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annotate cli-authinteract.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
parents 31743c9bdf78
children a24139ba08c8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Dropbear SSH
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3 *
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4 * Copyright (c) 2005 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "includes.h"
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26 #include "buffer.h"
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27 #include "dbutil.h"
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28 #include "session.h"
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29 #include "ssh.h"
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30 #include "runopts.h"
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31
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32 #ifdef ENABLE_CLI_INTERACT_AUTH
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33
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34 static unsigned char* get_response(unsigned char* prompt)
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35 {
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36 FILE* tty = NULL;
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37 unsigned char* response = NULL;
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38 /* not a password, but a reasonable limit */
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39 char buf[DROPBEAR_MAX_CLI_PASS];
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40 char* ret = NULL;
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41
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42 fprintf(stderr, "%s", prompt);
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43
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44 tty = fopen(_PATH_TTY, "r");
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45 if (tty) {
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46 ret = fgets(buf, sizeof(buf), tty);
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47 fclose(tty);
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48 } else {
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49 ret = fgets(buf, sizeof(buf), stdin);
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50 }
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51
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52 if (ret == NULL) {
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53 response = (unsigned char*)m_strdup("");
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54 } else {
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55 unsigned int buflen = strlen(buf);
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56 /* fgets includes newlines */
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57 if (buflen > 0 && buf[buflen-1] == '\n')
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58 buf[buflen-1] = '\0';
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59 response = (unsigned char*)m_strdup(buf);
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60 }
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61
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62 m_burn(buf, sizeof(buf));
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63
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64 return response;
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65 }
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66
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67 void recv_msg_userauth_info_request() {
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68
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69 unsigned char *name = NULL;
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70 unsigned char *instruction = NULL;
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71 unsigned int num_prompts = 0;
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72 unsigned int i;
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73
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74 unsigned char *prompt = NULL;
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75 unsigned int echo = 0;
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76 unsigned char *response = NULL;
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77
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78 TRACE(("enter recv_msg_recv_userauth_info_request"))
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79
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80 cli_ses.interact_request_received = 1;
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81
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82 name = buf_getstring(ses.payload, NULL);
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83 instruction = buf_getstring(ses.payload, NULL);
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84
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85 /* language tag */
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86 buf_eatstring(ses.payload);
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87
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88 num_prompts = buf_getint(ses.payload);
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89
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90 if (num_prompts >= DROPBEAR_MAX_CLI_INTERACT_PROMPTS) {
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91 dropbear_exit("Too many prompts received for keyboard-interactive");
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92 }
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93
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94 /* we'll build the response as we go */
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95 CHECKCLEARTOWRITE();
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96 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_INFO_RESPONSE);
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97 buf_putint(ses.writepayload, num_prompts);
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98
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99 if (strlen(name) > 0) {
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100 cleantext(name);
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101 fprintf(stderr, "%s", name);
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102 }
339
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103 m_free(name);
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104
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105 if (strlen(instruction) > 0) {
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106 cleantext(instruction);
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107 fprintf(stderr, "%s", instruction);
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108 }
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109 m_free(instruction);
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110
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111 for (i = 0; i < num_prompts; i++) {
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112 unsigned int response_len = 0;
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113 prompt = buf_getstring(ses.payload, NULL);
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114 cleantext(prompt);
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115
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116 echo = buf_getbool(ses.payload);
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117
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118 if (!echo) {
268
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119 unsigned char* p = getpass_or_cancel(prompt);
249
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120 response = m_strdup(p);
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121 m_burn(p, strlen(p));
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122 } else {
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123 response = get_response(prompt);
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124 }
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125
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126 response_len = strlen(response);
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127 buf_putstring(ses.writepayload, response, response_len);
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128 m_burn(response, response_len);
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129 m_free(response);
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130 }
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131
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132 encrypt_packet();
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133
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134
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135 TRACE(("leave recv_msg_recv_userauth_info_request"))
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136 }
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137
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138 void cli_auth_interactive() {
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139
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140 TRACE(("enter cli_auth_interactive"))
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141 CHECKCLEARTOWRITE();
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142
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143 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST);
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144
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145 /* username */
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146 buf_putstring(ses.writepayload, cli_opts.username,
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147 strlen(cli_opts.username));
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148
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149 /* service name */
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150 buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION,
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151 SSH_SERVICE_CONNECTION_LEN);
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152
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153 /* method */
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154 buf_putstring(ses.writepayload, AUTH_METHOD_INTERACT,
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155 AUTH_METHOD_INTERACT_LEN);
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156
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157 /* empty language tag */
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158 buf_putstring(ses.writepayload, "", 0);
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159
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160 /* empty submethods */
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161 buf_putstring(ses.writepayload, "", 0);
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162
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163 encrypt_packet();
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164 cli_ses.interact_request_received = 0;
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165
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166 TRACE(("leave cli_auth_interactive"))
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167
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168 }
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169 #endif /* ENABLE_CLI_INTERACT_AUTH */