Mercurial > dropbear

annotate cli-authpasswd.c @ 233:225e6822ef53

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author Matt Johnston <matt@ucc.asn.au>
date Tue, 30 Aug 2005 18:00:11 +0000
parents 257f09a63dab
children efbaf6b03837
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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"
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31
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32 #ifdef ENABLE_CLI_PASSWORD_AUTH
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33
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34 #ifdef ENABLE_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 && !isatty(STDIN_FILENO) && getenv("DISPLAY");
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42 }
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43
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44 /* returns a statically allocated password from a helper app, or NULL
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45 * on failure */
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46 static char *gui_getpass(const char *prompt) {
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47
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48 pid_t pid;
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49 int p[2], maxlen, len, status;
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50 static char buf[DROPBEAR_MAX_CLI_PASS + 1];
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51 char* helper = NULL;
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52
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53 TRACE(("enter gui_getpass"))
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54
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55 helper = getenv("SSH_ASKPASS");
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56 if (!helper)
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57 {
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58 TRACE(("leave gui_getpass: no askpass program"))
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59 return NULL;
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60 }
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61
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62 if (pipe(p) < 0) {
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63 TRACE(("error creating child pipe"))
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64 return NULL;
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65 }
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66
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67 pid = fork();
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68
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69 if (pid < 0) {
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70 TRACE(("fork error"))
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71 return NULL;
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72 }
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73
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74 if (!pid) {
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75 /* child */
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76 close(p[0]);
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77 if (dup2(p[1], STDOUT_FILENO) < 0) {
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78 TRACE(("error redirecting stdout"))
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79 exit(1);
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80 }
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81 close(p[1]);
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82 execlp(helper, helper, prompt, (char *)0);
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83 TRACE(("execlp error"))
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84 exit(1);
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85 }
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86
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87 close(p[1]);
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88 maxlen = sizeof(buf);
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89 while (maxlen > 0) {
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90 len = read(p[0], buf + sizeof(buf) - maxlen, maxlen);
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91 if (len > 0) {
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92 maxlen -= len;
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93 } else {
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94 if (errno != EINTR)
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95 break;
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96 }
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97 }
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98
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99 close(p[0]);
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100
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101 while (waitpid(pid, &status, 0) < 0 && errno == EINTR)
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102 ;
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103 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
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104 return(NULL);
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105
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106 len = sizeof(buf) - maxlen;
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107 buf[len] = '\0';
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108 if (len > 0 && buf[len - 1] == '\n')
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109 buf[len - 1] = '\0';
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110
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111 TRACE(("leave gui_getpass"))
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112 return(buf);
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113 }
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114 #endif /* ENABLE_CLI_ASKPASS_HELPER */
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115
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116 int cli_auth_password() {
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117
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118 char* password = NULL;
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119
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120 TRACE(("enter cli_auth_password"))
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121 CHECKCLEARTOWRITE();
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122
173
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123 #ifdef ENABLE_CLI_ASKPASS_HELPER
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124 if (want_askpass())
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125 password = gui_getpass("Password: ");
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126 else
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127 #endif
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128 password = getpass("Password: ");
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129
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130 if (password == NULL)
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131 return 0;
33
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132
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133 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST);
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134
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135 buf_putstring(ses.writepayload, cli_opts.username,
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136 strlen(cli_opts.username));
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137
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138 buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION,
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139 SSH_SERVICE_CONNECTION_LEN);
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140
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141 buf_putstring(ses.writepayload, AUTH_METHOD_PASSWORD,
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142 AUTH_METHOD_PASSWORD_LEN);
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143
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144 buf_putbyte(ses.writepayload, 0); /* FALSE - so says the spec */
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145
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146 buf_putstring(ses.writepayload, password, strlen(password));
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147
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148 encrypt_packet();
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149 m_burn(password, strlen(password));
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150
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151 TRACE(("leave cli_auth_password"))
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152 return 1; /* Password auth can always be tried */
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153
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154 }
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155 #endif /* ENABLE_CLI_PASSWORD_AUTH */