lwip_auth.c

00001 /*
00002  * auth.c - PPP authentication and phase control.
00003  *
00004  * Copyright (c) 1993-2002 Paul Mackerras. All rights reserved.
00005  *
00006  * Redistribution and use in source and binary forms, with or without
00007  * modification, are permitted provided that the following conditions
00008  * are met:
00009  *
00010  * 1. Redistributions of source code must retain the above copyright
00011  *    notice, this list of conditions and the following disclaimer.
00012  *
00013  * 2. The name(s) of the authors of this software must not be used to
00014  *    endorse or promote products derived from this software without
00015  *    prior written permission.
00016  *
00017  * 3. Redistributions of any form whatsoever must retain the following
00018  *    acknowledgment:
00019  *    "This product includes software developed by Paul Mackerras
00020  *     <paulus@samba.org>".
00021  *
00022  * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
00023  * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
00024  * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
00025  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
00026  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
00027  * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
00028  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
00029  *
00030  * Derived from main.c, which is:
00031  *
00032  * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
00033  *
00034  * Redistribution and use in source and binary forms, with or without
00035  * modification, are permitted provided that the following conditions
00036  * are met:
00037  *
00038  * 1. Redistributions of source code must retain the above copyright
00039  *    notice, this list of conditions and the following disclaimer.
00040  *
00041  * 2. Redistributions in binary form must reproduce the above copyright
00042  *    notice, this list of conditions and the following disclaimer in
00043  *    the documentation and/or other materials provided with the
00044  *    distribution.
00045  *
00046  * 3. The name "Carnegie Mellon University" must not be used to
00047  *    endorse or promote products derived from this software without
00048  *    prior written permission. For permission or any legal
00049  *    details, please contact
00050  *      Office of Technology Transfer
00051  *      Carnegie Mellon University
00052  *      5000 Forbes Avenue
00053  *      Pittsburgh, PA  15213-3890
00054  *      (412) 268-4387, fax: (412) 268-7395
00055  *      tech-transfer@andrew.cmu.edu
00056  *
00057  * 4. Redistributions of any form whatsoever must retain the following
00058  *    acknowledgment:
00059  *    "This product includes software developed by Computing Services
00060  *     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
00061  *
00062  * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
00063  * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
00064  * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
00065  * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
00066  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
00067  * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
00068  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
00069  */
00070 
00071 #include "netif/ppp/ppp_opts.h"
00072 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
00073 
00074 #if 0 /* UNUSED */
00075 #include <stdio.h>
00076 #include <stddef.h>
00077 #include <stdlib.h>
00078 #include <unistd.h>
00079 #include <errno.h>
00080 #include <pwd.h>
00081 #include <grp.h>
00082 #include <string.h>
00083 #include <sys/types.h>
00084 #include <sys/stat.h>
00085 #include <sys/socket.h>
00086 #include <utmp.h>
00087 #include <fcntl.h>
00088 #if defined(_PATH_LASTLOG) && defined(__linux__)
00089 #include <lastlog.h>
00090 #endif
00091 
00092 #include <netdb.h>
00093 #include <netinet/in.h>
00094 #include <arpa/inet.h>
00095 
00096 #ifdef HAS_SHADOW
00097 #include <shadow.h>
00098 #ifndef PW_PPP
00099 #define PW_PPP PW_LOGIN
00100 #endif
00101 #endif
00102 
00103 #include <time.h>
00104 #endif /* UNUSED */
00105 
00106 #include "netif/ppp/ppp_impl.h"
00107 
00108 #include "netif/ppp/fsm.h"
00109 #include "netif/ppp/lcp.h"
00110 #if CCP_SUPPORT
00111 #include "netif/ppp/ccp.h"
00112 #endif /* CCP_SUPPORT */
00113 #if ECP_SUPPORT
00114 #include "netif/ppp/ecp.h"
00115 #endif /* ECP_SUPPORT */
00116 #include "netif/ppp/ipcp.h"
00117 #if PAP_SUPPORT
00118 #include "netif/ppp/upap.h"
00119 #endif /* PAP_SUPPORT */
00120 #if CHAP_SUPPORT
00121 #include "netif/ppp/chap-new.h"
00122 #endif /* CHAP_SUPPORT */
00123 #if EAP_SUPPORT
00124 #include "netif/ppp/eap.h"
00125 #endif /* EAP_SUPPORT */
00126 #if CBCP_SUPPORT
00127 #include "netif/ppp/cbcp.h"
00128 #endif
00129 
00130 #if 0 /* UNUSED */
00131 #include "session.h"
00132 #endif /* UNUSED */
00133 
00134 #if 0 /* UNUSED */
00135 /* Bits in scan_authfile return value */
00136 #define NONWILD_SERVER  1
00137 #define NONWILD_CLIENT  2
00138 
00139 #define ISWILD(word)    (word[0] == '*' && word[1] == 0)
00140 #endif /* UNUSED */
00141 
00142 #if 0 /* UNUSED */
00143 /* List of addresses which the peer may use. */
00144 static struct permitted_ip *addresses[NUM_PPP];
00145 
00146 /* Wordlist giving addresses which the peer may use
00147    without authenticating itself. */
00148 static struct wordlist *noauth_addrs;
00149 
00150 /* Remote telephone number, if available */
00151 char remote_number[MAXNAMELEN];
00152 
00153 /* Wordlist giving remote telephone numbers which may connect. */
00154 static struct wordlist *permitted_numbers;
00155 
00156 /* Extra options to apply, from the secrets file entry for the peer. */
00157 static struct wordlist *extra_options;
00158 #endif /* UNUSED */
00159 
00160 #if 0 /* UNUSED */
00161 /* Set if we require authentication only because we have a default route. */
00162 static bool default_auth;
00163 
00164 /* Hook to enable a plugin to control the idle time limit */
00165 int (*idle_time_hook) (struct ppp_idle *) = NULL;
00166 
00167 /* Hook for a plugin to say whether we can possibly authenticate any peer */
00168 int (*pap_check_hook) (void) = NULL;
00169 
00170 /* Hook for a plugin to check the PAP user and password */
00171 int (*pap_auth_hook) (char *user, char *passwd, char **msgp,
00172               struct wordlist **paddrs,
00173               struct wordlist **popts) = NULL;
00174 
00175 /* Hook for a plugin to know about the PAP user logout */
00176 void (*pap_logout_hook) (void) = NULL;
00177 
00178 /* Hook for a plugin to get the PAP password for authenticating us */
00179 int (*pap_passwd_hook) (char *user, char *passwd) = NULL;
00180 
00181 /* Hook for a plugin to say if we can possibly authenticate a peer using CHAP */
00182 int (*chap_check_hook) (void) = NULL;
00183 
00184 /* Hook for a plugin to get the CHAP password for authenticating us */
00185 int (*chap_passwd_hook) (char *user, char *passwd) = NULL;
00186 
00187 /* Hook for a plugin to say whether it is OK if the peer
00188    refuses to authenticate. */
00189 int (*null_auth_hook) (struct wordlist **paddrs,
00190                struct wordlist **popts) = NULL;
00191 
00192 int (*allowed_address_hook) (u32_t addr) = NULL;
00193 #endif /* UNUSED */
00194 
00195 #ifdef HAVE_MULTILINK
00196 /* Hook for plugin to hear when an interface joins a multilink bundle */
00197 void (*multilink_join_hook) (void) = NULL;
00198 #endif
00199 
00200 #if PPP_NOTIFY
00201 /* A notifier for when the peer has authenticated itself,
00202    and we are proceeding to the network phase. */
00203 struct notifier *auth_up_notifier = NULL;
00204 
00205 /* A notifier for when the link goes down. */
00206 struct notifier *link_down_notifier = NULL;
00207 #endif /* PPP_NOTIFY */
00208 
00209 /*
00210  * Option variables.
00211  */
00212 #if 0 /* MOVED TO ppp_settings */
00213 bool uselogin = 0;      /* Use /etc/passwd for checking PAP */
00214 bool session_mgmt = 0;      /* Do session management (login records) */
00215 bool cryptpap = 0;      /* Passwords in pap-secrets are encrypted */
00216 bool refuse_pap = 0;        /* Don't wanna auth. ourselves with PAP */
00217 bool refuse_chap = 0;       /* Don't wanna auth. ourselves with CHAP */
00218 bool refuse_eap = 0;        /* Don't wanna auth. ourselves with EAP */
00219 #if MSCHAP_SUPPORT
00220 bool refuse_mschap = 0;     /* Don't wanna auth. ourselves with MS-CHAP */
00221 bool refuse_mschap_v2 = 0;  /* Don't wanna auth. ourselves with MS-CHAPv2 */
00222 #else /* MSCHAP_SUPPORT */
00223 bool refuse_mschap = 1;     /* Don't wanna auth. ourselves with MS-CHAP */
00224 bool refuse_mschap_v2 = 1;  /* Don't wanna auth. ourselves with MS-CHAPv2 */
00225 #endif /* MSCHAP_SUPPORT */
00226 bool usehostname = 0;       /* Use hostname for our_name */
00227 bool auth_required = 0;     /* Always require authentication from peer */
00228 bool allow_any_ip = 0;      /* Allow peer to use any IP address */
00229 bool explicit_remote = 0;   /* User specified explicit remote name */
00230 bool explicit_user = 0;     /* Set if "user" option supplied */
00231 bool explicit_passwd = 0;   /* Set if "password" option supplied */
00232 char remote_name[MAXNAMELEN];   /* Peer's name for authentication */
00233 static char *uafname;       /* name of most recent +ua file */
00234 
00235 extern char *crypt (const char *, const char *);
00236 #endif /* UNUSED */
00237 /* Prototypes for procedures local to this file. */
00238 
00239 static void network_phase(ppp_pcb *pcb);
00240 #if PPP_IDLETIMELIMIT
00241 static void check_idle(void *arg);
00242 #endif /* PPP_IDLETIMELIMIT */
00243 #if PPP_MAXCONNECT
00244 static void connect_time_expired(void *arg);
00245 #endif /* PPP_MAXCONNECT */
00246 #if 0 /* UNUSED */
00247 static int  null_login (int);
00248 /* static int  get_pap_passwd (char *); */
00249 static int  have_pap_secret (int *);
00250 static int  have_chap_secret (char *, char *, int, int *);
00251 static int  have_srp_secret (char *client, char *server, int need_ip,
00252     int *lacks_ipp);
00253 static int  ip_addr_check (u32_t, struct permitted_ip *);
00254 static int  scan_authfile (FILE *, char *, char *, char *,
00255                    struct wordlist **, struct wordlist **,
00256                    char *, int);
00257 static void free_wordlist (struct wordlist *);
00258 static void set_allowed_addrs (int, struct wordlist *, struct wordlist *);
00259 static int  some_ip_ok (struct wordlist *);
00260 static int  setupapfile (char **);
00261 static int  privgroup (char **);
00262 static int  set_noauth_addr (char **);
00263 static int  set_permitted_number (char **);
00264 static void check_access (FILE *, char *);
00265 static int  wordlist_count (struct wordlist *);
00266 #endif /* UNUSED */
00267 
00268 #ifdef MAXOCTETS
00269 static void check_maxoctets (void *);
00270 #endif
00271 
00272 #if PPP_OPTIONS
00273 /*
00274  * Authentication-related options.
00275  */
00276 option_t auth_options[] = {
00277     { "auth", o_bool, &auth_required,
00278       "Require authentication from peer", OPT_PRIO | 1 },
00279     { "noauth", o_bool, &auth_required,
00280       "Don't require peer to authenticate", OPT_PRIOSUB | OPT_PRIV,
00281       &allow_any_ip },
00282     { "require-pap", o_bool, &lcp_wantoptions[0].neg_upap,
00283       "Require PAP authentication from peer",
00284       OPT_PRIOSUB | 1, &auth_required },
00285     { "+pap", o_bool, &lcp_wantoptions[0].neg_upap,
00286       "Require PAP authentication from peer",
00287       OPT_ALIAS | OPT_PRIOSUB | 1, &auth_required },
00288     { "require-chap", o_bool, &auth_required,
00289       "Require CHAP authentication from peer",
00290       OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
00291       &lcp_wantoptions[0].chap_mdtype },
00292     { "+chap", o_bool, &auth_required,
00293       "Require CHAP authentication from peer",
00294       OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
00295       &lcp_wantoptions[0].chap_mdtype },
00296 #if MSCHAP_SUPPORT
00297     { "require-mschap", o_bool, &auth_required,
00298       "Require MS-CHAP authentication from peer",
00299       OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
00300       &lcp_wantoptions[0].chap_mdtype },
00301     { "+mschap", o_bool, &auth_required,
00302       "Require MS-CHAP authentication from peer",
00303       OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
00304       &lcp_wantoptions[0].chap_mdtype },
00305     { "require-mschap-v2", o_bool, &auth_required,
00306       "Require MS-CHAPv2 authentication from peer",
00307       OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
00308       &lcp_wantoptions[0].chap_mdtype },
00309     { "+mschap-v2", o_bool, &auth_required,
00310       "Require MS-CHAPv2 authentication from peer",
00311       OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
00312       &lcp_wantoptions[0].chap_mdtype },
00313 #endif /* MSCHAP_SUPPORT */
00314 #if 0
00315     { "refuse-pap", o_bool, &refuse_pap,
00316       "Don't agree to auth to peer with PAP", 1 },
00317     { "-pap", o_bool, &refuse_pap,
00318       "Don't allow PAP authentication with peer", OPT_ALIAS | 1 },
00319     { "refuse-chap", o_bool, &refuse_chap,
00320       "Don't agree to auth to peer with CHAP",
00321       OPT_A2CLRB | MDTYPE_MD5,
00322       &lcp_allowoptions[0].chap_mdtype },
00323     { "-chap", o_bool, &refuse_chap,
00324       "Don't allow CHAP authentication with peer",
00325       OPT_ALIAS | OPT_A2CLRB | MDTYPE_MD5,
00326       &lcp_allowoptions[0].chap_mdtype },
00327 #endif
00328 #if MSCHAP_SUPPORT
00329 #if 0
00330     { "refuse-mschap", o_bool, &refuse_mschap,
00331       "Don't agree to auth to peer with MS-CHAP",
00332       OPT_A2CLRB | MDTYPE_MICROSOFT,
00333       &lcp_allowoptions[0].chap_mdtype },
00334     { "-mschap", o_bool, &refuse_mschap,
00335       "Don't allow MS-CHAP authentication with peer",
00336       OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT,
00337       &lcp_allowoptions[0].chap_mdtype },
00338     { "refuse-mschap-v2", o_bool, &refuse_mschap_v2,
00339       "Don't agree to auth to peer with MS-CHAPv2",
00340       OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
00341       &lcp_allowoptions[0].chap_mdtype },
00342     { "-mschap-v2", o_bool, &refuse_mschap_v2,
00343       "Don't allow MS-CHAPv2 authentication with peer",
00344       OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
00345       &lcp_allowoptions[0].chap_mdtype },
00346 #endif
00347 #endif /* MSCHAP_SUPPORT*/
00348 #if EAP_SUPPORT
00349     { "require-eap", o_bool, &lcp_wantoptions[0].neg_eap,
00350       "Require EAP authentication from peer", OPT_PRIOSUB | 1,
00351       &auth_required },
00352 #if 0
00353     { "refuse-eap", o_bool, &refuse_eap,
00354       "Don't agree to authenticate to peer with EAP", 1 },
00355 #endif
00356 #endif /* EAP_SUPPORT */
00357     { "name", o_string, our_name,
00358       "Set local name for authentication",
00359       OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXNAMELEN },
00360 
00361     { "+ua", o_special, (void *)setupapfile,
00362       "Get PAP user and password from file",
00363       OPT_PRIO | OPT_A2STRVAL, &uafname },
00364 
00365 #if 0
00366     { "user", o_string, user,
00367       "Set name for auth with peer", OPT_PRIO | OPT_STATIC,
00368       &explicit_user, MAXNAMELEN },
00369 
00370     { "password", o_string, passwd,
00371       "Password for authenticating us to the peer",
00372       OPT_PRIO | OPT_STATIC | OPT_HIDE,
00373       &explicit_passwd, MAXSECRETLEN },
00374 #endif
00375 
00376     { "usehostname", o_bool, &usehostname,
00377       "Must use hostname for authentication", 1 },
00378 
00379     { "remotename", o_string, remote_name,
00380       "Set remote name for authentication", OPT_PRIO | OPT_STATIC,
00381       &explicit_remote, MAXNAMELEN },
00382 
00383     { "login", o_bool, &uselogin,
00384       "Use system password database for PAP", OPT_A2COPY | 1 ,
00385       &session_mgmt },
00386     { "enable-session", o_bool, &session_mgmt,
00387       "Enable session accounting for remote peers", OPT_PRIV | 1 },
00388 
00389     { "papcrypt", o_bool, &cryptpap,
00390       "PAP passwords are encrypted", 1 },
00391 
00392     { "privgroup", o_special, (void *)privgroup,
00393       "Allow group members to use privileged options", OPT_PRIV | OPT_A2LIST },
00394 
00395     { "allow-ip", o_special, (void *)set_noauth_addr,
00396       "Set IP address(es) which can be used without authentication",
00397       OPT_PRIV | OPT_A2LIST },
00398 
00399     { "remotenumber", o_string, remote_number,
00400       "Set remote telephone number for authentication", OPT_PRIO | OPT_STATIC,
00401       NULL, MAXNAMELEN },
00402 
00403     { "allow-number", o_special, (void *)set_permitted_number,
00404       "Set telephone number(s) which are allowed to connect",
00405       OPT_PRIV | OPT_A2LIST },
00406 
00407     { NULL }
00408 };
00409 #endif /* PPP_OPTIONS */
00410 
00411 #if 0 /* UNUSED */
00412 /*
00413  * setupapfile - specifies UPAP info for authenticating with peer.
00414  */
00415 static int
00416 setupapfile(argv)
00417     char **argv;
00418 {
00419     FILE *ufile;
00420     int l;
00421     uid_t euid;
00422     char u[MAXNAMELEN], p[MAXSECRETLEN];
00423     char *fname;
00424 
00425     lcp_allowoptions[0].neg_upap = 1;
00426 
00427     /* open user info file */
00428     fname = strdup(*argv);
00429     if (fname == NULL)
00430     novm("+ua file name");
00431     euid = geteuid();
00432     if (seteuid(getuid()) == -1) {
00433     option_error("unable to reset uid before opening %s: %m", fname);
00434     return 0;
00435     }
00436     ufile = fopen(fname, "r");
00437     if (seteuid(euid) == -1)
00438     fatal("unable to regain privileges: %m");
00439     if (ufile == NULL) {
00440     option_error("unable to open user login data file %s", fname);
00441     return 0;
00442     }
00443     check_access(ufile, fname);
00444     uafname = fname;
00445 
00446     /* get username */
00447     if (fgets(u, MAXNAMELEN - 1, ufile) == NULL
00448     || fgets(p, MAXSECRETLEN - 1, ufile) == NULL) {
00449     fclose(ufile);
00450     option_error("unable to read user login data file %s", fname);
00451     return 0;
00452     }
00453     fclose(ufile);
00454 
00455     /* get rid of newlines */
00456     l = strlen(u);
00457     if (l > 0 && u[l-1] == '\n')
00458     u[l-1] = 0;
00459     l = strlen(p);
00460     if (l > 0 && p[l-1] == '\n')
00461     p[l-1] = 0;
00462 
00463     if (override_value("user", option_priority, fname)) {
00464     strlcpy(ppp_settings.user, u, sizeof(ppp_settings.user));
00465     explicit_user = 1;
00466     }
00467     if (override_value("passwd", option_priority, fname)) {
00468     strlcpy(ppp_settings.passwd, p, sizeof(ppp_settings.passwd));
00469     explicit_passwd = 1;
00470     }
00471 
00472     return (1);
00473 }
00474 
00475 /*
00476  * privgroup - allow members of the group to have privileged access.
00477  */
00478 static int
00479 privgroup(argv)
00480     char **argv;
00481 {
00482     struct group *g;
00483     int i;
00484 
00485     g = getgrnam(*argv);
00486     if (g == 0) {
00487     option_error("group %s is unknown", *argv);
00488     return 0;
00489     }
00490     for (i = 0; i < ngroups; ++i) {
00491     if (groups[i] == g->gr_gid) {
00492         privileged = 1;
00493         break;
00494     }
00495     }
00496     return 1;
00497 }
00498 
00499 
00500 /*
00501  * set_noauth_addr - set address(es) that can be used without authentication.
00502  * Equivalent to specifying an entry like `"" * "" addr' in pap-secrets.
00503  */
00504 static int
00505 set_noauth_addr(argv)
00506     char **argv;
00507 {
00508     char *addr = *argv;
00509     int l = strlen(addr) + 1;
00510     struct wordlist *wp;
00511 
00512     wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
00513     if (wp == NULL)
00514     novm("allow-ip argument");
00515     wp->word = (char *) (wp + 1);
00516     wp->next = noauth_addrs;
00517     MEMCPY(wp->word, addr, l);
00518     noauth_addrs = wp;
00519     return 1;
00520 }
00521 
00522 
00523 /*
00524  * set_permitted_number - set remote telephone number(s) that may connect.
00525  */
00526 static int
00527 set_permitted_number(argv)
00528     char **argv;
00529 {
00530     char *number = *argv;
00531     int l = strlen(number) + 1;
00532     struct wordlist *wp;
00533 
00534     wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
00535     if (wp == NULL)
00536     novm("allow-number argument");
00537     wp->word = (char *) (wp + 1);
00538     wp->next = permitted_numbers;
00539     MEMCPY(wp->word, number, l);
00540     permitted_numbers = wp;
00541     return 1;
00542 }
00543 #endif
00544 
00545 /*
00546  * An Open on LCP has requested a change from Dead to Establish phase.
00547  */
00548 void link_required(ppp_pcb *pcb) {
00549     LWIP_UNUSED_ARG(pcb);
00550 }
00551 
00552 #if 0
00553 /*
00554  * Bring the link up to the point of being able to do ppp.
00555  */
00556 void start_link(unit)
00557     int unit;
00558 {
00559     ppp_pcb *pcb = &ppp_pcb_list[unit];
00560     char *msg;
00561 
00562     status = EXIT_NEGOTIATION_FAILED;
00563     new_phase(pcb, PPP_PHASE_SERIALCONN);
00564 
00565     hungup = 0;
00566     devfd = the_channel->connect();
00567     msg = "Connect script failed";
00568     if (devfd < 0)
00569     goto fail;
00570 
00571     /* set up the serial device as a ppp interface */
00572     /*
00573      * N.B. we used to do tdb_writelock/tdb_writeunlock around this
00574      * (from establish_ppp to set_ifunit).  However, we won't be
00575      * doing the set_ifunit in multilink mode, which is the only time
00576      * we need the atomicity that the tdb_writelock/tdb_writeunlock
00577      * gives us.  Thus we don't need the tdb_writelock/tdb_writeunlock.
00578      */
00579     fd_ppp = the_channel->establish_ppp(devfd);
00580     msg = "ppp establishment failed";
00581     if (fd_ppp < 0) {
00582     status = EXIT_FATAL_ERROR;
00583     goto disconnect;
00584     }
00585 
00586     if (!demand && ifunit >= 0)
00587     set_ifunit(1);
00588 
00589     /*
00590      * Start opening the connection and wait for
00591      * incoming events (reply, timeout, etc.).
00592      */
00593     if (ifunit >= 0)
00594     ppp_notice("Connect: %s <--> %s", ifname, ppp_devnam);
00595     else
00596     ppp_notice("Starting negotiation on %s", ppp_devnam);
00597     add_fd(fd_ppp);
00598 
00599     new_phase(pcb, PPP_PHASE_ESTABLISH);
00600 
00601     lcp_lowerup(pcb);
00602     return;
00603 
00604  disconnect:
00605     new_phase(pcb, PPP_PHASE_DISCONNECT);
00606     if (the_channel->disconnect)
00607     the_channel->disconnect();
00608 
00609  fail:
00610     new_phase(pcb, PPP_PHASE_DEAD);
00611     if (the_channel->cleanup)
00612     (*the_channel->cleanup)();
00613 }
00614 #endif
00615 
00616 /*
00617  * LCP has terminated the link; go to the Dead phase and take the
00618  * physical layer down.
00619  */
00620 void link_terminated(ppp_pcb *pcb) {
00621     if (pcb->phase == PPP_PHASE_DEAD || pcb->phase == PPP_PHASE_MASTER)
00622     return;
00623     new_phase(pcb, PPP_PHASE_DISCONNECT);
00624 
00625 #if 0 /* UNUSED */
00626     if (pap_logout_hook) {
00627     pap_logout_hook();
00628     }
00629     session_end(devnam);
00630 #endif /* UNUSED */
00631 
00632     if (!doing_multilink) {
00633     ppp_notice("Connection terminated.");
00634 #if PPP_STATS_SUPPORT
00635     print_link_stats();
00636 #endif /* PPP_STATS_SUPPORT */
00637     } else
00638     ppp_notice("Link terminated.");
00639 
00640     lcp_lowerdown(pcb);
00641 
00642     new_phase(pcb, PPP_PHASE_DEAD);
00643     ppp_link_terminated(pcb);
00644 #if 0
00645     /*
00646      * Delete pid files before disestablishing ppp.  Otherwise it
00647      * can happen that another pppd gets the same unit and then
00648      * we delete its pid file.
00649      */
00650     if (!doing_multilink && !demand)
00651     remove_pidfiles();
00652 
00653     /*
00654      * If we may want to bring the link up again, transfer
00655      * the ppp unit back to the loopback.  Set the
00656      * real serial device back to its normal mode of operation.
00657      */
00658     if (fd_ppp >= 0) {
00659     remove_fd(fd_ppp);
00660     clean_check();
00661     the_channel->disestablish_ppp(devfd);
00662     if (doing_multilink)
00663         mp_exit_bundle();
00664     fd_ppp = -1;
00665     }
00666     if (!hungup)
00667     lcp_lowerdown(pcb);
00668     if (!doing_multilink && !demand)
00669     script_unsetenv("IFNAME");
00670 
00671     /*
00672      * Run disconnector script, if requested.
00673      * XXX we may not be able to do this if the line has hung up!
00674      */
00675     if (devfd >= 0 && the_channel->disconnect) {
00676     the_channel->disconnect();
00677     devfd = -1;
00678     }
00679     if (the_channel->cleanup)
00680     (*the_channel->cleanup)();
00681 
00682     if (doing_multilink && multilink_master) {
00683     if (!bundle_terminating)
00684         new_phase(pcb, PPP_PHASE_MASTER);
00685     else
00686         mp_bundle_terminated();
00687     } else
00688     new_phase(pcb, PPP_PHASE_DEAD);
00689 #endif
00690 }
00691 
00692 /*
00693  * LCP has gone down; it will either die or try to re-establish.
00694  */
00695 void link_down(ppp_pcb *pcb) {
00696 #if PPP_NOTIFY
00697     notify(link_down_notifier, 0);
00698 #endif /* PPP_NOTIFY */
00699 
00700     if (!doing_multilink) {
00701     upper_layers_down(pcb);
00702     if (pcb->phase != PPP_PHASE_DEAD && pcb->phase != PPP_PHASE_MASTER)
00703         new_phase(pcb, PPP_PHASE_ESTABLISH);
00704     }
00705     /* XXX if doing_multilink, should do something to stop
00706        network-layer traffic on the link */
00707 }
00708 
00709 void upper_layers_down(ppp_pcb *pcb) {
00710     int i;
00711     const struct protent *protp;
00712 
00713     for (i = 0; (protp = protocols[i]) != NULL; ++i) {
00714         if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
00715         (*protp->lowerdown)(pcb);
00716         if (protp->protocol < 0xC000 && protp->close != NULL)
00717         (*protp->close)(pcb, "LCP down");
00718     }
00719     pcb->num_np_open = 0;
00720     pcb->num_np_up = 0;
00721 }
00722 
00723 /*
00724  * The link is established.
00725  * Proceed to the Dead, Authenticate or Network phase as appropriate.
00726  */
00727 void link_established(ppp_pcb *pcb) {
00728 #if PPP_AUTH_SUPPORT
00729     int auth;
00730 #if PPP_SERVER
00731 #if PAP_SUPPORT
00732     lcp_options *wo = &pcb->lcp_wantoptions;
00733 #endif /* PAP_SUPPORT */
00734     lcp_options *go = &pcb->lcp_gotoptions;
00735 #endif /* PPP_SERVER */
00736     lcp_options *ho = &pcb->lcp_hisoptions;
00737 #endif /* PPP_AUTH_SUPPORT */
00738     int i;
00739     const struct protent *protp;
00740 
00741     /*
00742      * Tell higher-level protocols that LCP is up.
00743      */
00744     if (!doing_multilink) {
00745     for (i = 0; (protp = protocols[i]) != NULL; ++i)
00746         if (protp->protocol != PPP_LCP
00747         && protp->lowerup != NULL)
00748         (*protp->lowerup)(pcb);
00749     }
00750 
00751 #if PPP_AUTH_SUPPORT
00752 #if PPP_SERVER
00753 #if PPP_ALLOWED_ADDRS
00754     if (!auth_required && noauth_addrs != NULL)
00755     set_allowed_addrs(unit, NULL, NULL);
00756 #endif /* PPP_ALLOWED_ADDRS */
00757 
00758     if (pcb->settings.auth_required && !(0
00759 #if PAP_SUPPORT
00760     || go->neg_upap
00761 #endif /* PAP_SUPPORT */
00762 #if CHAP_SUPPORT
00763     || go->neg_chap
00764 #endif /* CHAP_SUPPORT */
00765 #if EAP_SUPPORT
00766     || go->neg_eap
00767 #endif /* EAP_SUPPORT */
00768     )) {
00769 
00770 #if PPP_ALLOWED_ADDRS
00771     /*
00772      * We wanted the peer to authenticate itself, and it refused:
00773      * if we have some address(es) it can use without auth, fine,
00774      * otherwise treat it as though it authenticated with PAP using
00775      * a username of "" and a password of "".  If that's not OK,
00776      * boot it out.
00777      */
00778     if (noauth_addrs != NULL) {
00779         set_allowed_addrs(unit, NULL, NULL);
00780     } else
00781 #endif /* PPP_ALLOWED_ADDRS */
00782     if (!pcb->settings.null_login
00783 #if PAP_SUPPORT
00784         || !wo->neg_upap
00785 #endif /* PAP_SUPPORT */
00786         ) {
00787         ppp_warn("peer refused to authenticate: terminating link");
00788 #if 0 /* UNUSED */
00789         status = EXIT_PEER_AUTH_FAILED;
00790 #endif /* UNUSED */
00791         pcb->err_code = PPPERR_AUTHFAIL;
00792         lcp_close(pcb, "peer refused to authenticate");
00793         return;
00794     }
00795     }
00796 #endif /* PPP_SERVER */
00797 
00798     new_phase(pcb, PPP_PHASE_AUTHENTICATE);
00799     auth = 0;
00800 #if PPP_SERVER
00801 #if EAP_SUPPORT
00802     if (go->neg_eap) {
00803     eap_authpeer(pcb, PPP_OUR_NAME);
00804     auth |= EAP_PEER;
00805     } else
00806 #endif /* EAP_SUPPORT */
00807 #if CHAP_SUPPORT
00808     if (go->neg_chap) {
00809     chap_auth_peer(pcb, PPP_OUR_NAME, CHAP_DIGEST(go->chap_mdtype));
00810     auth |= CHAP_PEER;
00811     } else
00812 #endif /* CHAP_SUPPORT */
00813 #if PAP_SUPPORT
00814     if (go->neg_upap) {
00815     upap_authpeer(pcb);
00816     auth |= PAP_PEER;
00817     } else
00818 #endif /* PAP_SUPPORT */
00819     {}
00820 #endif /* PPP_SERVER */
00821 
00822 #if EAP_SUPPORT
00823     if (ho->neg_eap) {
00824     eap_authwithpeer(pcb, pcb->settings.user);
00825     auth |= EAP_WITHPEER;
00826     } else
00827 #endif /* EAP_SUPPORT */
00828 #if CHAP_SUPPORT
00829     if (ho->neg_chap) {
00830     chap_auth_with_peer(pcb, pcb->settings.user, CHAP_DIGEST(ho->chap_mdtype));
00831     auth |= CHAP_WITHPEER;
00832     } else
00833 #endif /* CHAP_SUPPORT */
00834 #if PAP_SUPPORT
00835     if (ho->neg_upap) {
00836     upap_authwithpeer(pcb, pcb->settings.user, pcb->settings.passwd);
00837     auth |= PAP_WITHPEER;
00838     } else
00839 #endif /* PAP_SUPPORT */
00840     {}
00841 
00842     pcb->auth_pending = auth;
00843     pcb->auth_done = 0;
00844 
00845     if (!auth)
00846 #endif /* PPP_AUTH_SUPPORT */
00847     network_phase(pcb);
00848 }
00849 
00850 /*
00851  * Proceed to the network phase.
00852  */
00853 static void network_phase(ppp_pcb *pcb) {
00854 #if CBCP_SUPPORT
00855     ppp_pcb *pcb = &ppp_pcb_list[unit];
00856 #endif
00857 #if 0 /* UNUSED */
00858     lcp_options *go = &lcp_gotoptions[unit];
00859 #endif /* UNUSED */
00860 
00861 #if 0 /* UNUSED */
00862     /* Log calling number. */
00863     if (*remote_number)
00864     ppp_notice("peer from calling number %q authorized", remote_number);
00865 #endif /* UNUSED */
00866 
00867 #if PPP_NOTIFY
00868     /*
00869      * If the peer had to authenticate, notify it now.
00870      */
00871     if (0
00872 #if CHAP_SUPPORT
00873     || go->neg_chap
00874 #endif /* CHAP_SUPPORT */
00875 #if PAP_SUPPORT
00876     || go->neg_upap
00877 #endif /* PAP_SUPPORT */
00878 #if EAP_SUPPORT
00879     || go->neg_eap
00880 #endif /* EAP_SUPPORT */
00881     ) {
00882     notify(auth_up_notifier, 0);
00883     }
00884 #endif /* PPP_NOTIFY */
00885 
00886 #if CBCP_SUPPORT
00887     /*
00888      * If we negotiated callback, do it now.
00889      */
00890     if (go->neg_cbcp) {
00891     new_phase(pcb, PPP_PHASE_CALLBACK);
00892     (*cbcp_protent.open)(pcb);
00893     return;
00894     }
00895 #endif
00896 
00897 #if PPP_OPTIONS
00898     /*
00899      * Process extra options from the secrets file
00900      */
00901     if (extra_options) {
00902     options_from_list(extra_options, 1);
00903     free_wordlist(extra_options);
00904     extra_options = 0;
00905     }
00906 #endif /* PPP_OPTIONS */
00907     start_networks(pcb);
00908 }
00909 
00910 void start_networks(ppp_pcb *pcb) {
00911 #if CCP_SUPPORT || ECP_SUPPORT
00912     int i;
00913     const struct protent *protp;
00914 #endif /* CCP_SUPPORT || ECP_SUPPORT */
00915 
00916     new_phase(pcb, PPP_PHASE_NETWORK);
00917 
00918 #ifdef HAVE_MULTILINK
00919     if (multilink) {
00920     if (mp_join_bundle()) {
00921         if (multilink_join_hook)
00922         (*multilink_join_hook)();
00923         if (updetach && !nodetach)
00924         detach();
00925         return;
00926     }
00927     }
00928 #endif /* HAVE_MULTILINK */
00929 
00930 #ifdef PPP_FILTER
00931     if (!demand)
00932     set_filters(&pass_filter, &active_filter);
00933 #endif
00934 #if CCP_SUPPORT || ECP_SUPPORT
00935     /* Start CCP and ECP */
00936     for (i = 0; (protp = protocols[i]) != NULL; ++i)
00937     if (
00938         (0
00939 #if ECP_SUPPORT
00940         || protp->protocol == PPP_ECP
00941 #endif /* ECP_SUPPORT */
00942 #if CCP_SUPPORT
00943         || protp->protocol == PPP_CCP
00944 #endif /* CCP_SUPPORT */
00945         )
00946         && protp->open != NULL)
00947         (*protp->open)(pcb);
00948 #endif /* CCP_SUPPORT || ECP_SUPPORT */
00949 
00950     /*
00951      * Bring up other network protocols iff encryption is not required.
00952      */
00953     if (1
00954 #if ECP_SUPPORT
00955         && !ecp_gotoptions[unit].required
00956 #endif /* ECP_SUPPORT */
00957 #if MPPE_SUPPORT
00958         && !pcb->ccp_gotoptions.mppe
00959 #endif /* MPPE_SUPPORT */
00960         )
00961     continue_networks(pcb);
00962 }
00963 
00964 void continue_networks(ppp_pcb *pcb) {
00965     int i;
00966     const struct protent *protp;
00967 
00968     /*
00969      * Start the "real" network protocols.
00970      */
00971     for (i = 0; (protp = protocols[i]) != NULL; ++i)
00972     if (protp->protocol < 0xC000
00973 #if CCP_SUPPORT
00974         && protp->protocol != PPP_CCP
00975 #endif /* CCP_SUPPORT */
00976 #if ECP_SUPPORT
00977         && protp->protocol != PPP_ECP
00978 #endif /* ECP_SUPPORT */
00979         && protp->open != NULL) {
00980         (*protp->open)(pcb);
00981         ++pcb->num_np_open;
00982     }
00983 
00984     if (pcb->num_np_open == 0)
00985     /* nothing to do */
00986     lcp_close(pcb, "No network protocols running");
00987 }
00988 
00989 #if PPP_AUTH_SUPPORT
00990 #if PPP_SERVER
00991 /*
00992  * auth_check_passwd - Check the user name and passwd against configuration.
00993  *
00994  * returns:
00995  *      0: Authentication failed.
00996  *      1: Authentication succeeded.
00997  * In either case, msg points to an appropriate message and msglen to the message len.
00998  */
00999 int auth_check_passwd(ppp_pcb *pcb, char *auser, int userlen, char *apasswd, int passwdlen, const char **msg, int *msglen) {
01000   int secretuserlen;
01001   int secretpasswdlen;
01002 
01003   if (pcb->settings.user && pcb->settings.passwd) {
01004     secretuserlen = (int)strlen(pcb->settings.user);
01005     secretpasswdlen = (int)strlen(pcb->settings.passwd);
01006     if (secretuserlen == userlen
01007         && secretpasswdlen == passwdlen
01008         && !memcmp(auser, pcb->settings.user, userlen)
01009         && !memcmp(apasswd, pcb->settings.passwd, passwdlen) ) {
01010       *msg = "Login ok";
01011       *msglen = sizeof("Login ok")-1;
01012       return 1;
01013     }
01014   }
01015 
01016   *msg = "Login incorrect";
01017   *msglen = sizeof("Login incorrect")-1;
01018   return 0;
01019 }
01020 
01021 /*
01022  * The peer has failed to authenticate himself using `protocol'.
01023  */
01024 void auth_peer_fail(ppp_pcb *pcb, int protocol) {
01025     LWIP_UNUSED_ARG(protocol);
01026     /*
01027      * Authentication failure: take the link down
01028      */
01029 #if 0 /* UNUSED */
01030     status = EXIT_PEER_AUTH_FAILED;
01031 #endif /* UNUSED */
01032     pcb->err_code = PPPERR_AUTHFAIL;
01033     lcp_close(pcb, "Authentication failed");
01034 }
01035 
01036 /*
01037  * The peer has been successfully authenticated using `protocol'.
01038  */
01039 void auth_peer_success(ppp_pcb *pcb, int protocol, int prot_flavor, const char *name, int namelen) {
01040     int bit;
01041 #ifndef HAVE_MULTILINK
01042     LWIP_UNUSED_ARG(name);
01043     LWIP_UNUSED_ARG(namelen);
01044 #endif /* HAVE_MULTILINK */
01045 
01046     switch (protocol) {
01047 #if CHAP_SUPPORT
01048     case PPP_CHAP:
01049     bit = CHAP_PEER;
01050     switch (prot_flavor) {
01051     case CHAP_MD5:
01052         bit |= CHAP_MD5_PEER;
01053         break;
01054 #if MSCHAP_SUPPORT
01055     case CHAP_MICROSOFT:
01056         bit |= CHAP_MS_PEER;
01057         break;
01058     case CHAP_MICROSOFT_V2:
01059         bit |= CHAP_MS2_PEER;
01060         break;
01061 #endif /* MSCHAP_SUPPORT */
01062     default:
01063         break;
01064     }
01065     break;
01066 #endif /* CHAP_SUPPORT */
01067 #if PAP_SUPPORT
01068     case PPP_PAP:
01069     bit = PAP_PEER;
01070     break;
01071 #endif /* PAP_SUPPORT */
01072 #if EAP_SUPPORT
01073     case PPP_EAP:
01074     bit = EAP_PEER;
01075     break;
01076 #endif /* EAP_SUPPORT */
01077     default:
01078     ppp_warn("auth_peer_success: unknown protocol %x", protocol);
01079     return;
01080     }
01081 
01082 #ifdef HAVE_MULTILINK
01083     /*
01084      * Save the authenticated name of the peer for later.
01085      */
01086     if (namelen > (int)sizeof(pcb->peer_authname) - 1)
01087     namelen = (int)sizeof(pcb->peer_authname) - 1;
01088     MEMCPY(pcb->peer_authname, name, namelen);
01089     pcb->peer_authname[namelen] = 0;
01090 #endif /* HAVE_MULTILINK */
01091 #if 0 /* UNUSED */
01092     script_setenv("PEERNAME", , 0);
01093 #endif /* UNUSED */
01094 
01095     /* Save the authentication method for later. */
01096     pcb->auth_done |= bit;
01097 
01098     /*
01099      * If there is no more authentication still to be done,
01100      * proceed to the network (or callback) phase.
01101      */
01102     if ((pcb->auth_pending &= ~bit) == 0)
01103         network_phase(pcb);
01104 }
01105 #endif /* PPP_SERVER */
01106 
01107 /*
01108  * We have failed to authenticate ourselves to the peer using `protocol'.
01109  */
01110 void auth_withpeer_fail(ppp_pcb *pcb, int protocol) {
01111     LWIP_UNUSED_ARG(protocol);
01112     /*
01113      * We've failed to authenticate ourselves to our peer.
01114      *
01115      * Some servers keep sending CHAP challenges, but there
01116      * is no point in persisting without any way to get updated
01117      * authentication secrets.
01118      *
01119      * He'll probably take the link down, and there's not much
01120      * we can do except wait for that.
01121      */
01122     pcb->err_code = PPPERR_AUTHFAIL;
01123     lcp_close(pcb, "Failed to authenticate ourselves to peer");
01124 }
01125 
01126 /*
01127  * We have successfully authenticated ourselves with the peer using `protocol'.
01128  */
01129 void auth_withpeer_success(ppp_pcb *pcb, int protocol, int prot_flavor) {
01130     int bit;
01131     const char *prot = "";
01132 
01133     switch (protocol) {
01134 #if CHAP_SUPPORT
01135     case PPP_CHAP:
01136     bit = CHAP_WITHPEER;
01137     prot = "CHAP";
01138     switch (prot_flavor) {
01139     case CHAP_MD5:
01140         bit |= CHAP_MD5_WITHPEER;
01141         break;
01142 #if MSCHAP_SUPPORT
01143     case CHAP_MICROSOFT:
01144         bit |= CHAP_MS_WITHPEER;
01145         break;
01146     case CHAP_MICROSOFT_V2:
01147         bit |= CHAP_MS2_WITHPEER;
01148         break;
01149 #endif /* MSCHAP_SUPPORT */
01150     default:
01151         break;
01152     }
01153     break;
01154 #endif /* CHAP_SUPPORT */
01155 #if PAP_SUPPORT
01156     case PPP_PAP:
01157     bit = PAP_WITHPEER;
01158     prot = "PAP";
01159     break;
01160 #endif /* PAP_SUPPORT */
01161 #if EAP_SUPPORT
01162     case PPP_EAP:
01163     bit = EAP_WITHPEER;
01164     prot = "EAP";
01165     break;
01166 #endif /* EAP_SUPPORT */
01167     default:
01168     ppp_warn("auth_withpeer_success: unknown protocol %x", protocol);
01169     bit = 0;
01170     /* no break */
01171     }
01172 
01173     ppp_notice("%s authentication succeeded", prot);
01174 
01175     /* Save the authentication method for later. */
01176     pcb->auth_done |= bit;
01177 
01178     /*
01179      * If there is no more authentication still being done,
01180      * proceed to the network (or callback) phase.
01181      */
01182     if ((pcb->auth_pending &= ~bit) == 0)
01183     network_phase(pcb);
01184 }
01185 #endif /* PPP_AUTH_SUPPORT */
01186 
01187 
01188 /*
01189  * np_up - a network protocol has come up.
01190  */
01191 void np_up(ppp_pcb *pcb, int proto) {
01192 #if PPP_IDLETIMELIMIT
01193     int tlim;
01194 #endif /* PPP_IDLETIMELIMIT */
01195     LWIP_UNUSED_ARG(proto);
01196 
01197     if (pcb->num_np_up == 0) {
01198     /*
01199      * At this point we consider that the link has come up successfully.
01200      */
01201     new_phase(pcb, PPP_PHASE_RUNNING);
01202 
01203 #if PPP_IDLETIMELIMIT
01204 #if 0 /* UNUSED */
01205     if (idle_time_hook != 0)
01206         tlim = (*idle_time_hook)(NULL);
01207     else
01208 #endif /* UNUSED */
01209         tlim = pcb->settings.idle_time_limit;
01210     if (tlim > 0)
01211         TIMEOUT(check_idle, (void*)pcb, tlim);
01212 #endif /* PPP_IDLETIMELIMIT */
01213 
01214 #if PPP_MAXCONNECT
01215     /*
01216      * Set a timeout to close the connection once the maximum
01217      * connect time has expired.
01218      */
01219     if (pcb->settings.maxconnect > 0)
01220         TIMEOUT(connect_time_expired, (void*)pcb, pcb->settings.maxconnect);
01221 #endif /* PPP_MAXCONNECT */
01222 
01223 #ifdef MAXOCTETS
01224     if (maxoctets > 0)
01225         TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
01226 #endif
01227 
01228 #if 0 /* Unused */
01229     /*
01230      * Detach now, if the updetach option was given.
01231      */
01232     if (updetach && !nodetach)
01233         detach();
01234 #endif /* Unused */
01235     }
01236     ++pcb->num_np_up;
01237 }
01238 
01239 /*
01240  * np_down - a network protocol has gone down.
01241  */
01242 void np_down(ppp_pcb *pcb, int proto) {
01243     LWIP_UNUSED_ARG(proto);
01244     if (--pcb->num_np_up == 0) {
01245 #if PPP_IDLETIMELIMIT
01246     UNTIMEOUT(check_idle, (void*)pcb);
01247 #endif /* PPP_IDLETIMELIMIT */
01248 #if PPP_MAXCONNECT
01249     UNTIMEOUT(connect_time_expired, NULL);
01250 #endif /* PPP_MAXCONNECT */
01251 #ifdef MAXOCTETS
01252     UNTIMEOUT(check_maxoctets, NULL);
01253 #endif
01254     new_phase(pcb, PPP_PHASE_NETWORK);
01255     }
01256 }
01257 
01258 /*
01259  * np_finished - a network protocol has finished using the link.
01260  */
01261 void np_finished(ppp_pcb *pcb, int proto) {
01262     LWIP_UNUSED_ARG(proto);
01263     if (--pcb->num_np_open <= 0) {
01264     /* no further use for the link: shut up shop. */
01265     lcp_close(pcb, "No network protocols running");
01266     }
01267 }
01268 
01269 #ifdef MAXOCTETS
01270 static void
01271 check_maxoctets(arg)
01272     void *arg;
01273 {
01274 #if PPP_STATS_SUPPORT
01275     unsigned int used;
01276 
01277     update_link_stats(ifunit);
01278     link_stats_valid=0;
01279 
01280     switch(maxoctets_dir) {
01281     case PPP_OCTETS_DIRECTION_IN:
01282         used = link_stats.bytes_in;
01283         break;
01284     case PPP_OCTETS_DIRECTION_OUT:
01285         used = link_stats.bytes_out;
01286         break;
01287     case PPP_OCTETS_DIRECTION_MAXOVERAL:
01288     case PPP_OCTETS_DIRECTION_MAXSESSION:
01289         used = (link_stats.bytes_in > link_stats.bytes_out) ? link_stats.bytes_in : link_stats.bytes_out;
01290         break;
01291     default:
01292         used = link_stats.bytes_in+link_stats.bytes_out;
01293         break;
01294     }
01295     if (used > maxoctets) {
01296     ppp_notice("Traffic limit reached. Limit: %u Used: %u", maxoctets, used);
01297     status = EXIT_TRAFFIC_LIMIT;
01298     lcp_close(pcb, "Traffic limit");
01299 #if 0 /* UNUSED */
01300     need_holdoff = 0;
01301 #endif /* UNUSED */
01302     } else {
01303         TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
01304     }
01305 #endif /* PPP_STATS_SUPPORT */
01306 }
01307 #endif /* MAXOCTETS */
01308 
01309 #if PPP_IDLETIMELIMIT
01310 /*
01311  * check_idle - check whether the link has been idle for long
01312  * enough that we can shut it down.
01313  */
01314 static void check_idle(void *arg) {
01315     ppp_pcb *pcb = (ppp_pcb*)arg;
01316     struct ppp_idle idle;
01317     time_t itime;
01318     int tlim;
01319 
01320     if (!get_idle_time(pcb, &idle))
01321     return;
01322 #if 0 /* UNUSED */
01323     if (idle_time_hook != 0) {
01324     tlim = idle_time_hook(&idle);
01325     } else {
01326 #endif /* UNUSED */
01327     itime = LWIP_MIN(idle.xmit_idle, idle.recv_idle);
01328     tlim = pcb->settings.idle_time_limit - itime;
01329 #if 0 /* UNUSED */
01330     }
01331 #endif /* UNUSED */
01332     if (tlim <= 0) {
01333     /* link is idle: shut it down. */
01334     ppp_notice("Terminating connection due to lack of activity.");
01335     pcb->err_code = PPPERR_IDLETIMEOUT;
01336     lcp_close(pcb, "Link inactive");
01337 #if 0 /* UNUSED */
01338     need_holdoff = 0;
01339 #endif /* UNUSED */
01340     } else {
01341     TIMEOUT(check_idle, (void*)pcb, tlim);
01342     }
01343 }
01344 #endif /* PPP_IDLETIMELIMIT */
01345 
01346 #if PPP_MAXCONNECT
01347 /*
01348  * connect_time_expired - log a message and close the connection.
01349  */
01350 static void connect_time_expired(void *arg) {
01351     ppp_pcb *pcb = (ppp_pcb*)arg;
01352     ppp_info("Connect time expired");
01353     pcb->err_code = PPPERR_CONNECTTIME;
01354     lcp_close(pcb, "Connect time expired"); /* Close connection */
01355 }
01356 #endif /* PPP_MAXCONNECT */
01357 
01358 #if PPP_OPTIONS
01359 /*
01360  * auth_check_options - called to check authentication options.
01361  */
01362 void
01363 auth_check_options()
01364 {
01365     lcp_options *wo = &lcp_wantoptions[0];
01366     int can_auth;
01367     int lacks_ip;
01368 
01369     /* Default our_name to hostname, and user to our_name */
01370     if (our_name[0] == 0 || usehostname)
01371     strlcpy(our_name, hostname, sizeof(our_name));
01372     /* If a blank username was explicitly given as an option, trust
01373        the user and don't use our_name */
01374     if (ppp_settings.user[0] == 0 && !explicit_user)
01375     strlcpy(ppp_settings.user, our_name, sizeof(ppp_settings.user));
01376 
01377     /*
01378      * If we have a default route, require the peer to authenticate
01379      * unless the noauth option was given or the real user is root.
01380      */
01381     if (!auth_required && !allow_any_ip && have_route_to(0) && !privileged) {
01382     auth_required = 1;
01383     default_auth = 1;
01384     }
01385 
01386 #if CHAP_SUPPORT
01387     /* If we selected any CHAP flavors, we should probably negotiate it. :-) */
01388     if (wo->chap_mdtype)
01389     wo->neg_chap = 1;
01390 #endif /* CHAP_SUPPORT */
01391 
01392     /* If authentication is required, ask peer for CHAP, PAP, or EAP. */
01393     if (auth_required) {
01394     allow_any_ip = 0;
01395     if (1
01396 #if CHAP_SUPPORT
01397         && !wo->neg_chap
01398 #endif /* CHAP_SUPPORT */
01399 #if PAP_SUPPORT
01400         && !wo->neg_upap
01401 #endif /* PAP_SUPPORT */
01402 #if EAP_SUPPORT
01403         && !wo->neg_eap
01404 #endif /* EAP_SUPPORT */
01405         ) {
01406 #if CHAP_SUPPORT
01407         wo->neg_chap = CHAP_MDTYPE_SUPPORTED != MDTYPE_NONE;
01408         wo->chap_mdtype = CHAP_MDTYPE_SUPPORTED;
01409 #endif /* CHAP_SUPPORT */
01410 #if PAP_SUPPORT
01411         wo->neg_upap = 1;
01412 #endif /* PAP_SUPPORT */
01413 #if EAP_SUPPORT
01414         wo->neg_eap = 1;
01415 #endif /* EAP_SUPPORT */
01416     }
01417     } else {
01418 #if CHAP_SUPPORT
01419     wo->neg_chap = 0;
01420     wo->chap_mdtype = MDTYPE_NONE;
01421 #endif /* CHAP_SUPPORT */
01422 #if PAP_SUPPORT
01423     wo->neg_upap = 0;
01424 #endif /* PAP_SUPPORT */
01425 #if EAP_SUPPORT
01426     wo->neg_eap = 0;
01427 #endif /* EAP_SUPPORT */
01428     }
01429 
01430     /*
01431      * Check whether we have appropriate secrets to use
01432      * to authenticate the peer.  Note that EAP can authenticate by way
01433      * of a CHAP-like exchanges as well as SRP.
01434      */
01435     lacks_ip = 0;
01436 #if PAP_SUPPORT
01437     can_auth = wo->neg_upap && (uselogin || have_pap_secret(&lacks_ip));
01438 #else
01439     can_auth = 0;
01440 #endif /* PAP_SUPPORT */
01441     if (!can_auth && (0
01442 #if CHAP_SUPPORT
01443     || wo->neg_chap
01444 #endif /* CHAP_SUPPORT */
01445 #if EAP_SUPPORT
01446     || wo->neg_eap
01447 #endif /* EAP_SUPPORT */
01448     )) {
01449 #if CHAP_SUPPORT
01450     can_auth = have_chap_secret((explicit_remote? remote_name: NULL),
01451                     our_name, 1, &lacks_ip);
01452 #else
01453     can_auth = 0;
01454 #endif
01455     }
01456     if (!can_auth
01457 #if EAP_SUPPORT
01458     && wo->neg_eap
01459 #endif /* EAP_SUPPORT */
01460     ) {
01461     can_auth = have_srp_secret((explicit_remote? remote_name: NULL),
01462                     our_name, 1, &lacks_ip);
01463     }
01464 
01465     if (auth_required && !can_auth && noauth_addrs == NULL) {
01466     if (default_auth) {
01467         option_error(
01468 "By default the remote system is required to authenticate itself");
01469         option_error(
01470 "(because this system has a default route to the internet)");
01471     } else if (explicit_remote)
01472         option_error(
01473 "The remote system (%s) is required to authenticate itself",
01474              remote_name);
01475     else
01476         option_error(
01477 "The remote system is required to authenticate itself");
01478     option_error(
01479 "but I couldn't find any suitable secret (password) for it to use to do so.");
01480     if (lacks_ip)
01481         option_error(
01482 "(None of the available passwords would let it use an IP address.)");
01483 
01484     exit(1);
01485     }
01486 
01487     /*
01488      * Early check for remote number authorization.
01489      */
01490     if (!auth_number()) {
01491     ppp_warn("calling number %q is not authorized", remote_number);
01492     exit(EXIT_CNID_AUTH_FAILED);
01493     }
01494 }
01495 #endif /* PPP_OPTIONS */
01496 
01497 #if 0 /* UNUSED */
01498 /*
01499  * auth_reset - called when LCP is starting negotiations to recheck
01500  * authentication options, i.e. whether we have appropriate secrets
01501  * to use for authenticating ourselves and/or the peer.
01502  */
01503 void
01504 auth_reset(unit)
01505     int unit;
01506 {
01507     lcp_options *go = &lcp_gotoptions[unit];
01508     lcp_options *ao = &lcp_allowoptions[unit];
01509     int hadchap;
01510 
01511     hadchap = -1;
01512     ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
01513     ao->neg_chap = (!refuse_chap || !refuse_mschap || !refuse_mschap_v2)
01514     && (passwd[0] != 0 ||
01515         (hadchap = have_chap_secret(user, (explicit_remote? remote_name:
01516                            NULL), 0, NULL)));
01517     ao->neg_eap = !refuse_eap && (
01518     passwd[0] != 0 ||
01519     (hadchap == 1 || (hadchap == -1 && have_chap_secret(user,
01520         (explicit_remote? remote_name: NULL), 0, NULL))) ||
01521     have_srp_secret(user, (explicit_remote? remote_name: NULL), 0, NULL));
01522 
01523     hadchap = -1;
01524     if (go->neg_upap && !uselogin && !have_pap_secret(NULL))
01525     go->neg_upap = 0;
01526     if (go->neg_chap) {
01527     if (!(hadchap = have_chap_secret((explicit_remote? remote_name: NULL),
01528                   our_name, 1, NULL)))
01529         go->neg_chap = 0;
01530     }
01531     if (go->neg_eap &&
01532     (hadchap == 0 || (hadchap == -1 &&
01533         !have_chap_secret((explicit_remote? remote_name: NULL), our_name,
01534         1, NULL))) &&
01535     !have_srp_secret((explicit_remote? remote_name: NULL), our_name, 1,
01536         NULL))
01537     go->neg_eap = 0;
01538 }
01539 
01540 /*
01541  * check_passwd - Check the user name and passwd against the PAP secrets
01542  * file.  If requested, also check against the system password database,
01543  * and login the user if OK.
01544  *
01545  * returns:
01546  *  UPAP_AUTHNAK: Authentication failed.
01547  *  UPAP_AUTHACK: Authentication succeeded.
01548  * In either case, msg points to an appropriate message.
01549  */
01550 int
01551 check_passwd(unit, auser, userlen, apasswd, passwdlen, msg)
01552     int unit;
01553     char *auser;
01554     int userlen;
01555     char *apasswd;
01556     int passwdlen;
01557     char **msg;
01558 {
01559   return UPAP_AUTHNAK;
01560     int ret;
01561     char *filename;
01562     FILE *f;
01563     struct wordlist *addrs = NULL, *opts = NULL;
01564     char passwd[256], user[256];
01565     char secret[MAXWORDLEN];
01566     static int attempts = 0;
01567 
01568     /*
01569      * Make copies of apasswd and auser, then null-terminate them.
01570      * If there are unprintable characters in the password, make
01571      * them visible.
01572      */
01573     slprintf(ppp_settings.passwd, sizeof(ppp_settings.passwd), "%.*v", passwdlen, apasswd);
01574     slprintf(ppp_settings.user, sizeof(ppp_settings.user), "%.*v", userlen, auser);
01575     *msg = "";
01576 
01577     /*
01578      * Check if a plugin wants to handle this.
01579      */
01580     if (pap_auth_hook) {
01581     ret = (*pap_auth_hook)(ppp_settings.user, ppp_settings.passwd, msg, &addrs, &opts);
01582     if (ret >= 0) {
01583         /* note: set_allowed_addrs() saves opts (but not addrs):
01584            don't free it! */
01585         if (ret)
01586         set_allowed_addrs(unit, addrs, opts);
01587         else if (opts != 0)
01588         free_wordlist(opts);
01589         if (addrs != 0)
01590         free_wordlist(addrs);
01591         BZERO(ppp_settings.passwd, sizeof(ppp_settings.passwd));
01592         return ret? UPAP_AUTHACK: UPAP_AUTHNAK;
01593     }
01594     }
01595 
01596     /*
01597      * Open the file of pap secrets and scan for a suitable secret
01598      * for authenticating this user.
01599      */
01600     filename = _PATH_UPAPFILE;
01601     addrs = opts = NULL;
01602     ret = UPAP_AUTHNAK;
01603     f = fopen(filename, "r");
01604     if (f == NULL) {
01605     ppp_error("Can't open PAP password file %s: %m", filename);
01606 
01607     } else {
01608     check_access(f, filename);
01609     if (scan_authfile(f, ppp_settings.user, our_name, secret, &addrs, &opts, filename, 0) < 0) {
01610         ppp_warn("no PAP secret found for %s", user);
01611     } else {
01612         /*
01613          * If the secret is "@login", it means to check
01614          * the password against the login database.
01615          */
01616         int login_secret = strcmp(secret, "@login") == 0;
01617         ret = UPAP_AUTHACK;
01618         if (uselogin || login_secret) {
01619         /* login option or secret is @login */
01620         if (session_full(ppp_settings.user, ppp_settings.passwd, devnam, msg) == 0) {
01621             ret = UPAP_AUTHNAK;
01622         }
01623         } else if (session_mgmt) {
01624         if (session_check(ppp_settings.user, NULL, devnam, NULL) == 0) {
01625             ppp_warn("Peer %q failed PAP Session verification", user);
01626             ret = UPAP_AUTHNAK;
01627         }
01628         }
01629         if (secret[0] != 0 && !login_secret) {
01630         /* password given in pap-secrets - must match */
01631         if ((cryptpap || strcmp(ppp_settings.passwd, secret) != 0)
01632             && strcmp(crypt(ppp_settings.passwd, secret), secret) != 0)
01633             ret = UPAP_AUTHNAK;
01634         }
01635     }
01636     fclose(f);
01637     }
01638 
01639     if (ret == UPAP_AUTHNAK) {
01640         if (**msg == 0)
01641         *msg = "Login incorrect";
01642     /*
01643      * XXX can we ever get here more than once??
01644      * Frustrate passwd stealer programs.
01645      * Allow 10 tries, but start backing off after 3 (stolen from login).
01646      * On 10'th, drop the connection.
01647      */
01648     if (attempts++ >= 10) {
01649         ppp_warn("%d LOGIN FAILURES ON %s, %s", attempts, devnam, user);
01650         lcp_close(pcb, "login failed");
01651     }
01652     if (attempts > 3)
01653         sleep((u_int) (attempts - 3) * 5);
01654     if (opts != NULL)
01655         free_wordlist(opts);
01656 
01657     } else {
01658     attempts = 0;           /* Reset count */
01659     if (**msg == 0)
01660         *msg = "Login ok";
01661     set_allowed_addrs(unit, addrs, opts);
01662     }
01663 
01664     if (addrs != NULL)
01665     free_wordlist(addrs);
01666     BZERO(ppp_settings.passwd, sizeof(ppp_settings.passwd));
01667     BZERO(secret, sizeof(secret));
01668 
01669     return ret;
01670 }
01671 
01672 /*
01673  * null_login - Check if a username of "" and a password of "" are
01674  * acceptable, and iff so, set the list of acceptable IP addresses
01675  * and return 1.
01676  */
01677 static int
01678 null_login(unit)
01679     int unit;
01680 {
01681     char *filename;
01682     FILE *f;
01683     int i, ret;
01684     struct wordlist *addrs, *opts;
01685     char secret[MAXWORDLEN];
01686 
01687     /*
01688      * Check if a plugin wants to handle this.
01689      */
01690     ret = -1;
01691     if (null_auth_hook)
01692     ret = (*null_auth_hook)(&addrs, &opts);
01693 
01694     /*
01695      * Open the file of pap secrets and scan for a suitable secret.
01696      */
01697     if (ret <= 0) {
01698     filename = _PATH_UPAPFILE;
01699     addrs = NULL;
01700     f = fopen(filename, "r");
01701     if (f == NULL)
01702         return 0;
01703     check_access(f, filename);
01704 
01705     i = scan_authfile(f, "", our_name, secret, &addrs, &opts, filename, 0);
01706     ret = i >= 0 && secret[0] == 0;
01707     BZERO(secret, sizeof(secret));
01708     fclose(f);
01709     }
01710 
01711     if (ret)
01712     set_allowed_addrs(unit, addrs, opts);
01713     else if (opts != 0)
01714     free_wordlist(opts);
01715     if (addrs != 0)
01716     free_wordlist(addrs);
01717 
01718     return ret;
01719 }
01720 
01721 /*
01722  * get_pap_passwd - get a password for authenticating ourselves with
01723  * our peer using PAP.  Returns 1 on success, 0 if no suitable password
01724  * could be found.
01725  * Assumes passwd points to MAXSECRETLEN bytes of space (if non-null).
01726  */
01727 static int
01728 get_pap_passwd(passwd)
01729     char *passwd;
01730 {
01731     char *filename;
01732     FILE *f;
01733     int ret;
01734     char secret[MAXWORDLEN];
01735 
01736     /*
01737      * Check whether a plugin wants to supply this.
01738      */
01739     if (pap_passwd_hook) {
01740     ret = (*pap_passwd_hook)(ppp_settings,user, ppp_settings.passwd);
01741     if (ret >= 0)
01742         return ret;
01743     }
01744 
01745     filename = _PATH_UPAPFILE;
01746     f = fopen(filename, "r");
01747     if (f == NULL)
01748     return 0;
01749     check_access(f, filename);
01750     ret = scan_authfile(f, user,
01751             (remote_name[0]? remote_name: NULL),
01752             secret, NULL, NULL, filename, 0);
01753     fclose(f);
01754     if (ret < 0)
01755     return 0;
01756     if (passwd != NULL)
01757     strlcpy(passwd, secret, MAXSECRETLEN);
01758     BZERO(secret, sizeof(secret));
01759     return 1;
01760 }
01761 
01762 /*
01763  * have_pap_secret - check whether we have a PAP file with any
01764  * secrets that we could possibly use for authenticating the peer.
01765  */
01766 static int
01767 have_pap_secret(lacks_ipp)
01768     int *lacks_ipp;
01769 {
01770     FILE *f;
01771     int ret;
01772     char *filename;
01773     struct wordlist *addrs;
01774 
01775     /* let the plugin decide, if there is one */
01776     if (pap_check_hook) {
01777     ret = (*pap_check_hook)();
01778     if (ret >= 0)
01779         return ret;
01780     }
01781 
01782     filename = _PATH_UPAPFILE;
01783     f = fopen(filename, "r");
01784     if (f == NULL)
01785     return 0;
01786 
01787     ret = scan_authfile(f, (explicit_remote? remote_name: NULL), our_name,
01788             NULL, &addrs, NULL, filename, 0);
01789     fclose(f);
01790     if (ret >= 0 && !some_ip_ok(addrs)) {
01791     if (lacks_ipp != 0)
01792         *lacks_ipp = 1;
01793     ret = -1;
01794     }
01795     if (addrs != 0)
01796     free_wordlist(addrs);
01797 
01798     return ret >= 0;
01799 }
01800 
01801 /*
01802  * have_chap_secret - check whether we have a CHAP file with a
01803  * secret that we could possibly use for authenticating `client'
01804  * on `server'.  Either can be the null string, meaning we don't
01805  * know the identity yet.
01806  */
01807 static int
01808 have_chap_secret(client, server, need_ip, lacks_ipp)
01809     char *client;
01810     char *server;
01811     int need_ip;
01812     int *lacks_ipp;
01813 {
01814     FILE *f;
01815     int ret;
01816     char *filename;
01817     struct wordlist *addrs;
01818 
01819     if (chap_check_hook) {
01820     ret = (*chap_check_hook)();
01821     if (ret >= 0) {
01822         return ret;
01823     }
01824     }
01825 
01826     filename = _PATH_CHAPFILE;
01827     f = fopen(filename, "r");
01828     if (f == NULL)
01829     return 0;
01830 
01831     if (client != NULL && client[0] == 0)
01832     client = NULL;
01833     else if (server != NULL && server[0] == 0)
01834     server = NULL;
01835 
01836     ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
01837     fclose(f);
01838     if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
01839     if (lacks_ipp != 0)
01840         *lacks_ipp = 1;
01841     ret = -1;
01842     }
01843     if (addrs != 0)
01844     free_wordlist(addrs);
01845 
01846     return ret >= 0;
01847 }
01848 
01849 /*
01850  * have_srp_secret - check whether we have a SRP file with a
01851  * secret that we could possibly use for authenticating `client'
01852  * on `server'.  Either can be the null string, meaning we don't
01853  * know the identity yet.
01854  */
01855 static int
01856 have_srp_secret(client, server, need_ip, lacks_ipp)
01857     char *client;
01858     char *server;
01859     int need_ip;
01860     int *lacks_ipp;
01861 {
01862     FILE *f;
01863     int ret;
01864     char *filename;
01865     struct wordlist *addrs;
01866 
01867     filename = _PATH_SRPFILE;
01868     f = fopen(filename, "r");
01869     if (f == NULL)
01870     return 0;
01871 
01872     if (client != NULL && client[0] == 0)
01873     client = NULL;
01874     else if (server != NULL && server[0] == 0)
01875     server = NULL;
01876 
01877     ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
01878     fclose(f);
01879     if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
01880     if (lacks_ipp != 0)
01881         *lacks_ipp = 1;
01882     ret = -1;
01883     }
01884     if (addrs != 0)
01885     free_wordlist(addrs);
01886 
01887     return ret >= 0;
01888 }
01889 #endif /* UNUSED */
01890 
01891 #if PPP_AUTH_SUPPORT
01892 /*
01893  * get_secret - open the CHAP secret file and return the secret
01894  * for authenticating the given client on the given server.
01895  * (We could be either client or server).
01896  */
01897 int get_secret(ppp_pcb *pcb, const char *client, const char *server, char *secret, int *secret_len, int am_server) {
01898   int len;
01899   LWIP_UNUSED_ARG(server);
01900   LWIP_UNUSED_ARG(am_server);
01901 
01902   if (!client || !client[0] || !pcb->settings.user || !pcb->settings.passwd || strcmp(client, pcb->settings.user)) {
01903     return 0;
01904   }
01905 
01906   len = (int)strlen(pcb->settings.passwd);
01907   if (len > MAXSECRETLEN) {
01908     ppp_error("Secret for %s on %s is too long", client, server);
01909     len = MAXSECRETLEN;
01910   }
01911 
01912   MEMCPY(secret, pcb->settings.passwd, len);
01913   *secret_len = len;
01914   return 1;
01915 
01916 #if 0 /* UNUSED */
01917     FILE *f;
01918     int ret, len;
01919     char *filename;
01920     struct wordlist *addrs, *opts;
01921     char secbuf[MAXWORDLEN];
01922     struct wordlist *addrs;
01923     addrs = NULL;
01924 
01925     if (!am_server && ppp_settings.passwd[0] != 0) {
01926     strlcpy(secbuf, ppp_settings.passwd, sizeof(secbuf));
01927     } else if (!am_server && chap_passwd_hook) {
01928     if ( (*chap_passwd_hook)(client, secbuf) < 0) {
01929         ppp_error("Unable to obtain CHAP password for %s on %s from plugin",
01930           client, server);
01931         return 0;
01932     }
01933     } else {
01934     filename = _PATH_CHAPFILE;
01935     addrs = NULL;
01936     secbuf[0] = 0;
01937 
01938     f = fopen(filename, "r");
01939     if (f == NULL) {
01940         ppp_error("Can't open chap secret file %s: %m", filename);
01941         return 0;
01942     }
01943     check_access(f, filename);
01944 
01945     ret = scan_authfile(f, client, server, secbuf, &addrs, &opts, filename, 0);
01946     fclose(f);
01947     if (ret < 0)
01948         return 0;
01949 
01950     if (am_server)
01951         set_allowed_addrs(unit, addrs, opts);
01952     else if (opts != 0)
01953         free_wordlist(opts);
01954     if (addrs != 0)
01955         free_wordlist(addrs);
01956     }
01957 
01958     len = strlen(secbuf);
01959     if (len > MAXSECRETLEN) {
01960     ppp_error("Secret for %s on %s is too long", client, server);
01961     len = MAXSECRETLEN;
01962     }
01963     MEMCPY(secret, secbuf, len);
01964     BZERO(secbuf, sizeof(secbuf));
01965     *secret_len = len;
01966 
01967     return 1;
01968 #endif /* UNUSED */
01969 }
01970 #endif /* PPP_AUTH_SUPPORT */
01971 
01972 
01973 #if 0 /* UNUSED */
01974 /*
01975  * get_srp_secret - open the SRP secret file and return the secret
01976  * for authenticating the given client on the given server.
01977  * (We could be either client or server).
01978  */
01979 int
01980 get_srp_secret(unit, client, server, secret, am_server)
01981     int unit;
01982     char *client;
01983     char *server;
01984     char *secret;
01985     int am_server;
01986 {
01987     FILE *fp;
01988     int ret;
01989     char *filename;
01990     struct wordlist *addrs, *opts;
01991 
01992     if (!am_server && ppp_settings.passwd[0] != '\0') {
01993     strlcpy(secret, ppp_settings.passwd, MAXWORDLEN);
01994     } else {
01995     filename = _PATH_SRPFILE;
01996     addrs = NULL;
01997 
01998     fp = fopen(filename, "r");
01999     if (fp == NULL) {
02000         ppp_error("Can't open srp secret file %s: %m", filename);
02001         return 0;
02002     }
02003     check_access(fp, filename);
02004 
02005     secret[0] = '\0';
02006     ret = scan_authfile(fp, client, server, secret, &addrs, &opts,
02007         filename, am_server);
02008     fclose(fp);
02009     if (ret < 0)
02010         return 0;
02011 
02012     if (am_server)
02013         set_allowed_addrs(unit, addrs, opts);
02014     else if (opts != NULL)
02015         free_wordlist(opts);
02016     if (addrs != NULL)
02017         free_wordlist(addrs);
02018     }
02019 
02020     return 1;
02021 }
02022 
02023 /*
02024  * set_allowed_addrs() - set the list of allowed addresses.
02025  * Also looks for `--' indicating options to apply for this peer
02026  * and leaves the following words in extra_options.
02027  */
02028 static void
02029 set_allowed_addrs(unit, addrs, opts)
02030     int unit;
02031     struct wordlist *addrs;
02032     struct wordlist *opts;
02033 {
02034     int n;
02035     struct wordlist *ap, **plink;
02036     struct permitted_ip *ip;
02037     char *ptr_word, *ptr_mask;
02038     struct hostent *hp;
02039     struct netent *np;
02040     u32_t a, mask, ah, offset;
02041     struct ipcp_options *wo = &ipcp_wantoptions[unit];
02042     u32_t suggested_ip = 0;
02043 
02044     if (addresses[unit] != NULL)
02045     free(addresses[unit]);
02046     addresses[unit] = NULL;
02047     if (extra_options != NULL)
02048     free_wordlist(extra_options);
02049     extra_options = opts;
02050 
02051     /*
02052      * Count the number of IP addresses given.
02053      */
02054     n = wordlist_count(addrs) + wordlist_count(noauth_addrs);
02055     if (n == 0)
02056     return;
02057     ip = (struct permitted_ip *) malloc((n + 1) * sizeof(struct permitted_ip));
02058     if (ip == 0)
02059     return;
02060 
02061     /* temporarily append the noauth_addrs list to addrs */
02062     for (plink = &addrs; *plink != NULL; plink = &(*plink)->next)
02063     ;
02064     *plink = noauth_addrs;
02065 
02066     n = 0;
02067     for (ap = addrs; ap != NULL; ap = ap->next) {
02068     /* "-" means no addresses authorized, "*" means any address allowed */
02069     ptr_word = ap->word;
02070     if (strcmp(ptr_word, "-") == 0)
02071         break;
02072     if (strcmp(ptr_word, "*") == 0) {
02073         ip[n].permit = 1;
02074         ip[n].base = ip[n].mask = 0;
02075         ++n;
02076         break;
02077     }
02078 
02079     ip[n].permit = 1;
02080     if (*ptr_word == '!') {
02081         ip[n].permit = 0;
02082         ++ptr_word;
02083     }
02084 
02085     mask = ~ (u32_t) 0;
02086     offset = 0;
02087     ptr_mask = strchr (ptr_word, '/');
02088     if (ptr_mask != NULL) {
02089         int bit_count;
02090         char *endp;
02091 
02092         bit_count = (int) strtol (ptr_mask+1, &endp, 10);
02093         if (bit_count <= 0 || bit_count > 32) {
02094         ppp_warn("invalid address length %v in auth. address list",
02095              ptr_mask+1);
02096         continue;
02097         }
02098         bit_count = 32 - bit_count; /* # bits in host part */
02099         if (*endp == '+') {
02100         offset = ifunit + 1;
02101         ++endp;
02102         }
02103         if (*endp != 0) {
02104         ppp_warn("invalid address length syntax: %v", ptr_mask+1);
02105         continue;
02106         }
02107         *ptr_mask = '\0';
02108         mask <<= bit_count;
02109     }
02110 
02111     hp = gethostbyname(ptr_word);
02112     if (hp != NULL && hp->h_addrtype == AF_INET) {
02113         a = *(u32_t *)hp->h_addr;
02114     } else {
02115         np = getnetbyname (ptr_word);
02116         if (np != NULL && np->n_addrtype == AF_INET) {
02117         a = htonl ((u32_t)np->n_net);
02118         if (ptr_mask == NULL) {
02119             /* calculate appropriate mask for net */
02120             ah = ntohl(a);
02121             if (IN_CLASSA(ah))
02122             mask = IN_CLASSA_NET;
02123             else if (IN_CLASSB(ah))
02124             mask = IN_CLASSB_NET;
02125             else if (IN_CLASSC(ah))
02126             mask = IN_CLASSC_NET;
02127         }
02128         } else {
02129         a = inet_addr (ptr_word);
02130         }
02131     }
02132 
02133     if (ptr_mask != NULL)
02134         *ptr_mask = '/';
02135 
02136     if (a == (u32_t)-1L) {
02137         ppp_warn("unknown host %s in auth. address list", ap->word);
02138         continue;
02139     }
02140     if (offset != 0) {
02141         if (offset >= ~mask) {
02142         ppp_warn("interface unit %d too large for subnet %v",
02143              ifunit, ptr_word);
02144         continue;
02145         }
02146         a = htonl((ntohl(a) & mask) + offset);
02147         mask = ~(u32_t)0;
02148     }
02149     ip[n].mask = htonl(mask);
02150     ip[n].base = a & ip[n].mask;
02151     ++n;
02152     if (~mask == 0 && suggested_ip == 0)
02153         suggested_ip = a;
02154     }
02155     *plink = NULL;
02156 
02157     ip[n].permit = 0;       /* make the last entry forbid all addresses */
02158     ip[n].base = 0;     /* to terminate the list */
02159     ip[n].mask = 0;
02160 
02161     addresses[unit] = ip;
02162 
02163     /*
02164      * If the address given for the peer isn't authorized, or if
02165      * the user hasn't given one, AND there is an authorized address
02166      * which is a single host, then use that if we find one.
02167      */
02168     if (suggested_ip != 0
02169     && (wo->hisaddr == 0 || !auth_ip_addr(unit, wo->hisaddr))) {
02170     wo->hisaddr = suggested_ip;
02171     /*
02172      * Do we insist on this address?  No, if there are other
02173      * addresses authorized than the suggested one.
02174      */
02175     if (n > 1)
02176         wo->accept_remote = 1;
02177     }
02178 }
02179 
02180 /*
02181  * auth_ip_addr - check whether the peer is authorized to use
02182  * a given IP address.  Returns 1 if authorized, 0 otherwise.
02183  */
02184 int
02185 auth_ip_addr(unit, addr)
02186     int unit;
02187     u32_t addr;
02188 {
02189     int ok;
02190 
02191     /* don't allow loopback or multicast address */
02192     if (bad_ip_adrs(addr))
02193     return 0;
02194 
02195     if (allowed_address_hook) {
02196     ok = allowed_address_hook(addr);
02197     if (ok >= 0) return ok;
02198     }
02199 
02200     if (addresses[unit] != NULL) {
02201     ok = ip_addr_check(addr, addresses[unit]);
02202     if (ok >= 0)
02203         return ok;
02204     }
02205 
02206     if (auth_required)
02207     return 0;       /* no addresses authorized */
02208     return allow_any_ip || privileged || !have_route_to(addr);
02209 }
02210 
02211 static int
02212 ip_addr_check(addr, addrs)
02213     u32_t addr;
02214     struct permitted_ip *addrs;
02215 {
02216     for (; ; ++addrs)
02217     if ((addr & addrs->mask) == addrs->base)
02218         return addrs->permit;
02219 }
02220 
02221 /*
02222  * bad_ip_adrs - return 1 if the IP address is one we don't want
02223  * to use, such as an address in the loopback net or a multicast address.
02224  * addr is in network byte order.
02225  */
02226 int
02227 bad_ip_adrs(addr)
02228     u32_t addr;
02229 {
02230     addr = ntohl(addr);
02231     return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
02232     || IN_MULTICAST(addr) || IN_BADCLASS(addr);
02233 }
02234 
02235 /*
02236  * some_ip_ok - check a wordlist to see if it authorizes any
02237  * IP address(es).
02238  */
02239 static int
02240 some_ip_ok(addrs)
02241     struct wordlist *addrs;
02242 {
02243     for (; addrs != 0; addrs = addrs->next) {
02244     if (addrs->word[0] == '-')
02245         break;
02246     if (addrs->word[0] != '!')
02247         return 1;       /* some IP address is allowed */
02248     }
02249     return 0;
02250 }
02251 
02252 /*
02253  * auth_number - check whether the remote number is allowed to connect.
02254  * Returns 1 if authorized, 0 otherwise.
02255  */
02256 int
02257 auth_number()
02258 {
02259     struct wordlist *wp = permitted_numbers;
02260     int l;
02261 
02262     /* Allow all if no authorization list. */
02263     if (!wp)
02264     return 1;
02265 
02266     /* Allow if we have a match in the authorization list. */
02267     while (wp) {
02268     /* trailing '*' wildcard */
02269     l = strlen(wp->word);
02270     if ((wp->word)[l - 1] == '*')
02271         l--;
02272     if (!strncasecmp(wp->word, remote_number, l))
02273         return 1;
02274     wp = wp->next;
02275     }
02276 
02277     return 0;
02278 }
02279 
02280 /*
02281  * check_access - complain if a secret file has too-liberal permissions.
02282  */
02283 static void
02284 check_access(f, filename)
02285     FILE *f;
02286     char *filename;
02287 {
02288     struct stat sbuf;
02289 
02290     if (fstat(fileno(f), &sbuf) < 0) {
02291     ppp_warn("cannot stat secret file %s: %m", filename);
02292     } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
02293     ppp_warn("Warning - secret file %s has world and/or group access",
02294          filename);
02295     }
02296 }
02297 
02298 /*
02299  * scan_authfile - Scan an authorization file for a secret suitable
02300  * for authenticating `client' on `server'.  The return value is -1
02301  * if no secret is found, otherwise >= 0.  The return value has
02302  * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
02303  * NONWILD_SERVER set if the secret didn't have "*" for the server.
02304  * Any following words on the line up to a "--" (i.e. address authorization
02305  * info) are placed in a wordlist and returned in *addrs.  Any
02306  * following words (extra options) are placed in a wordlist and
02307  * returned in *opts.
02308  * We assume secret is NULL or points to MAXWORDLEN bytes of space.
02309  * Flags are non-zero if we need two colons in the secret in order to
02310  * match.
02311  */
02312 static int
02313 scan_authfile(f, client, server, secret, addrs, opts, filename, flags)
02314     FILE *f;
02315     char *client;
02316     char *server;
02317     char *secret;
02318     struct wordlist **addrs;
02319     struct wordlist **opts;
02320     char *filename;
02321     int flags;
02322 {
02323     int newline, xxx;
02324     int got_flag, best_flag;
02325     FILE *sf;
02326     struct wordlist *ap, *addr_list, *alist, **app;
02327     char word[MAXWORDLEN];
02328     char atfile[MAXWORDLEN];
02329     char lsecret[MAXWORDLEN];
02330     char *cp;
02331 
02332     if (addrs != NULL)
02333     *addrs = NULL;
02334     if (opts != NULL)
02335     *opts = NULL;
02336     addr_list = NULL;
02337     if (!getword(f, word, &newline, filename))
02338     return -1;      /* file is empty??? */
02339     newline = 1;
02340     best_flag = -1;
02341     for (;;) {
02342     /*
02343      * Skip until we find a word at the start of a line.
02344      */
02345     while (!newline && getword(f, word, &newline, filename))
02346         ;
02347     if (!newline)
02348         break;      /* got to end of file */
02349 
02350     /*
02351      * Got a client - check if it's a match or a wildcard.
02352      */
02353     got_flag = 0;
02354     if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
02355         newline = 0;
02356         continue;
02357     }
02358     if (!ISWILD(word))
02359         got_flag = NONWILD_CLIENT;
02360 
02361     /*
02362      * Now get a server and check if it matches.
02363      */
02364     if (!getword(f, word, &newline, filename))
02365         break;
02366     if (newline)
02367         continue;
02368     if (!ISWILD(word)) {
02369         if (server != NULL && strcmp(word, server) != 0)
02370         continue;
02371         got_flag |= NONWILD_SERVER;
02372     }
02373 
02374     /*
02375      * Got some sort of a match - see if it's better than what
02376      * we have already.
02377      */
02378     if (got_flag <= best_flag)
02379         continue;
02380 
02381     /*
02382      * Get the secret.
02383      */
02384     if (!getword(f, word, &newline, filename))
02385         break;
02386     if (newline)
02387         continue;
02388 
02389     /*
02390      * SRP-SHA1 authenticator should never be reading secrets from
02391      * a file.  (Authenticatee may, though.)
02392      */
02393     if (flags && ((cp = strchr(word, ':')) == NULL ||
02394         strchr(cp + 1, ':') == NULL))
02395         continue;
02396 
02397     if (secret != NULL) {
02398         /*
02399          * Special syntax: @/pathname means read secret from file.
02400          */
02401         if (word[0] == '@' && word[1] == '/') {
02402         strlcpy(atfile, word+1, sizeof(atfile));
02403         if ((sf = fopen(atfile, "r")) == NULL) {
02404             ppp_warn("can't open indirect secret file %s", atfile);
02405             continue;
02406         }
02407         check_access(sf, atfile);
02408         if (!getword(sf, word, &xxx, atfile)) {
02409             ppp_warn("no secret in indirect secret file %s", atfile);
02410             fclose(sf);
02411             continue;
02412         }
02413         fclose(sf);
02414         }
02415         strlcpy(lsecret, word, sizeof(lsecret));
02416     }
02417 
02418     /*
02419      * Now read address authorization info and make a wordlist.
02420      */
02421     app = &alist;
02422     for (;;) {
02423         if (!getword(f, word, &newline, filename) || newline)
02424         break;
02425         ap = (struct wordlist *)
02426             malloc(sizeof(struct wordlist) + strlen(word) + 1);
02427         if (ap == NULL)
02428         novm("authorized addresses");
02429         ap->word = (char *) (ap + 1);
02430         strcpy(ap->word, word);
02431         *app = ap;
02432         app = &ap->next;
02433     }
02434     *app = NULL;
02435 
02436     /*
02437      * This is the best so far; remember it.
02438      */
02439     best_flag = got_flag;
02440     if (addr_list)
02441         free_wordlist(addr_list);
02442     addr_list = alist;
02443     if (secret != NULL)
02444         strlcpy(secret, lsecret, MAXWORDLEN);
02445 
02446     if (!newline)
02447         break;
02448     }
02449 
02450     /* scan for a -- word indicating the start of options */
02451     for (app = &addr_list; (ap = *app) != NULL; app = &ap->next)
02452     if (strcmp(ap->word, "--") == 0)
02453         break;
02454     /* ap = start of options */
02455     if (ap != NULL) {
02456     ap = ap->next;      /* first option */
02457     free(*app);         /* free the "--" word */
02458     *app = NULL;        /* terminate addr list */
02459     }
02460     if (opts != NULL)
02461     *opts = ap;
02462     else if (ap != NULL)
02463     free_wordlist(ap);
02464     if (addrs != NULL)
02465     *addrs = addr_list;
02466     else if (addr_list != NULL)
02467     free_wordlist(addr_list);
02468 
02469     return best_flag;
02470 }
02471 
02472 /*
02473  * wordlist_count - return the number of items in a wordlist
02474  */
02475 static int
02476 wordlist_count(wp)
02477     struct wordlist *wp;
02478 {
02479     int n;
02480 
02481     for (n = 0; wp != NULL; wp = wp->next)
02482     ++n;
02483     return n;
02484 }
02485 
02486 /*
02487  * free_wordlist - release memory allocated for a wordlist.
02488  */
02489 static void
02490 free_wordlist(wp)
02491     struct wordlist *wp;
02492 {
02493     struct wordlist *next;
02494 
02495     while (wp != NULL) {
02496     next = wp->next;
02497     free(wp);
02498     wp = next;
02499     }
02500 }
02501 #endif /* UNUSED */
02502 
02503 #endif /* PPP_SUPPORT */