Mercurial > dropbear

annotate session.h @ 801:7dcb46da72d9 ecc

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merge in HEAD
author Matt Johnston <matt@ucc.asn.au>
date Tue, 21 May 2013 12:09:35 +0800
parents ac2158e3e403 2f1c199b6e4b
children 6c69e7df3621
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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 #include "dbutil.h"
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41
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42 extern int sessinitdone; /* Is set to 0 somewhere */
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43 extern int exitflag;
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44
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45 void common_session_init(int sock_in, int sock_out);
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46 void session_loop(void(*loophandler)());
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47 void session_cleanup();
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48 void send_session_identification();
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49 void send_msg_ignore();
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50
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51 const char* get_user_shell();
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52 void fill_passwd(const char* username);
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53
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54 /* Server */
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55 void svr_session(int sock, int childpipe);
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56 void svr_dropbear_exit(int exitcode, const char* format, va_list param) ATTRIB_NORETURN;
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57 void svr_dropbear_log(int priority, const char* format, va_list param);
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58
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59 /* Client */
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60 void cli_session(int sock_in, int sock_out);
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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;
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66 const struct dropbear_cipher_mode *crypt_mode;
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67 const struct dropbear_hash *algo_mac;
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68 int hash_index; /* lookup for libtomcrypt */
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69 int 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_LEN];
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81 int valid;
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82 };
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83
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84 struct key_context {
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86 struct key_context_directional recv;
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87 struct key_context_directional trans;
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88
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89 const struct dropbear_kex *algo_kex;
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90 int algo_hostkey;
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91
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92 int allow_compress; /* whether compression has started (useful in
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93 [email protected] delayed compression case) */
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94 };
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95
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96 struct packetlist;
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97 struct packetlist {
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98 struct packetlist *next;
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99 buffer * payload;
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100 };
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101
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102 struct sshsession {
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103
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104 /* Is it a client or server? */
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105 unsigned char isserver;
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106
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107 time_t connect_time; /* time the connection was established
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108 (cleared after auth once we're not
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109 respecting AUTH_TIMEOUT any more) */
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110
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111 int sock_in;
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112 int sock_out;
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113
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114 /* remotehost will be initially NULL as we delay
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115 * reading the remote version string. it will be set
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116 * by the time any recv_() packet methods are called */
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117 unsigned char *remoteident;
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118
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119 int maxfd; /* the maximum file descriptor to check with select() */
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120
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121
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122 /* Packet buffers/values etc */
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123 buffer *writepayload; /* Unencrypted payload to write - this is used
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124 throughout the code, as handlers fill out this
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125 buffer with the packet to send. */
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126 struct Queue writequeue; /* A queue of encrypted packets to send */
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127 buffer *readbuf; /* From the wire, decrypted in-place */
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128 buffer *payload; /* Post-decompression, the actual SSH packet */
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129 unsigned int transseq, recvseq; /* Sequence IDs */
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130
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131 /* Packet-handling flags */
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132 const packettype * packettypes; /* Packet handler mappings for this
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133 session, see process-packet.c */
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134
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135 unsigned dataallowed : 1; /* whether we can send data packets or we are in
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136 the middle of a KEX or something */
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137
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138 unsigned char requirenext[2]; /* bytes indicating what packets we require next,
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139 or 0x00 for any. Second option can only be
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140 used if the first byte is also set */
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142 unsigned char ignorenext; /* whether to ignore the next packet,
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143 used for kex_follows stuff */
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144
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145 unsigned char lastpacket; /* What the last received packet type was */
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146
513
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
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147 int signal_pipe[2]; /* stores endpoints of a self-pipe used for
416
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148 race-free signal handling */
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149
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150 time_t last_trx_packet_time; /* time of the last packet transmission, for
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151 keepalive purposes */
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152
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153 time_t last_packet_time; /* time of the last packet transmission or receive, for
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154 idle timeout purposes */
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155
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156
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157 /* KEX/encryption related */
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158 struct KEXState kexstate;
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159 struct key_context *keys;
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160 struct key_context *newkeys;
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161 buffer *session_id; /* this is the hash from the first kex */
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162 /* The below are used temporarily during kex, are freed after use */
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163 mp_int * dh_K; /* SSH_MSG_KEXDH_REPLY and sending SSH_MSH_NEWKEYS */
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164 buffer *hash; /* the session hash */
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165 buffer* kexhashbuf; /* session hash buffer calculated from various packets*/
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166 buffer* transkexinit; /* the kexinit packet we send should be kept so we
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167 can add it to the hash when generating keys */
575
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168
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169 /* Enables/disables compression */
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170 algo_type *compress_algos;
452
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
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171
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172 /* a list of queued replies that should be sent after a KEX has
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173 concluded (ie, while dataallowed was unset)*/
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174 struct packetlist *reply_queue_head, *reply_queue_tail;
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175
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176 void(*remoteclosed)(); /* A callback to handle closure of the
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177 remote connection */
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178
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179 void(*extra_session_cleanup)(); /* client or server specific cleanup */
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180 void(*send_kex_first_guess)();
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181
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182 struct AuthState authstate; /* Common amongst client and server, since most
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183 struct elements are common */
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184
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185 /* Channel related */
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186 struct Channel ** channels; /* these pointers may be null */
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187 unsigned int chansize; /* the number of Channel*s allocated for channels */
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188 unsigned int chancount; /* the number of Channel*s in use */
6
ab00ef513e97 Sorted out the first channel init issues.
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189 const struct ChanType **chantypes; /* The valid channel types */
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190
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191
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192 /* TCP forwarding - where manage listeners */
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7f77962de998 - Reworked non-channel fd handling to listener.c
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193 struct Listener ** listeners;
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194 unsigned int listensize;
156
8c2b3506f112 Rearrange preprocessor parts so that compilation with various options
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195
21
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196 /* Whether to allow binding to privileged ports (<1024). This doesn't
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197 * really belong here, but nowhere else fits nicely */
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198 int allowprivport;
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199
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200 };
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201
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202 struct serversession {
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203
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204 /* Server specific options */
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205 int childpipe; /* kept open until we successfully authenticate */
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206 /* userauth */
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207
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208 struct ChildPid * childpids; /* array of mappings childpid<->channel */
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209 unsigned int childpidsize;
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210
130
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211 /* Used to avoid a race in the exit returncode handling - see
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212 * svr-chansession.c for details */
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213 struct exitinfo lastexit;
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214
158
364a75cfebab Log the IP along with auth success/fail attempts
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215 /* The numeric address they connected from, used for logging */
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216 char * addrstring;
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217
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218 /* The resolved remote address, used for lastlog etc */
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219 char *remotehost;
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220
667
fc7ae88e63b3 Rename HAVE_FORK to USE_VFORK
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221 #ifdef USE_VFORK
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8711f20b89ab - For uclinux, only cleanup on exit for the main process. This avoids
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222 pid_t server_pid;
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223 #endif
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224
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225 };
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226
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227 typedef enum {
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228 KEX_NOTHING,
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229 KEXINIT_RCVD,
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230 KEXDH_INIT_SENT,
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231 KEXDONE
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232 } cli_kex_state;
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233
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234 typedef enum {
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235 STATE_NOTHING,
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236 USERAUTH_REQ_SENT,
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237 USERAUTH_FAIL_RCVD,
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238 USERAUTH_SUCCESS_RCVD,
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239 SESSION_RUNNING
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240 } cli_state;
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241
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242 struct clientsession {
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243
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244 // XXX - move these to kexstate?
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245 struct kex_dh_param *dh_param;
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246 struct kex_ecdh_param *ecdh_param;
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247 const struct dropbear_kex *param_kex_algo; /* KEX algorithm corresponding to current dh_e and dh_x */
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248
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249 cli_kex_state kex_state; /* Used for progressing KEX */
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250 cli_state state; /* Used to progress auth/channelsession etc */
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251 unsigned donefirstkex : 1; /* Set when we set sentnewkeys, never reset */
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252
39
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253 int tty_raw_mode; /* Whether we're in raw mode (and have to clean up) */
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254 struct termios saved_tio;
93
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255 int stdincopy;
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256 int stdinflags;
175
2c5741e4b855 * Reset the non-blocking status of stdout and stderr as well on exit
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257 int stdoutcopy;
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258 int stdoutflags;
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259 int stderrcopy;
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260 int stderrflags;
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261
722
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262 /* for escape char handling */
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263 int last_char;
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264
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265 int winchange; /* Set to 1 when a windowchange signal happens */
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266
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267 int lastauthtype; /* either AUTH_TYPE_PUBKEY or AUTH_TYPE_PASSWORD,
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268 for the last type of auth we tried */
249
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269 #ifdef ENABLE_CLI_INTERACT_AUTH
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270 int auth_interact_failed; /* flag whether interactive auth can still
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271 be used */
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272 int interact_request_received; /* flag whether we've received an
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273 info request from the server for
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274 interactive auth.*/
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275
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276 int cipher_none_after_auth; /* Set to 1 if the user requested "none"
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277 auth */
249
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278 #endif
551
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279 sign_key *lastprivkey;
108
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280
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281 int retval; /* What the command exit status was - we emulate it */
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282 #if 0
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283 TODO
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284 struct AgentkeyList *agentkeys; /* Keys to use for public-key auth */
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285 #endif
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286
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287 };
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288
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289 /* Global structs storing the state */
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290 extern struct sshsession ses;
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291
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292 #ifdef DROPBEAR_SERVER
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293 extern struct serversession svr_ses;
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294 #endif /* DROPBEAR_SERVER */
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295
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296 #ifdef DROPBEAR_CLIENT
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297 extern struct clientsession cli_ses;
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298 #endif /* DROPBEAR_CLIENT */
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299
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300 #endif /* _SESSION_H_ */