diff options
Diffstat (limited to 'ext/lwip/src/netif/ppp/auth.c')
| -rw-r--r-- | ext/lwip/src/netif/ppp/auth.c | 1334 |
1 files changed, 0 insertions, 1334 deletions
diff --git a/ext/lwip/src/netif/ppp/auth.c b/ext/lwip/src/netif/ppp/auth.c deleted file mode 100644 index 0fd87a37..00000000 --- a/ext/lwip/src/netif/ppp/auth.c +++ /dev/null @@ -1,1334 +0,0 @@ -/***************************************************************************** -* auth.c - Network Authentication and Phase Control program file. -* -* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc. -* Copyright (c) 1997 by Global Election Systems Inc. All rights reserved. -* -* The authors hereby grant permission to use, copy, modify, distribute, -* and license this software and its documentation for any purpose, provided -* that existing copyright notices are retained in all copies and that this -* notice and the following disclaimer are included verbatim in any -* distributions. No written agreement, license, or royalty fee is required -* for any of the authorized uses. -* -* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR -* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES -* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. -* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, -* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT -* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF -* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -* -****************************************************************************** -* REVISION HISTORY -* -* 03-01-01 Marc Boucher <marc@mbsi.ca> -* Ported to lwIP. -* 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc. -* Ported from public pppd code. -*****************************************************************************/ -/* - * auth.c - PPP authentication and phase control. - * - * Copyright (c) 1993 The Australian National University. - * All rights reserved. - * - * Redistribution and use in source and binary forms are permitted - * provided that the above copyright notice and this paragraph are - * duplicated in all such forms and that any documentation, - * advertising materials, and other materials related to such - * distribution and use acknowledge that the software was developed - * by the Australian National University. The name of the University - * may not be used to endorse or promote products derived from this - * software without specific prior written permission. - * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED - * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. - * - * Copyright (c) 1989 Carnegie Mellon University. - * All rights reserved. - * - * Redistribution and use in source and binary forms are permitted - * provided that the above copyright notice and this paragraph are - * duplicated in all such forms and that any documentation, - * advertising materials, and other materials related to such - * distribution and use acknowledge that the software was developed - * by Carnegie Mellon University. The name of the - * University may not be used to endorse or promote products derived - * from this software without specific prior written permission. - * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED - * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. - */ - -#include "lwip/opt.h" - -#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */ - -#include "ppp_impl.h" -#include "pppdebug.h" - -#include "fsm.h" -#include "lcp.h" -#include "pap.h" -#include "chap.h" -#include "auth.h" -#include "ipcp.h" - -#if CBCP_SUPPORT -#include "cbcp.h" -#endif /* CBCP_SUPPORT */ - -#include "lwip/inet.h" - -#include <string.h> - -#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 PAP_SUPPORT || CHAP_SUPPORT -/* The name by which the peer authenticated itself to us. */ -static char peer_authname[MAXNAMELEN]; -#endif /* PAP_SUPPORT || CHAP_SUPPORT */ - -/* Records which authentication operations haven't completed yet. */ -static int auth_pending[NUM_PPP]; - -/* Set if we have successfully called plogin() */ -static int logged_in; - -/* Set if we have run the /etc/ppp/auth-up script. */ -static int did_authup; /* @todo, we don't need this in lwip*/ - -/* List of addresses which the peer may use. */ -static struct wordlist *addresses[NUM_PPP]; - -#if 0 /* UNUSED */ -/* Wordlist giving addresses which the peer may use - without authenticating itself. */ -static struct wordlist *noauth_addrs; - -/* Extra options to apply, from the secrets file entry for the peer. */ -static struct wordlist *extra_options; -#endif /* UNUSED */ - -/* Number of network protocols which we have opened. */ -static int num_np_open; - -/* Number of network protocols which have come up. */ -static int num_np_up; - -#if PAP_SUPPORT || CHAP_SUPPORT -/* Set if we got the contents of passwd[] from the pap-secrets file. */ -static int passwd_from_file; -#endif /* PAP_SUPPORT || CHAP_SUPPORT */ - -#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) __P((struct ppp_idle *)) = NULL; - -/* Hook for a plugin to say whether we can possibly authenticate any peer */ -int (*pap_check_hook) __P((void)) = NULL; - -/* Hook for a plugin to check the PAP user and password */ -int (*pap_auth_hook) __P((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) __P((void)) = NULL; - -/* Hook for a plugin to get the PAP password for authenticating us */ -int (*pap_passwd_hook) __P((char *user, char *passwd)) = NULL; - -/* - * This is used to ensure that we don't start an auth-up/down - * script while one is already running. - */ -enum script_state { - s_down, - s_up -}; - -static enum script_state auth_state = s_down; -static enum script_state auth_script_state = s_down; -static pid_t auth_script_pid = 0; - -/* - * Option variables. - * lwip: some of these are present in the ppp_settings structure - */ -bool uselogin = 0; /* Use /etc/passwd for checking PAP */ -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 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 */ -char remote_name[MAXNAMELEN]; /* Peer's name for authentication */ - -#endif /* UNUSED */ - -/* Bits in auth_pending[] */ -#define PAP_WITHPEER 1 -#define PAP_PEER 2 -#define CHAP_WITHPEER 4 -#define CHAP_PEER 8 - -/* @todo, move this somewhere */ -/* Used for storing a sequence of words. Usually malloced. */ -struct wordlist { - struct wordlist *next; - char word[1]; -}; - - -extern char *crypt (const char *, const char *); - -/* Prototypes for procedures local to this file. */ - -static void network_phase (int); -static void check_idle (void *); -static void connect_time_expired (void *); -#if 0 -static int plogin (char *, char *, char **, int *); -#endif -static void plogout (void); -static int null_login (int); -static int get_pap_passwd (int, char *, char *); -static int have_pap_secret (void); -static int have_chap_secret (char *, char *, u32_t); -static int ip_addr_check (u32_t, struct wordlist *); - -#if 0 /* PAP_SUPPORT || CHAP_SUPPORT */ -static int scan_authfile (FILE *, char *, char *, char *, - struct wordlist **, struct wordlist **, - char *); -static void free_wordlist (struct wordlist *); -static void auth_script (char *); -static void auth_script_done (void *); -static void set_allowed_addrs (int unit, struct wordlist *addrs); -static int some_ip_ok (struct wordlist *); -static int setupapfile (char **); -static int privgroup (char **); -static int set_noauth_addr (char **); -static void check_access (FILE *, char *); -#endif /* 0 */ /* PAP_SUPPORT || CHAP_SUPPORT */ - -#if 0 /* UNUSED */ -/* - * Authentication-related options. - */ -option_t auth_options[] = { - { "require-pap", o_bool, &lcp_wantoptions[0].neg_upap, - "Require PAP authentication from peer", 1, &auth_required }, - { "+pap", o_bool, &lcp_wantoptions[0].neg_upap, - "Require PAP authentication from peer", 1, &auth_required }, - { "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", 1 }, - { "require-chap", o_bool, &lcp_wantoptions[0].neg_chap, - "Require CHAP authentication from peer", 1, &auth_required }, - { "+chap", o_bool, &lcp_wantoptions[0].neg_chap, - "Require CHAP authentication from peer", 1, &auth_required }, - { "refuse-chap", o_bool, &refuse_chap, - "Don't agree to auth to peer with CHAP", 1 }, - { "-chap", o_bool, &refuse_chap, - "Don't allow CHAP authentication with peer", 1 }, - { "name", o_string, our_name, - "Set local name for authentication", - OPT_PRIV|OPT_STATIC, NULL, MAXNAMELEN }, - { "user", o_string, user, - "Set name for auth with peer", OPT_STATIC, NULL, MAXNAMELEN }, - { "usehostname", o_bool, &usehostname, - "Must use hostname for authentication", 1 }, - { "remotename", o_string, remote_name, - "Set remote name for authentication", OPT_STATIC, - &explicit_remote, MAXNAMELEN }, - { "auth", o_bool, &auth_required, - "Require authentication from peer", 1 }, - { "noauth", o_bool, &auth_required, - "Don't require peer to authenticate", OPT_PRIV, &allow_any_ip }, - { "login", o_bool, &uselogin, - "Use system password database for PAP", 1 }, - { "papcrypt", o_bool, &cryptpap, - "PAP passwords are encrypted", 1 }, - { "+ua", o_special, (void *)setupapfile, - "Get PAP user and password from file" }, - { "password", o_string, passwd, - "Password for authenticating us to the peer", OPT_STATIC, - NULL, MAXSECRETLEN }, - { "privgroup", o_special, (void *)privgroup, - "Allow group members to use privileged options", OPT_PRIV }, - { "allow-ip", o_special, (void *)set_noauth_addr, - "Set IP address(es) which can be used without authentication", - OPT_PRIV }, - { NULL } -}; -#endif /* UNUSED */ -#if 0 /* UNUSED */ -/* - * setupapfile - specifies UPAP info for authenticating with peer. - */ -static int -setupapfile(char **argv) -{ - FILE * ufile; - int l; - - lcp_allowoptions[0].neg_upap = 1; - - /* open user info file */ - seteuid(getuid()); - ufile = fopen(*argv, "r"); - seteuid(0); - if (ufile == NULL) { - option_error("unable to open user login data file %s", *argv); - return 0; - } - check_access(ufile, *argv); - - /* get username */ - if (fgets(user, MAXNAMELEN - 1, ufile) == NULL - || fgets(passwd, MAXSECRETLEN - 1, ufile) == NULL){ - option_error("unable to read user login data file %s", *argv); - return 0; - } - fclose(ufile); - - /* get rid of newlines */ - l = strlen(user); - if (l > 0 && user[l-1] == '\n') - user[l-1] = 0; - l = strlen(passwd); - if (l > 0 && passwd[l-1] == '\n') - passwd[l-1] = 0; - - return (1); -} -#endif /* UNUSED */ - -#if 0 /* UNUSED */ -/* - * privgroup - allow members of the group to have privileged access. - */ -static int -privgroup(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; -} -#endif - -#if 0 /* UNUSED */ -/* - * 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(char **argv) -{ - char *addr = *argv; - int l = strlen(addr); - struct wordlist *wp; - - wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l + 1); - if (wp == NULL) - novm("allow-ip argument"); - wp->word = (char *) (wp + 1); - wp->next = noauth_addrs; - BCOPY(addr, wp->word, l); - noauth_addrs = wp; - return 1; -} -#endif /* UNUSED */ - -/* - * An Open on LCP has requested a change from Dead to Establish phase. - * Do what's necessary to bring the physical layer up. - */ -void -link_required(int unit) -{ - LWIP_UNUSED_ARG(unit); - - AUTHDEBUG(LOG_INFO, ("link_required: %d\n", unit)); -} - -/* - * LCP has terminated the link; go to the Dead phase and take the - * physical layer down. - */ -void -link_terminated(int unit) -{ - AUTHDEBUG(LOG_INFO, ("link_terminated: %d\n", unit)); - if (lcp_phase[unit] == PHASE_DEAD) { - return; - } - if (logged_in) { - plogout(); - } - lcp_phase[unit] = PHASE_DEAD; - AUTHDEBUG(LOG_NOTICE, ("Connection terminated.\n")); - pppLinkTerminated(unit); -} - -/* - * LCP has gone down; it will either die or try to re-establish. - */ -void -link_down(int unit) -{ - int i; - struct protent *protp; - - AUTHDEBUG(LOG_INFO, ("link_down: %d\n", unit)); - - if (did_authup) { - /* XXX Do link down processing. */ - did_authup = 0; - } - for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) { - if (!protp->enabled_flag) { - continue; - } - if (protp->protocol != PPP_LCP && protp->lowerdown != NULL) { - (*protp->lowerdown)(unit); - } - if (protp->protocol < 0xC000 && protp->close != NULL) { - (*protp->close)(unit, "LCP down"); - } - } - num_np_open = 0; /* number of network protocols we have opened */ - num_np_up = 0; /* Number of network protocols which have come up */ - - if (lcp_phase[unit] != PHASE_DEAD) { - lcp_phase[unit] = PHASE_TERMINATE; - } - pppLinkDown(unit); -} - -/* - * The link is established. - * Proceed to the Dead, Authenticate or Network phase as appropriate. - */ -void -link_established(int unit) -{ - int auth; - int i; - struct protent *protp; - lcp_options *wo = &lcp_wantoptions[unit]; - lcp_options *go = &lcp_gotoptions[unit]; -#if PAP_SUPPORT || CHAP_SUPPORT - lcp_options *ho = &lcp_hisoptions[unit]; -#endif /* PAP_SUPPORT || CHAP_SUPPORT */ - - AUTHDEBUG(LOG_INFO, ("link_established: unit %d; Lowering up all protocols...\n", unit)); - /* - * Tell higher-level protocols that LCP is up. - */ - for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) { - if (protp->protocol != PPP_LCP && protp->enabled_flag && protp->lowerup != NULL) { - (*protp->lowerup)(unit); - } - } - if (ppp_settings.auth_required && !(go->neg_chap || go->neg_upap)) { - /* - * We wanted the peer to authenticate itself, and it refused: - * 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 (!wo->neg_upap || !null_login(unit)) { - AUTHDEBUG(LOG_WARNING, ("peer refused to authenticate\n")); - lcp_close(unit, "peer refused to authenticate"); - return; - } - } - - lcp_phase[unit] = PHASE_AUTHENTICATE; - auth = 0; -#if CHAP_SUPPORT - if (go->neg_chap) { - ChapAuthPeer(unit, ppp_settings.our_name, go->chap_mdtype); - auth |= CHAP_PEER; - } -#endif /* CHAP_SUPPORT */ -#if PAP_SUPPORT && CHAP_SUPPORT - else -#endif /* PAP_SUPPORT && CHAP_SUPPORT */ -#if PAP_SUPPORT - if (go->neg_upap) { - upap_authpeer(unit); - auth |= PAP_PEER; - } -#endif /* PAP_SUPPORT */ -#if CHAP_SUPPORT - if (ho->neg_chap) { - ChapAuthWithPeer(unit, ppp_settings.user, ho->chap_mdtype); - auth |= CHAP_WITHPEER; - } -#endif /* CHAP_SUPPORT */ -#if PAP_SUPPORT && CHAP_SUPPORT - else -#endif /* PAP_SUPPORT && CHAP_SUPPORT */ -#if PAP_SUPPORT - if (ho->neg_upap) { - if (ppp_settings.passwd[0] == 0) { - passwd_from_file = 1; - if (!get_pap_passwd(unit, ppp_settings.user, ppp_settings.passwd)) { - AUTHDEBUG(LOG_ERR, ("No secret found for PAP login\n")); - } - } - upap_authwithpeer(unit, ppp_settings.user, ppp_settings.passwd); - auth |= PAP_WITHPEER; - } -#endif /* PAP_SUPPORT */ - auth_pending[unit] = auth; - - if (!auth) { - network_phase(unit); - } -} - -/* - * Proceed to the network phase. - */ -static void -network_phase(int unit) -{ - int i; - struct protent *protp; - lcp_options *go = &lcp_gotoptions[unit]; - - /* - * If the peer had to authenticate, run the auth-up script now. - */ - if ((go->neg_chap || go->neg_upap) && !did_authup) { - /* XXX Do setup for peer authentication. */ - did_authup = 1; - } - -#if CBCP_SUPPORT - /* - * If we negotiated callback, do it now. - */ - if (go->neg_cbcp) { - lcp_phase[unit] = PHASE_CALLBACK; - (*cbcp_protent.open)(unit); - return; - } -#endif /* CBCP_SUPPORT */ - - lcp_phase[unit] = PHASE_NETWORK; - for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) { - if (protp->protocol < 0xC000 && protp->enabled_flag && protp->open != NULL) { - (*protp->open)(unit); - if (protp->protocol != PPP_CCP) { - ++num_np_open; - } - } - } - - if (num_np_open == 0) { - /* nothing to do */ - lcp_close(0, "No network protocols running"); - } -} -/* @todo: add void start_networks(void) here (pppd 2.3.11) */ - -/* - * The peer has failed to authenticate himself using `protocol'. - */ -void -auth_peer_fail(int unit, u16_t protocol) -{ - LWIP_UNUSED_ARG(protocol); - - AUTHDEBUG(LOG_INFO, ("auth_peer_fail: %d proto=%X\n", unit, protocol)); - /* - * Authentication failure: take the link down - */ - lcp_close(unit, "Authentication failed"); -} - - -#if PAP_SUPPORT || CHAP_SUPPORT -/* - * The peer has been successfully authenticated using `protocol'. - */ -void -auth_peer_success(int unit, u16_t protocol, char *name, int namelen) -{ - int pbit; - - AUTHDEBUG(LOG_INFO, ("auth_peer_success: %d proto=%X\n", unit, protocol)); - switch (protocol) { - case PPP_CHAP: - pbit = CHAP_PEER; - break; - case PPP_PAP: - pbit = PAP_PEER; - break; - default: - AUTHDEBUG(LOG_WARNING, ("auth_peer_success: unknown protocol %x\n", protocol)); - return; - } - - /* - * Save the authenticated name of the peer for later. - */ - if (namelen > (int)sizeof(peer_authname) - 1) { - namelen = sizeof(peer_authname) - 1; - } - BCOPY(name, peer_authname, namelen); - peer_authname[namelen] = 0; - - /* - * If there is no more authentication still to be done, - * proceed to the network (or callback) phase. - */ - if ((auth_pending[unit] &= ~pbit) == 0) { - network_phase(unit); - } -} - -/* - * We have failed to authenticate ourselves to the peer using `protocol'. - */ -void -auth_withpeer_fail(int unit, u16_t protocol) -{ - int errCode = PPPERR_AUTHFAIL; - - LWIP_UNUSED_ARG(protocol); - - AUTHDEBUG(LOG_INFO, ("auth_withpeer_fail: %d proto=%X\n", unit, protocol)); - if (passwd_from_file) { - BZERO(ppp_settings.passwd, MAXSECRETLEN); - } - - /* - * We've failed to authenticate ourselves to our peer. - * He'll probably take the link down, and there's not much - * we can do except wait for that. - */ - pppIOCtl(unit, PPPCTLS_ERRCODE, &errCode); - lcp_close(unit, "Failed to authenticate ourselves to peer"); -} - -/* - * We have successfully authenticated ourselves with the peer using `protocol'. - */ -void -auth_withpeer_success(int unit, u16_t protocol) -{ - int pbit; - - AUTHDEBUG(LOG_INFO, ("auth_withpeer_success: %d proto=%X\n", unit, protocol)); - switch (protocol) { - case PPP_CHAP: - pbit = CHAP_WITHPEER; - break; - case PPP_PAP: - if (passwd_from_file) { - BZERO(ppp_settings.passwd, MAXSECRETLEN); - } - pbit = PAP_WITHPEER; - break; - default: - AUTHDEBUG(LOG_WARNING, ("auth_peer_success: unknown protocol %x\n", protocol)); - pbit = 0; - } - - /* - * If there is no more authentication still being done, - * proceed to the network (or callback) phase. - */ - if ((auth_pending[unit] &= ~pbit) == 0) { - network_phase(unit); - } -} -#endif /* PAP_SUPPORT || CHAP_SUPPORT */ - - -/* - * np_up - a network protocol has come up. - */ -void -np_up(int unit, u16_t proto) -{ - LWIP_UNUSED_ARG(unit); - LWIP_UNUSED_ARG(proto); - - AUTHDEBUG(LOG_INFO, ("np_up: %d proto=%X\n", unit, proto)); - if (num_np_up == 0) { - AUTHDEBUG(LOG_INFO, ("np_up: maxconnect=%d idle_time_limit=%d\n",ppp_settings.maxconnect,ppp_settings.idle_time_limit)); - /* - * At this point we consider that the link has come up successfully. - */ - if (ppp_settings.idle_time_limit > 0) { - TIMEOUT(check_idle, NULL, ppp_settings.idle_time_limit); - } - - /* - * Set a timeout to close the connection once the maximum - * connect time has expired. - */ - if (ppp_settings.maxconnect > 0) { - TIMEOUT(connect_time_expired, 0, ppp_settings.maxconnect); - } - } - ++num_np_up; -} - -/* - * np_down - a network protocol has gone down. - */ -void -np_down(int unit, u16_t proto) -{ - LWIP_UNUSED_ARG(unit); - LWIP_UNUSED_ARG(proto); - - AUTHDEBUG(LOG_INFO, ("np_down: %d proto=%X\n", unit, proto)); - if (--num_np_up == 0 && ppp_settings.idle_time_limit > 0) { - UNTIMEOUT(check_idle, NULL); - } -} - -/* - * np_finished - a network protocol has finished using the link. - */ -void -np_finished(int unit, u16_t proto) -{ - LWIP_UNUSED_ARG(unit); - LWIP_UNUSED_ARG(proto); - - AUTHDEBUG(LOG_INFO, ("np_finished: %d proto=%X\n", unit, proto)); - if (--num_np_open <= 0) { - /* no further use for the link: shut up shop. */ - lcp_close(0, "No network protocols running"); - } -} - -/* - * check_idle - check whether the link has been idle for long - * enough that we can shut it down. - */ -static void -check_idle(void *arg) -{ - struct ppp_idle idle; - u_short itime; - - LWIP_UNUSED_ARG(arg); - if (!get_idle_time(0, &idle)) { - return; - } - itime = LWIP_MIN(idle.xmit_idle, idle.recv_idle); - if (itime >= ppp_settings.idle_time_limit) { - /* link is idle: shut it down. */ - AUTHDEBUG(LOG_INFO, ("Terminating connection due to lack of activity.\n")); - lcp_close(0, "Link inactive"); - } else { - TIMEOUT(check_idle, NULL, ppp_settings.idle_time_limit - itime); - } -} - -/* - * connect_time_expired - log a message and close the connection. - */ -static void -connect_time_expired(void *arg) -{ - LWIP_UNUSED_ARG(arg); - - AUTHDEBUG(LOG_INFO, ("Connect time expired\n")); - lcp_close(0, "Connect time expired"); /* Close connection */ -} - -#if 0 /* UNUSED */ -/* - * auth_check_options - called to check authentication options. - */ -void -auth_check_options(void) -{ - lcp_options *wo = &lcp_wantoptions[0]; - int can_auth; - ipcp_options *ipwo = &ipcp_wantoptions[0]; - u32_t remote; - - /* Default our_name to hostname, and user to our_name */ - if (ppp_settings.our_name[0] == 0 || ppp_settings.usehostname) { - strcpy(ppp_settings.our_name, ppp_settings.hostname); - } - - if (ppp_settings.user[0] == 0) { - strcpy(ppp_settings.user, ppp_settings.our_name); - } - - /* If authentication is required, ask peer for CHAP or PAP. */ - if (ppp_settings.auth_required && !wo->neg_chap && !wo->neg_upap) { - wo->neg_chap = 1; - wo->neg_upap = 1; - } - - /* - * Check whether we have appropriate secrets to use - * to authenticate the peer. - */ - can_auth = wo->neg_upap && have_pap_secret(); - if (!can_auth && wo->neg_chap) { - remote = ipwo->accept_remote? 0: ipwo->hisaddr; - can_auth = have_chap_secret(ppp_settings.remote_name, ppp_settings.our_name, remote); - } - - if (ppp_settings.auth_required && !can_auth) { - ppp_panic("No auth secret"); - } -} -#endif /* 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(int unit) -{ - lcp_options *go = &lcp_gotoptions[unit]; - lcp_options *ao = &lcp_allowoptions[0]; - ipcp_options *ipwo = &ipcp_wantoptions[0]; - u32_t remote; - - AUTHDEBUG(LOG_INFO, ("auth_reset: %d\n", unit)); - ao->neg_upap = !ppp_settings.refuse_pap && (ppp_settings.passwd[0] != 0 || get_pap_passwd(unit, NULL, NULL)); - ao->neg_chap = !ppp_settings.refuse_chap && ppp_settings.passwd[0] != 0 /*have_chap_secret(ppp_settings.user, ppp_settings.remote_name, (u32_t)0)*/; - - if (go->neg_upap && !have_pap_secret()) { - go->neg_upap = 0; - } - if (go->neg_chap) { - remote = ipwo->accept_remote? 0: ipwo->hisaddr; - if (!have_chap_secret(ppp_settings.remote_name, ppp_settings.our_name, remote)) { - go->neg_chap = 0; - } - } -} - -#if PAP_SUPPORT -/* - * 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. - */ -u_char -check_passwd( int unit, char *auser, int userlen, char *apasswd, int passwdlen, char **msg, int *msglen) -{ -#if 1 /* XXX Assume all entries OK. */ - LWIP_UNUSED_ARG(unit); - LWIP_UNUSED_ARG(auser); - LWIP_UNUSED_ARG(userlen); - LWIP_UNUSED_ARG(apasswd); - LWIP_UNUSED_ARG(passwdlen); - LWIP_UNUSED_ARG(msglen); - *msg = (char *) 0; - return UPAP_AUTHACK; /* XXX Assume all entries OK. */ -#else - u_char ret = 0; - struct wordlist *addrs = NULL; - char passwd[256], user[256]; - char secret[MAXWORDLEN]; - static u_short attempts = 0; - - /* - * Make copies of apasswd and auser, then null-terminate them. - */ - BCOPY(apasswd, passwd, passwdlen); - passwd[passwdlen] = '\0'; - BCOPY(auser, user, userlen); - user[userlen] = '\0'; - *msg = (char *) 0; - - /* XXX Validate user name and password. */ - ret = UPAP_AUTHACK; /* XXX Assume all entries OK. */ - - if (ret == UPAP_AUTHNAK) { - if (*msg == (char *) 0) { - *msg = "Login incorrect"; - } - *msglen = strlen(*msg); - /* - * 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) { - AUTHDEBUG(LOG_WARNING, ("%d LOGIN FAILURES BY %s\n", attempts, user)); - /*ppp_panic("Excess Bad Logins");*/ - } - if (attempts > 3) { - /* @todo: this was sleep(), i.e. seconds, not milliseconds - * I don't think we really need this in lwIP - we would block tcpip_thread! - */ - /*sys_msleep((attempts - 3) * 5);*/ - } - if (addrs != NULL) { - free_wordlist(addrs); - } - } else { - attempts = 0; /* Reset count */ - if (*msg == (char *) 0) { - *msg = "Login ok"; - } - *msglen = strlen(*msg); - set_allowed_addrs(unit, addrs); - } - - BZERO(passwd, sizeof(passwd)); - BZERO(secret, sizeof(secret)); - - return ret; -#endif -} -#endif /* PAP_SUPPORT */ - -#if 0 /* UNUSED */ -/* - * This function is needed for PAM. - */ - -#ifdef USE_PAM - -/* lwip does not support PAM*/ - -#endif /* USE_PAM */ - -#endif /* UNUSED */ - - -#if 0 /* UNUSED */ -/* - * plogin - Check the user name and password against the system - * password database, and login the user if OK. - * - * returns: - * UPAP_AUTHNAK: Login failed. - * UPAP_AUTHACK: Login succeeded. - * In either case, msg points to an appropriate message. - */ -static int -plogin(char *user, char *passwd, char **msg, int *msglen) -{ - - LWIP_UNUSED_ARG(user); - LWIP_UNUSED_ARG(passwd); - LWIP_UNUSED_ARG(msg); - LWIP_UNUSED_ARG(msglen); - - - /* The new lines are here align the file when - * compared against the pppd 2.3.11 code */ - - - - - - - - - - - - - - - - - /* XXX Fail until we decide that we want to support logins. */ - return (UPAP_AUTHNAK); -} -#endif - - - -/* - * plogout - Logout the user. - */ -static void -plogout(void) -{ - logged_in = 0; -} - -/* - * 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(int unit) -{ - LWIP_UNUSED_ARG(unit); - /* XXX Fail until we decide that we want to support logins. */ - return 0; -} - - -/* - * 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. - */ -static int -get_pap_passwd(int unit, char *user, char *passwd) -{ - LWIP_UNUSED_ARG(unit); -/* normally we would reject PAP if no password is provided, - but this causes problems with some providers (like CHT in Taiwan) - who incorrectly request PAP and expect a bogus/empty password, so - always provide a default user/passwd of "none"/"none" - - @todo: This should be configured by the user, instead of being hardcoded here! -*/ - if(user) { - strcpy(user, "none"); - } - if(passwd) { - strcpy(passwd, "none"); - } - 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(void) -{ - /* XXX Fail until we set up our passwords. */ - return 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(char *client, char *server, u32_t remote) -{ - LWIP_UNUSED_ARG(client); - LWIP_UNUSED_ARG(server); - LWIP_UNUSED_ARG(remote); - - /* XXX Fail until we set up our passwords. */ - return 0; -} -#if CHAP_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(int unit, char *client, char *server, char *secret, int *secret_len, int save_addrs) -{ -#if 1 - int len; - struct wordlist *addrs; - - LWIP_UNUSED_ARG(unit); - LWIP_UNUSED_ARG(server); - LWIP_UNUSED_ARG(save_addrs); - - addrs = NULL; - - if(!client || !client[0] || strcmp(client, ppp_settings.user)) { - return 0; - } - - len = (int)strlen(ppp_settings.passwd); - if (len > MAXSECRETLEN) { - AUTHDEBUG(LOG_ERR, ("Secret for %s on %s is too long\n", client, server)); - len = MAXSECRETLEN; - } - - BCOPY(ppp_settings.passwd, secret, len); - *secret_len = len; - - return 1; -#else - int ret = 0, len; - struct wordlist *addrs; - char secbuf[MAXWORDLEN]; - - addrs = NULL; - secbuf[0] = 0; - - /* XXX Find secret. */ - if (ret < 0) { - return 0; - } - - if (save_addrs) { - set_allowed_addrs(unit, addrs); - } - - len = strlen(secbuf); - if (len > MAXSECRETLEN) { - AUTHDEBUG(LOG_ERR, ("Secret for %s on %s is too long\n", client, server)); - len = MAXSECRETLEN; - } - - BCOPY(secbuf, secret, len); - BZERO(secbuf, sizeof(secbuf)); - *secret_len = len; - - return 1; -#endif -} -#endif /* CHAP_SUPPORT */ - - -#if 0 /* PAP_SUPPORT || CHAP_SUPPORT */ -/* - * set_allowed_addrs() - set the list of allowed addresses. - */ -static void -set_allowed_addrs(int unit, struct wordlist *addrs) -{ - if (addresses[unit] != NULL) { - free_wordlist(addresses[unit]); - } - addresses[unit] = addrs; - -#if 0 - /* - * If there's only one authorized address we might as well - * ask our peer for that one right away - */ - if (addrs != NULL && addrs->next == NULL) { - char *p = addrs->word; - struct ipcp_options *wo = &ipcp_wantoptions[unit]; - u32_t a; - struct hostent *hp; - - if (wo->hisaddr == 0 && *p != '!' && *p != '-' && strchr(p, '/') == NULL) { - hp = gethostbyname(p); - if (hp != NULL && hp->h_addrtype == AF_INET) { - a = *(u32_t *)hp->h_addr; - } else { - a = inet_addr(p); - } - if (a != (u32_t) -1) { - wo->hisaddr = a; - } - } - } -#endif -} -#endif /* 0 */ /* PAP_SUPPORT || CHAP_SUPPORT */ - -/* - * 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(int unit, u32_t addr) -{ - return ip_addr_check(addr, addresses[unit]); -} - -static int /* @todo: integrate this funtion into auth_ip_addr()*/ -ip_addr_check(u32_t addr, struct wordlist *addrs) -{ - /* don't allow loopback or multicast address */ - if (bad_ip_adrs(addr)) { - return 0; - } - - if (addrs == NULL) { - return !ppp_settings.auth_required; /* no addresses authorized */ - } - - /* XXX All other addresses allowed. */ - return 1; -} - -/* - * 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(u32_t addr) -{ - addr = ntohl(addr); - return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET - || IN_MULTICAST(addr) || IN_BADCLASS(addr); -} - -#if 0 /* UNUSED */ /* PAP_SUPPORT || CHAP_SUPPORT */ -/* - * some_ip_ok - check a wordlist to see if it authorizes any - * IP address(es). - */ -static int -some_ip_ok(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; -} - -/* - * check_access - complain if a secret file has too-liberal permissions. - */ -static void -check_access(FILE *f, char *filename) -{ - struct stat sbuf; - - if (fstat(fileno(f), &sbuf) < 0) { - warn("cannot stat secret file %s: %m", filename); - } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) { - 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. - */ -static int -scan_authfile(FILE *f, char *client, char *server, char *secret, struct wordlist **addrs, struct wordlist **opts, char *filename) -{ - /* We do not (currently) need this in lwip */ - return 0; /* dummy */ -} -/* - * free_wordlist - release memory allocated for a wordlist. - */ -static void -free_wordlist(struct wordlist *wp) -{ - struct wordlist *next; - - while (wp != NULL) { - next = wp->next; - free(wp); - wp = next; - } -} - -/* - * auth_script_done - called when the auth-up or auth-down script - * has finished. - */ -static void -auth_script_done(void *arg) -{ - auth_script_pid = 0; - switch (auth_script_state) { - case s_up: - if (auth_state == s_down) { - auth_script_state = s_down; - auth_script(_PATH_AUTHDOWN); - } - break; - case s_down: - if (auth_state == s_up) { - auth_script_state = s_up; - auth_script(_PATH_AUTHUP); - } - break; - } -} - -/* - * auth_script - execute a script with arguments - * interface-name peer-name real-user tty speed - */ -static void -auth_script(char *script) -{ - char strspeed[32]; - struct passwd *pw; - char struid[32]; - char *user_name; - char *argv[8]; - - if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL) - user_name = pw->pw_name; - else { - slprintf(struid, sizeof(struid), "%d", getuid()); - user_name = struid; - } - slprintf(strspeed, sizeof(strspeed), "%d", baud_rate); - - argv[0] = script; - argv[1] = ifname; - argv[2] = peer_authname; - argv[3] = user_name; - argv[4] = devnam; - argv[5] = strspeed; - argv[6] = NULL; - - auth_script_pid = run_program(script, argv, 0, auth_script_done, NULL); -} -#endif /* 0 */ /* PAP_SUPPORT || CHAP_SUPPORT */ -#endif /* PPP_SUPPORT */ |