Mercurial > dropbear
annotate session.h @ 501:d58c478bd399
Add support for [email protected] delayed compression.
Are still advertising 'zlib' for the server, need to allow
delayed-only as an option
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Mon, 29 Sep 2008 02:23:04 +0000 |
| parents | 738313e73b1c |
| children | 43bbe17d6ba0 |
| 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 */ |
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67 const struct dropbear_hash *recv_algo_mac; /* NULL for none */ |
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68 const struct dropbear_hash *trans_algo_mac; /* NULL for none */ |
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69 char algo_kex; |
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70 char algo_hostkey; |
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71 |
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72 char recv_algo_comp; /* compression */ |
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73 char trans_algo_comp; |
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74 int allow_compress; /* whether compression has started (useful in |
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75 [email protected] delayed compression case) */ |
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76 #ifndef DISABLE_ZLIB |
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77 z_streamp recv_zstream; |
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78 z_streamp trans_zstream; |
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79 #endif |
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80 |
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81 /* actual keys */ |
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82 symmetric_CBC recv_symmetric_struct; |
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83 symmetric_CBC trans_symmetric_struct; |
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84 unsigned char recvmackey[MAX_MAC_KEY]; |
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85 unsigned char transmackey[MAX_MAC_KEY]; |
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86 |
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87 }; |
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88 |
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89 struct packetlist; |
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90 struct packetlist { |
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91 struct packetlist *next; |
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92 buffer * payload; |
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93 }; |
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94 |
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95 struct sshsession { |
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96 |
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97 /* Is it a client or server? */ |
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98 unsigned char isserver; |
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99 |
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100 time_t connect_time; /* time the connection was established |
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101 (cleared after auth once we're not |
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102 respecting AUTH_TIMEOUT any more) */ |
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103 |
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104 int sock_in; |
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105 int sock_out; |
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106 |
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107 unsigned char *remotehost; /* the peer hostname */ |
| 26 | 108 |
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109 unsigned char *remoteident; |
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110 |
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111 int maxfd; /* the maximum file descriptor to check with select() */ |
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112 |
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113 |
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114 /* Packet buffers/values etc */ |
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115 buffer *writepayload; /* Unencrypted payload to write - this is used |
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116 throughout the code, as handlers fill out this |
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117 buffer with the packet to send. */ |
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118 struct Queue writequeue; /* A queue of encrypted packets to send */ |
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119 buffer *readbuf; /* Encrypted */ |
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120 buffer *decryptreadbuf; /* Post-decryption */ |
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121 buffer *payload; /* Post-decompression, the actual SSH packet */ |
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122 unsigned int transseq, recvseq; /* Sequence IDs */ |
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123 |
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124 /* Packet-handling flags */ |
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125 const packettype * packettypes; /* Packet handler mappings for this |
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126 session, see process-packet.c */ |
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127 |
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128 unsigned dataallowed : 1; /* whether we can send data packets or we are in |
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129 the middle of a KEX or something */ |
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130 |
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131 unsigned char requirenext; /* byte indicating what packet we require next, |
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132 or 0x00 for any */ |
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133 |
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134 unsigned char ignorenext; /* whether to ignore the next packet, |
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135 used for kex_follows stuff */ |
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136 |
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137 unsigned char lastpacket; /* What the last received packet type was */ |
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138 |
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139 int signal_pipe[2]; /* stores endpoints of a self-pipe used for |
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140 race-free signal handling */ |
|
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141 |
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142 time_t last_packet_time; /* time of the last packet transmission, for |
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143 keepalive purposes */ |
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144 |
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145 /* KEX/encryption related */ |
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146 struct KEXState kexstate; |
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147 struct key_context *keys; |
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148 struct key_context *newkeys; |
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149 unsigned char *session_id; /* this is the hash from the first kex */ |
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150 /* The below are used temorarily during kex, are freed after use */ |
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151 mp_int * dh_K; /* SSH_MSG_KEXDH_REPLY and sending SSH_MSH_NEWKEYS */ |
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152 unsigned char hash[SHA1_HASH_SIZE]; /* the hash*/ |
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153 buffer* kexhashbuf; /* session hash buffer calculated from various packets*/ |
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154 buffer* transkexinit; /* the kexinit packet we send should be kept so we |
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155 can add it to the hash when generating keys */ |
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156 |
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157 /* a list of queued replies that should be sent after a KEX has |
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158 concluded (ie, while dataallowed was unset)*/ |
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159 struct packetlist *reply_queue_head, *reply_queue_tail; |
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160 |
| 33 | 161 algo_type*(*buf_match_algo)(buffer*buf, algo_type localalgos[], |
| 162 int *goodguess); /* The function to use to choose which algorithm | |
| 163 to use from the ones presented by the remote | |
| 164 side. Is specific to the client/server mode, | |
| 165 hence the function-pointer callback.*/ | |
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166 |
| 33 | 167 void(*remoteclosed)(); /* A callback to handle closure of the |
| 168 remote connection */ | |
| 169 | |
| 170 | |
| 171 struct AuthState authstate; /* Common amongst client and server, since most | |
| 172 struct elements are common */ | |
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173 |
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174 /* Channel related */ |
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175 struct Channel ** channels; /* these pointers may be null */ |
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176 unsigned int chansize; /* the number of Channel*s allocated for channels */ |
| 37 | 177 unsigned int chancount; /* the number of Channel*s in use */ |
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178 const struct ChanType **chantypes; /* The valid channel types */ |
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179 |
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180 |
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181 /* TCP forwarding - where manage listeners */ |
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182 struct Listener ** listeners; |
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183 unsigned int listensize; |
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184 |
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185 /* Whether to allow binding to privileged ports (<1024). This doesn't |
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186 * really belong here, but nowhere else fits nicely */ |
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187 int allowprivport; |
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188 |
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189 }; |
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190 |
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191 struct serversession { |
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192 |
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193 /* Server specific options */ |
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194 int childpipe; /* kept open until we successfully authenticate */ |
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195 /* userauth */ |
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196 |
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197 struct ChildPid * childpids; /* array of mappings childpid<->channel */ |
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198 unsigned int childpidsize; |
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199 |
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200 /* Used to avoid a race in the exit returncode handling - see |
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201 * svr-chansession.c for details */ |
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202 struct exitinfo lastexit; |
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203 |
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204 /* The numeric address they connected from, used for logging */ |
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205 char * addrstring; |
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206 |
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207 }; |
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208 |
| 26 | 209 typedef enum { |
| 33 | 210 KEX_NOTHING, |
| 26 | 211 KEXINIT_RCVD, |
| 212 KEXDH_INIT_SENT, | |
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213 KEXDONE |
| 33 | 214 } cli_kex_state; |
| 215 | |
| 216 typedef enum { | |
| 217 STATE_NOTHING, | |
| 218 SERVICE_AUTH_REQ_SENT, | |
| 219 SERVICE_AUTH_ACCEPT_RCVD, | |
| 220 SERVICE_CONN_REQ_SENT, | |
| 221 SERVICE_CONN_ACCEPT_RCVD, | |
| 222 USERAUTH_REQ_SENT, | |
| 223 USERAUTH_FAIL_RCVD, | |
| 37 | 224 USERAUTH_SUCCESS_RCVD, |
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225 SESSION_RUNNING |
| 26 | 226 } cli_state; |
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227 |
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228 struct clientsession { |
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229 |
| 26 | 230 mp_int *dh_e, *dh_x; /* Used during KEX */ |
| 33 | 231 cli_kex_state kex_state; /* Used for progressing KEX */ |
| 232 cli_state state; /* Used to progress auth/channelsession etc */ | |
| 26 | 233 unsigned donefirstkex : 1; /* Set when we set sentnewkeys, never reset */ |
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234 |
|
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235 int tty_raw_mode; /* Whether we're in raw mode (and have to clean up) */ |
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236 struct termios saved_tio; |
|
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237 int stdincopy; |
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238 int stdinflags; |
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175
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239 int stdoutcopy; |
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240 int stdoutflags; |
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241 int stderrcopy; |
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242 int stderrflags; |
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243 |
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41
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244 int winchange; /* Set to 1 when a windowchange signal happens */ |
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245 |
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246 int lastauthtype; /* either AUTH_TYPE_PUBKEY or AUTH_TYPE_PASSWORD, |
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247 for the last type of auth we tried */ |
|
249
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248 #ifdef ENABLE_CLI_INTERACT_AUTH |
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249 int auth_interact_failed; /* flag whether interactive auth can still |
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250 be used */ |
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251 int interact_request_received; /* flag whether we've received an |
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252 info request from the server for |
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253 interactive auth.*/ |
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254 #endif |
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255 struct SignKeyList *lastprivkey; |
|
108
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256 |
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257 int retval; /* What the command exit status was - we emulate it */ |
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258 #if 0 |
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259 TODO |
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260 struct AgentkeyList *agentkeys; /* Keys to use for public-key auth */ |
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261 #endif |
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262 |
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263 }; |
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264 |
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265 /* Global structs storing the state */ |
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266 extern struct sshsession ses; |
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267 |
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268 #ifdef DROPBEAR_SERVER |
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269 extern struct serversession svr_ses; |
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270 #endif /* DROPBEAR_SERVER */ |
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271 |
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272 #ifdef DROPBEAR_CLIENT |
| 26 | 273 extern struct clientsession cli_ses; |
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274 #endif /* DROPBEAR_CLIENT */ |
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275 |
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276 #endif /* _SESSION_H_ */ |