1 | /* |
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2 | * upap.c - User/Password Authentication Protocol. |
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3 | * |
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4 | * Copyright (c) 1989 Carnegie Mellon University. |
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5 | * All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms are permitted |
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8 | * provided that the above copyright notice and this paragraph are |
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9 | * duplicated in all such forms and that any documentation, |
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10 | * advertising materials, and other materials related to such |
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11 | * distribution and use acknowledge that the software was developed |
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12 | * by Carnegie Mellon University. The name of the |
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13 | * University may not be used to endorse or promote products derived |
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14 | * from this software without specific prior written permission. |
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15 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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16 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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17 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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18 | */ |
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19 | |
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20 | #define RCSID "$Id$" |
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21 | |
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22 | /* |
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23 | * TODO: |
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24 | */ |
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25 | |
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26 | #include <stdio.h> |
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27 | #include <string.h> |
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28 | |
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29 | #include "pppd.h" |
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30 | #include "upap.h" |
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31 | |
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32 | static const char rcsid[] = RCSID; |
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33 | |
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34 | static bool hide_password = 1; |
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35 | |
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36 | /* |
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37 | * Command-line options. |
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38 | */ |
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39 | static option_t pap_option_list[] = { |
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40 | { "hide-password", o_bool, &hide_password, |
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41 | "Don't output passwords to log", 1 }, |
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42 | { "show-password", o_bool, &hide_password, |
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43 | "Show password string in debug log messages", 0 }, |
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44 | { "pap-restart", o_int, &upap[0].us_timeouttime, |
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45 | "Set retransmit timeout for PAP" }, |
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46 | { "pap-max-authreq", o_int, &upap[0].us_maxtransmits, |
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47 | "Set max number of transmissions for auth-reqs" }, |
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48 | { "pap-timeout", o_int, &upap[0].us_reqtimeout, |
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49 | "Set time limit for peer PAP authentication" }, |
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50 | { NULL } |
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51 | }; |
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52 | |
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53 | /* |
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54 | * Protocol entry points. |
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55 | */ |
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56 | static void upap_init __P((int)); |
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57 | static void upap_lowerup __P((int)); |
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58 | static void upap_lowerdown __P((int)); |
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59 | static void upap_input __P((int, u_char *, int)); |
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60 | static void upap_protrej __P((int)); |
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61 | static int upap_printpkt __P((u_char *, int, |
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62 | void (*) __P((void *, char *, ...)), void *)); |
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63 | |
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64 | struct protent pap_protent = { |
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65 | PPP_PAP, |
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66 | upap_init, |
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67 | upap_input, |
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68 | upap_protrej, |
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69 | upap_lowerup, |
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70 | upap_lowerdown, |
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71 | NULL, |
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72 | NULL, |
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73 | upap_printpkt, |
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74 | NULL, |
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75 | 1, |
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76 | "PAP", |
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77 | NULL, |
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78 | pap_option_list, |
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79 | NULL, |
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80 | NULL, |
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81 | NULL |
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82 | }; |
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83 | |
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84 | upap_state upap[NUM_PPP]; /* UPAP state; one for each unit */ |
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85 | |
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86 | static void upap_timeout __P((void *)); |
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87 | static void upap_reqtimeout __P((void *)); |
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88 | static void upap_rauthreq __P((upap_state *, u_char *, int, int)); |
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89 | static void upap_rauthack __P((upap_state *, u_char *, int, int)); |
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90 | static void upap_rauthnak __P((upap_state *, u_char *, int, int)); |
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91 | static void upap_sauthreq __P((upap_state *)); |
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92 | static void upap_sresp __P((upap_state *, u_char, u_char, char *, int)); |
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93 | |
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94 | |
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95 | /* |
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96 | * upap_init - Initialize a UPAP unit. |
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97 | */ |
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98 | static void |
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99 | upap_init(unit) |
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100 | int unit; |
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101 | { |
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102 | upap_state *u = &upap[unit]; |
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103 | |
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104 | u->us_unit = unit; |
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105 | u->us_user = NULL; |
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106 | u->us_userlen = 0; |
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107 | u->us_passwd = NULL; |
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108 | u->us_passwdlen = 0; |
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109 | u->us_clientstate = UPAPCS_INITIAL; |
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110 | u->us_serverstate = UPAPSS_INITIAL; |
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111 | u->us_id = 0; |
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112 | u->us_timeouttime = UPAP_DEFTIMEOUT; |
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113 | u->us_maxtransmits = 10; |
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114 | u->us_reqtimeout = UPAP_DEFREQTIME; |
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115 | } |
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116 | |
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117 | |
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118 | /* |
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119 | * upap_authwithpeer - Authenticate us with our peer (start client). |
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120 | * |
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121 | * Set new state and send authenticate's. |
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122 | */ |
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123 | void |
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124 | upap_authwithpeer(unit, user, password) |
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125 | int unit; |
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126 | char *user, *password; |
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127 | { |
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128 | upap_state *u = &upap[unit]; |
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129 | |
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130 | /* Save the username and password we're given */ |
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131 | u->us_user = user; |
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132 | u->us_userlen = strlen(user); |
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133 | u->us_passwd = password; |
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134 | u->us_passwdlen = strlen(password); |
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135 | u->us_transmits = 0; |
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136 | |
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137 | /* Lower layer up yet? */ |
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138 | if (u->us_clientstate == UPAPCS_INITIAL || |
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139 | u->us_clientstate == UPAPCS_PENDING) { |
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140 | u->us_clientstate = UPAPCS_PENDING; |
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141 | return; |
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142 | } |
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143 | |
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144 | upap_sauthreq(u); /* Start protocol */ |
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145 | } |
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146 | |
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147 | |
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148 | /* |
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149 | * upap_authpeer - Authenticate our peer (start server). |
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150 | * |
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151 | * Set new state. |
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152 | */ |
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153 | void |
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154 | upap_authpeer(unit) |
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155 | int unit; |
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156 | { |
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157 | upap_state *u = &upap[unit]; |
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158 | |
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159 | /* Lower layer up yet? */ |
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160 | if (u->us_serverstate == UPAPSS_INITIAL || |
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161 | u->us_serverstate == UPAPSS_PENDING) { |
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162 | u->us_serverstate = UPAPSS_PENDING; |
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163 | return; |
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164 | } |
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165 | |
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166 | u->us_serverstate = UPAPSS_LISTEN; |
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167 | if (u->us_reqtimeout > 0) |
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168 | TIMEOUT(upap_reqtimeout, u, u->us_reqtimeout); |
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169 | } |
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170 | |
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171 | |
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172 | /* |
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173 | * upap_timeout - Retransmission timer for sending auth-reqs expired. |
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174 | */ |
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175 | static void |
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176 | upap_timeout(arg) |
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177 | void *arg; |
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178 | { |
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179 | upap_state *u = (upap_state *) arg; |
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180 | |
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181 | if (u->us_clientstate != UPAPCS_AUTHREQ) |
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182 | return; |
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183 | |
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184 | if (u->us_transmits >= u->us_maxtransmits) { |
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185 | /* give up in disgust */ |
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186 | error("No response to PAP authenticate-requests"); |
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187 | u->us_clientstate = UPAPCS_BADAUTH; |
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188 | auth_withpeer_fail(u->us_unit, PPP_PAP); |
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189 | return; |
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190 | } |
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191 | |
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192 | upap_sauthreq(u); /* Send Authenticate-Request */ |
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193 | } |
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194 | |
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195 | |
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196 | /* |
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197 | * upap_reqtimeout - Give up waiting for the peer to send an auth-req. |
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198 | */ |
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199 | static void |
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200 | upap_reqtimeout(arg) |
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201 | void *arg; |
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202 | { |
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203 | upap_state *u = (upap_state *) arg; |
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204 | |
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205 | if (u->us_serverstate != UPAPSS_LISTEN) |
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206 | return; /* huh?? */ |
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207 | |
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208 | auth_peer_fail(u->us_unit, PPP_PAP); |
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209 | u->us_serverstate = UPAPSS_BADAUTH; |
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210 | } |
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211 | |
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212 | |
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213 | /* |
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214 | * upap_lowerup - The lower layer is up. |
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215 | * |
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216 | * Start authenticating if pending. |
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217 | */ |
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218 | static void |
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219 | upap_lowerup(unit) |
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220 | int unit; |
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221 | { |
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222 | upap_state *u = &upap[unit]; |
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223 | |
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224 | if (u->us_clientstate == UPAPCS_INITIAL) |
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225 | u->us_clientstate = UPAPCS_CLOSED; |
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226 | else if (u->us_clientstate == UPAPCS_PENDING) { |
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227 | upap_sauthreq(u); /* send an auth-request */ |
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228 | } |
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229 | |
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230 | if (u->us_serverstate == UPAPSS_INITIAL) |
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231 | u->us_serverstate = UPAPSS_CLOSED; |
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232 | else if (u->us_serverstate == UPAPSS_PENDING) { |
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233 | u->us_serverstate = UPAPSS_LISTEN; |
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234 | if (u->us_reqtimeout > 0) |
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235 | TIMEOUT(upap_reqtimeout, u, u->us_reqtimeout); |
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236 | } |
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237 | } |
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238 | |
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239 | |
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240 | /* |
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241 | * upap_lowerdown - The lower layer is down. |
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242 | * |
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243 | * Cancel all timeouts. |
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244 | */ |
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245 | static void |
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246 | upap_lowerdown(unit) |
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247 | int unit; |
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248 | { |
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249 | upap_state *u = &upap[unit]; |
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250 | |
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251 | if (u->us_clientstate == UPAPCS_AUTHREQ) /* Timeout pending? */ |
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252 | UNTIMEOUT(upap_timeout, u); /* Cancel timeout */ |
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253 | if (u->us_serverstate == UPAPSS_LISTEN && u->us_reqtimeout > 0) |
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254 | UNTIMEOUT(upap_reqtimeout, u); |
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255 | |
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256 | u->us_clientstate = UPAPCS_INITIAL; |
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257 | u->us_serverstate = UPAPSS_INITIAL; |
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258 | } |
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259 | |
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260 | |
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261 | /* |
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262 | * upap_protrej - Peer doesn't speak this protocol. |
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263 | * |
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264 | * This shouldn't happen. In any case, pretend lower layer went down. |
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265 | */ |
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266 | static void |
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267 | upap_protrej(unit) |
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268 | int unit; |
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269 | { |
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270 | upap_state *u = &upap[unit]; |
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271 | |
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272 | if (u->us_clientstate == UPAPCS_AUTHREQ) { |
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273 | error("PAP authentication failed due to protocol-reject"); |
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274 | auth_withpeer_fail(unit, PPP_PAP); |
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275 | } |
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276 | if (u->us_serverstate == UPAPSS_LISTEN) { |
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277 | error("PAP authentication of peer failed (protocol-reject)"); |
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278 | auth_peer_fail(unit, PPP_PAP); |
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279 | } |
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280 | upap_lowerdown(unit); |
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281 | } |
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282 | |
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283 | |
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284 | /* |
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285 | * upap_input - Input UPAP packet. |
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286 | */ |
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287 | static void |
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288 | upap_input(unit, inpacket, l) |
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289 | int unit; |
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290 | u_char *inpacket; |
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291 | int l; |
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292 | { |
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293 | upap_state *u = &upap[unit]; |
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294 | u_char *inp; |
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295 | u_char code, id; |
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296 | int len; |
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297 | |
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298 | /* |
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299 | * Parse header (code, id and length). |
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300 | * If packet too short, drop it. |
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301 | */ |
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302 | inp = inpacket; |
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303 | if (l < UPAP_HEADERLEN) { |
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304 | UPAPDEBUG(("pap_input: rcvd short header.")); |
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305 | return; |
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306 | } |
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307 | GETCHAR(code, inp); |
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308 | GETCHAR(id, inp); |
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309 | GETSHORT(len, inp); |
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310 | if (len < UPAP_HEADERLEN) { |
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311 | UPAPDEBUG(("pap_input: rcvd illegal length.")); |
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312 | return; |
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313 | } |
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314 | if (len > l) { |
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315 | UPAPDEBUG(("pap_input: rcvd short packet.")); |
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316 | return; |
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317 | } |
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318 | len -= UPAP_HEADERLEN; |
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319 | |
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320 | /* |
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321 | * Action depends on code. |
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322 | */ |
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323 | switch (code) { |
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324 | case UPAP_AUTHREQ: |
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325 | upap_rauthreq(u, inp, id, len); |
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326 | break; |
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327 | |
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328 | case UPAP_AUTHACK: |
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329 | upap_rauthack(u, inp, id, len); |
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330 | break; |
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331 | |
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332 | case UPAP_AUTHNAK: |
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333 | upap_rauthnak(u, inp, id, len); |
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334 | break; |
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335 | |
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336 | default: /* XXX Need code reject */ |
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337 | break; |
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338 | } |
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339 | } |
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340 | |
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341 | |
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342 | /* |
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343 | * upap_rauth - Receive Authenticate. |
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344 | */ |
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345 | static void |
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346 | upap_rauthreq(u, inp, id, len) |
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347 | upap_state *u; |
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348 | u_char *inp; |
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349 | int id; |
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350 | int len; |
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351 | { |
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352 | u_char ruserlen, rpasswdlen; |
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353 | char *ruser, *rpasswd; |
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354 | int retcode; |
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355 | char *msg; |
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356 | int msglen; |
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357 | |
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358 | if (u->us_serverstate < UPAPSS_LISTEN) |
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359 | return; |
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360 | |
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361 | /* |
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362 | * If we receive a duplicate authenticate-request, we are |
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363 | * supposed to return the same status as for the first request. |
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364 | */ |
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365 | if (u->us_serverstate == UPAPSS_OPEN) { |
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366 | upap_sresp(u, UPAP_AUTHACK, id, "", 0); /* return auth-ack */ |
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367 | return; |
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368 | } |
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369 | if (u->us_serverstate == UPAPSS_BADAUTH) { |
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370 | upap_sresp(u, UPAP_AUTHNAK, id, "", 0); /* return auth-nak */ |
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371 | return; |
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372 | } |
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373 | |
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374 | /* |
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375 | * Parse user/passwd. |
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376 | */ |
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377 | if (len < 1) { |
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378 | UPAPDEBUG(("pap_rauth: rcvd short packet.")); |
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379 | return; |
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380 | } |
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381 | GETCHAR(ruserlen, inp); |
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382 | len -= sizeof (u_char) + ruserlen + sizeof (u_char); |
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383 | if (len < 0) { |
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384 | UPAPDEBUG(("pap_rauth: rcvd short packet.")); |
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385 | return; |
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386 | } |
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387 | ruser = (char *) inp; |
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388 | INCPTR(ruserlen, inp); |
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389 | GETCHAR(rpasswdlen, inp); |
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390 | if (len < rpasswdlen) { |
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391 | UPAPDEBUG(("pap_rauth: rcvd short packet.")); |
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392 | return; |
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393 | } |
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394 | rpasswd = (char *) inp; |
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395 | |
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396 | /* |
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397 | * Check the username and password given. |
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398 | */ |
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399 | retcode = check_passwd(u->us_unit, ruser, ruserlen, rpasswd, |
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400 | rpasswdlen, &msg); |
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401 | BZERO(rpasswd, rpasswdlen); |
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402 | msglen = strlen(msg); |
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403 | if (msglen > 255) |
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404 | msglen = 255; |
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405 | |
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406 | upap_sresp(u, retcode, id, msg, msglen); |
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407 | |
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408 | if (retcode == UPAP_AUTHACK) { |
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409 | u->us_serverstate = UPAPSS_OPEN; |
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410 | auth_peer_success(u->us_unit, PPP_PAP, ruser, ruserlen); |
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411 | } else { |
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412 | u->us_serverstate = UPAPSS_BADAUTH; |
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413 | auth_peer_fail(u->us_unit, PPP_PAP); |
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414 | } |
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415 | |
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416 | if (u->us_reqtimeout > 0) |
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417 | UNTIMEOUT(upap_reqtimeout, u); |
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418 | } |
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419 | |
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420 | |
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421 | /* |
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422 | * upap_rauthack - Receive Authenticate-Ack. |
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423 | */ |
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424 | static void |
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425 | upap_rauthack(u, inp, id, len) |
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426 | upap_state *u; |
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427 | u_char *inp; |
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428 | int id; |
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429 | int len; |
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430 | { |
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431 | u_char msglen; |
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432 | char *msg; |
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433 | |
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434 | if (u->us_clientstate != UPAPCS_AUTHREQ) /* XXX */ |
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435 | return; |
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436 | |
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437 | /* |
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438 | * Parse message. |
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439 | */ |
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440 | if (len < 1) { |
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441 | UPAPDEBUG(("pap_rauthack: ignoring missing msg-length.")); |
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442 | } else { |
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443 | GETCHAR(msglen, inp); |
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444 | if (msglen > 0) { |
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445 | len -= sizeof (u_char); |
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446 | if (len < msglen) { |
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447 | UPAPDEBUG(("pap_rauthack: rcvd short packet.")); |
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448 | return; |
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449 | } |
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450 | msg = (char *) inp; |
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451 | PRINTMSG(msg, msglen); |
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452 | } |
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453 | } |
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454 | |
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455 | u->us_clientstate = UPAPCS_OPEN; |
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456 | |
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457 | auth_withpeer_success(u->us_unit, PPP_PAP); |
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458 | } |
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459 | |
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460 | |
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461 | /* |
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462 | * upap_rauthnak - Receive Authenticate-Nakk. |
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463 | */ |
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464 | static void |
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465 | upap_rauthnak(u, inp, id, len) |
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466 | upap_state *u; |
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467 | u_char *inp; |
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468 | int id; |
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469 | int len; |
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470 | { |
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471 | u_char msglen; |
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472 | char *msg; |
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473 | |
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474 | if (u->us_clientstate != UPAPCS_AUTHREQ) /* XXX */ |
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475 | return; |
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476 | |
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477 | /* |
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478 | * Parse message. |
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479 | */ |
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480 | if (len < 1) { |
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481 | UPAPDEBUG(("pap_rauthnak: ignoring missing msg-length.")); |
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482 | } else { |
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483 | GETCHAR(msglen, inp); |
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484 | if (msglen > 0) { |
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485 | len -= sizeof (u_char); |
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486 | if (len < msglen) { |
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487 | UPAPDEBUG(("pap_rauthnak: rcvd short packet.")); |
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488 | return; |
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489 | } |
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490 | msg = (char *) inp; |
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491 | PRINTMSG(msg, msglen); |
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492 | } |
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493 | } |
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494 | |
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495 | u->us_clientstate = UPAPCS_BADAUTH; |
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496 | |
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497 | error("PAP authentication failed"); |
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498 | auth_withpeer_fail(u->us_unit, PPP_PAP); |
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499 | } |
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500 | |
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501 | |
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502 | /* |
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503 | * upap_sauthreq - Send an Authenticate-Request. |
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504 | */ |
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505 | static void |
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506 | upap_sauthreq(u) |
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507 | upap_state *u; |
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508 | { |
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509 | u_char *outp; |
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510 | int outlen; |
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511 | |
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512 | outlen = UPAP_HEADERLEN + 2 * sizeof (u_char) + |
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513 | u->us_userlen + u->us_passwdlen; |
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514 | outp = outpacket_buf; |
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515 | |
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516 | MAKEHEADER(outp, PPP_PAP); |
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517 | |
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518 | PUTCHAR(UPAP_AUTHREQ, outp); |
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519 | PUTCHAR(++u->us_id, outp); |
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520 | PUTSHORT(outlen, outp); |
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521 | PUTCHAR(u->us_userlen, outp); |
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522 | BCOPY(u->us_user, outp, u->us_userlen); |
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523 | INCPTR(u->us_userlen, outp); |
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524 | PUTCHAR(u->us_passwdlen, outp); |
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525 | BCOPY(u->us_passwd, outp, u->us_passwdlen); |
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526 | |
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527 | output(u->us_unit, outpacket_buf, outlen + PPP_HDRLEN); |
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528 | |
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529 | TIMEOUT(upap_timeout, u, u->us_timeouttime); |
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530 | ++u->us_transmits; |
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531 | u->us_clientstate = UPAPCS_AUTHREQ; |
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532 | } |
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533 | |
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534 | |
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535 | /* |
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536 | * upap_sresp - Send a response (ack or nak). |
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537 | */ |
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538 | static void |
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539 | upap_sresp(u, code, id, msg, msglen) |
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540 | upap_state *u; |
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541 | u_char code, id; |
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542 | char *msg; |
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543 | int msglen; |
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544 | { |
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545 | u_char *outp; |
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546 | int outlen; |
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547 | |
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548 | outlen = UPAP_HEADERLEN + sizeof (u_char) + msglen; |
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549 | outp = outpacket_buf; |
---|
550 | MAKEHEADER(outp, PPP_PAP); |
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551 | |
---|
552 | PUTCHAR(code, outp); |
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553 | PUTCHAR(id, outp); |
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554 | PUTSHORT(outlen, outp); |
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555 | PUTCHAR(msglen, outp); |
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556 | BCOPY(msg, outp, msglen); |
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557 | output(u->us_unit, outpacket_buf, outlen + PPP_HDRLEN); |
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558 | } |
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559 | |
---|
560 | /* |
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561 | * upap_printpkt - print the contents of a PAP packet. |
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562 | */ |
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563 | static char *upap_codenames[] = { |
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564 | "AuthReq", "AuthAck", "AuthNak" |
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565 | }; |
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566 | |
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567 | static int |
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568 | upap_printpkt(p, plen, printer, arg) |
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569 | u_char *p; |
---|
570 | int plen; |
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571 | void (*printer) __P((void *, char *, ...)); |
---|
572 | void *arg; |
---|
573 | { |
---|
574 | int code, id, len; |
---|
575 | int mlen, ulen, wlen; |
---|
576 | char *user, *pwd, *msg; |
---|
577 | u_char *pstart; |
---|
578 | |
---|
579 | if (plen < UPAP_HEADERLEN) |
---|
580 | return 0; |
---|
581 | pstart = p; |
---|
582 | GETCHAR(code, p); |
---|
583 | GETCHAR(id, p); |
---|
584 | GETSHORT(len, p); |
---|
585 | if (len < UPAP_HEADERLEN || len > plen) |
---|
586 | return 0; |
---|
587 | |
---|
588 | if (code >= 1 && code <= sizeof(upap_codenames) / sizeof(char *)) |
---|
589 | printer(arg, " %s", upap_codenames[code-1]); |
---|
590 | else |
---|
591 | printer(arg, " code=0x%x", code); |
---|
592 | printer(arg, " id=0x%x", id); |
---|
593 | len -= UPAP_HEADERLEN; |
---|
594 | switch (code) { |
---|
595 | case UPAP_AUTHREQ: |
---|
596 | if (len < 1) |
---|
597 | break; |
---|
598 | ulen = p[0]; |
---|
599 | if (len < ulen + 2) |
---|
600 | break; |
---|
601 | wlen = p[ulen + 1]; |
---|
602 | if (len < ulen + wlen + 2) |
---|
603 | break; |
---|
604 | user = (char *) (p + 1); |
---|
605 | pwd = (char *) (p + ulen + 2); |
---|
606 | p += ulen + wlen + 2; |
---|
607 | len -= ulen + wlen + 2; |
---|
608 | printer(arg, " user="); |
---|
609 | print_string(user, ulen, printer, arg); |
---|
610 | printer(arg, " password="); |
---|
611 | if (!hide_password) |
---|
612 | print_string(pwd, wlen, printer, arg); |
---|
613 | else |
---|
614 | printer(arg, "<hidden>"); |
---|
615 | break; |
---|
616 | case UPAP_AUTHACK: |
---|
617 | case UPAP_AUTHNAK: |
---|
618 | if (len < 1) |
---|
619 | break; |
---|
620 | mlen = p[0]; |
---|
621 | if (len < mlen + 1) |
---|
622 | break; |
---|
623 | msg = (char *) (p + 1); |
---|
624 | p += mlen + 1; |
---|
625 | len -= mlen + 1; |
---|
626 | printer(arg, " "); |
---|
627 | print_string(msg, mlen, printer, arg); |
---|
628 | break; |
---|
629 | } |
---|
630 | |
---|
631 | /* print the rest of the bytes in the packet */ |
---|
632 | for (; len > 0; --len) { |
---|
633 | GETCHAR(code, p); |
---|
634 | printer(arg, " %.2x", code); |
---|
635 | } |
---|
636 | |
---|
637 | return p - pstart; |
---|
638 | } |
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