/* * auth.c - PPP authentication and phase control. * * Copyright (c) 1993-2002 Paul Mackerras. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. The name(s) of the authors of this software must not be used to * endorse or promote products derived from this software without * prior written permission. * * 3. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by Paul Mackerras * ". * * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * Derived from main.c, which is: * * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The name "Carnegie Mellon University" must not be used to * endorse or promote products derived from this software without * prior written permission. For permission or any legal * details, please contact * Office of Technology Transfer * Carnegie Mellon University * 5000 Forbes Avenue * Pittsburgh, PA 15213-3890 * (412) 268-4387, fax: (412) 268-7395 * tech-transfer@andrew.cmu.edu * * 4. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by Computing Services * at Carnegie Mellon University (http://www.cmu.edu/computing/)." * * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include "netif/ppp/ppp_opts.h" #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */ #if 0 /* UNUSED */ #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined(_PATH_LASTLOG) && defined(__linux__) #include #endif #include #include #include #ifdef HAS_SHADOW #include #ifndef PW_PPP #define PW_PPP PW_LOGIN #endif #endif #include #endif /* UNUSED */ #include "netif/ppp/ppp_impl.h" #include "netif/ppp/fsm.h" #include "netif/ppp/lcp.h" #if CCP_SUPPORT #include "netif/ppp/ccp.h" #endif /* CCP_SUPPORT */ #if ECP_SUPPORT #include "netif/ppp/ecp.h" #endif /* ECP_SUPPORT */ #include "netif/ppp/ipcp.h" #if PAP_SUPPORT #include "netif/ppp/upap.h" #endif /* PAP_SUPPORT */ #if CHAP_SUPPORT #include "netif/ppp/chap-new.h" #endif /* CHAP_SUPPORT */ #if EAP_SUPPORT #include "netif/ppp/eap.h" #endif /* EAP_SUPPORT */ #if CBCP_SUPPORT #include "netif/ppp/cbcp.h" #endif #if 0 /* UNUSED */ #include "session.h" #endif /* UNUSED */ #if 0 /* UNUSED */ /* Bits in scan_authfile return value */ #define NONWILD_SERVER 1 #define NONWILD_CLIENT 2 #define ISWILD(word) (word[0] == '*' && word[1] == 0) #endif /* UNUSED */ #if 0 /* UNUSED */ /* List of addresses which the peer may use. */ static struct permitted_ip *addresses[NUM_PPP]; /* Wordlist giving addresses which the peer may use without authenticating itself. */ static struct wordlist *noauth_addrs; /* Remote telephone number, if available */ char remote_number[MAXNAMELEN]; /* Wordlist giving remote telephone numbers which may connect. */ static struct wordlist *permitted_numbers; /* Extra options to apply, from the secrets file entry for the peer. */ static struct wordlist *extra_options; #endif /* UNUSED */ #if 0 /* UNUSED */ /* Set if we require authentication only because we have a default route. */ static bool default_auth; /* Hook to enable a plugin to control the idle time limit */ int (*idle_time_hook) (struct ppp_idle *) = NULL; /* Hook for a plugin to say whether we can possibly authenticate any peer */ int (*pap_check_hook) (void) = NULL; /* Hook for a plugin to check the PAP user and password */ int (*pap_auth_hook) (char *user, char *passwd, char **msgp, struct wordlist **paddrs, struct wordlist **popts) = NULL; /* Hook for a plugin to know about the PAP user logout */ void (*pap_logout_hook) (void) = NULL; /* Hook for a plugin to get the PAP password for authenticating us */ int (*pap_passwd_hook) (char *user, char *passwd) = NULL; /* Hook for a plugin to say if we can possibly authenticate a peer using CHAP */ int (*chap_check_hook) (void) = NULL; /* Hook for a plugin to get the CHAP password for authenticating us */ int (*chap_passwd_hook) (char *user, char *passwd) = NULL; /* Hook for a plugin to say whether it is OK if the peer refuses to authenticate. */ int (*null_auth_hook) (struct wordlist **paddrs, struct wordlist **popts) = NULL; int (*allowed_address_hook) (u32_t addr) = NULL; #endif /* UNUSED */ #ifdef HAVE_MULTILINK /* Hook for plugin to hear when an interface joins a multilink bundle */ void (*multilink_join_hook) (void) = NULL; #endif #if PPP_NOTIFY /* A notifier for when the peer has authenticated itself, and we are proceeding to the network phase. */ struct notifier *auth_up_notifier = NULL; /* A notifier for when the link goes down. */ struct notifier *link_down_notifier = NULL; #endif /* PPP_NOTIFY */ /* * Option variables. */ #if 0 /* MOVED TO ppp_settings */ bool uselogin = 0; /* Use /etc/passwd for checking PAP */ bool session_mgmt = 0; /* Do session management (login records) */ bool cryptpap = 0; /* Passwords in pap-secrets are encrypted */ bool refuse_pap = 0; /* Don't wanna auth. ourselves with PAP */ bool refuse_chap = 0; /* Don't wanna auth. ourselves with CHAP */ bool refuse_eap = 0; /* Don't wanna auth. ourselves with EAP */ #if MSCHAP_SUPPORT bool refuse_mschap = 0; /* Don't wanna auth. ourselves with MS-CHAP */ bool refuse_mschap_v2 = 0; /* Don't wanna auth. ourselves with MS-CHAPv2 */ #else /* MSCHAP_SUPPORT */ bool refuse_mschap = 1; /* Don't wanna auth. ourselves with MS-CHAP */ bool refuse_mschap_v2 = 1; /* Don't wanna auth. ourselves with MS-CHAPv2 */ #endif /* MSCHAP_SUPPORT */ bool usehostname = 0; /* Use hostname for our_name */ bool auth_required = 0; /* Always require authentication from peer */ bool allow_any_ip = 0; /* Allow peer to use any IP address */ bool explicit_remote = 0; /* User specified explicit remote name */ bool explicit_user = 0; /* Set if "user" option supplied */ bool explicit_passwd = 0; /* Set if "password" option supplied */ char remote_name[MAXNAMELEN]; /* Peer's name for authentication */ static char *uafname; /* name of most recent +ua file */ extern char *crypt (const char *, const char *); #endif /* UNUSED */ /* Prototypes for procedures local to this file. */ static void network_phase(ppp_pcb *pcb); #if PPP_IDLETIMELIMIT static void check_idle(void *arg); #endif /* PPP_IDLETIMELIMIT */ #if PPP_MAXCONNECT static void connect_time_expired(void *arg); #endif /* PPP_MAXCONNECT */ #if 0 /* UNUSED */ static int null_login (int); /* static int get_pap_passwd (char *); */ static int have_pap_secret (int *); static int have_chap_secret (char *, char *, int, int *); static int have_srp_secret (char *client, char *server, int need_ip, int *lacks_ipp); static int ip_addr_check (u32_t, struct permitted_ip *); static int scan_authfile (FILE *, char *, char *, char *, struct wordlist **, struct wordlist **, char *, int); static void free_wordlist (struct wordlist *); static void set_allowed_addrs (int, struct wordlist *, struct wordlist *); static int some_ip_ok (struct wordlist *); static int setupapfile (char **); static int privgroup (char **); static int set_noauth_addr (char **); static int set_permitted_number (char **); static void check_access (FILE *, char *); static int wordlist_count (struct wordlist *); #endif /* UNUSED */ #ifdef MAXOCTETS static void check_maxoctets (void *); #endif #if PPP_OPTIONS /* * Authentication-related options. */ option_t auth_options[] = { { "auth", o_bool, &auth_required, "Require authentication from peer", OPT_PRIO | 1 }, { "noauth", o_bool, &auth_required, "Don't require peer to authenticate", OPT_PRIOSUB | OPT_PRIV, &allow_any_ip }, { "require-pap", o_bool, &lcp_wantoptions[0].neg_upap, "Require PAP authentication from peer", OPT_PRIOSUB | 1, &auth_required }, { "+pap", o_bool, &lcp_wantoptions[0].neg_upap, "Require PAP authentication from peer", OPT_ALIAS | OPT_PRIOSUB | 1, &auth_required }, { "require-chap", o_bool, &auth_required, "Require CHAP authentication from peer", OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5, &lcp_wantoptions[0].chap_mdtype }, { "+chap", o_bool, &auth_required, "Require CHAP authentication from peer", OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5, &lcp_wantoptions[0].chap_mdtype }, #if MSCHAP_SUPPORT { "require-mschap", o_bool, &auth_required, "Require MS-CHAP authentication from peer", OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT, &lcp_wantoptions[0].chap_mdtype }, { "+mschap", o_bool, &auth_required, "Require MS-CHAP authentication from peer", OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT, &lcp_wantoptions[0].chap_mdtype }, { "require-mschap-v2", o_bool, &auth_required, "Require MS-CHAPv2 authentication from peer", OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2, &lcp_wantoptions[0].chap_mdtype }, { "+mschap-v2", o_bool, &auth_required, "Require MS-CHAPv2 authentication from peer", OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2, &lcp_wantoptions[0].chap_mdtype }, #endif /* MSCHAP_SUPPORT */ #if 0 { "refuse-pap", o_bool, &refuse_pap, "Don't agree to auth to peer with PAP", 1 }, { "-pap", o_bool, &refuse_pap, "Don't allow PAP authentication with peer", OPT_ALIAS | 1 }, { "refuse-chap", o_bool, &refuse_chap, "Don't agree to auth to peer with CHAP", OPT_A2CLRB | MDTYPE_MD5, &lcp_allowoptions[0].chap_mdtype }, { "-chap", o_bool, &refuse_chap, "Don't allow CHAP authentication with peer", OPT_ALIAS | OPT_A2CLRB | MDTYPE_MD5, &lcp_allowoptions[0].chap_mdtype }, #endif #if MSCHAP_SUPPORT #if 0 { "refuse-mschap", o_bool, &refuse_mschap, "Don't agree to auth to peer with MS-CHAP", OPT_A2CLRB | MDTYPE_MICROSOFT, &lcp_allowoptions[0].chap_mdtype }, { "-mschap", o_bool, &refuse_mschap, "Don't allow MS-CHAP authentication with peer", OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT, &lcp_allowoptions[0].chap_mdtype }, { "refuse-mschap-v2", o_bool, &refuse_mschap_v2, "Don't agree to auth to peer with MS-CHAPv2", OPT_A2CLRB | MDTYPE_MICROSOFT_V2, &lcp_allowoptions[0].chap_mdtype }, { "-mschap-v2", o_bool, &refuse_mschap_v2, "Don't allow MS-CHAPv2 authentication with peer", OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT_V2, &lcp_allowoptions[0].chap_mdtype }, #endif #endif /* MSCHAP_SUPPORT*/ #if EAP_SUPPORT { "require-eap", o_bool, &lcp_wantoptions[0].neg_eap, "Require EAP authentication from peer", OPT_PRIOSUB | 1, &auth_required }, #if 0 { "refuse-eap", o_bool, &refuse_eap, "Don't agree to authenticate to peer with EAP", 1 }, #endif #endif /* EAP_SUPPORT */ { "name", o_string, our_name, "Set local name for authentication", OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXNAMELEN }, { "+ua", o_special, (void *)setupapfile, "Get PAP user and password from file", OPT_PRIO | OPT_A2STRVAL, &uafname }, #if 0 { "user", o_string, user, "Set name for auth with peer", OPT_PRIO | OPT_STATIC, &explicit_user, MAXNAMELEN }, { "password", o_string, passwd, "Password for authenticating us to the peer", OPT_PRIO | OPT_STATIC | OPT_HIDE, &explicit_passwd, MAXSECRETLEN }, #endif { "usehostname", o_bool, &usehostname, "Must use hostname for authentication", 1 }, { "remotename", o_string, remote_name, "Set remote name for authentication", OPT_PRIO | OPT_STATIC, &explicit_remote, MAXNAMELEN }, { "login", o_bool, &uselogin, "Use system password database for PAP", OPT_A2COPY | 1 , &session_mgmt }, { "enable-session", o_bool, &session_mgmt, "Enable session accounting for remote peers", OPT_PRIV | 1 }, { "papcrypt", o_bool, &cryptpap, "PAP passwords are encrypted", 1 }, { "privgroup", o_special, (void *)privgroup, "Allow group members to use privileged options", OPT_PRIV | OPT_A2LIST }, { "allow-ip", o_special, (void *)set_noauth_addr, "Set IP address(es) which can be used without authentication", OPT_PRIV | OPT_A2LIST }, { "remotenumber", o_string, remote_number, "Set remote telephone number for authentication", OPT_PRIO | OPT_STATIC, NULL, MAXNAMELEN }, { "allow-number", o_special, (void *)set_permitted_number, "Set telephone number(s) which are allowed to connect", OPT_PRIV | OPT_A2LIST }, { NULL } }; #endif /* PPP_OPTIONS */ #if 0 /* UNUSED */ /* * setupapfile - specifies UPAP info for authenticating with peer. */ static int setupapfile(argv) char **argv; { FILE *ufile; int l; uid_t euid; char u[MAXNAMELEN], p[MAXSECRETLEN]; char *fname; lcp_allowoptions[0].neg_upap = 1; /* open user info file */ fname = strdup(*argv); if (fname == NULL) novm("+ua file name"); euid = geteuid(); if (seteuid(getuid()) == -1) { option_error("unable to reset uid before opening %s: %m", fname); return 0; } ufile = fopen(fname, "r"); if (seteuid(euid) == -1) fatal("unable to regain privileges: %m"); if (ufile == NULL) { option_error("unable to open user login data file %s", fname); return 0; } check_access(ufile, fname); uafname = fname; /* get username */ if (fgets(u, MAXNAMELEN - 1, ufile) == NULL || fgets(p, MAXSECRETLEN - 1, ufile) == NULL) { fclose(ufile); option_error("unable to read user login data file %s", fname); return 0; } fclose(ufile); /* get rid of newlines */ l = strlen(u); if (l > 0 && u[l-1] == '\n') u[l-1] = 0; l = strlen(p); if (l > 0 && p[l-1] == '\n') p[l-1] = 0; if (override_value("user", option_priority, fname)) { strlcpy(ppp_settings.user, u, sizeof(ppp_settings.user)); explicit_user = 1; } if (override_value("passwd", option_priority, fname)) { strlcpy(ppp_settings.passwd, p, sizeof(ppp_settings.passwd)); explicit_passwd = 1; } return (1); } /* * privgroup - allow members of the group to have privileged access. */ static int privgroup(argv) char **argv; { struct group *g; int i; g = getgrnam(*argv); if (g == 0) { option_error("group %s is unknown", *argv); return 0; } for (i = 0; i < ngroups; ++i) { if (groups[i] == g->gr_gid) { privileged = 1; break; } } return 1; } /* * set_noauth_addr - set address(es) that can be used without authentication. * Equivalent to specifying an entry like `"" * "" addr' in pap-secrets. */ static int set_noauth_addr(argv) char **argv; { char *addr = *argv; int l = strlen(addr) + 1; struct wordlist *wp; wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l); if (wp == NULL) novm("allow-ip argument"); wp->word = (char *) (wp + 1); wp->next = noauth_addrs; MEMCPY(wp->word, addr, l); noauth_addrs = wp; return 1; } /* * set_permitted_number - set remote telephone number(s) that may connect. */ static int set_permitted_number(argv) char **argv; { char *number = *argv; int l = strlen(number) + 1; struct wordlist *wp; wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l); if (wp == NULL) novm("allow-number argument"); wp->word = (char *) (wp + 1); wp->next = permitted_numbers; MEMCPY(wp->word, number, l); permitted_numbers = wp; return 1; } #endif /* * An Open on LCP has requested a change from Dead to Establish phase. */ void link_required(ppp_pcb *pcb) { LWIP_UNUSED_ARG(pcb); } #if 0 /* * Bring the link up to the point of being able to do ppp. */ void start_link(unit) int unit; { ppp_pcb *pcb = &ppp_pcb_list[unit]; char *msg; status = EXIT_NEGOTIATION_FAILED; new_phase(pcb, PPP_PHASE_SERIALCONN); hungup = 0; devfd = the_channel->connect(); msg = "Connect script failed"; if (devfd < 0) goto fail; /* set up the serial device as a ppp interface */ /* * N.B. we used to do tdb_writelock/tdb_writeunlock around this * (from establish_ppp to set_ifunit). However, we won't be * doing the set_ifunit in multilink mode, which is the only time * we need the atomicity that the tdb_writelock/tdb_writeunlock * gives us. Thus we don't need the tdb_writelock/tdb_writeunlock. */ fd_ppp = the_channel->establish_ppp(devfd); msg = "ppp establishment failed"; if (fd_ppp < 0) { status = EXIT_FATAL_ERROR; goto disconnect; } if (!demand && ifunit >= 0) set_ifunit(1); /* * Start opening the connection and wait for * incoming events (reply, timeout, etc.). */ if (ifunit >= 0) ppp_notice("Connect: %s <--> %s", ifname, ppp_devnam); else ppp_notice("Starting negotiation on %s", ppp_devnam); add_fd(fd_ppp); new_phase(pcb, PPP_PHASE_ESTABLISH); lcp_lowerup(pcb); return; disconnect: new_phase(pcb, PPP_PHASE_DISCONNECT); if (the_channel->disconnect) the_channel->disconnect(); fail: new_phase(pcb, PPP_PHASE_DEAD); if (the_channel->cleanup) (*the_channel->cleanup)(); } #endif /* * LCP has terminated the link; go to the Dead phase and take the * physical layer down. */ void link_terminated(ppp_pcb *pcb) { if (pcb->phase == PPP_PHASE_DEAD #ifdef HAVE_MULTILINK || pcb->phase == PPP_PHASE_MASTER #endif /* HAVE_MULTILINK */ ) return; new_phase(pcb, PPP_PHASE_DISCONNECT); #if 0 /* UNUSED */ if (pap_logout_hook) { pap_logout_hook(); } session_end(devnam); #endif /* UNUSED */ if (!doing_multilink) { ppp_notice("Connection terminated."); #if PPP_STATS_SUPPORT print_link_stats(); #endif /* PPP_STATS_SUPPORT */ } else ppp_notice("Link terminated."); lcp_lowerdown(pcb); ppp_link_terminated(pcb); #if 0 /* * Delete pid files before disestablishing ppp. Otherwise it * can happen that another pppd gets the same unit and then * we delete its pid file. */ if (!doing_multilink && !demand) remove_pidfiles(); /* * If we may want to bring the link up again, transfer * the ppp unit back to the loopback. Set the * real serial device back to its normal mode of operation. */ if (fd_ppp >= 0) { remove_fd(fd_ppp); clean_check(); the_channel->disestablish_ppp(devfd); if (doing_multilink) mp_exit_bundle(); fd_ppp = -1; } if (!hungup) lcp_lowerdown(pcb); if (!doing_multilink && !demand) script_unsetenv("IFNAME"); /* * Run disconnector script, if requested. * XXX we may not be able to do this if the line has hung up! */ if (devfd >= 0 && the_channel->disconnect) { the_channel->disconnect(); devfd = -1; } if (the_channel->cleanup) (*the_channel->cleanup)(); if (doing_multilink && multilink_master) { if (!bundle_terminating) new_phase(pcb, PPP_PHASE_MASTER); else mp_bundle_terminated(); } else new_phase(pcb, PPP_PHASE_DEAD); #endif } /* * LCP has gone down; it will either die or try to re-establish. */ void link_down(ppp_pcb *pcb) { #if PPP_NOTIFY notify(link_down_notifier, 0); #endif /* PPP_NOTIFY */ if (!doing_multilink) { upper_layers_down(pcb); if (pcb->phase != PPP_PHASE_DEAD #ifdef HAVE_MULTILINK && pcb->phase != PPP_PHASE_MASTER #endif /* HAVE_MULTILINK */ ) new_phase(pcb, PPP_PHASE_ESTABLISH); } /* XXX if doing_multilink, should do something to stop network-layer traffic on the link */ } void upper_layers_down(ppp_pcb *pcb) { int i; const struct protent *protp; for (i = 0; (protp = protocols[i]) != NULL; ++i) { if (protp->protocol != PPP_LCP && protp->lowerdown != NULL) (*protp->lowerdown)(pcb); if (protp->protocol < 0xC000 && protp->close != NULL) (*protp->close)(pcb, "LCP down"); } pcb->num_np_open = 0; pcb->num_np_up = 0; } /* * The link is established. * Proceed to the Dead, Authenticate or Network phase as appropriate. */ void link_established(ppp_pcb *pcb) { #if PPP_AUTH_SUPPORT int auth; #if PPP_SERVER #if PAP_SUPPORT lcp_options *wo = &pcb->lcp_wantoptions; #endif /* PAP_SUPPORT */ lcp_options *go = &pcb->lcp_gotoptions; #endif /* PPP_SERVER */ lcp_options *ho = &pcb->lcp_hisoptions; #endif /* PPP_AUTH_SUPPORT */ int i; const struct protent *protp; /* * Tell higher-level protocols that LCP is up. */ if (!doing_multilink) { for (i = 0; (protp = protocols[i]) != NULL; ++i) if (protp->protocol != PPP_LCP && protp->lowerup != NULL) (*protp->lowerup)(pcb); } #if PPP_AUTH_SUPPORT #if PPP_SERVER #if PPP_ALLOWED_ADDRS if (!auth_required && noauth_addrs != NULL) set_allowed_addrs(unit, NULL, NULL); #endif /* PPP_ALLOWED_ADDRS */ if (pcb->settings.auth_required && !(0 #if PAP_SUPPORT || go->neg_upap #endif /* PAP_SUPPORT */ #if CHAP_SUPPORT || go->neg_chap #endif /* CHAP_SUPPORT */ #if EAP_SUPPORT || go->neg_eap #endif /* EAP_SUPPORT */ )) { #if PPP_ALLOWED_ADDRS /* * We wanted the peer to authenticate itself, and it refused: * if we have some address(es) it can use without auth, fine, * otherwise treat it as though it authenticated with PAP using * a username of "" and a password of "". If that's not OK, * boot it out. */ if (noauth_addrs != NULL) { set_allowed_addrs(unit, NULL, NULL); } else #endif /* PPP_ALLOWED_ADDRS */ if (!pcb->settings.null_login #if PAP_SUPPORT || !wo->neg_upap #endif /* PAP_SUPPORT */ ) { ppp_warn("peer refused to authenticate: terminating link"); #if 0 /* UNUSED */ status = EXIT_PEER_AUTH_FAILED; #endif /* UNUSED */ pcb->err_code = PPPERR_AUTHFAIL; lcp_close(pcb, "peer refused to authenticate"); return; } } #endif /* PPP_SERVER */ new_phase(pcb, PPP_PHASE_AUTHENTICATE); auth = 0; #if PPP_SERVER #if EAP_SUPPORT if (go->neg_eap) { eap_authpeer(pcb, PPP_OUR_NAME); auth |= EAP_PEER; } else #endif /* EAP_SUPPORT */ #if CHAP_SUPPORT if (go->neg_chap) { chap_auth_peer(pcb, PPP_OUR_NAME, CHAP_DIGEST(go->chap_mdtype)); auth |= CHAP_PEER; } else #endif /* CHAP_SUPPORT */ #if PAP_SUPPORT if (go->neg_upap) { upap_authpeer(pcb); auth |= PAP_PEER; } else #endif /* PAP_SUPPORT */ {} #endif /* PPP_SERVER */ #if EAP_SUPPORT if (ho->neg_eap) { eap_authwithpeer(pcb, pcb->settings.user); auth |= EAP_WITHPEER; } else #endif /* EAP_SUPPORT */ #if CHAP_SUPPORT if (ho->neg_chap) { chap_auth_with_peer(pcb, pcb->settings.user, CHAP_DIGEST(ho->chap_mdtype)); auth |= CHAP_WITHPEER; } else #endif /* CHAP_SUPPORT */ #if PAP_SUPPORT if (ho->neg_upap) { upap_authwithpeer(pcb, pcb->settings.user, pcb->settings.passwd); auth |= PAP_WITHPEER; } else #endif /* PAP_SUPPORT */ {} pcb->auth_pending = auth; pcb->auth_done = 0; if (!auth) #endif /* PPP_AUTH_SUPPORT */ network_phase(pcb); } /* * Proceed to the network phase. */ static void network_phase(ppp_pcb *pcb) { #if CBCP_SUPPORT ppp_pcb *pcb = &ppp_pcb_list[unit]; #endif #if 0 /* UNUSED */ lcp_options *go = &lcp_gotoptions[unit]; #endif /* UNUSED */ #if 0 /* UNUSED */ /* Log calling number. */ if (*remote_number) ppp_notice("peer from calling number %q authorized", remote_number); #endif /* UNUSED */ #if PPP_NOTIFY /* * If the peer had to authenticate, notify it now. */ if (0 #if CHAP_SUPPORT || go->neg_chap #endif /* CHAP_SUPPORT */ #if PAP_SUPPORT || go->neg_upap #endif /* PAP_SUPPORT */ #if EAP_SUPPORT || go->neg_eap #endif /* EAP_SUPPORT */ ) { notify(auth_up_notifier, 0); } #endif /* PPP_NOTIFY */ #if CBCP_SUPPORT /* * If we negotiated callback, do it now. */ if (go->neg_cbcp) { new_phase(pcb, PPP_PHASE_CALLBACK); (*cbcp_protent.open)(pcb); return; } #endif #if PPP_OPTIONS /* * Process extra options from the secrets file */ if (extra_options) { options_from_list(extra_options, 1); free_wordlist(extra_options); extra_options = 0; } #endif /* PPP_OPTIONS */ start_networks(pcb); } void start_networks(ppp_pcb *pcb) { #if CCP_SUPPORT || ECP_SUPPORT int i; const struct protent *protp; #endif /* CCP_SUPPORT || ECP_SUPPORT */ new_phase(pcb, PPP_PHASE_NETWORK); #ifdef HAVE_MULTILINK if (multilink) { if (mp_join_bundle()) { if (multilink_join_hook) (*multilink_join_hook)(); if (updetach && !nodetach) detach(); return; } } #endif /* HAVE_MULTILINK */ #ifdef PPP_FILTER if (!demand) set_filters(&pass_filter, &active_filter); #endif #if CCP_SUPPORT || ECP_SUPPORT /* Start CCP and ECP */ for (i = 0; (protp = protocols[i]) != NULL; ++i) if ( (0 #if ECP_SUPPORT || protp->protocol == PPP_ECP #endif /* ECP_SUPPORT */ #if CCP_SUPPORT || protp->protocol == PPP_CCP #endif /* CCP_SUPPORT */ ) && protp->open != NULL) (*protp->open)(pcb); #endif /* CCP_SUPPORT || ECP_SUPPORT */ /* * Bring up other network protocols iff encryption is not required. */ if (1 #if ECP_SUPPORT && !ecp_gotoptions[unit].required #endif /* ECP_SUPPORT */ #if MPPE_SUPPORT && !pcb->ccp_gotoptions.mppe #endif /* MPPE_SUPPORT */ ) continue_networks(pcb); } void continue_networks(ppp_pcb *pcb) { int i; const struct protent *protp; /* * Start the "real" network protocols. */ for (i = 0; (protp = protocols[i]) != NULL; ++i) if (protp->protocol < 0xC000 #if CCP_SUPPORT && protp->protocol != PPP_CCP #endif /* CCP_SUPPORT */ #if ECP_SUPPORT && protp->protocol != PPP_ECP #endif /* ECP_SUPPORT */ && protp->open != NULL) { (*protp->open)(pcb); ++pcb->num_np_open; } if (pcb->num_np_open == 0) /* nothing to do */ lcp_close(pcb, "No network protocols running"); } #if PPP_AUTH_SUPPORT #if PPP_SERVER /* * auth_check_passwd - Check the user name and passwd against configuration. * * returns: * 0: Authentication failed. * 1: Authentication succeeded. * In either case, msg points to an appropriate message and msglen to the message len. */ int auth_check_passwd(ppp_pcb *pcb, char *auser, int userlen, char *apasswd, int passwdlen, const char **msg, int *msglen) { int secretuserlen; int secretpasswdlen; if (pcb->settings.user && pcb->settings.passwd) { secretuserlen = (int)strlen(pcb->settings.user); secretpasswdlen = (int)strlen(pcb->settings.passwd); if (secretuserlen == userlen && secretpasswdlen == passwdlen && !memcmp(auser, pcb->settings.user, userlen) && !memcmp(apasswd, pcb->settings.passwd, passwdlen) ) { *msg = "Login ok"; *msglen = sizeof("Login ok")-1; return 1; } } *msg = "Login incorrect"; *msglen = sizeof("Login incorrect")-1; return 0; } /* * The peer has failed to authenticate himself using `protocol'. */ void auth_peer_fail(ppp_pcb *pcb, int protocol) { LWIP_UNUSED_ARG(protocol); /* * Authentication failure: take the link down */ #if 0 /* UNUSED */ status = EXIT_PEER_AUTH_FAILED; #endif /* UNUSED */ pcb->err_code = PPPERR_AUTHFAIL; lcp_close(pcb, "Authentication failed"); } /* * The peer has been successfully authenticated using `protocol'. */ void auth_peer_success(ppp_pcb *pcb, int protocol, int prot_flavor, const char *name, int namelen) { int bit; #ifndef HAVE_MULTILINK LWIP_UNUSED_ARG(name); LWIP_UNUSED_ARG(namelen); #endif /* HAVE_MULTILINK */ switch (protocol) { #if CHAP_SUPPORT case PPP_CHAP: bit = CHAP_PEER; switch (prot_flavor) { case CHAP_MD5: bit |= CHAP_MD5_PEER; break; #if MSCHAP_SUPPORT case CHAP_MICROSOFT: bit |= CHAP_MS_PEER; break; case CHAP_MICROSOFT_V2: bit |= CHAP_MS2_PEER; break; #endif /* MSCHAP_SUPPORT */ default: break; } break; #endif /* CHAP_SUPPORT */ #if PAP_SUPPORT case PPP_PAP: bit = PAP_PEER; break; #endif /* PAP_SUPPORT */ #if EAP_SUPPORT case PPP_EAP: bit = EAP_PEER; break; #endif /* EAP_SUPPORT */ default: ppp_warn("auth_peer_success: unknown protocol %x", protocol); return; } #ifdef HAVE_MULTILINK /* * Save the authenticated name of the peer for later. */ if (namelen > (int)sizeof(pcb->peer_authname) - 1) namelen = (int)sizeof(pcb->peer_authname) - 1; MEMCPY(pcb->peer_authname, name, namelen); pcb->peer_authname[namelen] = 0; #endif /* HAVE_MULTILINK */ #if 0 /* UNUSED */ script_setenv("PEERNAME", , 0); #endif /* UNUSED */ /* Save the authentication method for later. */ pcb->auth_done |= bit; /* * If there is no more authentication still to be done, * proceed to the network (or callback) phase. */ if ((pcb->auth_pending &= ~bit) == 0) network_phase(pcb); } #endif /* PPP_SERVER */ /* * We have failed to authenticate ourselves to the peer using `protocol'. */ void auth_withpeer_fail(ppp_pcb *pcb, int protocol) { LWIP_UNUSED_ARG(protocol); /* * We've failed to authenticate ourselves to our peer. * * Some servers keep sending CHAP challenges, but there * is no point in persisting without any way to get updated * authentication secrets. * * He'll probably take the link down, and there's not much * we can do except wait for that. */ pcb->err_code = PPPERR_AUTHFAIL; lcp_close(pcb, "Failed to authenticate ourselves to peer"); } /* * We have successfully authenticated ourselves with the peer using `protocol'. */ void auth_withpeer_success(ppp_pcb *pcb, int protocol, int prot_flavor) { int bit; const char *prot = ""; switch (protocol) { #if CHAP_SUPPORT case PPP_CHAP: bit = CHAP_WITHPEER; prot = "CHAP"; switch (prot_flavor) { case CHAP_MD5: bit |= CHAP_MD5_WITHPEER; break; #if MSCHAP_SUPPORT case CHAP_MICROSOFT: bit |= CHAP_MS_WITHPEER; break; case CHAP_MICROSOFT_V2: bit |= CHAP_MS2_WITHPEER; break; #endif /* MSCHAP_SUPPORT */ default: break; } break; #endif /* CHAP_SUPPORT */ #if PAP_SUPPORT case PPP_PAP: bit = PAP_WITHPEER; prot = "PAP"; break; #endif /* PAP_SUPPORT */ #if EAP_SUPPORT case PPP_EAP: bit = EAP_WITHPEER; prot = "EAP"; break; #endif /* EAP_SUPPORT */ default: ppp_warn("auth_withpeer_success: unknown protocol %x", protocol); bit = 0; /* no break */ } ppp_notice("%s authentication succeeded", prot); /* Save the authentication method for later. */ pcb->auth_done |= bit; /* * If there is no more authentication still being done, * proceed to the network (or callback) phase. */ if ((pcb->auth_pending &= ~bit) == 0) network_phase(pcb); } #endif /* PPP_AUTH_SUPPORT */ /* * np_up - a network protocol has come up. */ void np_up(ppp_pcb *pcb, int proto) { #if PPP_IDLETIMELIMIT int tlim; #endif /* PPP_IDLETIMELIMIT */ LWIP_UNUSED_ARG(proto); if (pcb->num_np_up == 0) { /* * At this point we consider that the link has come up successfully. */ new_phase(pcb, PPP_PHASE_RUNNING); #if PPP_IDLETIMELIMIT #if 0 /* UNUSED */ if (idle_time_hook != 0) tlim = (*idle_time_hook)(NULL); else #endif /* UNUSED */ tlim = pcb->settings.idle_time_limit; if (tlim > 0) TIMEOUT(check_idle, (void*)pcb, tlim); #endif /* PPP_IDLETIMELIMIT */ #if PPP_MAXCONNECT /* * Set a timeout to close the connection once the maximum * connect time has expired. */ if (pcb->settings.maxconnect > 0) TIMEOUT(connect_time_expired, (void*)pcb, pcb->settings.maxconnect); #endif /* PPP_MAXCONNECT */ #ifdef MAXOCTETS if (maxoctets > 0) TIMEOUT(check_maxoctets, NULL, maxoctets_timeout); #endif #if 0 /* Unused */ /* * Detach now, if the updetach option was given. */ if (updetach && !nodetach) detach(); #endif /* Unused */ } ++pcb->num_np_up; } /* * np_down - a network protocol has gone down. */ void np_down(ppp_pcb *pcb, int proto) { LWIP_UNUSED_ARG(proto); if (--pcb->num_np_up == 0) { #if PPP_IDLETIMELIMIT UNTIMEOUT(check_idle, (void*)pcb); #endif /* PPP_IDLETIMELIMIT */ #if PPP_MAXCONNECT UNTIMEOUT(connect_time_expired, NULL); #endif /* PPP_MAXCONNECT */ #ifdef MAXOCTETS UNTIMEOUT(check_maxoctets, NULL); #endif new_phase(pcb, PPP_PHASE_NETWORK); } } /* * np_finished - a network protocol has finished using the link. */ void np_finished(ppp_pcb *pcb, int proto) { LWIP_UNUSED_ARG(proto); if (--pcb->num_np_open <= 0) { /* no further use for the link: shut up shop. */ lcp_close(pcb, "No network protocols running"); } } #ifdef MAXOCTETS static void check_maxoctets(arg) void *arg; { #if PPP_STATS_SUPPORT unsigned int used; update_link_stats(ifunit); link_stats_valid=0; switch(maxoctets_dir) { case PPP_OCTETS_DIRECTION_IN: used = link_stats.bytes_in; break; case PPP_OCTETS_DIRECTION_OUT: used = link_stats.bytes_out; break; case PPP_OCTETS_DIRECTION_MAXOVERAL: case PPP_OCTETS_DIRECTION_MAXSESSION: used = (link_stats.bytes_in > link_stats.bytes_out) ? link_stats.bytes_in : link_stats.bytes_out; break; default: used = link_stats.bytes_in+link_stats.bytes_out; break; } if (used > maxoctets) { ppp_notice("Traffic limit reached. Limit: %u Used: %u", maxoctets, used); status = EXIT_TRAFFIC_LIMIT; lcp_close(pcb, "Traffic limit"); #if 0 /* UNUSED */ need_holdoff = 0; #endif /* UNUSED */ } else { TIMEOUT(check_maxoctets, NULL, maxoctets_timeout); } #endif /* PPP_STATS_SUPPORT */ } #endif /* MAXOCTETS */ #if PPP_IDLETIMELIMIT /* * check_idle - check whether the link has been idle for long * enough that we can shut it down. */ static void check_idle(void *arg) { ppp_pcb *pcb = (ppp_pcb*)arg; struct ppp_idle idle; time_t itime; int tlim; if (!get_idle_time(pcb, &idle)) return; #if 0 /* UNUSED */ if (idle_time_hook != 0) { tlim = idle_time_hook(&idle); } else { #endif /* UNUSED */ itime = LWIP_MIN(idle.xmit_idle, idle.recv_idle); tlim = pcb->settings.idle_time_limit - itime; #if 0 /* UNUSED */ } #endif /* UNUSED */ if (tlim <= 0) { /* link is idle: shut it down. */ ppp_notice("Terminating connection due to lack of activity."); pcb->err_code = PPPERR_IDLETIMEOUT; lcp_close(pcb, "Link inactive"); #if 0 /* UNUSED */ need_holdoff = 0; #endif /* UNUSED */ } else { TIMEOUT(check_idle, (void*)pcb, tlim); } } #endif /* PPP_IDLETIMELIMIT */ #if PPP_MAXCONNECT /* * connect_time_expired - log a message and close the connection. */ static void connect_time_expired(void *arg) { ppp_pcb *pcb = (ppp_pcb*)arg; ppp_info("Connect time expired"); pcb->err_code = PPPERR_CONNECTTIME; lcp_close(pcb, "Connect time expired"); /* Close connection */ } #endif /* PPP_MAXCONNECT */ #if PPP_OPTIONS /* * auth_check_options - called to check authentication options. */ void auth_check_options() { lcp_options *wo = &lcp_wantoptions[0]; int can_auth; int lacks_ip; /* Default our_name to hostname, and user to our_name */ if (our_name[0] == 0 || usehostname) strlcpy(our_name, hostname, sizeof(our_name)); /* If a blank username was explicitly given as an option, trust the user and don't use our_name */ if (ppp_settings.user[0] == 0 && !explicit_user) strlcpy(ppp_settings.user, our_name, sizeof(ppp_settings.user)); /* * If we have a default route, require the peer to authenticate * unless the noauth option was given or the real user is root. */ if (!auth_required && !allow_any_ip && have_route_to(0) && !privileged) { auth_required = 1; default_auth = 1; } #if CHAP_SUPPORT /* If we selected any CHAP flavors, we should probably negotiate it. :-) */ if (wo->chap_mdtype) wo->neg_chap = 1; #endif /* CHAP_SUPPORT */ /* If authentication is required, ask peer for CHAP, PAP, or EAP. */ if (auth_required) { allow_any_ip = 0; if (1 #if CHAP_SUPPORT && !wo->neg_chap #endif /* CHAP_SUPPORT */ #if PAP_SUPPORT && !wo->neg_upap #endif /* PAP_SUPPORT */ #if EAP_SUPPORT && !wo->neg_eap #endif /* EAP_SUPPORT */ ) { #if CHAP_SUPPORT wo->neg_chap = CHAP_MDTYPE_SUPPORTED != MDTYPE_NONE; wo->chap_mdtype = CHAP_MDTYPE_SUPPORTED; #endif /* CHAP_SUPPORT */ #if PAP_SUPPORT wo->neg_upap = 1; #endif /* PAP_SUPPORT */ #if EAP_SUPPORT wo->neg_eap = 1; #endif /* EAP_SUPPORT */ } } else { #if CHAP_SUPPORT wo->neg_chap = 0; wo->chap_mdtype = MDTYPE_NONE; #endif /* CHAP_SUPPORT */ #if PAP_SUPPORT wo->neg_upap = 0; #endif /* PAP_SUPPORT */ #if EAP_SUPPORT wo->neg_eap = 0; #endif /* EAP_SUPPORT */ } /* * Check whether we have appropriate secrets to use * to authenticate the peer. Note that EAP can authenticate by way * of a CHAP-like exchanges as well as SRP. */ lacks_ip = 0; #if PAP_SUPPORT can_auth = wo->neg_upap && (uselogin || have_pap_secret(&lacks_ip)); #else can_auth = 0; #endif /* PAP_SUPPORT */ if (!can_auth && (0 #if CHAP_SUPPORT || wo->neg_chap #endif /* CHAP_SUPPORT */ #if EAP_SUPPORT || wo->neg_eap #endif /* EAP_SUPPORT */ )) { #if CHAP_SUPPORT can_auth = have_chap_secret((explicit_remote? remote_name: NULL), our_name, 1, &lacks_ip); #else can_auth = 0; #endif } if (!can_auth #if EAP_SUPPORT && wo->neg_eap #endif /* EAP_SUPPORT */ ) { can_auth = have_srp_secret((explicit_remote? remote_name: NULL), our_name, 1, &lacks_ip); } if (auth_required && !can_auth && noauth_addrs == NULL) { if (default_auth) { option_error( "By default the remote system is required to authenticate itself"); option_error( "(because this system has a default route to the internet)"); } else if (explicit_remote) option_error( "The remote system (%s) is required to authenticate itself", remote_name); else option_error( "The remote system is required to authenticate itself"); option_error( "but I couldn't find any suitable secret (password) for it to use to do so."); if (lacks_ip) option_error( "(None of the available passwords would let it use an IP address.)"); exit(1); } /* * Early check for remote number authorization. */ if (!auth_number()) { ppp_warn("calling number %q is not authorized", remote_number); exit(EXIT_CNID_AUTH_FAILED); } } #endif /* PPP_OPTIONS */ #if 0 /* UNUSED */ /* * auth_reset - called when LCP is starting negotiations to recheck * authentication options, i.e. whether we have appropriate secrets * to use for authenticating ourselves and/or the peer. */ void auth_reset(unit) int unit; { lcp_options *go = &lcp_gotoptions[unit]; lcp_options *ao = &lcp_allowoptions[unit]; int hadchap; hadchap = -1; ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL)); ao->neg_chap = (!refuse_chap || !refuse_mschap || !refuse_mschap_v2) && (passwd[0] != 0 || (hadchap = have_chap_secret(user, (explicit_remote? remote_name: NULL), 0, NULL))); ao->neg_eap = !refuse_eap && ( passwd[0] != 0 || (hadchap == 1 || (hadchap == -1 && have_chap_secret(user, (explicit_remote? remote_name: NULL), 0, NULL))) || have_srp_secret(user, (explicit_remote? remote_name: NULL), 0, NULL)); hadchap = -1; if (go->neg_upap && !uselogin && !have_pap_secret(NULL)) go->neg_upap = 0; if (go->neg_chap) { if (!(hadchap = have_chap_secret((explicit_remote? remote_name: NULL), our_name, 1, NULL))) go->neg_chap = 0; } if (go->neg_eap && (hadchap == 0 || (hadchap == -1 && !have_chap_secret((explicit_remote? remote_name: NULL), our_name, 1, NULL))) && !have_srp_secret((explicit_remote? remote_name: NULL), our_name, 1, NULL)) go->neg_eap = 0; } /* * check_passwd - Check the user name and passwd against the PAP secrets * file. If requested, also check against the system password database, * and login the user if OK. * * returns: * UPAP_AUTHNAK: Authentication failed. * UPAP_AUTHACK: Authentication succeeded. * In either case, msg points to an appropriate message. */ int check_passwd(unit, auser, userlen, apasswd, passwdlen, msg) int unit; char *auser; int userlen; char *apasswd; int passwdlen; char **msg; { return UPAP_AUTHNAK; int ret; char *filename; FILE *f; struct wordlist *addrs = NULL, *opts = NULL; char passwd[256], user[256]; char secret[MAXWORDLEN]; static int attempts = 0; /* * Make copies of apasswd and auser, then null-terminate them. * If there are unprintable characters in the password, make * them visible. */ slprintf(ppp_settings.passwd, sizeof(ppp_settings.passwd), "%.*v", passwdlen, apasswd); slprintf(ppp_settings.user, sizeof(ppp_settings.user), "%.*v", userlen, auser); *msg = ""; /* * Check if a plugin wants to handle this. */ if (pap_auth_hook) { ret = (*pap_auth_hook)(ppp_settings.user, ppp_settings.passwd, msg, &addrs, &opts); if (ret >= 0) { /* note: set_allowed_addrs() saves opts (but not addrs): don't free it! */ if (ret) set_allowed_addrs(unit, addrs, opts); else if (opts != 0) free_wordlist(opts); if (addrs != 0) free_wordlist(addrs); BZERO(ppp_settings.passwd, sizeof(ppp_settings.passwd)); return ret? UPAP_AUTHACK: UPAP_AUTHNAK; } } /* * Open the file of pap secrets and scan for a suitable secret * for authenticating this user. */ filename = _PATH_UPAPFILE; addrs = opts = NULL; ret = UPAP_AUTHNAK; f = fopen(filename, "r"); if (f == NULL) { ppp_error("Can't open PAP password file %s: %m", filename); } else { check_access(f, filename); if (scan_authfile(f, ppp_settings.user, our_name, secret, &addrs, &opts, filename, 0) < 0) { ppp_warn("no PAP secret found for %s", user); } else { /* * If the secret is "@login", it means to check * the password against the login database. */ int login_secret = strcmp(secret, "@login") == 0; ret = UPAP_AUTHACK; if (uselogin || login_secret) { /* login option or secret is @login */ if (session_full(ppp_settings.user, ppp_settings.passwd, devnam, msg) == 0) { ret = UPAP_AUTHNAK; } } else if (session_mgmt) { if (session_check(ppp_settings.user, NULL, devnam, NULL) == 0) { ppp_warn("Peer %q failed PAP Session verification", user); ret = UPAP_AUTHNAK; } } if (secret[0] != 0 && !login_secret) { /* password given in pap-secrets - must match */ if ((cryptpap || strcmp(ppp_settings.passwd, secret) != 0) && strcmp(crypt(ppp_settings.passwd, secret), secret) != 0) ret = UPAP_AUTHNAK; } } fclose(f); } if (ret == UPAP_AUTHNAK) { if (**msg == 0) *msg = "Login incorrect"; /* * XXX can we ever get here more than once?? * Frustrate passwd stealer programs. * Allow 10 tries, but start backing off after 3 (stolen from login). * On 10'th, drop the connection. */ if (attempts++ >= 10) { ppp_warn("%d LOGIN FAILURES ON %s, %s", attempts, devnam, user); lcp_close(pcb, "login failed"); } if (attempts > 3) sleep((u_int) (attempts - 3) * 5); if (opts != NULL) free_wordlist(opts); } else { attempts = 0; /* Reset count */ if (**msg == 0) *msg = "Login ok"; set_allowed_addrs(unit, addrs, opts); } if (addrs != NULL) free_wordlist(addrs); BZERO(ppp_settings.passwd, sizeof(ppp_settings.passwd)); BZERO(secret, sizeof(secret)); return ret; } /* * null_login - Check if a username of "" and a password of "" are * acceptable, and iff so, set the list of acceptable IP addresses * and return 1. */ static int null_login(unit) int unit; { char *filename; FILE *f; int i, ret; struct wordlist *addrs, *opts; char secret[MAXWORDLEN]; /* * Check if a plugin wants to handle this. */ ret = -1; if (null_auth_hook) ret = (*null_auth_hook)(&addrs, &opts); /* * Open the file of pap secrets and scan for a suitable secret. */ if (ret <= 0) { filename = _PATH_UPAPFILE; addrs = NULL; f = fopen(filename, "r"); if (f == NULL) return 0; check_access(f, filename); i = scan_authfile(f, "", our_name, secret, &addrs, &opts, filename, 0); ret = i >= 0 && secret[0] == 0; BZERO(secret, sizeof(secret)); fclose(f); } if (ret) set_allowed_addrs(unit, addrs, opts); else if (opts != 0) free_wordlist(opts); if (addrs != 0) free_wordlist(addrs); return ret; } /* * get_pap_passwd - get a password for authenticating ourselves with * our peer using PAP. Returns 1 on success, 0 if no suitable password * could be found. * Assumes passwd points to MAXSECRETLEN bytes of space (if non-null). */ static int get_pap_passwd(passwd) char *passwd; { char *filename; FILE *f; int ret; char secret[MAXWORDLEN]; /* * Check whether a plugin wants to supply this. */ if (pap_passwd_hook) { ret = (*pap_passwd_hook)(ppp_settings,user, ppp_settings.passwd); if (ret >= 0) return ret; } filename = _PATH_UPAPFILE; f = fopen(filename, "r"); if (f == NULL) return 0; check_access(f, filename); ret = scan_authfile(f, user, (remote_name[0]? remote_name: NULL), secret, NULL, NULL, filename, 0); fclose(f); if (ret < 0) return 0; if (passwd != NULL) strlcpy(passwd, secret, MAXSECRETLEN); BZERO(secret, sizeof(secret)); return 1; } /* * have_pap_secret - check whether we have a PAP file with any * secrets that we could possibly use for authenticating the peer. */ static int have_pap_secret(lacks_ipp) int *lacks_ipp; { FILE *f; int ret; char *filename; struct wordlist *addrs; /* let the plugin decide, if there is one */ if (pap_check_hook) { ret = (*pap_check_hook)(); if (ret >= 0) return ret; } filename = _PATH_UPAPFILE; f = fopen(filename, "r"); if (f == NULL) return 0; ret = scan_authfile(f, (explicit_remote? remote_name: NULL), our_name, NULL, &addrs, NULL, filename, 0); fclose(f); if (ret >= 0 && !some_ip_ok(addrs)) { if (lacks_ipp != 0) *lacks_ipp = 1; ret = -1; } if (addrs != 0) free_wordlist(addrs); return ret >= 0; } /* * have_chap_secret - check whether we have a CHAP file with a * secret that we could possibly use for authenticating `client' * on `server'. Either can be the null string, meaning we don't * know the identity yet. */ static int have_chap_secret(client, server, need_ip, lacks_ipp) char *client; char *server; int need_ip; int *lacks_ipp; { FILE *f; int ret; char *filename; struct wordlist *addrs; if (chap_check_hook) { ret = (*chap_check_hook)(); if (ret >= 0) { return ret; } } filename = _PATH_CHAPFILE; f = fopen(filename, "r"); if (f == NULL) return 0; if (client != NULL && client[0] == 0) client = NULL; else if (server != NULL && server[0] == 0) server = NULL; ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0); fclose(f); if (ret >= 0 && need_ip && !some_ip_ok(addrs)) { if (lacks_ipp != 0) *lacks_ipp = 1; ret = -1; } if (addrs != 0) free_wordlist(addrs); return ret >= 0; } /* * have_srp_secret - check whether we have a SRP file with a * secret that we could possibly use for authenticating `client' * on `server'. Either can be the null string, meaning we don't * know the identity yet. */ static int have_srp_secret(client, server, need_ip, lacks_ipp) char *client; char *server; int need_ip; int *lacks_ipp; { FILE *f; int ret; char *filename; struct wordlist *addrs; filename = _PATH_SRPFILE; f = fopen(filename, "r"); if (f == NULL) return 0; if (client != NULL && client[0] == 0) client = NULL; else if (server != NULL && server[0] == 0) server = NULL; ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0); fclose(f); if (ret >= 0 && need_ip && !some_ip_ok(addrs)) { if (lacks_ipp != 0) *lacks_ipp = 1; ret = -1; } if (addrs != 0) free_wordlist(addrs); return ret >= 0; } #endif /* UNUSED */ #if PPP_AUTH_SUPPORT /* * get_secret - open the CHAP secret file and return the secret * for authenticating the given client on the given server. * (We could be either client or server). */ int get_secret(ppp_pcb *pcb, const char *client, const char *server, char *secret, int *secret_len, int am_server) { int len; LWIP_UNUSED_ARG(server); LWIP_UNUSED_ARG(am_server); if (!client || !client[0] || !pcb->settings.user || !pcb->settings.passwd || strcmp(client, pcb->settings.user)) { return 0; } len = (int)strlen(pcb->settings.passwd); if (len > MAXSECRETLEN) { ppp_error("Secret for %s on %s is too long", client, server); len = MAXSECRETLEN; } MEMCPY(secret, pcb->settings.passwd, len); *secret_len = len; return 1; #if 0 /* UNUSED */ FILE *f; int ret, len; char *filename; struct wordlist *addrs, *opts; char secbuf[MAXWORDLEN]; struct wordlist *addrs; addrs = NULL; if (!am_server && ppp_settings.passwd[0] != 0) { strlcpy(secbuf, ppp_settings.passwd, sizeof(secbuf)); } else if (!am_server && chap_passwd_hook) { if ( (*chap_passwd_hook)(client, secbuf) < 0) { ppp_error("Unable to obtain CHAP password for %s on %s from plugin", client, server); return 0; } } else { filename = _PATH_CHAPFILE; addrs = NULL; secbuf[0] = 0; f = fopen(filename, "r"); if (f == NULL) { ppp_error("Can't open chap secret file %s: %m", filename); return 0; } check_access(f, filename); ret = scan_authfile(f, client, server, secbuf, &addrs, &opts, filename, 0); fclose(f); if (ret < 0) return 0; if (am_server) set_allowed_addrs(unit, addrs, opts); else if (opts != 0) free_wordlist(opts); if (addrs != 0) free_wordlist(addrs); } len = strlen(secbuf); if (len > MAXSECRETLEN) { ppp_error("Secret for %s on %s is too long", client, server); len = MAXSECRETLEN; } MEMCPY(secret, secbuf, len); BZERO(secbuf, sizeof(secbuf)); *secret_len = len; return 1; #endif /* UNUSED */ } #endif /* PPP_AUTH_SUPPORT */ #if 0 /* UNUSED */ /* * get_srp_secret - open the SRP secret file and return the secret * for authenticating the given client on the given server. * (We could be either client or server). */ int get_srp_secret(unit, client, server, secret, am_server) int unit; char *client; char *server; char *secret; int am_server; { FILE *fp; int ret; char *filename; struct wordlist *addrs, *opts; if (!am_server && ppp_settings.passwd[0] != '\0') { strlcpy(secret, ppp_settings.passwd, MAXWORDLEN); } else { filename = _PATH_SRPFILE; addrs = NULL; fp = fopen(filename, "r"); if (fp == NULL) { ppp_error("Can't open srp secret file %s: %m", filename); return 0; } check_access(fp, filename); secret[0] = '\0'; ret = scan_authfile(fp, client, server, secret, &addrs, &opts, filename, am_server); fclose(fp); if (ret < 0) return 0; if (am_server) set_allowed_addrs(unit, addrs, opts); else if (opts != NULL) free_wordlist(opts); if (addrs != NULL) free_wordlist(addrs); } return 1; } /* * set_allowed_addrs() - set the list of allowed addresses. * Also looks for `--' indicating options to apply for this peer * and leaves the following words in extra_options. */ static void set_allowed_addrs(unit, addrs, opts) int unit; struct wordlist *addrs; struct wordlist *opts; { int n; struct wordlist *ap, **plink; struct permitted_ip *ip; char *ptr_word, *ptr_mask; struct hostent *hp; struct netent *np; u32_t a, mask, ah, offset; struct ipcp_options *wo = &ipcp_wantoptions[unit]; u32_t suggested_ip = 0; if (addresses[unit] != NULL) free(addresses[unit]); addresses[unit] = NULL; if (extra_options != NULL) free_wordlist(extra_options); extra_options = opts; /* * Count the number of IP addresses given. */ n = wordlist_count(addrs) + wordlist_count(noauth_addrs); if (n == 0) return; ip = (struct permitted_ip *) malloc((n + 1) * sizeof(struct permitted_ip)); if (ip == 0) return; /* temporarily append the noauth_addrs list to addrs */ for (plink = &addrs; *plink != NULL; plink = &(*plink)->next) ; *plink = noauth_addrs; n = 0; for (ap = addrs; ap != NULL; ap = ap->next) { /* "-" means no addresses authorized, "*" means any address allowed */ ptr_word = ap->word; if (strcmp(ptr_word, "-") == 0) break; if (strcmp(ptr_word, "*") == 0) { ip[n].permit = 1; ip[n].base = ip[n].mask = 0; ++n; break; } ip[n].permit = 1; if (*ptr_word == '!') { ip[n].permit = 0; ++ptr_word; } mask = ~ (u32_t) 0; offset = 0; ptr_mask = strchr (ptr_word, '/'); if (ptr_mask != NULL) { int bit_count; char *endp; bit_count = (int) strtol (ptr_mask+1, &endp, 10); if (bit_count <= 0 || bit_count > 32) { ppp_warn("invalid address length %v in auth. address list", ptr_mask+1); continue; } bit_count = 32 - bit_count; /* # bits in host part */ if (*endp == '+') { offset = ifunit + 1; ++endp; } if (*endp != 0) { ppp_warn("invalid address length syntax: %v", ptr_mask+1); continue; } *ptr_mask = '\0'; mask <<= bit_count; } hp = gethostbyname(ptr_word); if (hp != NULL && hp->h_addrtype == AF_INET) { a = *(u32_t *)hp->h_addr; } else { np = getnetbyname (ptr_word); if (np != NULL && np->n_addrtype == AF_INET) { a = lwip_htonl ((u32_t)np->n_net); if (ptr_mask == NULL) { /* calculate appropriate mask for net */ ah = lwip_ntohl(a); if (IN_CLASSA(ah)) mask = IN_CLASSA_NET; else if (IN_CLASSB(ah)) mask = IN_CLASSB_NET; else if (IN_CLASSC(ah)) mask = IN_CLASSC_NET; } } else { a = inet_addr (ptr_word); } } if (ptr_mask != NULL) *ptr_mask = '/'; if (a == (u32_t)-1L) { ppp_warn("unknown host %s in auth. address list", ap->word); continue; } if (offset != 0) { if (offset >= ~mask) { ppp_warn("interface unit %d too large for subnet %v", ifunit, ptr_word); continue; } a = lwip_htonl((lwip_ntohl(a) & mask) + offset); mask = ~(u32_t)0; } ip[n].mask = lwip_htonl(mask); ip[n].base = a & ip[n].mask; ++n; if (~mask == 0 && suggested_ip == 0) suggested_ip = a; } *plink = NULL; ip[n].permit = 0; /* make the last entry forbid all addresses */ ip[n].base = 0; /* to terminate the list */ ip[n].mask = 0; addresses[unit] = ip; /* * If the address given for the peer isn't authorized, or if * the user hasn't given one, AND there is an authorized address * which is a single host, then use that if we find one. */ if (suggested_ip != 0 && (wo->hisaddr == 0 || !auth_ip_addr(unit, wo->hisaddr))) { wo->hisaddr = suggested_ip; /* * Do we insist on this address? No, if there are other * addresses authorized than the suggested one. */ if (n > 1) wo->accept_remote = 1; } } /* * auth_ip_addr - check whether the peer is authorized to use * a given IP address. Returns 1 if authorized, 0 otherwise. */ int auth_ip_addr(unit, addr) int unit; u32_t addr; { int ok; /* don't allow loopback or multicast address */ if (bad_ip_adrs(addr)) return 0; if (allowed_address_hook) { ok = allowed_address_hook(addr); if (ok >= 0) return ok; } if (addresses[unit] != NULL) { ok = ip_addr_check(addr, addresses[unit]); if (ok >= 0) return ok; } if (auth_required) return 0; /* no addresses authorized */ return allow_any_ip || privileged || !have_route_to(addr); } static int ip_addr_check(addr, addrs) u32_t addr; struct permitted_ip *addrs; { for (; ; ++addrs) if ((addr & addrs->mask) == addrs->base) return addrs->permit; } /* * bad_ip_adrs - return 1 if the IP address is one we don't want * to use, such as an address in the loopback net or a multicast address. * addr is in network byte order. */ int bad_ip_adrs(addr) u32_t addr; { addr = lwip_ntohl(addr); return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || IN_MULTICAST(addr) || IN_BADCLASS(addr); } /* * some_ip_ok - check a wordlist to see if it authorizes any * IP address(es). */ static int some_ip_ok(addrs) struct wordlist *addrs; { for (; addrs != 0; addrs = addrs->next) { if (addrs->word[0] == '-') break; if (addrs->word[0] != '!') return 1; /* some IP address is allowed */ } return 0; } /* * auth_number - check whether the remote number is allowed to connect. * Returns 1 if authorized, 0 otherwise. */ int auth_number() { struct wordlist *wp = permitted_numbers; int l; /* Allow all if no authorization list. */ if (!wp) return 1; /* Allow if we have a match in the authorization list. */ while (wp) { /* trailing '*' wildcard */ l = strlen(wp->word); if ((wp->word)[l - 1] == '*') l--; if (!strncasecmp(wp->word, remote_number, l)) return 1; wp = wp->next; } return 0; } /* * check_access - complain if a secret file has too-liberal permissions. */ static void check_access(f, filename) FILE *f; char *filename; { struct stat sbuf; if (fstat(fileno(f), &sbuf) < 0) { ppp_warn("cannot stat secret file %s: %m", filename); } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) { ppp_warn("Warning - secret file %s has world and/or group access", filename); } } /* * scan_authfile - Scan an authorization file for a secret suitable * for authenticating `client' on `server'. The return value is -1 * if no secret is found, otherwise >= 0. The return value has * NONWILD_CLIENT set if the secret didn't have "*" for the client, and * NONWILD_SERVER set if the secret didn't have "*" for the server. * Any following words on the line up to a "--" (i.e. address authorization * info) are placed in a wordlist and returned in *addrs. Any * following words (extra options) are placed in a wordlist and * returned in *opts. * We assume secret is NULL or points to MAXWORDLEN bytes of space. * Flags are non-zero if we need two colons in the secret in order to * match. */ static int scan_authfile(f, client, server, secret, addrs, opts, filename, flags) FILE *f; char *client; char *server; char *secret; struct wordlist **addrs; struct wordlist **opts; char *filename; int flags; { int newline, xxx; int got_flag, best_flag; FILE *sf; struct wordlist *ap, *addr_list, *alist, **app; char word[MAXWORDLEN]; char atfile[MAXWORDLEN]; char lsecret[MAXWORDLEN]; char *cp; if (addrs != NULL) *addrs = NULL; if (opts != NULL) *opts = NULL; addr_list = NULL; if (!getword(f, word, &newline, filename)) return -1; /* file is empty??? */ newline = 1; best_flag = -1; for (;;) { /* * Skip until we find a word at the start of a line. */ while (!newline && getword(f, word, &newline, filename)) ; if (!newline) break; /* got to end of file */ /* * Got a client - check if it's a match or a wildcard. */ got_flag = 0; if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) { newline = 0; continue; } if (!ISWILD(word)) got_flag = NONWILD_CLIENT; /* * Now get a server and check if it matches. */ if (!getword(f, word, &newline, filename)) break; if (newline) continue; if (!ISWILD(word)) { if (server != NULL && strcmp(word, server) != 0) continue; got_flag |= NONWILD_SERVER; } /* * Got some sort of a match - see if it's better than what * we have already. */ if (got_flag <= best_flag) continue; /* * Get the secret. */ if (!getword(f, word, &newline, filename)) break; if (newline) continue; /* * SRP-SHA1 authenticator should never be reading secrets from * a file. (Authenticatee may, though.) */ if (flags && ((cp = strchr(word, ':')) == NULL || strchr(cp + 1, ':') == NULL)) continue; if (secret != NULL) { /* * Special syntax: @/pathname means read secret from file. */ if (word[0] == '@' && word[1] == '/') { strlcpy(atfile, word+1, sizeof(atfile)); if ((sf = fopen(atfile, "r")) == NULL) { ppp_warn("can't open indirect secret file %s", atfile); continue; } check_access(sf, atfile); if (!getword(sf, word, &xxx, atfile)) { ppp_warn("no secret in indirect secret file %s", atfile); fclose(sf); continue; } fclose(sf); } strlcpy(lsecret, word, sizeof(lsecret)); } /* * Now read address authorization info and make a wordlist. */ app = &alist; for (;;) { if (!getword(f, word, &newline, filename) || newline) break; ap = (struct wordlist *) malloc(sizeof(struct wordlist) + strlen(word) + 1); if (ap == NULL) novm("authorized addresses"); ap->word = (char *) (ap + 1); strcpy(ap->word, word); *app = ap; app = &ap->next; } *app = NULL; /* * This is the best so far; remember it. */ best_flag = got_flag; if (addr_list) free_wordlist(addr_list); addr_list = alist; if (secret != NULL) strlcpy(secret, lsecret, MAXWORDLEN); if (!newline) break; } /* scan for a -- word indicating the start of options */ for (app = &addr_list; (ap = *app) != NULL; app = &ap->next) if (strcmp(ap->word, "--") == 0) break; /* ap = start of options */ if (ap != NULL) { ap = ap->next; /* first option */ free(*app); /* free the "--" word */ *app = NULL; /* terminate addr list */ } if (opts != NULL) *opts = ap; else if (ap != NULL) free_wordlist(ap); if (addrs != NULL) *addrs = addr_list; else if (addr_list != NULL) free_wordlist(addr_list); return best_flag; } /* * wordlist_count - return the number of items in a wordlist */ static int wordlist_count(wp) struct wordlist *wp; { int n; for (n = 0; wp != NULL; wp = wp->next) ++n; return n; } /* * free_wordlist - release memory allocated for a wordlist. */ static void free_wordlist(wp) struct wordlist *wp; { struct wordlist *next; while (wp != NULL) { next = wp->next; free(wp); wp = next; } } #endif /* UNUSED */ #endif /* PPP_SUPPORT */