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annotate svr-chansession.c @ 616:ae1df0cc3f18

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Define LTC_NO_FILE to avoid hmac_file() etc
author Matt Johnston <matt@ucc.asn.au>
date Thu, 07 Apr 2011 13:24:41 +0000
parents 306a907d23e7
children 818108bf7749 67fbba2c2a85
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 "x11fwd.h"
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37 #include "agentfwd.h"
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38 #include "runopts.h"
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39 #include "auth.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(void *user_data_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 void get_termmodes(struct ChanSess *chansess);
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64
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65 /* required to clear environment */
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66 extern char** environ;
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67
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68 static int sesscheckclose(struct Channel *channel) {
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69 struct ChanSess *chansess = (struct ChanSess*)channel->typedata;
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70 TRACE(("sesscheckclose, pid is %d", chansess->exit.exitpid))
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71 return chansess->exit.exitpid != -1;
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72 }
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73
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74 /* Handler for childs exiting, store the state for return to the client */
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75
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76 /* There's a particular race we have to watch out for: if the forked child
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77 * executes, exits, and this signal-handler is called, all before the parent
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78 * gets to run, then the childpids[] array won't have the pid in it. Hence we
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79 * use the svr_ses.lastexit struct to hold the exit, which is then compared by
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80 * the parent when it runs. This work correctly at least in the case of a
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81 * single shell spawned (ie the usual case) */
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82 static void sesssigchild_handler(int UNUSED(dummy)) {
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83
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84 int status;
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85 pid_t pid;
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86 unsigned int i;
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87 struct sigaction sa_chld;
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88 struct exitinfo *exit = NULL;
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89
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90 TRACE(("enter sigchld handler"))
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91 while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
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92 TRACE(("sigchld handler: pid %d", pid))
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93
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94 exit = NULL;
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95 /* find the corresponding chansess */
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96 for (i = 0; i < svr_ses.childpidsize; i++) {
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97 if (svr_ses.childpids[i].pid == pid) {
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98 TRACE(("found match session"));
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99 exit = &svr_ses.childpids[i].chansess->exit;
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100 break;
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101 }
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102 }
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103
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104 /* If the pid wasn't matched, then we might have hit the race mentioned
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105 * above. So we just store the info for the parent to deal with */
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106 if (exit == NULL) {
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107 TRACE(("using lastexit"));
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108 exit = &svr_ses.lastexit;
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109 }
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110
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111 exit->exitpid = pid;
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112 if (WIFEXITED(status)) {
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113 exit->exitstatus = WEXITSTATUS(status);
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114 }
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115 if (WIFSIGNALED(status)) {
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116 exit->exitsignal = WTERMSIG(status);
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117 #if !defined(AIX) && defined(WCOREDUMP)
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118 exit->exitcore = WCOREDUMP(status);
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119 #else
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120 exit->exitcore = 0;
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121 #endif
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122 } else {
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123 /* we use this to determine how pid exited */
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124 exit->exitsignal = -1;
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125 }
416
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126
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127 /* Make sure that the main select() loop wakes up */
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128 while (1) {
427
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129 /* isserver is just a random byte to write. We can't do anything
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130 about an error so should just ignore it */
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131 if (write(ses.signal_pipe[1], &ses.isserver, 1) == 1
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132 || errno != EINTR) {
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133 break;
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134 }
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135 }
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136 }
130
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137
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138 sa_chld.sa_handler = sesssigchild_handler;
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139 sa_chld.sa_flags = SA_NOCLDSTOP;
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140 sigaction(SIGCHLD, &sa_chld, NULL);
165
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141 TRACE(("leave sigchld handler"))
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142 }
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143
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144 /* send the exit status or the signal causing termination for a session */
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145 static void send_exitsignalstatus(struct Channel *channel) {
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146
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147 struct ChanSess *chansess = (struct ChanSess*)channel->typedata;
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148
130
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149 if (chansess->exit.exitpid >= 0) {
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150 if (chansess->exit.exitsignal > 0) {
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151 send_msg_chansess_exitsignal(channel, chansess);
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152 } else {
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153 send_msg_chansess_exitstatus(channel, chansess);
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154 }
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155 }
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156 }
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157
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158 /* send the exitstatus to the client */
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159 static void send_msg_chansess_exitstatus(struct Channel * channel,
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160 struct ChanSess * chansess) {
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161
241
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162 dropbear_assert(chansess->exit.exitpid != -1);
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163 dropbear_assert(chansess->exit.exitsignal == -1);
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164
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165 CHECKCLEARTOWRITE();
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166
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167 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_REQUEST);
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168 buf_putint(ses.writepayload, channel->remotechan);
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169 buf_putstring(ses.writepayload, "exit-status", 11);
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170 buf_putbyte(ses.writepayload, 0); /* boolean FALSE */
130
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171 buf_putint(ses.writepayload, chansess->exit.exitstatus);
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172
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173 encrypt_packet();
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174
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175 }
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176
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177 /* send the signal causing the exit to the client */
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178 static void send_msg_chansess_exitsignal(struct Channel * channel,
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179 struct ChanSess * chansess) {
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180
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181 int i;
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182 char* signame = NULL;
241
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183 dropbear_assert(chansess->exit.exitpid != -1);
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184 dropbear_assert(chansess->exit.exitsignal > 0);
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185
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186 TRACE(("send_msg_chansess_exitsignal %d", chansess->exit.exitsignal))
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187
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188 CHECKCLEARTOWRITE();
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189
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190 /* we check that we can match a signal name, otherwise
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191 * don't send anything */
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192 for (i = 0; signames[i].name != NULL; i++) {
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193 if (signames[i].signal == chansess->exit.exitsignal) {
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194 signame = signames[i].name;
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195 break;
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196 }
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197 }
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198
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199 if (signame == NULL) {
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200 return;
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201 }
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202
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203 buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_REQUEST);
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204 buf_putint(ses.writepayload, channel->remotechan);
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205 buf_putstring(ses.writepayload, "exit-signal", 11);
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206 buf_putbyte(ses.writepayload, 0); /* boolean FALSE */
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207 buf_putstring(ses.writepayload, signame, strlen(signame));
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208 buf_putbyte(ses.writepayload, chansess->exit.exitcore);
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209 buf_putstring(ses.writepayload, "", 0); /* error msg */
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210 buf_putstring(ses.writepayload, "", 0); /* lang */
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211
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212 encrypt_packet();
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213 }
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214
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215 /* set up a session channel */
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216 static int newchansess(struct Channel *channel) {
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217
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218 struct ChanSess *chansess;
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219
241
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220 dropbear_assert(channel->typedata == NULL);
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221
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222 chansess = (struct ChanSess*)m_malloc(sizeof(struct ChanSess));
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223 chansess->cmd = NULL;
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224 chansess->connection_string = NULL;
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225 chansess->pid = 0;
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226
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227 /* pty details */
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228 chansess->master = -1;
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229 chansess->slave = -1;
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230 chansess->tty = NULL;
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231 chansess->term = NULL;
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232
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233 chansess->exit.exitpid = -1;
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234
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235 channel->typedata = chansess;
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236
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237 #ifndef DISABLE_X11FWD
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238 chansess->x11listener = NULL;
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239 chansess->x11authprot = NULL;
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240 chansess->x11authcookie = NULL;
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241 #endif
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242
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243 #ifdef ENABLE_AGENTFWD
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244 chansess->agentlistener = NULL;
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245 chansess->agentfile = NULL;
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246 chansess->agentdir = NULL;
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247 #endif
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248
6
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249 return 0;
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250
4
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251 }
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252
568
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253 static struct logininfo*
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254 chansess_login_alloc(struct ChanSess *chansess) {
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255 struct logininfo * li;
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256 li = login_alloc_entry(chansess->pid, ses.authstate.username,
572
8fd0ac8c8cab Move remotehost into svr_ses structure since we can't look it up
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diff changeset
257 svr_ses.remotehost, chansess->tty);
568
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258 return li;
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259 }
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260
4
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261 /* clean a session channel */
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262 static void closechansess(struct Channel *channel) {
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263
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264 struct ChanSess *chansess;
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265 unsigned int i;
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266 struct logininfo *li;
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267
416
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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268 TRACE(("enter closechansess"))
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269
4
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270 chansess = (struct ChanSess*)channel->typedata;
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271
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272 if (chansess == NULL) {
165
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273 TRACE(("leave closechansess: chansess == NULL"))
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274 return;
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275 }
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276
416
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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diff changeset
277 send_exitsignalstatus(channel);
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278
4
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279 m_free(chansess->cmd);
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280 m_free(chansess->term);
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281
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282 if (chansess->tty) {
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283 /* write the utmp/wtmp login record */
568
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284 li = chansess_login_alloc(chansess);
4
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285 login_logout(li);
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286 login_free_entry(li);
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287
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288 pty_release(chansess->tty);
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289 m_free(chansess->tty);
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290 }
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291
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292 #ifndef DISABLE_X11FWD
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293 x11cleanup(chansess);
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294 #endif
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295
604
810dfc792ca9 Compile fix for when both client and server agent forwarding is disabled
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296 #ifdef ENABLE_AGENTFWD
560
52d7301e46bd Agent forwarding works
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297 svr_agentcleanup(chansess);
4
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298 #endif
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299
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300 /* clear child pid entries */
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301 for (i = 0; i < svr_ses.childpidsize; i++) {
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302 if (svr_ses.childpids[i].chansess == chansess) {
241
c5d3ef11155f * use own assertions which should get logged properly
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parents: 208
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303 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
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304 TRACE(("closing pid %d", svr_ses.childpids[i].pid))
423
b2b67cfcd66e - Fix bug in child-exit handling where the wrong pid was being matched.
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parents: 416
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305 TRACE(("exitpid is %d", chansess->exit.exitpid))
4
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306 svr_ses.childpids[i].pid = -1;
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307 svr_ses.childpids[i].chansess = NULL;
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308 }
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309 }
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310
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311 m_free(chansess);
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312
165
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diff changeset
313 TRACE(("leave closechansess"))
4
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314 }
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315
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316 /* Handle requests for a channel. These can be execution requests,
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317 * or x11/authagent forwarding. These are passed to appropriate handlers */
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318 static void chansessionrequest(struct Channel *channel) {
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319
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
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320 unsigned char * type = NULL;
4
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321 unsigned int typelen;
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322 unsigned char wantreply;
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323 int ret = 1;
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324 struct ChanSess *chansess;
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325
165
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326 TRACE(("enter chansessionrequest"))
4
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327
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328 type = buf_getstring(ses.payload, &typelen);
179
161557a9dde8 * fix longstanding bug with connections being closed on failure to
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329 wantreply = buf_getbool(ses.payload);
4
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330
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331 if (typelen > MAX_NAME_LEN) {
165
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parents: 133
diff changeset
332 TRACE(("leave chansessionrequest: type too long")) /* XXX send error?*/
4
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333 goto out;
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parents:
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334 }
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335
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336 chansess = (struct ChanSess*)channel->typedata;
241
c5d3ef11155f * use own assertions which should get logged properly
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parents: 208
diff changeset
337 dropbear_assert(chansess != NULL);
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
338 TRACE(("type is %s", type))
4
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339
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340 if (strcmp(type, "window-change") == 0) {
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diff changeset
341 ret = sessionwinchange(chansess);
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342 } else if (strcmp(type, "shell") == 0) {
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343 ret = sessioncommand(channel, chansess, 0, 0);
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344 } else if (strcmp(type, "pty-req") == 0) {
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345 ret = sessionpty(chansess);
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346 } else if (strcmp(type, "exec") == 0) {
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347 ret = sessioncommand(channel, chansess, 1, 0);
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348 } else if (strcmp(type, "subsystem") == 0) {
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349 ret = sessioncommand(channel, chansess, 1, 1);
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diff changeset
350 #ifndef DISABLE_X11FWD
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351 } else if (strcmp(type, "x11-req") == 0) {
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diff changeset
352 ret = x11req(chansess);
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diff changeset
353 #endif
604
810dfc792ca9 Compile fix for when both client and server agent forwarding is disabled
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
354 #ifdef ENABLE_AGENTFWD
4
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diff changeset
355 } else if (strcmp(type, "[email protected]") == 0) {
560
52d7301e46bd Agent forwarding works
Matt Johnston <matt@ucc.asn.au>
parents: 508
diff changeset
356 ret = svr_agentreq(chansess);
4
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diff changeset
357 #endif
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358 } else if (strcmp(type, "signal") == 0) {
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diff changeset
359 ret = sessionsignal(chansess);
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parents:
diff changeset
360 } else {
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parents:
diff changeset
361 /* etc, todo "env", "subsystem" */
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parents:
diff changeset
362 }
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parents:
diff changeset
363
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parents:
diff changeset
364 out:
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365
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diff changeset
366 if (wantreply) {
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
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parents: 62
diff changeset
367 if (ret == DROPBEAR_SUCCESS) {
4
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diff changeset
368 send_msg_channel_success(channel);
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parents:
diff changeset
369 } else {
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diff changeset
370 send_msg_channel_failure(channel);
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371 }
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372 }
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373
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374 m_free(type);
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
375 TRACE(("leave chansessionrequest"))
4
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diff changeset
376 }
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parents:
diff changeset
377
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378
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379 /* Send a signal to a session's process as requested by the client*/
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diff changeset
380 static int sessionsignal(struct ChanSess *chansess) {
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diff changeset
381
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parents:
diff changeset
382 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
383 unsigned char* signame = NULL;
4
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parents:
diff changeset
384 int i;
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parents:
diff changeset
385
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parents:
diff changeset
386 if (chansess->pid == 0) {
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parents:
diff changeset
387 /* haven't got a process pid yet */
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diff changeset
388 return DROPBEAR_FAILURE;
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parents:
diff changeset
389 }
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parents:
diff changeset
390
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parents:
diff changeset
391 signame = buf_getstring(ses.payload, NULL);
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parents:
diff changeset
392
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parents:
diff changeset
393 i = 0;
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parents:
diff changeset
394 while (signames[i].name != 0) {
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parents:
diff changeset
395 if (strcmp(signames[i].name, signame) == 0) {
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parents:
diff changeset
396 sig = signames[i].signal;
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parents:
diff changeset
397 break;
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parents:
diff changeset
398 }
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parents:
diff changeset
399 i++;
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parents:
diff changeset
400 }
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parents:
diff changeset
401
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parents:
diff changeset
402 m_free(signame);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
403
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
404 if (sig == 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
405 /* failed */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
406 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
407 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
408
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
409 if (kill(chansess->pid, sig) < 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
410 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
411 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
412
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
413 return DROPBEAR_SUCCESS;
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
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
416 /* 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
417 * client. Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
418 static int sessionwinchange(struct ChanSess *chansess) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
419
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
420 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
421
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
422 if (chansess->master < 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
423 /* haven't got a pty yet */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
424 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
425 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
426
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
427 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
428 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
429 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
430 termh = buf_getint(ses.payload);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
431
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
432 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
433
315
3eea61bd9993 send success message for successful window change request
Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
434 return DROPBEAR_SUCCESS;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
435 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
436
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
437 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
438
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
439 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
440 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
441 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
442 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
443 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
444
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
445 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
446
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
447 /* Term modes */
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
448 /* 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
449 * 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
450 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
451 return;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
452 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
453
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
454 len = buf_getint(ses.payload);
62
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
455 TRACE(("term mode str %d p->l %d p->p %d",
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
456 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
457 if (len != ses.payload->len - ses.payload->pos) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 581
diff changeset
458 dropbear_exit("Bad term mode string");
40
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
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
461 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
462 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
463 return;
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
464 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
465
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
466 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
467
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
468 /* 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
469 * 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
470 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
471
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
472 /* 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
473 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
474 continue;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
475 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
476 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
477
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
478
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
479 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
480
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
481 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
482 break;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
483
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
484 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
485 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
486 break;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
487
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
488 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
489 if (value) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
490 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
491 } else {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
492 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
493 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
494 break;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
495
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
496 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
497 if (value) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
498 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
499 } else {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
500 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
501 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
502 break;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
503
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
504 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
505 if (value) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
506 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
507 } else {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
508 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
509 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
510 break;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
511
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
512 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
513 if (value) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
514 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
515 } else {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
516 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
517 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
518 break;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
519
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
520 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
521 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
522 if (tcsetattr(chansess->master, TCSANOW, &termio) < 0) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 581
diff changeset
523 dropbear_log(LOG_INFO, "Error setting terminal attributes");
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
524 }
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
525 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
526 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
527
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
528 /* 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
529 * 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
530 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
531 static int sessionpty(struct ChanSess * chansess) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
532
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
533 unsigned int termlen;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
534 unsigned char namebuf[65];
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 427
diff changeset
535 struct passwd * pw = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
536
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
537 TRACE(("enter sessionpty"))
475
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
Matt Johnston <matt@ucc.asn.au>
parents: 466
diff changeset
538
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
Matt Johnston <matt@ucc.asn.au>
parents: 466
diff changeset
539 if (!svr_pubkey_allows_pty()) {
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
Matt Johnston <matt@ucc.asn.au>
parents: 466
diff changeset
540 TRACE(("leave sessionpty : pty forbidden by public key option"))
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
Matt Johnston <matt@ucc.asn.au>
parents: 466
diff changeset
541 return DROPBEAR_FAILURE;
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
Matt Johnston <matt@ucc.asn.au>
parents: 466
diff changeset
542 }
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
Matt Johnston <matt@ucc.asn.au>
parents: 466
diff changeset
543
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
544 chansess->term = buf_getstring(ses.payload, &termlen);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
545 if (termlen > MAX_TERM_LEN) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
546 /* 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
547 TRACE(("leave sessionpty: term len too long"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
548 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
549 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
550
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
551 /* allocate the pty */
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents: 96
diff changeset
552 if (chansess->master != -1) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 581
diff changeset
553 dropbear_exit("Multiple pty requests");
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents: 96
diff changeset
554 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
555 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
556 TRACE(("leave sessionpty: failed to allocate pty"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
557 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
558 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
559
11
f76c9389e9e0 Mostly done with the listener changeover
Matt Johnston <matt@ucc.asn.au>
parents: 9
diff changeset
560 chansess->tty = (char*)m_strdup(namebuf);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
561 if (!chansess->tty) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 581
diff changeset
562 dropbear_exit("Out of memory"); /* TODO disconnect */
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
563 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
564
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 427
diff changeset
565 pw = getpwnam(ses.authstate.pw_name);
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 427
diff changeset
566 if (!pw)
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 427
diff changeset
567 dropbear_exit("getpwnam failed after succeeding previously");
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 427
diff changeset
568 pty_setowner(pw, chansess->tty);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
569
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
570 /* 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
571 sessionwinchange(chansess);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
572
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
573 /* 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
574 get_termmodes(chansess);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
575
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
576 TRACE(("leave sessionpty"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
577 return DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
578 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
579
569
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
580 static char* make_connection_string() {
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
581 char *local_ip, *local_port, *remote_ip, *remote_port;
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
582 size_t len;
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
583 char *ret;
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
584 get_socket_address(ses.sock_in, &local_ip, &local_port, &remote_ip, &remote_port, 0);
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
585 len = strlen(local_ip) + strlen(local_port) + strlen(remote_ip) + strlen(remote_port) + 4;
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
586 ret = m_malloc(len);
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
587 snprintf(ret, len, "%s %s %s %s", remote_ip, remote_port, local_ip, local_port);
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
588 m_free(local_ip);
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
589 m_free(local_port);
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
590 m_free(remote_ip);
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
591 m_free(remote_port);
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
592 return ret;
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
593 }
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
594
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
595 /* 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
596 * 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
597 * noptycommand or ptycommand as appropriate.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
598 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
599 static int sessioncommand(struct Channel *channel, struct ChanSess *chansess,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
600 int iscmd, int issubsys) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
601
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
602 unsigned int cmdlen;
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
603 int ret;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
604
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
605 TRACE(("enter sessioncommand"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
606
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
607 if (chansess->cmd != NULL) {
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 /* Note that only one command can _succeed_. The client might try
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
609 * one command (which fails), then try another. Ie fallback
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
610 * from sftp to scp */
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
611 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
612 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
613
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
614 if (iscmd) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
615 /* "exec" */
475
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
Matt Johnston <matt@ucc.asn.au>
parents: 466
diff changeset
616 if (chansess->cmd == NULL) {
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
Matt Johnston <matt@ucc.asn.au>
parents: 466
diff changeset
617 chansess->cmd = buf_getstring(ses.payload, &cmdlen);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
618
475
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
Matt Johnston <matt@ucc.asn.au>
parents: 466
diff changeset
619 if (cmdlen > MAX_CMD_LEN) {
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
Matt Johnston <matt@ucc.asn.au>
parents: 466
diff changeset
620 m_free(chansess->cmd);
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
Matt Johnston <matt@ucc.asn.au>
parents: 466
diff changeset
621 /* TODO - send error - too long ? */
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
Matt Johnston <matt@ucc.asn.au>
parents: 466
diff changeset
622 return DROPBEAR_FAILURE;
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
Matt Johnston <matt@ucc.asn.au>
parents: 466
diff changeset
623 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
624 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
625 if (issubsys) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
626 #ifdef SFTPSERVER_PATH
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
627 if ((cmdlen == 4) && strncmp(chansess->cmd, "sftp", 4) == 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
628 m_free(chansess->cmd);
11
f76c9389e9e0 Mostly done with the listener changeover
Matt Johnston <matt@ucc.asn.au>
parents: 9
diff changeset
629 chansess->cmd = m_strdup(SFTPSERVER_PATH);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
630 } else
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
631 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
632 {
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
633 m_free(chansess->cmd);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
634 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
635 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
636 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
637 }
566
b321aeb57c64 - set $SSH_ORIGINAL_COMMAND if a command is forced, and log it
Matt Johnston <matt@ucc.asn.au>
parents: 560
diff changeset
638
b321aeb57c64 - set $SSH_ORIGINAL_COMMAND if a command is forced, and log it
Matt Johnston <matt@ucc.asn.au>
parents: 560
diff changeset
639 /* take public key option 'command' into account */
b321aeb57c64 - set $SSH_ORIGINAL_COMMAND if a command is forced, and log it
Matt Johnston <matt@ucc.asn.au>
parents: 560
diff changeset
640 svr_pubkey_set_forced_command(chansess);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
641
349
dba106bf6b34 Add (disabled by default) LOG_COMMANDS option to log the commands executed
Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
642 #ifdef LOG_COMMANDS
dba106bf6b34 Add (disabled by default) LOG_COMMANDS option to log the commands executed
Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
643 if (chansess->cmd) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 581
diff changeset
644 dropbear_log(LOG_INFO, "User %s executing '%s'",
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 427
diff changeset
645 ses.authstate.pw_name, chansess->cmd);
349
dba106bf6b34 Add (disabled by default) LOG_COMMANDS option to log the commands executed
Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
646 } else {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 581
diff changeset
647 dropbear_log(LOG_INFO, "User %s executing login shell",
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 427
diff changeset
648 ses.authstate.pw_name);
349
dba106bf6b34 Add (disabled by default) LOG_COMMANDS option to log the commands executed
Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
649 }
dba106bf6b34 Add (disabled by default) LOG_COMMANDS option to log the commands executed
Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
650 #endif
dba106bf6b34 Add (disabled by default) LOG_COMMANDS option to log the commands executed
Matt Johnston <matt@ucc.asn.au>
parents: 279
diff changeset
651
569
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
652 /* uClinux will vfork(), so there'll be a race as
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
653 connection_string is freed below. */
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
654 #ifndef __uClinux__
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
655 chansess->connection_string = make_connection_string();
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
656 #endif
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 567
diff changeset
657
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
658 if (chansess->term == NULL) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
659 /* no 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
660 ret = noptycommand(channel, chansess);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
661 } else {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
662 /* 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
663 ret = ptycommand(channel, chansess);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
664 }
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
665
569
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
666 #ifndef __uClinux__
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
667 m_free(chansess->connection_string);
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
668 #endif
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
669
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
670 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
671 m_free(chansess->cmd);
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
672 }
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
673 return ret;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
674 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
675
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
676 /* Execute a command and set up redirection of stdin/stdout/stderr without a
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
677 * pty.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
678 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
679 static int noptycommand(struct Channel *channel, struct ChanSess *chansess) {
481
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
680 int ret;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
681
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
682 TRACE(("enter noptycommand"))
481
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
683 ret = spawn_command(execchild, chansess,
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
684 &channel->writefd, &channel->readfd, &channel->errfd,
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
685 &chansess->pid);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
686
481
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
687 if (ret == DROPBEAR_FAILURE) {
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
688 return ret;
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
689 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
690
481
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
691 ses.maxfd = MAX(ses.maxfd, channel->writefd);
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
692 ses.maxfd = MAX(ses.maxfd, channel->readfd);
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
693 ses.maxfd = MAX(ses.maxfd, channel->errfd);
427
5df05d0a5366 Revert to default sigchld handler after forking, don't exit
Matt Johnston <matt@ucc.asn.au>
parents: 423
diff changeset
694
609
306a907d23e7 Avoid segfault when handling childpid race
Matt Johnston <matt@ucc.asn.au>
parents: 604
diff changeset
695 sleep(1);
306a907d23e7 Avoid segfault when handling childpid race
Matt Johnston <matt@ucc.asn.au>
parents: 604
diff changeset
696
481
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
697 addchildpid(chansess, chansess->pid);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
698
481
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
699 if (svr_ses.lastexit.exitpid != -1) {
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 496
diff changeset
700 unsigned int i;
481
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
701 TRACE(("parent side: lastexitpid is %d", svr_ses.lastexit.exitpid))
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
702 /* The child probably exited and the signal handler triggered
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
703 * possibly before we got around to adding the childpid. So we fill
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
704 * out its data manually */
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
705 for (i = 0; i < svr_ses.childpidsize; i++) {
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
706 if (svr_ses.childpids[i].pid == svr_ses.lastexit.exitpid) {
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
707 TRACE(("found match for lastexitpid"))
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
708 svr_ses.childpids[i].chansess->exit = svr_ses.lastexit;
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
709 svr_ses.lastexit.exitpid = -1;
609
306a907d23e7 Avoid segfault when handling childpid race
Matt Johnston <matt@ucc.asn.au>
parents: 604
diff changeset
710 break;
130
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
711 }
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
712 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
713 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
714
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
715 TRACE(("leave noptycommand"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
716 return DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
717 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
718
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
719 /* 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
720 * redirection as appropriate.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
721 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
722 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
723
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
724 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
725 struct logininfo *li = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
726 #ifdef DO_MOTD
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
727 buffer * motdbuf = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
728 int len;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
729 struct stat sb;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
730 char *hushpath = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
731 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
732
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
733 TRACE(("enter ptycommand"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
734
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
735 /* we need to have a pty allocated */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
736 if (chansess->master == -1 || chansess->tty == NULL) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 581
diff changeset
737 dropbear_log(LOG_WARNING, "No pty was allocated, couldn't execute");
4
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
273
02a80ce2ead4 Merge of the uClinux-dist patch, should work in inetd mode
Matt Johnston <matt@ucc.asn.au>
parents: 264
diff changeset
741 #ifdef __uClinux__
02a80ce2ead4 Merge of the uClinux-dist patch, should work in inetd mode
Matt Johnston <matt@ucc.asn.au>
parents: 264
diff changeset
742 pid = vfork();
02a80ce2ead4 Merge of the uClinux-dist patch, should work in inetd mode
Matt Johnston <matt@ucc.asn.au>
parents: 264
diff changeset
743 #else
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
744 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
745 #endif
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
746 if (pid < 0)
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
747 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
748
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
749 if (pid == 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
750 /* child */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
751
427
5df05d0a5366 Revert to default sigchld handler after forking, don't exit
Matt Johnston <matt@ucc.asn.au>
parents: 423
diff changeset
752 TRACE(("back to normal sigchld"))
5df05d0a5366 Revert to default sigchld handler after forking, don't exit
Matt Johnston <matt@ucc.asn.au>
parents: 423
diff changeset
753 /* Revert to normal sigchld handling */
5df05d0a5366 Revert to default sigchld handler after forking, don't exit
Matt Johnston <matt@ucc.asn.au>
parents: 423
diff changeset
754 if (signal(SIGCHLD, SIG_DFL) == SIG_ERR) {
5df05d0a5366 Revert to default sigchld handler after forking, don't exit
Matt Johnston <matt@ucc.asn.au>
parents: 423
diff changeset
755 dropbear_exit("signal() error");
5df05d0a5366 Revert to default sigchld handler after forking, don't exit
Matt Johnston <matt@ucc.asn.au>
parents: 423
diff changeset
756 }
5df05d0a5366 Revert to default sigchld handler after forking, don't exit
Matt Johnston <matt@ucc.asn.au>
parents: 423
diff changeset
757
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
758 /* redirect stdin/stdout/stderr */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
759 close(chansess->master);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
760
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
761 pty_make_controlling_tty(&chansess->slave, chansess->tty);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
762
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
763 if ((dup2(chansess->slave, STDIN_FILENO) < 0) ||
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
764 (dup2(chansess->slave, STDERR_FILENO) < 0) ||
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
765 (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
766 TRACE(("leave ptycommand: error redirecting filedesc"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
767 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
768 }
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 close(chansess->slave);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
771
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
772 /* 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
773 * terminal used for stdout with the dup2 above */
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 567
diff changeset
774 li = chansess_login_alloc(chansess);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
775 login_login(li);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
776 login_free_entry(li);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
777
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
778 #ifdef DO_MOTD
24
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 11
diff changeset
779 if (svr_opts.domotd) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
780 /* don't show the motd if ~/.hushlogin exists */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
781
462
1009980436c2 Actually use ~/.hushlogin rather than ~/hushlogin to ignore motd.
Matt Johnston <matt@ucc.asn.au>
parents: 427
diff changeset
782 /* 12 == strlen("/.hushlogin\0") */
466
f11544d96354 fix up after merge
Matt Johnston <matt@ucc.asn.au>
parents: 465
diff changeset
783 len = strlen(ses.authstate.pw_dir) + 12;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
784
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
785 hushpath = m_malloc(len);
466
f11544d96354 fix up after merge
Matt Johnston <matt@ucc.asn.au>
parents: 465
diff changeset
786 snprintf(hushpath, len, "%s/.hushlogin", ses.authstate.pw_dir);
4
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 if (stat(hushpath, &sb) < 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
789 /* more than a screenful is stupid IMHO */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
790 motdbuf = buf_new(80 * 25);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
791 if (buf_readfile(motdbuf, MOTD_FILENAME) == DROPBEAR_SUCCESS) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
792 buf_setpos(motdbuf, 0);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
793 while (motdbuf->pos != motdbuf->len) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
794 len = motdbuf->len - motdbuf->pos;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
795 len = write(STDOUT_FILENO,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
796 buf_getptr(motdbuf, len), len);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
797 buf_incrpos(motdbuf, len);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
798 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
799 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
800 buf_free(motdbuf);
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 m_free(hushpath);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
803 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
804 #endif /* DO_MOTD */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
805
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
806 execchild(chansess);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
807 /* not reached */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
808
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
809 } else {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
810 /* 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
811 TRACE(("continue ptycommand: parent"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
812 chansess->pid = pid;
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 /* add a child pid */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
815 addchildpid(chansess, pid);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
816
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
817 close(chansess->slave);
253
84925eceeb13 * rename infd/outfd to writefd/readfd, to avoid confusion
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
818 channel->writefd = chansess->master;
84925eceeb13 * rename infd/outfd to writefd/readfd, to avoid confusion
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
819 channel->readfd = chansess->master;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
820 /* don't need to set stderr here */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
821 ses.maxfd = MAX(ses.maxfd, chansess->master);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
822
109
2e9d1f29c50f merge of 50be59810e462f9f44f55e421227d6aa0b31982b
Matt Johnston <matt@ucc.asn.au>
parents: 108
diff changeset
823 setnonblocking(chansess->master);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
824
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
825 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
826
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
827 TRACE(("leave ptycommand"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
828 return DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
829 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
830
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
831 /* 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
832 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
833
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
834 unsigned int i;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
835 for (i = 0; i < svr_ses.childpidsize; i++) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
836 if (svr_ses.childpids[i].pid == -1) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
837 break;
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 /* need to increase size */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
842 if (i == svr_ses.childpidsize) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
843 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
844 sizeof(struct ChildPid) * (svr_ses.childpidsize+1));
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
845 svr_ses.childpidsize++;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
846 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
847
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
848 svr_ses.childpids[i].pid = pid;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
849 svr_ses.childpids[i].chansess = chansess;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
850
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
851 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
852
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
853 /* 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
854 * the command/shell. This function does not return. */
481
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
855 static void execchild(void *user_data) {
357a2e2e9bcc - Generalise spawn_command function
Matt Johnston <matt@ucc.asn.au>
parents: 480
diff changeset
856 struct ChanSess *chansess = user_data;
482
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 481
diff changeset
857 char *usershell = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
858
273
02a80ce2ead4 Merge of the uClinux-dist patch, should work in inetd mode
Matt Johnston <matt@ucc.asn.au>
parents: 264
diff changeset
859 /* 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
860 * 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
861 #ifndef __uClinux__
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
862 /* wipe the hostkey */
24
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 11
diff changeset
863 sign_key_free(svr_opts.hostkey);
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 11
diff changeset
864 svr_opts.hostkey = NULL;
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 /* 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
867 reseedrandom();
273
02a80ce2ead4 Merge of the uClinux-dist patch, should work in inetd mode
Matt Johnston <matt@ucc.asn.au>
parents: 264
diff changeset
868 #endif
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
869
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
870 /* clear environment */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
871 /* 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
872 * 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
873 #ifndef DEBUG_VALGRIND
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
874 #ifdef HAVE_CLEARENV
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
875 clearenv();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
876 #else /* don't HAVE_CLEARENV */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
877 /* Yay for posix. */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
878 if (environ) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
879 environ[0] = NULL;
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 #endif /* HAVE_CLEARENV */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
882 #endif /* DEBUG_VALGRIND */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
883
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
884 /* We can only change uid/gid as root ... */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
885 if (getuid() == 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
886
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 427
diff changeset
887 if ((setgid(ses.authstate.pw_gid) < 0) ||
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 427
diff changeset
888 (initgroups(ses.authstate.pw_name,
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 427
diff changeset
889 ses.authstate.pw_gid) < 0)) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 581
diff changeset
890 dropbear_exit("Error changing user group");
204
675f7bf3c391 Seperate out exit errors from setgid()/initgroups(), and errors from setuid(),
Matt Johnston <matt@ucc.asn.au>
parents: 179
diff changeset
891 }
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 427
diff changeset
892 if (setuid(ses.authstate.pw_uid) < 0) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 581
diff changeset
893 dropbear_exit("Error changing user");
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
894 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
895 } else {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
896 /* ... 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
897 * need to */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
898
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
899 /* 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
900 * 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
901 * 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
902 * is for the sysadmin not to give out the UID twice */
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 427
diff changeset
903 if (getuid() != ses.authstate.pw_uid) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 581
diff changeset
904 dropbear_exit("Couldn't change user as non-root");
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
905 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
906 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
907
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
908 /* set env vars */
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 427
diff changeset
909 addnewvar("USER", ses.authstate.pw_name);
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 427
diff changeset
910 addnewvar("LOGNAME", ses.authstate.pw_name);
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 427
diff changeset
911 addnewvar("HOME", ses.authstate.pw_dir);
482
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 481
diff changeset
912 addnewvar("SHELL", get_user_shell());
508
d4bbc0039008 - Set a default path, since bash won't export one otherwise (though it will set
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
913 addnewvar("PATH", DEFAULT_PATH);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
914 if (chansess->term != NULL) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
915 addnewvar("TERM", chansess->term);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
916 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
917
567
893a9dd0b9dd - set $SSH_TTY environment variable
Matt Johnston <matt@ucc.asn.au>
parents: 566
diff changeset
918 if (chansess->tty) {
893a9dd0b9dd - set $SSH_TTY environment variable
Matt Johnston <matt@ucc.asn.au>
parents: 566
diff changeset
919 addnewvar("SSH_TTY", chansess->tty);
893a9dd0b9dd - set $SSH_TTY environment variable
Matt Johnston <matt@ucc.asn.au>
parents: 566
diff changeset
920 }
893a9dd0b9dd - set $SSH_TTY environment variable
Matt Johnston <matt@ucc.asn.au>
parents: 566
diff changeset
921
569
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
922 if (chansess->connection_string) {
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
923 addnewvar("SSH_CONNECTION", chansess->connection_string);
6f472dc54da7 - Set $SSH_CONNECTION
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
924 }
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 567
diff changeset
925
566
b321aeb57c64 - set $SSH_ORIGINAL_COMMAND if a command is forced, and log it
Matt Johnston <matt@ucc.asn.au>
parents: 560
diff changeset
926 #ifdef ENABLE_SVR_PUBKEY_OPTIONS
b321aeb57c64 - set $SSH_ORIGINAL_COMMAND if a command is forced, and log it
Matt Johnston <matt@ucc.asn.au>
parents: 560
diff changeset
927 if (ses.authstate.pubkey_options &&
b321aeb57c64 - set $SSH_ORIGINAL_COMMAND if a command is forced, and log it
Matt Johnston <matt@ucc.asn.au>
parents: 560
diff changeset
928 ses.authstate.pubkey_options->original_command) {
b321aeb57c64 - set $SSH_ORIGINAL_COMMAND if a command is forced, and log it
Matt Johnston <matt@ucc.asn.au>
parents: 560
diff changeset
929 addnewvar("SSH_ORIGINAL_COMMAND",
b321aeb57c64 - set $SSH_ORIGINAL_COMMAND if a command is forced, and log it
Matt Johnston <matt@ucc.asn.au>
parents: 560
diff changeset
930 ses.authstate.pubkey_options->original_command);
b321aeb57c64 - set $SSH_ORIGINAL_COMMAND if a command is forced, and log it
Matt Johnston <matt@ucc.asn.au>
parents: 560
diff changeset
931 }
b321aeb57c64 - set $SSH_ORIGINAL_COMMAND if a command is forced, and log it
Matt Johnston <matt@ucc.asn.au>
parents: 560
diff changeset
932 #endif
b321aeb57c64 - set $SSH_ORIGINAL_COMMAND if a command is forced, and log it
Matt Johnston <matt@ucc.asn.au>
parents: 560
diff changeset
933
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
934 /* change directory */
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 427
diff changeset
935 if (chdir(ses.authstate.pw_dir) < 0) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 581
diff changeset
936 dropbear_exit("Error changing directory");
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
937 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
938
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
939 #ifndef DISABLE_X11FWD
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
940 /* set up X11 forwarding if enabled */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
941 x11setauth(chansess);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
942 #endif
604
810dfc792ca9 Compile fix for when both client and server agent forwarding is disabled
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
943 #ifdef ENABLE_AGENTFWD
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
944 /* set up agent env variable */
560
52d7301e46bd Agent forwarding works
Matt Johnston <matt@ucc.asn.au>
parents: 508
diff changeset
945 svr_agentset(chansess);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
946 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
947
482
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 481
diff changeset
948 usershell = m_strdup(get_user_shell());
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 481
diff changeset
949 run_shell_command(chansess->cmd, ses.maxfd, usershell);
4
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 /* only reached on error */
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 581
diff changeset
952 dropbear_exit("Child failed");
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
953 }
9
7f77962de998 - Reworked non-channel fd handling to listener.c
Matt Johnston <matt@ucc.asn.au>
parents: 7
diff changeset
954
7
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
955 const struct ChanType svrchansess = {
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
956 0, /* sepfds */
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
957 "session", /* name */
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
958 newchansess, /* inithandler */
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
959 sesscheckclose, /* checkclosehandler */
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
960 chansessionrequest, /* reqhandler */
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
961 closechansess, /* closehandler */
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
962 };
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
963
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
964
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
965 /* 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
966 * handling */
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
967 void svr_chansessinitialise() {
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
968
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
969 struct sigaction sa_chld;
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
970
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
971 /* single child process intially */
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
972 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
973 svr_ses.childpids[0].pid = -1; /* unused */
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
974 svr_ses.childpids[0].chansess = NULL;
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
975 svr_ses.childpidsize = 1;
133
b4cfe976c8e1 Initialise the "lastexit" variable so that we don't get session channels
Matt Johnston <matt@ucc.asn.au>
parents: 130
diff changeset
976 svr_ses.lastexit.exitpid = -1; /* Nothing has exited yet */
7
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
977 sa_chld.sa_handler = sesssigchild_handler;
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
978 sa_chld.sa_flags = SA_NOCLDSTOP;
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
979 if (sigaction(SIGCHLD, &sa_chld, NULL) < 0) {
425ed5c20157 Chantype handling is sorted
Matt Johnston <matt@ucc.asn.au>
parents: 6
diff changeset
980 dropbear_exit("signal() error");
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
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983 }
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984
4
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985 /* add a new environment variable, allocating space for the entry */
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986 void addnewvar(const char* param, const char* var) {
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987
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
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988 char* newvar = NULL;
4
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989 int plen, vlen;
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990
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991 plen = strlen(param);
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992 vlen = strlen(var);
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993
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994 newvar = m_malloc(plen + vlen + 2); /* 2 is for '=' and '\0' */
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995 memcpy(newvar, param, plen);
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996 newvar[plen] = '=';
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997 memcpy(&newvar[plen+1], var, vlen);
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998 newvar[plen+vlen+1] = '\0';
372
fbcc3b5b34f3 comment about putenv() leaking malloced variables
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999 /* newvar is leaked here, but that's part of putenv()'s semantics */
4
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1000 if (putenv(newvar) < 0) {
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1001 dropbear_exit("environ error");
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1002 }
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1003 }