[164] | 1 | /*****************************************************************************
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| 2 | * auth.c - Network Authentication and Phase Control program file.
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| 3 | *
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| 4 | * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
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| 5 | * Copyright (c) 1997 by Global Election Systems Inc. All rights reserved.
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| 6 | *
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| 7 | * The authors hereby grant permission to use, copy, modify, distribute,
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| 8 | * and license this software and its documentation for any purpose, provided
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| 9 | * that existing copyright notices are retained in all copies and that this
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| 10 | * notice and the following disclaimer are included verbatim in any
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| 11 | * distributions. No written agreement, license, or royalty fee is required
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| 12 | * for any of the authorized uses.
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| 13 | *
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| 14 | * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
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| 15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 17 | * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 24 | *
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| 25 | ******************************************************************************
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| 26 | * REVISION HISTORY
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| 27 | *
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| 28 | * 03-01-01 Marc Boucher <marc@mbsi.ca>
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| 29 | * Ported to lwIP.
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| 30 | * 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
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| 31 | * Ported from public pppd code.
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| 32 | *****************************************************************************/
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| 33 | /*
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| 34 | * auth.c - PPP authentication and phase control.
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| 35 | *
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| 36 | * Copyright (c) 1993 The Australian National University.
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| 37 | * All rights reserved.
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| 38 | *
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| 39 | * Redistribution and use in source and binary forms are permitted
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| 40 | * provided that the above copyright notice and this paragraph are
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| 41 | * duplicated in all such forms and that any documentation,
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| 42 | * advertising materials, and other materials related to such
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| 43 | * distribution and use acknowledge that the software was developed
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| 44 | * by the Australian National University. The name of the University
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| 45 | * may not be used to endorse or promote products derived from this
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| 46 | * software without specific prior written permission.
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| 47 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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| 48 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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| 49 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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| 50 | *
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| 51 | * Copyright (c) 1989 Carnegie Mellon University.
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| 52 | * All rights reserved.
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| 53 | *
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| 54 | * Redistribution and use in source and binary forms are permitted
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| 55 | * provided that the above copyright notice and this paragraph are
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| 56 | * duplicated in all such forms and that any documentation,
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| 57 | * advertising materials, and other materials related to such
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| 58 | * distribution and use acknowledge that the software was developed
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| 59 | * by Carnegie Mellon University. The name of the
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| 60 | * University may not be used to endorse or promote products derived
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| 61 | * from this software without specific prior written permission.
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| 62 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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| 63 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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| 64 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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| 65 | */
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| 66 |
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| 67 | #include "lwip/opt.h"
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| 68 |
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| 69 | #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
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| 70 |
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| 71 | #include "ppp_impl.h"
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| 72 | #include "pppdebug.h"
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| 73 |
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| 74 | #include "fsm.h"
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| 75 | #include "lcp.h"
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| 76 | #include "pap.h"
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| 77 | #include "chap.h"
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| 78 | #include "auth.h"
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| 79 | #include "ipcp.h"
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| 80 |
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| 81 | #if CBCP_SUPPORT
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| 82 | #include "cbcp.h"
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| 83 | #endif /* CBCP_SUPPORT */
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| 84 |
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| 85 | #include "lwip/inet.h"
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| 86 |
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| 87 | #include <string.h>
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| 88 |
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| 89 | #if 0 /* UNUSED */
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| 90 | /* Bits in scan_authfile return value */
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| 91 | #define NONWILD_SERVER 1
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| 92 | #define NONWILD_CLIENT 2
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| 93 |
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| 94 | #define ISWILD(word) (word[0] == '*' && word[1] == 0)
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| 95 | #endif /* UNUSED */
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| 96 |
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| 97 | #if PAP_SUPPORT || CHAP_SUPPORT
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| 98 | /* The name by which the peer authenticated itself to us. */
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| 99 | static char peer_authname[MAXNAMELEN];
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| 100 | #endif /* PAP_SUPPORT || CHAP_SUPPORT */
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| 101 |
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| 102 | /* Records which authentication operations haven't completed yet. */
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| 103 | static int auth_pending[NUM_PPP];
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| 104 |
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| 105 | /* Set if we have successfully called plogin() */
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| 106 | static int logged_in;
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| 107 |
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| 108 | /* Set if we have run the /etc/ppp/auth-up script. */
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| 109 | static int did_authup; /* @todo, we don't need this in lwip*/
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| 110 |
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| 111 | /* List of addresses which the peer may use. */
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| 112 | static struct wordlist *addresses[NUM_PPP];
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| 113 |
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| 114 | #if 0 /* UNUSED */
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| 115 | /* Wordlist giving addresses which the peer may use
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| 116 | without authenticating itself. */
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| 117 | static struct wordlist *noauth_addrs;
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| 118 |
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| 119 | /* Extra options to apply, from the secrets file entry for the peer. */
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| 120 | static struct wordlist *extra_options;
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| 121 | #endif /* UNUSED */
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| 122 |
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| 123 | /* Number of network protocols which we have opened. */
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| 124 | static int num_np_open;
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| 125 |
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| 126 | /* Number of network protocols which have come up. */
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| 127 | static int num_np_up;
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| 128 |
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| 129 | #if PAP_SUPPORT || CHAP_SUPPORT
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| 130 | /* Set if we got the contents of passwd[] from the pap-secrets file. */
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| 131 | static int passwd_from_file;
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| 132 | #endif /* PAP_SUPPORT || CHAP_SUPPORT */
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| 133 |
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| 134 | #if 0 /* UNUSED */
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| 135 | /* Set if we require authentication only because we have a default route. */
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| 136 | static bool default_auth;
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| 137 |
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| 138 | /* Hook to enable a plugin to control the idle time limit */
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| 139 | int (*idle_time_hook) __P((struct ppp_idle *)) = NULL;
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| 140 |
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| 141 | /* Hook for a plugin to say whether we can possibly authenticate any peer */
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| 142 | int (*pap_check_hook) __P((void)) = NULL;
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| 143 |
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| 144 | /* Hook for a plugin to check the PAP user and password */
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| 145 | int (*pap_auth_hook) __P((char *user, char *passwd, char **msgp,
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| 146 | struct wordlist **paddrs,
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| 147 | struct wordlist **popts)) = NULL;
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| 148 |
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| 149 | /* Hook for a plugin to know about the PAP user logout */
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| 150 | void (*pap_logout_hook) __P((void)) = NULL;
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| 151 |
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| 152 | /* Hook for a plugin to get the PAP password for authenticating us */
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| 153 | int (*pap_passwd_hook) __P((char *user, char *passwd)) = NULL;
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| 154 |
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| 155 | /*
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| 156 | * This is used to ensure that we don't start an auth-up/down
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| 157 | * script while one is already running.
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| 158 | */
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| 159 | enum script_state {
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| 160 | s_down,
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| 161 | s_up
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| 162 | };
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| 163 |
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| 164 | static enum script_state auth_state = s_down;
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| 165 | static enum script_state auth_script_state = s_down;
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| 166 | static pid_t auth_script_pid = 0;
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| 167 |
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| 168 | /*
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| 169 | * Option variables.
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| 170 | * lwip: some of these are present in the ppp_settings structure
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| 171 | */
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| 172 | bool uselogin = 0; /* Use /etc/passwd for checking PAP */
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| 173 | bool cryptpap = 0; /* Passwords in pap-secrets are encrypted */
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| 174 | bool refuse_pap = 0; /* Don't wanna auth. ourselves with PAP */
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| 175 | bool refuse_chap = 0; /* Don't wanna auth. ourselves with CHAP */
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| 176 | bool usehostname = 0; /* Use hostname for our_name */
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| 177 | bool auth_required = 0; /* Always require authentication from peer */
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| 178 | bool allow_any_ip = 0; /* Allow peer to use any IP address */
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| 179 | bool explicit_remote = 0; /* User specified explicit remote name */
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| 180 | char remote_name[MAXNAMELEN]; /* Peer's name for authentication */
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| 181 |
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| 182 | #endif /* UNUSED */
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| 183 |
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| 184 | /* Bits in auth_pending[] */
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| 185 | #define PAP_WITHPEER 1
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| 186 | #define PAP_PEER 2
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| 187 | #define CHAP_WITHPEER 4
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| 188 | #define CHAP_PEER 8
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| 189 |
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| 190 | /* @todo, move this somewhere */
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| 191 | /* Used for storing a sequence of words. Usually malloced. */
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| 192 | struct wordlist {
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| 193 | struct wordlist *next;
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| 194 | char word[1];
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| 195 | };
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| 196 |
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| 197 |
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| 198 | extern char *crypt (const char *, const char *);
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| 199 |
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| 200 | /* Prototypes for procedures local to this file. */
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| 201 |
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| 202 | static void network_phase (int);
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| 203 | static void check_idle (void *);
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| 204 | static void connect_time_expired (void *);
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| 205 | #if 0
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| 206 | static int plogin (char *, char *, char **, int *);
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| 207 | #endif
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| 208 | static void plogout (void);
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| 209 | static int null_login (int);
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| 210 | static int get_pap_passwd (int, char *, char *);
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| 211 | static int have_pap_secret (void);
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| 212 | static int have_chap_secret (char *, char *, u32_t);
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| 213 | static int ip_addr_check (u32_t, struct wordlist *);
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| 214 |
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| 215 | #if 0 /* PAP_SUPPORT || CHAP_SUPPORT */
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| 216 | static int scan_authfile (FILE *, char *, char *, char *,
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| 217 | struct wordlist **, struct wordlist **,
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| 218 | char *);
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| 219 | static void free_wordlist (struct wordlist *);
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| 220 | static void auth_script (char *);
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| 221 | static void auth_script_done (void *);
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| 222 | static void set_allowed_addrs (int unit, struct wordlist *addrs);
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| 223 | static int some_ip_ok (struct wordlist *);
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| 224 | static int setupapfile (char **);
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| 225 | static int privgroup (char **);
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| 226 | static int set_noauth_addr (char **);
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| 227 | static void check_access (FILE *, char *);
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| 228 | #endif /* 0 */ /* PAP_SUPPORT || CHAP_SUPPORT */
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| 229 |
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| 230 | #if 0 /* UNUSED */
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| 231 | /*
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| 232 | * Authentication-related options.
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| 233 | */
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| 234 | option_t auth_options[] = {
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| 235 | { "require-pap", o_bool, &lcp_wantoptions[0].neg_upap,
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| 236 | "Require PAP authentication from peer", 1, &auth_required },
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| 237 | { "+pap", o_bool, &lcp_wantoptions[0].neg_upap,
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| 238 | "Require PAP authentication from peer", 1, &auth_required },
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| 239 | { "refuse-pap", o_bool, &refuse_pap,
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| 240 | "Don't agree to auth to peer with PAP", 1 },
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| 241 | { "-pap", o_bool, &refuse_pap,
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| 242 | "Don't allow PAP authentication with peer", 1 },
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| 243 | { "require-chap", o_bool, &lcp_wantoptions[0].neg_chap,
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| 244 | "Require CHAP authentication from peer", 1, &auth_required },
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| 245 | { "+chap", o_bool, &lcp_wantoptions[0].neg_chap,
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| 246 | "Require CHAP authentication from peer", 1, &auth_required },
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| 247 | { "refuse-chap", o_bool, &refuse_chap,
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| 248 | "Don't agree to auth to peer with CHAP", 1 },
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| 249 | { "-chap", o_bool, &refuse_chap,
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| 250 | "Don't allow CHAP authentication with peer", 1 },
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| 251 | { "name", o_string, our_name,
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| 252 | "Set local name for authentication",
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| 253 | OPT_PRIV|OPT_STATIC, NULL, MAXNAMELEN },
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| 254 | { "user", o_string, user,
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| 255 | "Set name for auth with peer", OPT_STATIC, NULL, MAXNAMELEN },
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| 256 | { "usehostname", o_bool, &usehostname,
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| 257 | "Must use hostname for authentication", 1 },
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| 258 | { "remotename", o_string, remote_name,
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| 259 | "Set remote name for authentication", OPT_STATIC,
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| 260 | &explicit_remote, MAXNAMELEN },
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| 261 | { "auth", o_bool, &auth_required,
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| 262 | "Require authentication from peer", 1 },
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| 263 | { "noauth", o_bool, &auth_required,
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| 264 | "Don't require peer to authenticate", OPT_PRIV, &allow_any_ip },
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| 265 | { "login", o_bool, &uselogin,
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| 266 | "Use system password database for PAP", 1 },
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| 267 | { "papcrypt", o_bool, &cryptpap,
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| 268 | "PAP passwords are encrypted", 1 },
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| 269 | { "+ua", o_special, (void *)setupapfile,
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| 270 | "Get PAP user and password from file" },
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| 271 | { "password", o_string, passwd,
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| 272 | "Password for authenticating us to the peer", OPT_STATIC,
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| 273 | NULL, MAXSECRETLEN },
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| 274 | { "privgroup", o_special, (void *)privgroup,
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| 275 | "Allow group members to use privileged options", OPT_PRIV },
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| 276 | { "allow-ip", o_special, (void *)set_noauth_addr,
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| 277 | "Set IP address(es) which can be used without authentication",
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| 278 | OPT_PRIV },
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| 279 | { NULL }
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| 280 | };
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| 281 | #endif /* UNUSED */
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| 282 | #if 0 /* UNUSED */
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| 283 | /*
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| 284 | * setupapfile - specifies UPAP info for authenticating with peer.
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| 285 | */
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| 286 | static int
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| 287 | setupapfile(char **argv)
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| 288 | {
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| 289 | FILE * ufile;
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| 290 | int l;
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| 291 |
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| 292 | lcp_allowoptions[0].neg_upap = 1;
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| 293 |
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| 294 | /* open user info file */
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| 295 | seteuid(getuid());
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| 296 | ufile = fopen(*argv, "r");
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| 297 | seteuid(0);
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| 298 | if (ufile == NULL) {
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| 299 | option_error("unable to open user login data file %s", *argv);
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| 300 | return 0;
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| 301 | }
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| 302 | check_access(ufile, *argv);
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| 303 |
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| 304 | /* get username */
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| 305 | if (fgets(user, MAXNAMELEN - 1, ufile) == NULL
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| 306 | || fgets(passwd, MAXSECRETLEN - 1, ufile) == NULL){
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| 307 | option_error("unable to read user login data file %s", *argv);
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| 308 | return 0;
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| 309 | }
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| 310 | fclose(ufile);
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| 311 |
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| 312 | /* get rid of newlines */
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| 313 | l = strlen(user);
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| 314 | if (l > 0 && user[l-1] == '\n')
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| 315 | user[l-1] = 0;
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| 316 | l = strlen(passwd);
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| 317 | if (l > 0 && passwd[l-1] == '\n')
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| 318 | passwd[l-1] = 0;
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| 319 |
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| 320 | return (1);
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| 321 | }
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| 322 | #endif /* UNUSED */
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| 323 |
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| 324 | #if 0 /* UNUSED */
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| 325 | /*
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| 326 | * privgroup - allow members of the group to have privileged access.
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| 327 | */
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| 328 | static int
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| 329 | privgroup(char **argv)
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| 330 | {
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| 331 | struct group *g;
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| 332 | int i;
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| 333 |
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| 334 | g = getgrnam(*argv);
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| 335 | if (g == 0) {
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| 336 | option_error("group %s is unknown", *argv);
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| 337 | return 0;
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| 338 | }
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| 339 | for (i = 0; i < ngroups; ++i) {
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| 340 | if (groups[i] == g->gr_gid) {
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| 341 | privileged = 1;
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| 342 | break;
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| 343 | }
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| 344 | }
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| 345 | return 1;
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| 346 | }
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| 347 | #endif
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| 348 |
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| 349 | #if 0 /* UNUSED */
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| 350 | /*
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| 351 | * set_noauth_addr - set address(es) that can be used without authentication.
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| 352 | * Equivalent to specifying an entry like `"" * "" addr' in pap-secrets.
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| 353 | */
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| 354 | static int
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| 355 | set_noauth_addr(char **argv)
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| 356 | {
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| 357 | char *addr = *argv;
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| 358 | int l = strlen(addr);
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| 359 | struct wordlist *wp;
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| 360 |
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| 361 | wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l + 1);
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| 362 | if (wp == NULL)
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| 363 | novm("allow-ip argument");
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| 364 | wp->word = (char *) (wp + 1);
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| 365 | wp->next = noauth_addrs;
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| 366 | BCOPY(addr, wp->word, l);
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| 367 | noauth_addrs = wp;
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| 368 | return 1;
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| 369 | }
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| 370 | #endif /* UNUSED */
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| 371 |
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| 372 | /*
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| 373 | * An Open on LCP has requested a change from Dead to Establish phase.
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| 374 | * Do what's necessary to bring the physical layer up.
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| 375 | */
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| 376 | void
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| 377 | link_required(int unit)
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| 378 | {
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| 379 | LWIP_UNUSED_ARG(unit);
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| 380 |
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| 381 | AUTHDEBUG(LOG_INFO, ("link_required: %d\n", unit));
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| 382 | }
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| 383 |
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| 384 | /*
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| 385 | * LCP has terminated the link; go to the Dead phase and take the
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| 386 | * physical layer down.
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| 387 | */
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| 388 | void
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| 389 | link_terminated(int unit)
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| 390 | {
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| 391 | AUTHDEBUG(LOG_INFO, ("link_terminated: %d\n", unit));
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| 392 | if (lcp_phase[unit] == PHASE_DEAD) {
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| 393 | return;
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| 394 | }
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| 395 | if (logged_in) {
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| 396 | plogout();
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| 397 | }
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| 398 | lcp_phase[unit] = PHASE_DEAD;
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| 399 | AUTHDEBUG(LOG_NOTICE, ("Connection terminated.\n"));
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| 400 | pppLinkTerminated(unit);
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| 401 | }
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| 402 |
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| 403 | /*
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| 404 | * LCP has gone down; it will either die or try to re-establish.
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| 405 | */
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| 406 | void
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| 407 | link_down(int unit)
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| 408 | {
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| 409 | int i;
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| 410 | struct protent *protp;
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| 411 |
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| 412 | AUTHDEBUG(LOG_INFO, ("link_down: %d\n", unit));
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| 413 |
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| 414 | if (did_authup) {
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| 415 | /* XXX Do link down processing. */
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| 416 | did_authup = 0;
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| 417 | }
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| 418 | for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) {
|
---|
| 419 | if (!protp->enabled_flag) {
|
---|
| 420 | continue;
|
---|
| 421 | }
|
---|
| 422 | if (protp->protocol != PPP_LCP && protp->lowerdown != NULL) {
|
---|
| 423 | (*protp->lowerdown)(unit);
|
---|
| 424 | }
|
---|
| 425 | if (protp->protocol < 0xC000 && protp->close != NULL) {
|
---|
| 426 | (*protp->close)(unit, "LCP down");
|
---|
| 427 | }
|
---|
| 428 | }
|
---|
| 429 | num_np_open = 0; /* number of network protocols we have opened */
|
---|
| 430 | num_np_up = 0; /* Number of network protocols which have come up */
|
---|
| 431 |
|
---|
| 432 | if (lcp_phase[unit] != PHASE_DEAD) {
|
---|
| 433 | lcp_phase[unit] = PHASE_TERMINATE;
|
---|
| 434 | }
|
---|
| 435 | pppLinkDown(unit);
|
---|
| 436 | }
|
---|
| 437 |
|
---|
| 438 | /*
|
---|
| 439 | * The link is established.
|
---|
| 440 | * Proceed to the Dead, Authenticate or Network phase as appropriate.
|
---|
| 441 | */
|
---|
| 442 | void
|
---|
| 443 | link_established(int unit)
|
---|
| 444 | {
|
---|
| 445 | int auth;
|
---|
| 446 | int i;
|
---|
| 447 | struct protent *protp;
|
---|
| 448 | lcp_options *wo = &lcp_wantoptions[unit];
|
---|
| 449 | lcp_options *go = &lcp_gotoptions[unit];
|
---|
| 450 | #if PAP_SUPPORT || CHAP_SUPPORT
|
---|
| 451 | lcp_options *ho = &lcp_hisoptions[unit];
|
---|
| 452 | #endif /* PAP_SUPPORT || CHAP_SUPPORT */
|
---|
| 453 |
|
---|
| 454 | AUTHDEBUG(LOG_INFO, ("link_established: unit %d; Lowering up all protocols...\n", unit));
|
---|
| 455 | /*
|
---|
| 456 | * Tell higher-level protocols that LCP is up.
|
---|
| 457 | */
|
---|
| 458 | for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) {
|
---|
| 459 | if (protp->protocol != PPP_LCP && protp->enabled_flag && protp->lowerup != NULL) {
|
---|
| 460 | (*protp->lowerup)(unit);
|
---|
| 461 | }
|
---|
| 462 | }
|
---|
| 463 | if (ppp_settings.auth_required && !(go->neg_chap || go->neg_upap)) {
|
---|
| 464 | /*
|
---|
| 465 | * We wanted the peer to authenticate itself, and it refused:
|
---|
| 466 | * treat it as though it authenticated with PAP using a username
|
---|
| 467 | * of "" and a password of "". If that's not OK, boot it out.
|
---|
| 468 | */
|
---|
| 469 | if (!wo->neg_upap || !null_login(unit)) {
|
---|
| 470 | AUTHDEBUG(LOG_WARNING, ("peer refused to authenticate\n"));
|
---|
| 471 | lcp_close(unit, "peer refused to authenticate");
|
---|
| 472 | return;
|
---|
| 473 | }
|
---|
| 474 | }
|
---|
| 475 |
|
---|
| 476 | lcp_phase[unit] = PHASE_AUTHENTICATE;
|
---|
| 477 | auth = 0;
|
---|
| 478 | #if CHAP_SUPPORT
|
---|
| 479 | if (go->neg_chap) {
|
---|
| 480 | ChapAuthPeer(unit, ppp_settings.our_name, go->chap_mdtype);
|
---|
| 481 | auth |= CHAP_PEER;
|
---|
| 482 | }
|
---|
| 483 | #endif /* CHAP_SUPPORT */
|
---|
| 484 | #if PAP_SUPPORT && CHAP_SUPPORT
|
---|
| 485 | else
|
---|
| 486 | #endif /* PAP_SUPPORT && CHAP_SUPPORT */
|
---|
| 487 | #if PAP_SUPPORT
|
---|
| 488 | if (go->neg_upap) {
|
---|
| 489 | upap_authpeer(unit);
|
---|
| 490 | auth |= PAP_PEER;
|
---|
| 491 | }
|
---|
| 492 | #endif /* PAP_SUPPORT */
|
---|
| 493 | #if CHAP_SUPPORT
|
---|
| 494 | if (ho->neg_chap) {
|
---|
| 495 | ChapAuthWithPeer(unit, ppp_settings.user, ho->chap_mdtype);
|
---|
| 496 | auth |= CHAP_WITHPEER;
|
---|
| 497 | }
|
---|
| 498 | #endif /* CHAP_SUPPORT */
|
---|
| 499 | #if PAP_SUPPORT && CHAP_SUPPORT
|
---|
| 500 | else
|
---|
| 501 | #endif /* PAP_SUPPORT && CHAP_SUPPORT */
|
---|
| 502 | #if PAP_SUPPORT
|
---|
| 503 | if (ho->neg_upap) {
|
---|
| 504 | if (ppp_settings.passwd[0] == 0) {
|
---|
| 505 | passwd_from_file = 1;
|
---|
| 506 | if (!get_pap_passwd(unit, ppp_settings.user, ppp_settings.passwd)) {
|
---|
| 507 | AUTHDEBUG(LOG_ERR, ("No secret found for PAP login\n"));
|
---|
| 508 | }
|
---|
| 509 | }
|
---|
| 510 | upap_authwithpeer(unit, ppp_settings.user, ppp_settings.passwd);
|
---|
| 511 | auth |= PAP_WITHPEER;
|
---|
| 512 | }
|
---|
| 513 | #endif /* PAP_SUPPORT */
|
---|
| 514 | auth_pending[unit] = auth;
|
---|
| 515 |
|
---|
| 516 | if (!auth) {
|
---|
| 517 | network_phase(unit);
|
---|
| 518 | }
|
---|
| 519 | }
|
---|
| 520 |
|
---|
| 521 | /*
|
---|
| 522 | * Proceed to the network phase.
|
---|
| 523 | */
|
---|
| 524 | static void
|
---|
| 525 | network_phase(int unit)
|
---|
| 526 | {
|
---|
| 527 | int i;
|
---|
| 528 | struct protent *protp;
|
---|
| 529 | lcp_options *go = &lcp_gotoptions[unit];
|
---|
| 530 |
|
---|
| 531 | /*
|
---|
| 532 | * If the peer had to authenticate, run the auth-up script now.
|
---|
| 533 | */
|
---|
| 534 | if ((go->neg_chap || go->neg_upap) && !did_authup) {
|
---|
| 535 | /* XXX Do setup for peer authentication. */
|
---|
| 536 | did_authup = 1;
|
---|
| 537 | }
|
---|
| 538 |
|
---|
| 539 | #if CBCP_SUPPORT
|
---|
| 540 | /*
|
---|
| 541 | * If we negotiated callback, do it now.
|
---|
| 542 | */
|
---|
| 543 | if (go->neg_cbcp) {
|
---|
| 544 | lcp_phase[unit] = PHASE_CALLBACK;
|
---|
| 545 | (*cbcp_protent.open)(unit);
|
---|
| 546 | return;
|
---|
| 547 | }
|
---|
| 548 | #endif /* CBCP_SUPPORT */
|
---|
| 549 |
|
---|
| 550 | lcp_phase[unit] = PHASE_NETWORK;
|
---|
| 551 | for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) {
|
---|
| 552 | if (protp->protocol < 0xC000 && protp->enabled_flag && protp->open != NULL) {
|
---|
| 553 | (*protp->open)(unit);
|
---|
| 554 | if (protp->protocol != PPP_CCP) {
|
---|
| 555 | ++num_np_open;
|
---|
| 556 | }
|
---|
| 557 | }
|
---|
| 558 | }
|
---|
| 559 |
|
---|
| 560 | if (num_np_open == 0) {
|
---|
| 561 | /* nothing to do */
|
---|
| 562 | lcp_close(0, "No network protocols running");
|
---|
| 563 | }
|
---|
| 564 | }
|
---|
| 565 | /* @todo: add void start_networks(void) here (pppd 2.3.11) */
|
---|
| 566 |
|
---|
| 567 | /*
|
---|
| 568 | * The peer has failed to authenticate himself using `protocol'.
|
---|
| 569 | */
|
---|
| 570 | void
|
---|
| 571 | auth_peer_fail(int unit, u16_t protocol)
|
---|
| 572 | {
|
---|
| 573 | LWIP_UNUSED_ARG(protocol);
|
---|
| 574 |
|
---|
| 575 | AUTHDEBUG(LOG_INFO, ("auth_peer_fail: %d proto=%X\n", unit, protocol));
|
---|
| 576 | /*
|
---|
| 577 | * Authentication failure: take the link down
|
---|
| 578 | */
|
---|
| 579 | lcp_close(unit, "Authentication failed");
|
---|
| 580 | }
|
---|
| 581 |
|
---|
| 582 |
|
---|
| 583 | #if PAP_SUPPORT || CHAP_SUPPORT
|
---|
| 584 | /*
|
---|
| 585 | * The peer has been successfully authenticated using `protocol'.
|
---|
| 586 | */
|
---|
| 587 | void
|
---|
| 588 | auth_peer_success(int unit, u16_t protocol, char *name, int namelen)
|
---|
| 589 | {
|
---|
| 590 | int pbit;
|
---|
| 591 |
|
---|
| 592 | AUTHDEBUG(LOG_INFO, ("auth_peer_success: %d proto=%X\n", unit, protocol));
|
---|
| 593 | switch (protocol) {
|
---|
| 594 | case PPP_CHAP:
|
---|
| 595 | pbit = CHAP_PEER;
|
---|
| 596 | break;
|
---|
| 597 | case PPP_PAP:
|
---|
| 598 | pbit = PAP_PEER;
|
---|
| 599 | break;
|
---|
| 600 | default:
|
---|
| 601 | AUTHDEBUG(LOG_WARNING, ("auth_peer_success: unknown protocol %x\n", protocol));
|
---|
| 602 | return;
|
---|
| 603 | }
|
---|
| 604 |
|
---|
| 605 | /*
|
---|
| 606 | * Save the authenticated name of the peer for later.
|
---|
| 607 | */
|
---|
| 608 | if (namelen > (int)sizeof(peer_authname) - 1) {
|
---|
| 609 | namelen = sizeof(peer_authname) - 1;
|
---|
| 610 | }
|
---|
| 611 | BCOPY(name, peer_authname, namelen);
|
---|
| 612 | peer_authname[namelen] = 0;
|
---|
| 613 |
|
---|
| 614 | /*
|
---|
| 615 | * If there is no more authentication still to be done,
|
---|
| 616 | * proceed to the network (or callback) phase.
|
---|
| 617 | */
|
---|
| 618 | if ((auth_pending[unit] &= ~pbit) == 0) {
|
---|
| 619 | network_phase(unit);
|
---|
| 620 | }
|
---|
| 621 | }
|
---|
| 622 |
|
---|
| 623 | /*
|
---|
| 624 | * We have failed to authenticate ourselves to the peer using `protocol'.
|
---|
| 625 | */
|
---|
| 626 | void
|
---|
| 627 | auth_withpeer_fail(int unit, u16_t protocol)
|
---|
| 628 | {
|
---|
| 629 | int errCode = PPPERR_AUTHFAIL;
|
---|
| 630 |
|
---|
| 631 | LWIP_UNUSED_ARG(protocol);
|
---|
| 632 |
|
---|
| 633 | AUTHDEBUG(LOG_INFO, ("auth_withpeer_fail: %d proto=%X\n", unit, protocol));
|
---|
| 634 | if (passwd_from_file) {
|
---|
| 635 | BZERO(ppp_settings.passwd, MAXSECRETLEN);
|
---|
| 636 | }
|
---|
| 637 |
|
---|
| 638 | /*
|
---|
| 639 | * We've failed to authenticate ourselves to our peer.
|
---|
| 640 | * He'll probably take the link down, and there's not much
|
---|
| 641 | * we can do except wait for that.
|
---|
| 642 | */
|
---|
| 643 | pppIOCtl(unit, PPPCTLS_ERRCODE, &errCode);
|
---|
| 644 | lcp_close(unit, "Failed to authenticate ourselves to peer");
|
---|
| 645 | }
|
---|
| 646 |
|
---|
| 647 | /*
|
---|
| 648 | * We have successfully authenticated ourselves with the peer using `protocol'.
|
---|
| 649 | */
|
---|
| 650 | void
|
---|
| 651 | auth_withpeer_success(int unit, u16_t protocol)
|
---|
| 652 | {
|
---|
| 653 | int pbit;
|
---|
| 654 |
|
---|
| 655 | AUTHDEBUG(LOG_INFO, ("auth_withpeer_success: %d proto=%X\n", unit, protocol));
|
---|
| 656 | switch (protocol) {
|
---|
| 657 | case PPP_CHAP:
|
---|
| 658 | pbit = CHAP_WITHPEER;
|
---|
| 659 | break;
|
---|
| 660 | case PPP_PAP:
|
---|
| 661 | if (passwd_from_file) {
|
---|
| 662 | BZERO(ppp_settings.passwd, MAXSECRETLEN);
|
---|
| 663 | }
|
---|
| 664 | pbit = PAP_WITHPEER;
|
---|
| 665 | break;
|
---|
| 666 | default:
|
---|
| 667 | AUTHDEBUG(LOG_WARNING, ("auth_peer_success: unknown protocol %x\n", protocol));
|
---|
| 668 | pbit = 0;
|
---|
| 669 | }
|
---|
| 670 |
|
---|
| 671 | /*
|
---|
| 672 | * If there is no more authentication still being done,
|
---|
| 673 | * proceed to the network (or callback) phase.
|
---|
| 674 | */
|
---|
| 675 | if ((auth_pending[unit] &= ~pbit) == 0) {
|
---|
| 676 | network_phase(unit);
|
---|
| 677 | }
|
---|
| 678 | }
|
---|
| 679 | #endif /* PAP_SUPPORT || CHAP_SUPPORT */
|
---|
| 680 |
|
---|
| 681 |
|
---|
| 682 | /*
|
---|
| 683 | * np_up - a network protocol has come up.
|
---|
| 684 | */
|
---|
| 685 | void
|
---|
| 686 | np_up(int unit, u16_t proto)
|
---|
| 687 | {
|
---|
| 688 | LWIP_UNUSED_ARG(unit);
|
---|
| 689 | LWIP_UNUSED_ARG(proto);
|
---|
| 690 |
|
---|
| 691 | AUTHDEBUG(LOG_INFO, ("np_up: %d proto=%X\n", unit, proto));
|
---|
| 692 | if (num_np_up == 0) {
|
---|
| 693 | AUTHDEBUG(LOG_INFO, ("np_up: maxconnect=%d idle_time_limit=%d\n",ppp_settings.maxconnect,ppp_settings.idle_time_limit));
|
---|
| 694 | /*
|
---|
| 695 | * At this point we consider that the link has come up successfully.
|
---|
| 696 | */
|
---|
| 697 | if (ppp_settings.idle_time_limit > 0) {
|
---|
| 698 | TIMEOUT(check_idle, NULL, ppp_settings.idle_time_limit);
|
---|
| 699 | }
|
---|
| 700 |
|
---|
| 701 | /*
|
---|
| 702 | * Set a timeout to close the connection once the maximum
|
---|
| 703 | * connect time has expired.
|
---|
| 704 | */
|
---|
| 705 | if (ppp_settings.maxconnect > 0) {
|
---|
| 706 | TIMEOUT(connect_time_expired, 0, ppp_settings.maxconnect);
|
---|
| 707 | }
|
---|
| 708 | }
|
---|
| 709 | ++num_np_up;
|
---|
| 710 | }
|
---|
| 711 |
|
---|
| 712 | /*
|
---|
| 713 | * np_down - a network protocol has gone down.
|
---|
| 714 | */
|
---|
| 715 | void
|
---|
| 716 | np_down(int unit, u16_t proto)
|
---|
| 717 | {
|
---|
| 718 | LWIP_UNUSED_ARG(unit);
|
---|
| 719 | LWIP_UNUSED_ARG(proto);
|
---|
| 720 |
|
---|
| 721 | AUTHDEBUG(LOG_INFO, ("np_down: %d proto=%X\n", unit, proto));
|
---|
| 722 | if (--num_np_up == 0 && ppp_settings.idle_time_limit > 0) {
|
---|
| 723 | UNTIMEOUT(check_idle, NULL);
|
---|
| 724 | }
|
---|
| 725 | }
|
---|
| 726 |
|
---|
| 727 | /*
|
---|
| 728 | * np_finished - a network protocol has finished using the link.
|
---|
| 729 | */
|
---|
| 730 | void
|
---|
| 731 | np_finished(int unit, u16_t proto)
|
---|
| 732 | {
|
---|
| 733 | LWIP_UNUSED_ARG(unit);
|
---|
| 734 | LWIP_UNUSED_ARG(proto);
|
---|
| 735 |
|
---|
| 736 | AUTHDEBUG(LOG_INFO, ("np_finished: %d proto=%X\n", unit, proto));
|
---|
| 737 | if (--num_np_open <= 0) {
|
---|
| 738 | /* no further use for the link: shut up shop. */
|
---|
| 739 | lcp_close(0, "No network protocols running");
|
---|
| 740 | }
|
---|
| 741 | }
|
---|
| 742 |
|
---|
| 743 | /*
|
---|
| 744 | * check_idle - check whether the link has been idle for long
|
---|
| 745 | * enough that we can shut it down.
|
---|
| 746 | */
|
---|
| 747 | static void
|
---|
| 748 | check_idle(void *arg)
|
---|
| 749 | {
|
---|
| 750 | struct ppp_idle idle;
|
---|
| 751 | u_short itime;
|
---|
| 752 |
|
---|
| 753 | LWIP_UNUSED_ARG(arg);
|
---|
| 754 | if (!get_idle_time(0, &idle)) {
|
---|
| 755 | return;
|
---|
| 756 | }
|
---|
| 757 | itime = LWIP_MIN(idle.xmit_idle, idle.recv_idle);
|
---|
| 758 | if (itime >= ppp_settings.idle_time_limit) {
|
---|
| 759 | /* link is idle: shut it down. */
|
---|
| 760 | AUTHDEBUG(LOG_INFO, ("Terminating connection due to lack of activity.\n"));
|
---|
| 761 | lcp_close(0, "Link inactive");
|
---|
| 762 | } else {
|
---|
| 763 | TIMEOUT(check_idle, NULL, ppp_settings.idle_time_limit - itime);
|
---|
| 764 | }
|
---|
| 765 | }
|
---|
| 766 |
|
---|
| 767 | /*
|
---|
| 768 | * connect_time_expired - log a message and close the connection.
|
---|
| 769 | */
|
---|
| 770 | static void
|
---|
| 771 | connect_time_expired(void *arg)
|
---|
| 772 | {
|
---|
| 773 | LWIP_UNUSED_ARG(arg);
|
---|
| 774 |
|
---|
| 775 | AUTHDEBUG(LOG_INFO, ("Connect time expired\n"));
|
---|
| 776 | lcp_close(0, "Connect time expired"); /* Close connection */
|
---|
| 777 | }
|
---|
| 778 |
|
---|
| 779 | #if 0 /* UNUSED */
|
---|
| 780 | /*
|
---|
| 781 | * auth_check_options - called to check authentication options.
|
---|
| 782 | */
|
---|
| 783 | void
|
---|
| 784 | auth_check_options(void)
|
---|
| 785 | {
|
---|
| 786 | lcp_options *wo = &lcp_wantoptions[0];
|
---|
| 787 | int can_auth;
|
---|
| 788 | ipcp_options *ipwo = &ipcp_wantoptions[0];
|
---|
| 789 | u32_t remote;
|
---|
| 790 |
|
---|
| 791 | /* Default our_name to hostname, and user to our_name */
|
---|
| 792 | if (ppp_settings.our_name[0] == 0 || ppp_settings.usehostname) {
|
---|
| 793 | strcpy(ppp_settings.our_name, ppp_settings.hostname);
|
---|
| 794 | }
|
---|
| 795 |
|
---|
| 796 | if (ppp_settings.user[0] == 0) {
|
---|
| 797 | strcpy(ppp_settings.user, ppp_settings.our_name);
|
---|
| 798 | }
|
---|
| 799 |
|
---|
| 800 | /* If authentication is required, ask peer for CHAP or PAP. */
|
---|
| 801 | if (ppp_settings.auth_required && !wo->neg_chap && !wo->neg_upap) {
|
---|
| 802 | wo->neg_chap = 1;
|
---|
| 803 | wo->neg_upap = 1;
|
---|
| 804 | }
|
---|
| 805 |
|
---|
| 806 | /*
|
---|
| 807 | * Check whether we have appropriate secrets to use
|
---|
| 808 | * to authenticate the peer.
|
---|
| 809 | */
|
---|
| 810 | can_auth = wo->neg_upap && have_pap_secret();
|
---|
| 811 | if (!can_auth && wo->neg_chap) {
|
---|
| 812 | remote = ipwo->accept_remote? 0: ipwo->hisaddr;
|
---|
| 813 | can_auth = have_chap_secret(ppp_settings.remote_name, ppp_settings.our_name, remote);
|
---|
| 814 | }
|
---|
| 815 |
|
---|
| 816 | if (ppp_settings.auth_required && !can_auth) {
|
---|
| 817 | ppp_panic("No auth secret");
|
---|
| 818 | }
|
---|
| 819 | }
|
---|
| 820 | #endif /* UNUSED */
|
---|
| 821 |
|
---|
| 822 | /*
|
---|
| 823 | * auth_reset - called when LCP is starting negotiations to recheck
|
---|
| 824 | * authentication options, i.e. whether we have appropriate secrets
|
---|
| 825 | * to use for authenticating ourselves and/or the peer.
|
---|
| 826 | */
|
---|
| 827 | void
|
---|
| 828 | auth_reset(int unit)
|
---|
| 829 | {
|
---|
| 830 | lcp_options *go = &lcp_gotoptions[unit];
|
---|
| 831 | lcp_options *ao = &lcp_allowoptions[0];
|
---|
| 832 | ipcp_options *ipwo = &ipcp_wantoptions[0];
|
---|
| 833 | u32_t remote;
|
---|
| 834 |
|
---|
| 835 | AUTHDEBUG(LOG_INFO, ("auth_reset: %d\n", unit));
|
---|
| 836 | ao->neg_upap = !ppp_settings.refuse_pap && (ppp_settings.passwd[0] != 0 || get_pap_passwd(unit, NULL, NULL));
|
---|
| 837 | ao->neg_chap = !ppp_settings.refuse_chap && ppp_settings.passwd[0] != 0 /*have_chap_secret(ppp_settings.user, ppp_settings.remote_name, (u32_t)0)*/;
|
---|
| 838 |
|
---|
| 839 | if (go->neg_upap && !have_pap_secret()) {
|
---|
| 840 | go->neg_upap = 0;
|
---|
| 841 | }
|
---|
| 842 | if (go->neg_chap) {
|
---|
| 843 | remote = ipwo->accept_remote? 0: ipwo->hisaddr;
|
---|
| 844 | if (!have_chap_secret(ppp_settings.remote_name, ppp_settings.our_name, remote)) {
|
---|
| 845 | go->neg_chap = 0;
|
---|
| 846 | }
|
---|
| 847 | }
|
---|
| 848 | }
|
---|
| 849 |
|
---|
| 850 | #if PAP_SUPPORT
|
---|
| 851 | /*
|
---|
| 852 | * check_passwd - Check the user name and passwd against the PAP secrets
|
---|
| 853 | * file. If requested, also check against the system password database,
|
---|
| 854 | * and login the user if OK.
|
---|
| 855 | *
|
---|
| 856 | * returns:
|
---|
| 857 | * UPAP_AUTHNAK: Authentication failed.
|
---|
| 858 | * UPAP_AUTHACK: Authentication succeeded.
|
---|
| 859 | * In either case, msg points to an appropriate message.
|
---|
| 860 | */
|
---|
| 861 | u_char
|
---|
| 862 | check_passwd( int unit, char *auser, int userlen, char *apasswd, int passwdlen, char **msg, int *msglen)
|
---|
| 863 | {
|
---|
| 864 | #if 1 /* XXX Assume all entries OK. */
|
---|
| 865 | LWIP_UNUSED_ARG(unit);
|
---|
| 866 | LWIP_UNUSED_ARG(auser);
|
---|
| 867 | LWIP_UNUSED_ARG(userlen);
|
---|
| 868 | LWIP_UNUSED_ARG(apasswd);
|
---|
| 869 | LWIP_UNUSED_ARG(passwdlen);
|
---|
| 870 | LWIP_UNUSED_ARG(msglen);
|
---|
| 871 | *msg = (char *) 0;
|
---|
| 872 | return UPAP_AUTHACK; /* XXX Assume all entries OK. */
|
---|
| 873 | #else
|
---|
| 874 | u_char ret = 0;
|
---|
| 875 | struct wordlist *addrs = NULL;
|
---|
| 876 | char passwd[256], user[256];
|
---|
| 877 | char secret[MAXWORDLEN];
|
---|
| 878 | static u_short attempts = 0;
|
---|
| 879 |
|
---|
| 880 | /*
|
---|
| 881 | * Make copies of apasswd and auser, then null-terminate them.
|
---|
| 882 | */
|
---|
| 883 | BCOPY(apasswd, passwd, passwdlen);
|
---|
| 884 | passwd[passwdlen] = '\0';
|
---|
| 885 | BCOPY(auser, user, userlen);
|
---|
| 886 | user[userlen] = '\0';
|
---|
| 887 | *msg = (char *) 0;
|
---|
| 888 |
|
---|
| 889 | /* XXX Validate user name and password. */
|
---|
| 890 | ret = UPAP_AUTHACK; /* XXX Assume all entries OK. */
|
---|
| 891 |
|
---|
| 892 | if (ret == UPAP_AUTHNAK) {
|
---|
| 893 | if (*msg == (char *) 0) {
|
---|
| 894 | *msg = "Login incorrect";
|
---|
| 895 | }
|
---|
| 896 | *msglen = strlen(*msg);
|
---|
| 897 | /*
|
---|
| 898 | * Frustrate passwd stealer programs.
|
---|
| 899 | * Allow 10 tries, but start backing off after 3 (stolen from login).
|
---|
| 900 | * On 10'th, drop the connection.
|
---|
| 901 | */
|
---|
| 902 | if (attempts++ >= 10) {
|
---|
| 903 | AUTHDEBUG(LOG_WARNING, ("%d LOGIN FAILURES BY %s\n", attempts, user));
|
---|
| 904 | /*ppp_panic("Excess Bad Logins");*/
|
---|
| 905 | }
|
---|
| 906 | if (attempts > 3) {
|
---|
| 907 | /* @todo: this was sleep(), i.e. seconds, not milliseconds
|
---|
| 908 | * I don't think we really need this in lwIP - we would block tcpip_thread!
|
---|
| 909 | */
|
---|
| 910 | /*sys_msleep((attempts - 3) * 5);*/
|
---|
| 911 | }
|
---|
| 912 | if (addrs != NULL) {
|
---|
| 913 | free_wordlist(addrs);
|
---|
| 914 | }
|
---|
| 915 | } else {
|
---|
| 916 | attempts = 0; /* Reset count */
|
---|
| 917 | if (*msg == (char *) 0) {
|
---|
| 918 | *msg = "Login ok";
|
---|
| 919 | }
|
---|
| 920 | *msglen = strlen(*msg);
|
---|
| 921 | set_allowed_addrs(unit, addrs);
|
---|
| 922 | }
|
---|
| 923 |
|
---|
| 924 | BZERO(passwd, sizeof(passwd));
|
---|
| 925 | BZERO(secret, sizeof(secret));
|
---|
| 926 |
|
---|
| 927 | return ret;
|
---|
| 928 | #endif
|
---|
| 929 | }
|
---|
| 930 | #endif /* PAP_SUPPORT */
|
---|
| 931 |
|
---|
| 932 | #if 0 /* UNUSED */
|
---|
| 933 | /*
|
---|
| 934 | * This function is needed for PAM.
|
---|
| 935 | */
|
---|
| 936 |
|
---|
| 937 | #ifdef USE_PAM
|
---|
| 938 |
|
---|
| 939 | /* lwip does not support PAM*/
|
---|
| 940 |
|
---|
| 941 | #endif /* USE_PAM */
|
---|
| 942 |
|
---|
| 943 | #endif /* UNUSED */
|
---|
| 944 |
|
---|
| 945 |
|
---|
| 946 | #if 0 /* UNUSED */
|
---|
| 947 | /*
|
---|
| 948 | * plogin - Check the user name and password against the system
|
---|
| 949 | * password database, and login the user if OK.
|
---|
| 950 | *
|
---|
| 951 | * returns:
|
---|
| 952 | * UPAP_AUTHNAK: Login failed.
|
---|
| 953 | * UPAP_AUTHACK: Login succeeded.
|
---|
| 954 | * In either case, msg points to an appropriate message.
|
---|
| 955 | */
|
---|
| 956 | static int
|
---|
| 957 | plogin(char *user, char *passwd, char **msg, int *msglen)
|
---|
| 958 | {
|
---|
| 959 |
|
---|
| 960 | LWIP_UNUSED_ARG(user);
|
---|
| 961 | LWIP_UNUSED_ARG(passwd);
|
---|
| 962 | LWIP_UNUSED_ARG(msg);
|
---|
| 963 | LWIP_UNUSED_ARG(msglen);
|
---|
| 964 |
|
---|
| 965 |
|
---|
| 966 | /* The new lines are here align the file when
|
---|
| 967 | * compared against the pppd 2.3.11 code */
|
---|
| 968 |
|
---|
| 969 |
|
---|
| 970 |
|
---|
| 971 |
|
---|
| 972 |
|
---|
| 973 |
|
---|
| 974 |
|
---|
| 975 |
|
---|
| 976 |
|
---|
| 977 |
|
---|
| 978 |
|
---|
| 979 |
|
---|
| 980 |
|
---|
| 981 |
|
---|
| 982 |
|
---|
| 983 |
|
---|
| 984 | /* XXX Fail until we decide that we want to support logins. */
|
---|
| 985 | return (UPAP_AUTHNAK);
|
---|
| 986 | }
|
---|
| 987 | #endif
|
---|
| 988 |
|
---|
| 989 |
|
---|
| 990 |
|
---|
| 991 | /*
|
---|
| 992 | * plogout - Logout the user.
|
---|
| 993 | */
|
---|
| 994 | static void
|
---|
| 995 | plogout(void)
|
---|
| 996 | {
|
---|
| 997 | logged_in = 0;
|
---|
| 998 | }
|
---|
| 999 |
|
---|
| 1000 | /*
|
---|
| 1001 | * null_login - Check if a username of "" and a password of "" are
|
---|
| 1002 | * acceptable, and iff so, set the list of acceptable IP addresses
|
---|
| 1003 | * and return 1.
|
---|
| 1004 | */
|
---|
| 1005 | static int
|
---|
| 1006 | null_login(int unit)
|
---|
| 1007 | {
|
---|
| 1008 | LWIP_UNUSED_ARG(unit);
|
---|
| 1009 | /* XXX Fail until we decide that we want to support logins. */
|
---|
| 1010 | return 0;
|
---|
| 1011 | }
|
---|
| 1012 |
|
---|
| 1013 |
|
---|
| 1014 | /*
|
---|
| 1015 | * get_pap_passwd - get a password for authenticating ourselves with
|
---|
| 1016 | * our peer using PAP. Returns 1 on success, 0 if no suitable password
|
---|
| 1017 | * could be found.
|
---|
| 1018 | */
|
---|
| 1019 | static int
|
---|
| 1020 | get_pap_passwd(int unit, char *user, char *passwd)
|
---|
| 1021 | {
|
---|
| 1022 | LWIP_UNUSED_ARG(unit);
|
---|
| 1023 | /* normally we would reject PAP if no password is provided,
|
---|
| 1024 | but this causes problems with some providers (like CHT in Taiwan)
|
---|
| 1025 | who incorrectly request PAP and expect a bogus/empty password, so
|
---|
| 1026 | always provide a default user/passwd of "none"/"none"
|
---|
| 1027 |
|
---|
| 1028 | @todo: This should be configured by the user, instead of being hardcoded here!
|
---|
| 1029 | */
|
---|
| 1030 | if(user) {
|
---|
| 1031 | strcpy(user, "none");
|
---|
| 1032 | }
|
---|
| 1033 | if(passwd) {
|
---|
| 1034 | strcpy(passwd, "none");
|
---|
| 1035 | }
|
---|
| 1036 | return 1;
|
---|
| 1037 | }
|
---|
| 1038 |
|
---|
| 1039 | /*
|
---|
| 1040 | * have_pap_secret - check whether we have a PAP file with any
|
---|
| 1041 | * secrets that we could possibly use for authenticating the peer.
|
---|
| 1042 | */
|
---|
| 1043 | static int
|
---|
| 1044 | have_pap_secret(void)
|
---|
| 1045 | {
|
---|
| 1046 | /* XXX Fail until we set up our passwords. */
|
---|
| 1047 | return 0;
|
---|
| 1048 | }
|
---|
| 1049 |
|
---|
| 1050 | /*
|
---|
| 1051 | * have_chap_secret - check whether we have a CHAP file with a
|
---|
| 1052 | * secret that we could possibly use for authenticating `client'
|
---|
| 1053 | * on `server'. Either can be the null string, meaning we don't
|
---|
| 1054 | * know the identity yet.
|
---|
| 1055 | */
|
---|
| 1056 | static int
|
---|
| 1057 | have_chap_secret(char *client, char *server, u32_t remote)
|
---|
| 1058 | {
|
---|
| 1059 | LWIP_UNUSED_ARG(client);
|
---|
| 1060 | LWIP_UNUSED_ARG(server);
|
---|
| 1061 | LWIP_UNUSED_ARG(remote);
|
---|
| 1062 |
|
---|
| 1063 | /* XXX Fail until we set up our passwords. */
|
---|
| 1064 | return 0;
|
---|
| 1065 | }
|
---|
| 1066 | #if CHAP_SUPPORT
|
---|
| 1067 |
|
---|
| 1068 | /*
|
---|
| 1069 | * get_secret - open the CHAP secret file and return the secret
|
---|
| 1070 | * for authenticating the given client on the given server.
|
---|
| 1071 | * (We could be either client or server).
|
---|
| 1072 | */
|
---|
| 1073 | int
|
---|
| 1074 | get_secret(int unit, char *client, char *server, char *secret, int *secret_len, int save_addrs)
|
---|
| 1075 | {
|
---|
| 1076 | #if 1
|
---|
| 1077 | int len;
|
---|
| 1078 | struct wordlist *addrs;
|
---|
| 1079 |
|
---|
| 1080 | LWIP_UNUSED_ARG(unit);
|
---|
| 1081 | LWIP_UNUSED_ARG(server);
|
---|
| 1082 | LWIP_UNUSED_ARG(save_addrs);
|
---|
| 1083 |
|
---|
| 1084 | addrs = NULL;
|
---|
| 1085 |
|
---|
| 1086 | if(!client || !client[0] || strcmp(client, ppp_settings.user)) {
|
---|
| 1087 | return 0;
|
---|
| 1088 | }
|
---|
| 1089 |
|
---|
| 1090 | len = (int)strlen(ppp_settings.passwd);
|
---|
| 1091 | if (len > MAXSECRETLEN) {
|
---|
| 1092 | AUTHDEBUG(LOG_ERR, ("Secret for %s on %s is too long\n", client, server));
|
---|
| 1093 | len = MAXSECRETLEN;
|
---|
| 1094 | }
|
---|
| 1095 |
|
---|
| 1096 | BCOPY(ppp_settings.passwd, secret, len);
|
---|
| 1097 | *secret_len = len;
|
---|
| 1098 |
|
---|
| 1099 | return 1;
|
---|
| 1100 | #else
|
---|
| 1101 | int ret = 0, len;
|
---|
| 1102 | struct wordlist *addrs;
|
---|
| 1103 | char secbuf[MAXWORDLEN];
|
---|
| 1104 |
|
---|
| 1105 | addrs = NULL;
|
---|
| 1106 | secbuf[0] = 0;
|
---|
| 1107 |
|
---|
| 1108 | /* XXX Find secret. */
|
---|
| 1109 | if (ret < 0) {
|
---|
| 1110 | return 0;
|
---|
| 1111 | }
|
---|
| 1112 |
|
---|
| 1113 | if (save_addrs) {
|
---|
| 1114 | set_allowed_addrs(unit, addrs);
|
---|
| 1115 | }
|
---|
| 1116 |
|
---|
| 1117 | len = strlen(secbuf);
|
---|
| 1118 | if (len > MAXSECRETLEN) {
|
---|
| 1119 | AUTHDEBUG(LOG_ERR, ("Secret for %s on %s is too long\n", client, server));
|
---|
| 1120 | len = MAXSECRETLEN;
|
---|
| 1121 | }
|
---|
| 1122 |
|
---|
| 1123 | BCOPY(secbuf, secret, len);
|
---|
| 1124 | BZERO(secbuf, sizeof(secbuf));
|
---|
| 1125 | *secret_len = len;
|
---|
| 1126 |
|
---|
| 1127 | return 1;
|
---|
| 1128 | #endif
|
---|
| 1129 | }
|
---|
| 1130 | #endif /* CHAP_SUPPORT */
|
---|
| 1131 |
|
---|
| 1132 |
|
---|
| 1133 | #if 0 /* PAP_SUPPORT || CHAP_SUPPORT */
|
---|
| 1134 | /*
|
---|
| 1135 | * set_allowed_addrs() - set the list of allowed addresses.
|
---|
| 1136 | */
|
---|
| 1137 | static void
|
---|
| 1138 | set_allowed_addrs(int unit, struct wordlist *addrs)
|
---|
| 1139 | {
|
---|
| 1140 | if (addresses[unit] != NULL) {
|
---|
| 1141 | free_wordlist(addresses[unit]);
|
---|
| 1142 | }
|
---|
| 1143 | addresses[unit] = addrs;
|
---|
| 1144 |
|
---|
| 1145 | #if 0
|
---|
| 1146 | /*
|
---|
| 1147 | * If there's only one authorized address we might as well
|
---|
| 1148 | * ask our peer for that one right away
|
---|
| 1149 | */
|
---|
| 1150 | if (addrs != NULL && addrs->next == NULL) {
|
---|
| 1151 | char *p = addrs->word;
|
---|
| 1152 | struct ipcp_options *wo = &ipcp_wantoptions[unit];
|
---|
| 1153 | u32_t a;
|
---|
| 1154 | struct hostent *hp;
|
---|
| 1155 |
|
---|
| 1156 | if (wo->hisaddr == 0 && *p != '!' && *p != '-' && strchr(p, '/') == NULL) {
|
---|
| 1157 | hp = gethostbyname(p);
|
---|
| 1158 | if (hp != NULL && hp->h_addrtype == AF_INET) {
|
---|
| 1159 | a = *(u32_t *)hp->h_addr;
|
---|
| 1160 | } else {
|
---|
| 1161 | a = inet_addr(p);
|
---|
| 1162 | }
|
---|
| 1163 | if (a != (u32_t) -1) {
|
---|
| 1164 | wo->hisaddr = a;
|
---|
| 1165 | }
|
---|
| 1166 | }
|
---|
| 1167 | }
|
---|
| 1168 | #endif
|
---|
| 1169 | }
|
---|
| 1170 | #endif /* 0 */ /* PAP_SUPPORT || CHAP_SUPPORT */
|
---|
| 1171 |
|
---|
| 1172 | /*
|
---|
| 1173 | * auth_ip_addr - check whether the peer is authorized to use
|
---|
| 1174 | * a given IP address. Returns 1 if authorized, 0 otherwise.
|
---|
| 1175 | */
|
---|
| 1176 | int
|
---|
| 1177 | auth_ip_addr(int unit, u32_t addr)
|
---|
| 1178 | {
|
---|
| 1179 | return ip_addr_check(addr, addresses[unit]);
|
---|
| 1180 | }
|
---|
| 1181 |
|
---|
| 1182 | static int /* @todo: integrate this funtion into auth_ip_addr()*/
|
---|
| 1183 | ip_addr_check(u32_t addr, struct wordlist *addrs)
|
---|
| 1184 | {
|
---|
| 1185 | /* don't allow loopback or multicast address */
|
---|
| 1186 | if (bad_ip_adrs(addr)) {
|
---|
| 1187 | return 0;
|
---|
| 1188 | }
|
---|
| 1189 |
|
---|
| 1190 | if (addrs == NULL) {
|
---|
| 1191 | return !ppp_settings.auth_required; /* no addresses authorized */
|
---|
| 1192 | }
|
---|
| 1193 |
|
---|
| 1194 | /* XXX All other addresses allowed. */
|
---|
| 1195 | return 1;
|
---|
| 1196 | }
|
---|
| 1197 |
|
---|
| 1198 | /*
|
---|
| 1199 | * bad_ip_adrs - return 1 if the IP address is one we don't want
|
---|
| 1200 | * to use, such as an address in the loopback net or a multicast address.
|
---|
| 1201 | * addr is in network byte order.
|
---|
| 1202 | */
|
---|
| 1203 | int
|
---|
| 1204 | bad_ip_adrs(u32_t addr)
|
---|
| 1205 | {
|
---|
| 1206 | addr = ntohl(addr);
|
---|
| 1207 | return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
|
---|
| 1208 | || IN_MULTICAST(addr) || IN_BADCLASS(addr);
|
---|
| 1209 | }
|
---|
| 1210 |
|
---|
| 1211 | #if 0 /* UNUSED */ /* PAP_SUPPORT || CHAP_SUPPORT */
|
---|
| 1212 | /*
|
---|
| 1213 | * some_ip_ok - check a wordlist to see if it authorizes any
|
---|
| 1214 | * IP address(es).
|
---|
| 1215 | */
|
---|
| 1216 | static int
|
---|
| 1217 | some_ip_ok(struct wordlist *addrs)
|
---|
| 1218 | {
|
---|
| 1219 | for (; addrs != 0; addrs = addrs->next) {
|
---|
| 1220 | if (addrs->word[0] == '-')
|
---|
| 1221 | break;
|
---|
| 1222 | if (addrs->word[0] != '!')
|
---|
| 1223 | return 1; /* some IP address is allowed */
|
---|
| 1224 | }
|
---|
| 1225 | return 0;
|
---|
| 1226 | }
|
---|
| 1227 |
|
---|
| 1228 | /*
|
---|
| 1229 | * check_access - complain if a secret file has too-liberal permissions.
|
---|
| 1230 | */
|
---|
| 1231 | static void
|
---|
| 1232 | check_access(FILE *f, char *filename)
|
---|
| 1233 | {
|
---|
| 1234 | struct stat sbuf;
|
---|
| 1235 |
|
---|
| 1236 | if (fstat(fileno(f), &sbuf) < 0) {
|
---|
| 1237 | warn("cannot stat secret file %s: %m", filename);
|
---|
| 1238 | } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
|
---|
| 1239 | warn("Warning - secret file %s has world and/or group access",
|
---|
| 1240 | filename);
|
---|
| 1241 | }
|
---|
| 1242 | }
|
---|
| 1243 |
|
---|
| 1244 |
|
---|
| 1245 | /*
|
---|
| 1246 | * scan_authfile - Scan an authorization file for a secret suitable
|
---|
| 1247 | * for authenticating `client' on `server'. The return value is -1
|
---|
| 1248 | * if no secret is found, otherwise >= 0. The return value has
|
---|
| 1249 | * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
|
---|
| 1250 | * NONWILD_SERVER set if the secret didn't have "*" for the server.
|
---|
| 1251 | * Any following words on the line up to a "--" (i.e. address authorization
|
---|
| 1252 | * info) are placed in a wordlist and returned in *addrs. Any
|
---|
| 1253 | * following words (extra options) are placed in a wordlist and
|
---|
| 1254 | * returned in *opts.
|
---|
| 1255 | * We assume secret is NULL or points to MAXWORDLEN bytes of space.
|
---|
| 1256 | */
|
---|
| 1257 | static int
|
---|
| 1258 | scan_authfile(FILE *f, char *client, char *server, char *secret, struct wordlist **addrs, struct wordlist **opts, char *filename)
|
---|
| 1259 | {
|
---|
| 1260 | /* We do not (currently) need this in lwip */
|
---|
| 1261 | return 0; /* dummy */
|
---|
| 1262 | }
|
---|
| 1263 | /*
|
---|
| 1264 | * free_wordlist - release memory allocated for a wordlist.
|
---|
| 1265 | */
|
---|
| 1266 | static void
|
---|
| 1267 | free_wordlist(struct wordlist *wp)
|
---|
| 1268 | {
|
---|
| 1269 | struct wordlist *next;
|
---|
| 1270 |
|
---|
| 1271 | while (wp != NULL) {
|
---|
| 1272 | next = wp->next;
|
---|
| 1273 | free(wp);
|
---|
| 1274 | wp = next;
|
---|
| 1275 | }
|
---|
| 1276 | }
|
---|
| 1277 |
|
---|
| 1278 | /*
|
---|
| 1279 | * auth_script_done - called when the auth-up or auth-down script
|
---|
| 1280 | * has finished.
|
---|
| 1281 | */
|
---|
| 1282 | static void
|
---|
| 1283 | auth_script_done(void *arg)
|
---|
| 1284 | {
|
---|
| 1285 | auth_script_pid = 0;
|
---|
| 1286 | switch (auth_script_state) {
|
---|
| 1287 | case s_up:
|
---|
| 1288 | if (auth_state == s_down) {
|
---|
| 1289 | auth_script_state = s_down;
|
---|
| 1290 | auth_script(_PATH_AUTHDOWN);
|
---|
| 1291 | }
|
---|
| 1292 | break;
|
---|
| 1293 | case s_down:
|
---|
| 1294 | if (auth_state == s_up) {
|
---|
| 1295 | auth_script_state = s_up;
|
---|
| 1296 | auth_script(_PATH_AUTHUP);
|
---|
| 1297 | }
|
---|
| 1298 | break;
|
---|
| 1299 | }
|
---|
| 1300 | }
|
---|
| 1301 |
|
---|
| 1302 | /*
|
---|
| 1303 | * auth_script - execute a script with arguments
|
---|
| 1304 | * interface-name peer-name real-user tty speed
|
---|
| 1305 | */
|
---|
| 1306 | static void
|
---|
| 1307 | auth_script(char *script)
|
---|
| 1308 | {
|
---|
| 1309 | char strspeed[32];
|
---|
| 1310 | struct passwd *pw;
|
---|
| 1311 | char struid[32];
|
---|
| 1312 | char *user_name;
|
---|
| 1313 | char *argv[8];
|
---|
| 1314 |
|
---|
| 1315 | if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
|
---|
| 1316 | user_name = pw->pw_name;
|
---|
| 1317 | else {
|
---|
| 1318 | slprintf(struid, sizeof(struid), "%d", getuid());
|
---|
| 1319 | user_name = struid;
|
---|
| 1320 | }
|
---|
| 1321 | slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
|
---|
| 1322 |
|
---|
| 1323 | argv[0] = script;
|
---|
| 1324 | argv[1] = ifname;
|
---|
| 1325 | argv[2] = peer_authname;
|
---|
| 1326 | argv[3] = user_name;
|
---|
| 1327 | argv[4] = devnam;
|
---|
| 1328 | argv[5] = strspeed;
|
---|
| 1329 | argv[6] = NULL;
|
---|
| 1330 |
|
---|
| 1331 | auth_script_pid = run_program(script, argv, 0, auth_script_done, NULL);
|
---|
| 1332 | }
|
---|
| 1333 | #endif /* 0 */ /* PAP_SUPPORT || CHAP_SUPPORT */
|
---|
| 1334 | #endif /* PPP_SUPPORT */
|
---|