Added port of ppp-2.3.5 from Tomasz Domin <dot@comarch.pl> of ComArch SA.

Tomasz only tested this on the mpc823.

The official site for the original source for this PPP implementation is:

ftp://cs.anu.edu.au/pub/software/ppp

NOTE:  As of 11/30/1999, the current version of this source is 2.3.10.

1 files changed, 843 insertions, 0 deletions

diff --git a/c/src/libnetworking/pppd/auth.c b/c/src/libnetworking/pppd/auth.c
new file mode 100644
index 0000000000..f5cff9ac3d
--- /dev/null
+++ b/c/src/libnetworking/pppd/auth.c
@@ -0,0 +1,843 @@
+/*
+ * 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.
+ */
+
+#ifndef lint
+/* static char rcsid[] = "$Id$"; */
+#endif
+
+#include <stdio.h>
+#include <stddef.h>
+#include <stdlib.h> 
+#include <unistd.h>
+#include <syslog.h>
+#include <pwd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.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>
+/* #include <stbconfig.h> */
+
+#include "pppd.h"
+#include "fsm.h"
+#include "lcp.h"
+#include "ipcp.h"
+#include "upap.h"
+#include "chap.h"
+#ifdef CBCP_SUPPORT
+#include "cbcp.h"
+#endif
+#include "pathnames.h"
+
+/* Used for storing a sequence of words.  Usually malloced. */
+struct wordlist {
+    struct wordlist	*next;
+    char		word[1];
+};
+
+/* Bits in scan_authfile return value */
+#define NONWILD_SERVER	1
+#define NONWILD_CLIENT	2
+
+#define ISWILD(word)	(word[0] == '*' && word[1] == 0)
+
+#define FALSE	0
+#define TRUE	1
+
+/* The name by which the peer authenticated itself to us. */
+char peer_authname[MAXNAMELEN];
+
+/* 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;
+
+/* List of addresses which the peer may use. */
+static struct wordlist *addresses[NUM_PPP];
+
+/* 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;
+
+/* Set if we got the contents of passwd[] from the pap-secrets file. */
+static int passwd_from_file;
+
+/* Bits in auth_pending[] */
+#define PAP_WITHPEER	1
+#define PAP_PEER	2
+#define CHAP_WITHPEER	4
+#define CHAP_PEER	8
+
+extern char *crypt __P((const char *, const char *));
+
+/* Prototypes for procedures local to this file. */
+
+static void network_phase __P((int));
+static void check_idle __P((void *));
+static void connect_time_expired __P((void *));
+static int  plogin __P((char *, char *, char **, int *));
+static void plogout __P((void));
+static int  null_login __P((int));
+static int  get_pap_passwd __P((char *));
+static int  have_pap_secret __P((void));
+static int  have_chap_secret __P((char *, char *, u_int32_t));
+static int  ip_addr_check __P((u_int32_t, struct wordlist *));
+static int  scan_authfile __P((FILE *, char *, char *, u_int32_t, char *,
+			       struct wordlist **, char *));
+static void free_wordlist __P((struct wordlist *));
+static void auth_script __P((char *));
+static void set_allowed_addrs __P((int, struct wordlist *));
+
+/*
+ * 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(unit)
+    int unit;
+{
+}
+
+/*
+ * LCP has terminated the link; go to the Dead phase and take the
+ * physical layer down.
+ */
+void
+link_terminated(unit)
+    int unit;
+{
+    if (phase == PHASE_DEAD)
+	return;
+    if (logged_in)
+	plogout();
+    phase = PHASE_DEAD;
+    syslog(LOG_NOTICE, "Connection terminated.");
+}
+
+/*
+ * LCP has gone down; it will either die or try to re-establish.
+ */
+void
+link_down(unit)
+    int unit;
+{
+    int i;
+    struct protent *protp;
+
+	did_authup = 0;
+    for (i = 0; (protp = 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;
+    num_np_up = 0;
+    if (phase != PHASE_DEAD)
+	phase = PHASE_TERMINATE;
+}
+
+/*
+ * The link is established.
+ * Proceed to the Dead, Authenticate or Network phase as appropriate.
+ */
+void
+link_established(unit)
+    int unit;
+{
+    int auth;
+    lcp_options *wo = &lcp_wantoptions[unit];
+    lcp_options *go = &lcp_gotoptions[unit];
+    lcp_options *ho = &lcp_hisoptions[unit];
+    int i;
+    struct protent *protp;
+
+    /*
+     * Tell higher-level protocols that LCP is up.
+     */
+    for (i = 0; (protp = protocols[i]) != NULL; ++i)
+        if (protp->protocol != PPP_LCP && protp->enabled_flag
+	    && protp->lowerup != NULL)
+	    (*protp->lowerup)(unit);
+
+    if (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)) {
+	    lcp_close(unit, "peer refused to authenticate");
+	    return;
+	}
+    }
+
+    phase = PHASE_AUTHENTICATE;
+    auth = 0;
+    if (go->neg_chap) {
+	ChapAuthPeer(unit, our_name, go->chap_mdtype);
+	auth |= CHAP_PEER;
+    } else if (go->neg_upap) {
+	upap_authpeer(unit);
+	auth |= PAP_PEER;
+    }
+    if (ho->neg_chap) {
+	ChapAuthWithPeer(unit, user, ho->chap_mdtype);
+	auth |= CHAP_WITHPEER;
+    } else if (ho->neg_upap) {
+	if (passwd[0] == 0) {
+	    passwd_from_file = 1;
+	    get_pap_passwd(passwd);
+	}
+	upap_authwithpeer(unit, user, passwd);
+	auth |= PAP_WITHPEER;
+    }
+    auth_pending[unit] = auth;
+
+    if (!auth)
+	network_phase(unit);
+}
+
+/*
+ * Proceed to the network phase.
+ */
+static void
+network_phase(unit)
+    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) {
+	auth_script(_PATH_AUTHUP);
+	did_authup = 1;
+    }
+
+#ifdef CBCP_SUPPORT
+    /*
+     * If we negotiated callback, do it now.
+     */
+    if (go->neg_cbcp) {
+	phase = PHASE_CALLBACK;
+	(*cbcp_protent.open)(unit);
+	return;
+    }
+#endif
+
+    phase = PHASE_NETWORK;
+
+    for (i = 0; (protp = 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");
+}
+
+/*
+ * The peer has failed to authenticate himself using `protocol'.
+ */
+void
+auth_peer_fail(unit, protocol)
+    int unit, protocol;
+{
+    /*
+     * Authentication failure: take the link down
+     */
+    lcp_close(unit, "Authentication failed");
+}
+
+/*
+ * The peer has been successfully authenticated using `protocol'.
+ */
+void
+auth_peer_success(unit, protocol, name, namelen)
+    int unit, protocol;
+    char *name;
+    int namelen;
+{
+    int bit;
+
+    switch (protocol) {
+    case PPP_CHAP:
+	bit = CHAP_PEER;
+	break;
+    case PPP_PAP:
+	bit = PAP_PEER;
+	break;
+    default:
+	syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
+	       protocol);
+	return;
+    }
+
+    /*
+     * Save the authenticated name of the peer for later.
+     */
+    if (namelen > 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] &= ~bit) == 0)
+        network_phase(unit);
+}
+
+/*
+ * We have failed to authenticate ourselves to the peer using `protocol'.
+ */
+void
+auth_withpeer_fail(unit, protocol)
+    int unit, protocol;
+{
+    if (passwd_from_file)
+	BZERO(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.
+     */
+}
+
+/*
+ * We have successfully authenticated ourselves with the peer using `protocol'.
+ */
+void
+auth_withpeer_success(unit, protocol)
+    int unit, protocol;
+{
+    int bit;
+
+    switch (protocol) {
+    case PPP_CHAP:
+	bit = CHAP_WITHPEER;
+	break;
+    case PPP_PAP:
+	if (passwd_from_file)
+	    BZERO(passwd, MAXSECRETLEN);
+	bit = PAP_WITHPEER;
+	break;
+    default:
+
+	bit = 0;
+    }
+
+    /*
+     * If there is no more authentication still being done,
+     * proceed to the network (or callback) phase.
+     */
+    if ((auth_pending[unit] &= ~bit) == 0)
+	network_phase(unit);
+}
+
+
+/*
+ * np_up - a network protocol has come up.
+ */
+void
+np_up(unit, proto)
+    int unit, proto;
+{
+    if (num_np_up == 0) {
+	/*
+	 * At this point we consider that the link has come up successfully.
+	 */
+	need_holdoff = 0;
+
+	if (idle_time_limit > 0)
+	    TIMEOUT(check_idle, NULL, idle_time_limit);
+
+	/*
+	 * Set a timeout to close the connection once the maximum
+	 * connect time has expired.
+	 */
+	if (maxconnect > 0)
+	    TIMEOUT(connect_time_expired, 0, maxconnect);
+
+	/*
+	 * Detach now, if the updetach option was given.
+	 */
+	if (nodetach == -1)
+	    detach();
+    }
+    ++num_np_up;
+}
+
+/*
+ * np_down - a network protocol has gone down.
+ */
+void
+np_down(unit, proto)
+    int unit, proto;
+{
+    if (--num_np_up == 0 && idle_time_limit > 0) {
+	UNTIMEOUT(check_idle, NULL);
+    }
+}
+
+/*
+ * np_finished - a network protocol has finished using the link.
+ */
+void
+np_finished(unit, proto)
+    int 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(arg)
+     void *arg;
+{
+    struct ppp_idle idle;
+    time_t itime;
+
+    if (!get_idle_time(0, &idle))
+	return;
+    itime = MIN(idle.xmit_idle, idle.recv_idle);
+    if (itime >= idle_time_limit) {
+	/* link is idle: shut it down. */
+	syslog(LOG_INFO, "Terminating connection due to lack of activity.");
+	lcp_close(0, "Link inactive");
+    } else {
+	TIMEOUT(check_idle, NULL, idle_time_limit - itime);
+    }
+}
+
+/*
+ * connect_time_expired - log a message and close the connection.
+ */
+static void
+connect_time_expired(arg)
+    void *arg;
+{
+    syslog(LOG_INFO, "Connect time expired");
+    lcp_close(0, "Connect time expired");	/* Close connection */
+}
+
+/*
+ * auth_check_options - called to check authentication options.
+ */
+void
+auth_check_options()
+{
+    lcp_options *wo = &lcp_wantoptions[0];
+    int can_auth;
+    ipcp_options *ipwo = &ipcp_wantoptions[0];
+    u_int32_t remote;
+
+    /* Default our_name to hostname, and user to our_name */
+    if (our_name[0] == 0 || usehostname)
+	strcpy(our_name, hostname);
+    if (user[0] == 0)
+	strcpy(user, our_name);
+
+    /* If authentication is required, ask peer for CHAP or PAP. */
+    if (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 && (uselogin || have_pap_secret());
+    if (!can_auth && wo->neg_chap) {
+	remote = ipwo->accept_remote? 0: ipwo->hisaddr;
+	can_auth = have_chap_secret(remote_name, our_name, remote);
+    }
+
+    if (auth_required && !can_auth) {
+	option_error("peer authentication required but no suitable secret(s) found\n");
+	if (remote_name[0] == 0)
+	    option_error("for authenticating any peer to us (%s)\n", our_name);
+	else
+	    option_error("for authenticating peer %s to us (%s)\n",
+			 remote_name, our_name);
+	exit(1);
+    }
+
+    /*
+     * Check whether the user tried to override certain values
+     * set by root.
+     */
+    if (!auth_required && auth_req_info.priv > 0) {
+	if (!default_device && devnam_info.priv == 0) {
+	    option_error("can't override device name when noauth option used");
+	    exit(1);
+	}
+	if ((connector != NULL && connector_info.priv == 0)
+	    || (disconnector != NULL && disconnector_info.priv == 0)
+	    || (welcomer != NULL && welcomer_info.priv == 0)) {
+	    option_error("can't override connect, disconnect or welcome");
+	    option_error("option values when noauth option used");
+	    exit(1);
+	}
+    }
+}
+
+/*
+ * 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[0];
+    ipcp_options *ipwo = &ipcp_wantoptions[0];
+    u_int32_t remote;
+
+    ao->neg_upap = !refuse_pap /*&& (passwd[0] != 0 || get_pap_passwd(NULL))*/;
+    ao->neg_chap = !refuse_chap
+	&& have_chap_secret(user, remote_name, (u_int32_t)0);
+
+    if (go->neg_upap && !uselogin && !have_pap_secret())
+	go->neg_upap = 0;
+    if (go->neg_chap) {
+	remote = ipwo->accept_remote? 0: ipwo->hisaddr;
+	if (!have_chap_secret(remote_name, our_name, remote))
+	    go->neg_chap = 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, msglen)
+    int unit;
+    char *auser;
+    int userlen;
+    char *apasswd;
+    int passwdlen;
+    char **msg;
+    int *msglen;
+{
+
+
+    return UPAP_AUTHNAK;
+}
+
+
+/*
+ * 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(user, passwd, msg, msglen)
+    char *user;
+    char *passwd;
+    char **msg;
+    int *msglen;
+{
+    syslog(LOG_INFO, "user %s logged in", user);
+    logged_in = TRUE;
+
+    return (UPAP_AUTHACK);
+}
+
+/*
+ * plogout - Logout the user.
+ */
+static void
+plogout()
+{
+
+    logged_in = FALSE;
+}
+
+
+/*
+ * 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;
+{
+    return 1;
+}
+
+
+/*
+ * 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(passwd)
+    char *passwd;
+{
+#if 0
+/* XXX PPPConfiguration */
+	GlobalSystemStatus *stat;
+	stat=LockSTBSystemParam();
+	strncpy(passwd,  stat->PPP_Password, MAXSECRETLEN);
+	UnlockSTBSystemParam();
+#endif
+    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()
+{
+    return 1;
+}
+
+
+/*
+ * 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, remote)
+    char *client;
+    char *server;
+    u_int32_t remote;
+{
+
+    return 1;
+}
+
+
+/*
+ * 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(unit, client, server, secret, secret_len, save_addrs)
+    int unit;
+    char *client;
+    char *server;
+    char *secret;
+    int *secret_len;
+    int save_addrs;
+{
+#if 0
+/* XXX PPPConfiguration */
+    int len;
+	GlobalSystemStatus *stat;
+	stat=LockSTBSystemParam();
+    len=strlen(stat->PPP_Password);
+    strcpy( secret,stat->PPP_Password);
+	UnlockSTBSystemParam();
+
+    *secret_len = len;
+#endif
+    return 1;
+}
+
+/*
+ * set_allowed_addrs() - set the list of allowed addresses.
+ */
+static void
+set_allowed_addrs(unit, addrs)
+    int unit;
+    struct wordlist *addrs;
+{
+
+}
+
+/*
+ * 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;
+    u_int32_t addr;
+{
+    return ip_addr_check(addr, addresses[unit]);
+}
+
+static int
+ip_addr_check(addr, addrs)
+    u_int32_t addr;
+    struct wordlist *addrs;
+{
+#if 0
+    u_int32_t a, mask, ah;
+    int accept;
+    char *ptr_word, *ptr_mask;
+    struct hostent *hp;
+    struct netent *np;
+#endif
+
+    /* don't allow loopback or multicast address */
+    if (bad_ip_adrs(addr))
+	return 0;
+
+    if (addrs == NULL)
+	return !auth_required;		/* no addresses authorized */
+
+	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(addr)
+    u_int32_t addr;
+{
+    addr = ntohl(addr);
+    return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
+	|| IN_MULTICAST(addr) || IN_BADCLASS(addr);
+}
+
+/*
+ * check_access - complain if a secret file has too-liberal permissions.
+ */
+void
+check_access(f, filename)
+    FILE *f;
+    char *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 (i.e. address authorization
+ * info) are placed in a wordlist and returned in *addrs.  
+ */
+static int
+scan_authfile(f, client, server, ipaddr, secret, addrs, filename)
+    FILE *f;
+    char *client;
+    char *server;
+    u_int32_t ipaddr;
+    char *secret;
+    struct wordlist **addrs;
+    char *filename;
+{
+
+    return -1;
+}
+
+/*
+ * 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;
+    }
+}
+
+/*
+ * auth_script - execute a script with arguments
+ * interface-name peer-name real-user tty speed
+ */
+static void
+auth_script(script)
+    char *script;
+{
+}