Mercurial > dropbear

annotate cli-authinteract.c @ 662:d354464b2aa6 DROPBEAR_2012.55

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- Improve CHANGES description
author Matt Johnston <matt@ucc.asn.au>
date Thu, 23 Feb 2012 21:45:36 +0800
parents 8cd04e707171
children c45d65392c1a
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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 /* Let the user know what password/host they are authing for */
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81 if (!cli_ses.interact_request_received) {
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82 fprintf(stderr, "Login for %s@%s\n", cli_opts.username,
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83 cli_opts.remotehost);
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84 }
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85 cli_ses.interact_request_received = 1;
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86
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87 name = buf_getstring(ses.payload, NULL);
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88 instruction = buf_getstring(ses.payload, NULL);
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89
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90 /* language tag */
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91 buf_eatstring(ses.payload);
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92
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93 num_prompts = buf_getint(ses.payload);
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94
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95 if (num_prompts >= DROPBEAR_MAX_CLI_INTERACT_PROMPTS) {
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96 dropbear_exit("Too many prompts received for keyboard-interactive");
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97 }
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98
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99 /* we'll build the response as we go */
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100 CHECKCLEARTOWRITE();
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101 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_INFO_RESPONSE);
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102 buf_putint(ses.writepayload, num_prompts);
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103
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104 if (strlen(name) > 0) {
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105 cleantext(name);
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106 fprintf(stderr, "%s", name);
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107 }
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108 m_free(name);
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109
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110 if (strlen(instruction) > 0) {
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111 cleantext(instruction);
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112 fprintf(stderr, "%s", instruction);
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113 }
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114 m_free(instruction);
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115
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116 for (i = 0; i < num_prompts; i++) {
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117 unsigned int response_len = 0;
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118 prompt = buf_getstring(ses.payload, NULL);
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119 cleantext(prompt);
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120
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121 echo = buf_getbool(ses.payload);
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122
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123 if (!echo) {
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124 unsigned char* p = getpass_or_cancel(prompt);
249
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125 response = m_strdup(p);
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126 m_burn(p, strlen(p));
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127 } else {
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128 response = get_response(prompt);
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129 }
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130
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131 response_len = strlen(response);
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132 buf_putstring(ses.writepayload, response, response_len);
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133 m_burn(response, response_len);
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134 m_free(prompt);
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135 m_free(response);
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136 }
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137
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138 encrypt_packet();
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139
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140
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141 TRACE(("leave recv_msg_recv_userauth_info_request"))
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142 }
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143
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144 void cli_auth_interactive() {
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145
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146 TRACE(("enter cli_auth_interactive"))
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147 CHECKCLEARTOWRITE();
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148
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149 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST);
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150
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151 /* username */
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152 buf_putstring(ses.writepayload, cli_opts.username,
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153 strlen(cli_opts.username));
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154
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155 /* service name */
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156 buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION,
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157 SSH_SERVICE_CONNECTION_LEN);
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158
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159 /* method */
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160 buf_putstring(ses.writepayload, AUTH_METHOD_INTERACT,
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161 AUTH_METHOD_INTERACT_LEN);
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162
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163 /* empty language tag */
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164 buf_putstring(ses.writepayload, "", 0);
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165
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166 /* empty submethods */
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167 buf_putstring(ses.writepayload, "", 0);
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168
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169 encrypt_packet();
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170 cli_ses.interact_request_received = 0;
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171
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172 TRACE(("leave cli_auth_interactive"))
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173
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174 }
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175 #endif /* ENABLE_CLI_INTERACT_AUTH */