid_t euid; 423 char u[MAXNAMELEN], p[MAXSECRETLEN]; 424 425 lcp_allowoptions[0].neg_upap = 1; 426 427 if (*argv == NULL) 428 novm("+ua file name"); 429 430 if (uafname != NULL) 431 free(uafname); 432 /* open user info file */ 433 uafname = strdup(*argv); 434 if (uafname == NULL) 435 novm("+ua file name"); 436 euid = geteuid(); 437 if (seteuid(getuid()) == -1) { 438 option_error("unable to reset uid before opening %s: %m", uafname); 439 return 0; 440 } 441 ufile = fopen(uafname, "r"); 442 if (seteuid(euid) == -1) 443 fatal("unable to regain privileges: %m"); 444 if (ufile == NULL) { 445 option_error("unable to open user login data file %s", uafname); 446 return 0; 447 } 448 check_access(ufile, uafname); 449 450 /* get username */ 451 if (fgets(u, MAXNAMELEN - 1, ufile) == NULL 452 || fgets(p, MAXSECRETLEN - 1, ufile) == NULL) { 453 fclose(ufile); 454 option_error("unable to read user login data file %s", uafname); 455 return 0; 456 } 457 fclose(ufile); 458 459 /* get rid of newlines */ 460 l = strlen(u); 461 if (l > 0 && u[l-1] == '\n') 462 u[l-1] = 0; 463 l = strlen(p); 464 if (l > 0 && p[l-1] == '\n') 465 p[l-1] = 0; 466 467 if (override_value("user", option_priority, uafname)) { 468 strlcpy(user, u, sizeof(user)); 469 explicit_user = 1; 470 } 471 if (override_value("passwd", option_priority, uafname)) { 472 strlcpy(passwd, p, sizeof(passwd)); 473 explicit_passwd = 1; 474 } 475 476 return (1); 477 } 478 479 480 /* 481 * privgroup - allow members of the group to have privileged access. 482 */ 483 static int 484 privgroup(argv) 485 char **argv; 486 { 487 struct group *g; 488 int i; 489 490 g = getgrnam(*argv); 491 if (g == 0) { 492 option_error("group %s is unknown", *argv); 493 return 0; 494 } 495 for (i = 0; i < ngroups; ++i) { 496 if (groups[i] == g->gr_gid) { 497 privileged = 1; 498 break; 499 } 500 } 501 return 1; 502 } 503 504 505 /* 506 * set_noauth_addr - set address(es) that can be used without authentication. 507 * Equivalent to specifying an entry like `"" * "" addr' in pap-secrets. 508 */ 509 static int 510 set_noauth_addr(argv) 511 char **argv; 512 { 513 char *addr = *argv; 514 int l = strlen(addr) + 1; 515 struct wordlist *wp; 516 517 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l); 518 if (wp == NULL) 519 novm("allow-ip argument"); 520 wp->word = (char *) (wp + 1); 521 wp->next = noauth_addrs; 522 BCOPY(addr, wp->word, l); 523 noauth_addrs = wp; 524 return 1; 525 } 526 527 528 /* 529 * set_permitted_number - set remote telephone number(s) that may connect. 530 */ 531 static int 532 set_permitted_number(argv) 533 char **argv; 534 { 535 char *number = *argv; 536 int l = strlen(number) + 1; 537 struct wordlist *wp; 538 539 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l); 540 if (wp == NULL) 541 novm("allow-number argument"); 542 wp->word = (char *) (wp + 1); 543 wp->next = permitted_numbers; 544 BCOPY(number, wp->word, l); 545 permitted_numbers = wp; 546 return 1; 547 } 548 549 550 /* 551 * An Open on LCP has requested a change from Dead to Establish phase. 552 */ 553 void 554 link_required(unit) 555 int unit; 556 { 557 } 558 559 /* 560 * Bring the link up to the point of being able to do ppp. 561 */ 562 void start_link(unit) 563 int unit; 564 { 565 status = EXIT_CONNECT_FAILED; 566 new_phase(PHASE_SERIALCONN); 567 568 hungup = 0; 569 devfd = the_channel->connect(); 570 if (devfd < 0) 571 goto fail; 572 573 /* set up the serial device as a ppp interface */ 574 /* 575 * N.B. we used to do tdb_writelock/tdb_writeunlock around this 576 * (from establish_ppp to set_ifunit). However, we won't be 577 * doing the set_ifunit in multilink mode, which is the only time 578 * we need the atomicity that the tdb_writelock/tdb_writeunlock 579 * gives us. Thus we don't need the tdb_writelock/tdb_writeunlock. 580 */ 581 fd_ppp = the_channel->establish_ppp(devfd); 582 if (fd_ppp < 0) { 583 status = EXIT_FATAL_ERROR; 584 goto disconnect; 585 } 586 587 if (!demand && ifunit >= 0) 588 set_ifunit(1); 589 590 /* 591 * Start opening the connection and wait for 592 * incoming events (reply, timeout, etc.). 593 */ 594 if (ifunit >= 0) 595 notice("Connect: %s <--> %s", ifname, ppp_devnam); 596 else 597 notice("Starting negotiation on %s", ppp_devnam); 598 add_fd(fd_ppp); 599 600 status = EXIT_NEGOTIATION_FAILED; 601 new_phase(PHASE_ESTABLISH); 602 603 lcp_lowerup(0); 604 return; 605 606 disconnect: 607 new_phase(PHASE_DISCONNECT); 608 if (the_channel->disconnect) 609 the_channel->disconnect(); 610 611 fail: 612 new_phase(PHASE_DEAD); 613 if (the_channel->cleanup) 614 (*the_channel->cleanup)(); 615 } 616 617 /* 618 * LCP has terminated the link; go to the Dead phase and take the 619 * physical layer down. 620 */ 621 void 622 link_terminated(unit) 623 int unit; 624 { 625 if (phase == PHASE_DEAD || phase == PHASE_MASTER) 626 return; 627 new_phase(PHASE_DISCONNECT); 628 629 if (pap_logout_hook) { 630 pap_logout_hook(); 631 } 632 session_end(devnam); 633 634 if (!doing_multilink) { 635 notice("Connection terminated."); 636 print_link_stats(); 637 } else 638 notice("Link terminated."); 639 640 /* 641 * Delete pid files before disestablishing ppp. Otherwise it 642 * can happen that another pppd gets the same unit and then 643 * we delete its pid file. 644 */ 645 if (!doing_multilink && !demand) 646 remove_pidfiles(); 647 648 /* 649 * If we may want to bring the link up again, transfer 650 * the ppp unit back to the loopback. Set the 651 * real serial device back to its normal mode of operation. 652 */ 653 if (fd_ppp >= 0) { 654 remove_fd(fd_ppp); 655 clean_check(); 656 the_channel->disestablish_ppp(devfd); 657 if (doing_multilink) 658 mp_exit_bundle(); 659 fd_ppp = -1; 660 } 661 if (!hungup) 662 lcp_lowerdown(0); 663 if (!doing_multilink && !demand) 664 script_unsetenv("IFNAME"); 665 666 /* 667 * Run disconnector script, if requested. 668 * XXX we may not be able to do this if the line has hung up! 669 */ 670 if (devfd >= 0 && the_channel->disconnect) { 671 the_channel->disconnect(); 672 devfd = -1; 673 } 674 if (the_channel->cleanup) 675 (*the_channel->cleanup)(); 676 677 if (doing_multilink && multilink_master) { 678 if (!bundle_terminating) { 679 new_phase(PHASE_MASTER); 680 if (master_detach && !detached) 681 detach(); 682 } else 683 mp_bundle_terminated(); 684 } else 685 new_phase(PHASE_DEAD); 686 } 687 688 /* 689 * LCP has gone down; it will either die or try to re-establish. 690 */ 691 void 692 link_down(unit) 693 int unit; 694 { 695 if (auth_state != s_down) { 696 notify(link_down_notifier, 0); 697 auth_state = s_down; 698 if (auth_script_state == s_up && auth_script_pid == 0) { 699 update_link_stats(unit); 700 auth_script_state = s_down; 701 auth_script(_PATH_AUTHDOWN); 702 } 703 } 704 if (!doing_multilink) { 705 upper_layers_down(unit); 706 if (phase != PHASE_DEAD && phase != PHASE_MASTER) 707 new_phase(PHASE_ESTABLISH); 708 } 709 /* XXX if doing_multilink, should do something to stop 710 network-layer traffic on the link */ 711 } 712 713 void upper_layers_down(int unit) 714 { 715 int i; 716 struct protent *protp; 717 718 for (i = 0; (protp = protocols[i]) != NULL; ++i) { 719 if (!protp->enabled_flag) 720 continue; 721 if (protp->protocol != PPP_LCP && protp->lowerdown != NULL) 722 (*protp->lowerdown)(unit); 723 if (protp->protocol < 0xC000 && protp->close != NULL) 724 (*protp->close)(unit, "LCP down"); 725 } 726 num_np_open = 0; 727 num_np_up = 0; 728 } 729 730 /* 731 * The link is established. 732 * Proceed to the Dead, Authenticate or Network phase as appropriate. 733 */ 734 void 735 link_established(unit) 736 int unit; 737 { 738 int auth; 739 lcp_options *wo = &lcp_wantoptions[unit]; 740 lcp_options *go = &lcp_gotoptions[unit]; 741 lcp_options *ho = &lcp_hisoptions[unit]; 742 int i; 743 struct protent *protp; 744 745 /* 746 * Tell higher-level protocols that LCP is up. 747 */ 748 if (!doing_multilink) { 749 for (i = 0; (protp = protocols[i]) != NULL; ++i) 750 if (protp->protocol != PPP_LCP && protp->enabled_flag 751 && protp->lowerup != NULL) 752 (*protp->lowerup)(unit); 753 } 754 755 if (!auth_required && noauth_addrs != NULL) 756 set_allowed_addrs(unit, NULL, NULL); 757 758 if (auth_required && !(go->neg_upap || go->neg_chap || go->neg_eap)) { 759 /* 760 * We wanted the peer to authenticate itself, and it refused: 761 * if we have some address(es) it can use without auth, fine, 762 * otherwise treat it as though it authenticated with PAP using 763 * a username of "" and a password of "". If that's not OK, 764 * boot it out. 765 */ 766 if (noauth_addrs != NULL) { 767 set_allowed_addrs(unit, NULL, NULL); 768 } else if (!wo->neg_upap || uselogin || !null_login(unit)) { 769 warn("peer refused to authenticate: terminating link"); 770 status = EXIT_PEER_AUTH_FAILED; 771 lcp_close(unit, "peer refused to authenticate"); 772 return; 773 } 774 } 775 776 new_phase(PHASE_AUTHENTICATE); 777 auth = 0; 778 if (go->neg_eap) { 779 eap_authpeer(unit, our_name); 780 auth |= EAP_PEER; 781 } else if (go->neg_chap) { 782 chap_auth_peer(unit, our_name, CHAP_DIGEST(go->chap_mdtype)); 783 auth |= CHAP_PEER; 784 } else if (go->neg_upap) { 785 upap_authpeer(unit); 786 auth |= PAP_PEER; 787 } 788 if (ho->neg_eap) { 789 eap_authwithpeer(unit, user); 790 auth |= EAP_WITHPEER; 791 } else if (ho->neg_chap) { 792 chap_auth_with_peer(unit, user, CHAP_DIGEST(ho->chap_mdtype)); 793 auth |= CHAP_WITHPEER; 794 } else if (ho->neg_upap) { 795 /* If a blank password was explicitly given as an option, trust 796 the user and don't try to look up one. */ 797 if (passwd[0] == 0 && !explicit_passwd) { 798 passwd_from_file = 1; 799 if (!get_pap_passwd(passwd)) 800 error("No secret found for PAP login"); 801 } 802 upap_authwithpeer(unit, user, passwd); 803 auth |= PAP_WITHPEER; 804 } 805 auth_pending[unit] = auth; 806 auth_done[unit] = 0; 807 808 if (!auth) 809 network_phase(unit); 810 } 811 812 /* 813 * Proceed to the network phase. 814 */ 815 static void 816 network_phase(unit) 817 int unit; 818 { 819 lcp_options *go = &lcp_gotoptions[unit]; 820 821 /* Log calling number. */ 822 if (*remote_number) 823 notice("peer from calling number %q authorized", remote_number); 824 825 /* 826 * If the peer had to authenticate, run the auth-up script now. 827 */ 828 if (go->neg_chap || go->neg_upap || go->neg_eap) { 829 notify(auth_up_notifier, 0); 830 auth_state = s_up; 831 if (auth_script_state == s_down && auth_script_pid == 0) { 832 auth_script_state = s_up; 833 auth_script(_PATH_AUTHUP); 834 } 835 } 836 837 #ifdef CBCP_SUPPORT 838 /* 839 * If we negotiated callback, do it now. 840 */ 841 if (go->neg_cbcp) { 842 new_phase(PHASE_CALLBACK); 843 (*cbcp_protent.open)(unit); 844 return; 845 } 846 #endif 847 848 /* 849 * Process extra options from the secrets file 850 */ 851 if (extra_options) { 852 options_from_list(extra_options, 1); 853 free_wordlist(extra_options); 854 extra_options = 0; 855 } 856 start_networks(unit); 857 } 858 859 void 860 start_networks(unit) 861 int unit; 862 { 863 int i; 864 struct protent *protp; 865 int ecp_required, mppe_required; 866 867 new_phase(PHASE_NETWORK); 868 869 #ifdef HAVE_MULTILINK 870 if (multilink) { 871 if (mp_join_bundle()) { 872 if (multilink_join_hook) 873 (*multilink_join_hook)(); 874 if (updetach && !nodetach) 875 detach(); 876 return; 877 } 878 } 879 #endif /* HAVE_MULTILINK */ 880 881 #ifdef PPP_FILTER 882 if (!demand) 883 set_filters(&pass_filter_in, &pass_filter_out, 884 &active_filter_in, &active_filter_out); 885 #endif 886 /* Start CCP and ECP */ 887 for (i = 0; (protp = protocols[i]) != NULL; ++i) 888 if ((protp->protocol == PPP_ECP || protp->protocol == PPP_CCP) 889 && protp->enabled_flag && protp->open != NULL) 890 (*protp->open)(0); 891 892 /* 893 * Bring up other network protocols iff encryption is not required. 894 */ 895 ecp_required = ecp_gotoptions[unit].required; 896 mppe_required = ccp_gotoptions[unit].mppe; 897 if (!ecp_required && !mppe_required) 898 continue_networks(unit); 899 } 900 901 void 902 continue_networks(unit) 903 int unit; 904 { 905 int i; 906 struct protent *protp; 907 908 /* 909 * Start the "real" network protocols. 910 */ 911 for (i = 0; (protp = protocols[i]) != NULL; ++i) 912 if (protp->protocol < 0xC000 913 && protp->protocol != PPP_CCP && protp->protocol != PPP_ECP 914 && protp->enabled_flag && protp->open != NULL) { 915 (*protp->open)(0); 916 ++num_np_open; 917 } 918 919 if (num_np_open == 0) 920 /* nothing to do */ 921 lcp_close(0, "No network protocols running"); 922 } 923 924 /* 925 * The peer has failed to authenticate himself using `protocol'. 926 */ 927 void 928 auth_peer_fail(unit, protocol) 929 int unit, protocol; 930 { 931 /* 932 * Authentication failure: take the link down 933 */ 934 status = EXIT_PEER_AUTH_FAILED; 935 lcp_close(unit, "Authentication failed"); 936 } 937 938 /* 939 * The peer has been successfully authenticated using `protocol'. 940 */ 941 void 942 auth_peer_success(unit, protocol, prot_flavor, name, namelen) 943 int unit, protocol, prot_flavor; 944 char *name; 945 int namelen; 946 { 947 int bit; 948 949 switch (protocol) { 950 case PPP_CHAP: 951 bit = CHAP_PEER; 952 switch (prot_flavor) { 953 case CHAP_MD5: 954 bit |= CHAP_MD5_PEER; 955 break; 956 #ifdef CHAPMS 957 case CHAP_MICROSOFT: 958 bit |= CHAP_MS_PEER; 959 break; 960 case CHAP_MICROSOFT_V2: 961 bit |= CHAP_MS2_PEER; 962 break; 963 #endif 964 } 965 break; 966 case PPP_PAP: 967 bit = PAP_PEER; 968 break; 969 case PPP_EAP: 970 bit = EAP_PEER; 971 break; 972 default: 973 warn("auth_peer_success: unknown protocol %x", protocol); 974 return; 975 } 976 977 /* 978 * Save the authenticated name of the peer for later. 979 */ 980 if (namelen > sizeof(peer_authname) - 1) 981 namelen = sizeof(peer_authname) - 1; 982 BCOPY(name, peer_authname, namelen); 983 peer_authname[namelen] = 0; 984 script_setenv("PEERNAME", peer_authname, 0); 985 986 /* Save the authentication method for later. */ 987 auth_done[unit] |= bit; 988 989 /* 990 * If there is no more authentication still to be done, 991 * proceed to the network (or callback) phase. 992 */ 993 if ((auth_pending[unit] &= ~bit) == 0) 994 network_phase(unit); 995 } 996 997 /* 998 * We have failed to authenticate ourselves to the peer using `protocol'. 999 */ 1000 void 1001 auth_withpeer_fail(unit, protocol) 1002 int unit, protocol; 1003 { 1004 if (passwd_from_file) 1005 BZERO(passwd, MAXSECRETLEN); 1006 /* 1007 * We've failed to authenticate ourselves to our peer. 1008 * Some servers keep sending CHAP challenges, but there 1009 * is no point in persisting without any way to get updated 1010 * authentication secrets. 1011 */ 1012 status = EXIT_AUTH_TOPEER_FAILED; 1013 lcp_close(unit, "Failed to authenticate ourselves to peer"); 1014 } 1015 1016 /* 1017 * We have successfully authenticated ourselves with the peer using `protocol'. 1018 */ 1019 void 1020 auth_withpeer_success(unit, protocol, prot_flavor) 1021 int unit, protocol, prot_flavor; 1022 { 1023 int bit; 1024 const char *prot = ""; 1025 1026 switch (protocol) { 1027 case PPP_CHAP: 1028 bit = CHAP_WITHPEER; 1029 prot = "CHAP"; 1030 switch (prot_flavor) { 1031 case CHAP_MD5: 1032 bit |= CHAP_MD5_WITHPEER; 1033 break; 1034 #ifdef CHAPMS 1035 case CHAP_MICROSOFT: 1036 bit |= CHAP_MS_WITHPEER; 1037 break; 1038 case CHAP_MICROSOFT_V2: 1039 bit |= CHAP_MS2_WITHPEER; 1040 break; 1041 #endif 1042 } 1043 break; 1044 case PPP_PAP: 1045 if (passwd_from_file) 1046 BZERO(passwd, MAXSECRETLEN); 1047 bit = PAP_WITHPEER; 1048 prot = "PAP"; 1049 break; 1050 case PPP_EAP: 1051 bit = EAP_WITHPEER; 1052 prot = "EAP"; 1053 break; 1054 default: 1055 warn("auth_withpeer_success: unknown protocol %x", protocol); 1056 bit = 0; 1057 } 1058 1059 notice("%s authentication succeeded", prot); 1060 1061 /* Save the authentication method for later. */ 1062 auth_done[unit] |= bit; 1063 1064 /* 1065 * If there is no more authentication still being done, 1066 * proceed to the network (or callback) phase. 1067 */ 1068 if ((auth_pending[unit] &= ~bit) == 0) 1069 network_phase(unit); 1070 } 1071 1072 1073 /* 1074 * np_up - a network protocol has come up. 1075 */ 1076 void 1077 np_up(unit, proto) 1078 int unit, proto; 1079 { 1080 int tlim; 1081 1082 if (num_np_up == 0) { 1083 /* 1084 * At this point we consider that the link has come up successfully. 1085 */ 1086 status = EXIT_OK; 1087 unsuccess = 0; 1088 new_phase(PHASE_RUNNING); 1089 1090 if (idle_time_hook != 0) 1091 tlim = (*idle_time_hook)(NULL); 1092 else 1093 tlim = idle_time_limit; 1094 if (tlim > 0) 1095 TIMEOUT(check_idle, NULL, tlim); 1096 1097 /* 1098 * Set a timeout to close the connection once the maximum 1099 * connect time has expired. 1100 */ 1101 if (maxconnect > 0) 1102 TIMEOUT(connect_time_expired, 0, maxconnect); 1103 1104 #ifdef MAXOCTETS 1105 if (maxoctets > 0) 1106 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout); 1107 #endif 1108 1109 /* 1110 * Detach now, if the updetach option was given. 1111 */ 1112 if (updetach && !nodetach) 1113 detach(); 1114 } 1115 ++num_np_up; 1116 } 1117 1118 /* 1119 * np_down - a network protocol has gone down. 1120 */ 1121 void 1122 np_down(unit, proto) 1123 int unit, proto; 1124 { 1125 if (--num_np_up == 0) { 1126 UNTIMEOUT(check_idle, NULL); 1127 UNTIMEOUT(connect_time_expired, NULL); 1128 #ifdef MAXOCTETS 1129 UNTIMEOUT(check_maxoctets, NULL); 1130 #endif 1131 new_phase(PHASE_NETWORK); 1132 } 1133 } 1134 1135 /* 1136 * np_finished - a network protocol has finished using the link. 1137 */ 1138 void 1139 np_finished(unit, proto) 1140 int unit, proto; 1141 { 1142 if (--num_np_open <= 0) { 1143 /* no further use for the link: shut up shop. */ 1144 lcp_close(0, "No network protocols running"); 1145 } 1146 } 1147 1148 #ifdef MAXOCTETS 1149 static void 1150 check_maxoctets(arg) 1151 void *arg; 1152 { 1153 unsigned int used; 1154 1155 update_link_stats(ifunit); 1156 link_stats_valid=0; 1157 1158 switch(maxoctets_dir) { 1159 case PPP_OCTETS_DIRECTION_IN: 1160 used = link_stats.bytes_in; 1161 break; 1162 case PPP_OCTETS_DIRECTION_OUT: 1163 used = link_stats.bytes_out; 1164 break; 1165 case PPP_OCTETS_DIRECTION_MAXOVERAL: 1166 case PPP_OCTETS_DIRECTION_MAXSESSION: 1167 used = (link_stats.bytes_in > link_stats.bytes_out) ? link_stats.bytes_in : link_stats.bytes_out; 1168 break; 1169 default: 1170 used = link_stats.bytes_in+link_stats.bytes_out; 1171 break; 1172 } 1173 if (used > maxoctets) { 1174 notice("Traffic limit reached. Limit: %u Used: %u", maxoctets, used); 1175 status = EXIT_TRAFFIC_LIMIT; 1176 lcp_close(0, "Traffic limit"); 1177 need_holdoff = 0; 1178 } else { 1179 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout); 1180 } 1181 } 1182 #endif 1183 1184 /* 1185 * check_idle - check whether the link has been idle for long 1186 * enough that we can shut it down. 1187 */ 1188 static void 1189 check_idle(arg) 1190 void *arg; 1191 { 1192 struct ppp_idle idle; 1193 time_t itime; 1194 int tlim; 1195 1196 if (!get_idle_time(0, &idle)) 1197 return; 1198 if (idle_time_hook != 0) { 1199 tlim = idle_time_hook(&idle); 1200 } else { 1201 itime = MIN(idle.xmit_idle, idle.recv_idle); 1202 tlim = idle_time_limit - itime; 1203 } 1204 if (tlim <= 0) { 1205 /* link is idle: shut it down. */ 1206 notice("Terminating connection due to lack of activity."); 1207 status = EXIT_IDLE_TIMEOUT; 1208 lcp_close(0, "Link inactive"); 1209 need_holdoff = 0; 1210 } else { 1211 TIMEOUT(check_idle, NULL, tlim); 1212 } 1213 } 1214 1215 /* 1216 * connect_time_expired - log a message and close the connection. 1217 */ 1218 static void 1219 connect_time_expired(arg) 1220 void *arg; 1221 { 1222 info("Connect time expired"); 1223 status = EXIT_CONNECT_TIME; 1224 lcp_close(0, "Connect time expired"); /* Close connection */ 1225 } 1226 1227 /* 1228 * auth_check_options - called to check authentication options. 1229 */ 1230 void 1231 auth_check_options() 1232 { 1233 lcp_options *wo = &lcp_wantoptions[0]; 1234 int can_auth; 1235 int lacks_ip; 1236 1237 /* Default our_name to hostname, and user to our_name */ 1238 if (our_name[0] == 0 || usehostname) 1239 strlcpy(our_name, hostname, sizeof(our_name)); 1240 /* If a blank username was explicitly given as an option, trust 1241 the user and don't use our_name */ 1242 if (user[0] == 0 && !explicit_user) 1243 strlcpy(user, our_name, sizeof(user)); 1244 1245 /* 1246 * If we have a default route, require the peer to authenticate 1247 * unless the noauth option was given or the real user is root. 1248 */ 1249 if (!auth_required && !allow_any_ip && have_route_to(0) && !privileged) { 1250 auth_required = 1; 1251 default_auth = 1; 1252 } 1253 1254 /* If we selected any CHAP flavors, we should probably negotiate it. :-) */ 1255 if (wo->chap_mdtype) 1256 wo->neg_chap = 1; 1257 1258 /* If authentication is required, ask peer for CHAP, PAP, or EAP. */ 1259 if (auth_required) { 1260 allow_any_ip = 0; 1261 if (!wo->neg_chap && !wo->neg_upap && !wo->neg_eap) { 1262 wo->neg_chap = chap_mdtype_all != MDTYPE_NONE; 1263 wo->chap_mdtype = chap_mdtype_all; 1264 wo->neg_upap = 1; 1265 wo->neg_eap = 1; 1266 } 1267 } else { 1268 wo->neg_chap = 0; 1269 wo->chap_mdtype = MDTYPE_NONE; 1270 wo->neg_upap = 0; 1271 wo->neg_eap = 0; 1272 } 1273 1274 /* 1275 * Check whether we have appropriate secrets to use 1276 * to authenticate the peer. Note that EAP can authenticate by way 1277 * of a CHAP-like exchanges as well as SRP. 1278 */ 1279 lacks_ip = 0; 1280 can_auth = wo->neg_upap && (uselogin || have_pap_secret(&lacks_ip)); 1281 if (!can_auth && (wo->neg_chap || wo->neg_eap)) { 1282 can_auth = have_chap_secret((explicit_remote? remote_name: NULL), 1283 our_name, 1, &lacks_ip); 1284 } 1285 if (!can_auth && wo->neg_eap) { 1286 can_auth = have_srp_secret((explicit_remote? remote_name: NULL), 1287 our_name, 1, &lacks_ip); 1288 } 1289 1290 if (auth_required && !can_auth && noauth_addrs == NULL) { 1291 if (default_auth) { 1292 option_error( 1293 "By default the remote system is required to authenticate itself"); 1294 option_error( 1295 "(because this system has a default route to the internet)"); 1296 } else if (explicit_remote) 1297 option_error( 1298 "The remote system (%s) is required to authenticate itself", 1299 remote_name); 1300 else 1301 option_error( 1302 "The remote system is required to authenticate itself"); 1303 option_error( 1304 "but I couldn't find any suitable secret (password) for it to use to do so."); 1305 if (lacks_ip) 1306 option_error( 1307 "(None of the available passwords would let it use an IP address.)"); 1308 1309 exit(1); 1310 } 1311 1312 /* 1313 * Early check for remote number authorization. 1314 */ 1315 if (!auth_number()) { 1316 warn("calling number %q is not authorized", remote_number); 1317 exit(EXIT_CNID_AUTH_FAILED); 1318 } 1319 } 1320 1321 /* 1322 * auth_reset - called when LCP is starting negotiations to recheck 1323 * authentication options, i.e. whether we have appropriate secrets 1324 * to use for authenticating ourselves and/or the peer. 1325 */ 1326 void 1327 auth_reset(unit) 1328 int unit; 1329 { 1330 lcp_options *go = &lcp_gotoptions[unit]; 1331 lcp_options *ao = &lcp_allowoptions[unit]; 1332 int hadchap; 1333 1334 hadchap = -1; 1335 ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL)); 1336 ao->neg_chap = (!refuse_chap || !refuse_mschap || !refuse_mschap_v2) 1337 && (passwd[0] != 0 || 1338 (hadchap = have_chap_secret(user, (explicit_remote? remote_name: 1339 NULL), 0, NULL))); 1340 ao->neg_eap = !refuse_eap && ( 1341 passwd[0] != 0 || 1342 (hadchap == 1 || (hadchap == -1 && have_chap_secret(user, 1343 (explicit_remote? remote_name: NULL), 0, NULL))) || 1344 have_srp_secret(user, (explicit_remote? remote_name: NULL), 0, NULL)); 1345 1346 hadchap = -1; 1347 if (go->neg_upap && !uselogin && !have_pap_secret(NULL)) 1348 go->neg_upap = 0; 1349 if (go->neg_chap) { 1350 if (!(hadchap = have_chap_secret((explicit_remote? remote_name: NULL), 1351 our_name, 1, NULL))) 1352 go->neg_chap = 0; 1353 } 1354 if (go->neg_eap && 1355 (hadchap == 0 || (hadchap == -1 && 1356 !have_chap_secret((explicit_remote? remote_name: NULL), our_name, 1357 1, NULL))) && 1358 !have_srp_secret((explicit_remote? remote_name: NULL), our_name, 1, 1359 NULL)) 1360 go->neg_eap = 0; 1361 } 1362 1363 1364 /* 1365 * check_passwd - Check the user name and passwd against the PAP secrets 1366 * file. If requested, also check against the system password database, 1367 * and login the user if OK. 1368 * 1369 * returns: 1370 * UPAP_AUTHNAK: Authentication failed. 1371 * UPAP_AUTHACK: Authentication succeeded. 1372 * In either case, msg points to an appropriate message. 1373 */ 1374 int 1375 check_passwd(unit, auser, userlen, apasswd, passwdlen, msg) 1376 int unit; 1377 char *auser; 1378 int userlen; 1379 char *apasswd; 1380 int passwdlen; 1381 char **msg; 1382 { 1383 int ret; 1384 char *filename; 1385 FILE *f; 1386 struct wordlist *addrs = NULL, *opts = NULL; 1387 char passwd[256], user[256]; 1388 char secret[MAXWORDLEN]; 1389 static int attempts = 0; 1390 1391 /* 1392 * Make copies of apasswd and auser, then null-terminate them. 1393 * If there are unprintable characters in the password, make 1394 * them visible. 1395 */ 1396 slprintf(passwd, sizeof(passwd), "%.*v", passwdlen, apasswd); 1397 slprintf(user, sizeof(user), "%.*v", userlen, auser); 1398 *msg = ""; 1399 1400 /* 1401 * Check if a plugin wants to handle this. 1402 */ 1403 if (pap_auth_hook) { 1404 ret = (*pap_auth_hook)(user, passwd, msg, &addrs, &opts); 1405 if (ret >= 0) { 1406 /* note: set_allowed_addrs() saves opts (but not addrs): 1407 don't free it! */ 1408 if (ret) 1409 set_allowed_addrs(unit, addrs, opts); 1410 else if (opts != 0) 1411 free_wordlist(opts); 1412 if (addrs != 0) 1413 free_wordlist(addrs); 1414 BZERO(passwd, sizeof(passwd)); 1415 return ret? UPAP_AUTHACK: UPAP_AUTHNAK; 1416 } 1417 } 1418 1419 /* 1420 * Open the file of pap secrets and scan for a suitable secret 1421 * for authenticating this user. 1422 */ 1423 filename = _PATH_UPAPFILE; 1424 addrs = opts = NULL; 1425 ret = UPAP_AUTHNAK; 1426 f = fopen(filename, "r"); 1427 if (f == NULL) { 1428 error("Can't open PAP password file %s: %m", filename); 1429 1430 } else { 1431 check_access(f, filename); 1432 if (scan_authfile(f, user, our_name, secret, &addrs, &opts, filename, 0) < 0) { 1433 warn("no PAP secret found for %s", user); 1434 } else { 1435 /* 1436 * If the secret is "@login", it means to check 1437 * the password against the login database. 1438 */ 1439 int login_secret = strcmp(secret, "@login") == 0; 1440 ret = UPAP_AUTHACK; 1441 if (uselogin || login_secret) { 1442 /* login option or secret is @login */ 1443 if (session_full(user, passwd, devnam, msg) == 0) { 1444 ret = UPAP_AUTHNAK; 1445 } 1446 } else if (session_mgmt) { 1447 if (session_check(user, NULL, devnam, NULL) == 0) { 1448 warn("Peer %q failed PAP Session verification", user); 1449 ret = UPAP_AUTHNAK; 1450 } 1451 } 1452 if (secret[0] != 0 && !login_secret) { 1453 /* password given in pap-secrets - must match */ 1454 if (cryptpap || strcmp(passwd, secret) != 0) { 1455 char *cbuf = crypt(passwd, secret); 1456 if (!cbuf || strcmp(cbuf, secret) != 0) 1457 ret = UPAP_AUTHNAK; 1458 } 1459 } 1460 } 1461 fclose(f); 1462 } 1463 1464 if (ret == UPAP_AUTHNAK) { 1465 if (**msg == 0) 1466 *msg = "Login incorrect"; 1467 /* 1468 * XXX can we ever get here more than once?? 1469 * Frustrate passwd stealer programs. 1470 * Allow 10 tries, but start backing off after 3 (stolen from login). 1471 * On 10'th, drop the connection. 1472 */ 1473 if (attempts++ >= 10) { 1474 warn("%d LOGIN FAILURES ON %s, %s", attempts, devnam, user); 1475 lcp_close(unit, "login failed"); 1476 } 1477 if (attempts > 3) 1478 sleep((u_int) (attempts - 3) * 5); 1479 if (opts != NULL) 1480 free_wordlist(opts); 1481 1482 } else { 1483 attempts = 0; /* Reset count */ 1484 if (**msg == 0) 1485 *msg = "Login ok"; 1486 set_allowed_addrs(unit, addrs, opts); 1487 } 1488 1489 if (addrs != NULL) 1490 free_wordlist(addrs); 1491 BZERO(passwd, sizeof(passwd)); 1492 BZERO(secret, sizeof(secret)); 1493 1494 return ret; 1495 } 1496 1497 /* 1498 * null_login - Check if a username of "" and a password of "" are 1499 * acceptable, and iff so, set the list of acceptable IP addresses 1500 * and return 1. 1501 */ 1502 static int 1503 null_login(unit) 1504 int unit; 1505 { 1506 char *filename; 1507 FILE *f; 1508 int i, ret; 1509 struct wordlist *addrs, *opts; 1510 char secret[MAXWORDLEN]; 1511 1512 /* 1513 * Check if a plugin wants to handle this. 1514 */ 1515 ret = -1; 1516 if (null_auth_hook) 1517 ret = (*null_auth_hook)(&addrs, &opts); 1518 1519 /* 1520 * Open the file of pap secrets and scan for a suitable secret. 1521 */ 1522 if (ret <= 0) { 1523 filename = _PATH_UPAPFILE; 1524 addrs = NULL; 1525 f = fopen(filename, "r"); 1526 if (f == NULL) 1527 return 0; 1528 check_access(f, filename); 1529 1530 i = scan_authfile(f, "", our_name, secret, &addrs, &opts, filename, 0); 1531 ret = i >= 0 && secret[0] == 0; 1532 BZERO(secret, sizeof(secret)); 1533 fclose(f); 1534 } 1535 1536 if (ret) 1537 set_allowed_addrs(unit, addrs, opts); 1538 else if (opts != 0) 1539 free_wordlist(opts); 1540 if (addrs != 0) 1541 free_wordlist(addrs); 1542 1543 return ret; 1544 } 1545 1546 1547 /* 1548 * get_pap_passwd - get a password for authenticating ourselves with 1549 * our peer using PAP. Returns 1 on success, 0 if no suitable password 1550 * could be found. 1551 * Assumes passwd points to MAXSECRETLEN bytes of space (if non-null). 1552 */ 1553 static int 1554 get_pap_passwd(passwd) 1555 char *passwd; 1556 { 1557 char *filename; 1558 FILE *f; 1559 int ret; 1560 char secret[MAXWORDLEN]; 1561 1562 /* 1563 * Check whether a plugin wants to supply this. 1564 */ 1565 if (pap_passwd_hook) { 1566 ret = (*pap_passwd_hook)(user, passwd); 1567 if (ret >= 0) 1568 return ret; 1569 } 1570 1571 filename = _PATH_UPAPFILE; 1572 f = fopen(filename, "r"); 1573 if (f == NULL) 1574 return 0; 1575 check_access(f, filename); 1576 ret = scan_authfile(f, user, 1577 (remote_name[0]? remote_name: NULL), 1578 secret, NULL, NULL, filename, 0); 1579 fclose(f); 1580 if (ret < 0) 1581 return 0; 1582 if (passwd != NULL) 1583 strlcpy(passwd, secret, MAXSECRETLEN); 1584 BZERO(secret, sizeof(secret)); 1585 return 1; 1586 } 1587 1588 1589 /* 1590 * have_pap_secret - check whether we have a PAP file with any 1591 * secrets that we could possibly use for authenticating the peer. 1592 */ 1593 static int 1594 have_pap_secret(lacks_ipp) 1595 int *lacks_ipp; 1596 { 1597 FILE *f; 1598 int ret; 1599 char *filename; 1600 struct wordlist *addrs; 1601 1602 /* let the plugin decide, if there is one */ 1603 if (pap_check_hook) { 1604 ret = (*pap_check_hook)(); 1605 if (ret >= 0) 1606 return ret; 1607 } 1608 1609 filename = _PATH_UPAPFILE; 1610 f = fopen(filename, "r"); 1611 if (f == NULL) 1612 return 0; 1613 1614 ret = scan_authfile(f, (explicit_remote? remote_name: NULL), our_name, 1615 NULL, &addrs, NULL, filename, 0); 1616 fclose(f); 1617 if (ret >= 0 && !some_ip_ok(addrs)) { 1618 if (lacks_ipp != 0) 1619 *lacks_ipp = 1; 1620 ret = -1; 1621 } 1622 if (addrs != 0) 1623 free_wordlist(addrs); 1624 1625 return ret >= 0; 1626 } 1627 1628 1629 /* 1630 * have_chap_secret - check whether we have a CHAP file with a 1631 * secret that we could possibly use for authenticating `client' 1632 * on `server'. Either can be the null string, meaning we don't 1633 * know the identity yet. 1634 */ 1635 static int 1636 have_chap_secret(client, server, need_ip, lacks_ipp) 1637 char *client; 1638 char *server; 1639 int need_ip; 1640 int *lacks_ipp; 1641 { 1642 FILE *f; 1643 int ret; 1644 char *filename; 1645 struct wordlist *addrs; 1646 1647 if (chap_check_hook) { 1648 ret = (*chap_check_hook)(); 1649 if (ret >= 0) { 1650 return ret; 1651 } 1652 } 1653 1654 filename = _PATH_CHAPFILE; 1655 f = fopen(filename, "r"); 1656 if (f == NULL) 1657 return 0; 1658 1659 if (client != NULL && client[0] == 0) 1660 client = NULL; 1661 else if (server != NULL && server[0] == 0) 1662 server = NULL; 1663 1664 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0); 1665 fclose(f); 1666 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) { 1667 if (lacks_ipp != 0) 1668 *lacks_ipp = 1; 1669 ret = -1; 1670 } 1671 if (addrs != 0) 1672 free_wordlist(addrs); 1673 1674 return ret >= 0; 1675 } 1676 1677 1678 /* 1679 * have_srp_secret - check whether we have a SRP file with a 1680 * secret that we could possibly use for authenticating `client' 1681 * on `server'. Either can be the null string, meaning we don't 1682 * know the identity yet. 1683 */ 1684 static int 1685 have_srp_secret(client, server, need_ip, lacks_ipp) 1686 char *client; 1687 char *server; 1688 int need_ip; 1689 int *lacks_ipp; 1690 { 1691 FILE *f; 1692 int ret; 1693 char *filename; 1694 struct wordlist *addrs; 1695 1696 filename = _PATH_SRPFILE; 1697 f = fopen(filename, "r"); 1698 if (f == NULL) 1699 return 0; 1700 1701 if (client != NULL && client[0] == 0) 1702 client = NULL; 1703 else if (server != NULL && server[0] == 0) 1704 server = NULL; 1705 1706 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0); 1707 fclose(f); 1708 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) { 1709 if (lacks_ipp != 0) 1710 *lacks_ipp = 1; 1711 ret = -1; 1712 } 1713 if (addrs != 0) 1714 free_wordlist(addrs); 1715 1716 return ret >= 0; 1717 } 1718 1719 1720 /* 1721 * get_secret - open the CHAP secret file and return the secret 1722 * for authenticating the given client on the given server. 1723 * (We could be either client or server). 1724 */ 1725 int 1726 get_secret(unit, client, server, secret, secret_len, am_server) 1727 int unit; 1728 char *client; 1729 char *server; 1730 char *secret; 1731 int *secret_len; 1732 int am_server; 1733 { 1734 FILE *f; 1735 int ret, len; 1736 char *filename; 1737 struct wordlist *addrs, *opts; 1738 char secbuf[MAXWORDLEN]; 1739 1740 if (!am_server && passwd[0] != 0) { 1741 strlcpy(secbuf, passwd, sizeof(secbuf)); 1742 } else if (!am_server && chap_passwd_hook) { 1743 if ( (*chap_passwd_hook)(client, secbuf) < 0) { 1744 error("Unable to obtain CHAP password for %s on %s from plugin", 1745 client, server); 1746 return 0; 1747 } 1748 } else { 1749 filename = _PATH_CHAPFILE; 1750 addrs = NULL; 1751 secbuf[0] = 0; 1752 1753 f = fopen(filename, "r"); 1754 if (f == NULL) { 1755 error("Can't open chap secret file %s: %m", filename); 1756 return 0; 1757 } 1758 check_access(f, filename); 1759 1760 ret = scan_authfile(f, client, server, secbuf, &addrs, &opts, filename, 0); 1761 fclose(f); 1762 if (ret < 0) 1763 return 0; 1764 1765 if (am_server) 1766 set_allowed_addrs(unit, addrs, opts); 1767 else if (opts != 0) 1768 free_wordlist(opts); 1769 if (addrs != 0) 1770 free_wordlist(addrs); 1771 } 1772 1773 len = strlen(secbuf); 1774 if (len > MAXSECRETLEN) { 1775 error("Secret for %s on %s is too long", client, server); 1776 len = MAXSECRETLEN; 1777 } 1778 BCOPY(secbuf, secret, len); 1779 BZERO(secbuf, sizeof(secbuf)); 1780 *secret_len = len; 1781 1782 return 1; 1783 } 1784 1785 1786 /* 1787 * get_srp_secret - open the SRP secret file and return the secret 1788 * for authenticating the given client on the given server. 1789 * (We could be either client or server). 1790 */ 1791 int 1792 get_srp_secret(unit, client, server, secret, am_server) 1793 int unit; 1794 char *client; 1795 char *server; 1796 char *secret; 1797 int am_server; 1798 { 1799 FILE *fp; 1800 int ret; 1801 char *filename; 1802 struct wordlist *addrs, *opts; 1803 1804 if (!am_server && passwd[0] != '\0') { 1805 strlcpy(secret, passwd, MAXWORDLEN); 1806 } else { 1807 filename = _PATH_SRPFILE; 1808 addrs = NULL; 1809 1810 fp = fopen(filename, "r"); 1811 if (fp == NULL) { 1812 error("Can't open srp secret file %s: %m", filename); 1813 return 0; 1814 } 1815 check_access(fp, filename); 1816 1817 secret[0] = '\0'; 1818 ret = scan_authfile(fp, client, server, secret, &addrs, &opts, 1819 filename, am_server); 1820 fclose(fp); 1821 if (ret < 0) 1822 return 0; 1823 1824 if (am_server) 1825 set_allowed_addrs(unit, addrs, opts); 1826 else if (opts != NULL) 1827 free_wordlist(opts); 1828 if (addrs != NULL) 1829 free_wordlist(addrs); 1830 } 1831 1832 return 1; 1833 } 1834 1835 /* 1836 * set_allowed_addrs() - set the list of allowed addresses. 1837 * Also looks for `--' indicating options to apply for this peer 1838 * and leaves the following words in extra_options. 1839 */ 1840 static void 1841 set_allowed_addrs(unit, addrs, opts) 1842 int unit; 1843 struct wordlist *addrs; 1844 struct wordlist *opts; 1845 { 1846 int n; 1847 struct wordlist *ap, **plink; 1848 struct permitted_ip *ip; 1849 char *ptr_word, *ptr_mask; 1850 struct hostent *hp; 1851 struct netent *np; 1852 u_int32_t a, mask, ah, offset; 1853 struct ipcp_options *wo = &ipcp_wantoptions[unit]; 1854 u_int32_t suggested_ip = 0; 1855 1856 if (addresses[unit] != NULL) 1857 free(addresses[unit]); 1858 addresses[unit] = NULL; 1859 if (extra_options != NULL) 1860 free_wordlist(extra_options); 1861 extra_options = opts; 1862 1863 /* 1864 * Count the number of IP addresses given. 1865 */ 1866 n = wordlist_count(addrs) + wordlist_count(noauth_addrs); 1867 if (n == 0) 1868 return; 1869 ip = (struct permitted_ip *) malloc((n + 1) * sizeof(struct permitted_ip)); 1870 if (ip == 0) 1871 return; 1872 1873 /* temporarily append the noauth_addrs list to addrs */ 1874 for (plink = &addrs; *plink != NULL; plink = &(*plink)->next) 1875 ; 1876 *plink = noauth_addrs; 1877 1878 n = 0; 1879 for (ap = addrs; ap != NULL; ap = ap->next) { 1880 /* "-" means no addresses authorized, "*" means any address allowed */ 1881 ptr_word = ap->word; 1882 if (strcmp(ptr_word, "-") == 0) 1883 break; 1884 if (strcmp(ptr_word, "*") == 0) { 1885 ip[n].permit = 1; 1886 ip[n].base = ip[n].mask = 0; 1887 ++n; 1888 break; 1889 } 1890 1891 ip[n].permit = 1; 1892 if (*ptr_word == '!') { 1893 ip[n].permit = 0; 1894 ++ptr_word; 1895 } 1896 1897 mask = ~ (u_int32_t) 0; 1898 offset = 0; 1899 ptr_mask = strchr (ptr_word, '/'); 1900 if (ptr_mask != NULL) { 1901 int bit_count; 1902 char *endp; 1903 1904 bit_count = (int) strtol (ptr_mask+1, &endp, 10); 1905 if (bit_count <= 0 || bit_count > 32) { 1906 warn("invalid address length %v in auth. address list", 1907 ptr_mask+1); 1908 continue; 1909 } 1910 bit_count = 32 - bit_count; /* # bits in host part */ 1911 if (*endp == '+') { 1912 offset = ifunit + 1; 1913 ++endp; 1914 } 1915 if (*endp != 0) { 1916 warn("invalid address length syntax: %v", ptr_mask+1); 1917 continue; 1918 } 1919 *ptr_mask = '\0'; 1920 mask <<= bit_count; 1921 } 1922 1923 hp = gethostbyname(ptr_word); 1924 if (hp != NULL && hp->h_addrtype == AF_INET) { 1925 a = *(u_int32_t *)hp->h_addr; 1926 } else { 1927 np = getnetbyname (ptr_word); 1928 if (np != NULL && np->n_addrtype == AF_INET) { 1929 a = htonl ((u_int32_t)np->n_net); 1930 if (ptr_mask == NULL) { 1931 /* calculate appropriate mask for net */ 1932 ah = ntohl(a); 1933 if (IN_CLASSA(ah)) 1934 mask = IN_CLASSA_NET; 1935 else if (IN_CLASSB(ah)) 1936 mask = IN_CLASSB_NET; 1937 else if (IN_CLASSC(ah)) 1938 mask = IN_CLASSC_NET; 1939 } 1940 } else { 1941 a = inet_addr (ptr_word); 1942 } 1943 } 1944 1945 if (ptr_mask != NULL) 1946 *ptr_mask = '/'; 1947 1948 if (a == (u_int32_t)-1L) { 1949 warn("unknown host %s in auth. address list", ap->word); 1950 continue; 1951 } 1952 if (offset != 0) { 1953 if (offset >= ~mask) { 1954 warn("interface unit %d too large for subnet %v", 1955 ifunit, ptr_word); 1956 continue; 1957 } 1958 a = htonl((ntohl(a) & mask) + offset); 1959 mask = ~(u_int32_t)0; 1960 } 1961 ip[n].mask = htonl(mask); 1962 ip[n].base = a & ip[n].mask; 1963 ++n; 1964 if (~mask == 0 && suggested_ip == 0) 1965 suggested_ip = a; 1966 } 1967 *plink = NULL; 1968 1969 ip[n].permit = 0; /* make the last entry forbid all addresses */ 1970 ip[n].base = 0; /* to terminate the list */ 1971 ip[n].mask = 0; 1972 1973 addresses[unit] = ip; 1974 1975 /* 1976 * If the address given for the peer isn't authorized, or if 1977 * the user hasn't given one, AND there is an authorized address 1978 * which is a single host, then use that if we find one. 1979 */ 1980 if (suggested_ip != 0 1981 && (wo->hisaddr == 0 || !auth_ip_addr(unit, wo->hisaddr))) { 1982 wo->hisaddr = suggested_ip; 1983 /* 1984 * Do we insist on this address? No, if there are other 1985 * addresses authorized than the suggested one. 1986 */ 1987 if (n > 1) 1988 wo->accept_remote = 1; 1989 } 1990 } 1991 1992 /* 1993 * auth_ip_addr - check whether the peer is authorized to use 1994 * a given IP address. Returns 1 if authorized, 0 otherwise. 1995 */ 1996 int 1997 auth_ip_addr(unit, addr) 1998 int unit; 1999 u_int32_t addr; 2000 { 2001 int ok; 2002 2003 /* don't allow loopback or multicast address */ 2004 if (bad_ip_adrs(addr)) 2005 return 0; 2006 2007 if (allowed_address_hook) { 2008 ok = allowed_address_hook(addr); 2009 if (ok >= 0) return ok; 2010 } 2011 2012 if (addresses[unit] != NULL) { 2013 ok = ip_addr_check(addr, addresses[unit]); 2014 if (ok >= 0) 2015 return ok; 2016 } 2017 2018 if (auth_required) 2019 return 0; /* no addresses authorized */ 2020 return allow_any_ip || privileged || !have_route_to(addr); 2021 } 2022 2023 static int 2024 ip_addr_check(addr, addrs) 2025 u_int32_t addr; 2026 struct permitted_ip *addrs; 2027 { 2028 for (; ; ++addrs) 2029 if ((addr & addrs->mask) == addrs->base) 2030 return addrs->permit; 2031 } 2032 2033 /* 2034 * bad_ip_adrs - return 1 if the IP address is one we don't want 2035 * to use, such as an address in the loopback net or a multicast address. 2036 * addr is in network byte order. 2037 */ 2038 int 2039 bad_ip_adrs(addr) 2040 u_int32_t addr; 2041 { 2042 addr = ntohl(addr); 2043 return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET 2044 || IN_MULTICAST(addr) || IN_BADCLASS(addr); 2045 } 2046 2047 /* 2048 * some_ip_ok - check a wordlist to see if it authorizes any 2049 * IP address(es). 2050 */ 2051 static int 2052 some_ip_ok(addrs) 2053 struct wordlist *addrs; 2054 { 2055 for (; addrs != 0; addrs = addrs->next) { 2056 if (addrs->word[0] == '-') 2057 break; 2058 if (addrs->word[0] != '!') 2059 return 1; /* some IP address is allowed */ 2060 } 2061 return 0; 2062 } 2063 2064 /* 2065 * auth_number - check whether the remote number is allowed to connect. 2066 * Returns 1 if authorized, 0 otherwise. 2067 */ 2068 int 2069 auth_number() 2070 { 2071 struct wordlist *wp = permitted_numbers; 2072 int l; 2073 2074 /* Allow all if no authorization list. */ 2075 if (!wp) 2076 return 1; 2077 2078 /* Allow if we have a match in the authorization list. */ 2079 while (wp) { 2080 /* trailing '*' wildcard */ 2081 l = strlen(wp->word); 2082 if ((wp->word)[l - 1] == '*') 2083 l--; 2084 if (!strncasecmp(wp->word, remote_number, l)) 2085 return 1; 2086 wp = wp->next; 2087 } 2088 2089 return 0; 2090 } 2091 2092 /* 2093 * check_access - complain if a secret file has too-liberal permissions. 2094 */ 2095 static void 2096 check_access(f, filename) 2097 FILE *f; 2098 char *filename; 2099 { 2100 struct stat sbuf; 2101 2102 if (fstat(fileno(f), &sbuf) < 0) { 2103 warn("cannot stat secret file %s: %m", filename); 2104 } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) { 2105 warn("Warning - secret file %s has world and/or group access", 2106 filename); 2107 } 2108 } 2109 2110 2111 /* 2112 * scan_authfile - Scan an authorization file for a secret suitable 2113 * for authenticating `client' on `server'. The return value is -1 2114 * if no secret is found, otherwise >= 0. The return value has 2115 * NONWILD_CLIENT set if the secret didn't have "*" for the client, and 2116 * NONWILD_SERVER set if the secret didn't have "*" for the server. 2117 * Any following words on the line up to a "--" (i.e. address authorization 2118 * info) are placed in a wordlist and returned in *addrs. Any 2119 * following words (extra options) are placed in a wordlist and 2120 * returned in *opts. 2121 * We assume secret is NULL or points to MAXWORDLEN bytes of space. 2122 * Flags are non-zero if we need two colons in the secret in order to 2123 * match. 2124 */ 2125 static int 2126 scan_authfile(f, client, server, secret, addrs, opts, filename, flags) 2127 FILE *f; 2128 char *client; 2129 char *server; 2130 char *secret; 2131 struct wordlist **addrs; 2132 struct wordlist **opts; 2133 char *filename; 2134 int flags; 2135 { 2136 int newline, xxx; 2137 int got_flag, best_flag; 2138 FILE *sf; 2139 struct wordlist *ap, *addr_list, *alist, **app; 2140 char word[MAXWORDLEN]; 2141 char atfile[MAXWORDLEN]; 2142 char lsecret[MAXWORDLEN]; 2143 char *cp; 2144 2145 if (addrs != NULL) 2146 *addrs = NULL; 2147 if (opts != NULL) 2148 *opts = NULL; 2149 addr_list = NULL; 2150 if (!getword(f, word, &newline, filename)) 2151 return -1; /* file is empty??? */ 2152 newline = 1; 2153 best_flag = -1; 2154 for (;;) { 2155 /* 2156 * Skip until we find a word at the start of a line. 2157 */ 2158 while (!newline && getword(f, word, &newline, filename)) 2159 ; 2160 if (!newline) 2161 break; /* got to end of file */ 2162 2163 /* 2164 * Got a client - check if it's a match or a wildcard. 2165 */ 2166 got_flag = 0; 2167 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) { 2168 newline = 0; 2169 continue; 2170 } 2171 if (!ISWILD(word)) 2172 got_flag = NONWILD_CLIENT; 2173 2174 /* 2175 * Now get a server and check if it matches. 2176 */ 2177 if (!getword(f, word, &newline, filename)) 2178 break; 2179 if (newline) 2180 continue; 2181 if (!ISWILD(word)) { 2182 if (server != NULL && strcmp(word, server) != 0) 2183 continue; 2184 got_flag |= NONWILD_SERVER; 2185 } 2186 2187 /* 2188 * Got some sort of a match - see if it's better than what 2189 * we have already. 2190 */ 2191 if (got_flag <= best_flag) 2192 continue; 2193 2194 /* 2195 * Get the secret. 2196 */ 2197 if (!getword(f, word, &newline, filename)) 2198 break; 2199 if (newline) 2200 continue; 2201 2202 /* 2203 * SRP-SHA1 authenticator should never be reading secrets from 2204 * a file. (Authenticatee may, though.) 2205 */ 2206 if (flags && ((cp = strchr(word, ':')) == NULL || 2207 strchr(cp + 1, ':') == NULL)) 2208 continue; 2209 2210 if (secret != NULL) { 2211 /* 2212 * Special syntax: @/pathname means read secret from file. 2213 */ 2214 if (word[0] == '@' && word[1] == '/') { 2215 strlcpy(atfile, word+1, sizeof(atfile)); 2216 if ((sf = fopen(atfile, "r")) == NULL) { 2217 warn("can't open indirect secret file %s", atfile); 2218 continue; 2219 } 2220 check_access(sf, atfile); 2221 if (!getword(sf, word, &xxx, atfile)) { 2222 warn("no secret in indirect secret file %s", atfile); 2223 fclose(sf); 2224 continue; 2225 } 2226 fclose(sf); 2227 } 2228 strlcpy(lsecret, word, sizeof(lsecret)); 2229 } 2230 2231 /* 2232 * Now read address authorization info and make a wordlist. 2233 */ 2234 app = &alist; 2235 for (;;) { 2236 size_t len; 2237 if (!getword(f, word, &newline, filename) || newline) 2238 break; 2239 len = strlen(word) + 1; 2240 ap = (struct wordlist *)malloc(sizeof(struct wordlist) + len); 2241 if (ap == NULL) 2242 novm("authorized addresses"); 2243 ap->word = (char *) (ap + 1); 2244 memcpy(ap->word, word, len); 2245 *app = ap; 2246 app = &ap->next; 2247 } 2248 *app = NULL; 2249 2250 /* 2251 * This is the best so far; remember it. 2252 */ 2253 best_flag = got_flag; 2254 if (addr_list) 2255 free_wordlist(addr_list); 2256 addr_list = alist; 2257 if (secret != NULL) 2258 strlcpy(secret, lsecret, MAXWORDLEN); 2259 2260 if (!newline) 2261 break; 2262 } 2263 2264 /* scan for a -- word indicating the start of options */ 2265 for (app = &addr_list; (ap = *app) != NULL; app = &ap->next) 2266 if (strcmp(ap->word, "--") == 0) 2267 break; 2268 /* ap = start of options */ 2269 if (ap != NULL) { 2270 ap = ap->next; /* first option */ 2271 free(*app); /* free the "--" word */ 2272 *app = NULL; /* terminate addr list */ 2273 } 2274 if (opts != NULL) 2275 *opts = ap; 2276 else if (ap != NULL) 2277 free_wordlist(ap); 2278 if (addrs != NULL) 2279 *addrs = addr_list; 2280 else if (addr_list != NULL) 2281 free_wordlist(addr_list); 2282 2283 return best_flag; 2284 } 2285 2286 /* 2287 * wordlist_count - return the number of items in a wordlist 2288 */ 2289 static int 2290 wordlist_count(wp) 2291 struct wordlist *wp; 2292 { 2293 int n; 2294 2295 for (n = 0; wp != NULL; wp = wp->next) 2296 ++n; 2297 return n; 2298 } 2299 2300 /* 2301 * free_wordlist - release memory allocated for a wordlist. 2302 */ 2303 static void 2304 free_wordlist(wp) 2305 struct wordlist *wp; 2306 { 2307 struct wordlist *next; 2308 2309 while (wp != NULL) { 2310 next = wp->next; 2311 free(wp); 2312 wp = next; 2313 } 2314 } 2315 2316 /* 2317 * auth_script_done - called when the auth-up or auth-down script 2318 * has finished. 2319 */ 2320 static void 2321 auth_script_done(arg) 2322 void *arg; 2323 { 2324 auth_script_pid = 0; 2325 switch (auth_script_state) { 2326 case s_up: 2327 if (auth_state == s_down) { 2328 auth_script_state = s_down; 2329 auth_script(_PATH_AUTHDOWN); 2330 } 2331 break; 2332 case s_down: 2333 if (auth_state == s_up) { 2334 auth_script_state = s_up; 2335 auth_script(_PATH_AUTHUP); 2336 } 2337 break; 2338 } 2339 } 2340 2341 /* 2342 * auth_script - execute a script with arguments 2343 * interface-name peer-name real-user tty speed 2344 */ 2345 static void 2346 auth_script(script) 2347 char *script; 2348 { 2349 char strspeed[32]; 2350 struct passwd *pw; 2351 char struid[32]; 2352 char *user_name; 2353 char *argv[8]; 2354 2355 if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL) 2356 user_name = pw->pw_name; 2357 else { 2358 slprintf(struid, sizeof(struid), "%d", getuid()); 2359 user_name = struid; 2360 } 2361 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate); 2362 2363 argv[0] = script; 2364 argv[1] = ifname; 2365 argv[2] = peer_authname; 2366 argv[3] = user_name; 2367 argv[4] = devnam; 2368 argv[5] = strspeed; 2369 argv[6] = NULL; 2370 2371 auth_script_pid = run_program(script, argv, 0, auth_script_done, NULL, 0); 2372 } 2373