Mercurial > dropbear
annotate svr-agentfwd.c @ 1844:7a3cd7b598d8
github action, don't try apt or python on macos
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 18 Oct 2021 23:31:23 +0800 |
parents | a7cc3332d8ab |
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rev | line source |
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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 #if DROPBEAR_SVR_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 "dbrandom.h" |
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41 #include "listener.h" |
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42 #include "auth.h" |
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43 |
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44 #define AGENTDIRPREFIX "/tmp/dropbear-" |
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45 |
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46 static int send_msg_channel_open_agent(int fd); |
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47 static int bindagent(int fd, struct ChanSess * chansess); |
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48 static void agentaccept(const struct Listener * listener, int sock); |
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49 |
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50 /* Handles client requests to start agent forwarding, sets up listening socket. |
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51 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */ |
560 | 52 int svr_agentreq(struct ChanSess * chansess) { |
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53 int fd = -1; |
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55 if (!svr_pubkey_allows_agentfwd()) { |
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56 return DROPBEAR_FAILURE; |
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57 } |
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58 |
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59 if (chansess->agentlistener != NULL) { |
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60 return DROPBEAR_FAILURE; |
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61 } |
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62 |
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63 /* create listening socket */ |
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64 fd = socket(PF_UNIX, SOCK_STREAM, 0); |
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65 if (fd < 0) { |
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66 goto fail; |
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67 } |
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68 |
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69 /* create the unix socket dir and file */ |
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70 if (bindagent(fd, chansess) == DROPBEAR_FAILURE) { |
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71 goto fail; |
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72 } |
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73 |
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74 /* listen */ |
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75 if (listen(fd, 20) < 0) { |
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76 goto fail; |
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77 } |
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78 |
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79 /* set non-blocking */ |
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80 setnonblocking(fd); |
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81 |
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82 /* pass if off to listener */ |
62 | 83 chansess->agentlistener = new_listener( &fd, 1, 0, chansess, |
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84 agentaccept, NULL); |
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85 |
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86 if (chansess->agentlistener == NULL) { |
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87 goto fail; |
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88 } |
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89 |
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90 return DROPBEAR_SUCCESS; |
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91 |
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92 fail: |
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93 m_close(fd); |
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94 /* cleanup */ |
560 | 95 svr_agentcleanup(chansess); |
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96 |
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97 return DROPBEAR_FAILURE; |
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98 } |
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99 |
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100 /* accepts a connection on the forwarded socket and opens a new channel for it |
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101 * back to the client */ |
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102 /* returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */ |
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103 static void agentaccept(const struct Listener *UNUSED(listener), int sock) { |
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104 |
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105 int fd; |
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106 |
62 | 107 fd = accept(sock, NULL, NULL); |
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108 if (fd < 0) { |
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109 TRACE(("accept failed")) |
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110 return; |
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111 } |
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112 |
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113 if (send_msg_channel_open_agent(fd) != DROPBEAR_SUCCESS) { |
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114 close(fd); |
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115 } |
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116 |
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117 } |
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118 |
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119 /* set up the environment variable pointing to the socket. This is called |
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120 * just before command/shell execution, after dropping privileges */ |
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121 void svr_agentset(const struct ChanSess * chansess) { |
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122 |
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123 char *path = NULL; |
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124 int len; |
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125 |
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126 if (chansess->agentlistener == NULL) { |
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127 return; |
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128 } |
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129 |
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130 /* 2 for "/" and "\0" */ |
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131 len = strlen(chansess->agentdir) + strlen(chansess->agentfile) + 2; |
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132 |
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133 path = m_malloc(len); |
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134 snprintf(path, len, "%s/%s", chansess->agentdir, chansess->agentfile); |
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135 addnewvar("SSH_AUTH_SOCK", path); |
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|
136 m_free(path); |
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137 } |
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138 |
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139 /* close the socket, remove the socket-file */ |
560 | 140 void svr_agentcleanup(struct ChanSess * chansess) { |
4
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141 |
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142 char *path = NULL; |
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143 uid_t uid; |
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144 gid_t gid; |
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145 int len; |
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146 |
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147 if (chansess->agentlistener != NULL) { |
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148 remove_listener(chansess->agentlistener); |
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149 chansess->agentlistener = NULL; |
4
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150 } |
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151 |
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Merging in the changes from 0.41-0.43 main Dropbear tree
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152 if (chansess->agentfile != NULL && chansess->agentdir != NULL) { |
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153 |
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154 #if DROPBEAR_SVR_MULTIUSER |
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155 /* Remove the dir as the user. That way they can't cause problems except |
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156 * for themselves */ |
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157 uid = getuid(); |
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158 gid = getgid(); |
464
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159 if ((setegid(ses.authstate.pw_gid)) < 0 || |
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160 (seteuid(ses.authstate.pw_uid)) < 0) { |
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161 dropbear_exit("Failed to set euid"); |
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162 } |
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163 #endif |
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164 |
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165 /* 2 for "/" and "\0" */ |
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166 len = strlen(chansess->agentdir) + strlen(chansess->agentfile) + 2; |
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167 |
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168 path = m_malloc(len); |
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169 snprintf(path, len, "%s/%s", chansess->agentdir, chansess->agentfile); |
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170 unlink(path); |
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171 m_free(path); |
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172 |
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173 rmdir(chansess->agentdir); |
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174 |
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175 #if DROPBEAR_SVR_MULTIUSER |
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176 if ((seteuid(uid)) < 0 || |
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177 (setegid(gid)) < 0) { |
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178 dropbear_exit("Failed to revert euid"); |
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179 } |
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180 #endif |
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181 |
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182 m_free(chansess->agentfile); |
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183 m_free(chansess->agentdir); |
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184 } |
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185 |
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186 } |
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187 |
225
ca7e76d981d9
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188 static const struct ChanType chan_svr_agent = { |
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189 "[email protected]", |
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190 NULL, |
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191 NULL, |
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192 NULL, |
1625
79eef94ccea9
Split ChanType closehandler() and cleanup() so that dbclient doesn't
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193 NULL, |
11
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194 NULL |
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195 }; |
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196 |
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197 |
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198 /* helper for accepting an agent request */ |
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199 static int send_msg_channel_open_agent(int fd) { |
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200 |
225
ca7e76d981d9
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201 if (send_msg_channel_open_init(fd, &chan_svr_agent) == DROPBEAR_SUCCESS) { |
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202 encrypt_packet(); |
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203 return DROPBEAR_SUCCESS; |
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204 } else { |
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205 return DROPBEAR_FAILURE; |
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|
206 } |
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207 } |
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208 |
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209 /* helper for creating the agent socket-file |
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210 returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */ |
11
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|
211 static int bindagent(int fd, struct ChanSess * chansess) { |
4
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212 |
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|
213 struct sockaddr_un addr; |
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|
214 unsigned int prefix; |
1631
292f79307600
fix some gcc warnings (#73)
François Perrad <francois.perrad@gadz.org>
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1625
diff
changeset
|
215 char path[(sizeof(addr.sun_path)-1)/2], sockfile[(sizeof(addr.sun_path)-1)/2]; |
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|
216 mode_t mode; |
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|
217 int i; |
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218 uid_t uid; |
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219 gid_t gid; |
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220 int ret = DROPBEAR_FAILURE; |
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221 |
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222 #if DROPBEAR_SVR_MULTIUSER |
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223 /* drop to user privs to make the dir/file */ |
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224 uid = getuid(); |
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225 gid = getgid(); |
464
4317be8b7cf9
Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
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165
diff
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226 if ((setegid(ses.authstate.pw_gid)) < 0 || |
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Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
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165
diff
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227 (seteuid(ses.authstate.pw_uid)) < 0) { |
594
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Improve capitalisation for all logged strings
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diff
changeset
|
228 dropbear_exit("Failed to set euid"); |
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229 } |
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230 #endif |
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231 |
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232 memset((void*)&addr, 0x0, sizeof(addr)); |
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233 addr.sun_family = AF_UNIX; |
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234 |
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235 mode = S_IRWXU; |
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|
236 |
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|
237 for (i = 0; i < 20; i++) { |
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|
238 genrandom((unsigned char*)&prefix, sizeof(prefix)); |
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239 /* we want 32 bits (8 hex digits) - "/tmp/dropbear-f19c62c0" */ |
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240 snprintf(path, sizeof(path), AGENTDIRPREFIX "%.8x", prefix); |
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|
241 |
fe6bca95afa7
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|
242 if (mkdir(path, mode) == 0) { |
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changeset
|
243 goto bindsocket; |
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|
244 } |
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|
245 if (errno != EEXIST) { |
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changeset
|
246 break; |
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|
247 } |
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|
248 } |
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249 /* couldn't make a dir */ |
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|
250 goto out; |
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|
251 |
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|
252 bindsocket: |
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253 /* Format is "/tmp/dropbear-0246dead/auth-d00f7654-23". |
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254 * The "23" is the file desc, the random data is to avoid collisions |
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255 * between subsequent user processes reusing socket fds (odds are now |
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changeset
|
256 * 1/(2^64) */ |
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changeset
|
257 genrandom((unsigned char*)&prefix, sizeof(prefix)); |
11
f76c9389e9e0
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changeset
|
258 snprintf(sockfile, sizeof(sockfile), "auth-%.8x-%d", prefix, fd); |
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|
259 |
4
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|
260 snprintf(addr.sun_path, sizeof(addr.sun_path), "%s/%s", path, sockfile); |
fe6bca95afa7
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changeset
|
261 |
11
f76c9389e9e0
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5
diff
changeset
|
262 if (bind(fd, (struct sockaddr*)&addr, sizeof(addr)) == 0) { |
f76c9389e9e0
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Matt Johnston <matt@ucc.asn.au>
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263 chansess->agentdir = m_strdup(path); |
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264 chansess->agentfile = m_strdup(sockfile); |
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265 ret = DROPBEAR_SUCCESS; |
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266 } |
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267 |
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268 |
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269 out: |
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270 #if DROPBEAR_SVR_MULTIUSER |
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271 if ((seteuid(uid)) < 0 || |
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272 (setegid(gid)) < 0) { |
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273 dropbear_exit("Failed to revert euid"); |
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274 } |
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275 #endif |
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276 return ret; |
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277 } |
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278 |
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279 #endif |