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