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annotate session.h @ 4:fe6bca95afa7

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author Matt Johnston <matt@ucc.asn.au>
date Tue, 01 Jun 2004 02:46:09 +0000
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children bc6477a6c393
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4
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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 "buffer.h"
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30 #include "signkey.h"
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31 #include "kex.h"
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32 #include "auth.h"
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33 #include "channel.h"
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34 #include "queue.h"
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35 #include "runopts.h"
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36 #include "remotetcpfwd.h"
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37
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38 extern int sessinitdone; /* Is set to 0 somewhere */
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39 extern int exitflag;
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40
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41 void common_session_init(int sock, runopts *opts);
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42 void common_session_cleanup();
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43 void checktimeouts();
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44 void session_identification();
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45
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46 extern void(*session_remoteclosed)();
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47
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48 /* Server */
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49 void svr_session(int sock, runopts *opts, int childpipe,
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50 struct sockaddr *remoteaddr);
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51
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52 struct key_context {
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53
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54 const struct dropbear_cipher *recv_algo_crypt; /* NULL for none */
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55 const struct dropbear_cipher *trans_algo_crypt; /* NULL for none */
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56 const struct dropbear_hash *recv_algo_mac; /* NULL for none */
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57 const struct dropbear_hash *trans_algo_mac; /* NULL for none */
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58 char algo_kex;
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59 char algo_hostkey;
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60
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61 char recv_algo_comp; /* compression */
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62 char trans_algo_comp;
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63 #ifndef DISABLE_ZLIB
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64 z_streamp recv_zstream;
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65 z_streamp trans_zstream;
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66 #endif
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67
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68 /* actual keys */
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69 symmetric_CBC recv_symmetric_struct;
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70 symmetric_CBC trans_symmetric_struct;
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71 unsigned char recvmackey[MAX_MAC_KEY];
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72 unsigned char transmackey[MAX_MAC_KEY];
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73
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74 };
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75
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76 struct sshsession {
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77
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78 /* Is it a client or server? */
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79 unsigned char isserver;
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80
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81 runopts * opts; /* runtime options, incl hostkey, banner etc */
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82
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83 long connecttimeout; /* time to disconnect if we have a timeout (for
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84 userauth etc), or 0 for no timeout */
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85
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86 int sock;
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87
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88 struct sockaddr *remoteaddr;
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89 unsigned char *remotehost; /* the peer hostname */
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90 unsigned char *remoteident;
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91
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92 int maxfd; /* the maximum file descriptor to check with select() */
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93
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94
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95 /* Packet buffers/values etc */
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96 buffer *writepayload; /* Unencrypted payload to write - this is used
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97 throughout the code, as handlers fill out this
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98 buffer with the packet to send. */
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99 struct Queue writequeue; /* A queue of encrypted packets to send */
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100 buffer *readbuf; /* Encrypted */
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101 buffer *decryptreadbuf; /* Post-decryption */
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102 buffer *payload; /* Post-decompression, the actual SSH packet */
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103 unsigned int transseq, recvseq; /* Sequence IDs */
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104
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105 /* Packet-handling flags */
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106 unsigned dataallowed : 1; /* whether we can send data packets or we are in
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107 the middle of a KEX or something */
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108
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109 unsigned char expecting; /* byte indicating what packet we expect next,
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110 or 0x00 for any */
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111
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112 unsigned char ignorenext; /* whether to ignore the next packet,
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113 used for kex_follows stuff */
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114
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115
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116
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117 /* KEX/encryption related */
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118 struct KEXState kexstate;
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119 struct key_context *keys;
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120 struct key_context *newkeys;
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121 unsigned char *session_id; /* this is the hash from the first kex */
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122 /* The below are used temorarily during kex, are freed after use */
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123 mp_int * dh_K; /* SSH_MSG_KEXDH_REPLY and sending SSH_MSH_NEWKEYS */
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124 unsigned char hash[SHA1_HASH_SIZE]; /* the hash*/
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125 buffer* kexhashbuf; /* session hash buffer calculated from various packets*/
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126 buffer* transkexinit; /* the kexinit packet we send should be kept so we
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127 can add it to the hash when generating keys */
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128
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129
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130
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131 /* Channel related */
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132 struct Channel ** channels; /* these pointers may be null */
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133 unsigned int chansize; /* the number of Channel*s allocated for channels */
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134 struct ChanType **chantypes; /* The valid channel types */
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135
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136
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137 /* TCP forwarding - where manage listeners */
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138 #ifndef DISABLE_REMOTETCPFWD
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139 struct TCPListener ** tcplisteners;
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140 unsigned int tcplistensize;
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141 #endif
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142
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143 };
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144
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145 struct serversession {
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146
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147 /* Server specific options */
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148 int childpipe; /* kept open until we successfully authenticate */
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149 /* userauth */
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150 struct AuthState authstate;
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151
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152 struct ChildPid * childpids; /* array of mappings childpid<->channel */
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153 unsigned int childpidsize;
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154
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155 };
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158
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159 struct clientsession {
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160
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161 int something; /* XXX */
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162
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163 };
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164
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165 /* Global structs storing the state */
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166 extern struct sshsession ses;
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167
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168 #ifdef DROPBEAR_SERVER
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169 extern struct serversession svr_ses;
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170 #endif /* DROPBEAR_SERVER */
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171
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172 #ifdef DROPBEAR_CLIENT
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173 extern struct serversession cli_ses;
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174 #endif /* DROPBEAR_CLIENT */
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175
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176 #endif /* _SESSION_H_ */