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) {
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419 | if (!protp->enabled_flag) {
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420 | continue;
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421 | }
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422 | if (protp->protocol != PPP_LCP && protp->lowerdown != NULL) {
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423 | (*protp->lowerdown)(unit);
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424 | }
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425 | if (protp->protocol < 0xC000 && protp->close != NULL) {
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426 | (*protp->close)(unit, "LCP down");
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427 | }
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428 | }
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429 | num_np_open = 0; /* number of network protocols we have opened */
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430 | num_np_up = 0; /* Number of network protocols which have come up */
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431 |
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432 | if (lcp_phase[unit] != PHASE_DEAD) {
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433 | lcp_phase[unit] = PHASE_TERMINATE;
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434 | }
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435 | pppLinkDown(unit);
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436 | }
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437 |
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438 | /*
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439 | * The link is established.
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440 | * Proceed to the Dead, Authenticate or Network phase as appropriate.
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441 | */
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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 */
|
---|