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annotate session.h @ 575:f9b5dc0cba61

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- Disable compression for non-final multihops
author Matt Johnston <matt@ucc.asn.au>
date Fri, 11 Sep 2009 14:02:04 +0000
parents 8fd0ac8c8cab
children 00eca37e47e8
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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 #ifndef _SESSION_H_
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26 #define _SESSION_H_
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27
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28 #include "includes.h"
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29 #include "options.h"
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30 #include "buffer.h"
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31 #include "signkey.h"
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32 #include "kex.h"
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33 #include "auth.h"
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34 #include "channel.h"
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35 #include "queue.h"
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36 #include "listener.h"
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37 #include "packet.h"
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38 #include "tcpfwd.h"
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39 #include "chansession.h"
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40
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41 extern int sessinitdone; /* Is set to 0 somewhere */
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42 extern int exitflag;
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43
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44 void common_session_init(int sock_in, int sock_out);
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45 void session_loop(void(*loophandler)());
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46 void common_session_cleanup();
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47 void session_identification();
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48 void send_msg_ignore();
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49
482
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50 const char* get_user_shell();
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51 void fill_passwd(const char* username);
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52
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53 /* Server */
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54 void svr_session(int sock, int childpipe);
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55 void svr_dropbear_exit(int exitcode, const char* format, va_list param);
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56 void svr_dropbear_log(int priority, const char* format, va_list param);
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57
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58 /* Client */
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59 void cli_session(int sock_in, int sock_out);
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60 void cli_session_cleanup();
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61 void cleantext(unsigned char* dirtytext);
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62
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63 /* crypto parameters that are stored individually for transmit and receive */
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64 struct key_context_directional {
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65 const struct dropbear_cipher *algo_crypt; /* NULL for none */
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66 const struct dropbear_cipher_mode *crypt_mode;
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67 const struct dropbear_hash *algo_mac; /* NULL for none */
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68 int hash_index; /* lookup for libtomcrypt */
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69 char algo_comp; /* compression */
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70 #ifndef DISABLE_ZLIB
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71 z_streamp zstream;
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72 #endif
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73 /* actual keys */
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74 union {
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75 symmetric_CBC cbc;
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76 #ifdef DROPBEAR_ENABLE_CTR_MODE
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77 symmetric_CTR ctr;
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78 #endif
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79 } cipher_state;
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80 unsigned char mackey[MAX_MAC_KEY];
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81 };
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82
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83 struct key_context {
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84
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85 struct key_context_directional recv;
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86 struct key_context_directional trans;
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87
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88 char algo_kex;
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89 char algo_hostkey;
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90
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91 int allow_compress; /* whether compression has started (useful in
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92 [email protected] delayed compression case) */
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93 };
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94
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95 struct packetlist;
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96 struct packetlist {
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97 struct packetlist *next;
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98 buffer * payload;
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99 };
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100
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101 struct sshsession {
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102
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103 /* Is it a client or server? */
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104 unsigned char isserver;
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105
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106 time_t connect_time; /* time the connection was established
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107 (cleared after auth once we're not
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108 respecting AUTH_TIMEOUT any more) */
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109
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110 int sock_in;
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111 int sock_out;
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112
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113 unsigned char *remoteident;
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114
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115 int maxfd; /* the maximum file descriptor to check with select() */
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116
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117
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118 /* Packet buffers/values etc */
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119 buffer *writepayload; /* Unencrypted payload to write - this is used
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120 throughout the code, as handlers fill out this
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121 buffer with the packet to send. */
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122 struct Queue writequeue; /* A queue of encrypted packets to send */
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123 buffer *readbuf; /* From the wire, decrypted in-place */
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124 buffer *payload; /* Post-decompression, the actual SSH packet */
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125 unsigned int transseq, recvseq; /* Sequence IDs */
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126
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127 /* Packet-handling flags */
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128 const packettype * packettypes; /* Packet handler mappings for this
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129 session, see process-packet.c */
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130
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131 unsigned dataallowed : 1; /* whether we can send data packets or we are in
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132 the middle of a KEX or something */
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133
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134 unsigned char requirenext; /* byte indicating what packet we require next,
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135 or 0x00 for any */
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136
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137 unsigned char ignorenext; /* whether to ignore the next packet,
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138 used for kex_follows stuff */
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139
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140 unsigned char lastpacket; /* What the last received packet type was */
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141
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142 int signal_pipe[2]; /* stores endpoints of a self-pipe used for
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143 race-free signal handling */
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144
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145 time_t last_trx_packet_time; /* time of the last packet transmission, for
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146 keepalive purposes */
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147
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148 time_t last_packet_time; /* time of the last packet transmission or receive, for
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149 idle timeout purposes */
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150
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151
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152 /* KEX/encryption related */
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153 struct KEXState kexstate;
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154 struct key_context *keys;
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155 struct key_context *newkeys;
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156 unsigned char *session_id; /* this is the hash from the first kex */
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157 /* The below are used temorarily during kex, are freed after use */
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158 mp_int * dh_K; /* SSH_MSG_KEXDH_REPLY and sending SSH_MSH_NEWKEYS */
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159 unsigned char hash[SHA1_HASH_SIZE]; /* the hash*/
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160 buffer* kexhashbuf; /* session hash buffer calculated from various packets*/
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161 buffer* transkexinit; /* the kexinit packet we send should be kept so we
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162 can add it to the hash when generating keys */
575
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163
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164 /* Enables/disables compression */
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165 algo_type *compress_algos;
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166
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167 /* a list of queued replies that should be sent after a KEX has
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168 concluded (ie, while dataallowed was unset)*/
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169 struct packetlist *reply_queue_head, *reply_queue_tail;
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170
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171 algo_type*(*buf_match_algo)(buffer*buf, algo_type localalgos[],
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172 int *goodguess); /* The function to use to choose which algorithm
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173 to use from the ones presented by the remote
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174 side. Is specific to the client/server mode,
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175 hence the function-pointer callback.*/
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176
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177 void(*remoteclosed)(); /* A callback to handle closure of the
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178 remote connection */
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179
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180
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181 struct AuthState authstate; /* Common amongst client and server, since most
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182 struct elements are common */
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183
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184 /* Channel related */
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185 struct Channel ** channels; /* these pointers may be null */
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186 unsigned int chansize; /* the number of Channel*s allocated for channels */
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187 unsigned int chancount; /* the number of Channel*s in use */
6
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188 const struct ChanType **chantypes; /* The valid channel types */
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189
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190
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191 /* TCP forwarding - where manage listeners */
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192 struct Listener ** listeners;
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193 unsigned int listensize;
156
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194
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195 /* Whether to allow binding to privileged ports (<1024). This doesn't
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196 * really belong here, but nowhere else fits nicely */
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197 int allowprivport;
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198
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199 };
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200
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201 struct serversession {
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202
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203 /* Server specific options */
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204 int childpipe; /* kept open until we successfully authenticate */
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205 /* userauth */
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206
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207 struct ChildPid * childpids; /* array of mappings childpid<->channel */
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208 unsigned int childpidsize;
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209
130
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210 /* Used to avoid a race in the exit returncode handling - see
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211 * svr-chansession.c for details */
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212 struct exitinfo lastexit;
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213
158
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214 /* The numeric address they connected from, used for logging */
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215 char * addrstring;
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216
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217 /* The resolved remote address, used for lastlog etc */
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218 char *remotehost;
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219
553
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220 #ifdef __uClinux__
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221 pid_t server_pid;
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222 #endif
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223
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224 };
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225
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226 typedef enum {
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227 KEX_NOTHING,
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228 KEXINIT_RCVD,
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229 KEXDH_INIT_SENT,
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230 KEXDONE
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231 } cli_kex_state;
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232
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233 typedef enum {
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234 STATE_NOTHING,
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235 SERVICE_AUTH_REQ_SENT,
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236 SERVICE_AUTH_ACCEPT_RCVD,
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237 SERVICE_CONN_REQ_SENT,
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238 SERVICE_CONN_ACCEPT_RCVD,
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239 USERAUTH_REQ_SENT,
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240 USERAUTH_FAIL_RCVD,
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241 USERAUTH_SUCCESS_RCVD,
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242 SESSION_RUNNING
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243 } cli_state;
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244
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245 struct clientsession {
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246
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247 mp_int *dh_e, *dh_x; /* Used during KEX */
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248 cli_kex_state kex_state; /* Used for progressing KEX */
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249 cli_state state; /* Used to progress auth/channelsession etc */
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250 unsigned donefirstkex : 1; /* Set when we set sentnewkeys, never reset */
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251
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252 int tty_raw_mode; /* Whether we're in raw mode (and have to clean up) */
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253 struct termios saved_tio;
93
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254 int stdincopy;
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255 int stdinflags;
175
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256 int stdoutcopy;
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257 int stdoutflags;
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258 int stderrcopy;
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259 int stderrflags;
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260
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261 int winchange; /* Set to 1 when a windowchange signal happens */
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262
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263 int lastauthtype; /* either AUTH_TYPE_PUBKEY or AUTH_TYPE_PASSWORD,
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264 for the last type of auth we tried */
249
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265 #ifdef ENABLE_CLI_INTERACT_AUTH
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266 int auth_interact_failed; /* flag whether interactive auth can still
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267 be used */
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268 int interact_request_received; /* flag whether we've received an
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269 info request from the server for
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270 interactive auth.*/
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271 #endif
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272 sign_key *lastprivkey;
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273
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274 int retval; /* What the command exit status was - we emulate it */
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275 #if 0
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276 TODO
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277 struct AgentkeyList *agentkeys; /* Keys to use for public-key auth */
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278 #endif
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279
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280 };
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281
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282 /* Global structs storing the state */
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283 extern struct sshsession ses;
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284
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285 #ifdef DROPBEAR_SERVER
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286 extern struct serversession svr_ses;
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287 #endif /* DROPBEAR_SERVER */
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288
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289 #ifdef DROPBEAR_CLIENT
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290 extern struct clientsession cli_ses;
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291 #endif /* DROPBEAR_CLIENT */
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293 #endif /* _SESSION_H_ */