Mercurial > dropbear
annotate session.h @ 26:0969767bca0d
snapshot of stuff
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 26 Jul 2004 02:44:20 +0000 |
parents | 469950e86d0f |
children | f789045062e6 |
rev | line source |
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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" |
26 | 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 |
26 | 42 void common_session_init(int sock, char* remotehost); |
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 */ |
26 | 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 |
26 | 55 /* Client */ |
56 void cli_session(int sock, char *remotehost); | |
57 void cli_dropbear_exit(int exitcode, const char* format, va_list param); | |
58 void cli_dropbear_log(int priority, const char* format, va_list param); | |
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59 |
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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 */ |
26 | 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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124 |
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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 |
26 | 175 typedef enum { |
176 NOTHING, | |
177 KEXINIT_RCVD, | |
178 KEXDH_INIT_SENT, | |
179 KEXDH_REPLY_RCVD, | |
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180 |
26 | 181 } cli_state; |
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182 |
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183 struct clientsession { |
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184 |
26 | 185 mp_int *dh_e, *dh_x; /* Used during KEX */ |
186 cli_state state; /* Used to progress the KEX/auth/channelsession etc */ | |
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187 int something; /* XXX */ |
26 | 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 |
26 | 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_ */ |