Mercurial > dropbear
annotate cli-authinteract.c @ 1060:4c733310c21d nocircbuffer
reword comment for clarity
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 01 Mar 2015 23:26:42 +0800 |
parents | 8cd04e707171 |
children | c45d65392c1a |
rev | line source |
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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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124 unsigned char* p = getpass_or_cancel(prompt); |
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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 */ |