annotate svr-agentfwd.c @ 4:fe6bca95afa7

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author Matt Johnston <matt@ucc.asn.au>
date Tue, 01 Jun 2004 02:46:09 +0000
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children bc6477a6c393
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1 /*
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2 * Dropbear - a SSH2 server
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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
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25 /* This file (agentfwd.c) handles authentication agent forwarding, for OpenSSH
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26 * style agents. */
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27
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28 #include "includes.h"
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29
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30 #ifndef DISABLE_AGENTFWD
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31
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32 #include "agentfwd.h"
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33 #include "session.h"
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34 #include "ssh.h"
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35 #include "dbutil.h"
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36 #include "chansession.h"
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37 #include "channel.h"
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38 #include "packet.h"
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39 #include "buffer.h"
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40 #include "random.h"
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41
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42 #define AGENTDIRPREFIX "/tmp/dropbear-"
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43
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44 static int send_msg_channel_open_agent(int fd);
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45 static int bindagent(struct ChanSess * chansess);
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46
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47 /* Handles client requests to start agent forwarding, sets up listening socket.
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48 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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49 int agentreq(struct ChanSess * chansess) {
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50
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51 if (chansess->agentfd != -1) {
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52 return DROPBEAR_FAILURE;
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53 }
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54
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55 /* create listening socket */
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56 chansess->agentfd = socket(PF_UNIX, SOCK_STREAM, 0);
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57 if (chansess->agentfd < 0) {
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58 goto fail;
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59 }
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60
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61 /* create the unix socket dir and file */
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62 if (bindagent(chansess) == DROPBEAR_FAILURE) {
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63 return DROPBEAR_FAILURE;
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64 }
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65
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66 /* listen */
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67 if (listen(chansess->agentfd, 20) < 0) {
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68 goto fail;
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69 }
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70
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71 /* set non-blocking */
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72 if (fcntl(chansess->agentfd, F_SETFL, O_NONBLOCK) < 0) {
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73 goto fail;
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74 }
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75
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76 /* channel.c's channel fd code will handle the socket now */
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77
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78 /* set the maxfd so that select() loop will notice it */
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79 ses.maxfd = MAX(ses.maxfd, chansess->agentfd);
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80
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81 return DROPBEAR_SUCCESS;
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82
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83 fail:
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84 /* cleanup */
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85 agentcleanup(chansess);
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86
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87 return DROPBEAR_FAILURE;
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88 }
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89
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90 /* accepts a connection on the forwarded socket and opens a new channel for it
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91 * back to the client */
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92 /* returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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93 int agentaccept(struct ChanSess * chansess) {
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94
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95 int fd;
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96
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97 fd = accept(chansess->agentfd, NULL, NULL);
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98 if (fd < 0) {
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99 return DROPBEAR_FAILURE;
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100 }
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101
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102 return send_msg_channel_open_agent(fd);
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103
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104 }
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105
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106 /* set up the environment variable pointing to the socket. This is called
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107 * just before command/shell execution, after dropping priveleges */
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108 void agentset(struct ChanSess * chansess) {
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109
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110 char *path = NULL;
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111 int len;
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112
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113 if (chansess->agentfd == -1) {
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114 return;
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115 }
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116
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117 /* 2 for "/" and "\0" */
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118 len = strlen(chansess->agentdir) + strlen(chansess->agentfile) + 2;
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119
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120 path = m_malloc(len);
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121 snprintf(path, len, "%s/%s", chansess->agentdir, chansess->agentfile);
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122 addnewvar("SSH_AUTH_SOCK", path);
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123 m_free(path);
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124 }
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125
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126 /* close the socket, remove the socket-file */
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127 void agentcleanup(struct ChanSess * chansess) {
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128
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129 char *path = NULL;
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130 uid_t uid;
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131 gid_t gid;
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132 int len;
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133
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134 if (chansess->agentfd == -1) {
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135 return;
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136 }
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137
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138 close(chansess->agentfd);
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139
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140 /* Remove the dir as the user. That way they can't cause problems except
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141 * for themselves */
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142 uid = getuid();
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143 gid = getgid();
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144 if ((setegid(ses.authstate.pw->pw_gid)) < 0 ||
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145 (seteuid(ses.authstate.pw->pw_uid)) < 0) {
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146 dropbear_exit("failed to set euid");
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147 }
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148
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149 /* 2 for "/" and "\0" */
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150 len = strlen(chansess->agentdir) + strlen(chansess->agentfile) + 2;
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151
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152 path = m_malloc(len);
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153 snprintf(path, len, "%s/%s", chansess->agentdir, chansess->agentfile);
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154 unlink(path);
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155 m_free(path);
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156
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157 rmdir(chansess->agentdir);
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158
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159 if ((seteuid(uid)) < 0 ||
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160 (setegid(gid)) < 0) {
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161 dropbear_exit("failed to revert euid");
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162 }
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163
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164 m_free(chansess->agentfile);
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165 m_free(chansess->agentdir);
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166
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167 }
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168
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169 /* helper for accepting an agent request */
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170 static int send_msg_channel_open_agent(int fd) {
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171
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172 if (send_msg_channel_open_init(fd, CHANNEL_ID_AGENT,
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173 "[email protected]") == DROPBEAR_SUCCESS) {
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174 encrypt_packet();
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175 return DROPBEAR_SUCCESS;
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176 } else {
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177 return DROPBEAR_FAILURE;
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178 }
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179 }
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180
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181 /* helper for creating the agent socket-file
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182 returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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183 static int bindagent(struct ChanSess * chansess) {
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184
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185 struct sockaddr_un addr;
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186 unsigned int prefix;
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187 char path[sizeof(addr.sun_path)], sockfile[sizeof(addr.sun_path)];
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188 mode_t mode;
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189 int i;
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190 uid_t uid;
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191 gid_t gid;
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192 int ret = DROPBEAR_FAILURE;
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193
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194 /* drop to user privs to make the dir/file */
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195 uid = getuid();
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196 gid = getgid();
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197 if ((setegid(ses.authstate.pw->pw_gid)) < 0 ||
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198 (seteuid(ses.authstate.pw->pw_uid)) < 0) {
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199 dropbear_exit("failed to set euid");
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200 }
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201
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202 memset((void*)&addr, 0x0, sizeof(addr));
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203 addr.sun_family = AF_UNIX;
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204
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205 mode = S_IRWXU;
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206
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207 for (i = 0; i < 20; i++) {
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208 genrandom((unsigned char*)&prefix, sizeof(prefix));
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209 /* we want 32 bits (8 hex digits) - "/tmp/dropbear-f19c62c0" */
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210 snprintf(path, sizeof(path), AGENTDIRPREFIX "%.8x", prefix);
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211
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212 if (mkdir(path, mode) == 0) {
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213 goto bindsocket;
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214 }
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215 if (errno != EEXIST) {
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216 break;
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217 }
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218 }
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219 /* couldn't make a dir */
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220 goto out;
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221
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222 bindsocket:
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223 /* Format is "/tmp/dropbear-0246dead/auth-d00f7654-23".
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224 * The "23" is the file desc, the random data is to avoid collisions
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225 * between subsequent user processes reusing socket fds (odds are now
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226 * 1/(2^64) */
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227 genrandom((unsigned char*)&prefix, sizeof(prefix));
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228 snprintf(sockfile, sizeof(sockfile), "auth-%.8x-%d", prefix,
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229 chansess->agentfd);
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230 snprintf(addr.sun_path, sizeof(addr.sun_path), "%s/%s", path, sockfile);
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231
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232 if (bind(chansess->agentfd, (struct sockaddr*)&addr, sizeof(addr)) == 0) {
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233 chansess->agentdir = strdup(path);
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234 chansess->agentfile = strdup(sockfile);
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235 ret = DROPBEAR_SUCCESS;
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236 }
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237
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238
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239 out:
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240 if ((seteuid(uid)) < 0 ||
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241 (setegid(gid)) < 0) {
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242 dropbear_exit("failed to revert euid");
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243 }
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244 return ret;
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245 }
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246
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247 #endif