Mercurial > dropbear
annotate session.h @ 516:7fc4ba3c1cbb
- Bump to 0.52
- Clarify that hosts are resolved on the remote end for multihop
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 11 Nov 2008 14:08:48 +0000 |
parents | a3748e54273c |
children | 0431915df79f 76097ec1a29a |
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" |
64 | 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, char* remotehost); |
26 | 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 |
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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, char *remotehost, char *addrstring); |
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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 |
26 | 58 /* Client */ |
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59 void cli_session(int sock_in, int sock_out, char *remotehost); |
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60 void cli_session_cleanup(); |
43 | 61 void cleantext(unsigned char* dirtytext); |
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62 |
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63 struct key_context { |
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64 |
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65 const struct dropbear_cipher *recv_algo_crypt; /* NULL for none */ |
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66 const struct dropbear_cipher *trans_algo_crypt; /* NULL for none */ |
502 | 67 const struct dropbear_cipher_mode *recv_crypt_mode; |
68 const struct dropbear_cipher_mode *trans_crypt_mode; | |
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69 const struct dropbear_hash *recv_algo_mac; /* NULL for none */ |
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70 const struct dropbear_hash *trans_algo_mac; /* NULL for none */ |
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71 char algo_kex; |
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72 char algo_hostkey; |
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73 |
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74 char recv_algo_comp; /* compression */ |
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75 char trans_algo_comp; |
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76 int allow_compress; /* whether compression has started (useful in |
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77 [email protected] delayed compression case) */ |
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78 #ifndef DISABLE_ZLIB |
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79 z_streamp recv_zstream; |
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80 z_streamp trans_zstream; |
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81 #endif |
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82 |
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83 /* actual keys */ |
502 | 84 union { |
85 symmetric_CBC cbc; | |
86 #ifdef DROPBEAR_ENABLE_CTR_MODE | |
87 symmetric_CTR ctr; | |
88 #endif | |
89 } recv_cipher_state; | |
90 union { | |
91 symmetric_CBC cbc; | |
92 #ifdef DROPBEAR_ENABLE_CTR_MODE | |
93 symmetric_CTR ctr; | |
94 #endif | |
95 } trans_cipher_state; | |
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96 unsigned char recvmackey[MAX_MAC_KEY]; |
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97 unsigned char transmackey[MAX_MAC_KEY]; |
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98 |
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99 }; |
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100 |
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101 struct packetlist; |
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102 struct packetlist { |
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103 struct packetlist *next; |
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104 buffer * payload; |
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105 }; |
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106 |
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107 struct sshsession { |
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108 |
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109 /* Is it a client or server? */ |
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110 unsigned char isserver; |
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111 |
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112 time_t connect_time; /* time the connection was established |
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113 (cleared after auth once we're not |
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114 respecting AUTH_TIMEOUT any more) */ |
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115 |
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116 int sock_in; |
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117 int sock_out; |
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118 |
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119 unsigned char *remotehost; /* the peer hostname */ |
26 | 120 |
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121 unsigned char *remoteident; |
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122 |
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123 int maxfd; /* the maximum file descriptor to check with select() */ |
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124 |
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125 |
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126 /* Packet buffers/values etc */ |
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127 buffer *writepayload; /* Unencrypted payload to write - this is used |
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128 throughout the code, as handlers fill out this |
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129 buffer with the packet to send. */ |
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130 struct Queue writequeue; /* A queue of encrypted packets to send */ |
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131 buffer *readbuf; /* Encrypted */ |
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132 buffer *decryptreadbuf; /* Post-decryption */ |
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133 buffer *payload; /* Post-decompression, the actual SSH packet */ |
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134 unsigned int transseq, recvseq; /* Sequence IDs */ |
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135 |
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136 /* Packet-handling flags */ |
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137 const packettype * packettypes; /* Packet handler mappings for this |
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138 session, see process-packet.c */ |
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139 |
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140 unsigned dataallowed : 1; /* whether we can send data packets or we are in |
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141 the middle of a KEX or something */ |
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142 |
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143 unsigned char requirenext; /* byte indicating what packet we require next, |
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144 or 0x00 for any */ |
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145 |
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146 unsigned char ignorenext; /* whether to ignore the next packet, |
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147 used for kex_follows stuff */ |
34
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148 |
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149 unsigned char lastpacket; /* What the last received packet type was */ |
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150 |
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151 int signal_pipe[2]; /* stores endpoints of a self-pipe used for |
416
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152 race-free signal handling */ |
454
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153 |
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154 time_t last_trx_packet_time; /* time of the last packet transmission, for |
454
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155 keepalive purposes */ |
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156 |
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157 time_t last_packet_time; /* time of the last packet transmission or receive, for |
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158 idle timeout purposes */ |
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159 |
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160 |
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161 /* KEX/encryption related */ |
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162 struct KEXState kexstate; |
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163 struct key_context *keys; |
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164 struct key_context *newkeys; |
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165 unsigned char *session_id; /* this is the hash from the first kex */ |
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166 /* The below are used temorarily during kex, are freed after use */ |
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167 mp_int * dh_K; /* SSH_MSG_KEXDH_REPLY and sending SSH_MSH_NEWKEYS */ |
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168 unsigned char hash[SHA1_HASH_SIZE]; /* the hash*/ |
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169 buffer* kexhashbuf; /* session hash buffer calculated from various packets*/ |
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170 buffer* transkexinit; /* the kexinit packet we send should be kept so we |
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171 can add it to the hash when generating keys */ |
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172 |
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173 /* a list of queued replies that should be sent after a KEX has |
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174 concluded (ie, while dataallowed was unset)*/ |
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175 struct packetlist *reply_queue_head, *reply_queue_tail; |
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176 |
33 | 177 algo_type*(*buf_match_algo)(buffer*buf, algo_type localalgos[], |
178 int *goodguess); /* The function to use to choose which algorithm | |
179 to use from the ones presented by the remote | |
180 side. Is specific to the client/server mode, | |
181 hence the function-pointer callback.*/ | |
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182 |
33 | 183 void(*remoteclosed)(); /* A callback to handle closure of the |
184 remote connection */ | |
185 | |
186 | |
187 struct AuthState authstate; /* Common amongst client and server, since most | |
188 struct elements are common */ | |
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189 |
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190 /* Channel related */ |
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191 struct Channel ** channels; /* these pointers may be null */ |
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192 unsigned int chansize; /* the number of Channel*s allocated for channels */ |
37 | 193 unsigned int chancount; /* the number of Channel*s in use */ |
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194 const struct ChanType **chantypes; /* The valid channel types */ |
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195 |
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196 |
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197 /* TCP forwarding - where manage listeners */ |
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198 struct Listener ** listeners; |
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199 unsigned int listensize; |
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200 |
21
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201 /* Whether to allow binding to privileged ports (<1024). This doesn't |
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202 * really belong here, but nowhere else fits nicely */ |
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203 int allowprivport; |
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204 |
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205 }; |
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206 |
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207 struct serversession { |
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208 |
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209 /* Server specific options */ |
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210 int childpipe; /* kept open until we successfully authenticate */ |
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211 /* userauth */ |
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212 |
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213 struct ChildPid * childpids; /* array of mappings childpid<->channel */ |
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214 unsigned int childpidsize; |
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215 |
130
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216 /* Used to avoid a race in the exit returncode handling - see |
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217 * svr-chansession.c for details */ |
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218 struct exitinfo lastexit; |
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219 |
158
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220 /* The numeric address they connected from, used for logging */ |
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221 char * addrstring; |
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222 |
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223 }; |
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224 |
26 | 225 typedef enum { |
33 | 226 KEX_NOTHING, |
26 | 227 KEXINIT_RCVD, |
228 KEXDH_INIT_SENT, | |
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229 KEXDONE |
33 | 230 } cli_kex_state; |
231 | |
232 typedef enum { | |
233 STATE_NOTHING, | |
234 SERVICE_AUTH_REQ_SENT, | |
235 SERVICE_AUTH_ACCEPT_RCVD, | |
236 SERVICE_CONN_REQ_SENT, | |
237 SERVICE_CONN_ACCEPT_RCVD, | |
238 USERAUTH_REQ_SENT, | |
239 USERAUTH_FAIL_RCVD, | |
37 | 240 USERAUTH_SUCCESS_RCVD, |
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241 SESSION_RUNNING |
26 | 242 } cli_state; |
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243 |
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244 struct clientsession { |
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245 |
26 | 246 mp_int *dh_e, *dh_x; /* Used during KEX */ |
33 | 247 cli_kex_state kex_state; /* Used for progressing KEX */ |
248 cli_state state; /* Used to progress auth/channelsession etc */ | |
26 | 249 unsigned donefirstkex : 1; /* Set when we set sentnewkeys, never reset */ |
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250 |
39
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251 int tty_raw_mode; /* Whether we're in raw mode (and have to clean up) */ |
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252 struct termios saved_tio; |
93
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253 int stdincopy; |
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254 int stdinflags; |
175
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255 int stdoutcopy; |
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256 int stdoutflags; |
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257 int stderrcopy; |
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258 int stderrflags; |
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259 |
41
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260 int winchange; /* Set to 1 when a windowchange signal happens */ |
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261 |
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262 int lastauthtype; /* either AUTH_TYPE_PUBKEY or AUTH_TYPE_PASSWORD, |
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263 for the last type of auth we tried */ |
249
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264 #ifdef ENABLE_CLI_INTERACT_AUTH |
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265 int auth_interact_failed; /* flag whether interactive auth can still |
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266 be used */ |
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267 int interact_request_received; /* flag whether we've received an |
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268 info request from the server for |
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269 interactive auth.*/ |
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270 #endif |
215
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271 struct SignKeyList *lastprivkey; |
108
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272 |
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273 int retval; /* What the command exit status was - we emulate it */ |
45
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274 #if 0 |
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275 TODO |
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276 struct AgentkeyList *agentkeys; /* Keys to use for public-key auth */ |
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277 #endif |
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278 |
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279 }; |
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280 |
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281 /* Global structs storing the state */ |
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282 extern struct sshsession ses; |
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283 |
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284 #ifdef DROPBEAR_SERVER |
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285 extern struct serversession svr_ses; |
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286 #endif /* DROPBEAR_SERVER */ |
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287 |
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288 #ifdef DROPBEAR_CLIENT |
26 | 289 extern struct clientsession cli_ses; |
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290 #endif /* DROPBEAR_CLIENT */ |
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291 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
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292 #endif /* _SESSION_H_ */ |