Mercurial > dropbear

annotate cli-authinteract.c @ 1665:7c17995bcdfb

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Improve address logging on early exit messages (#83) Change 'Early exit' and 'Exit before auth' messages to include the IP address & port as part of the message. This allows log scanning utilities such as 'fail2ban' to obtain the offending IP address as part of the failure event instead of extracting the PID from the message and then scanning the log again for match 'child connection from' messages Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>
author Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
date Wed, 18 Mar 2020 15:28:56 +0000
parents 750ec4ec4cbe
children df8d8ec1801c
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 #if DROPBEAR_CLI_INTERACT_AUTH
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33
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34 static char* get_response(char* prompt)
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35 {
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36 FILE* tty = NULL;
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37 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 = 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 = 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 char *name = NULL;
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70 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 char *prompt = NULL;
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75 unsigned int echo = 0;
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76 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 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 /* DROPBEAR_CLI_INTERACT_AUTH */