Mercurial > dropbear

annotate cli-authpasswd.c @ 1748:34d9d3c022ce

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Use Dropbear's random source rather than libtommath's platform
author Matt Johnston <matt@ucc.asn.au>
date Mon, 19 Oct 2020 22:49:19 +0800
parents 750ec4ec4cbe
children df8d8ec1801c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
74
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1 /*
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2 * Dropbear SSH
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3 *
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4 * Copyright (c) 2002,2003 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
33
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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"
35
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30 #include "runopts.h"
33
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31
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32 #if DROPBEAR_CLI_PASSWORD_AUTH
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33
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34 #if DROPBEAR_CLI_ASKPASS_HELPER
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35 /* Returns 1 if we want to use the askpass program, 0 otherwise */
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36 static int want_askpass()
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37 {
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38 char* askpass_prog = NULL;
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39
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40 askpass_prog = getenv("SSH_ASKPASS");
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41 return askpass_prog &&
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42 ((!isatty(STDIN_FILENO) && getenv("DISPLAY") )
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43 || getenv("SSH_ASKPASS_ALWAYS"));
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44 }
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45
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46 /* returns a statically allocated password from a helper app, or NULL
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47 * on failure */
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48 static char *gui_getpass(const char *prompt) {
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49
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50 pid_t pid;
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51 int p[2], maxlen, len, status;
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52 static char buf[DROPBEAR_MAX_CLI_PASS + 1];
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53 char* helper = NULL;
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54
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55 TRACE(("enter gui_getpass"))
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56
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57 helper = getenv("SSH_ASKPASS");
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58 if (!helper)
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59 {
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60 TRACE(("leave gui_getpass: no askpass program"))
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61 return NULL;
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62 }
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63
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64 if (pipe(p) < 0) {
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65 TRACE(("error creating child pipe"))
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66 return NULL;
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67 }
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68
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69 pid = fork();
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70
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71 if (pid < 0) {
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72 TRACE(("fork error"))
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73 return NULL;
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74 }
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75
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76 if (!pid) {
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77 /* child */
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78 close(p[0]);
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79 if (dup2(p[1], STDOUT_FILENO) < 0) {
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80 TRACE(("error redirecting stdout"))
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81 exit(1);
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82 }
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83 close(p[1]);
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84 execlp(helper, helper, prompt, (char *)0);
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85 TRACE(("execlp error"))
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86 exit(1);
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87 }
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88
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89 close(p[1]);
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90 maxlen = sizeof(buf);
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91 while (maxlen > 0) {
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92 len = read(p[0], buf + sizeof(buf) - maxlen, maxlen);
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93 if (len > 0) {
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94 maxlen -= len;
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95 } else {
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96 if (errno != EINTR)
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97 break;
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98 }
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99 }
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100
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101 close(p[0]);
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102
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103 while (waitpid(pid, &status, 0) < 0 && errno == EINTR)
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104 ;
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105 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
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106 return(NULL);
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107
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108 len = sizeof(buf) - maxlen;
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109 buf[len] = '\0';
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110 if (len > 0 && buf[len - 1] == '\n')
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111 buf[len - 1] = '\0';
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112
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113 TRACE(("leave gui_getpass"))
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114 return(buf);
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115 }
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116 #endif /* DROPBEAR_CLI_ASKPASS_HELPER */
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117
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118 void cli_auth_password() {
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119
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120 char* password = NULL;
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121 char prompt[80];
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122
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123 TRACE(("enter cli_auth_password"))
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124 CHECKCLEARTOWRITE();
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125
334
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126 snprintf(prompt, sizeof(prompt), "%s@%s's password: ",
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127 cli_opts.username, cli_opts.remotehost);
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128 #if DROPBEAR_CLI_ASKPASS_HELPER
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129 if (want_askpass())
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130 {
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131 password = gui_getpass(prompt);
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132 if (!password) {
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133 dropbear_exit("No password");
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134 }
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135 } else
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136 #endif
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137 {
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138 password = getpass_or_cancel(prompt);
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139 }
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140
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141 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST);
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142
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143 buf_putstring(ses.writepayload, cli_opts.username,
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144 strlen(cli_opts.username));
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145
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146 buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION,
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147 SSH_SERVICE_CONNECTION_LEN);
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148
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149 buf_putstring(ses.writepayload, AUTH_METHOD_PASSWORD,
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150 AUTH_METHOD_PASSWORD_LEN);
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151
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152 buf_putbyte(ses.writepayload, 0); /* FALSE - so says the spec */
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153
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154 buf_putstring(ses.writepayload, password, strlen(password));
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155
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156 encrypt_packet();
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157 m_burn(password, strlen(password));
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158
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159 TRACE(("leave cli_auth_password"))
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160 }
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161 #endif /* DROPBEAR_CLI_PASSWORD_AUTH */