Mercurial > dropbear

annotate svr-chansession.c @ 359:78518751cb82 channel-fix

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just shuffle some variables names about, a brief comment about the "bad writefd" problem
author Matt Johnston <matt@ucc.asn.au>
date Sun, 01 Oct 2006 16:35:13 +0000
parents 01e4180895ba
children 1c7bf9cec6c8
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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 #include "includes.h"
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26 #include "packet.h"
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27 #include "buffer.h"
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28 #include "session.h"
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29 #include "dbutil.h"
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30 #include "channel.h"
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31 #include "chansession.h"
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32 #include "sshpty.h"
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33 #include "termcodes.h"
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34 #include "ssh.h"
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35 #include "random.h"
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36 #include "utmp.h"
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37 #include "x11fwd.h"
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38 #include "agentfwd.h"
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39 #include "runopts.h"
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40
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41 /* Handles sessions (either shells or programs) requested by the client */
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42
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43 static int sessioncommand(struct Channel *channel, struct ChanSess *chansess,
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44 int iscmd, int issubsys);
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45 static int sessionpty(struct ChanSess * chansess);
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46 static int sessionsignal(struct ChanSess *chansess);
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47 static int noptycommand(struct Channel *channel, struct ChanSess *chansess);
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48 static int ptycommand(struct Channel *channel, struct ChanSess *chansess);
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49 static int sessionwinchange(struct ChanSess *chansess);
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50 static void execchild(struct ChanSess *chansess);
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51 static void addchildpid(struct ChanSess *chansess, pid_t pid);
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52 static void sesssigchild_handler(int val);
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53 static void closechansess(struct Channel *channel);
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54 static int newchansess(struct Channel *channel);
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55 static void chansessionrequest(struct Channel *channel);
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56
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57 static void send_exitsignalstatus(struct Channel *channel);
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58 static void send_msg_chansess_exitstatus(struct Channel * channel,
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59 struct ChanSess * chansess);
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60 static void send_msg_chansess_exitsignal(struct Channel * channel,
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61 struct ChanSess * chansess);
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62 static int sess_check_close(struct Channel *channel);
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63 static void get_termmodes(struct ChanSess *chansess);
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66 /* required to clear environment */
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67 extern char** environ;
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68
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69 static int sess_check_close(struct Channel *channel) {
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70 return channel->writefd == -1;
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71 }
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73 /* Handler for childs exiting, store the state for return to the client */
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74
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75 /* There's a particular race we have to watch out for: if the forked child
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76 * executes, exits, and this signal-handler is called, all before the parent
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77 * gets to run, then the childpids[] array won't have the pid in it. Hence we
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78 * use the svr_ses.lastexit struct to hold the exit, which is then compared by
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79 * the parent when it runs. This work correctly at least in the case of a
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80 * single shell spawned (ie the usual case) */
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81 static void sesssigchild_handler(int UNUSED(dummy)) {
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82
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83 int status;
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84 pid_t pid;
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85 unsigned int i;
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86 struct sigaction sa_chld;
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87 struct exitinfo *exit = NULL;
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88
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89 TRACE(("enter sigchld handler"))
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90 while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
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91
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92 exit = NULL;
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93 /* find the corresponding chansess */
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94 for (i = 0; i < svr_ses.childpidsize; i++) {
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95 if (svr_ses.childpids[i].pid == pid) {
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96
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97 exit = &svr_ses.childpids[i].chansess->exit;
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98 break;
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99 }
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100 }
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101
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102 /* If the pid wasn't matched, then we might have hit the race mentioned
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103 * above. So we just store the info for the parent to deal with */
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104 if (!exit) {
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105 exit = &svr_ses.lastexit;
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106 }
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107
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108 exit->exitpid = pid;
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109 if (WIFEXITED(status)) {
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110 exit->exitstatus = WEXITSTATUS(status);
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111 }
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112 if (WIFSIGNALED(status)) {
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113 exit->exitsignal = WTERMSIG(status);
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114 #if !defined(AIX) && defined(WCOREDUMP)
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115 exit->exitcore = WCOREDUMP(status);
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116 #else
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117 exit->exitcore = 0;
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118 #endif
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119 } else {
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120 /* we use this to determine how pid exited */
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121 exit->exitsignal = -1;
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122 }
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123 }
130
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124
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125
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126 sa_chld.sa_handler = sesssigchild_handler;
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127 sa_chld.sa_flags = SA_NOCLDSTOP;
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128 sigaction(SIGCHLD, &sa_chld, NULL);
165
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129 TRACE(("leave sigchld handler"))
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130 }
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131
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132 /* send the exit status or the signal causing termination for a session */
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133 /* XXX server */
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134 static void send_exitsignalstatus(struct Channel *channel) {
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135
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136 struct ChanSess *chansess = (struct ChanSess*)channel->typedata;
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137
130
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138 if (chansess->exit.exitpid >= 0) {
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139 if (chansess->exit.exitsignal > 0) {
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140 send_msg_chansess_exitsignal(channel, chansess);
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141 } else {
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142 send_msg_chansess_exitstatus(channel, chansess);
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143 }
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144 }
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145 }
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146
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147 /* send the exitstatus to the client */
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148 static void send_msg_chansess_exitstatus(struct Channel * channel,
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149 struct ChanSess * chansess) {
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150
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151 dropbear_assert(chansess->exit.exitpid != -1);
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152 dropbear_assert(chansess->exit.exitsignal == -1);
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153
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154 CHECKCLEARTOWRITE();
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155
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156 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_REQUEST);
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157 buf_putint(ses.writepayload, channel->remotechan);
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158 buf_putstring(ses.writepayload, "exit-status", 11);
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159 buf_putbyte(ses.writepayload, 0); /* boolean FALSE */
130
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160 buf_putint(ses.writepayload, chansess->exit.exitstatus);
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161
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162 encrypt_packet();
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163
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164 }
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165
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166 /* send the signal causing the exit to the client */
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167 static void send_msg_chansess_exitsignal(struct Channel * channel,
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168 struct ChanSess * chansess) {
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169
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170 int i;
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171 char* signame = NULL;
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172
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173 dropbear_assert(chansess->exit.exitpid != -1);
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174 dropbear_assert(chansess->exit.exitsignal > 0);
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175
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176 CHECKCLEARTOWRITE();
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177
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178 /* we check that we can match a signal name, otherwise
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179 * don't send anything */
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180 for (i = 0; signames[i].name != NULL; i++) {
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181 if (signames[i].signal == chansess->exit.exitsignal) {
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182 signame = signames[i].name;
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183 break;
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184 }
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185 }
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186
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187 if (signame == NULL) {
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188 return;
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189 }
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190
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191 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_REQUEST);
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192 buf_putint(ses.writepayload, channel->remotechan);
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193 buf_putstring(ses.writepayload, "exit-signal", 11);
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194 buf_putbyte(ses.writepayload, 0); /* boolean FALSE */
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195 buf_putstring(ses.writepayload, signame, strlen(signame));
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196 buf_putbyte(ses.writepayload, chansess->exit.exitcore);
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197 buf_putstring(ses.writepayload, "", 0); /* error msg */
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198 buf_putstring(ses.writepayload, "", 0); /* lang */
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199
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200 encrypt_packet();
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201 }
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202
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203 /* set up a session channel */
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204 static int newchansess(struct Channel *channel) {
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205
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206 struct ChanSess *chansess;
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207
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208 dropbear_assert(channel->typedata == NULL);
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209
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210 chansess = (struct ChanSess*)m_malloc(sizeof(struct ChanSess));
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211 chansess->cmd = NULL;
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212 chansess->pid = 0;
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213
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214 /* pty details */
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215 chansess->master = -1;
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216 chansess->slave = -1;
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217 chansess->tty = NULL;
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218 chansess->term = NULL;
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219
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220 chansess->exit.exitpid = -1;
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221
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222 channel->typedata = chansess;
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223
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224 #ifndef DISABLE_X11FWD
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225 chansess->x11listener = NULL;
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226 chansess->x11authprot = NULL;
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227 chansess->x11authcookie = NULL;
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228 #endif
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229
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230 #ifndef DISABLE_AGENTFWD
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231 chansess->agentlistener = NULL;
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232 chansess->agentfile = NULL;
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233 chansess->agentdir = NULL;
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234 #endif
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235
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236 return 0;
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237
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238 }
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239
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240 /* clean a session channel */
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241 static void closechansess(struct Channel *channel) {
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242
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243 struct ChanSess *chansess;
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244 unsigned int i;
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245 struct logininfo *li;
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246
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247 chansess = (struct ChanSess*)channel->typedata;
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248
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249 send_exitsignalstatus(channel);
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250
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251 TRACE(("enter closechansess"))
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252 if (chansess == NULL) {
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253 TRACE(("leave closechansess: chansess == NULL"))
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254 return;
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diff changeset
255 }
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diff changeset
256
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diff changeset
257 m_free(chansess->cmd);
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diff changeset
258 m_free(chansess->term);
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259
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parents:
diff changeset
260 if (chansess->tty) {
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diff changeset
261 /* write the utmp/wtmp login record */
33
f789045062e6 Progressing client support
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parents: 24
diff changeset
262 li = login_alloc_entry(chansess->pid, ses.authstate.username,
4
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diff changeset
263 ses.remotehost, chansess->tty);
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parents:
diff changeset
264 login_logout(li);
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diff changeset
265 login_free_entry(li);
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266
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267 pty_release(chansess->tty);
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268 m_free(chansess->tty);
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269 }
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270
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parents:
diff changeset
271 #ifndef DISABLE_X11FWD
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diff changeset
272 x11cleanup(chansess);
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273 #endif
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274
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275 #ifndef DISABLE_AGENTFWD
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276 agentcleanup(chansess);
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277 #endif
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278
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parents:
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279 /* clear child pid entries */
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diff changeset
280 for (i = 0; i < svr_ses.childpidsize; i++) {
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281 if (svr_ses.childpids[i].chansess == chansess) {
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 208
diff changeset
282 dropbear_assert(svr_ses.childpids[i].pid > 0);
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
283 TRACE(("closing pid %d", svr_ses.childpids[i].pid))
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parents: 133
diff changeset
284 TRACE(("exitpid = %d", chansess->exit.exitpid))
4
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285 svr_ses.childpids[i].pid = -1;
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286 svr_ses.childpids[i].chansess = NULL;
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287 }
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288 }
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289
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290 m_free(chansess);
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291
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
292 TRACE(("leave closechansess"))
4
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293 }
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294
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parents:
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295 /* Handle requests for a channel. These can be execution requests,
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parents:
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296 * or x11/authagent forwarding. These are passed to appropriate handlers */
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297 static void chansessionrequest(struct Channel *channel) {
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298
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
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parents: 62
diff changeset
299 unsigned char * type = NULL;
4
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parents:
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300 unsigned int typelen;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
301 unsigned char wantreply;
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parents:
diff changeset
302 int ret = 1;
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parents:
diff changeset
303 struct ChanSess *chansess;
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304
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 133
diff changeset
305 TRACE(("enter chansessionrequest"))
4
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306
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parents:
diff changeset
307 type = buf_getstring(ses.payload, &typelen);
179
161557a9dde8 * fix longstanding bug with connections being closed on failure to
Matt Johnston <matt@ucc.asn.au>
parents: 171
diff changeset
308 wantreply = buf_getbool(ses.payload);
4
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309
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parents:
diff changeset
310 if (typelen > MAX_NAME_LEN) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
311 TRACE(("leave chansessionrequest: type too long")) /* XXX send error?*/
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
312 goto out;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
313 }
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parents:
diff changeset
314
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
315 chansess = (struct ChanSess*)channel->typedata;
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 208
diff changeset
316 dropbear_assert(chansess != NULL);
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
317 TRACE(("type is %s", type))
4
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318
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parents:
diff changeset
319 if (strcmp(type, "window-change") == 0) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
320 ret = sessionwinchange(chansess);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
321 } else if (strcmp(type, "shell") == 0) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
322 ret = sessioncommand(channel, chansess, 0, 0);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
323 } else if (strcmp(type, "pty-req") == 0) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
324 ret = sessionpty(chansess);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
325 } else if (strcmp(type, "exec") == 0) {
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parents:
diff changeset
326 ret = sessioncommand(channel, chansess, 1, 0);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
327 } else if (strcmp(type, "subsystem") == 0) {
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parents:
diff changeset
328 ret = sessioncommand(channel, chansess, 1, 1);
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parents:
diff changeset
329 #ifndef DISABLE_X11FWD
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parents:
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330 } else if (strcmp(type, "x11-req") == 0) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
331 ret = x11req(chansess);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
332 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
333 #ifndef DISABLE_AGENTFWD
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parents:
diff changeset
334 } else if (strcmp(type, "[email protected]") == 0) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
335 ret = agentreq(chansess);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
336 #endif
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parents:
diff changeset
337 } else if (strcmp(type, "signal") == 0) {
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parents:
diff changeset
338 ret = sessionsignal(chansess);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
339 } else {
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parents:
diff changeset
340 /* etc, todo "env", "subsystem" */
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parents:
diff changeset
341 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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342
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
343 out:
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parents:
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344
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
345 if (wantreply) {
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
346 if (ret == DROPBEAR_SUCCESS) {
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
347 send_msg_channel_success(channel);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
348 } else {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
349 send_msg_channel_failure(channel);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
350 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
351 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
352
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
353 m_free(type);
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
354 TRACE(("leave chansessionrequest"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
355 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
356
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
357
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
358 /* Send a signal to a session's process as requested by the client*/
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
359 static int sessionsignal(struct ChanSess *chansess) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
360
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
361 int sig = 0;
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
362 unsigned char* signame = NULL;
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
363 int i;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
364
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
365 if (chansess->pid == 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
366 /* haven't got a process pid yet */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
367 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
368 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
369
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
370 signame = buf_getstring(ses.payload, NULL);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
371
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
372 i = 0;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
373 while (signames[i].name != 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
374 if (strcmp(signames[i].name, signame) == 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
375 sig = signames[i].signal;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
376 break;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
377 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
378 i++;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
379 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
380
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
381 m_free(signame);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
382
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
383 if (sig == 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
384 /* failed */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
385 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
386 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
387
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
388 if (kill(chansess->pid, sig) < 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
389 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
390 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
391
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
392 return DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
393 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
394
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
395 /* Let the process know that the window size has changed, as notified from the
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
396 * client. Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
397 static int sessionwinchange(struct ChanSess *chansess) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
398
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
399 int termc, termr, termw, termh;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
400
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
401 if (chansess->master < 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
402 /* haven't got a pty yet */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
403 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
404 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
405
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
406 termc = buf_getint(ses.payload);
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
407 termr = buf_getint(ses.payload);
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
408 termw = buf_getint(ses.payload);
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
409 termh = buf_getint(ses.payload);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
410
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
411 pty_change_window_size(chansess->master, termr, termc, termw, termh);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
412
315
3eea61bd9993 send success message for successful window change request
Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
413 return DROPBEAR_SUCCESS;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
414 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
415
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
416 static void get_termmodes(struct ChanSess *chansess) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
417
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
418 struct termios termio;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
419 unsigned char opcode;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
420 unsigned int value;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
421 const struct TermCode * termcode;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
422 unsigned int len;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
423
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
424 TRACE(("enter get_termmodes"))
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
425
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
426 /* Term modes */
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
427 /* We'll ignore errors and continue if we can't set modes.
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
428 * We're ignoring baud rates since they seem evil */
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
429 if (tcgetattr(chansess->master, &termio) == -1) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
430 return;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
431 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
432
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
433 len = buf_getint(ses.payload);
62
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
434 TRACE(("term mode str %d p->l %d p->p %d",
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
435 len, ses.payload->len , ses.payload->pos));
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
436 if (len != ses.payload->len - ses.payload->pos) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
437 dropbear_exit("bad term mode string");
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
438 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
439
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
440 if (len == 0) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
441 TRACE(("leave get_termmodes: empty terminal modes string"))
171
8e68dbe8687b put back 'return;' on empty terminal mode strings which was erroneously
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
442 return;
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
443 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
444
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
445 while (((opcode = buf_getbyte(ses.payload)) != 0x00) && opcode <= 159) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
446
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
447 /* must be before checking type, so that value is consumed even if
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
448 * we don't use it */
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
449 value = buf_getint(ses.payload);
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
450
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
451 /* handle types of code */
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
452 if (opcode > MAX_TERMCODE) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
453 continue;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
454 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
455 termcode = &termcodes[(unsigned int)opcode];
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
456
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
457
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
458 switch (termcode->type) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
459
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
460 case TERMCODE_NONE:
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
461 break;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
462
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
463 case TERMCODE_CONTROLCHAR:
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
464 termio.c_cc[termcode->mapcode] = value;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
465 break;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
466
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
467 case TERMCODE_INPUT:
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
468 if (value) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
469 termio.c_iflag |= termcode->mapcode;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
470 } else {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
471 termio.c_iflag &= ~(termcode->mapcode);
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
472 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
473 break;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
474
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
475 case TERMCODE_OUTPUT:
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
476 if (value) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
477 termio.c_oflag |= termcode->mapcode;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
478 } else {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
479 termio.c_oflag &= ~(termcode->mapcode);
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
480 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
481 break;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
482
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
483 case TERMCODE_LOCAL:
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
484 if (value) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
485 termio.c_lflag |= termcode->mapcode;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
486 } else {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
487 termio.c_lflag &= ~(termcode->mapcode);
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
488 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
489 break;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
490
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
491 case TERMCODE_CONTROL:
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
492 if (value) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
493 termio.c_cflag |= termcode->mapcode;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
494 } else {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
495 termio.c_cflag &= ~(termcode->mapcode);
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
496 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
497 break;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
498
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
499 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
500 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
501 if (tcsetattr(chansess->master, TCSANOW, &termio) < 0) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
502 dropbear_log(LOG_INFO, "error setting terminal attributes");
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
503 }
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
504 TRACE(("leave get_termmodes"))
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
505 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
506
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
507 /* Set up a session pty which will be used to execute the shell or program.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
508 * The pty is allocated now, and kept for when the shell/program executes.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
509 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
510 static int sessionpty(struct ChanSess * chansess) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
511
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
512 unsigned int termlen;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
513 unsigned char namebuf[65];
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
514
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
515 TRACE(("enter sessionpty"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
516 chansess->term = buf_getstring(ses.payload, &termlen);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
517 if (termlen > MAX_TERM_LEN) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
518 /* TODO send disconnect ? */
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
519 TRACE(("leave sessionpty: term len too long"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
520 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
521 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
522
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
523 /* allocate the pty */
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents: 96
diff changeset
524 if (chansess->master != -1) {
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents: 96
diff changeset
525 dropbear_exit("multiple pty requests");
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents: 96
diff changeset
526 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
527 if (pty_allocate(&chansess->master, &chansess->slave, namebuf, 64) == 0) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
528 TRACE(("leave sessionpty: failed to allocate pty"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
529 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
530 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
531
11
f76c9389e9e0 Mostly done with the listener changeover
Matt Johnston <matt@ucc.asn.au>
parents: 9
diff changeset
532 chansess->tty = (char*)m_strdup(namebuf);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
533 if (!chansess->tty) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
534 dropbear_exit("out of memory"); /* TODO disconnect */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
535 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
536
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
537 pty_setowner(ses.authstate.pw, chansess->tty);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
538
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
539 /* Set up the rows/col counts */
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
540 sessionwinchange(chansess);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
541
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
542 /* Read the terminal modes */
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
543 get_termmodes(chansess);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
544
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
545 TRACE(("leave sessionpty"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
546 return DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
547 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
548
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
549 /* Handle a command request from the client. This is used for both shell
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
550 * and command-execution requests, and passes the command to
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
551 * noptycommand or ptycommand as appropriate.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
552 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
553 static int sessioncommand(struct Channel *channel, struct ChanSess *chansess,
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parents:
diff changeset
554 int iscmd, int issubsys) {
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555
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556 unsigned int cmdlen;
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
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diff changeset
557 int ret;
4
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558
165
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559 TRACE(("enter sessioncommand"))
4
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560
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diff changeset
561 if (chansess->cmd != NULL) {
70
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parents: 62
diff changeset
562 /* Note that only one command can _succeed_. The client might try
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
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parents: 62
diff changeset
563 * one command (which fails), then try another. Ie fallback
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parents: 62
diff changeset
564 * from sftp to scp */
4
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565 return DROPBEAR_FAILURE;
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566 }
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parents:
diff changeset
567
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parents:
diff changeset
568 if (iscmd) {
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parents:
diff changeset
569 /* "exec" */
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diff changeset
570 chansess->cmd = buf_getstring(ses.payload, &cmdlen);
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571
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572 if (cmdlen > MAX_CMD_LEN) {
70
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diff changeset
573 m_free(chansess->cmd);
4
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574 /* TODO - send error - too long ? */
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575 return DROPBEAR_FAILURE;
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576 }
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diff changeset
577 if (issubsys) {
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diff changeset
578 #ifdef SFTPSERVER_PATH
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diff changeset
579 if ((cmdlen == 4) && strncmp(chansess->cmd, "sftp", 4) == 0) {
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580 m_free(chansess->cmd);
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parents: 9
diff changeset
581 chansess->cmd = m_strdup(SFTPSERVER_PATH);
4
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parents:
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582 } else
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parents:
diff changeset
583 #endif
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parents:
diff changeset
584 {
70
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parents: 62
diff changeset
585 m_free(chansess->cmd);
4
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parents:
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586 return DROPBEAR_FAILURE;
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parents:
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587 }
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Matt Johnston <matt@ucc.asn.au>
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588 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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589 }
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Matt Johnston <matt@ucc.asn.au>
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590
349
dba106bf6b34 Add (disabled by default) LOG_COMMANDS option to log the commands executed
Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
591 #ifdef LOG_COMMANDS
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Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
592 if (chansess->cmd) {
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Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
593 dropbear_log(LOG_INFO, "user %s executing '%s'",
dba106bf6b34 Add (disabled by default) LOG_COMMANDS option to log the commands executed
Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
594 ses.authstate.printableuser, chansess->cmd);
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Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
595 } else {
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Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
596 dropbear_log(LOG_INFO, "user %s executing login shell",
dba106bf6b34 Add (disabled by default) LOG_COMMANDS option to log the commands executed
Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
597 ses.authstate.printableuser);
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Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
598 }
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Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
599 #endif
dba106bf6b34 Add (disabled by default) LOG_COMMANDS option to log the commands executed
Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
600
4
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parents:
diff changeset
601 if (chansess->term == NULL) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
602 /* no pty */
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
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parents: 62
diff changeset
603 ret = noptycommand(channel, chansess);
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
604 } else {
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parents:
diff changeset
605 /* want pty */
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
606 ret = ptycommand(channel, chansess);
4
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parents:
diff changeset
607 }
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
608
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
609 if (ret == DROPBEAR_FAILURE) {
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
610 m_free(chansess->cmd);
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parents: 62
diff changeset
611 }
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Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
612 return ret;
4
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parents:
diff changeset
613 }
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parents:
diff changeset
614
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parents:
diff changeset
615 /* Execute a command and set up redirection of stdin/stdout/stderr without a
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
616 * pty.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
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diff changeset
617 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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diff changeset
618 static int noptycommand(struct Channel *channel, struct ChanSess *chansess) {
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diff changeset
619
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diff changeset
620 int infds[2];
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diff changeset
621 int outfds[2];
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diff changeset
622 int errfds[2];
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diff changeset
623 pid_t pid;
130
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diff changeset
624 unsigned int i;
4
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625
165
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diff changeset
626 TRACE(("enter noptycommand"))
4
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parents:
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627
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
628 /* redirect stdin/stdout/stderr */
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parents:
diff changeset
629 if (pipe(infds) != 0)
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diff changeset
630 return DROPBEAR_FAILURE;
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parents:
diff changeset
631 if (pipe(outfds) != 0)
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parents:
diff changeset
632 return DROPBEAR_FAILURE;
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parents:
diff changeset
633 if (pipe(errfds) != 0)
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parents:
diff changeset
634 return DROPBEAR_FAILURE;
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635
273
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parents: 264
diff changeset
636 #ifdef __uClinux__
02a80ce2ead4 Merge of the uClinux-dist patch, should work in inetd mode
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parents: 264
diff changeset
637 pid = vfork();
02a80ce2ead4 Merge of the uClinux-dist patch, should work in inetd mode
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parents: 264
diff changeset
638 #else
4
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639 pid = fork();
273
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parents: 264
diff changeset
640 #endif
02a80ce2ead4 Merge of the uClinux-dist patch, should work in inetd mode
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parents: 264
diff changeset
641
4
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diff changeset
642 if (pid < 0)
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
643 return DROPBEAR_FAILURE;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
644
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parents:
diff changeset
645 if (!pid) {
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
646 /* child */
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
647
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
648 /* redirect stdin/stdout */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
649 #define FDIN 0
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parents:
diff changeset
650 #define FDOUT 1
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parents:
diff changeset
651 if ((dup2(infds[FDIN], STDIN_FILENO) < 0) ||
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parents:
diff changeset
652 (dup2(outfds[FDOUT], STDOUT_FILENO) < 0) ||
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parents:
diff changeset
653 (dup2(errfds[FDOUT], STDERR_FILENO) < 0)) {
165
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Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
654 TRACE(("leave noptycommand: error redirecting FDs"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
655 return DROPBEAR_FAILURE;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
656 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
657
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
658 close(infds[FDOUT]);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
659 close(infds[FDIN]);
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parents:
diff changeset
660 close(outfds[FDIN]);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
661 close(outfds[FDOUT]);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
662 close(errfds[FDIN]);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
663 close(errfds[FDOUT]);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
664
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parents:
diff changeset
665 execchild(chansess);
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parents:
diff changeset
666 /* not reached */
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parents:
diff changeset
667
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parents:
diff changeset
668 } else {
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parents:
diff changeset
669 /* parent */
165
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Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
670 TRACE(("continue noptycommand: parent"))
4
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parents:
diff changeset
671 chansess->pid = pid;
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parents:
diff changeset
672
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
673 addchildpid(chansess, pid);
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parents:
diff changeset
674
130
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parents: 115
diff changeset
675 if (svr_ses.lastexit.exitpid != -1) {
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Matt Johnston <matt@ucc.asn.au>
parents: 115
diff changeset
676 /* The child probably exited and the signal handler triggered
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Matt Johnston <matt@ucc.asn.au>
parents: 115
diff changeset
677 * possibly before we got around to adding the childpid. So we fill
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parents: 115
diff changeset
678 * out it's data manually */
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Matt Johnston <matt@ucc.asn.au>
parents: 115
diff changeset
679 for (i = 0; i < svr_ses.childpidsize; i++) {
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Matt Johnston <matt@ucc.asn.au>
parents: 115
diff changeset
680 if (svr_ses.childpids[i].pid == pid) {
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Matt Johnston <matt@ucc.asn.au>
parents: 115
diff changeset
681 svr_ses.childpids[i].chansess->exit = svr_ses.lastexit;
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parents: 115
diff changeset
682 svr_ses.lastexit.exitpid = -1;
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Matt Johnston <matt@ucc.asn.au>
parents: 115
diff changeset
683 }
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parents: 115
diff changeset
684 }
154c8d5a6d1e propagate of 82bb923d0154750ef716b66b498561f882891946 and f51a272341ee12268fe7028bc2f2bad66c603069 from branch 'matt.dbclient.work' to 'matt.dbclient.rez'
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parents: 115
diff changeset
685 }
154c8d5a6d1e propagate of 82bb923d0154750ef716b66b498561f882891946 and f51a272341ee12268fe7028bc2f2bad66c603069 from branch 'matt.dbclient.work' to 'matt.dbclient.rez'
Matt Johnston <matt@ucc.asn.au>
parents: 115
diff changeset
686
154c8d5a6d1e propagate of 82bb923d0154750ef716b66b498561f882891946 and f51a272341ee12268fe7028bc2f2bad66c603069 from branch 'matt.dbclient.work' to 'matt.dbclient.rez'
Matt Johnston <matt@ucc.asn.au>
parents: 115
diff changeset
687
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
688 close(infds[FDIN]);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
689 close(outfds[FDOUT]);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
690 close(errfds[FDOUT]);
253
84925eceeb13 * rename infd/outfd to writefd/readfd, to avoid confusion
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
691 channel->writefd = infds[FDOUT];
84925eceeb13 * rename infd/outfd to writefd/readfd, to avoid confusion
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
692 channel->readfd = outfds[FDIN];
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
693 channel->errfd = errfds[FDIN];
253
84925eceeb13 * rename infd/outfd to writefd/readfd, to avoid confusion
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
694 ses.maxfd = MAX(ses.maxfd, channel->writefd);
84925eceeb13 * rename infd/outfd to writefd/readfd, to avoid confusion
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
695 ses.maxfd = MAX(ses.maxfd, channel->readfd);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
696 ses.maxfd = MAX(ses.maxfd, channel->errfd);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
697
253
84925eceeb13 * rename infd/outfd to writefd/readfd, to avoid confusion
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
698 setnonblocking(channel->readfd);
84925eceeb13 * rename infd/outfd to writefd/readfd, to avoid confusion
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
699 setnonblocking(channel->writefd);
109
2e9d1f29c50f merge of 50be59810e462f9f44f55e421227d6aa0b31982b
Matt Johnston <matt@ucc.asn.au>
parents: 108
diff changeset
700 setnonblocking(channel->errfd);
2e9d1f29c50f merge of 50be59810e462f9f44f55e421227d6aa0b31982b
Matt Johnston <matt@ucc.asn.au>
parents: 108
diff changeset
701
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
702 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
703 #undef FDIN
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
704 #undef FDOUT
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
705
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
706 TRACE(("leave noptycommand"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
707 return DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
708 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
709
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
710 /* Execute a command or shell within a pty environment, and set up
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
711 * redirection as appropriate.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
712 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
713 static int ptycommand(struct Channel *channel, struct ChanSess *chansess) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
714
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
715 pid_t pid;
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
716 struct logininfo *li = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
717 #ifdef DO_MOTD
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
718 buffer * motdbuf = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
719 int len;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
720 struct stat sb;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
721 char *hushpath = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
722 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
723
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
724 TRACE(("enter ptycommand"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
725
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
726 /* we need to have a pty allocated */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
727 if (chansess->master == -1 || chansess->tty == NULL) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
728 dropbear_log(LOG_WARNING, "no pty was allocated, couldn't execute");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
729 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
730 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
731
273
02a80ce2ead4 Merge of the uClinux-dist patch, should work in inetd mode
Matt Johnston <matt@ucc.asn.au>
parents: 264
diff changeset
732 #ifdef __uClinux__
02a80ce2ead4 Merge of the uClinux-dist patch, should work in inetd mode
Matt Johnston <matt@ucc.asn.au>
parents: 264
diff changeset
733 pid = vfork();
02a80ce2ead4 Merge of the uClinux-dist patch, should work in inetd mode
Matt Johnston <matt@ucc.asn.au>
parents: 264
diff changeset
734 #else
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
735 pid = fork();
273
02a80ce2ead4 Merge of the uClinux-dist patch, should work in inetd mode
Matt Johnston <matt@ucc.asn.au>
parents: 264
diff changeset
736 #endif
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
737 if (pid < 0)
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
738 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
739
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
740 if (pid == 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
741 /* child */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
742
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
743 /* redirect stdin/stdout/stderr */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
744 close(chansess->master);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
745
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
746 pty_make_controlling_tty(&chansess->slave, chansess->tty);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
747
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
748 if ((dup2(chansess->slave, STDIN_FILENO) < 0) ||
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
749 (dup2(chansess->slave, STDERR_FILENO) < 0) ||
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
750 (dup2(chansess->slave, STDOUT_FILENO) < 0)) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
751 TRACE(("leave ptycommand: error redirecting filedesc"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
752 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
753 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
754
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
755 close(chansess->slave);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
756
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
757 /* write the utmp/wtmp login record - must be after changing the
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
758 * terminal used for stdout with the dup2 above */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
759 li= login_alloc_entry(getpid(), ses.authstate.username,
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
760 ses.remotehost, chansess->tty);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
761 login_login(li);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
762 login_free_entry(li);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
763
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
764 m_free(chansess->tty);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
765
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
766 #ifdef DO_MOTD
24
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 11
diff changeset
767 if (svr_opts.domotd) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
768 /* don't show the motd if ~/.hushlogin exists */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
769
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
770 /* 11 == strlen("/hushlogin\0") */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
771 len = strlen(ses.authstate.pw->pw_dir) + 11;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
772
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
773 hushpath = m_malloc(len);
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
774 snprintf(hushpath, len, "%s/hushlogin", ses.authstate.pw->pw_dir);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
775
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
776 if (stat(hushpath, &sb) < 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
777 /* more than a screenful is stupid IMHO */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
778 motdbuf = buf_new(80 * 25);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
779 if (buf_readfile(motdbuf, MOTD_FILENAME) == DROPBEAR_SUCCESS) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
780 buf_setpos(motdbuf, 0);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
781 while (motdbuf->pos != motdbuf->len) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
782 len = motdbuf->len - motdbuf->pos;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
783 len = write(STDOUT_FILENO,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
784 buf_getptr(motdbuf, len), len);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
785 buf_incrpos(motdbuf, len);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
786 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
787 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
788 buf_free(motdbuf);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
789 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
790 m_free(hushpath);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
791 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
792 #endif /* DO_MOTD */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
793
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
794 execchild(chansess);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
795 /* not reached */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
796
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
797 } else {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
798 /* parent */
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
799 TRACE(("continue ptycommand: parent"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
800 chansess->pid = pid;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
801
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
802 /* add a child pid */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
803 addchildpid(chansess, pid);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
804
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
805 close(chansess->slave);
253
84925eceeb13 * rename infd/outfd to writefd/readfd, to avoid confusion
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
806 channel->writefd = chansess->master;
84925eceeb13 * rename infd/outfd to writefd/readfd, to avoid confusion
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
807 channel->readfd = chansess->master;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
808 /* don't need to set stderr here */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
809 ses.maxfd = MAX(ses.maxfd, chansess->master);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
810
109
2e9d1f29c50f merge of 50be59810e462f9f44f55e421227d6aa0b31982b
Matt Johnston <matt@ucc.asn.au>
parents: 108
diff changeset
811 setnonblocking(chansess->master);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
812
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
813 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
814
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 133
diff changeset
815 TRACE(("leave ptycommand"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
816 return DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
817 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
818
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
819 /* Add the pid of a child to the list for exit-handling */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
820 static void addchildpid(struct ChanSess *chansess, pid_t pid) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
821
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
822 unsigned int i;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
823 for (i = 0; i < svr_ses.childpidsize; i++) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
824 if (svr_ses.childpids[i].pid == -1) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
825 break;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
826 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
827 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
828
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
829 /* need to increase size */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
830 if (i == svr_ses.childpidsize) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
831 svr_ses.childpids = (struct ChildPid*)m_realloc(svr_ses.childpids,
264
541b14504870 * fix incorrect array sizing
Matt Johnston <matt@ucc.asn.au>
parents: 253
diff changeset
832 sizeof(struct ChildPid) * (svr_ses.childpidsize+1));
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
833 svr_ses.childpidsize++;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
834 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
835
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
836 svr_ses.childpids[i].pid = pid;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
837 svr_ses.childpids[i].chansess = chansess;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
838
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
839 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
840
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
841 /* Clean up, drop to user privileges, set up the environment and execute
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
842 * the command/shell. This function does not return. */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
843 static void execchild(struct ChanSess *chansess) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
844
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
845 char *argv[4];
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
846 char * usershell = NULL;
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
847 char * baseshell = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
848 unsigned int i;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
849
273
02a80ce2ead4 Merge of the uClinux-dist patch, should work in inetd mode
Matt Johnston <matt@ucc.asn.au>
parents: 264
diff changeset
850 /* with uClinux we'll have vfork()ed, so don't want to overwrite the
02a80ce2ead4 Merge of the uClinux-dist patch, should work in inetd mode
Matt Johnston <matt@ucc.asn.au>
parents: 264
diff changeset
851 * hostkey. can't think of a workaround to clear it */
02a80ce2ead4 Merge of the uClinux-dist patch, should work in inetd mode
Matt Johnston <matt@ucc.asn.au>
parents: 264
diff changeset
852 #ifndef __uClinux__
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
853 /* wipe the hostkey */
24
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 11
diff changeset
854 sign_key_free(svr_opts.hostkey);
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 11
diff changeset
855 svr_opts.hostkey = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
856
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
857 /* overwrite the prng state */
272
3be7ae2e8dfa Only read /dev/random once when the program starts
Matt Johnston <matt@ucc.asn.au>
parents: 264
diff changeset
858 reseedrandom();
273
02a80ce2ead4 Merge of the uClinux-dist patch, should work in inetd mode
Matt Johnston <matt@ucc.asn.au>
parents: 264
diff changeset
859 #endif
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
860
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
861 /* close file descriptors except stdin/stdout/stderr
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
862 * Need to be sure FDs are closed here to avoid reading files as root */
208
1a52846ec11f * fix off-by-one closing open FDs
Matt Johnston <matt@ucc.asn.au>
parents: 204
diff changeset
863 for (i = 3; i <= (unsigned int)ses.maxfd; i++) {
277
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 264
diff changeset
864 m_close(i);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
865 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
866
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
867 /* clear environment */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
868 /* if we're debugging using valgrind etc, we need to keep the LD_PRELOAD
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
869 * etc. This is hazardous, so should only be used for debugging. */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
870 #ifndef DEBUG_VALGRIND
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
871 #ifdef HAVE_CLEARENV
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
872 clearenv();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
873 #else /* don't HAVE_CLEARENV */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
874 /* Yay for posix. */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
875 if (environ) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
876 environ[0] = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
877 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
878 #endif /* HAVE_CLEARENV */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
879 #endif /* DEBUG_VALGRIND */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
880
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
881 /* We can only change uid/gid as root ... */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
882 if (getuid() == 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
883
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
884 if ((setgid(ses.authstate.pw->pw_gid) < 0) ||
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
885 (initgroups(ses.authstate.pw->pw_name,
204
675f7bf3c391 Seperate out exit errors from setgid()/initgroups(), and errors from setuid(),
Matt Johnston <matt@ucc.asn.au>
parents: 179
diff changeset
886 ses.authstate.pw->pw_gid) < 0)) {
675f7bf3c391 Seperate out exit errors from setgid()/initgroups(), and errors from setuid(),
Matt Johnston <matt@ucc.asn.au>
parents: 179
diff changeset
887 dropbear_exit("error changing user group");
675f7bf3c391 Seperate out exit errors from setgid()/initgroups(), and errors from setuid(),
Matt Johnston <matt@ucc.asn.au>
parents: 179
diff changeset
888 }
675f7bf3c391 Seperate out exit errors from setgid()/initgroups(), and errors from setuid(),
Matt Johnston <matt@ucc.asn.au>
parents: 179
diff changeset
889 if (setuid(ses.authstate.pw->pw_uid) < 0) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
890 dropbear_exit("error changing user");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
891 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
892 } else {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
893 /* ... but if the daemon is the same uid as the requested uid, we don't
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
894 * need to */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
895
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
896 /* XXX - there is a minor issue here, in that if there are multiple
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
897 * usernames with the same uid, but differing groups, then the
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
898 * differing groups won't be set (as with initgroups()). The solution
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
899 * is for the sysadmin not to give out the UID twice */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
900 if (getuid() != ses.authstate.pw->pw_uid) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
901 dropbear_exit("couldn't change user as non-root");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
902 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
903 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
904
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
905 /* an empty shell should be interpreted as "/bin/sh" */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
906 if (ses.authstate.pw->pw_shell[0] == '\0') {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
907 usershell = "/bin/sh";
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
908 } else {
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
909 usershell = ses.authstate.pw->pw_shell;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
910 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
911
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
912 /* set env vars */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
913 addnewvar("USER", ses.authstate.pw->pw_name);
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
914 addnewvar("LOGNAME", ses.authstate.pw->pw_name);
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
915 addnewvar("HOME", ses.authstate.pw->pw_dir);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
916 addnewvar("SHELL", usershell);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
917 if (chansess->term != NULL) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
918 addnewvar("TERM", chansess->term);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
919 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
920
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
921 /* change directory */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
922 if (chdir(ses.authstate.pw->pw_dir) < 0) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
923 dropbear_exit("error changing directory");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
924 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
925
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
926 #ifndef DISABLE_X11FWD
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
927 /* set up X11 forwarding if enabled */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
928 x11setauth(chansess);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
929 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
930 #ifndef DISABLE_AGENTFWD
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
931 /* set up agent env variable */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
932 agentset(chansess);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
933 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
934
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
935 /* Re-enable SIGPIPE for the executed process */
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
936 if (signal(SIGPIPE, SIG_DFL) == SIG_ERR) {
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
937 dropbear_exit("signal() error");
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
938 }
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
939
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
940 baseshell = basename(usershell);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
941
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
942 if (chansess->cmd != NULL) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
943 argv[0] = baseshell;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
944 } else {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
945 /* a login shell should be "-bash" for "/bin/bash" etc */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
946 int len = strlen(baseshell) + 2; /* 2 for "-" */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
947 argv[0] = (char*)m_malloc(len);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
948 snprintf(argv[0], len, "-%s", baseshell);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
949 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
950
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
951 if (chansess->cmd != NULL) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
952 argv[1] = "-c";
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
953 argv[2] = chansess->cmd;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
954 argv[3] = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
955 } else {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
956 /* construct a shell of the form "-bash" etc */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
957 argv[1] = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
958 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
959
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
960 execv(usershell, argv);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
961
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
962 /* only reached on error */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
963 dropbear_exit("child failed");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
964 }
9
7f77962de998 - Reworked non-channel fd handling to listener.c
Matt Johnston <matt@ucc.asn.au>
parents: 7
diff changeset
965
7
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
966 const struct ChanType svrchansess = {
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
967 0, /* sepfds */
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
968 "session", /* name */
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
969 newchansess, /* inithandler */
359
78518751cb82 just shuffle some variables names about, a brief comment
Matt Johnston <matt@ucc.asn.au>
parents: 350
diff changeset
970 sess_check_close, /* checkclosehandler */
7
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
971 chansessionrequest, /* reqhandler */
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
972 closechansess, /* closehandler */
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
973 };
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
974
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
975
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
976 /* Set up the general chansession environment, in particular child-exit
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
977 * handling */
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
978 void svr_chansessinitialise() {
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
979
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
980 struct sigaction sa_chld;
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
981
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
982 /* single child process intially */
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
983 svr_ses.childpids = (struct ChildPid*)m_malloc(sizeof(struct ChildPid));
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
984 svr_ses.childpids[0].pid = -1; /* unused */
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
985 svr_ses.childpids[0].chansess = NULL;
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
986 svr_ses.childpidsize = 1;
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987 svr_ses.lastexit.exitpid = -1; /* Nothing has exited yet */
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988 sa_chld.sa_handler = sesssigchild_handler;
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989 sa_chld.sa_flags = SA_NOCLDSTOP;
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990 if (sigaction(SIGCHLD, &sa_chld, NULL) < 0) {
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991 dropbear_exit("signal() error");
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992 }
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993
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994 }
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995
4
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996 /* add a new environment variable, allocating space for the entry */
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997 void addnewvar(const char* param, const char* var) {
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998
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999 char* newvar = NULL;
4
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1000 int plen, vlen;
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1001
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1002 plen = strlen(param);
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1003 vlen = strlen(var);
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1004
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1005 newvar = m_malloc(plen + vlen + 2); /* 2 is for '=' and '\0' */
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1006 memcpy(newvar, param, plen);
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1007 newvar[plen] = '=';
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1008 memcpy(&newvar[plen+1], var, vlen);
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1009 newvar[plen+vlen+1] = '\0';
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1010 if (putenv(newvar) < 0) {
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1011 dropbear_exit("environ error");
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1012 }
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1013 }