1532 lines
35 KiB
C
1532 lines
35 KiB
C
/*
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* auth.c - PPP authentication and phase control.
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*
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* Copyright (c) 1993 The Australian National University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the Australian National University. The name of the University
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* may not be used to endorse or promote products derived from this
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* software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Copyright (c) 1989 Carnegie Mellon University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by Carnegie Mellon University. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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static char rcsid[] = "$Id: auth.c,v 1.19 1997/10/10 06:02:54 peter Exp $";
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#endif
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#include <stdio.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <pwd.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <sys/time.h>
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#include <utmp.h>
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#ifdef USE_PAM
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#include <security/pam_appl.h>
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#include <security/pam_modules.h>
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#endif
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#ifdef HAS_SHADOW
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#include <shadow.h>
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#ifndef SVR4
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#include <shadow/pwauth.h>
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#endif
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#ifndef PW_PPP
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#define PW_PPP PW_LOGIN
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#endif
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#endif
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#include "pppd.h"
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#include "fsm.h"
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#include "lcp.h"
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#include "ipcp.h"
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#include "upap.h"
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#include "chap.h"
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#ifdef CBCP_SUPPORT
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#include "cbcp.h"
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#endif
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#include "pathnames.h"
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/* Used for storing a sequence of words. Usually malloced. */
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struct wordlist {
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struct wordlist *next;
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char word[1];
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};
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/* Bits in scan_authfile return value */
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#define NONWILD_SERVER 1
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#define NONWILD_CLIENT 2
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#define ISWILD(word) (word[0] == '*' && word[1] == 0)
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#define FALSE 0
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#define TRUE 1
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/* The name by which the peer authenticated itself to us. */
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char peer_authname[MAXNAMELEN];
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/* Records which authentication operations haven't completed yet. */
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static int auth_pending[NUM_PPP];
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/* Set if we have successfully called login() */
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static int logged_in;
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/* Set if not wild or blank */
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static int non_wildclient;
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/* Set if we have run the /etc/ppp/auth-up script. */
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static int did_authup;
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/* List of addresses which the peer may use. */
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static struct wordlist *addresses[NUM_PPP];
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/* Number of network protocols which we have opened. */
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static int num_np_open;
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/* Number of network protocols which have come up. */
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static int num_np_up;
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/* Set if we got the contents of passwd[] from the pap-secrets file. */
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static int passwd_from_file;
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/* Bits in auth_pending[] */
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#define PAP_WITHPEER 1
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#define PAP_PEER 2
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#define CHAP_WITHPEER 4
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#define CHAP_PEER 8
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extern char *crypt __P((const char *, const char *));
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/* Prototypes for procedures local to this file. */
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static void network_phase __P((int));
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static void check_idle __P((void *));
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static void connect_time_expired __P((void *));
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static int ppplogin __P((char *, char *, char **, int *));
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static void ppplogout __P((void));
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static int null_login __P((int));
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static int get_pap_passwd __P((char *));
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static int have_pap_secret __P((void));
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static int have_chap_secret __P((char *, char *, u_int32_t));
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static int ip_addr_check __P((u_int32_t, struct wordlist *));
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static int scan_authfile __P((FILE *, char *, char *, u_int32_t, char *,
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struct wordlist **, char *));
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static void free_wordlist __P((struct wordlist *));
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static void auth_set_ip_addr __P((int));
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static void auth_script __P((char *));
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static void set_allowed_addrs __P((int, struct wordlist *));
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#ifdef CBCP_SUPPORT
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static void callback_phase __P((int));
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#endif
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/*
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* An Open on LCP has requested a change from Dead to Establish phase.
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* Do what's necessary to bring the physical layer up.
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*/
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void
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link_required(unit)
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int unit;
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{
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}
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/*
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* LCP has terminated the link; go to the Dead phase and take the
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* physical layer down.
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*/
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void
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link_terminated(unit)
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int unit;
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{
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extern time_t etime, stime;
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extern int minutes;
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if (phase == PHASE_DEAD)
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return;
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if (logged_in)
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ppplogout();
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phase = PHASE_DEAD;
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etime = time((time_t *) NULL);
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minutes = (etime-stime)/60;
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syslog(LOG_NOTICE, "Connection terminated, connected for %d minutes\n",
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minutes > 1 ? minutes : 1);
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}
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/*
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* LCP has gone down; it will either die or try to re-establish.
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*/
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void
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link_down(unit)
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int unit;
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{
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int i;
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struct protent *protp;
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if (did_authup) {
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auth_script(_PATH_AUTHDOWN);
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did_authup = 0;
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}
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for (i = 0; (protp = protocols[i]) != NULL; ++i) {
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if (!protp->enabled_flag)
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continue;
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if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
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(*protp->lowerdown)(unit);
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if (protp->protocol < 0xC000 && protp->close != NULL)
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(*protp->close)(unit, "LCP down");
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}
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num_np_open = 0;
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num_np_up = 0;
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if (phase != PHASE_DEAD)
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phase = PHASE_TERMINATE;
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}
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/*
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* The link is established.
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* Proceed to the Dead, Authenticate or Network phase as appropriate.
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*/
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void
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link_established(unit)
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int unit;
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{
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int auth;
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lcp_options *wo = &lcp_wantoptions[unit];
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lcp_options *go = &lcp_gotoptions[unit];
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lcp_options *ho = &lcp_hisoptions[unit];
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int i;
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struct protent *protp;
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/*
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* Tell higher-level protocols that LCP is up.
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*/
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for (i = 0; (protp = protocols[i]) != NULL; ++i)
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if (protp->protocol != PPP_LCP && protp->enabled_flag
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&& protp->lowerup != NULL)
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(*protp->lowerup)(unit);
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if (auth_required && !(go->neg_chap || go->neg_upap)) {
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/*
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* We wanted the peer to authenticate itself, and it refused:
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* treat it as though it authenticated with PAP using a username
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* of "" and a password of "". If that's not OK, boot it out.
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*/
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if (!wo->neg_upap || !null_login(unit)) {
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syslog(LOG_WARNING, "peer refused to authenticate");
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lcp_close(unit, "peer refused to authenticate");
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return;
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}
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}
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phase = PHASE_AUTHENTICATE;
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auth = 0;
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if (go->neg_chap) {
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ChapAuthPeer(unit, our_name, go->chap_mdtype);
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auth |= CHAP_PEER;
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} else if (go->neg_upap) {
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upap_authpeer(unit);
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auth |= PAP_PEER;
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}
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if (ho->neg_chap) {
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ChapAuthWithPeer(unit, user, ho->chap_mdtype);
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auth |= CHAP_WITHPEER;
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} else if (ho->neg_upap) {
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if (passwd[0] == 0) {
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passwd_from_file = 1;
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if (!get_pap_passwd(passwd))
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syslog(LOG_ERR, "No secret found for PAP login");
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}
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upap_authwithpeer(unit, user, passwd);
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auth |= PAP_WITHPEER;
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}
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auth_pending[unit] = auth;
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if (!auth)
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network_phase(unit);
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}
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/*
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* Proceed to the network phase.
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*/
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static void
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network_phase(unit)
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int unit;
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{
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int i;
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struct protent *protp;
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lcp_options *go = &lcp_gotoptions[unit];
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/*
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* If the peer had to authenticate, run the auth-up script now.
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*/
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if ((go->neg_chap || go->neg_upap) && !did_authup) {
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auth_script(_PATH_AUTHUP);
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did_authup = 1;
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}
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#ifdef CBCP_SUPPORT
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/*
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* If we negotiated callback, do it now.
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*/
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if (go->neg_cbcp) {
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phase = PHASE_CALLBACK;
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(*cbcp_protent.open)(unit);
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return;
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}
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#endif
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phase = PHASE_NETWORK;
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#if 0
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if (!demand)
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set_filters(&pass_filter, &active_filter);
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#endif
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for (i = 0; (protp = protocols[i]) != NULL; ++i)
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if (protp->protocol < 0xC000 && protp->enabled_flag
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&& protp->open != NULL) {
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(*protp->open)(unit);
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if (protp->protocol != PPP_CCP)
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++num_np_open;
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}
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if (num_np_open == 0)
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/* nothing to do */
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lcp_close(0, "No network protocols running");
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}
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/*
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* The peer has failed to authenticate himself using `protocol'.
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*/
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void
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auth_peer_fail(unit, protocol)
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int unit, protocol;
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{
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/*
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* Authentication failure: take the link down
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*/
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lcp_close(unit, "Authentication failed");
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}
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/*
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* The peer has been successfully authenticated using `protocol'.
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*/
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void
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auth_peer_success(unit, protocol, name, namelen)
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int unit, protocol;
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char *name;
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int namelen;
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{
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int bit;
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switch (protocol) {
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case PPP_CHAP:
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bit = CHAP_PEER;
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break;
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case PPP_PAP:
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bit = PAP_PEER;
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break;
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default:
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syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
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protocol);
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return;
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}
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/*
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* Save the authenticated name of the peer for later.
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*/
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if (namelen > sizeof(peer_authname) - 1)
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namelen = sizeof(peer_authname) - 1;
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BCOPY(name, peer_authname, namelen);
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peer_authname[namelen] = 0;
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/*
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* If we have overridden addresses based on auth info
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* then set that information now before continuing.
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*/
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auth_set_ip_addr(unit);
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/*
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* If there is no more authentication still to be done,
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* proceed to the network (or callback) phase.
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*/
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if ((auth_pending[unit] &= ~bit) == 0)
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network_phase(unit);
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}
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/*
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* We have failed to authenticate ourselves to the peer using `protocol'.
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*/
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void
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auth_withpeer_fail(unit, protocol)
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int unit, protocol;
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{
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if (passwd_from_file)
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BZERO(passwd, MAXSECRETLEN);
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/*
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* We've failed to authenticate ourselves to our peer.
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* He'll probably take the link down, and there's not much
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* we can do except wait for that.
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*/
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}
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/*
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* We have successfully authenticated ourselves with the peer using `protocol'.
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*/
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void
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auth_withpeer_success(unit, protocol)
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int unit, protocol;
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{
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int bit;
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switch (protocol) {
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case PPP_CHAP:
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bit = CHAP_WITHPEER;
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break;
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case PPP_PAP:
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if (passwd_from_file)
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BZERO(passwd, MAXSECRETLEN);
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bit = PAP_WITHPEER;
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break;
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default:
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syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
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protocol);
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bit = 0;
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}
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/*
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* If we have overridden addresses based on auth info
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* then set that information now before continuing.
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*/
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auth_set_ip_addr(unit);
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/*
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* If there is no more authentication still being done,
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* proceed to the network (or callback) phase.
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*/
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if ((auth_pending[unit] &= ~bit) == 0)
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network_phase(unit);
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}
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/*
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* np_up - a network protocol has come up.
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*/
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void
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np_up(unit, proto)
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int unit, proto;
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{
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if (num_np_up == 0) {
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/*
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* At this point we consider that the link has come up successfully.
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*/
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need_holdoff = 0;
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if (idle_time_limit > 0)
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TIMEOUT(check_idle, NULL, idle_time_limit);
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/*
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* Set a timeout to close the connection once the maximum
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* connect time has expired.
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*/
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if (maxconnect > 0)
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TIMEOUT(connect_time_expired, 0, maxconnect);
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}
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++num_np_up;
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}
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/*
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* np_down - a network protocol has gone down.
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*/
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void
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np_down(unit, proto)
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int unit, proto;
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{
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if (--num_np_up == 0 && idle_time_limit > 0) {
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UNTIMEOUT(check_idle, NULL);
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}
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}
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/*
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* np_finished - a network protocol has finished using the link.
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*/
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void
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np_finished(unit, proto)
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int unit, proto;
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{
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if (--num_np_open <= 0) {
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/* no further use for the link: shut up shop. */
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lcp_close(0, "No network protocols running");
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}
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}
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/*
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* check_idle - check whether the link has been idle for long
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* enough that we can shut it down.
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*/
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static void
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check_idle(arg)
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void *arg;
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{
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struct ppp_idle idle;
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time_t itime;
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if (!get_idle_time(0, &idle))
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return;
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itime = MIN(idle.xmit_idle, idle.recv_idle);
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if (itime >= idle_time_limit) {
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/* link is idle: shut it down. */
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syslog(LOG_INFO, "Terminating connection due to lack of activity.");
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lcp_close(0, "Link inactive");
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} else {
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TIMEOUT(check_idle, NULL, idle_time_limit - itime);
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}
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}
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|
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/*
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* connect_time_expired - log a message and close the connection.
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|
*/
|
|
static void
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connect_time_expired(arg)
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void *arg;
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{
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syslog(LOG_INFO, "Connect time expired");
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lcp_close(0, "Connect time expired"); /* Close connection */
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|
}
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|
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/*
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* auth_check_options - called to check authentication options.
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*/
|
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void
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auth_check_options()
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{
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lcp_options *wo = &lcp_wantoptions[0];
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int can_auth;
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ipcp_options *ipwo = &ipcp_wantoptions[0];
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u_int32_t remote;
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|
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/* Default our_name to hostname, and user to our_name */
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if (our_name[0] == 0 || usehostname)
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strcpy(our_name, hostname);
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if (user[0] == 0)
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strcpy(user, our_name);
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|
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/* If authentication is required, ask peer for CHAP or PAP. */
|
|
if (auth_required && !wo->neg_chap && !wo->neg_upap) {
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wo->neg_chap = 1;
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wo->neg_upap = 1;
|
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}
|
|
|
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/*
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|
* Check whether we have appropriate secrets to use
|
|
* to authenticate the peer.
|
|
*/
|
|
can_auth = wo->neg_upap && (uselogin || have_pap_secret());
|
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if (!can_auth && wo->neg_chap) {
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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;
|
|
{
|
|
int ret;
|
|
char *filename;
|
|
FILE *f;
|
|
struct wordlist *addrs;
|
|
u_int32_t remote;
|
|
ipcp_options *ipwo = &ipcp_wantoptions[unit];
|
|
char passwd[256], user[256];
|
|
char secret[MAXWORDLEN];
|
|
static int attempts = 0;
|
|
int len;
|
|
|
|
/*
|
|
* Make copies of apasswd and auser, then null-terminate them.
|
|
*/
|
|
len = MIN(passwdlen, sizeof(passwd) - 1);
|
|
BCOPY(apasswd, passwd, len);
|
|
passwd[len] = '\0';
|
|
len = MIN(userlen, sizeof(user) - 1);
|
|
BCOPY(auser, user, len);
|
|
user[len] = '\0';
|
|
*msg = (char *) 0;
|
|
|
|
/*
|
|
* Open the file of pap secrets and scan for a suitable secret
|
|
* for authenticating this user.
|
|
*/
|
|
filename = _PATH_UPAPFILE;
|
|
addrs = NULL;
|
|
ret = UPAP_AUTHACK;
|
|
f = fopen(filename, "r");
|
|
if (f == NULL) {
|
|
syslog(LOG_ERR, "Can't open PAP password file %s: %m", filename);
|
|
ret = UPAP_AUTHNAK;
|
|
|
|
} else {
|
|
check_access(f, filename);
|
|
remote = ipwo->accept_remote? 0: ipwo->hisaddr;
|
|
if (scan_authfile(f, user, our_name, remote,
|
|
secret, &addrs, filename) < 0
|
|
|| (secret[0] != 0 && (cryptpap || strcmp(passwd, secret) != 0)
|
|
&& strcmp(crypt(passwd, secret), secret) != 0)) {
|
|
syslog(LOG_WARNING, "PAP authentication failure for %s", user);
|
|
ret = UPAP_AUTHNAK;
|
|
}
|
|
fclose(f);
|
|
}
|
|
|
|
if (uselogin && ret == UPAP_AUTHACK) {
|
|
ret = ppplogin(user, passwd, msg, msglen);
|
|
if (ret == UPAP_AUTHNAK) {
|
|
syslog(LOG_WARNING, "PAP login failure for %s", user);
|
|
}
|
|
}
|
|
|
|
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) {
|
|
syslog(LOG_WARNING, "%d LOGIN FAILURES ON %s, %s",
|
|
attempts, devnam, user);
|
|
quit();
|
|
}
|
|
if (attempts > 3)
|
|
sleep((u_int) (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;
|
|
}
|
|
|
|
/*
|
|
* Check if an "entry" is in the file "fname" - used by ppplogin.
|
|
* Taken from libexec/ftpd/ftpd.c
|
|
* Returns: 0 if not found, 1 if found, 2 if file can't be opened for reading.
|
|
*/
|
|
static int
|
|
checkfile(fname, name)
|
|
char *fname;
|
|
char *name;
|
|
{
|
|
FILE *fd;
|
|
int found = 0;
|
|
char *p, line[BUFSIZ];
|
|
|
|
if ((fd = fopen(fname, "r")) != NULL) {
|
|
while (fgets(line, sizeof(line), fd) != NULL)
|
|
if ((p = strchr(line, '\n')) != NULL) {
|
|
*p = '\0';
|
|
if (line[0] == '#')
|
|
continue;
|
|
if (strcmp(line, name) == 0) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
(void) fclose(fd);
|
|
} else {
|
|
return(2);
|
|
}
|
|
return (found);
|
|
}
|
|
|
|
/*
|
|
* This function is needed for PAM. However, it should not be called.
|
|
* If it is, return the error code.
|
|
*/
|
|
|
|
#ifdef USE_PAM
|
|
static int pam_conv(int num_msg, const struct pam_message **msg,
|
|
struct pam_response **resp, void *appdata_ptr)
|
|
{
|
|
return PAM_CONV_ERR;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* ppplogin - 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.
|
|
*
|
|
* UPAP_AUTHACK should only be returned *after* wtmp and utmp are updated.
|
|
*/
|
|
|
|
static int
|
|
ppplogin(user, passwd, msg, msglen)
|
|
char *user;
|
|
char *passwd;
|
|
char **msg;
|
|
int *msglen;
|
|
{
|
|
char *tty;
|
|
|
|
#ifdef USE_PAM
|
|
struct pam_conv pam_conversation;
|
|
pam_handle_t *pamh;
|
|
int pam_error;
|
|
char *pass;
|
|
char *dev;
|
|
/*
|
|
* Fill the pam_conversion structure
|
|
*/
|
|
memset (&pam_conversation, '\0', sizeof (struct pam_conv));
|
|
pam_conversation.conv = &pam_conv;
|
|
|
|
pam_error = pam_start ("ppp", user, &pam_conversation, &pamh);
|
|
if (pam_error != PAM_SUCCESS) {
|
|
*msg = (char *) pam_strerror (pam_error);
|
|
return UPAP_AUTHNAK;
|
|
}
|
|
/*
|
|
* Define the fields for the credintial validation
|
|
*/
|
|
(void) pam_set_item (pamh, PAM_AUTHTOK, passwd);
|
|
(void) pam_set_item (pamh, PAM_TTY, devnam);
|
|
/*
|
|
* Validate the user
|
|
*/
|
|
pam_error = pam_authenticate (pamh, PAM_SILENT);
|
|
if (pam_error == PAM_SUCCESS)
|
|
pam_error = pam_acct_mgmt (pamh, PAM_SILENT);
|
|
|
|
*msg = (char *) pam_strerror (pam_error);
|
|
/*
|
|
* Clean up the mess
|
|
*/
|
|
(void) pam_end (pamh, pam_error);
|
|
|
|
if (pam_error != PAM_SUCCESS)
|
|
return UPAP_AUTHNAK;
|
|
/*
|
|
* Use the non-PAM methods directly
|
|
*/
|
|
#else /* #ifdef USE_PAM */
|
|
|
|
struct passwd *pw;
|
|
struct utmp utmp;
|
|
struct timeval tp;
|
|
char *epasswd;
|
|
|
|
#ifdef HAS_SHADOW
|
|
struct spwd *spwd;
|
|
struct spwd *getspnam();
|
|
extern int isexpired (struct passwd *, struct spwd *); /* in libshadow.a */
|
|
#endif
|
|
|
|
pw = getpwnam(user);
|
|
if (pw == NULL) {
|
|
return (UPAP_AUTHNAK);
|
|
}
|
|
/*
|
|
* Check that the user is not listed in /etc/ppp/ppp.deny
|
|
* and that the user's shell is listed in /etc/ppp/ppp.shells
|
|
* if /etc/ppp/ppp.shells exists.
|
|
*/
|
|
|
|
if (checkfile(_PATH_PPPDENY, user) == 1) {
|
|
syslog(LOG_WARNING, "upap user %s: login denied in %s",
|
|
user, _PATH_PPPDENY);
|
|
return (UPAP_AUTHNAK);
|
|
}
|
|
|
|
if (checkfile(_PATH_PPPSHELLS, pw->pw_shell) == 0) {
|
|
syslog(LOG_WARNING, "upap user %s: shell %s not in %s",
|
|
user, pw->pw_shell, _PATH_PPPSHELLS);
|
|
return (UPAP_AUTHNAK);
|
|
}
|
|
|
|
#ifdef HAS_SHADOW
|
|
spwd = getspnam(user);
|
|
endspent();
|
|
if (spwd) {
|
|
/* check the age of the password entry */
|
|
if (isexpired(pw, spwd)) {
|
|
syslog(LOG_WARNING,"Expired password for %s",user);
|
|
return (UPAP_AUTHNAK);
|
|
}
|
|
pw->pw_passwd = spwd->sp_pwdp;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* If no passwd, don't let them login.
|
|
*/
|
|
if (pw->pw_passwd[0] != '\0') {
|
|
|
|
#ifdef HAS_SHADOW
|
|
if ((pw->pw_passwd && pw->pw_passwd[0] == '@'
|
|
&& pw_auth (pw->pw_passwd+1, pw->pw_name, PW_PPP, NULL))
|
|
|| !valid (passwd, pw)) {
|
|
return (UPAP_AUTHNAK);
|
|
}
|
|
#else
|
|
epasswd = crypt(passwd, pw->pw_passwd);
|
|
if (strcmp(epasswd, pw->pw_passwd)) {
|
|
return (UPAP_AUTHNAK);
|
|
}
|
|
#endif
|
|
|
|
if (pw->pw_expire) {
|
|
(void)gettimeofday(&tp, (struct timezone *)NULL);
|
|
if (tp.tv_sec >= pw->pw_expire) {
|
|
syslog(LOG_INFO, "pap user %s account expired", user);
|
|
return (UPAP_AUTHNAK);
|
|
}
|
|
}
|
|
} /* if password */
|
|
#endif /* #ifdef USE_PAM */
|
|
|
|
syslog(LOG_INFO, "user %s logged in", user);
|
|
|
|
/* Log in wtmp and utmp using login() */
|
|
|
|
tty = devnam;
|
|
if (strncmp(tty, "/dev/", 5) == 0)
|
|
tty += 5;
|
|
|
|
if (logout(tty)) /* Already entered (by login?) */
|
|
logwtmp(tty, "", "");
|
|
|
|
logged_in = TRUE;
|
|
|
|
memset((void *)&utmp, 0, sizeof(utmp));
|
|
(void)time(&utmp.ut_time);
|
|
(void)strncpy(utmp.ut_name, user, sizeof(utmp.ut_name));
|
|
(void)strncpy(utmp.ut_host, ":PPP", sizeof(utmp.ut_host));
|
|
(void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
|
|
login(&utmp); /* This logs us in wtmp too */
|
|
|
|
return (UPAP_AUTHACK);
|
|
}
|
|
|
|
/*
|
|
* ppplogout - Logout the user.
|
|
*/
|
|
static void
|
|
ppplogout()
|
|
{
|
|
char *tty;
|
|
|
|
tty = devnam;
|
|
if (strncmp(tty, "/dev/", 5) == 0)
|
|
tty += 5;
|
|
logwtmp(tty, "", ""); /* Wipe out wtmp logout entry */
|
|
logged_in = FALSE;
|
|
|
|
logout(tty); /* Wipe out utmp */
|
|
}
|
|
|
|
|
|
/*
|
|
* 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;
|
|
char secret[MAXWORDLEN];
|
|
|
|
/*
|
|
* Open the file of pap secrets and scan for a suitable secret.
|
|
* We don't accept a wildcard client.
|
|
*/
|
|
filename = _PATH_UPAPFILE;
|
|
addrs = NULL;
|
|
f = fopen(filename, "r");
|
|
if (f == NULL)
|
|
return 0;
|
|
check_access(f, filename);
|
|
|
|
i = scan_authfile(f, "", our_name, (u_int32_t)0, secret, &addrs, filename);
|
|
ret = i >= 0 && (i & NONWILD_CLIENT) != 0 && secret[0] == 0;
|
|
BZERO(secret, sizeof(secret));
|
|
|
|
if (ret)
|
|
set_allowed_addrs(unit, addrs);
|
|
else
|
|
free_wordlist(addrs);
|
|
|
|
fclose(f);
|
|
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.
|
|
*/
|
|
static int
|
|
get_pap_passwd(passwd)
|
|
char *passwd;
|
|
{
|
|
char *filename;
|
|
FILE *f;
|
|
int ret;
|
|
struct wordlist *addrs;
|
|
char secret[MAXWORDLEN];
|
|
|
|
filename = _PATH_UPAPFILE;
|
|
addrs = NULL;
|
|
f = fopen(filename, "r");
|
|
if (f == NULL)
|
|
return 0;
|
|
check_access(f, filename);
|
|
ret = scan_authfile(f, user,
|
|
remote_name[0]? remote_name: NULL,
|
|
(u_int32_t)0, secret, NULL, filename);
|
|
fclose(f);
|
|
if (ret < 0)
|
|
return 0;
|
|
if (passwd != NULL) {
|
|
strncpy(passwd, secret, MAXSECRETLEN);
|
|
passwd[MAXSECRETLEN-1] = 0;
|
|
}
|
|
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()
|
|
{
|
|
FILE *f;
|
|
int ret;
|
|
char *filename;
|
|
ipcp_options *ipwo = &ipcp_wantoptions[0];
|
|
u_int32_t remote;
|
|
|
|
filename = _PATH_UPAPFILE;
|
|
f = fopen(filename, "r");
|
|
if (f == NULL)
|
|
return 0;
|
|
|
|
remote = ipwo->accept_remote? 0: ipwo->hisaddr;
|
|
ret = scan_authfile(f, NULL, our_name, remote, NULL, NULL, filename);
|
|
fclose(f);
|
|
if (ret < 0)
|
|
return 0;
|
|
|
|
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;
|
|
{
|
|
FILE *f;
|
|
int ret;
|
|
char *filename;
|
|
|
|
filename = _PATH_CHAPFILE;
|
|
f = fopen(filename, "r");
|
|
if (f == NULL)
|
|
return 0;
|
|
|
|
if (client[0] == 0)
|
|
client = NULL;
|
|
else if (server[0] == 0)
|
|
server = NULL;
|
|
|
|
ret = scan_authfile(f, client, server, remote, NULL, NULL, filename);
|
|
fclose(f);
|
|
if (ret < 0)
|
|
return 0;
|
|
|
|
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;
|
|
{
|
|
FILE *f;
|
|
int ret, len;
|
|
char *filename;
|
|
struct wordlist *addrs;
|
|
char secbuf[MAXWORDLEN];
|
|
|
|
filename = _PATH_CHAPFILE;
|
|
addrs = NULL;
|
|
secbuf[0] = 0;
|
|
|
|
f = fopen(filename, "r");
|
|
if (f == NULL) {
|
|
syslog(LOG_ERR, "Can't open chap secret file %s: %m", filename);
|
|
return 0;
|
|
}
|
|
check_access(f, filename);
|
|
|
|
ret = scan_authfile(f, client, server, (u_int32_t)0,
|
|
secbuf, &addrs, filename);
|
|
fclose(f);
|
|
if (ret < 0)
|
|
return 0;
|
|
|
|
if (save_addrs)
|
|
set_allowed_addrs(unit, addrs);
|
|
|
|
len = strlen(secbuf);
|
|
if (len > MAXSECRETLEN) {
|
|
syslog(LOG_ERR, "Secret for %s on %s is too long", client, server);
|
|
len = MAXSECRETLEN;
|
|
}
|
|
BCOPY(secbuf, secret, len);
|
|
BZERO(secbuf, sizeof(secbuf));
|
|
*secret_len = len;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* set_allowed_addrs() - set the list of allowed addresses.
|
|
*/
|
|
static void
|
|
set_allowed_addrs(unit, addrs)
|
|
int unit;
|
|
struct wordlist *addrs;
|
|
{
|
|
if (addresses[unit] != NULL)
|
|
free_wordlist(addresses[unit]);
|
|
addresses[unit] = addrs;
|
|
|
|
/*
|
|
* 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];
|
|
u_int32_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 = *(u_int32_t *)hp->h_addr;
|
|
else
|
|
a = inet_addr(p);
|
|
if (a != (u_int32_t) -1)
|
|
wo->hisaddr = a;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
auth_set_ip_addr(unit)
|
|
int unit;
|
|
{
|
|
struct wordlist *addrs;
|
|
|
|
if (non_wildclient && (addrs = addresses[unit]) != NULL) {
|
|
for (; addrs != NULL; addrs = addrs->next) {
|
|
/* Look for address overrides, and set them if we have any */
|
|
if (strchr(addrs->word, ':') != NULL) {
|
|
if (setipaddr(addrs->word))
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
{
|
|
int x, y;
|
|
u_int32_t a, mask, ah;
|
|
int accept;
|
|
char *ptr_word, *ptr_mask;
|
|
struct hostent *hp;
|
|
struct netent *np;
|
|
|
|
/* don't allow loopback or multicast address */
|
|
if (bad_ip_adrs(addr))
|
|
return 0;
|
|
|
|
if (addrs == NULL)
|
|
return !auth_required; /* no addresses authorized */
|
|
|
|
x = y = 0;
|
|
for (; addrs != NULL; addrs = addrs->next) {
|
|
y++;
|
|
/* "-" means no addresses authorized, "*" means any address allowed */
|
|
ptr_word = addrs->word;
|
|
if (strcmp(ptr_word, "-") == 0)
|
|
break;
|
|
if (strcmp(ptr_word, "*") == 0)
|
|
return 1;
|
|
|
|
/*
|
|
* A colon in the string means that we wish to force a specific
|
|
* local:remote address, but we ignore these for now.
|
|
*/
|
|
if (strchr(addrs->word, ':') != NULL)
|
|
x++;
|
|
else {
|
|
|
|
accept = 1;
|
|
if (*ptr_word == '!') {
|
|
accept = 0;
|
|
++ptr_word;
|
|
}
|
|
|
|
mask = ~ (u_int32_t) 0;
|
|
ptr_mask = strchr (ptr_word, '/');
|
|
if (ptr_mask != NULL) {
|
|
int bit_count;
|
|
|
|
bit_count = (int) strtol (ptr_mask+1, (char **) 0, 10);
|
|
if (bit_count <= 0 || bit_count > 32) {
|
|
syslog (LOG_WARNING,
|
|
"invalid address length %s in auth. address list",
|
|
ptr_mask);
|
|
continue;
|
|
}
|
|
*ptr_mask = '\0';
|
|
mask <<= 32 - bit_count;
|
|
}
|
|
|
|
hp = gethostbyname(ptr_word);
|
|
if (hp != NULL && hp->h_addrtype == AF_INET) {
|
|
a = *(u_int32_t *)hp->h_addr;
|
|
} else {
|
|
np = getnetbyname (ptr_word);
|
|
if (np != NULL && np->n_addrtype == AF_INET) {
|
|
a = htonl (*(u_int32_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 == (u_int32_t)-1L)
|
|
syslog (LOG_WARNING,
|
|
"unknown host %s in auth. address list",
|
|
addrs->word);
|
|
else
|
|
/* Here a and addr are in network byte order,
|
|
and mask is in host order. */
|
|
if (((addr ^ a) & htonl(mask)) == 0)
|
|
return accept;
|
|
} /* else */
|
|
}
|
|
return x == y; /* not in list => can't have it */
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
{
|
|
struct stat sbuf;
|
|
|
|
if (fstat(fileno(f), &sbuf) < 0) {
|
|
syslog(LOG_WARNING, "cannot stat secret file %s: %m", filename);
|
|
} else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
|
|
syslog(LOG_WARNING, "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 (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;
|
|
{
|
|
int newline, xxx;
|
|
int got_flag, best_flag;
|
|
FILE *sf;
|
|
struct wordlist *ap, *addr_list, *alist, *alast;
|
|
char word[MAXWORDLEN];
|
|
char atfile[MAXWORDLEN];
|
|
char lsecret[MAXWORDLEN];
|
|
|
|
if (addrs != NULL)
|
|
*addrs = 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 (server != NULL && strcmp(word, server) != 0 && !ISWILD(word))
|
|
continue;
|
|
if (!ISWILD(word))
|
|
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;
|
|
|
|
/*
|
|
* Special syntax: @filename means read secret from file.
|
|
*/
|
|
if (word[0] == '@') {
|
|
strcpy(atfile, word+1);
|
|
if ((sf = fopen(atfile, "r")) == NULL) {
|
|
syslog(LOG_WARNING, "can't open indirect secret file %s",
|
|
atfile);
|
|
continue;
|
|
}
|
|
check_access(sf, atfile);
|
|
if (!getword(sf, word, &xxx, atfile)) {
|
|
syslog(LOG_WARNING, "no secret in indirect secret file %s",
|
|
atfile);
|
|
fclose(sf);
|
|
continue;
|
|
}
|
|
fclose(sf);
|
|
}
|
|
if (secret != NULL)
|
|
strcpy(lsecret, word);
|
|
|
|
/*
|
|
* Now read address authorization info and make a wordlist.
|
|
*/
|
|
alist = alast = NULL;
|
|
for (;;) {
|
|
if (!getword(f, word, &newline, filename) || newline)
|
|
break;
|
|
ap = (struct wordlist *) malloc(sizeof(struct wordlist)
|
|
+ strlen(word));
|
|
if (ap == NULL)
|
|
novm("authorized addresses");
|
|
ap->next = NULL;
|
|
strcpy(ap->word, word);
|
|
if (alist == NULL)
|
|
alist = ap;
|
|
else
|
|
alast->next = ap;
|
|
alast = ap;
|
|
}
|
|
|
|
/*
|
|
* Check if the given IP address is allowed by the wordlist.
|
|
*/
|
|
if (ipaddr != 0 && !ip_addr_check(ipaddr, alist)) {
|
|
free_wordlist(alist);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
strcpy(secret, lsecret);
|
|
|
|
if (!newline)
|
|
break;
|
|
}
|
|
|
|
if (addrs != NULL)
|
|
*addrs = addr_list;
|
|
else if (addr_list != NULL)
|
|
free_wordlist(addr_list);
|
|
|
|
non_wildclient = (best_flag & NONWILD_CLIENT) && *client != '\0';
|
|
return best_flag;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
{
|
|
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 {
|
|
sprintf(struid, "%d", getuid());
|
|
user_name = struid;
|
|
}
|
|
sprintf(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;
|
|
|
|
run_program(script, argv, 0);
|
|
}
|