Mercurial > dropbear

annotate session.h @ 27:08da099e8337

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- Rename common-packet.c to packet.c - buf_burn the unencrypted read/write payload buffers after use to avoid sensitive contents sitting in memory for too long
author Matt Johnston <matt@ucc.asn.au>
date Tue, 27 Jul 2004 02:14:42 +0000
parents 0969767bca0d
children f789045062e6
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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
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39 extern int sessinitdone; /* Is set to 0 somewhere */
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40 extern int exitflag;
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41
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42 void common_session_init(int sock, char* remotehost);
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43 void session_loop(void(*loophandler)());
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44 void common_session_cleanup();
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45 void checktimeouts();
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46 void session_identification();
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47
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48 extern void(*session_remoteclosed)();
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49
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50 /* Server */
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51 void svr_session(int sock, int childpipe, char *remotehost);
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52 void svr_dropbear_exit(int exitcode, const char* format, va_list param);
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53 void svr_dropbear_log(int priority, const char* format, va_list param);
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54
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55 /* Client */
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56 void cli_session(int sock, char *remotehost);
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57 void cli_dropbear_exit(int exitcode, const char* format, va_list param);
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58 void cli_dropbear_log(int priority, const char* format, va_list param);
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60 struct key_context {
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61
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62 const struct dropbear_cipher *recv_algo_crypt; /* NULL for none */
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63 const struct dropbear_cipher *trans_algo_crypt; /* NULL for none */
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64 const struct dropbear_hash *recv_algo_mac; /* NULL for none */
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65 const struct dropbear_hash *trans_algo_mac; /* NULL for none */
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66 char algo_kex;
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67 char algo_hostkey;
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68
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69 char recv_algo_comp; /* compression */
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70 char trans_algo_comp;
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71 #ifndef DISABLE_ZLIB
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72 z_streamp recv_zstream;
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73 z_streamp trans_zstream;
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74 #endif
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75
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76 /* actual keys */
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77 symmetric_CBC recv_symmetric_struct;
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78 symmetric_CBC trans_symmetric_struct;
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79 unsigned char recvmackey[MAX_MAC_KEY];
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80 unsigned char transmackey[MAX_MAC_KEY];
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81
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82 };
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83
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84 struct sshsession {
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85
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86 /* Is it a client or server? */
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87 unsigned char isserver;
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88
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89 long connecttimeout; /* time to disconnect if we have a timeout (for
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90 userauth etc), or 0 for no timeout */
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91
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92 int sock;
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93
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94 unsigned char *remotehost; /* the peer hostname */
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95
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96 unsigned char *remoteident;
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97
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98 int maxfd; /* the maximum file descriptor to check with select() */
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99
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100
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101 /* Packet buffers/values etc */
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102 buffer *writepayload; /* Unencrypted payload to write - this is used
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103 throughout the code, as handlers fill out this
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104 buffer with the packet to send. */
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105 struct Queue writequeue; /* A queue of encrypted packets to send */
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106 buffer *readbuf; /* Encrypted */
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107 buffer *decryptreadbuf; /* Post-decryption */
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108 buffer *payload; /* Post-decompression, the actual SSH packet */
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109 unsigned int transseq, recvseq; /* Sequence IDs */
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110
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111 /* Packet-handling flags */
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112 const packettype * packettypes; /* Packet handler mappings for this
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113 session, see process-packet.c */
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114
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115 unsigned dataallowed : 1; /* whether we can send data packets or we are in
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116 the middle of a KEX or something */
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117
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118 unsigned char requirenext; /* byte indicating what packet we require next,
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119 or 0x00 for any */
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120
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121 unsigned char ignorenext; /* whether to ignore the next packet,
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122 used for kex_follows stuff */
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123
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125
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126 /* KEX/encryption related */
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127 struct KEXState kexstate;
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128 struct key_context *keys;
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129 struct key_context *newkeys;
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130 unsigned char *session_id; /* this is the hash from the first kex */
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131 /* The below are used temorarily during kex, are freed after use */
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132 mp_int * dh_K; /* SSH_MSG_KEXDH_REPLY and sending SSH_MSH_NEWKEYS */
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133 unsigned char hash[SHA1_HASH_SIZE]; /* the hash*/
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134 buffer* kexhashbuf; /* session hash buffer calculated from various packets*/
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135 buffer* transkexinit; /* the kexinit packet we send should be kept so we
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136 can add it to the hash when generating keys */
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137
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138
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139 unsigned char authdone; /* Indicates when authentication has been
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140 completed. This applies to both client and
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141 server - in the server it gets set to 1 when
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142 authentication is successful, in the client it
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143 is set when the server has told us that auth
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144 succeeded */
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145
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146 /* Channel related */
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147 struct Channel ** channels; /* these pointers may be null */
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148 unsigned int chansize; /* the number of Channel*s allocated for channels */
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149 const struct ChanType **chantypes; /* The valid channel types */
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150
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151
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152 /* TCP forwarding - where manage listeners */
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153 #ifdef USING_LISTENERS
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154 struct Listener ** listeners;
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155 unsigned int listensize;
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156 /* Whether to allow binding to privileged ports (<1024). This doesn't
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157 * really belong here, but nowhere else fits nicely */
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158 #endif
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159 int allowprivport;
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160
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161 };
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162
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163 struct serversession {
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164
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165 /* Server specific options */
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166 int childpipe; /* kept open until we successfully authenticate */
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167 /* userauth */
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168 struct AuthState authstate;
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169
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170 struct ChildPid * childpids; /* array of mappings childpid<->channel */
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171 unsigned int childpidsize;
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172
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173 };
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174
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175 typedef enum {
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176 NOTHING,
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177 KEXINIT_RCVD,
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178 KEXDH_INIT_SENT,
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179 KEXDH_REPLY_RCVD,
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180
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181 } cli_state;
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182
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183 struct clientsession {
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184
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185 mp_int *dh_e, *dh_x; /* Used during KEX */
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186 cli_state state; /* Used to progress the KEX/auth/channelsession etc */
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187 int something; /* XXX */
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188 unsigned donefirstkex : 1; /* Set when we set sentnewkeys, never reset */
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189
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190 };
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191
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192 /* Global structs storing the state */
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193 extern struct sshsession ses;
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194
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195 #ifdef DROPBEAR_SERVER
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196 extern struct serversession svr_ses;
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197 #endif /* DROPBEAR_SERVER */
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198
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199 #ifdef DROPBEAR_CLIENT
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200 extern struct clientsession cli_ses;
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201 #endif /* DROPBEAR_CLIENT */
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202
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203 #endif /* _SESSION_H_ */