[457] | 1 | /*
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| 2 | * auth.c - PPP authentication and phase control.
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| 3 | *
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| 4 | * Copyright (c) 1993-2002 Paul Mackerras. All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | *
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| 13 | * 2. The name(s) of the authors of this software must not be used to
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| 14 | * endorse or promote products derived from this software without
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| 15 | * prior written permission.
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| 16 | *
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| 17 | * 3. Redistributions of any form whatsoever must retain the following
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| 18 | * acknowledgment:
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| 19 | * "This product includes software developed by Paul Mackerras
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| 20 | * <paulus@samba.org>".
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| 21 | *
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| 22 | * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
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| 23 | * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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| 24 | * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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| 25 | * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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| 26 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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| 27 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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| 28 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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| 29 | *
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| 30 | * Derived from main.c, which is:
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| 31 | *
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| 32 | * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
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| 33 | *
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| 34 | * Redistribution and use in source and binary forms, with or without
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| 35 | * modification, are permitted provided that the following conditions
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| 36 | * are met:
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| 37 | *
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| 38 | * 1. Redistributions of source code must retain the above copyright
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| 39 | * notice, this list of conditions and the following disclaimer.
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| 40 | *
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| 41 | * 2. Redistributions in binary form must reproduce the above copyright
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| 42 | * notice, this list of conditions and the following disclaimer in
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| 43 | * the documentation and/or other materials provided with the
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| 44 | * distribution.
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| 45 | *
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| 46 | * 3. The name "Carnegie Mellon University" must not be used to
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| 47 | * endorse or promote products derived from this software without
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| 48 | * prior written permission. For permission or any legal
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| 49 | * details, please contact
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| 50 | * Office of Technology Transfer
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| 51 | * Carnegie Mellon University
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| 52 | * 5000 Forbes Avenue
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| 53 | * Pittsburgh, PA 15213-3890
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| 54 | * (412) 268-4387, fax: (412) 268-7395
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| 55 | * tech-transfer@andrew.cmu.edu
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| 56 | *
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| 57 | * 4. Redistributions of any form whatsoever must retain the following
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| 58 | * acknowledgment:
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| 59 | * "This product includes software developed by Computing Services
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| 60 | * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
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| 61 | *
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| 62 | * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
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| 63 | * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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| 64 | * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
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| 65 | * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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| 66 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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| 67 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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| 68 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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| 69 | */
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| 70 |
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| 71 | #include "netif/ppp/ppp_opts.h"
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| 72 | #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
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| 73 |
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| 74 | #if 0 /* UNUSED */
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| 75 | #include <stdio.h>
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| 76 | #include <stddef.h>
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| 77 | #include <stdlib.h>
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| 78 | #include <unistd.h>
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| 79 | #include <errno.h>
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| 80 | #include <pwd.h>
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| 81 | #include <grp.h>
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| 82 | #include <string.h>
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| 83 | #include <sys/types.h>
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| 84 | #include <sys/stat.h>
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| 85 | #include <sys/socket.h>
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| 86 | #include <utmp.h>
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| 87 | #include <fcntl.h>
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| 88 | #if defined(_PATH_LASTLOG) && defined(__linux__)
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| 89 | #include <lastlog.h>
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| 90 | #endif
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| 91 |
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| 92 | #include <netdb.h>
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| 93 | #include <netinet/in.h>
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| 94 | #include <arpa/inet.h>
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| 95 |
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| 96 | #ifdef HAS_SHADOW
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| 97 | #include <shadow.h>
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| 98 | #ifndef PW_PPP
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| 99 | #define PW_PPP PW_LOGIN
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| 100 | #endif
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| 101 | #endif
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| 102 |
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| 103 | #include <time.h>
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| 104 | #endif /* UNUSED */
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| 105 |
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| 106 | #include "netif/ppp/ppp_impl.h"
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| 107 |
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| 108 | #include "netif/ppp/fsm.h"
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| 109 | #include "netif/ppp/lcp.h"
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| 110 | #if CCP_SUPPORT
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| 111 | #include "netif/ppp/ccp.h"
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| 112 | #endif /* CCP_SUPPORT */
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| 113 | #if ECP_SUPPORT
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| 114 | #include "netif/ppp/ecp.h"
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| 115 | #endif /* ECP_SUPPORT */
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| 116 | #include "netif/ppp/ipcp.h"
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| 117 | #if PAP_SUPPORT
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| 118 | #include "netif/ppp/upap.h"
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| 119 | #endif /* PAP_SUPPORT */
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| 120 | #if CHAP_SUPPORT
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| 121 | #include "netif/ppp/chap-new.h"
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| 122 | #endif /* CHAP_SUPPORT */
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| 123 | #if EAP_SUPPORT
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| 124 | #include "netif/ppp/eap.h"
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| 125 | #endif /* EAP_SUPPORT */
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| 126 | #if CBCP_SUPPORT
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| 127 | #include "netif/ppp/cbcp.h"
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| 128 | #endif
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| 129 |
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| 130 | #if 0 /* UNUSED */
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| 131 | #include "session.h"
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| 132 | #endif /* UNUSED */
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| 133 |
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| 134 | #if 0 /* UNUSED */
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| 135 | /* Bits in scan_authfile return value */
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| 136 | #define NONWILD_SERVER 1
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| 137 | #define NONWILD_CLIENT 2
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| 138 |
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| 139 | #define ISWILD(word) (word[0] == '*' && word[1] == 0)
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| 140 | #endif /* UNUSED */
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| 141 |
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| 142 | #if 0 /* UNUSED */
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| 143 | /* List of addresses which the peer may use. */
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| 144 | static struct permitted_ip *addresses[NUM_PPP];
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| 145 |
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| 146 | /* Wordlist giving addresses which the peer may use
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| 147 | without authenticating itself. */
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| 148 | static struct wordlist *noauth_addrs;
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| 149 |
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| 150 | /* Remote telephone number, if available */
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| 151 | char remote_number[MAXNAMELEN];
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| 152 |
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| 153 | /* Wordlist giving remote telephone numbers which may connect. */
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| 154 | static struct wordlist *permitted_numbers;
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| 155 |
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| 156 | /* Extra options to apply, from the secrets file entry for the peer. */
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| 157 | static struct wordlist *extra_options;
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| 158 | #endif /* UNUSED */
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| 159 |
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| 160 | #if 0 /* UNUSED */
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| 161 | /* Set if we require authentication only because we have a default route. */
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| 162 | static bool default_auth;
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| 163 |
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| 164 | /* Hook to enable a plugin to control the idle time limit */
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| 165 | int (*idle_time_hook) (struct ppp_idle *) = NULL;
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| 166 |
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| 167 | /* Hook for a plugin to say whether we can possibly authenticate any peer */
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| 168 | int (*pap_check_hook) (void) = NULL;
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| 169 |
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| 170 | /* Hook for a plugin to check the PAP user and password */
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| 171 | int (*pap_auth_hook) (char *user, char *passwd, char **msgp,
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| 172 | struct wordlist **paddrs,
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| 173 | struct wordlist **popts) = NULL;
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| 174 |
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| 175 | /* Hook for a plugin to know about the PAP user logout */
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| 176 | void (*pap_logout_hook) (void) = NULL;
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| 177 |
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| 178 | /* Hook for a plugin to get the PAP password for authenticating us */
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| 179 | int (*pap_passwd_hook) (char *user, char *passwd) = NULL;
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| 180 |
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| 181 | /* Hook for a plugin to say if we can possibly authenticate a peer using CHAP */
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| 182 | int (*chap_check_hook) (void) = NULL;
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| 183 |
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| 184 | /* Hook for a plugin to get the CHAP password for authenticating us */
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| 185 | int (*chap_passwd_hook) (char *user, char *passwd) = NULL;
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| 186 |
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| 187 | /* Hook for a plugin to say whether it is OK if the peer
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| 188 | refuses to authenticate. */
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| 189 | int (*null_auth_hook) (struct wordlist **paddrs,
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| 190 | struct wordlist **popts) = NULL;
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| 191 |
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| 192 | int (*allowed_address_hook) (u32_t addr) = NULL;
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| 193 | #endif /* UNUSED */
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| 194 |
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| 195 | #ifdef HAVE_MULTILINK
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| 196 | /* Hook for plugin to hear when an interface joins a multilink bundle */
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| 197 | void (*multilink_join_hook) (void) = NULL;
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| 198 | #endif
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| 199 |
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| 200 | #if PPP_NOTIFY
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| 201 | /* A notifier for when the peer has authenticated itself,
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| 202 | and we are proceeding to the network phase. */
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| 203 | struct notifier *auth_up_notifier = NULL;
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| 204 |
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| 205 | /* A notifier for when the link goes down. */
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| 206 | struct notifier *link_down_notifier = NULL;
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| 207 | #endif /* PPP_NOTIFY */
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| 208 |
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| 209 | /*
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| 210 | * Option variables.
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| 211 | */
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| 212 | #if 0 /* MOVED TO ppp_settings */
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| 213 | bool uselogin = 0; /* Use /etc/passwd for checking PAP */
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| 214 | bool session_mgmt = 0; /* Do session management (login records) */
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| 215 | bool cryptpap = 0; /* Passwords in pap-secrets are encrypted */
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| 216 | bool refuse_pap = 0; /* Don't wanna auth. ourselves with PAP */
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| 217 | bool refuse_chap = 0; /* Don't wanna auth. ourselves with CHAP */
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| 218 | bool refuse_eap = 0; /* Don't wanna auth. ourselves with EAP */
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| 219 | #if MSCHAP_SUPPORT
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| 220 | bool refuse_mschap = 0; /* Don't wanna auth. ourselves with MS-CHAP */
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| 221 | bool refuse_mschap_v2 = 0; /* Don't wanna auth. ourselves with MS-CHAPv2 */
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| 222 | #else /* MSCHAP_SUPPORT */
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| 223 | bool refuse_mschap = 1; /* Don't wanna auth. ourselves with MS-CHAP */
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| 224 | bool refuse_mschap_v2 = 1; /* Don't wanna auth. ourselves with MS-CHAPv2 */
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| 225 | #endif /* MSCHAP_SUPPORT */
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| 226 | bool usehostname = 0; /* Use hostname for our_name */
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| 227 | bool auth_required = 0; /* Always require authentication from peer */
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| 228 | bool allow_any_ip = 0; /* Allow peer to use any IP address */
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| 229 | bool explicit_remote = 0; /* User specified explicit remote name */
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| 230 | bool explicit_user = 0; /* Set if "user" option supplied */
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| 231 | bool explicit_passwd = 0; /* Set if "password" option supplied */
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| 232 | char remote_name[MAXNAMELEN]; /* Peer's name for authentication */
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| 233 | static char *uafname; /* name of most recent +ua file */
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| 234 |
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| 235 | extern char *crypt (const char *, const char *);
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| 236 | #endif /* UNUSED */
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| 237 | /* Prototypes for procedures local to this file. */
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| 238 |
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| 239 | static void network_phase(ppp_pcb *pcb);
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| 240 | #if PPP_IDLETIMELIMIT
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| 241 | static void check_idle(void *arg);
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| 242 | #endif /* PPP_IDLETIMELIMIT */
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| 243 | #if PPP_MAXCONNECT
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| 244 | static void connect_time_expired(void *arg);
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| 245 | #endif /* PPP_MAXCONNECT */
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| 246 | #if 0 /* UNUSED */
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| 247 | static int null_login (int);
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| 248 | /* static int get_pap_passwd (char *); */
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| 249 | static int have_pap_secret (int *);
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| 250 | static int have_chap_secret (char *, char *, int, int *);
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| 251 | static int have_srp_secret (char *client, char *server, int need_ip,
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| 252 | int *lacks_ipp);
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| 253 | static int ip_addr_check (u32_t, struct permitted_ip *);
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| 254 | static int scan_authfile (FILE *, char *, char *, char *,
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| 255 | struct wordlist **, struct wordlist **,
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| 256 | char *, int);
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| 257 | static void free_wordlist (struct wordlist *);
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| 258 | static void set_allowed_addrs (int, struct wordlist *, struct wordlist *);
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| 259 | static int some_ip_ok (struct wordlist *);
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| 260 | static int setupapfile (char **);
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| 261 | static int privgroup (char **);
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| 262 | static int set_noauth_addr (char **);
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| 263 | static int set_permitted_number (char **);
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| 264 | static void check_access (FILE *, char *);
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| 265 | static int wordlist_count (struct wordlist *);
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| 266 | #endif /* UNUSED */
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| 267 |
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| 268 | #ifdef MAXOCTETS
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| 269 | static void check_maxoctets (void *);
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| 270 | #endif
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| 271 |
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| 272 | #if PPP_OPTIONS
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| 273 | /*
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| 274 | * Authentication-related options.
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| 275 | */
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| 276 | option_t auth_options[] = {
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| 277 | { "auth", o_bool, &auth_required,
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| 278 | "Require authentication from peer", OPT_PRIO | 1 },
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| 279 | { "noauth", o_bool, &auth_required,
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| 280 | "Don't require peer to authenticate", OPT_PRIOSUB | OPT_PRIV,
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| 281 | &allow_any_ip },
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| 282 | { "require-pap", o_bool, &lcp_wantoptions[0].neg_upap,
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| 283 | "Require PAP authentication from peer",
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| 284 | OPT_PRIOSUB | 1, &auth_required },
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| 285 | { "+pap", o_bool, &lcp_wantoptions[0].neg_upap,
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| 286 | "Require PAP authentication from peer",
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| 287 | OPT_ALIAS | OPT_PRIOSUB | 1, &auth_required },
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| 288 | { "require-chap", o_bool, &auth_required,
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| 289 | "Require CHAP authentication from peer",
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| 290 | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
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| 291 | &lcp_wantoptions[0].chap_mdtype },
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| 292 | { "+chap", o_bool, &auth_required,
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| 293 | "Require CHAP authentication from peer",
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| 294 | OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
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| 295 | &lcp_wantoptions[0].chap_mdtype },
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| 296 | #if MSCHAP_SUPPORT
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| 297 | { "require-mschap", o_bool, &auth_required,
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| 298 | "Require MS-CHAP authentication from peer",
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| 299 | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
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| 300 | &lcp_wantoptions[0].chap_mdtype },
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| 301 | { "+mschap", o_bool, &auth_required,
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| 302 | "Require MS-CHAP authentication from peer",
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| 303 | OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
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| 304 | &lcp_wantoptions[0].chap_mdtype },
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| 305 | { "require-mschap-v2", o_bool, &auth_required,
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| 306 | "Require MS-CHAPv2 authentication from peer",
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| 307 | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
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| 308 | &lcp_wantoptions[0].chap_mdtype },
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| 309 | { "+mschap-v2", o_bool, &auth_required,
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| 310 | "Require MS-CHAPv2 authentication from peer",
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| 311 | OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
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| 312 | &lcp_wantoptions[0].chap_mdtype },
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| 313 | #endif /* MSCHAP_SUPPORT */
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| 314 | #if 0
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| 315 | { "refuse-pap", o_bool, &refuse_pap,
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| 316 | "Don't agree to auth to peer with PAP", 1 },
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| 317 | { "-pap", o_bool, &refuse_pap,
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| 318 | "Don't allow PAP authentication with peer", OPT_ALIAS | 1 },
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| 319 | { "refuse-chap", o_bool, &refuse_chap,
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| 320 | "Don't agree to auth to peer with CHAP",
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| 321 | OPT_A2CLRB | MDTYPE_MD5,
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| 322 | &lcp_allowoptions[0].chap_mdtype },
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| 323 | { "-chap", o_bool, &refuse_chap,
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| 324 | "Don't allow CHAP authentication with peer",
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| 325 | OPT_ALIAS | OPT_A2CLRB | MDTYPE_MD5,
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| 326 | &lcp_allowoptions[0].chap_mdtype },
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| 327 | #endif
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| 328 | #if MSCHAP_SUPPORT
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| 329 | #if 0
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| 330 | { "refuse-mschap", o_bool, &refuse_mschap,
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| 331 | "Don't agree to auth to peer with MS-CHAP",
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| 332 | OPT_A2CLRB | MDTYPE_MICROSOFT,
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| 333 | &lcp_allowoptions[0].chap_mdtype },
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| 334 | { "-mschap", o_bool, &refuse_mschap,
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| 335 | "Don't allow MS-CHAP authentication with peer",
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| 336 | OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT,
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| 337 | &lcp_allowoptions[0].chap_mdtype },
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| 338 | { "refuse-mschap-v2", o_bool, &refuse_mschap_v2,
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| 339 | "Don't agree to auth to peer with MS-CHAPv2",
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| 340 | OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
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| 341 | &lcp_allowoptions[0].chap_mdtype },
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| 342 | { "-mschap-v2", o_bool, &refuse_mschap_v2,
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| 343 | "Don't allow MS-CHAPv2 authentication with peer",
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| 344 | OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
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| 345 | &lcp_allowoptions[0].chap_mdtype },
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| 346 | #endif
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| 347 | #endif /* MSCHAP_SUPPORT*/
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| 348 | #if EAP_SUPPORT
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| 349 | { "require-eap", o_bool, &lcp_wantoptions[0].neg_eap,
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| 350 | "Require EAP authentication from peer", OPT_PRIOSUB | 1,
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| 351 | &auth_required },
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| 352 | #if 0
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| 353 | { "refuse-eap", o_bool, &refuse_eap,
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| 354 | "Don't agree to authenticate to peer with EAP", 1 },
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| 355 | #endif
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| 356 | #endif /* EAP_SUPPORT */
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| 357 | { "name", o_string, our_name,
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| 358 | "Set local name for authentication",
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| 359 | OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXNAMELEN },
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| 360 |
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| 361 | { "+ua", o_special, (void *)setupapfile,
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| 362 | "Get PAP user and password from file",
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| 363 | OPT_PRIO | OPT_A2STRVAL, &uafname },
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| 364 |
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| 365 | #if 0
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| 366 | { "user", o_string, user,
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| 367 | "Set name for auth with peer", OPT_PRIO | OPT_STATIC,
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| 368 | &explicit_user, MAXNAMELEN },
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| 369 |
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| 370 | { "password", o_string, passwd,
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| 371 | "Password for authenticating us to the peer",
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| 372 | OPT_PRIO | OPT_STATIC | OPT_HIDE,
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| 373 | &explicit_passwd, MAXSECRETLEN },
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| 374 | #endif
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| 375 |
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| 376 | { "usehostname", o_bool, &usehostname,
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| 377 | "Must use hostname for authentication", 1 },
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| 378 |
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| 379 | { "remotename", o_string, remote_name,
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| 380 | "Set remote name for authentication", OPT_PRIO | OPT_STATIC,
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| 381 | &explicit_remote, MAXNAMELEN },
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| 382 |
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| 383 | { "login", o_bool, &uselogin,
|
---|
| 384 | "Use system password database for PAP", OPT_A2COPY | 1 ,
|
---|
| 385 | &session_mgmt },
|
---|
| 386 | { "enable-session", o_bool, &session_mgmt,
|
---|
| 387 | "Enable session accounting for remote peers", OPT_PRIV | 1 },
|
---|
| 388 |
|
---|
| 389 | { "papcrypt", o_bool, &cryptpap,
|
---|
| 390 | "PAP passwords are encrypted", 1 },
|
---|
| 391 |
|
---|
| 392 | { "privgroup", o_special, (void *)privgroup,
|
---|
| 393 | "Allow group members to use privileged options", OPT_PRIV | OPT_A2LIST },
|
---|
| 394 |
|
---|
| 395 | { "allow-ip", o_special, (void *)set_noauth_addr,
|
---|
| 396 | "Set IP address(es) which can be used without authentication",
|
---|
| 397 | OPT_PRIV | OPT_A2LIST },
|
---|
| 398 |
|
---|
| 399 | { "remotenumber", o_string, remote_number,
|
---|
| 400 | "Set remote telephone number for authentication", OPT_PRIO | OPT_STATIC,
|
---|
| 401 | NULL, MAXNAMELEN },
|
---|
| 402 |
|
---|
| 403 | { "allow-number", o_special, (void *)set_permitted_number,
|
---|
| 404 | "Set telephone number(s) which are allowed to connect",
|
---|
| 405 | OPT_PRIV | OPT_A2LIST },
|
---|
| 406 |
|
---|
| 407 | { NULL }
|
---|
| 408 | };
|
---|
| 409 | #endif /* PPP_OPTIONS */
|
---|
| 410 |
|
---|
| 411 | #if 0 /* UNUSED */
|
---|
| 412 | /*
|
---|
| 413 | * setupapfile - specifies UPAP info for authenticating with peer.
|
---|
| 414 | */
|
---|
| 415 | static int
|
---|
| 416 | setupapfile(argv)
|
---|
| 417 | char **argv;
|
---|
| 418 | {
|
---|
| 419 | FILE *ufile;
|
---|
| 420 | int l;
|
---|
| 421 | uid_t euid;
|
---|
| 422 | char u[MAXNAMELEN], p[MAXSECRETLEN];
|
---|
| 423 | char *fname;
|
---|
| 424 |
|
---|
| 425 | lcp_allowoptions[0].neg_upap = 1;
|
---|
| 426 |
|
---|
| 427 | /* open user info file */
|
---|
| 428 | fname = strdup(*argv);
|
---|
| 429 | if (fname == NULL)
|
---|
| 430 | novm("+ua file name");
|
---|
| 431 | euid = geteuid();
|
---|
| 432 | if (seteuid(getuid()) == -1) {
|
---|
| 433 | option_error("unable to reset uid before opening %s: %m", fname);
|
---|
| 434 | return 0;
|
---|
| 435 | }
|
---|
| 436 | ufile = fopen(fname, "r");
|
---|
| 437 | if (seteuid(euid) == -1)
|
---|
| 438 | fatal("unable to regain privileges: %m");
|
---|
| 439 | if (ufile == NULL) {
|
---|
| 440 | option_error("unable to open user login data file %s", fname);
|
---|
| 441 | return 0;
|
---|
| 442 | }
|
---|
| 443 | check_access(ufile, fname);
|
---|
| 444 | uafname = fname;
|
---|
| 445 |
|
---|
| 446 | /* get username */
|
---|
| 447 | if (fgets(u, MAXNAMELEN - 1, ufile) == NULL
|
---|
| 448 | || fgets(p, MAXSECRETLEN - 1, ufile) == NULL) {
|
---|
| 449 | fclose(ufile);
|
---|
| 450 | option_error("unable to read user login data file %s", fname);
|
---|
| 451 | return 0;
|
---|
| 452 | }
|
---|
| 453 | fclose(ufile);
|
---|
| 454 |
|
---|
| 455 | /* get rid of newlines */
|
---|
| 456 | l = strlen(u);
|
---|
| 457 | if (l > 0 && u[l-1] == '\n')
|
---|
| 458 | u[l-1] = 0;
|
---|
| 459 | l = strlen(p);
|
---|
| 460 | if (l > 0 && p[l-1] == '\n')
|
---|
| 461 | p[l-1] = 0;
|
---|
| 462 |
|
---|
| 463 | if (override_value("user", option_priority, fname)) {
|
---|
| 464 | strlcpy(ppp_settings.user, u, sizeof(ppp_settings.user));
|
---|
| 465 | explicit_user = 1;
|
---|
| 466 | }
|
---|
| 467 | if (override_value("passwd", option_priority, fname)) {
|
---|
| 468 | strlcpy(ppp_settings.passwd, p, sizeof(ppp_settings.passwd));
|
---|
| 469 | explicit_passwd = 1;
|
---|
| 470 | }
|
---|
| 471 |
|
---|
| 472 | return (1);
|
---|
| 473 | }
|
---|
| 474 |
|
---|
| 475 | /*
|
---|
| 476 | * privgroup - allow members of the group to have privileged access.
|
---|
| 477 | */
|
---|
| 478 | static int
|
---|
| 479 | privgroup(argv)
|
---|
| 480 | char **argv;
|
---|
| 481 | {
|
---|
| 482 | struct group *g;
|
---|
| 483 | int i;
|
---|
| 484 |
|
---|
| 485 | g = getgrnam(*argv);
|
---|
| 486 | if (g == 0) {
|
---|
| 487 | option_error("group %s is unknown", *argv);
|
---|
| 488 | return 0;
|
---|
| 489 | }
|
---|
| 490 | for (i = 0; i < ngroups; ++i) {
|
---|
| 491 | if (groups[i] == g->gr_gid) {
|
---|
| 492 | privileged = 1;
|
---|
| 493 | break;
|
---|
| 494 | }
|
---|
| 495 | }
|
---|
| 496 | return 1;
|
---|
| 497 | }
|
---|
| 498 |
|
---|
| 499 |
|
---|
| 500 | /*
|
---|
| 501 | * set_noauth_addr - set address(es) that can be used without authentication.
|
---|
| 502 | * Equivalent to specifying an entry like `"" * "" addr' in pap-secrets.
|
---|
| 503 | */
|
---|
| 504 | static int
|
---|
| 505 | set_noauth_addr(argv)
|
---|
| 506 | char **argv;
|
---|
| 507 | {
|
---|
| 508 | char *addr = *argv;
|
---|
| 509 | int l = strlen(addr) + 1;
|
---|
| 510 | struct wordlist *wp;
|
---|
| 511 |
|
---|
| 512 | wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
|
---|
| 513 | if (wp == NULL)
|
---|
| 514 | novm("allow-ip argument");
|
---|
| 515 | wp->word = (char *) (wp + 1);
|
---|
| 516 | wp->next = noauth_addrs;
|
---|
| 517 | MEMCPY(wp->word, addr, l);
|
---|
| 518 | noauth_addrs = wp;
|
---|
| 519 | return 1;
|
---|
| 520 | }
|
---|
| 521 |
|
---|
| 522 |
|
---|
| 523 | /*
|
---|
| 524 | * set_permitted_number - set remote telephone number(s) that may connect.
|
---|
| 525 | */
|
---|
| 526 | static int
|
---|
| 527 | set_permitted_number(argv)
|
---|
| 528 | char **argv;
|
---|
| 529 | {
|
---|
| 530 | char *number = *argv;
|
---|
| 531 | int l = strlen(number) + 1;
|
---|
| 532 | struct wordlist *wp;
|
---|
| 533 |
|
---|
| 534 | wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
|
---|
| 535 | if (wp == NULL)
|
---|
| 536 | novm("allow-number argument");
|
---|
| 537 | wp->word = (char *) (wp + 1);
|
---|
| 538 | wp->next = permitted_numbers;
|
---|
| 539 | MEMCPY(wp->word, number, l);
|
---|
| 540 | permitted_numbers = wp;
|
---|
| 541 | return 1;
|
---|
| 542 | }
|
---|
| 543 | #endif
|
---|
| 544 |
|
---|
| 545 | /*
|
---|
| 546 | * An Open on LCP has requested a change from Dead to Establish phase.
|
---|
| 547 | */
|
---|
| 548 | void link_required(ppp_pcb *pcb) {
|
---|
| 549 | LWIP_UNUSED_ARG(pcb);
|
---|
| 550 | }
|
---|
| 551 |
|
---|
| 552 | #if 0
|
---|
| 553 | /*
|
---|
| 554 | * Bring the link up to the point of being able to do ppp.
|
---|
| 555 | */
|
---|
| 556 | void start_link(unit)
|
---|
| 557 | int unit;
|
---|
| 558 | {
|
---|
| 559 | ppp_pcb *pcb = &ppp_pcb_list[unit];
|
---|
| 560 | char *msg;
|
---|
| 561 |
|
---|
| 562 | status = EXIT_NEGOTIATION_FAILED;
|
---|
| 563 | new_phase(pcb, PPP_PHASE_SERIALCONN);
|
---|
| 564 |
|
---|
| 565 | hungup = 0;
|
---|
| 566 | devfd = the_channel->connect();
|
---|
| 567 | msg = "Connect script failed";
|
---|
| 568 | if (devfd < 0)
|
---|
| 569 | goto fail;
|
---|
| 570 |
|
---|
| 571 | /* set up the serial device as a ppp interface */
|
---|
| 572 | /*
|
---|
| 573 | * N.B. we used to do tdb_writelock/tdb_writeunlock around this
|
---|
| 574 | * (from establish_ppp to set_ifunit). However, we won't be
|
---|
| 575 | * doing the set_ifunit in multilink mode, which is the only time
|
---|
| 576 | * we need the atomicity that the tdb_writelock/tdb_writeunlock
|
---|
| 577 | * gives us. Thus we don't need the tdb_writelock/tdb_writeunlock.
|
---|
| 578 | */
|
---|
| 579 | fd_ppp = the_channel->establish_ppp(devfd);
|
---|
| 580 | msg = "ppp establishment failed";
|
---|
| 581 | if (fd_ppp < 0) {
|
---|
| 582 | status = EXIT_FATAL_ERROR;
|
---|
| 583 | goto disconnect;
|
---|
| 584 | }
|
---|
| 585 |
|
---|
| 586 | if (!demand && ifunit >= 0)
|
---|
| 587 | set_ifunit(1);
|
---|
| 588 |
|
---|
| 589 | /*
|
---|
| 590 | * Start opening the connection and wait for
|
---|
| 591 | * incoming events (reply, timeout, etc.).
|
---|
| 592 | */
|
---|
| 593 | if (ifunit >= 0)
|
---|
| 594 | ppp_notice("Connect: %s <--> %s", ifname, ppp_devnam);
|
---|
| 595 | else
|
---|
| 596 | ppp_notice("Starting negotiation on %s", ppp_devnam);
|
---|
| 597 | add_fd(fd_ppp);
|
---|
| 598 |
|
---|
| 599 | new_phase(pcb, PPP_PHASE_ESTABLISH);
|
---|
| 600 |
|
---|
| 601 | lcp_lowerup(pcb);
|
---|
| 602 | return;
|
---|
| 603 |
|
---|
| 604 | disconnect:
|
---|
| 605 | new_phase(pcb, PPP_PHASE_DISCONNECT);
|
---|
| 606 | if (the_channel->disconnect)
|
---|
| 607 | the_channel->disconnect();
|
---|
| 608 |
|
---|
| 609 | fail:
|
---|
| 610 | new_phase(pcb, PPP_PHASE_DEAD);
|
---|
| 611 | if (the_channel->cleanup)
|
---|
| 612 | (*the_channel->cleanup)();
|
---|
| 613 | }
|
---|
| 614 | #endif
|
---|
| 615 |
|
---|
| 616 | /*
|
---|
| 617 | * LCP has terminated the link; go to the Dead phase and take the
|
---|
| 618 | * physical layer down.
|
---|
| 619 | */
|
---|
| 620 | void link_terminated(ppp_pcb *pcb) {
|
---|
| 621 | if (pcb->phase == PPP_PHASE_DEAD
|
---|
| 622 | #ifdef HAVE_MULTILINK
|
---|
| 623 | || pcb->phase == PPP_PHASE_MASTER
|
---|
| 624 | #endif /* HAVE_MULTILINK */
|
---|
| 625 | )
|
---|
| 626 | return;
|
---|
| 627 | new_phase(pcb, PPP_PHASE_DISCONNECT);
|
---|
| 628 |
|
---|
| 629 | #if 0 /* UNUSED */
|
---|
| 630 | if (pap_logout_hook) {
|
---|
| 631 | pap_logout_hook();
|
---|
| 632 | }
|
---|
| 633 | session_end(devnam);
|
---|
| 634 | #endif /* UNUSED */
|
---|
| 635 |
|
---|
| 636 | if (!doing_multilink) {
|
---|
| 637 | ppp_notice("Connection terminated.");
|
---|
| 638 | #if PPP_STATS_SUPPORT
|
---|
| 639 | print_link_stats();
|
---|
| 640 | #endif /* PPP_STATS_SUPPORT */
|
---|
| 641 | } else
|
---|
| 642 | ppp_notice("Link terminated.");
|
---|
| 643 |
|
---|
| 644 | lcp_lowerdown(pcb);
|
---|
| 645 |
|
---|
| 646 | ppp_link_terminated(pcb);
|
---|
| 647 | #if 0
|
---|
| 648 | /*
|
---|
| 649 | * Delete pid files before disestablishing ppp. Otherwise it
|
---|
| 650 | * can happen that another pppd gets the same unit and then
|
---|
| 651 | * we delete its pid file.
|
---|
| 652 | */
|
---|
| 653 | if (!doing_multilink && !demand)
|
---|
| 654 | remove_pidfiles();
|
---|
| 655 |
|
---|
| 656 | /*
|
---|
| 657 | * If we may want to bring the link up again, transfer
|
---|
| 658 | * the ppp unit back to the loopback. Set the
|
---|
| 659 | * real serial device back to its normal mode of operation.
|
---|
| 660 | */
|
---|
| 661 | if (fd_ppp >= 0) {
|
---|
| 662 | remove_fd(fd_ppp);
|
---|
| 663 | clean_check();
|
---|
| 664 | the_channel->disestablish_ppp(devfd);
|
---|
| 665 | if (doing_multilink)
|
---|
| 666 | mp_exit_bundle();
|
---|
| 667 | fd_ppp = -1;
|
---|
| 668 | }
|
---|
| 669 | if (!hungup)
|
---|
| 670 | lcp_lowerdown(pcb);
|
---|
| 671 | if (!doing_multilink && !demand)
|
---|
| 672 | script_unsetenv("IFNAME");
|
---|
| 673 |
|
---|
| 674 | /*
|
---|
| 675 | * Run disconnector script, if requested.
|
---|
| 676 | * XXX we may not be able to do this if the line has hung up!
|
---|
| 677 | */
|
---|
| 678 | if (devfd >= 0 && the_channel->disconnect) {
|
---|
| 679 | the_channel->disconnect();
|
---|
| 680 | devfd = -1;
|
---|
| 681 | }
|
---|
| 682 | if (the_channel->cleanup)
|
---|
| 683 | (*the_channel->cleanup)();
|
---|
| 684 |
|
---|
| 685 | if (doing_multilink && multilink_master) {
|
---|
| 686 | if (!bundle_terminating)
|
---|
| 687 | new_phase(pcb, PPP_PHASE_MASTER);
|
---|
| 688 | else
|
---|
| 689 | mp_bundle_terminated();
|
---|
| 690 | } else
|
---|
| 691 | new_phase(pcb, PPP_PHASE_DEAD);
|
---|
| 692 | #endif
|
---|
| 693 | }
|
---|
| 694 |
|
---|
| 695 | /*
|
---|
| 696 | * LCP has gone down; it will either die or try to re-establish.
|
---|
| 697 | */
|
---|
| 698 | void link_down(ppp_pcb *pcb) {
|
---|
| 699 | #if PPP_NOTIFY
|
---|
| 700 | notify(link_down_notifier, 0);
|
---|
| 701 | #endif /* PPP_NOTIFY */
|
---|
| 702 |
|
---|
| 703 | if (!doing_multilink) {
|
---|
| 704 | upper_layers_down(pcb);
|
---|
| 705 | if (pcb->phase != PPP_PHASE_DEAD
|
---|
| 706 | #ifdef HAVE_MULTILINK
|
---|
| 707 | && pcb->phase != PPP_PHASE_MASTER
|
---|
| 708 | #endif /* HAVE_MULTILINK */
|
---|
| 709 | )
|
---|
| 710 | new_phase(pcb, PPP_PHASE_ESTABLISH);
|
---|
| 711 | }
|
---|
| 712 | /* XXX if doing_multilink, should do something to stop
|
---|
| 713 | network-layer traffic on the link */
|
---|
| 714 | }
|
---|
| 715 |
|
---|
| 716 | void upper_layers_down(ppp_pcb *pcb) {
|
---|
| 717 | int i;
|
---|
| 718 | const struct protent *protp;
|
---|
| 719 |
|
---|
| 720 | for (i = 0; (protp = protocols[i]) != NULL; ++i) {
|
---|
| 721 | if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
|
---|
| 722 | (*protp->lowerdown)(pcb);
|
---|
| 723 | if (protp->protocol < 0xC000 && protp->close != NULL)
|
---|
| 724 | (*protp->close)(pcb, "LCP down");
|
---|
| 725 | }
|
---|
| 726 | pcb->num_np_open = 0;
|
---|
| 727 | pcb->num_np_up = 0;
|
---|
| 728 | }
|
---|
| 729 |
|
---|
| 730 | /*
|
---|
| 731 | * The link is established.
|
---|
| 732 | * Proceed to the Dead, Authenticate or Network phase as appropriate.
|
---|
| 733 | */
|
---|
| 734 | void link_established(ppp_pcb *pcb) {
|
---|
| 735 | #if PPP_AUTH_SUPPORT
|
---|
| 736 | int auth;
|
---|
| 737 | #if PPP_SERVER
|
---|
| 738 | #if PAP_SUPPORT
|
---|
| 739 | lcp_options *wo = &pcb->lcp_wantoptions;
|
---|
| 740 | #endif /* PAP_SUPPORT */
|
---|
| 741 | lcp_options *go = &pcb->lcp_gotoptions;
|
---|
| 742 | #endif /* PPP_SERVER */
|
---|
| 743 | lcp_options *ho = &pcb->lcp_hisoptions;
|
---|
| 744 | #endif /* PPP_AUTH_SUPPORT */
|
---|
| 745 | int i;
|
---|
| 746 | const struct protent *protp;
|
---|
| 747 |
|
---|
| 748 | /*
|
---|
| 749 | * Tell higher-level protocols that LCP is up.
|
---|
| 750 | */
|
---|
| 751 | if (!doing_multilink) {
|
---|
| 752 | for (i = 0; (protp = protocols[i]) != NULL; ++i)
|
---|
| 753 | if (protp->protocol != PPP_LCP
|
---|
| 754 | && protp->lowerup != NULL)
|
---|
| 755 | (*protp->lowerup)(pcb);
|
---|
| 756 | }
|
---|
| 757 |
|
---|
| 758 | #if PPP_AUTH_SUPPORT
|
---|
| 759 | #if PPP_SERVER
|
---|
| 760 | #if PPP_ALLOWED_ADDRS
|
---|
| 761 | if (!auth_required && noauth_addrs != NULL)
|
---|
| 762 | set_allowed_addrs(unit, NULL, NULL);
|
---|
| 763 | #endif /* PPP_ALLOWED_ADDRS */
|
---|
| 764 |
|
---|
| 765 | if (pcb->settings.auth_required && !(0
|
---|
| 766 | #if PAP_SUPPORT
|
---|
| 767 | || go->neg_upap
|
---|
| 768 | #endif /* PAP_SUPPORT */
|
---|
| 769 | #if CHAP_SUPPORT
|
---|
| 770 | || go->neg_chap
|
---|
| 771 | #endif /* CHAP_SUPPORT */
|
---|
| 772 | #if EAP_SUPPORT
|
---|
| 773 | || go->neg_eap
|
---|
| 774 | #endif /* EAP_SUPPORT */
|
---|
| 775 | )) {
|
---|
| 776 |
|
---|
| 777 | #if PPP_ALLOWED_ADDRS
|
---|
| 778 | /*
|
---|
| 779 | * We wanted the peer to authenticate itself, and it refused:
|
---|
| 780 | * if we have some address(es) it can use without auth, fine,
|
---|
| 781 | * otherwise treat it as though it authenticated with PAP using
|
---|
| 782 | * a username of "" and a password of "". If that's not OK,
|
---|
| 783 | * boot it out.
|
---|
| 784 | */
|
---|
| 785 | if (noauth_addrs != NULL) {
|
---|
| 786 | set_allowed_addrs(unit, NULL, NULL);
|
---|
| 787 | } else
|
---|
| 788 | #endif /* PPP_ALLOWED_ADDRS */
|
---|
| 789 | if (!pcb->settings.null_login
|
---|
| 790 | #if PAP_SUPPORT
|
---|
| 791 | || !wo->neg_upap
|
---|
| 792 | #endif /* PAP_SUPPORT */
|
---|
| 793 | ) {
|
---|
| 794 | ppp_warn("peer refused to authenticate: terminating link");
|
---|
| 795 | #if 0 /* UNUSED */
|
---|
| 796 | status = EXIT_PEER_AUTH_FAILED;
|
---|
| 797 | #endif /* UNUSED */
|
---|
| 798 | pcb->err_code = PPPERR_AUTHFAIL;
|
---|
| 799 | lcp_close(pcb, "peer refused to authenticate");
|
---|
| 800 | return;
|
---|
| 801 | }
|
---|
| 802 | }
|
---|
| 803 | #endif /* PPP_SERVER */
|
---|
| 804 |
|
---|
| 805 | new_phase(pcb, PPP_PHASE_AUTHENTICATE);
|
---|
| 806 | auth = 0;
|
---|
| 807 | #if PPP_SERVER
|
---|
| 808 | #if EAP_SUPPORT
|
---|
| 809 | if (go->neg_eap) {
|
---|
| 810 | eap_authpeer(pcb, PPP_OUR_NAME);
|
---|
| 811 | auth |= EAP_PEER;
|
---|
| 812 | } else
|
---|
| 813 | #endif /* EAP_SUPPORT */
|
---|
| 814 | #if CHAP_SUPPORT
|
---|
| 815 | if (go->neg_chap) {
|
---|
| 816 | chap_auth_peer(pcb, PPP_OUR_NAME, CHAP_DIGEST(go->chap_mdtype));
|
---|
| 817 | auth |= CHAP_PEER;
|
---|
| 818 | } else
|
---|
| 819 | #endif /* CHAP_SUPPORT */
|
---|
| 820 | #if PAP_SUPPORT
|
---|
| 821 | if (go->neg_upap) {
|
---|
| 822 | upap_authpeer(pcb);
|
---|
| 823 | auth |= PAP_PEER;
|
---|
| 824 | } else
|
---|
| 825 | #endif /* PAP_SUPPORT */
|
---|
| 826 | {}
|
---|
| 827 | #endif /* PPP_SERVER */
|
---|
| 828 |
|
---|
| 829 | #if EAP_SUPPORT
|
---|
| 830 | if (ho->neg_eap) {
|
---|
| 831 | eap_authwithpeer(pcb, pcb->settings.user);
|
---|
| 832 | auth |= EAP_WITHPEER;
|
---|
| 833 | } else
|
---|
| 834 | #endif /* EAP_SUPPORT */
|
---|
| 835 | #if CHAP_SUPPORT
|
---|
| 836 | if (ho->neg_chap) {
|
---|
| 837 | chap_auth_with_peer(pcb, pcb->settings.user, CHAP_DIGEST(ho->chap_mdtype));
|
---|
| 838 | auth |= CHAP_WITHPEER;
|
---|
| 839 | } else
|
---|
| 840 | #endif /* CHAP_SUPPORT */
|
---|
| 841 | #if PAP_SUPPORT
|
---|
| 842 | if (ho->neg_upap) {
|
---|
| 843 | upap_authwithpeer(pcb, pcb->settings.user, pcb->settings.passwd);
|
---|
| 844 | auth |= PAP_WITHPEER;
|
---|
| 845 | } else
|
---|
| 846 | #endif /* PAP_SUPPORT */
|
---|
| 847 | {}
|
---|
| 848 |
|
---|
| 849 | pcb->auth_pending = auth;
|
---|
| 850 | pcb->auth_done = 0;
|
---|
| 851 |
|
---|
| 852 | if (!auth)
|
---|
| 853 | #endif /* PPP_AUTH_SUPPORT */
|
---|
| 854 | network_phase(pcb);
|
---|
| 855 | }
|
---|
| 856 |
|
---|
| 857 | /*
|
---|
| 858 | * Proceed to the network phase.
|
---|
| 859 | */
|
---|
| 860 | static void network_phase(ppp_pcb *pcb) {
|
---|
| 861 | #if CBCP_SUPPORT
|
---|
| 862 | ppp_pcb *pcb = &ppp_pcb_list[unit];
|
---|
| 863 | #endif
|
---|
| 864 | #if 0 /* UNUSED */
|
---|
| 865 | lcp_options *go = &lcp_gotoptions[unit];
|
---|
| 866 | #endif /* UNUSED */
|
---|
| 867 |
|
---|
| 868 | #if 0 /* UNUSED */
|
---|
| 869 | /* Log calling number. */
|
---|
| 870 | if (*remote_number)
|
---|
| 871 | ppp_notice("peer from calling number %q authorized", remote_number);
|
---|
| 872 | #endif /* UNUSED */
|
---|
| 873 |
|
---|
| 874 | #if PPP_NOTIFY
|
---|
| 875 | /*
|
---|
| 876 | * If the peer had to authenticate, notify it now.
|
---|
| 877 | */
|
---|
| 878 | if (0
|
---|
| 879 | #if CHAP_SUPPORT
|
---|
| 880 | || go->neg_chap
|
---|
| 881 | #endif /* CHAP_SUPPORT */
|
---|
| 882 | #if PAP_SUPPORT
|
---|
| 883 | || go->neg_upap
|
---|
| 884 | #endif /* PAP_SUPPORT */
|
---|
| 885 | #if EAP_SUPPORT
|
---|
| 886 | || go->neg_eap
|
---|
| 887 | #endif /* EAP_SUPPORT */
|
---|
| 888 | ) {
|
---|
| 889 | notify(auth_up_notifier, 0);
|
---|
| 890 | }
|
---|
| 891 | #endif /* PPP_NOTIFY */
|
---|
| 892 |
|
---|
| 893 | #if CBCP_SUPPORT
|
---|
| 894 | /*
|
---|
| 895 | * If we negotiated callback, do it now.
|
---|
| 896 | */
|
---|
| 897 | if (go->neg_cbcp) {
|
---|
| 898 | new_phase(pcb, PPP_PHASE_CALLBACK);
|
---|
| 899 | (*cbcp_protent.open)(pcb);
|
---|
| 900 | return;
|
---|
| 901 | }
|
---|
| 902 | #endif
|
---|
| 903 |
|
---|
| 904 | #if PPP_OPTIONS
|
---|
| 905 | /*
|
---|
| 906 | * Process extra options from the secrets file
|
---|
| 907 | */
|
---|
| 908 | if (extra_options) {
|
---|
| 909 | options_from_list(extra_options, 1);
|
---|
| 910 | free_wordlist(extra_options);
|
---|
| 911 | extra_options = 0;
|
---|
| 912 | }
|
---|
| 913 | #endif /* PPP_OPTIONS */
|
---|
| 914 | start_networks(pcb);
|
---|
| 915 | }
|
---|
| 916 |
|
---|
| 917 | void start_networks(ppp_pcb *pcb) {
|
---|
| 918 | #if CCP_SUPPORT || ECP_SUPPORT
|
---|
| 919 | int i;
|
---|
| 920 | const struct protent *protp;
|
---|
| 921 | #endif /* CCP_SUPPORT || ECP_SUPPORT */
|
---|
| 922 |
|
---|
| 923 | new_phase(pcb, PPP_PHASE_NETWORK);
|
---|
| 924 |
|
---|
| 925 | #ifdef HAVE_MULTILINK
|
---|
| 926 | if (multilink) {
|
---|
| 927 | if (mp_join_bundle()) {
|
---|
| 928 | if (multilink_join_hook)
|
---|
| 929 | (*multilink_join_hook)();
|
---|
| 930 | if (updetach && !nodetach)
|
---|
| 931 | detach();
|
---|
| 932 | return;
|
---|
| 933 | }
|
---|
| 934 | }
|
---|
| 935 | #endif /* HAVE_MULTILINK */
|
---|
| 936 |
|
---|
| 937 | #ifdef PPP_FILTER
|
---|
| 938 | if (!demand)
|
---|
| 939 | set_filters(&pass_filter, &active_filter);
|
---|
| 940 | #endif
|
---|
| 941 | #if CCP_SUPPORT || ECP_SUPPORT
|
---|
| 942 | /* Start CCP and ECP */
|
---|
| 943 | for (i = 0; (protp = protocols[i]) != NULL; ++i)
|
---|
| 944 | if (
|
---|
| 945 | (0
|
---|
| 946 | #if ECP_SUPPORT
|
---|
| 947 | || protp->protocol == PPP_ECP
|
---|
| 948 | #endif /* ECP_SUPPORT */
|
---|
| 949 | #if CCP_SUPPORT
|
---|
| 950 | || protp->protocol == PPP_CCP
|
---|
| 951 | #endif /* CCP_SUPPORT */
|
---|
| 952 | )
|
---|
| 953 | && protp->open != NULL)
|
---|
| 954 | (*protp->open)(pcb);
|
---|
| 955 | #endif /* CCP_SUPPORT || ECP_SUPPORT */
|
---|
| 956 |
|
---|
| 957 | /*
|
---|
| 958 | * Bring up other network protocols iff encryption is not required.
|
---|
| 959 | */
|
---|
| 960 | if (1
|
---|
| 961 | #if ECP_SUPPORT
|
---|
| 962 | && !ecp_gotoptions[unit].required
|
---|
| 963 | #endif /* ECP_SUPPORT */
|
---|
| 964 | #if MPPE_SUPPORT
|
---|
| 965 | && !pcb->ccp_gotoptions.mppe
|
---|
| 966 | #endif /* MPPE_SUPPORT */
|
---|
| 967 | )
|
---|
| 968 | continue_networks(pcb);
|
---|
| 969 | }
|
---|
| 970 |
|
---|
| 971 | void continue_networks(ppp_pcb *pcb) {
|
---|
| 972 | int i;
|
---|
| 973 | const struct protent *protp;
|
---|
| 974 |
|
---|
| 975 | /*
|
---|
| 976 | * Start the "real" network protocols.
|
---|
| 977 | */
|
---|
| 978 | for (i = 0; (protp = protocols[i]) != NULL; ++i)
|
---|
| 979 | if (protp->protocol < 0xC000
|
---|
| 980 | #if CCP_SUPPORT
|
---|
| 981 | && protp->protocol != PPP_CCP
|
---|
| 982 | #endif /* CCP_SUPPORT */
|
---|
| 983 | #if ECP_SUPPORT
|
---|
| 984 | && protp->protocol != PPP_ECP
|
---|
| 985 | #endif /* ECP_SUPPORT */
|
---|
| 986 | && protp->open != NULL) {
|
---|
| 987 | (*protp->open)(pcb);
|
---|
| 988 | ++pcb->num_np_open;
|
---|
| 989 | }
|
---|
| 990 |
|
---|
| 991 | if (pcb->num_np_open == 0)
|
---|
| 992 | /* nothing to do */
|
---|
| 993 | lcp_close(pcb, "No network protocols running");
|
---|
| 994 | }
|
---|
| 995 |
|
---|
| 996 | #if PPP_AUTH_SUPPORT
|
---|
| 997 | #if PPP_SERVER
|
---|
| 998 | /*
|
---|
| 999 | * auth_check_passwd - Check the user name and passwd against configuration.
|
---|
| 1000 | *
|
---|
| 1001 | * returns:
|
---|
| 1002 | * 0: Authentication failed.
|
---|
| 1003 | * 1: Authentication succeeded.
|
---|
| 1004 | * In either case, msg points to an appropriate message and msglen to the message len.
|
---|
| 1005 | */
|
---|
| 1006 | int auth_check_passwd(ppp_pcb *pcb, char *auser, int userlen, char *apasswd, int passwdlen, const char **msg, int *msglen) {
|
---|
| 1007 | int secretuserlen;
|
---|
| 1008 | int secretpasswdlen;
|
---|
| 1009 |
|
---|
| 1010 | if (pcb->settings.user && pcb->settings.passwd) {
|
---|
| 1011 | secretuserlen = (int)strlen(pcb->settings.user);
|
---|
| 1012 | secretpasswdlen = (int)strlen(pcb->settings.passwd);
|
---|
| 1013 | if (secretuserlen == userlen
|
---|
| 1014 | && secretpasswdlen == passwdlen
|
---|
| 1015 | && !memcmp(auser, pcb->settings.user, userlen)
|
---|
| 1016 | && !memcmp(apasswd, pcb->settings.passwd, passwdlen) ) {
|
---|
| 1017 | *msg = "Login ok";
|
---|
| 1018 | *msglen = sizeof("Login ok")-1;
|
---|
| 1019 | return 1;
|
---|
| 1020 | }
|
---|
| 1021 | }
|
---|
| 1022 |
|
---|
| 1023 | *msg = "Login incorrect";
|
---|
| 1024 | *msglen = sizeof("Login incorrect")-1;
|
---|
| 1025 | return 0;
|
---|
| 1026 | }
|
---|
| 1027 |
|
---|
| 1028 | /*
|
---|
| 1029 | * The peer has failed to authenticate himself using `protocol'.
|
---|
| 1030 | */
|
---|
| 1031 | void auth_peer_fail(ppp_pcb *pcb, int protocol) {
|
---|
| 1032 | LWIP_UNUSED_ARG(protocol);
|
---|
| 1033 | /*
|
---|
| 1034 | * Authentication failure: take the link down
|
---|
| 1035 | */
|
---|
| 1036 | #if 0 /* UNUSED */
|
---|
| 1037 | status = EXIT_PEER_AUTH_FAILED;
|
---|
| 1038 | #endif /* UNUSED */
|
---|
| 1039 | pcb->err_code = PPPERR_AUTHFAIL;
|
---|
| 1040 | lcp_close(pcb, "Authentication failed");
|
---|
| 1041 | }
|
---|
| 1042 |
|
---|
| 1043 | /*
|
---|
| 1044 | * The peer has been successfully authenticated using `protocol'.
|
---|
| 1045 | */
|
---|
| 1046 | void auth_peer_success(ppp_pcb *pcb, int protocol, int prot_flavor, const char *name, int namelen) {
|
---|
| 1047 | int bit;
|
---|
| 1048 | #ifndef HAVE_MULTILINK
|
---|
| 1049 | LWIP_UNUSED_ARG(name);
|
---|
| 1050 | LWIP_UNUSED_ARG(namelen);
|
---|
| 1051 | #endif /* HAVE_MULTILINK */
|
---|
| 1052 |
|
---|
| 1053 | switch (protocol) {
|
---|
| 1054 | #if CHAP_SUPPORT
|
---|
| 1055 | case PPP_CHAP:
|
---|
| 1056 | bit = CHAP_PEER;
|
---|
| 1057 | switch (prot_flavor) {
|
---|
| 1058 | case CHAP_MD5:
|
---|
| 1059 | bit |= CHAP_MD5_PEER;
|
---|
| 1060 | break;
|
---|
| 1061 | #if MSCHAP_SUPPORT
|
---|
| 1062 | case CHAP_MICROSOFT:
|
---|
| 1063 | bit |= CHAP_MS_PEER;
|
---|
| 1064 | break;
|
---|
| 1065 | case CHAP_MICROSOFT_V2:
|
---|
| 1066 | bit |= CHAP_MS2_PEER;
|
---|
| 1067 | break;
|
---|
| 1068 | #endif /* MSCHAP_SUPPORT */
|
---|
| 1069 | default:
|
---|
| 1070 | break;
|
---|
| 1071 | }
|
---|
| 1072 | break;
|
---|
| 1073 | #endif /* CHAP_SUPPORT */
|
---|
| 1074 | #if PAP_SUPPORT
|
---|
| 1075 | case PPP_PAP:
|
---|
| 1076 | bit = PAP_PEER;
|
---|
| 1077 | break;
|
---|
| 1078 | #endif /* PAP_SUPPORT */
|
---|
| 1079 | #if EAP_SUPPORT
|
---|
| 1080 | case PPP_EAP:
|
---|
| 1081 | bit = EAP_PEER;
|
---|
| 1082 | break;
|
---|
| 1083 | #endif /* EAP_SUPPORT */
|
---|
| 1084 | default:
|
---|
| 1085 | ppp_warn("auth_peer_success: unknown protocol %x", protocol);
|
---|
| 1086 | return;
|
---|
| 1087 | }
|
---|
| 1088 |
|
---|
| 1089 | #ifdef HAVE_MULTILINK
|
---|
| 1090 | /*
|
---|
| 1091 | * Save the authenticated name of the peer for later.
|
---|
| 1092 | */
|
---|
| 1093 | if (namelen > (int)sizeof(pcb->peer_authname) - 1)
|
---|
| 1094 | namelen = (int)sizeof(pcb->peer_authname) - 1;
|
---|
| 1095 | MEMCPY(pcb->peer_authname, name, namelen);
|
---|
| 1096 | pcb->peer_authname[namelen] = 0;
|
---|
| 1097 | #endif /* HAVE_MULTILINK */
|
---|
| 1098 | #if 0 /* UNUSED */
|
---|
| 1099 | script_setenv("PEERNAME", , 0);
|
---|
| 1100 | #endif /* UNUSED */
|
---|
| 1101 |
|
---|
| 1102 | /* Save the authentication method for later. */
|
---|
| 1103 | pcb->auth_done |= bit;
|
---|
| 1104 |
|
---|
| 1105 | /*
|
---|
| 1106 | * If there is no more authentication still to be done,
|
---|
| 1107 | * proceed to the network (or callback) phase.
|
---|
| 1108 | */
|
---|
| 1109 | if ((pcb->auth_pending &= ~bit) == 0)
|
---|
| 1110 | network_phase(pcb);
|
---|
| 1111 | }
|
---|
| 1112 | #endif /* PPP_SERVER */
|
---|
| 1113 |
|
---|
| 1114 | /*
|
---|
| 1115 | * We have failed to authenticate ourselves to the peer using `protocol'.
|
---|
| 1116 | */
|
---|
| 1117 | void auth_withpeer_fail(ppp_pcb *pcb, int protocol) {
|
---|
| 1118 | LWIP_UNUSED_ARG(protocol);
|
---|
| 1119 | /*
|
---|
| 1120 | * We've failed to authenticate ourselves to our peer.
|
---|
| 1121 | *
|
---|
| 1122 | * Some servers keep sending CHAP challenges, but there
|
---|
| 1123 | * is no point in persisting without any way to get updated
|
---|
| 1124 | * authentication secrets.
|
---|
| 1125 | *
|
---|
| 1126 | * He'll probably take the link down, and there's not much
|
---|
| 1127 | * we can do except wait for that.
|
---|
| 1128 | */
|
---|
| 1129 | pcb->err_code = PPPERR_AUTHFAIL;
|
---|
| 1130 | lcp_close(pcb, "Failed to authenticate ourselves to peer");
|
---|
| 1131 | }
|
---|
| 1132 |
|
---|
| 1133 | /*
|
---|
| 1134 | * We have successfully authenticated ourselves with the peer using `protocol'.
|
---|
| 1135 | */
|
---|
| 1136 | void auth_withpeer_success(ppp_pcb *pcb, int protocol, int prot_flavor) {
|
---|
| 1137 | int bit;
|
---|
| 1138 | const char *prot = "";
|
---|
| 1139 |
|
---|
| 1140 | switch (protocol) {
|
---|
| 1141 | #if CHAP_SUPPORT
|
---|
| 1142 | case PPP_CHAP:
|
---|
| 1143 | bit = CHAP_WITHPEER;
|
---|
| 1144 | prot = "CHAP";
|
---|
| 1145 | switch (prot_flavor) {
|
---|
| 1146 | case CHAP_MD5:
|
---|
| 1147 | bit |= CHAP_MD5_WITHPEER;
|
---|
| 1148 | break;
|
---|
| 1149 | #if MSCHAP_SUPPORT
|
---|
| 1150 | case CHAP_MICROSOFT:
|
---|
| 1151 | bit |= CHAP_MS_WITHPEER;
|
---|
| 1152 | break;
|
---|
| 1153 | case CHAP_MICROSOFT_V2:
|
---|
| 1154 | bit |= CHAP_MS2_WITHPEER;
|
---|
| 1155 | break;
|
---|
| 1156 | #endif /* MSCHAP_SUPPORT */
|
---|
| 1157 | default:
|
---|
| 1158 | break;
|
---|
| 1159 | }
|
---|
| 1160 | break;
|
---|
| 1161 | #endif /* CHAP_SUPPORT */
|
---|
| 1162 | #if PAP_SUPPORT
|
---|
| 1163 | case PPP_PAP:
|
---|
| 1164 | bit = PAP_WITHPEER;
|
---|
| 1165 | prot = "PAP";
|
---|
| 1166 | break;
|
---|
| 1167 | #endif /* PAP_SUPPORT */
|
---|
| 1168 | #if EAP_SUPPORT
|
---|
| 1169 | case PPP_EAP:
|
---|
| 1170 | bit = EAP_WITHPEER;
|
---|
| 1171 | prot = "EAP";
|
---|
| 1172 | break;
|
---|
| 1173 | #endif /* EAP_SUPPORT */
|
---|
| 1174 | default:
|
---|
| 1175 | ppp_warn("auth_withpeer_success: unknown protocol %x", protocol);
|
---|
| 1176 | bit = 0;
|
---|
| 1177 | /* no break */
|
---|
| 1178 | }
|
---|
| 1179 |
|
---|
| 1180 | ppp_notice("%s authentication succeeded", prot);
|
---|
| 1181 |
|
---|
| 1182 | /* Save the authentication method for later. */
|
---|
| 1183 | pcb->auth_done |= bit;
|
---|
| 1184 |
|
---|
| 1185 | /*
|
---|
| 1186 | * If there is no more authentication still being done,
|
---|
| 1187 | * proceed to the network (or callback) phase.
|
---|
| 1188 | */
|
---|
| 1189 | if ((pcb->auth_pending &= ~bit) == 0)
|
---|
| 1190 | network_phase(pcb);
|
---|
| 1191 | }
|
---|
| 1192 | #endif /* PPP_AUTH_SUPPORT */
|
---|
| 1193 |
|
---|
| 1194 |
|
---|
| 1195 | /*
|
---|
| 1196 | * np_up - a network protocol has come up.
|
---|
| 1197 | */
|
---|
| 1198 | void np_up(ppp_pcb *pcb, int proto) {
|
---|
| 1199 | #if PPP_IDLETIMELIMIT
|
---|
| 1200 | int tlim;
|
---|
| 1201 | #endif /* PPP_IDLETIMELIMIT */
|
---|
| 1202 | LWIP_UNUSED_ARG(proto);
|
---|
| 1203 |
|
---|
| 1204 | if (pcb->num_np_up == 0) {
|
---|
| 1205 | /*
|
---|
| 1206 | * At this point we consider that the link has come up successfully.
|
---|
| 1207 | */
|
---|
| 1208 | new_phase(pcb, PPP_PHASE_RUNNING);
|
---|
| 1209 |
|
---|
| 1210 | #if PPP_IDLETIMELIMIT
|
---|
| 1211 | #if 0 /* UNUSED */
|
---|
| 1212 | if (idle_time_hook != 0)
|
---|
| 1213 | tlim = (*idle_time_hook)(NULL);
|
---|
| 1214 | else
|
---|
| 1215 | #endif /* UNUSED */
|
---|
| 1216 | tlim = pcb->settings.idle_time_limit;
|
---|
| 1217 | if (tlim > 0)
|
---|
| 1218 | TIMEOUT(check_idle, (void*)pcb, tlim);
|
---|
| 1219 | #endif /* PPP_IDLETIMELIMIT */
|
---|
| 1220 |
|
---|
| 1221 | #if PPP_MAXCONNECT
|
---|
| 1222 | /*
|
---|
| 1223 | * Set a timeout to close the connection once the maximum
|
---|
| 1224 | * connect time has expired.
|
---|
| 1225 | */
|
---|
| 1226 | if (pcb->settings.maxconnect > 0)
|
---|
| 1227 | TIMEOUT(connect_time_expired, (void*)pcb, pcb->settings.maxconnect);
|
---|
| 1228 | #endif /* PPP_MAXCONNECT */
|
---|
| 1229 |
|
---|
| 1230 | #ifdef MAXOCTETS
|
---|
| 1231 | if (maxoctets > 0)
|
---|
| 1232 | TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
|
---|
| 1233 | #endif
|
---|
| 1234 |
|
---|
| 1235 | #if 0 /* Unused */
|
---|
| 1236 | /*
|
---|
| 1237 | * Detach now, if the updetach option was given.
|
---|
| 1238 | */
|
---|
| 1239 | if (updetach && !nodetach)
|
---|
| 1240 | detach();
|
---|
| 1241 | #endif /* Unused */
|
---|
| 1242 | }
|
---|
| 1243 | ++pcb->num_np_up;
|
---|
| 1244 | }
|
---|
| 1245 |
|
---|
| 1246 | /*
|
---|
| 1247 | * np_down - a network protocol has gone down.
|
---|
| 1248 | */
|
---|
| 1249 | void np_down(ppp_pcb *pcb, int proto) {
|
---|
| 1250 | LWIP_UNUSED_ARG(proto);
|
---|
| 1251 | if (--pcb->num_np_up == 0) {
|
---|
| 1252 | #if PPP_IDLETIMELIMIT
|
---|
| 1253 | UNTIMEOUT(check_idle, (void*)pcb);
|
---|
| 1254 | #endif /* PPP_IDLETIMELIMIT */
|
---|
| 1255 | #if PPP_MAXCONNECT
|
---|
| 1256 | UNTIMEOUT(connect_time_expired, NULL);
|
---|
| 1257 | #endif /* PPP_MAXCONNECT */
|
---|
| 1258 | #ifdef MAXOCTETS
|
---|
| 1259 | UNTIMEOUT(check_maxoctets, NULL);
|
---|
| 1260 | #endif
|
---|
| 1261 | new_phase(pcb, PPP_PHASE_NETWORK);
|
---|
| 1262 | }
|
---|
| 1263 | }
|
---|
| 1264 |
|
---|
| 1265 | /*
|
---|
| 1266 | * np_finished - a network protocol has finished using the link.
|
---|
| 1267 | */
|
---|
| 1268 | void np_finished(ppp_pcb *pcb, int proto) {
|
---|
| 1269 | LWIP_UNUSED_ARG(proto);
|
---|
| 1270 | if (--pcb->num_np_open <= 0) {
|
---|
| 1271 | /* no further use for the link: shut up shop. */
|
---|
| 1272 | lcp_close(pcb, "No network protocols running");
|
---|
| 1273 | }
|
---|
| 1274 | }
|
---|
| 1275 |
|
---|
| 1276 | #ifdef MAXOCTETS
|
---|
| 1277 | static void
|
---|
| 1278 | check_maxoctets(arg)
|
---|
| 1279 | void *arg;
|
---|
| 1280 | {
|
---|
| 1281 | #if PPP_STATS_SUPPORT
|
---|
| 1282 | unsigned int used;
|
---|
| 1283 |
|
---|
| 1284 | update_link_stats(ifunit);
|
---|
| 1285 | link_stats_valid=0;
|
---|
| 1286 |
|
---|
| 1287 | switch(maxoctets_dir) {
|
---|
| 1288 | case PPP_OCTETS_DIRECTION_IN:
|
---|
| 1289 | used = link_stats.bytes_in;
|
---|
| 1290 | break;
|
---|
| 1291 | case PPP_OCTETS_DIRECTION_OUT:
|
---|
| 1292 | used = link_stats.bytes_out;
|
---|
| 1293 | break;
|
---|
| 1294 | case PPP_OCTETS_DIRECTION_MAXOVERAL:
|
---|
| 1295 | case PPP_OCTETS_DIRECTION_MAXSESSION:
|
---|
| 1296 | used = (link_stats.bytes_in > link_stats.bytes_out) ? link_stats.bytes_in : link_stats.bytes_out;
|
---|
| 1297 | break;
|
---|
| 1298 | default:
|
---|
| 1299 | used = link_stats.bytes_in+link_stats.bytes_out;
|
---|
| 1300 | break;
|
---|
| 1301 | }
|
---|
| 1302 | if (used > maxoctets) {
|
---|
| 1303 | ppp_notice("Traffic limit reached. Limit: %u Used: %u", maxoctets, used);
|
---|
| 1304 | status = EXIT_TRAFFIC_LIMIT;
|
---|
| 1305 | lcp_close(pcb, "Traffic limit");
|
---|
| 1306 | #if 0 /* UNUSED */
|
---|
| 1307 | need_holdoff = 0;
|
---|
| 1308 | #endif /* UNUSED */
|
---|
| 1309 | } else {
|
---|
| 1310 | TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
|
---|
| 1311 | }
|
---|
| 1312 | #endif /* PPP_STATS_SUPPORT */
|
---|
| 1313 | }
|
---|
| 1314 | #endif /* MAXOCTETS */
|
---|
| 1315 |
|
---|
| 1316 | #if PPP_IDLETIMELIMIT
|
---|
| 1317 | /*
|
---|
| 1318 | * check_idle - check whether the link has been idle for long
|
---|
| 1319 | * enough that we can shut it down.
|
---|
| 1320 | */
|
---|
| 1321 | static void check_idle(void *arg) {
|
---|
| 1322 | ppp_pcb *pcb = (ppp_pcb*)arg;
|
---|
| 1323 | struct ppp_idle idle;
|
---|
| 1324 | time_t itime;
|
---|
| 1325 | int tlim;
|
---|
| 1326 |
|
---|
| 1327 | if (!get_idle_time(pcb, &idle))
|
---|
| 1328 | return;
|
---|
| 1329 | #if 0 /* UNUSED */
|
---|
| 1330 | if (idle_time_hook != 0) {
|
---|
| 1331 | tlim = idle_time_hook(&idle);
|
---|
| 1332 | } else {
|
---|
| 1333 | #endif /* UNUSED */
|
---|
| 1334 | itime = LWIP_MIN(idle.xmit_idle, idle.recv_idle);
|
---|
| 1335 | tlim = pcb->settings.idle_time_limit - itime;
|
---|
| 1336 | #if 0 /* UNUSED */
|
---|
| 1337 | }
|
---|
| 1338 | #endif /* UNUSED */
|
---|
| 1339 | if (tlim <= 0) {
|
---|
| 1340 | /* link is idle: shut it down. */
|
---|
| 1341 | ppp_notice("Terminating connection due to lack of activity.");
|
---|
| 1342 | pcb->err_code = PPPERR_IDLETIMEOUT;
|
---|
| 1343 | lcp_close(pcb, "Link inactive");
|
---|
| 1344 | #if 0 /* UNUSED */
|
---|
| 1345 | need_holdoff = 0;
|
---|
| 1346 | #endif /* UNUSED */
|
---|
| 1347 | } else {
|
---|
| 1348 | TIMEOUT(check_idle, (void*)pcb, tlim);
|
---|
| 1349 | }
|
---|
| 1350 | }
|
---|
| 1351 | #endif /* PPP_IDLETIMELIMIT */
|
---|
| 1352 |
|
---|
| 1353 | #if PPP_MAXCONNECT
|
---|
| 1354 | /*
|
---|
| 1355 | * connect_time_expired - log a message and close the connection.
|
---|
| 1356 | */
|
---|
| 1357 | static void connect_time_expired(void *arg) {
|
---|
| 1358 | ppp_pcb *pcb = (ppp_pcb*)arg;
|
---|
| 1359 | ppp_info("Connect time expired");
|
---|
| 1360 | pcb->err_code = PPPERR_CONNECTTIME;
|
---|
| 1361 | lcp_close(pcb, "Connect time expired"); /* Close connection */
|
---|
| 1362 | }
|
---|
| 1363 | #endif /* PPP_MAXCONNECT */
|
---|
| 1364 |
|
---|
| 1365 | #if PPP_OPTIONS
|
---|
| 1366 | /*
|
---|
| 1367 | * auth_check_options - called to check authentication options.
|
---|
| 1368 | */
|
---|
| 1369 | void
|
---|
| 1370 | auth_check_options()
|
---|
| 1371 | {
|
---|
| 1372 | lcp_options *wo = &lcp_wantoptions[0];
|
---|
| 1373 | int can_auth;
|
---|
| 1374 | int lacks_ip;
|
---|
| 1375 |
|
---|
| 1376 | /* Default our_name to hostname, and user to our_name */
|
---|
| 1377 | if (our_name[0] == 0 || usehostname)
|
---|
| 1378 | strlcpy(our_name, hostname, sizeof(our_name));
|
---|
| 1379 | /* If a blank username was explicitly given as an option, trust
|
---|
| 1380 | the user and don't use our_name */
|
---|
| 1381 | if (ppp_settings.user[0] == 0 && !explicit_user)
|
---|
| 1382 | strlcpy(ppp_settings.user, our_name, sizeof(ppp_settings.user));
|
---|
| 1383 |
|
---|
| 1384 | /*
|
---|
| 1385 | * If we have a default route, require the peer to authenticate
|
---|
| 1386 | * unless the noauth option was given or the real user is root.
|
---|
| 1387 | */
|
---|
| 1388 | if (!auth_required && !allow_any_ip && have_route_to(0) && !privileged) {
|
---|
| 1389 | auth_required = 1;
|
---|
| 1390 | default_auth = 1;
|
---|
| 1391 | }
|
---|
| 1392 |
|
---|
| 1393 | #if CHAP_SUPPORT
|
---|
| 1394 | /* If we selected any CHAP flavors, we should probably negotiate it. :-) */
|
---|
| 1395 | if (wo->chap_mdtype)
|
---|
| 1396 | wo->neg_chap = 1;
|
---|
| 1397 | #endif /* CHAP_SUPPORT */
|
---|
| 1398 |
|
---|
| 1399 | /* If authentication is required, ask peer for CHAP, PAP, or EAP. */
|
---|
| 1400 | if (auth_required) {
|
---|
| 1401 | allow_any_ip = 0;
|
---|
| 1402 | if (1
|
---|
| 1403 | #if CHAP_SUPPORT
|
---|
| 1404 | && !wo->neg_chap
|
---|
| 1405 | #endif /* CHAP_SUPPORT */
|
---|
| 1406 | #if PAP_SUPPORT
|
---|
| 1407 | && !wo->neg_upap
|
---|
| 1408 | #endif /* PAP_SUPPORT */
|
---|
| 1409 | #if EAP_SUPPORT
|
---|
| 1410 | && !wo->neg_eap
|
---|
| 1411 | #endif /* EAP_SUPPORT */
|
---|
| 1412 | ) {
|
---|
| 1413 | #if CHAP_SUPPORT
|
---|
| 1414 | wo->neg_chap = CHAP_MDTYPE_SUPPORTED != MDTYPE_NONE;
|
---|
| 1415 | wo->chap_mdtype = CHAP_MDTYPE_SUPPORTED;
|
---|
| 1416 | #endif /* CHAP_SUPPORT */
|
---|
| 1417 | #if PAP_SUPPORT
|
---|
| 1418 | wo->neg_upap = 1;
|
---|
| 1419 | #endif /* PAP_SUPPORT */
|
---|
| 1420 | #if EAP_SUPPORT
|
---|
| 1421 | wo->neg_eap = 1;
|
---|
| 1422 | #endif /* EAP_SUPPORT */
|
---|
| 1423 | }
|
---|
| 1424 | } else {
|
---|
| 1425 | #if CHAP_SUPPORT
|
---|
| 1426 | wo->neg_chap = 0;
|
---|
| 1427 | wo->chap_mdtype = MDTYPE_NONE;
|
---|
| 1428 | #endif /* CHAP_SUPPORT */
|
---|
| 1429 | #if PAP_SUPPORT
|
---|
| 1430 | wo->neg_upap = 0;
|
---|
| 1431 | #endif /* PAP_SUPPORT */
|
---|
| 1432 | #if EAP_SUPPORT
|
---|
| 1433 | wo->neg_eap = 0;
|
---|
| 1434 | #endif /* EAP_SUPPORT */
|
---|
| 1435 | }
|
---|
| 1436 |
|
---|
| 1437 | /*
|
---|
| 1438 | * Check whether we have appropriate secrets to use
|
---|
| 1439 | * to authenticate the peer. Note that EAP can authenticate by way
|
---|
| 1440 | * of a CHAP-like exchanges as well as SRP.
|
---|
| 1441 | */
|
---|
| 1442 | lacks_ip = 0;
|
---|
| 1443 | #if PAP_SUPPORT
|
---|
| 1444 | can_auth = wo->neg_upap && (uselogin || have_pap_secret(&lacks_ip));
|
---|
| 1445 | #else
|
---|
| 1446 | can_auth = 0;
|
---|
| 1447 | #endif /* PAP_SUPPORT */
|
---|
| 1448 | if (!can_auth && (0
|
---|
| 1449 | #if CHAP_SUPPORT
|
---|
| 1450 | || wo->neg_chap
|
---|
| 1451 | #endif /* CHAP_SUPPORT */
|
---|
| 1452 | #if EAP_SUPPORT
|
---|
| 1453 | || wo->neg_eap
|
---|
| 1454 | #endif /* EAP_SUPPORT */
|
---|
| 1455 | )) {
|
---|
| 1456 | #if CHAP_SUPPORT
|
---|
| 1457 | can_auth = have_chap_secret((explicit_remote? remote_name: NULL),
|
---|
| 1458 | our_name, 1, &lacks_ip);
|
---|
| 1459 | #else
|
---|
| 1460 | can_auth = 0;
|
---|
| 1461 | #endif
|
---|
| 1462 | }
|
---|
| 1463 | if (!can_auth
|
---|
| 1464 | #if EAP_SUPPORT
|
---|
| 1465 | && wo->neg_eap
|
---|
| 1466 | #endif /* EAP_SUPPORT */
|
---|
| 1467 | ) {
|
---|
| 1468 | can_auth = have_srp_secret((explicit_remote? remote_name: NULL),
|
---|
| 1469 | our_name, 1, &lacks_ip);
|
---|
| 1470 | }
|
---|
| 1471 |
|
---|
| 1472 | if (auth_required && !can_auth && noauth_addrs == NULL) {
|
---|
| 1473 | if (default_auth) {
|
---|
| 1474 | option_error(
|
---|
| 1475 | "By default the remote system is required to authenticate itself");
|
---|
| 1476 | option_error(
|
---|
| 1477 | "(because this system has a default route to the internet)");
|
---|
| 1478 | } else if (explicit_remote)
|
---|
| 1479 | option_error(
|
---|
| 1480 | "The remote system (%s) is required to authenticate itself",
|
---|
| 1481 | remote_name);
|
---|
| 1482 | else
|
---|
| 1483 | option_error(
|
---|
| 1484 | "The remote system is required to authenticate itself");
|
---|
| 1485 | option_error(
|
---|
| 1486 | "but I couldn't find any suitable secret (password) for it to use to do so.");
|
---|
| 1487 | if (lacks_ip)
|
---|
| 1488 | option_error(
|
---|
| 1489 | "(None of the available passwords would let it use an IP address.)");
|
---|
| 1490 |
|
---|
| 1491 | exit(1);
|
---|
| 1492 | }
|
---|
| 1493 |
|
---|
| 1494 | /*
|
---|
| 1495 | * Early check for remote number authorization.
|
---|
| 1496 | */
|
---|
| 1497 | if (!auth_number()) {
|
---|
| 1498 | ppp_warn("calling number %q is not authorized", remote_number);
|
---|
| 1499 | exit(EXIT_CNID_AUTH_FAILED);
|
---|
| 1500 | }
|
---|
| 1501 | }
|
---|
| 1502 | #endif /* PPP_OPTIONS */
|
---|
| 1503 |
|
---|
| 1504 | #if 0 /* UNUSED */
|
---|
| 1505 | /*
|
---|
| 1506 | * auth_reset - called when LCP is starting negotiations to recheck
|
---|
| 1507 | * authentication options, i.e. whether we have appropriate secrets
|
---|
| 1508 | * to use for authenticating ourselves and/or the peer.
|
---|
| 1509 | */
|
---|
| 1510 | void
|
---|
| 1511 | auth_reset(unit)
|
---|
| 1512 | int unit;
|
---|
| 1513 | {
|
---|
| 1514 | lcp_options *go = &lcp_gotoptions[unit];
|
---|
| 1515 | lcp_options *ao = &lcp_allowoptions[unit];
|
---|
| 1516 | int hadchap;
|
---|
| 1517 |
|
---|
| 1518 | hadchap = -1;
|
---|
| 1519 | ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
|
---|
| 1520 | ao->neg_chap = (!refuse_chap || !refuse_mschap || !refuse_mschap_v2)
|
---|
| 1521 | && (passwd[0] != 0 ||
|
---|
| 1522 | (hadchap = have_chap_secret(user, (explicit_remote? remote_name:
|
---|
| 1523 | NULL), 0, NULL)));
|
---|
| 1524 | ao->neg_eap = !refuse_eap && (
|
---|
| 1525 | passwd[0] != 0 ||
|
---|
| 1526 | (hadchap == 1 || (hadchap == -1 && have_chap_secret(user,
|
---|
| 1527 | (explicit_remote? remote_name: NULL), 0, NULL))) ||
|
---|
| 1528 | have_srp_secret(user, (explicit_remote? remote_name: NULL), 0, NULL));
|
---|
| 1529 |
|
---|
| 1530 | hadchap = -1;
|
---|
| 1531 | if (go->neg_upap && !uselogin && !have_pap_secret(NULL))
|
---|
| 1532 | go->neg_upap = 0;
|
---|
| 1533 | if (go->neg_chap) {
|
---|
| 1534 | if (!(hadchap = have_chap_secret((explicit_remote? remote_name: NULL),
|
---|
| 1535 | our_name, 1, NULL)))
|
---|
| 1536 | go->neg_chap = 0;
|
---|
| 1537 | }
|
---|
| 1538 | if (go->neg_eap &&
|
---|
| 1539 | (hadchap == 0 || (hadchap == -1 &&
|
---|
| 1540 | !have_chap_secret((explicit_remote? remote_name: NULL), our_name,
|
---|
| 1541 | 1, NULL))) &&
|
---|
| 1542 | !have_srp_secret((explicit_remote? remote_name: NULL), our_name, 1,
|
---|
| 1543 | NULL))
|
---|
| 1544 | go->neg_eap = 0;
|
---|
| 1545 | }
|
---|
| 1546 |
|
---|
| 1547 | /*
|
---|
| 1548 | * check_passwd - Check the user name and passwd against the PAP secrets
|
---|
| 1549 | * file. If requested, also check against the system password database,
|
---|
| 1550 | * and login the user if OK.
|
---|
| 1551 | *
|
---|
| 1552 | * returns:
|
---|
| 1553 | * UPAP_AUTHNAK: Authentication failed.
|
---|
| 1554 | * UPAP_AUTHACK: Authentication succeeded.
|
---|
| 1555 | * In either case, msg points to an appropriate message.
|
---|
| 1556 | */
|
---|
| 1557 | int
|
---|
| 1558 | check_passwd(unit, auser, userlen, apasswd, passwdlen, msg)
|
---|
| 1559 | int unit;
|
---|
| 1560 | char *auser;
|
---|
| 1561 | int userlen;
|
---|
| 1562 | char *apasswd;
|
---|
| 1563 | int passwdlen;
|
---|
| 1564 | char **msg;
|
---|
| 1565 | {
|
---|
| 1566 | return UPAP_AUTHNAK;
|
---|
| 1567 | int ret;
|
---|
| 1568 | char *filename;
|
---|
| 1569 | FILE *f;
|
---|
| 1570 | struct wordlist *addrs = NULL, *opts = NULL;
|
---|
| 1571 | char passwd[256], user[256];
|
---|
| 1572 | char secret[MAXWORDLEN];
|
---|
| 1573 | static int attempts = 0;
|
---|
| 1574 |
|
---|
| 1575 | /*
|
---|
| 1576 | * Make copies of apasswd and auser, then null-terminate them.
|
---|
| 1577 | * If there are unprintable characters in the password, make
|
---|
| 1578 | * them visible.
|
---|
| 1579 | */
|
---|
| 1580 | slprintf(ppp_settings.passwd, sizeof(ppp_settings.passwd), "%.*v", passwdlen, apasswd);
|
---|
| 1581 | slprintf(ppp_settings.user, sizeof(ppp_settings.user), "%.*v", userlen, auser);
|
---|
| 1582 | *msg = "";
|
---|
| 1583 |
|
---|
| 1584 | /*
|
---|
| 1585 | * Check if a plugin wants to handle this.
|
---|
| 1586 | */
|
---|
| 1587 | if (pap_auth_hook) {
|
---|
| 1588 | ret = (*pap_auth_hook)(ppp_settings.user, ppp_settings.passwd, msg, &addrs, &opts);
|
---|
| 1589 | if (ret >= 0) {
|
---|
| 1590 | /* note: set_allowed_addrs() saves opts (but not addrs):
|
---|
| 1591 | don't free it! */
|
---|
| 1592 | if (ret)
|
---|
| 1593 | set_allowed_addrs(unit, addrs, opts);
|
---|
| 1594 | else if (opts != 0)
|
---|
| 1595 | free_wordlist(opts);
|
---|
| 1596 | if (addrs != 0)
|
---|
| 1597 | free_wordlist(addrs);
|
---|
| 1598 | BZERO(ppp_settings.passwd, sizeof(ppp_settings.passwd));
|
---|
| 1599 | return ret? UPAP_AUTHACK: UPAP_AUTHNAK;
|
---|
| 1600 | }
|
---|
| 1601 | }
|
---|
| 1602 |
|
---|
| 1603 | /*
|
---|
| 1604 | * Open the file of pap secrets and scan for a suitable secret
|
---|
| 1605 | * for authenticating this user.
|
---|
| 1606 | */
|
---|
| 1607 | filename = _PATH_UPAPFILE;
|
---|
| 1608 | addrs = opts = NULL;
|
---|
| 1609 | ret = UPAP_AUTHNAK;
|
---|
| 1610 | f = fopen(filename, "r");
|
---|
| 1611 | if (f == NULL) {
|
---|
| 1612 | ppp_error("Can't open PAP password file %s: %m", filename);
|
---|
| 1613 |
|
---|
| 1614 | } else {
|
---|
| 1615 | check_access(f, filename);
|
---|
| 1616 | if (scan_authfile(f, ppp_settings.user, our_name, secret, &addrs, &opts, filename, 0) < 0) {
|
---|
| 1617 | ppp_warn("no PAP secret found for %s", user);
|
---|
| 1618 | } else {
|
---|
| 1619 | /*
|
---|
| 1620 | * If the secret is "@login", it means to check
|
---|
| 1621 | * the password against the login database.
|
---|
| 1622 | */
|
---|
| 1623 | int login_secret = strcmp(secret, "@login") == 0;
|
---|
| 1624 | ret = UPAP_AUTHACK;
|
---|
| 1625 | if (uselogin || login_secret) {
|
---|
| 1626 | /* login option or secret is @login */
|
---|
| 1627 | if (session_full(ppp_settings.user, ppp_settings.passwd, devnam, msg) == 0) {
|
---|
| 1628 | ret = UPAP_AUTHNAK;
|
---|
| 1629 | }
|
---|
| 1630 | } else if (session_mgmt) {
|
---|
| 1631 | if (session_check(ppp_settings.user, NULL, devnam, NULL) == 0) {
|
---|
| 1632 | ppp_warn("Peer %q failed PAP Session verification", user);
|
---|
| 1633 | ret = UPAP_AUTHNAK;
|
---|
| 1634 | }
|
---|
| 1635 | }
|
---|
| 1636 | if (secret[0] != 0 && !login_secret) {
|
---|
| 1637 | /* password given in pap-secrets - must match */
|
---|
| 1638 | if ((cryptpap || strcmp(ppp_settings.passwd, secret) != 0)
|
---|
| 1639 | && strcmp(crypt(ppp_settings.passwd, secret), secret) != 0)
|
---|
| 1640 | ret = UPAP_AUTHNAK;
|
---|
| 1641 | }
|
---|
| 1642 | }
|
---|
| 1643 | fclose(f);
|
---|
| 1644 | }
|
---|
| 1645 |
|
---|
| 1646 | if (ret == UPAP_AUTHNAK) {
|
---|
| 1647 | if (**msg == 0)
|
---|
| 1648 | *msg = "Login incorrect";
|
---|
| 1649 | /*
|
---|
| 1650 | * XXX can we ever get here more than once??
|
---|
| 1651 | * Frustrate passwd stealer programs.
|
---|
| 1652 | * Allow 10 tries, but start backing off after 3 (stolen from login).
|
---|
| 1653 | * On 10'th, drop the connection.
|
---|
| 1654 | */
|
---|
| 1655 | if (attempts++ >= 10) {
|
---|
| 1656 | ppp_warn("%d LOGIN FAILURES ON %s, %s", attempts, devnam, user);
|
---|
| 1657 | lcp_close(pcb, "login failed");
|
---|
| 1658 | }
|
---|
| 1659 | if (attempts > 3)
|
---|
| 1660 | sleep((u_int) (attempts - 3) * 5);
|
---|
| 1661 | if (opts != NULL)
|
---|
| 1662 | free_wordlist(opts);
|
---|
| 1663 |
|
---|
| 1664 | } else {
|
---|
| 1665 | attempts = 0; /* Reset count */
|
---|
| 1666 | if (**msg == 0)
|
---|
| 1667 | *msg = "Login ok";
|
---|
| 1668 | set_allowed_addrs(unit, addrs, opts);
|
---|
| 1669 | }
|
---|
| 1670 |
|
---|
| 1671 | if (addrs != NULL)
|
---|
| 1672 | free_wordlist(addrs);
|
---|
| 1673 | BZERO(ppp_settings.passwd, sizeof(ppp_settings.passwd));
|
---|
| 1674 | BZERO(secret, sizeof(secret));
|
---|
| 1675 |
|
---|
| 1676 | return ret;
|
---|
| 1677 | }
|
---|
| 1678 |
|
---|
| 1679 | /*
|
---|
| 1680 | * null_login - Check if a username of "" and a password of "" are
|
---|
| 1681 | * acceptable, and iff so, set the list of acceptable IP addresses
|
---|
| 1682 | * and return 1.
|
---|
| 1683 | */
|
---|
| 1684 | static int
|
---|
| 1685 | null_login(unit)
|
---|
| 1686 | int unit;
|
---|
| 1687 | {
|
---|
| 1688 | char *filename;
|
---|
| 1689 | FILE *f;
|
---|
| 1690 | int i, ret;
|
---|
| 1691 | struct wordlist *addrs, *opts;
|
---|
| 1692 | char secret[MAXWORDLEN];
|
---|
| 1693 |
|
---|
| 1694 | /*
|
---|
| 1695 | * Check if a plugin wants to handle this.
|
---|
| 1696 | */
|
---|
| 1697 | ret = -1;
|
---|
| 1698 | if (null_auth_hook)
|
---|
| 1699 | ret = (*null_auth_hook)(&addrs, &opts);
|
---|
| 1700 |
|
---|
| 1701 | /*
|
---|
| 1702 | * Open the file of pap secrets and scan for a suitable secret.
|
---|
| 1703 | */
|
---|
| 1704 | if (ret <= 0) {
|
---|
| 1705 | filename = _PATH_UPAPFILE;
|
---|
| 1706 | addrs = NULL;
|
---|
| 1707 | f = fopen(filename, "r");
|
---|
| 1708 | if (f == NULL)
|
---|
| 1709 | return 0;
|
---|
| 1710 | check_access(f, filename);
|
---|
| 1711 |
|
---|
| 1712 | i = scan_authfile(f, "", our_name, secret, &addrs, &opts, filename, 0);
|
---|
| 1713 | ret = i >= 0 && secret[0] == 0;
|
---|
| 1714 | BZERO(secret, sizeof(secret));
|
---|
| 1715 | fclose(f);
|
---|
| 1716 | }
|
---|
| 1717 |
|
---|
| 1718 | if (ret)
|
---|
| 1719 | set_allowed_addrs(unit, addrs, opts);
|
---|
| 1720 | else if (opts != 0)
|
---|
| 1721 | free_wordlist(opts);
|
---|
| 1722 | if (addrs != 0)
|
---|
| 1723 | free_wordlist(addrs);
|
---|
| 1724 |
|
---|
| 1725 | return ret;
|
---|
| 1726 | }
|
---|
| 1727 |
|
---|
| 1728 | /*
|
---|
| 1729 | * get_pap_passwd - get a password for authenticating ourselves with
|
---|
| 1730 | * our peer using PAP. Returns 1 on success, 0 if no suitable password
|
---|
| 1731 | * could be found.
|
---|
| 1732 | * Assumes passwd points to MAXSECRETLEN bytes of space (if non-null).
|
---|
| 1733 | */
|
---|
| 1734 | static int
|
---|
| 1735 | get_pap_passwd(passwd)
|
---|
| 1736 | char *passwd;
|
---|
| 1737 | {
|
---|
| 1738 | char *filename;
|
---|
| 1739 | FILE *f;
|
---|
| 1740 | int ret;
|
---|
| 1741 | char secret[MAXWORDLEN];
|
---|
| 1742 |
|
---|
| 1743 | /*
|
---|
| 1744 | * Check whether a plugin wants to supply this.
|
---|
| 1745 | */
|
---|
| 1746 | if (pap_passwd_hook) {
|
---|
| 1747 | ret = (*pap_passwd_hook)(ppp_settings,user, ppp_settings.passwd);
|
---|
| 1748 | if (ret >= 0)
|
---|
| 1749 | return ret;
|
---|
| 1750 | }
|
---|
| 1751 |
|
---|
| 1752 | filename = _PATH_UPAPFILE;
|
---|
| 1753 | f = fopen(filename, "r");
|
---|
| 1754 | if (f == NULL)
|
---|
| 1755 | return 0;
|
---|
| 1756 | check_access(f, filename);
|
---|
| 1757 | ret = scan_authfile(f, user,
|
---|
| 1758 | (remote_name[0]? remote_name: NULL),
|
---|
| 1759 | secret, NULL, NULL, filename, 0);
|
---|
| 1760 | fclose(f);
|
---|
| 1761 | if (ret < 0)
|
---|
| 1762 | return 0;
|
---|
| 1763 | if (passwd != NULL)
|
---|
| 1764 | strlcpy(passwd, secret, MAXSECRETLEN);
|
---|
| 1765 | BZERO(secret, sizeof(secret));
|
---|
| 1766 | return 1;
|
---|
| 1767 | }
|
---|
| 1768 |
|
---|
| 1769 | /*
|
---|
| 1770 | * have_pap_secret - check whether we have a PAP file with any
|
---|
| 1771 | * secrets that we could possibly use for authenticating the peer.
|
---|
| 1772 | */
|
---|
| 1773 | static int
|
---|
| 1774 | have_pap_secret(lacks_ipp)
|
---|
| 1775 | int *lacks_ipp;
|
---|
| 1776 | {
|
---|
| 1777 | FILE *f;
|
---|
| 1778 | int ret;
|
---|
| 1779 | char *filename;
|
---|
| 1780 | struct wordlist *addrs;
|
---|
| 1781 |
|
---|
| 1782 | /* let the plugin decide, if there is one */
|
---|
| 1783 | if (pap_check_hook) {
|
---|
| 1784 | ret = (*pap_check_hook)();
|
---|
| 1785 | if (ret >= 0)
|
---|
| 1786 | return ret;
|
---|
| 1787 | }
|
---|
| 1788 |
|
---|
| 1789 | filename = _PATH_UPAPFILE;
|
---|
| 1790 | f = fopen(filename, "r");
|
---|
| 1791 | if (f == NULL)
|
---|
| 1792 | return 0;
|
---|
| 1793 |
|
---|
| 1794 | ret = scan_authfile(f, (explicit_remote? remote_name: NULL), our_name,
|
---|
| 1795 | NULL, &addrs, NULL, filename, 0);
|
---|
| 1796 | fclose(f);
|
---|
| 1797 | if (ret >= 0 && !some_ip_ok(addrs)) {
|
---|
| 1798 | if (lacks_ipp != 0)
|
---|
| 1799 | *lacks_ipp = 1;
|
---|
| 1800 | ret = -1;
|
---|
| 1801 | }
|
---|
| 1802 | if (addrs != 0)
|
---|
| 1803 | free_wordlist(addrs);
|
---|
| 1804 |
|
---|
| 1805 | return ret >= 0;
|
---|
| 1806 | }
|
---|
| 1807 |
|
---|
| 1808 | /*
|
---|
| 1809 | * have_chap_secret - check whether we have a CHAP file with a
|
---|
| 1810 | * secret that we could possibly use for authenticating `client'
|
---|
| 1811 | * on `server'. Either can be the null string, meaning we don't
|
---|
| 1812 | * know the identity yet.
|
---|
| 1813 | */
|
---|
| 1814 | static int
|
---|
| 1815 | have_chap_secret(client, server, need_ip, lacks_ipp)
|
---|
| 1816 | char *client;
|
---|
| 1817 | char *server;
|
---|
| 1818 | int need_ip;
|
---|
| 1819 | int *lacks_ipp;
|
---|
| 1820 | {
|
---|
| 1821 | FILE *f;
|
---|
| 1822 | int ret;
|
---|
| 1823 | char *filename;
|
---|
| 1824 | struct wordlist *addrs;
|
---|
| 1825 |
|
---|
| 1826 | if (chap_check_hook) {
|
---|
| 1827 | ret = (*chap_check_hook)();
|
---|
| 1828 | if (ret >= 0) {
|
---|
| 1829 | return ret;
|
---|
| 1830 | }
|
---|
| 1831 | }
|
---|
| 1832 |
|
---|
| 1833 | filename = _PATH_CHAPFILE;
|
---|
| 1834 | f = fopen(filename, "r");
|
---|
| 1835 | if (f == NULL)
|
---|
| 1836 | return 0;
|
---|
| 1837 |
|
---|
| 1838 | if (client != NULL && client[0] == 0)
|
---|
| 1839 | client = NULL;
|
---|
| 1840 | else if (server != NULL && server[0] == 0)
|
---|
| 1841 | server = NULL;
|
---|
| 1842 |
|
---|
| 1843 | ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
|
---|
| 1844 | fclose(f);
|
---|
| 1845 | if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
|
---|
| 1846 | if (lacks_ipp != 0)
|
---|
| 1847 | *lacks_ipp = 1;
|
---|
| 1848 | ret = -1;
|
---|
| 1849 | }
|
---|
| 1850 | if (addrs != 0)
|
---|
| 1851 | free_wordlist(addrs);
|
---|
| 1852 |
|
---|
| 1853 | return ret >= 0;
|
---|
| 1854 | }
|
---|
| 1855 |
|
---|
| 1856 | /*
|
---|
| 1857 | * have_srp_secret - check whether we have a SRP file with a
|
---|
| 1858 | * secret that we could possibly use for authenticating `client'
|
---|
| 1859 | * on `server'. Either can be the null string, meaning we don't
|
---|
| 1860 | * know the identity yet.
|
---|
| 1861 | */
|
---|
| 1862 | static int
|
---|
| 1863 | have_srp_secret(client, server, need_ip, lacks_ipp)
|
---|
| 1864 | char *client;
|
---|
| 1865 | char *server;
|
---|
| 1866 | int need_ip;
|
---|
| 1867 | int *lacks_ipp;
|
---|
| 1868 | {
|
---|
| 1869 | FILE *f;
|
---|
| 1870 | int ret;
|
---|
| 1871 | char *filename;
|
---|
| 1872 | struct wordlist *addrs;
|
---|
| 1873 |
|
---|
| 1874 | filename = _PATH_SRPFILE;
|
---|
| 1875 | f = fopen(filename, "r");
|
---|
| 1876 | if (f == NULL)
|
---|
| 1877 | return 0;
|
---|
| 1878 |
|
---|
| 1879 | if (client != NULL && client[0] == 0)
|
---|
| 1880 | client = NULL;
|
---|
| 1881 | else if (server != NULL && server[0] == 0)
|
---|
| 1882 | server = NULL;
|
---|
| 1883 |
|
---|
| 1884 | ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
|
---|
| 1885 | fclose(f);
|
---|
| 1886 | if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
|
---|
| 1887 | if (lacks_ipp != 0)
|
---|
| 1888 | *lacks_ipp = 1;
|
---|
| 1889 | ret = -1;
|
---|
| 1890 | }
|
---|
| 1891 | if (addrs != 0)
|
---|
| 1892 | free_wordlist(addrs);
|
---|
| 1893 |
|
---|
| 1894 | return ret >= 0;
|
---|
| 1895 | }
|
---|
| 1896 | #endif /* UNUSED */
|
---|
| 1897 |
|
---|
| 1898 | #if PPP_AUTH_SUPPORT
|
---|
| 1899 | /*
|
---|
| 1900 | * get_secret - open the CHAP secret file and return the secret
|
---|
| 1901 | * for authenticating the given client on the given server.
|
---|
| 1902 | * (We could be either client or server).
|
---|
| 1903 | */
|
---|
| 1904 | int get_secret(ppp_pcb *pcb, const char *client, const char *server, char *secret, int *secret_len, int am_server) {
|
---|
| 1905 | int len;
|
---|
| 1906 | LWIP_UNUSED_ARG(server);
|
---|
| 1907 | LWIP_UNUSED_ARG(am_server);
|
---|
| 1908 |
|
---|
| 1909 | if (!client || !client[0] || !pcb->settings.user || !pcb->settings.passwd || strcmp(client, pcb->settings.user)) {
|
---|
| 1910 | return 0;
|
---|
| 1911 | }
|
---|
| 1912 |
|
---|
| 1913 | len = (int)strlen(pcb->settings.passwd);
|
---|
| 1914 | if (len > MAXSECRETLEN) {
|
---|
| 1915 | ppp_error("Secret for %s on %s is too long", client, server);
|
---|
| 1916 | len = MAXSECRETLEN;
|
---|
| 1917 | }
|
---|
| 1918 |
|
---|
| 1919 | MEMCPY(secret, pcb->settings.passwd, len);
|
---|
| 1920 | *secret_len = len;
|
---|
| 1921 | return 1;
|
---|
| 1922 |
|
---|
| 1923 | #if 0 /* UNUSED */
|
---|
| 1924 | FILE *f;
|
---|
| 1925 | int ret, len;
|
---|
| 1926 | char *filename;
|
---|
| 1927 | struct wordlist *addrs, *opts;
|
---|
| 1928 | char secbuf[MAXWORDLEN];
|
---|
| 1929 | struct wordlist *addrs;
|
---|
| 1930 | addrs = NULL;
|
---|
| 1931 |
|
---|
| 1932 | if (!am_server && ppp_settings.passwd[0] != 0) {
|
---|
| 1933 | strlcpy(secbuf, ppp_settings.passwd, sizeof(secbuf));
|
---|
| 1934 | } else if (!am_server && chap_passwd_hook) {
|
---|
| 1935 | if ( (*chap_passwd_hook)(client, secbuf) < 0) {
|
---|
| 1936 | ppp_error("Unable to obtain CHAP password for %s on %s from plugin",
|
---|
| 1937 | client, server);
|
---|
| 1938 | return 0;
|
---|
| 1939 | }
|
---|
| 1940 | } else {
|
---|
| 1941 | filename = _PATH_CHAPFILE;
|
---|
| 1942 | addrs = NULL;
|
---|
| 1943 | secbuf[0] = 0;
|
---|
| 1944 |
|
---|
| 1945 | f = fopen(filename, "r");
|
---|
| 1946 | if (f == NULL) {
|
---|
| 1947 | ppp_error("Can't open chap secret file %s: %m", filename);
|
---|
| 1948 | return 0;
|
---|
| 1949 | }
|
---|
| 1950 | check_access(f, filename);
|
---|
| 1951 |
|
---|
| 1952 | ret = scan_authfile(f, client, server, secbuf, &addrs, &opts, filename, 0);
|
---|
| 1953 | fclose(f);
|
---|
| 1954 | if (ret < 0)
|
---|
| 1955 | return 0;
|
---|
| 1956 |
|
---|
| 1957 | if (am_server)
|
---|
| 1958 | set_allowed_addrs(unit, addrs, opts);
|
---|
| 1959 | else if (opts != 0)
|
---|
| 1960 | free_wordlist(opts);
|
---|
| 1961 | if (addrs != 0)
|
---|
| 1962 | free_wordlist(addrs);
|
---|
| 1963 | }
|
---|
| 1964 |
|
---|
| 1965 | len = strlen(secbuf);
|
---|
| 1966 | if (len > MAXSECRETLEN) {
|
---|
| 1967 | ppp_error("Secret for %s on %s is too long", client, server);
|
---|
| 1968 | len = MAXSECRETLEN;
|
---|
| 1969 | }
|
---|
| 1970 | MEMCPY(secret, secbuf, len);
|
---|
| 1971 | BZERO(secbuf, sizeof(secbuf));
|
---|
| 1972 | *secret_len = len;
|
---|
| 1973 |
|
---|
| 1974 | return 1;
|
---|
| 1975 | #endif /* UNUSED */
|
---|
| 1976 | }
|
---|
| 1977 | #endif /* PPP_AUTH_SUPPORT */
|
---|
| 1978 |
|
---|
| 1979 |
|
---|
| 1980 | #if 0 /* UNUSED */
|
---|
| 1981 | /*
|
---|
| 1982 | * get_srp_secret - open the SRP secret file and return the secret
|
---|
| 1983 | * for authenticating the given client on the given server.
|
---|
| 1984 | * (We could be either client or server).
|
---|
| 1985 | */
|
---|
| 1986 | int
|
---|
| 1987 | get_srp_secret(unit, client, server, secret, am_server)
|
---|
| 1988 | int unit;
|
---|
| 1989 | char *client;
|
---|
| 1990 | char *server;
|
---|
| 1991 | char *secret;
|
---|
| 1992 | int am_server;
|
---|
| 1993 | {
|
---|
| 1994 | FILE *fp;
|
---|
| 1995 | int ret;
|
---|
| 1996 | char *filename;
|
---|
| 1997 | struct wordlist *addrs, *opts;
|
---|
| 1998 |
|
---|
| 1999 | if (!am_server && ppp_settings.passwd[0] != '\0') {
|
---|
| 2000 | strlcpy(secret, ppp_settings.passwd, MAXWORDLEN);
|
---|
| 2001 | } else {
|
---|
| 2002 | filename = _PATH_SRPFILE;
|
---|
| 2003 | addrs = NULL;
|
---|
| 2004 |
|
---|
| 2005 | fp = fopen(filename, "r");
|
---|
| 2006 | if (fp == NULL) {
|
---|
| 2007 | ppp_error("Can't open srp secret file %s: %m", filename);
|
---|
| 2008 | return 0;
|
---|
| 2009 | }
|
---|
| 2010 | check_access(fp, filename);
|
---|
| 2011 |
|
---|
| 2012 | secret[0] = '\0';
|
---|
| 2013 | ret = scan_authfile(fp, client, server, secret, &addrs, &opts,
|
---|
| 2014 | filename, am_server);
|
---|
| 2015 | fclose(fp);
|
---|
| 2016 | if (ret < 0)
|
---|
| 2017 | return 0;
|
---|
| 2018 |
|
---|
| 2019 | if (am_server)
|
---|
| 2020 | set_allowed_addrs(unit, addrs, opts);
|
---|
| 2021 | else if (opts != NULL)
|
---|
| 2022 | free_wordlist(opts);
|
---|
| 2023 | if (addrs != NULL)
|
---|
| 2024 | free_wordlist(addrs);
|
---|
| 2025 | }
|
---|
| 2026 |
|
---|
| 2027 | return 1;
|
---|
| 2028 | }
|
---|
| 2029 |
|
---|
| 2030 | /*
|
---|
| 2031 | * set_allowed_addrs() - set the list of allowed addresses.
|
---|
| 2032 | * Also looks for `--' indicating options to apply for this peer
|
---|
| 2033 | * and leaves the following words in extra_options.
|
---|
| 2034 | */
|
---|
| 2035 | static void
|
---|
| 2036 | set_allowed_addrs(unit, addrs, opts)
|
---|
| 2037 | int unit;
|
---|
| 2038 | struct wordlist *addrs;
|
---|
| 2039 | struct wordlist *opts;
|
---|
| 2040 | {
|
---|
| 2041 | int n;
|
---|
| 2042 | struct wordlist *ap, **plink;
|
---|
| 2043 | struct permitted_ip *ip;
|
---|
| 2044 | char *ptr_word, *ptr_mask;
|
---|
| 2045 | struct hostent *hp;
|
---|
| 2046 | struct netent *np;
|
---|
| 2047 | u32_t a, mask, ah, offset;
|
---|
| 2048 | struct ipcp_options *wo = &ipcp_wantoptions[unit];
|
---|
| 2049 | u32_t suggested_ip = 0;
|
---|
| 2050 |
|
---|
| 2051 | if (addresses[unit] != NULL)
|
---|
| 2052 | free(addresses[unit]);
|
---|
| 2053 | addresses[unit] = NULL;
|
---|
| 2054 | if (extra_options != NULL)
|
---|
| 2055 | free_wordlist(extra_options);
|
---|
| 2056 | extra_options = opts;
|
---|
| 2057 |
|
---|
| 2058 | /*
|
---|
| 2059 | * Count the number of IP addresses given.
|
---|
| 2060 | */
|
---|
| 2061 | n = wordlist_count(addrs) + wordlist_count(noauth_addrs);
|
---|
| 2062 | if (n == 0)
|
---|
| 2063 | return;
|
---|
| 2064 | ip = (struct permitted_ip *) malloc((n + 1) * sizeof(struct permitted_ip));
|
---|
| 2065 | if (ip == 0)
|
---|
| 2066 | return;
|
---|
| 2067 |
|
---|
| 2068 | /* temporarily append the noauth_addrs list to addrs */
|
---|
| 2069 | for (plink = &addrs; *plink != NULL; plink = &(*plink)->next)
|
---|
| 2070 | ;
|
---|
| 2071 | *plink = noauth_addrs;
|
---|
| 2072 |
|
---|
| 2073 | n = 0;
|
---|
| 2074 | for (ap = addrs; ap != NULL; ap = ap->next) {
|
---|
| 2075 | /* "-" means no addresses authorized, "*" means any address allowed */
|
---|
| 2076 | ptr_word = ap->word;
|
---|
| 2077 | if (strcmp(ptr_word, "-") == 0)
|
---|
| 2078 | break;
|
---|
| 2079 | if (strcmp(ptr_word, "*") == 0) {
|
---|
| 2080 | ip[n].permit = 1;
|
---|
| 2081 | ip[n].base = ip[n].mask = 0;
|
---|
| 2082 | ++n;
|
---|
| 2083 | break;
|
---|
| 2084 | }
|
---|
| 2085 |
|
---|
| 2086 | ip[n].permit = 1;
|
---|
| 2087 | if (*ptr_word == '!') {
|
---|
| 2088 | ip[n].permit = 0;
|
---|
| 2089 | ++ptr_word;
|
---|
| 2090 | }
|
---|
| 2091 |
|
---|
| 2092 | mask = ~ (u32_t) 0;
|
---|
| 2093 | offset = 0;
|
---|
| 2094 | ptr_mask = strchr (ptr_word, '/');
|
---|
| 2095 | if (ptr_mask != NULL) {
|
---|
| 2096 | int bit_count;
|
---|
| 2097 | char *endp;
|
---|
| 2098 |
|
---|
| 2099 | bit_count = (int) strtol (ptr_mask+1, &endp, 10);
|
---|
| 2100 | if (bit_count <= 0 || bit_count > 32) {
|
---|
| 2101 | ppp_warn("invalid address length %v in auth. address list",
|
---|
| 2102 | ptr_mask+1);
|
---|
| 2103 | continue;
|
---|
| 2104 | }
|
---|
| 2105 | bit_count = 32 - bit_count; /* # bits in host part */
|
---|
| 2106 | if (*endp == '+') {
|
---|
| 2107 | offset = ifunit + 1;
|
---|
| 2108 | ++endp;
|
---|
| 2109 | }
|
---|
| 2110 | if (*endp != 0) {
|
---|
| 2111 | ppp_warn("invalid address length syntax: %v", ptr_mask+1);
|
---|
| 2112 | continue;
|
---|
| 2113 | }
|
---|
| 2114 | *ptr_mask = '\0';
|
---|
| 2115 | mask <<= bit_count;
|
---|
| 2116 | }
|
---|
| 2117 |
|
---|
| 2118 | hp = gethostbyname(ptr_word);
|
---|
| 2119 | if (hp != NULL && hp->h_addrtype == AF_INET) {
|
---|
| 2120 | a = *(u32_t *)hp->h_addr;
|
---|
| 2121 | } else {
|
---|
| 2122 | np = getnetbyname (ptr_word);
|
---|
| 2123 | if (np != NULL && np->n_addrtype == AF_INET) {
|
---|
| 2124 | a = lwip_htonl ((u32_t)np->n_net);
|
---|
| 2125 | if (ptr_mask == NULL) {
|
---|
| 2126 | /* calculate appropriate mask for net */
|
---|
| 2127 | ah = lwip_ntohl(a);
|
---|
| 2128 | if (IN_CLASSA(ah))
|
---|
| 2129 | mask = IN_CLASSA_NET;
|
---|
| 2130 | else if (IN_CLASSB(ah))
|
---|
| 2131 | mask = IN_CLASSB_NET;
|
---|
| 2132 | else if (IN_CLASSC(ah))
|
---|
| 2133 | mask = IN_CLASSC_NET;
|
---|
| 2134 | }
|
---|
| 2135 | } else {
|
---|
| 2136 | a = inet_addr (ptr_word);
|
---|
| 2137 | }
|
---|
| 2138 | }
|
---|
| 2139 |
|
---|
| 2140 | if (ptr_mask != NULL)
|
---|
| 2141 | *ptr_mask = '/';
|
---|
| 2142 |
|
---|
| 2143 | if (a == (u32_t)-1L) {
|
---|
| 2144 | ppp_warn("unknown host %s in auth. address list", ap->word);
|
---|
| 2145 | continue;
|
---|
| 2146 | }
|
---|
| 2147 | if (offset != 0) {
|
---|
| 2148 | if (offset >= ~mask) {
|
---|
| 2149 | ppp_warn("interface unit %d too large for subnet %v",
|
---|
| 2150 | ifunit, ptr_word);
|
---|
| 2151 | continue;
|
---|
| 2152 | }
|
---|
| 2153 | a = lwip_htonl((lwip_ntohl(a) & mask) + offset);
|
---|
| 2154 | mask = ~(u32_t)0;
|
---|
| 2155 | }
|
---|
| 2156 | ip[n].mask = lwip_htonl(mask);
|
---|
| 2157 | ip[n].base = a & ip[n].mask;
|
---|
| 2158 | ++n;
|
---|
| 2159 | if (~mask == 0 && suggested_ip == 0)
|
---|
| 2160 | suggested_ip = a;
|
---|
| 2161 | }
|
---|
| 2162 | *plink = NULL;
|
---|
| 2163 |
|
---|
| 2164 | ip[n].permit = 0; /* make the last entry forbid all addresses */
|
---|
| 2165 | ip[n].base = 0; /* to terminate the list */
|
---|
| 2166 | ip[n].mask = 0;
|
---|
| 2167 |
|
---|
| 2168 | addresses[unit] = ip;
|
---|
| 2169 |
|
---|
| 2170 | /*
|
---|
| 2171 | * If the address given for the peer isn't authorized, or if
|
---|
| 2172 | * the user hasn't given one, AND there is an authorized address
|
---|
| 2173 | * which is a single host, then use that if we find one.
|
---|
| 2174 | */
|
---|
| 2175 | if (suggested_ip != 0
|
---|
| 2176 | && (wo->hisaddr == 0 || !auth_ip_addr(unit, wo->hisaddr))) {
|
---|
| 2177 | wo->hisaddr = suggested_ip;
|
---|
| 2178 | /*
|
---|
| 2179 | * Do we insist on this address? No, if there are other
|
---|
| 2180 | * addresses authorized than the suggested one.
|
---|
| 2181 | */
|
---|
| 2182 | if (n > 1)
|
---|
| 2183 | wo->accept_remote = 1;
|
---|
| 2184 | }
|
---|
| 2185 | }
|
---|
| 2186 |
|
---|
| 2187 | /*
|
---|
| 2188 | * auth_ip_addr - check whether the peer is authorized to use
|
---|
| 2189 | * a given IP address. Returns 1 if authorized, 0 otherwise.
|
---|
| 2190 | */
|
---|
| 2191 | int
|
---|
| 2192 | auth_ip_addr(unit, addr)
|
---|
| 2193 | int unit;
|
---|
| 2194 | u32_t addr;
|
---|
| 2195 | {
|
---|
| 2196 | int ok;
|
---|
| 2197 |
|
---|
| 2198 | /* don't allow loopback or multicast address */
|
---|
| 2199 | if (bad_ip_adrs(addr))
|
---|
| 2200 | return 0;
|
---|
| 2201 |
|
---|
| 2202 | if (allowed_address_hook) {
|
---|
| 2203 | ok = allowed_address_hook(addr);
|
---|
| 2204 | if (ok >= 0) return ok;
|
---|
| 2205 | }
|
---|
| 2206 |
|
---|
| 2207 | if (addresses[unit] != NULL) {
|
---|
| 2208 | ok = ip_addr_check(addr, addresses[unit]);
|
---|
| 2209 | if (ok >= 0)
|
---|
| 2210 | return ok;
|
---|
| 2211 | }
|
---|
| 2212 |
|
---|
| 2213 | if (auth_required)
|
---|
| 2214 | return 0; /* no addresses authorized */
|
---|
| 2215 | return allow_any_ip || privileged || !have_route_to(addr);
|
---|
| 2216 | }
|
---|
| 2217 |
|
---|
| 2218 | static int
|
---|
| 2219 | ip_addr_check(addr, addrs)
|
---|
| 2220 | u32_t addr;
|
---|
| 2221 | struct permitted_ip *addrs;
|
---|
| 2222 | {
|
---|
| 2223 | for (; ; ++addrs)
|
---|
| 2224 | if ((addr & addrs->mask) == addrs->base)
|
---|
| 2225 | return addrs->permit;
|
---|
| 2226 | }
|
---|
| 2227 |
|
---|
| 2228 | /*
|
---|
| 2229 | * bad_ip_adrs - return 1 if the IP address is one we don't want
|
---|
| 2230 | * to use, such as an address in the loopback net or a multicast address.
|
---|
| 2231 | * addr is in network byte order.
|
---|
| 2232 | */
|
---|
| 2233 | int
|
---|
| 2234 | bad_ip_adrs(addr)
|
---|
| 2235 | u32_t addr;
|
---|
| 2236 | {
|
---|
| 2237 | addr = lwip_ntohl(addr);
|
---|
| 2238 | return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
|
---|
| 2239 | || IN_MULTICAST(addr) || IN_BADCLASS(addr);
|
---|
| 2240 | }
|
---|
| 2241 |
|
---|
| 2242 | /*
|
---|
| 2243 | * some_ip_ok - check a wordlist to see if it authorizes any
|
---|
| 2244 | * IP address(es).
|
---|
| 2245 | */
|
---|
| 2246 | static int
|
---|
| 2247 | some_ip_ok(addrs)
|
---|
| 2248 | struct wordlist *addrs;
|
---|
| 2249 | {
|
---|
| 2250 | for (; addrs != 0; addrs = addrs->next) {
|
---|
| 2251 | if (addrs->word[0] == '-')
|
---|
| 2252 | break;
|
---|
| 2253 | if (addrs->word[0] != '!')
|
---|
| 2254 | return 1; /* some IP address is allowed */
|
---|
| 2255 | }
|
---|
| 2256 | return 0;
|
---|
| 2257 | }
|
---|
| 2258 |
|
---|
| 2259 | /*
|
---|
| 2260 | * auth_number - check whether the remote number is allowed to connect.
|
---|
| 2261 | * Returns 1 if authorized, 0 otherwise.
|
---|
| 2262 | */
|
---|
| 2263 | int
|
---|
| 2264 | auth_number()
|
---|
| 2265 | {
|
---|
| 2266 | struct wordlist *wp = permitted_numbers;
|
---|
| 2267 | int l;
|
---|
| 2268 |
|
---|
| 2269 | /* Allow all if no authorization list. */
|
---|
| 2270 | if (!wp)
|
---|
| 2271 | return 1;
|
---|
| 2272 |
|
---|
| 2273 | /* Allow if we have a match in the authorization list. */
|
---|
| 2274 | while (wp) {
|
---|
| 2275 | /* trailing '*' wildcard */
|
---|
| 2276 | l = strlen(wp->word);
|
---|
| 2277 | if ((wp->word)[l - 1] == '*')
|
---|
| 2278 | l--;
|
---|
| 2279 | if (!strncasecmp(wp->word, remote_number, l))
|
---|
| 2280 | return 1;
|
---|
| 2281 | wp = wp->next;
|
---|
| 2282 | }
|
---|
| 2283 |
|
---|
| 2284 | return 0;
|
---|
| 2285 | }
|
---|
| 2286 |
|
---|
| 2287 | /*
|
---|
| 2288 | * check_access - complain if a secret file has too-liberal permissions.
|
---|
| 2289 | */
|
---|
| 2290 | static void
|
---|
| 2291 | check_access(f, filename)
|
---|
| 2292 | FILE *f;
|
---|
| 2293 | char *filename;
|
---|
| 2294 | {
|
---|
| 2295 | struct stat sbuf;
|
---|
| 2296 |
|
---|
| 2297 | if (fstat(fileno(f), &sbuf) < 0) {
|
---|
| 2298 | ppp_warn("cannot stat secret file %s: %m", filename);
|
---|
| 2299 | } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
|
---|
| 2300 | ppp_warn("Warning - secret file %s has world and/or group access",
|
---|
| 2301 | filename);
|
---|
| 2302 | }
|
---|
| 2303 | }
|
---|
| 2304 |
|
---|
| 2305 | /*
|
---|
| 2306 | * scan_authfile - Scan an authorization file for a secret suitable
|
---|
| 2307 | * for authenticating `client' on `server'. The return value is -1
|
---|
| 2308 | * if no secret is found, otherwise >= 0. The return value has
|
---|
| 2309 | * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
|
---|
| 2310 | * NONWILD_SERVER set if the secret didn't have "*" for the server.
|
---|
| 2311 | * Any following words on the line up to a "--" (i.e. address authorization
|
---|
| 2312 | * info) are placed in a wordlist and returned in *addrs. Any
|
---|
| 2313 | * following words (extra options) are placed in a wordlist and
|
---|
| 2314 | * returned in *opts.
|
---|
| 2315 | * We assume secret is NULL or points to MAXWORDLEN bytes of space.
|
---|
| 2316 | * Flags are non-zero if we need two colons in the secret in order to
|
---|
| 2317 | * match.
|
---|
| 2318 | */
|
---|
| 2319 | static int
|
---|
| 2320 | scan_authfile(f, client, server, secret, addrs, opts, filename, flags)
|
---|
| 2321 | FILE *f;
|
---|
| 2322 | char *client;
|
---|
| 2323 | char *server;
|
---|
| 2324 | char *secret;
|
---|
| 2325 | struct wordlist **addrs;
|
---|
| 2326 | struct wordlist **opts;
|
---|
| 2327 | char *filename;
|
---|
| 2328 | int flags;
|
---|
| 2329 | {
|
---|
| 2330 | int newline, xxx;
|
---|
| 2331 | int got_flag, best_flag;
|
---|
| 2332 | FILE *sf;
|
---|
| 2333 | struct wordlist *ap, *addr_list, *alist, **app;
|
---|
| 2334 | char word[MAXWORDLEN];
|
---|
| 2335 | char atfile[MAXWORDLEN];
|
---|
| 2336 | char lsecret[MAXWORDLEN];
|
---|
| 2337 | char *cp;
|
---|
| 2338 |
|
---|
| 2339 | if (addrs != NULL)
|
---|
| 2340 | *addrs = NULL;
|
---|
| 2341 | if (opts != NULL)
|
---|
| 2342 | *opts = NULL;
|
---|
| 2343 | addr_list = NULL;
|
---|
| 2344 | if (!getword(f, word, &newline, filename))
|
---|
| 2345 | return -1; /* file is empty??? */
|
---|
| 2346 | newline = 1;
|
---|
| 2347 | best_flag = -1;
|
---|
| 2348 | for (;;) {
|
---|
| 2349 | /*
|
---|
| 2350 | * Skip until we find a word at the start of a line.
|
---|
| 2351 | */
|
---|
| 2352 | while (!newline && getword(f, word, &newline, filename))
|
---|
| 2353 | ;
|
---|
| 2354 | if (!newline)
|
---|
| 2355 | break; /* got to end of file */
|
---|
| 2356 |
|
---|
| 2357 | /*
|
---|
| 2358 | * Got a client - check if it's a match or a wildcard.
|
---|
| 2359 | */
|
---|
| 2360 | got_flag = 0;
|
---|
| 2361 | if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
|
---|
| 2362 | newline = 0;
|
---|
| 2363 | continue;
|
---|
| 2364 | }
|
---|
| 2365 | if (!ISWILD(word))
|
---|
| 2366 | got_flag = NONWILD_CLIENT;
|
---|
| 2367 |
|
---|
| 2368 | /*
|
---|
| 2369 | * Now get a server and check if it matches.
|
---|
| 2370 | */
|
---|
| 2371 | if (!getword(f, word, &newline, filename))
|
---|
| 2372 | break;
|
---|
| 2373 | if (newline)
|
---|
| 2374 | continue;
|
---|
| 2375 | if (!ISWILD(word)) {
|
---|
| 2376 | if (server != NULL && strcmp(word, server) != 0)
|
---|
| 2377 | continue;
|
---|
| 2378 | got_flag |= NONWILD_SERVER;
|
---|
| 2379 | }
|
---|
| 2380 |
|
---|
| 2381 | /*
|
---|
| 2382 | * Got some sort of a match - see if it's better than what
|
---|
| 2383 | * we have already.
|
---|
| 2384 | */
|
---|
| 2385 | if (got_flag <= best_flag)
|
---|
| 2386 | continue;
|
---|
| 2387 |
|
---|
| 2388 | /*
|
---|
| 2389 | * Get the secret.
|
---|
| 2390 | */
|
---|
| 2391 | if (!getword(f, word, &newline, filename))
|
---|
| 2392 | break;
|
---|
| 2393 | if (newline)
|
---|
| 2394 | continue;
|
---|
| 2395 |
|
---|
| 2396 | /*
|
---|
| 2397 | * SRP-SHA1 authenticator should never be reading secrets from
|
---|
| 2398 | * a file. (Authenticatee may, though.)
|
---|
| 2399 | */
|
---|
| 2400 | if (flags && ((cp = strchr(word, ':')) == NULL ||
|
---|
| 2401 | strchr(cp + 1, ':') == NULL))
|
---|
| 2402 | continue;
|
---|
| 2403 |
|
---|
| 2404 | if (secret != NULL) {
|
---|
| 2405 | /*
|
---|
| 2406 | * Special syntax: @/pathname means read secret from file.
|
---|
| 2407 | */
|
---|
| 2408 | if (word[0] == '@' && word[1] == '/') {
|
---|
| 2409 | strlcpy(atfile, word+1, sizeof(atfile));
|
---|
| 2410 | if ((sf = fopen(atfile, "r")) == NULL) {
|
---|
| 2411 | ppp_warn("can't open indirect secret file %s", atfile);
|
---|
| 2412 | continue;
|
---|
| 2413 | }
|
---|
| 2414 | check_access(sf, atfile);
|
---|
| 2415 | if (!getword(sf, word, &xxx, atfile)) {
|
---|
| 2416 | ppp_warn("no secret in indirect secret file %s", atfile);
|
---|
| 2417 | fclose(sf);
|
---|
| 2418 | continue;
|
---|
| 2419 | }
|
---|
| 2420 | fclose(sf);
|
---|
| 2421 | }
|
---|
| 2422 | strlcpy(lsecret, word, sizeof(lsecret));
|
---|
| 2423 | }
|
---|
| 2424 |
|
---|
| 2425 | /*
|
---|
| 2426 | * Now read address authorization info and make a wordlist.
|
---|
| 2427 | */
|
---|
| 2428 | app = &alist;
|
---|
| 2429 | for (;;) {
|
---|
| 2430 | if (!getword(f, word, &newline, filename) || newline)
|
---|
| 2431 | break;
|
---|
| 2432 | ap = (struct wordlist *)
|
---|
| 2433 | malloc(sizeof(struct wordlist) + strlen(word) + 1);
|
---|
| 2434 | if (ap == NULL)
|
---|
| 2435 | novm("authorized addresses");
|
---|
| 2436 | ap->word = (char *) (ap + 1);
|
---|
| 2437 | strcpy(ap->word, word);
|
---|
| 2438 | *app = ap;
|
---|
| 2439 | app = &ap->next;
|
---|
| 2440 | }
|
---|
| 2441 | *app = NULL;
|
---|
| 2442 |
|
---|
| 2443 | /*
|
---|
| 2444 | * This is the best so far; remember it.
|
---|
| 2445 | */
|
---|
| 2446 | best_flag = got_flag;
|
---|
| 2447 | if (addr_list)
|
---|
| 2448 | free_wordlist(addr_list);
|
---|
| 2449 | addr_list = alist;
|
---|
| 2450 | if (secret != NULL)
|
---|
| 2451 | strlcpy(secret, lsecret, MAXWORDLEN);
|
---|
| 2452 |
|
---|
| 2453 | if (!newline)
|
---|
| 2454 | break;
|
---|
| 2455 | }
|
---|
| 2456 |
|
---|
| 2457 | /* scan for a -- word indicating the start of options */
|
---|
| 2458 | for (app = &addr_list; (ap = *app) != NULL; app = &ap->next)
|
---|
| 2459 | if (strcmp(ap->word, "--") == 0)
|
---|
| 2460 | break;
|
---|
| 2461 | /* ap = start of options */
|
---|
| 2462 | if (ap != NULL) {
|
---|
| 2463 | ap = ap->next; /* first option */
|
---|
| 2464 | free(*app); /* free the "--" word */
|
---|
| 2465 | *app = NULL; /* terminate addr list */
|
---|
| 2466 | }
|
---|
| 2467 | if (opts != NULL)
|
---|
| 2468 | *opts = ap;
|
---|
| 2469 | else if (ap != NULL)
|
---|
| 2470 | free_wordlist(ap);
|
---|
| 2471 | if (addrs != NULL)
|
---|
| 2472 | *addrs = addr_list;
|
---|
| 2473 | else if (addr_list != NULL)
|
---|
| 2474 | free_wordlist(addr_list);
|
---|
| 2475 |
|
---|
| 2476 | return best_flag;
|
---|
| 2477 | }
|
---|
| 2478 |
|
---|
| 2479 | /*
|
---|
| 2480 | * wordlist_count - return the number of items in a wordlist
|
---|
| 2481 | */
|
---|
| 2482 | static int
|
---|
| 2483 | wordlist_count(wp)
|
---|
| 2484 | struct wordlist *wp;
|
---|
| 2485 | {
|
---|
| 2486 | int n;
|
---|
| 2487 |
|
---|
| 2488 | for (n = 0; wp != NULL; wp = wp->next)
|
---|
| 2489 | ++n;
|
---|
| 2490 | return n;
|
---|
| 2491 | }
|
---|
| 2492 |
|
---|
| 2493 | /*
|
---|
| 2494 | * free_wordlist - release memory allocated for a wordlist.
|
---|
| 2495 | */
|
---|
| 2496 | static void
|
---|
| 2497 | free_wordlist(wp)
|
---|
| 2498 | struct wordlist *wp;
|
---|
| 2499 | {
|
---|
| 2500 | struct wordlist *next;
|
---|
| 2501 |
|
---|
| 2502 | while (wp != NULL) {
|
---|
| 2503 | next = wp->next;
|
---|
| 2504 | free(wp);
|
---|
| 2505 | wp = next;
|
---|
| 2506 | }
|
---|
| 2507 | }
|
---|
| 2508 | #endif /* UNUSED */
|
---|
| 2509 |
|
---|
| 2510 | #endif /* PPP_SUPPORT */
|
---|