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Posted to commits@mynewt.apache.org by ma...@apache.org on 2016/09/30 00:30:51 UTC
[08/51] [abbrv] [partial] incubator-mynewt-core git commit:
net/ip/lwip_base; LwIP.
http://git-wip-us.apache.org/repos/asf/incubator-mynewt-core/blob/f5a0f2a0/net/ip/lwip_base/src/netif/ppp/auth.c
----------------------------------------------------------------------
diff --git a/net/ip/lwip_base/src/netif/ppp/auth.c b/net/ip/lwip_base/src/netif/ppp/auth.c
new file mode 100644
index 0000000..109c146
--- /dev/null
+++ b/net/ip/lwip_base/src/netif/ppp/auth.c
@@ -0,0 +1,2510 @@
+/*
+ * 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
+ * <pa...@samba.org>".
+ *
+ * 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 <stdio.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <pwd.h>
+#include <grp.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <utmp.h>
+#include <fcntl.h>
+#if defined(_PATH_LASTLOG) && defined(__linux__)
+#include <lastlog.h>
+#endif
+
+#include <netdb.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#ifdef HAS_SHADOW
+#include <shadow.h>
+#ifndef PW_PPP
+#define PW_PPP PW_LOGIN
+#endif
+#endif
+
+#include <time.h>
+#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 = htonl ((u32_t)np->n_net);
+ if (ptr_mask == NULL) {
+ /* calculate appropriate mask for net */
+ ah = 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 = htonl((ntohl(a) & mask) + offset);
+ mask = ~(u32_t)0;
+ }
+ ip[n].mask = 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 = 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 */