Mercurial > dropbear

annotate svr-agentfwd.c @ 11:f76c9389e9e0

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Mostly done with the listener changeover
author Matt Johnston <matt@ucc.asn.au>
date Thu, 03 Jun 2004 17:22:48 +0000
parents bc6477a6c393
children db2c8e6fb284
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4
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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 #include "listener.h"
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42
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43 #define AGENTDIRPREFIX "/tmp/dropbear-"
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44
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45 static int send_msg_channel_open_agent(int fd);
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46 static int bindagent(int fd, struct ChanSess * chansess);
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47 static void agentaccept(struct Listener * listener);
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48
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49 /* Handles client requests to start agent forwarding, sets up listening socket.
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50 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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51 int agentreq(struct ChanSess * chansess) {
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52
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53 int fd;
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54
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55 if (chansess->agentlistener != NULL) {
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56 return DROPBEAR_FAILURE;
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57 }
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58
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59 /* create listening socket */
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60 fd = socket(PF_UNIX, SOCK_STREAM, 0);
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61 if (fd < 0) {
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62 goto fail;
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63 }
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64
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65 /* create the unix socket dir and file */
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66 if (bindagent(fd, chansess) == DROPBEAR_FAILURE) {
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67 return DROPBEAR_FAILURE;
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68 }
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69
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70 /* listen */
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71 if (listen(fd, 20) < 0) {
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72 goto fail;
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73 }
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74
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75 /* set non-blocking */
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76 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) {
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77 goto fail;
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78 }
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79
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80 /* pass if off to listener */
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81 chansess->agentlistener = new_listener( fd, 0, chansess,
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82 agentaccept, NULL);
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83
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84 if (chansess->agentlistener == NULL) {
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85 goto fail;
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86 }
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87
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88 return DROPBEAR_SUCCESS;
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89
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90 fail:
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91 /* cleanup */
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92 agentcleanup(chansess);
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93
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94 return DROPBEAR_FAILURE;
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95 }
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96
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97 /* accepts a connection on the forwarded socket and opens a new channel for it
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98 * back to the client */
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99 /* returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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100 static void agentaccept(struct Listener * listener) {
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101
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102 int fd;
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103
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104 fd = accept(listener->sock, NULL, NULL);
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105 if (fd < 0) {
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106 return;
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107 }
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108
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109 if (send_msg_channel_open_agent(listener->sock) != DROPBEAR_SUCCESS) {
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110 close(fd);
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111 }
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112
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113 }
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114
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115 /* set up the environment variable pointing to the socket. This is called
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116 * just before command/shell execution, after dropping priveleges */
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117 void agentset(struct ChanSess * chansess) {
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118
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119 char *path = NULL;
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120 int len;
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121
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122 if (chansess->agentlistener == NULL) {
4
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123 return;
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124 }
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125
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126 /* 2 for "/" and "\0" */
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127 len = strlen(chansess->agentdir) + strlen(chansess->agentfile) + 2;
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128
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129 path = m_malloc(len);
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130 snprintf(path, len, "%s/%s", chansess->agentdir, chansess->agentfile);
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131 addnewvar("SSH_AUTH_SOCK", path);
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132 m_free(path);
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133 }
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134
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135 /* close the socket, remove the socket-file */
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136 void agentcleanup(struct ChanSess * chansess) {
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137
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138 char *path = NULL;
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139 uid_t uid;
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140 gid_t gid;
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141 int len;
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142
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143 if (chansess->agentlistener != NULL) {
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144 remove_listener(chansess->agentlistener);
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145 chansess->agentlistener = NULL;
4
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146 }
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147
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148 if (chansess->agentfile && chansess->agentdir) {
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149
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150 /* Remove the dir as the user. That way they can't cause problems except
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151 * for themselves */
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152 uid = getuid();
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153 gid = getgid();
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154 if ((setegid(svr_ses.authstate.pw->pw_gid)) < 0 ||
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155 (seteuid(svr_ses.authstate.pw->pw_uid)) < 0) {
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156 dropbear_exit("failed to set euid");
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157 }
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158
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159 /* 2 for "/" and "\0" */
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160 len = strlen(chansess->agentdir) + strlen(chansess->agentfile) + 2;
4
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161
11
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162 path = m_malloc(len);
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163 snprintf(path, len, "%s/%s", chansess->agentdir, chansess->agentfile);
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164 unlink(path);
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165 m_free(path);
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166
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167 rmdir(chansess->agentdir);
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168
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169 if ((seteuid(uid)) < 0 ||
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170 (setegid(gid)) < 0) {
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171 dropbear_exit("failed to revert euid");
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172 }
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173
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174 m_free(chansess->agentfile);
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175 m_free(chansess->agentdir);
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176 }
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177
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178 }
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179
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180 static const struct ChanType chan_agent = {
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181 0, /* sepfds */
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182 "[email protected]",
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183 NULL,
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184 NULL,
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185 NULL,
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186 NULL
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187 };
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188
4
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189
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190 /* helper for accepting an agent request */
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191 static int send_msg_channel_open_agent(int fd) {
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192
11
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193 if (send_msg_channel_open_init(fd, &chan_agent) == DROPBEAR_SUCCESS) {
4
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194 encrypt_packet();
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195 return DROPBEAR_SUCCESS;
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196 } else {
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197 return DROPBEAR_FAILURE;
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198 }
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199 }
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200
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201 /* helper for creating the agent socket-file
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202 returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
11
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diff changeset
203 static int bindagent(int fd, struct ChanSess * chansess) {
4
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204
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205 struct sockaddr_un addr;
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206 unsigned int prefix;
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diff changeset
207 char path[sizeof(addr.sun_path)], sockfile[sizeof(addr.sun_path)];
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208 mode_t mode;
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diff changeset
209 int i;
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210 uid_t uid;
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diff changeset
211 gid_t gid;
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212 int ret = DROPBEAR_FAILURE;
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213
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214 /* drop to user privs to make the dir/file */
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215 uid = getuid();
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216 gid = getgid();
5
bc6477a6c393 syntactical fixups - it compiles, but channel handling code requires fixing.
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parents: 4
diff changeset
217 if ((setegid(svr_ses.authstate.pw->pw_gid)) < 0 ||
bc6477a6c393 syntactical fixups - it compiles, but channel handling code requires fixing.
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parents: 4
diff changeset
218 (seteuid(svr_ses.authstate.pw->pw_uid)) < 0) {
4
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diff changeset
219 dropbear_exit("failed to set euid");
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parents:
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220 }
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parents:
diff changeset
221
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parents:
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222 memset((void*)&addr, 0x0, sizeof(addr));
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parents:
diff changeset
223 addr.sun_family = AF_UNIX;
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parents:
diff changeset
224
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parents:
diff changeset
225 mode = S_IRWXU;
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parents:
diff changeset
226
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parents:
diff changeset
227 for (i = 0; i < 20; i++) {
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228 genrandom((unsigned char*)&prefix, sizeof(prefix));
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diff changeset
229 /* we want 32 bits (8 hex digits) - "/tmp/dropbear-f19c62c0" */
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diff changeset
230 snprintf(path, sizeof(path), AGENTDIRPREFIX "%.8x", prefix);
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parents:
diff changeset
231
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parents:
diff changeset
232 if (mkdir(path, mode) == 0) {
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parents:
diff changeset
233 goto bindsocket;
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parents:
diff changeset
234 }
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
235 if (errno != EEXIST) {
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parents:
diff changeset
236 break;
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parents:
diff changeset
237 }
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parents:
diff changeset
238 }
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parents:
diff changeset
239 /* couldn't make a dir */
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parents:
diff changeset
240 goto out;
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parents:
diff changeset
241
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parents:
diff changeset
242 bindsocket:
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parents:
diff changeset
243 /* Format is "/tmp/dropbear-0246dead/auth-d00f7654-23".
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parents:
diff changeset
244 * The "23" is the file desc, the random data is to avoid collisions
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parents:
diff changeset
245 * between subsequent user processes reusing socket fds (odds are now
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
246 * 1/(2^64) */
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parents:
diff changeset
247 genrandom((unsigned char*)&prefix, sizeof(prefix));
11
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diff changeset
248 snprintf(sockfile, sizeof(sockfile), "auth-%.8x-%d", prefix, fd);
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parents: 5
diff changeset
249
4
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diff changeset
250 snprintf(addr.sun_path, sizeof(addr.sun_path), "%s/%s", path, sockfile);
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parents:
diff changeset
251
11
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parents: 5
diff changeset
252 if (bind(fd, (struct sockaddr*)&addr, sizeof(addr)) == 0) {
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parents: 5
diff changeset
253 chansess->agentdir = m_strdup(path);
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parents: 5
diff changeset
254 chansess->agentfile = m_strdup(sockfile);
4
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parents:
diff changeset
255 ret = DROPBEAR_SUCCESS;
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parents:
diff changeset
256 }
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parents:
diff changeset
257
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parents:
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258
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parents:
diff changeset
259 out:
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parents:
diff changeset
260 if ((seteuid(uid)) < 0 ||
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parents:
diff changeset
261 (setegid(gid)) < 0) {
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parents:
diff changeset
262 dropbear_exit("failed to revert euid");
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parents:
diff changeset
263 }
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parents:
diff changeset
264 return ret;
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parents:
diff changeset
265 }
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parents:
diff changeset
266
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parents:
diff changeset
267 #endif