1335 lines
35 KiB
C
1335 lines
35 KiB
C
/*****************************************************************************
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* auth.c - Network Authentication and Phase Control program file.
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*
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* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
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* Copyright (c) 1997 by Global Election Systems Inc. All rights reserved.
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice and the following disclaimer are included verbatim in any
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* distributions. No written agreement, license, or royalty fee is required
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* for any of the authorized uses.
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*
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* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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* REVISION HISTORY
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*
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* 03-01-01 Marc Boucher <marc@mbsi.ca>
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* Ported to lwIP.
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* 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
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* Ported from public pppd code.
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*****************************************************************************/
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/*
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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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#include "lwip/opt.h"
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#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
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#include "ppp.h"
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#include "pppdebug.h"
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#include "fsm.h"
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#include "lcp.h"
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#include "pap.h"
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#include "chap.h"
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#include "auth.h"
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#include "ipcp.h"
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#if CBCP_SUPPORT
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#include "cbcp.h"
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#endif /* CBCP_SUPPORT */
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#include "lwip/inet.h"
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#include <string.h>
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#if 0 /* UNUSED */
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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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#endif /* UNUSED */
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#if PAP_SUPPORT || CHAP_SUPPORT
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/* The name by which the peer authenticated itself to us. */
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static char peer_authname[MAXNAMELEN];
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#endif /* PAP_SUPPORT || CHAP_SUPPORT */
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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 plogin() */
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static int logged_in;
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/* Set if we have run the /etc/ppp/auth-up script. */
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static int did_authup; /* @todo, we don't need this in lwip*/
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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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#if 0 /* UNUSED */
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/* Wordlist giving addresses which the peer may use
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without authenticating itself. */
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static struct wordlist *noauth_addrs;
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/* Extra options to apply, from the secrets file entry for the peer. */
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static struct wordlist *extra_options;
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#endif /* UNUSED */
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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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#if PAP_SUPPORT || CHAP_SUPPORT
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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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#endif /* PAP_SUPPORT || CHAP_SUPPORT */
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#if 0 /* UNUSED */
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/* Set if we require authentication only because we have a default route. */
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static bool default_auth;
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/* Hook to enable a plugin to control the idle time limit */
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int (*idle_time_hook) __P((struct ppp_idle *)) = NULL;
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/* Hook for a plugin to say whether we can possibly authenticate any peer */
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int (*pap_check_hook) __P((void)) = NULL;
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/* Hook for a plugin to check the PAP user and password */
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int (*pap_auth_hook) __P((char *user, char *passwd, char **msgp,
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struct wordlist **paddrs,
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struct wordlist **popts)) = NULL;
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/* Hook for a plugin to know about the PAP user logout */
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void (*pap_logout_hook) __P((void)) = NULL;
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/* Hook for a plugin to get the PAP password for authenticating us */
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int (*pap_passwd_hook) __P((char *user, char *passwd)) = NULL;
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/*
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* This is used to ensure that we don't start an auth-up/down
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* script while one is already running.
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*/
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enum script_state {
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s_down,
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s_up
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};
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static enum script_state auth_state = s_down;
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static enum script_state auth_script_state = s_down;
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static pid_t auth_script_pid = 0;
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/*
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* Option variables.
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* lwip: some of these are present in the ppp_settings structure
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*/
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bool uselogin = 0; /* Use /etc/passwd for checking PAP */
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bool cryptpap = 0; /* Passwords in pap-secrets are encrypted */
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bool refuse_pap = 0; /* Don't wanna auth. ourselves with PAP */
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bool refuse_chap = 0; /* Don't wanna auth. ourselves with CHAP */
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bool usehostname = 0; /* Use hostname for our_name */
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bool auth_required = 0; /* Always require authentication from peer */
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bool allow_any_ip = 0; /* Allow peer to use any IP address */
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bool explicit_remote = 0; /* User specified explicit remote name */
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char remote_name[MAXNAMELEN]; /* Peer's name for authentication */
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#endif /* UNUSED */
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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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/* @todo, move this somewhere */
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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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extern char *crypt (const char *, const char *);
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/* Prototypes for procedures local to this file. */
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static void network_phase (int);
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static void check_idle (void *);
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static void connect_time_expired (void *);
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#if 0
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static int plogin (char *, char *, char **, int *);
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#endif
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static void plogout (void);
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static int null_login (int);
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static int get_pap_passwd (int, char *, char *);
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static int have_pap_secret (void);
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static int have_chap_secret (char *, char *, u32_t);
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static int ip_addr_check (u32_t, struct wordlist *);
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#if 0 /* PAP_SUPPORT || CHAP_SUPPORT */
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static int scan_authfile (FILE *, char *, char *, char *,
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struct wordlist **, struct wordlist **,
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char *);
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static void free_wordlist (struct wordlist *);
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static void auth_script (char *);
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static void auth_script_done (void *);
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static void set_allowed_addrs (int unit, struct wordlist *addrs);
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static int some_ip_ok (struct wordlist *);
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static int setupapfile (char **);
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static int privgroup (char **);
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static int set_noauth_addr (char **);
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static void check_access (FILE *, char *);
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#endif /* 0 */ /* PAP_SUPPORT || CHAP_SUPPORT */
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#if 0 /* UNUSED */
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/*
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* Authentication-related options.
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*/
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option_t auth_options[] = {
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{ "require-pap", o_bool, &lcp_wantoptions[0].neg_upap,
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"Require PAP authentication from peer", 1, &auth_required },
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{ "+pap", o_bool, &lcp_wantoptions[0].neg_upap,
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"Require PAP authentication from peer", 1, &auth_required },
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{ "refuse-pap", o_bool, &refuse_pap,
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"Don't agree to auth to peer with PAP", 1 },
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{ "-pap", o_bool, &refuse_pap,
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"Don't allow PAP authentication with peer", 1 },
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{ "require-chap", o_bool, &lcp_wantoptions[0].neg_chap,
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"Require CHAP authentication from peer", 1, &auth_required },
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{ "+chap", o_bool, &lcp_wantoptions[0].neg_chap,
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"Require CHAP authentication from peer", 1, &auth_required },
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{ "refuse-chap", o_bool, &refuse_chap,
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"Don't agree to auth to peer with CHAP", 1 },
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{ "-chap", o_bool, &refuse_chap,
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"Don't allow CHAP authentication with peer", 1 },
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{ "name", o_string, our_name,
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"Set local name for authentication",
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OPT_PRIV|OPT_STATIC, NULL, MAXNAMELEN },
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{ "user", o_string, user,
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"Set name for auth with peer", OPT_STATIC, NULL, MAXNAMELEN },
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{ "usehostname", o_bool, &usehostname,
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"Must use hostname for authentication", 1 },
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{ "remotename", o_string, remote_name,
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"Set remote name for authentication", OPT_STATIC,
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&explicit_remote, MAXNAMELEN },
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{ "auth", o_bool, &auth_required,
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"Require authentication from peer", 1 },
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{ "noauth", o_bool, &auth_required,
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"Don't require peer to authenticate", OPT_PRIV, &allow_any_ip },
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{ "login", o_bool, &uselogin,
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"Use system password database for PAP", 1 },
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{ "papcrypt", o_bool, &cryptpap,
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"PAP passwords are encrypted", 1 },
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{ "+ua", o_special, (void *)setupapfile,
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"Get PAP user and password from file" },
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{ "password", o_string, passwd,
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"Password for authenticating us to the peer", OPT_STATIC,
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NULL, MAXSECRETLEN },
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{ "privgroup", o_special, (void *)privgroup,
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"Allow group members to use privileged options", OPT_PRIV },
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{ "allow-ip", o_special, (void *)set_noauth_addr,
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"Set IP address(es) which can be used without authentication",
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OPT_PRIV },
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{ NULL }
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};
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#endif /* UNUSED */
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#if 0 /* UNUSED */
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/*
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* setupapfile - specifies UPAP info for authenticating with peer.
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*/
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static int
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setupapfile(char **argv)
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{
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FILE * ufile;
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int l;
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lcp_allowoptions[0].neg_upap = 1;
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/* open user info file */
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seteuid(getuid());
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ufile = fopen(*argv, "r");
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seteuid(0);
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if (ufile == NULL) {
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option_error("unable to open user login data file %s", *argv);
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return 0;
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}
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check_access(ufile, *argv);
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/* get username */
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if (fgets(user, MAXNAMELEN - 1, ufile) == NULL
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|| fgets(passwd, MAXSECRETLEN - 1, ufile) == NULL){
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option_error("unable to read user login data file %s", *argv);
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return 0;
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}
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fclose(ufile);
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/* get rid of newlines */
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l = strlen(user);
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if (l > 0 && user[l-1] == '\n')
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user[l-1] = 0;
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l = strlen(passwd);
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if (l > 0 && passwd[l-1] == '\n')
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passwd[l-1] = 0;
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return (1);
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}
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#endif /* UNUSED */
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#if 0 /* UNUSED */
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/*
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* privgroup - allow members of the group to have privileged access.
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*/
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static int
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privgroup(char **argv)
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{
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struct group *g;
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int i;
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g = getgrnam(*argv);
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if (g == 0) {
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option_error("group %s is unknown", *argv);
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return 0;
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}
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for (i = 0; i < ngroups; ++i) {
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if (groups[i] == g->gr_gid) {
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privileged = 1;
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break;
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}
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}
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return 1;
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}
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#endif
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#if 0 /* UNUSED */
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/*
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* set_noauth_addr - set address(es) that can be used without authentication.
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* Equivalent to specifying an entry like `"" * "" addr' in pap-secrets.
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*/
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static int
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set_noauth_addr(char **argv)
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{
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char *addr = *argv;
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int l = strlen(addr);
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struct wordlist *wp;
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wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l + 1);
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if (wp == NULL)
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novm("allow-ip argument");
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wp->word = (char *) (wp + 1);
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wp->next = noauth_addrs;
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BCOPY(addr, wp->word, l);
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noauth_addrs = wp;
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return 1;
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}
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#endif /* UNUSED */
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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(int unit)
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{
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LWIP_UNUSED_ARG(unit);
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AUTHDEBUG(LOG_INFO, ("link_required: %d\n", unit));
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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(int unit)
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{
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AUTHDEBUG(LOG_INFO, ("link_terminated: %d\n", unit));
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if (lcp_phase[unit] == PHASE_DEAD) {
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return;
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}
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if (logged_in) {
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plogout();
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}
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lcp_phase[unit] = PHASE_DEAD;
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AUTHDEBUG(LOG_NOTICE, ("Connection terminated.\n"));
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pppLinkTerminated(unit);
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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(int unit)
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{
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int i;
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struct protent *protp;
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AUTHDEBUG(LOG_INFO, ("link_down: %d\n", unit));
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if (did_authup) {
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/* XXX Do link down processing. */
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did_authup = 0;
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}
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for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) {
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if (!protp->enabled_flag) {
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continue;
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}
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if (protp->protocol != PPP_LCP && protp->lowerdown != NULL) {
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(*protp->lowerdown)(unit);
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}
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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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}
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num_np_open = 0; /* number of network protocols we have opened */
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num_np_up = 0; /* Number of network protocols which have come up */
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if (lcp_phase[unit] != PHASE_DEAD) {
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lcp_phase[unit] = PHASE_TERMINATE;
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}
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pppLinkDown(unit);
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}
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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(int unit)
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{
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int auth;
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int i;
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struct protent *protp;
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lcp_options *wo = &lcp_wantoptions[unit];
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lcp_options *go = &lcp_gotoptions[unit];
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#if PAP_SUPPORT || CHAP_SUPPORT
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lcp_options *ho = &lcp_hisoptions[unit];
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#endif /* PAP_SUPPORT || CHAP_SUPPORT */
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AUTHDEBUG(LOG_INFO, ("link_established: unit %d; Lowering up all protocols...\n", unit));
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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 = ppp_protocols[i]) != NULL; ++i) {
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if (protp->protocol != PPP_LCP && protp->enabled_flag && protp->lowerup != NULL) {
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(*protp->lowerup)(unit);
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}
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}
|
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if (ppp_settings.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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AUTHDEBUG(LOG_WARNING, ("peer refused to authenticate\n"));
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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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|
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lcp_phase[unit] = PHASE_AUTHENTICATE;
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auth = 0;
|
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#if CHAP_SUPPORT
|
|
if (go->neg_chap) {
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ChapAuthPeer(unit, ppp_settings.our_name, go->chap_mdtype);
|
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auth |= CHAP_PEER;
|
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}
|
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#endif /* CHAP_SUPPORT */
|
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#if PAP_SUPPORT && CHAP_SUPPORT
|
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else
|
|
#endif /* PAP_SUPPORT && CHAP_SUPPORT */
|
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#if PAP_SUPPORT
|
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if (go->neg_upap) {
|
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upap_authpeer(unit);
|
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auth |= PAP_PEER;
|
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}
|
|
#endif /* PAP_SUPPORT */
|
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#if CHAP_SUPPORT
|
|
if (ho->neg_chap) {
|
|
ChapAuthWithPeer(unit, ppp_settings.user, ho->chap_mdtype);
|
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auth |= CHAP_WITHPEER;
|
|
}
|
|
#endif /* CHAP_SUPPORT */
|
|
#if PAP_SUPPORT && CHAP_SUPPORT
|
|
else
|
|
#endif /* PAP_SUPPORT && CHAP_SUPPORT */
|
|
#if PAP_SUPPORT
|
|
if (ho->neg_upap) {
|
|
if (ppp_settings.passwd[0] == 0) {
|
|
passwd_from_file = 1;
|
|
if (!get_pap_passwd(unit, ppp_settings.user, ppp_settings.passwd)) {
|
|
AUTHDEBUG(LOG_ERR, ("No secret found for PAP login\n"));
|
|
}
|
|
}
|
|
upap_authwithpeer(unit, ppp_settings.user, ppp_settings.passwd);
|
|
auth |= PAP_WITHPEER;
|
|
}
|
|
#endif /* PAP_SUPPORT */
|
|
auth_pending[unit] = auth;
|
|
|
|
if (!auth) {
|
|
network_phase(unit);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Proceed to the network phase.
|
|
*/
|
|
static void
|
|
network_phase(int unit)
|
|
{
|
|
int i;
|
|
struct protent *protp;
|
|
lcp_options *go = &lcp_gotoptions[unit];
|
|
|
|
/*
|
|
* If the peer had to authenticate, run the auth-up script now.
|
|
*/
|
|
if ((go->neg_chap || go->neg_upap) && !did_authup) {
|
|
/* XXX Do setup for peer authentication. */
|
|
did_authup = 1;
|
|
}
|
|
|
|
#if CBCP_SUPPORT
|
|
/*
|
|
* If we negotiated callback, do it now.
|
|
*/
|
|
if (go->neg_cbcp) {
|
|
lcp_phase[unit] = PHASE_CALLBACK;
|
|
(*cbcp_protent.open)(unit);
|
|
return;
|
|
}
|
|
#endif /* CBCP_SUPPORT */
|
|
|
|
lcp_phase[unit] = PHASE_NETWORK;
|
|
for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) {
|
|
if (protp->protocol < 0xC000 && protp->enabled_flag && protp->open != NULL) {
|
|
(*protp->open)(unit);
|
|
if (protp->protocol != PPP_CCP) {
|
|
++num_np_open;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (num_np_open == 0) {
|
|
/* nothing to do */
|
|
lcp_close(0, "No network protocols running");
|
|
}
|
|
}
|
|
/* @todo: add void start_networks(void) here (pppd 2.3.11) */
|
|
|
|
/*
|
|
* The peer has failed to authenticate himself using `protocol'.
|
|
*/
|
|
void
|
|
auth_peer_fail(int unit, u16_t protocol)
|
|
{
|
|
LWIP_UNUSED_ARG(protocol);
|
|
|
|
AUTHDEBUG(LOG_INFO, ("auth_peer_fail: %d proto=%X\n", unit, protocol));
|
|
/*
|
|
* Authentication failure: take the link down
|
|
*/
|
|
lcp_close(unit, "Authentication failed");
|
|
}
|
|
|
|
|
|
#if PAP_SUPPORT || CHAP_SUPPORT
|
|
/*
|
|
* The peer has been successfully authenticated using `protocol'.
|
|
*/
|
|
void
|
|
auth_peer_success(int unit, u16_t protocol, char *name, int namelen)
|
|
{
|
|
int pbit;
|
|
|
|
AUTHDEBUG(LOG_INFO, ("auth_peer_success: %d proto=%X\n", unit, protocol));
|
|
switch (protocol) {
|
|
case PPP_CHAP:
|
|
pbit = CHAP_PEER;
|
|
break;
|
|
case PPP_PAP:
|
|
pbit = PAP_PEER;
|
|
break;
|
|
default:
|
|
AUTHDEBUG(LOG_WARNING, ("auth_peer_success: unknown protocol %x\n", protocol));
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Save the authenticated name of the peer for later.
|
|
*/
|
|
if (namelen > (int)sizeof(peer_authname) - 1) {
|
|
namelen = sizeof(peer_authname) - 1;
|
|
}
|
|
BCOPY(name, peer_authname, namelen);
|
|
peer_authname[namelen] = 0;
|
|
|
|
/*
|
|
* If there is no more authentication still to be done,
|
|
* proceed to the network (or callback) phase.
|
|
*/
|
|
if ((auth_pending[unit] &= ~pbit) == 0) {
|
|
network_phase(unit);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We have failed to authenticate ourselves to the peer using `protocol'.
|
|
*/
|
|
void
|
|
auth_withpeer_fail(int unit, u16_t protocol)
|
|
{
|
|
int errCode = PPPERR_AUTHFAIL;
|
|
|
|
LWIP_UNUSED_ARG(protocol);
|
|
|
|
AUTHDEBUG(LOG_INFO, ("auth_withpeer_fail: %d proto=%X\n", unit, protocol));
|
|
if (passwd_from_file) {
|
|
BZERO(ppp_settings.passwd, MAXSECRETLEN);
|
|
}
|
|
|
|
/*
|
|
* We've failed to authenticate ourselves to our peer.
|
|
* He'll probably take the link down, and there's not much
|
|
* we can do except wait for that.
|
|
*/
|
|
pppIOCtl(unit, PPPCTLS_ERRCODE, &errCode);
|
|
lcp_close(unit, "Failed to authenticate ourselves to peer");
|
|
}
|
|
|
|
/*
|
|
* We have successfully authenticated ourselves with the peer using `protocol'.
|
|
*/
|
|
void
|
|
auth_withpeer_success(int unit, u16_t protocol)
|
|
{
|
|
int pbit;
|
|
|
|
AUTHDEBUG(LOG_INFO, ("auth_withpeer_success: %d proto=%X\n", unit, protocol));
|
|
switch (protocol) {
|
|
case PPP_CHAP:
|
|
pbit = CHAP_WITHPEER;
|
|
break;
|
|
case PPP_PAP:
|
|
if (passwd_from_file) {
|
|
BZERO(ppp_settings.passwd, MAXSECRETLEN);
|
|
}
|
|
pbit = PAP_WITHPEER;
|
|
break;
|
|
default:
|
|
AUTHDEBUG(LOG_WARNING, ("auth_peer_success: unknown protocol %x\n", protocol));
|
|
pbit = 0;
|
|
}
|
|
|
|
/*
|
|
* If there is no more authentication still being done,
|
|
* proceed to the network (or callback) phase.
|
|
*/
|
|
if ((auth_pending[unit] &= ~pbit) == 0) {
|
|
network_phase(unit);
|
|
}
|
|
}
|
|
#endif /* PAP_SUPPORT || CHAP_SUPPORT */
|
|
|
|
|
|
/*
|
|
* np_up - a network protocol has come up.
|
|
*/
|
|
void
|
|
np_up(int unit, u16_t proto)
|
|
{
|
|
LWIP_UNUSED_ARG(unit);
|
|
LWIP_UNUSED_ARG(proto);
|
|
|
|
AUTHDEBUG(LOG_INFO, ("np_up: %d proto=%X\n", unit, proto));
|
|
if (num_np_up == 0) {
|
|
AUTHDEBUG(LOG_INFO, ("np_up: maxconnect=%d idle_time_limit=%d\n",ppp_settings.maxconnect,ppp_settings.idle_time_limit));
|
|
/*
|
|
* At this point we consider that the link has come up successfully.
|
|
*/
|
|
if (ppp_settings.idle_time_limit > 0) {
|
|
TIMEOUT(check_idle, NULL, ppp_settings.idle_time_limit);
|
|
}
|
|
|
|
/*
|
|
* Set a timeout to close the connection once the maximum
|
|
* connect time has expired.
|
|
*/
|
|
if (ppp_settings.maxconnect > 0) {
|
|
TIMEOUT(connect_time_expired, 0, ppp_settings.maxconnect);
|
|
}
|
|
}
|
|
++num_np_up;
|
|
}
|
|
|
|
/*
|
|
* np_down - a network protocol has gone down.
|
|
*/
|
|
void
|
|
np_down(int unit, u16_t proto)
|
|
{
|
|
LWIP_UNUSED_ARG(unit);
|
|
LWIP_UNUSED_ARG(proto);
|
|
|
|
AUTHDEBUG(LOG_INFO, ("np_down: %d proto=%X\n", unit, proto));
|
|
if (--num_np_up == 0 && ppp_settings.idle_time_limit > 0) {
|
|
UNTIMEOUT(check_idle, NULL);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* np_finished - a network protocol has finished using the link.
|
|
*/
|
|
void
|
|
np_finished(int unit, u16_t proto)
|
|
{
|
|
LWIP_UNUSED_ARG(unit);
|
|
LWIP_UNUSED_ARG(proto);
|
|
|
|
AUTHDEBUG(LOG_INFO, ("np_finished: %d proto=%X\n", unit, proto));
|
|
if (--num_np_open <= 0) {
|
|
/* no further use for the link: shut up shop. */
|
|
lcp_close(0, "No network protocols running");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* check_idle - check whether the link has been idle for long
|
|
* enough that we can shut it down.
|
|
*/
|
|
static void
|
|
check_idle(void *arg)
|
|
{
|
|
struct ppp_idle idle;
|
|
u_short itime;
|
|
|
|
LWIP_UNUSED_ARG(arg);
|
|
if (!get_idle_time(0, &idle)) {
|
|
return;
|
|
}
|
|
itime = LWIP_MIN(idle.xmit_idle, idle.recv_idle);
|
|
if (itime >= ppp_settings.idle_time_limit) {
|
|
/* link is idle: shut it down. */
|
|
AUTHDEBUG(LOG_INFO, ("Terminating connection due to lack of activity.\n"));
|
|
lcp_close(0, "Link inactive");
|
|
} else {
|
|
TIMEOUT(check_idle, NULL, ppp_settings.idle_time_limit - itime);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* connect_time_expired - log a message and close the connection.
|
|
*/
|
|
static void
|
|
connect_time_expired(void *arg)
|
|
{
|
|
LWIP_UNUSED_ARG(arg);
|
|
|
|
AUTHDEBUG(LOG_INFO, ("Connect time expired\n"));
|
|
lcp_close(0, "Connect time expired"); /* Close connection */
|
|
}
|
|
|
|
#if 0 /* UNUSED */
|
|
/*
|
|
* auth_check_options - called to check authentication options.
|
|
*/
|
|
void
|
|
auth_check_options(void)
|
|
{
|
|
lcp_options *wo = &lcp_wantoptions[0];
|
|
int can_auth;
|
|
ipcp_options *ipwo = &ipcp_wantoptions[0];
|
|
u32_t remote;
|
|
|
|
/* Default our_name to hostname, and user to our_name */
|
|
if (ppp_settings.our_name[0] == 0 || ppp_settings.usehostname) {
|
|
strcpy(ppp_settings.our_name, ppp_settings.hostname);
|
|
}
|
|
|
|
if (ppp_settings.user[0] == 0) {
|
|
strcpy(ppp_settings.user, ppp_settings.our_name);
|
|
}
|
|
|
|
/* If authentication is required, ask peer for CHAP or PAP. */
|
|
if (ppp_settings.auth_required && !wo->neg_chap && !wo->neg_upap) {
|
|
wo->neg_chap = 1;
|
|
wo->neg_upap = 1;
|
|
}
|
|
|
|
/*
|
|
* Check whether we have appropriate secrets to use
|
|
* to authenticate the peer.
|
|
*/
|
|
can_auth = wo->neg_upap && have_pap_secret();
|
|
if (!can_auth && wo->neg_chap) {
|
|
remote = ipwo->accept_remote? 0: ipwo->hisaddr;
|
|
can_auth = have_chap_secret(ppp_settings.remote_name, ppp_settings.our_name, remote);
|
|
}
|
|
|
|
if (ppp_settings.auth_required && !can_auth) {
|
|
ppp_panic("No auth secret");
|
|
}
|
|
}
|
|
#endif /* UNUSED */
|
|
|
|
/*
|
|
* auth_reset - called when LCP is starting negotiations to recheck
|
|
* authentication options, i.e. whether we have appropriate secrets
|
|
* to use for authenticating ourselves and/or the peer.
|
|
*/
|
|
void
|
|
auth_reset(int unit)
|
|
{
|
|
lcp_options *go = &lcp_gotoptions[unit];
|
|
lcp_options *ao = &lcp_allowoptions[0];
|
|
ipcp_options *ipwo = &ipcp_wantoptions[0];
|
|
u32_t remote;
|
|
|
|
AUTHDEBUG(LOG_INFO, ("auth_reset: %d\n", unit));
|
|
ao->neg_upap = !ppp_settings.refuse_pap && (ppp_settings.passwd[0] != 0 || get_pap_passwd(unit, NULL, NULL));
|
|
ao->neg_chap = !ppp_settings.refuse_chap && ppp_settings.passwd[0] != 0 /*have_chap_secret(ppp_settings.user, ppp_settings.remote_name, (u32_t)0)*/;
|
|
|
|
if (go->neg_upap && !have_pap_secret()) {
|
|
go->neg_upap = 0;
|
|
}
|
|
if (go->neg_chap) {
|
|
remote = ipwo->accept_remote? 0: ipwo->hisaddr;
|
|
if (!have_chap_secret(ppp_settings.remote_name, ppp_settings.our_name, remote)) {
|
|
go->neg_chap = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
#if PAP_SUPPORT
|
|
/*
|
|
* check_passwd - Check the user name and passwd against the PAP secrets
|
|
* file. If requested, also check against the system password database,
|
|
* and login the user if OK.
|
|
*
|
|
* returns:
|
|
* UPAP_AUTHNAK: Authentication failed.
|
|
* UPAP_AUTHACK: Authentication succeeded.
|
|
* In either case, msg points to an appropriate message.
|
|
*/
|
|
u_char
|
|
check_passwd( int unit, char *auser, int userlen, char *apasswd, int passwdlen, char **msg, int *msglen)
|
|
{
|
|
#if 1 /* XXX Assume all entries OK. */
|
|
LWIP_UNUSED_ARG(unit);
|
|
LWIP_UNUSED_ARG(auser);
|
|
LWIP_UNUSED_ARG(userlen);
|
|
LWIP_UNUSED_ARG(apasswd);
|
|
LWIP_UNUSED_ARG(passwdlen);
|
|
LWIP_UNUSED_ARG(msglen);
|
|
*msg = (char *) 0;
|
|
return UPAP_AUTHACK; /* XXX Assume all entries OK. */
|
|
#else
|
|
u_char ret = 0;
|
|
struct wordlist *addrs = NULL;
|
|
char passwd[256], user[256];
|
|
char secret[MAXWORDLEN];
|
|
static u_short attempts = 0;
|
|
|
|
/*
|
|
* Make copies of apasswd and auser, then null-terminate them.
|
|
*/
|
|
BCOPY(apasswd, passwd, passwdlen);
|
|
passwd[passwdlen] = '\0';
|
|
BCOPY(auser, user, userlen);
|
|
user[userlen] = '\0';
|
|
*msg = (char *) 0;
|
|
|
|
/* XXX Validate user name and password. */
|
|
ret = UPAP_AUTHACK; /* XXX Assume all entries OK. */
|
|
|
|
if (ret == UPAP_AUTHNAK) {
|
|
if (*msg == (char *) 0) {
|
|
*msg = "Login incorrect";
|
|
}
|
|
*msglen = strlen(*msg);
|
|
/*
|
|
* Frustrate passwd stealer programs.
|
|
* Allow 10 tries, but start backing off after 3 (stolen from login).
|
|
* On 10'th, drop the connection.
|
|
*/
|
|
if (attempts++ >= 10) {
|
|
AUTHDEBUG(LOG_WARNING, ("%d LOGIN FAILURES BY %s\n", attempts, user));
|
|
/*ppp_panic("Excess Bad Logins");*/
|
|
}
|
|
if (attempts > 3) {
|
|
/* @todo: this was sleep(), i.e. seconds, not milliseconds
|
|
* I don't think we really need this in lwIP - we would block tcpip_thread!
|
|
*/
|
|
/*sys_msleep((attempts - 3) * 5);*/
|
|
}
|
|
if (addrs != NULL) {
|
|
free_wordlist(addrs);
|
|
}
|
|
} else {
|
|
attempts = 0; /* Reset count */
|
|
if (*msg == (char *) 0) {
|
|
*msg = "Login ok";
|
|
}
|
|
*msglen = strlen(*msg);
|
|
set_allowed_addrs(unit, addrs);
|
|
}
|
|
|
|
BZERO(passwd, sizeof(passwd));
|
|
BZERO(secret, sizeof(secret));
|
|
|
|
return ret;
|
|
#endif
|
|
}
|
|
#endif /* PAP_SUPPORT */
|
|
|
|
#if 0 /* UNUSED */
|
|
/*
|
|
* This function is needed for PAM.
|
|
*/
|
|
|
|
#ifdef USE_PAM
|
|
|
|
/* lwip does not support PAM*/
|
|
|
|
#endif /* USE_PAM */
|
|
|
|
#endif /* UNUSED */
|
|
|
|
|
|
#if 0 /* UNUSED */
|
|
/*
|
|
* plogin - Check the user name and password against the system
|
|
* password database, and login the user if OK.
|
|
*
|
|
* returns:
|
|
* UPAP_AUTHNAK: Login failed.
|
|
* UPAP_AUTHACK: Login succeeded.
|
|
* In either case, msg points to an appropriate message.
|
|
*/
|
|
static int
|
|
plogin(char *user, char *passwd, char **msg, int *msglen)
|
|
{
|
|
|
|
LWIP_UNUSED_ARG(user);
|
|
LWIP_UNUSED_ARG(passwd);
|
|
LWIP_UNUSED_ARG(msg);
|
|
LWIP_UNUSED_ARG(msglen);
|
|
|
|
|
|
/* The new lines are here align the file when
|
|
* compared against the pppd 2.3.11 code */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* XXX Fail until we decide that we want to support logins. */
|
|
return (UPAP_AUTHNAK);
|
|
}
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
* plogout - Logout the user.
|
|
*/
|
|
static void
|
|
plogout(void)
|
|
{
|
|
logged_in = 0;
|
|
}
|
|
|
|
/*
|
|
* null_login - Check if a username of "" and a password of "" are
|
|
* acceptable, and iff so, set the list of acceptable IP addresses
|
|
* and return 1.
|
|
*/
|
|
static int
|
|
null_login(int unit)
|
|
{
|
|
LWIP_UNUSED_ARG(unit);
|
|
/* XXX Fail until we decide that we want to support logins. */
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* get_pap_passwd - get a password for authenticating ourselves with
|
|
* our peer using PAP. Returns 1 on success, 0 if no suitable password
|
|
* could be found.
|
|
*/
|
|
static int
|
|
get_pap_passwd(int unit, char *user, char *passwd)
|
|
{
|
|
LWIP_UNUSED_ARG(unit);
|
|
/* normally we would reject PAP if no password is provided,
|
|
but this causes problems with some providers (like CHT in Taiwan)
|
|
who incorrectly request PAP and expect a bogus/empty password, so
|
|
always provide a default user/passwd of "none"/"none"
|
|
|
|
@todo: This should be configured by the user, instead of being hardcoded here!
|
|
*/
|
|
if(user) {
|
|
strcpy(user, "none");
|
|
}
|
|
if(passwd) {
|
|
strcpy(passwd, "none");
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* have_pap_secret - check whether we have a PAP file with any
|
|
* secrets that we could possibly use for authenticating the peer.
|
|
*/
|
|
static int
|
|
have_pap_secret(void)
|
|
{
|
|
/* XXX Fail until we set up our passwords. */
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* have_chap_secret - check whether we have a CHAP file with a
|
|
* secret that we could possibly use for authenticating `client'
|
|
* on `server'. Either can be the null string, meaning we don't
|
|
* know the identity yet.
|
|
*/
|
|
static int
|
|
have_chap_secret(char *client, char *server, u32_t remote)
|
|
{
|
|
LWIP_UNUSED_ARG(client);
|
|
LWIP_UNUSED_ARG(server);
|
|
LWIP_UNUSED_ARG(remote);
|
|
|
|
/* XXX Fail until we set up our passwords. */
|
|
return 0;
|
|
}
|
|
#if CHAP_SUPPORT
|
|
|
|
/*
|
|
* get_secret - open the CHAP secret file and return the secret
|
|
* for authenticating the given client on the given server.
|
|
* (We could be either client or server).
|
|
*/
|
|
int
|
|
get_secret(int unit, char *client, char *server, char *secret, int *secret_len, int save_addrs)
|
|
{
|
|
#if 1
|
|
int len;
|
|
struct wordlist *addrs;
|
|
|
|
LWIP_UNUSED_ARG(unit);
|
|
LWIP_UNUSED_ARG(server);
|
|
LWIP_UNUSED_ARG(save_addrs);
|
|
|
|
addrs = NULL;
|
|
|
|
if(!client || !client[0] || strcmp(client, ppp_settings.user)) {
|
|
return 0;
|
|
}
|
|
|
|
len = (int)strlen(ppp_settings.passwd);
|
|
if (len > MAXSECRETLEN) {
|
|
AUTHDEBUG(LOG_ERR, ("Secret for %s on %s is too long\n", client, server));
|
|
len = MAXSECRETLEN;
|
|
}
|
|
|
|
BCOPY(ppp_settings.passwd, secret, len);
|
|
*secret_len = len;
|
|
|
|
return 1;
|
|
#else
|
|
int ret = 0, len;
|
|
struct wordlist *addrs;
|
|
char secbuf[MAXWORDLEN];
|
|
|
|
addrs = NULL;
|
|
secbuf[0] = 0;
|
|
|
|
/* XXX Find secret. */
|
|
if (ret < 0) {
|
|
return 0;
|
|
}
|
|
|
|
if (save_addrs) {
|
|
set_allowed_addrs(unit, addrs);
|
|
}
|
|
|
|
len = strlen(secbuf);
|
|
if (len > MAXSECRETLEN) {
|
|
AUTHDEBUG(LOG_ERR, ("Secret for %s on %s is too long\n", client, server));
|
|
len = MAXSECRETLEN;
|
|
}
|
|
|
|
BCOPY(secbuf, secret, len);
|
|
BZERO(secbuf, sizeof(secbuf));
|
|
*secret_len = len;
|
|
|
|
return 1;
|
|
#endif
|
|
}
|
|
#endif /* CHAP_SUPPORT */
|
|
|
|
|
|
#if 0 /* PAP_SUPPORT || CHAP_SUPPORT */
|
|
/*
|
|
* set_allowed_addrs() - set the list of allowed addresses.
|
|
*/
|
|
static void
|
|
set_allowed_addrs(int unit, struct wordlist *addrs)
|
|
{
|
|
if (addresses[unit] != NULL) {
|
|
free_wordlist(addresses[unit]);
|
|
}
|
|
addresses[unit] = addrs;
|
|
|
|
#if 0
|
|
/*
|
|
* If there's only one authorized address we might as well
|
|
* ask our peer for that one right away
|
|
*/
|
|
if (addrs != NULL && addrs->next == NULL) {
|
|
char *p = addrs->word;
|
|
struct ipcp_options *wo = &ipcp_wantoptions[unit];
|
|
u32_t a;
|
|
struct hostent *hp;
|
|
|
|
if (wo->hisaddr == 0 && *p != '!' && *p != '-' && strchr(p, '/') == NULL) {
|
|
hp = gethostbyname(p);
|
|
if (hp != NULL && hp->h_addrtype == AF_INET) {
|
|
a = *(u32_t *)hp->h_addr;
|
|
} else {
|
|
a = inet_addr(p);
|
|
}
|
|
if (a != (u32_t) -1) {
|
|
wo->hisaddr = a;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
#endif /* 0 */ /* PAP_SUPPORT || CHAP_SUPPORT */
|
|
|
|
/*
|
|
* auth_ip_addr - check whether the peer is authorized to use
|
|
* a given IP address. Returns 1 if authorized, 0 otherwise.
|
|
*/
|
|
int
|
|
auth_ip_addr(int unit, u32_t addr)
|
|
{
|
|
return ip_addr_check(addr, addresses[unit]);
|
|
}
|
|
|
|
static int /* @todo: integrate this funtion into auth_ip_addr()*/
|
|
ip_addr_check(u32_t addr, struct wordlist *addrs)
|
|
{
|
|
/* don't allow loopback or multicast address */
|
|
if (bad_ip_adrs(addr)) {
|
|
return 0;
|
|
}
|
|
|
|
if (addrs == NULL) {
|
|
return !ppp_settings.auth_required; /* no addresses authorized */
|
|
}
|
|
|
|
/* XXX All other addresses allowed. */
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* bad_ip_adrs - return 1 if the IP address is one we don't want
|
|
* to use, such as an address in the loopback net or a multicast address.
|
|
* addr is in network byte order.
|
|
*/
|
|
int
|
|
bad_ip_adrs(u32_t addr)
|
|
{
|
|
addr = ntohl(addr);
|
|
return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
|
|
|| IN_MULTICAST(addr) || IN_BADCLASS(addr);
|
|
}
|
|
|
|
#if 0 /* UNUSED */ /* PAP_SUPPORT || CHAP_SUPPORT */
|
|
/*
|
|
* some_ip_ok - check a wordlist to see if it authorizes any
|
|
* IP address(es).
|
|
*/
|
|
static int
|
|
some_ip_ok(struct wordlist *addrs)
|
|
{
|
|
for (; addrs != 0; addrs = addrs->next) {
|
|
if (addrs->word[0] == '-')
|
|
break;
|
|
if (addrs->word[0] != '!')
|
|
return 1; /* some IP address is allowed */
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* check_access - complain if a secret file has too-liberal permissions.
|
|
*/
|
|
static void
|
|
check_access(FILE *f, char *filename)
|
|
{
|
|
struct stat sbuf;
|
|
|
|
if (fstat(fileno(f), &sbuf) < 0) {
|
|
warn("cannot stat secret file %s: %m", filename);
|
|
} else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
|
|
warn("Warning - secret file %s has world and/or group access",
|
|
filename);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* scan_authfile - Scan an authorization file for a secret suitable
|
|
* for authenticating `client' on `server'. The return value is -1
|
|
* if no secret is found, otherwise >= 0. The return value has
|
|
* NONWILD_CLIENT set if the secret didn't have "*" for the client, and
|
|
* NONWILD_SERVER set if the secret didn't have "*" for the server.
|
|
* Any following words on the line up to a "--" (i.e. address authorization
|
|
* info) are placed in a wordlist and returned in *addrs. Any
|
|
* following words (extra options) are placed in a wordlist and
|
|
* returned in *opts.
|
|
* We assume secret is NULL or points to MAXWORDLEN bytes of space.
|
|
*/
|
|
static int
|
|
scan_authfile(FILE *f, char *client, char *server, char *secret, struct wordlist **addrs, struct wordlist **opts, char *filename)
|
|
{
|
|
/* We do not (currently) need this in lwip */
|
|
return 0; /* dummy */
|
|
}
|
|
/*
|
|
* free_wordlist - release memory allocated for a wordlist.
|
|
*/
|
|
static void
|
|
free_wordlist(struct wordlist *wp)
|
|
{
|
|
struct wordlist *next;
|
|
|
|
while (wp != NULL) {
|
|
next = wp->next;
|
|
free(wp);
|
|
wp = next;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* auth_script_done - called when the auth-up or auth-down script
|
|
* has finished.
|
|
*/
|
|
static void
|
|
auth_script_done(void *arg)
|
|
{
|
|
auth_script_pid = 0;
|
|
switch (auth_script_state) {
|
|
case s_up:
|
|
if (auth_state == s_down) {
|
|
auth_script_state = s_down;
|
|
auth_script(_PATH_AUTHDOWN);
|
|
}
|
|
break;
|
|
case s_down:
|
|
if (auth_state == s_up) {
|
|
auth_script_state = s_up;
|
|
auth_script(_PATH_AUTHUP);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* auth_script - execute a script with arguments
|
|
* interface-name peer-name real-user tty speed
|
|
*/
|
|
static void
|
|
auth_script(char *script)
|
|
{
|
|
char strspeed[32];
|
|
struct passwd *pw;
|
|
char struid[32];
|
|
char *user_name;
|
|
char *argv[8];
|
|
|
|
if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
|
|
user_name = pw->pw_name;
|
|
else {
|
|
slprintf(struid, sizeof(struid), "%d", getuid());
|
|
user_name = struid;
|
|
}
|
|
slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
|
|
|
|
argv[0] = script;
|
|
argv[1] = ifname;
|
|
argv[2] = peer_authname;
|
|
argv[3] = user_name;
|
|
argv[4] = devnam;
|
|
argv[5] = strspeed;
|
|
argv[6] = NULL;
|
|
|
|
auth_script_pid = run_program(script, argv, 0, auth_script_done, NULL);
|
|
}
|
|
#endif /* 0 */ /* PAP_SUPPORT || CHAP_SUPPORT */
|
|
#endif /* PPP_SUPPORT */
|