Mercurial > dropbear
annotate session.h @ 753:d63ef1e211ea
Take transmit and receive keys into use separately
| author | Matt Johnston <matt@ucc.asn.au> |
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| date | Thu, 04 Apr 2013 00:18:50 +0800 |
| parents | 077bbe1eb220 |
| children | 2f1c199b6e4b |
| 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 #include "dbutil.h" |
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41 |
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42 extern int sessinitdone; /* Is set to 0 somewhere */ |
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43 extern int exitflag; |
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44 |
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45 void common_session_init(int sock_in, int sock_out); |
| 26 | 46 void session_loop(void(*loophandler)()); |
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47 void session_cleanup(); |
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48 void send_session_identification(); |
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49 void send_msg_ignore(); |
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50 |
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51 const char* get_user_shell(); |
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52 void fill_passwd(const char* username); |
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53 |
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54 /* Server */ |
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55 void svr_session(int sock, int childpipe); |
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56 void svr_dropbear_exit(int exitcode, const char* format, va_list param) ATTRIB_NORETURN; |
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57 void svr_dropbear_log(int priority, const char* format, va_list param); |
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58 |
| 26 | 59 /* Client */ |
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60 void cli_session(int sock_in, int sock_out); |
| 43 | 61 void cleantext(unsigned char* dirtytext); |
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62 |
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63 /* crypto parameters that are stored individually for transmit and receive */ |
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64 struct key_context_directional { |
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65 const struct dropbear_cipher *algo_crypt; |
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66 const struct dropbear_cipher_mode *crypt_mode; |
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67 const struct dropbear_hash *algo_mac; |
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68 int hash_index; /* lookup for libtomcrypt */ |
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69 char algo_comp; /* compression */ |
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70 #ifndef DISABLE_ZLIB |
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71 z_streamp zstream; |
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72 #endif |
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73 /* actual keys */ |
| 502 | 74 union { |
| 75 symmetric_CBC cbc; | |
| 76 #ifdef DROPBEAR_ENABLE_CTR_MODE | |
| 77 symmetric_CTR ctr; | |
| 78 #endif | |
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79 } cipher_state; |
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80 unsigned char mackey[MAX_MAC_LEN]; |
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81 int valid; |
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82 }; |
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83 |
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84 struct key_context { |
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85 |
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86 struct key_context_directional recv; |
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87 struct key_context_directional trans; |
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88 |
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89 char algo_kex; |
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90 char algo_hostkey; |
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91 |
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92 int allow_compress; /* whether compression has started (useful in |
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93 [email protected] delayed compression case) */ |
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94 }; |
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95 |
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96 struct packetlist; |
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97 struct packetlist { |
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98 struct packetlist *next; |
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99 buffer * payload; |
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100 }; |
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101 |
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102 struct sshsession { |
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103 |
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104 /* Is it a client or server? */ |
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105 unsigned char isserver; |
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106 |
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107 time_t connect_time; /* time the connection was established |
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108 (cleared after auth once we're not |
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109 respecting AUTH_TIMEOUT any more) */ |
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110 |
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111 int sock_in; |
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112 int sock_out; |
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113 |
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114 /* remotehost will be initially NULL as we delay |
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115 * reading the remote version string. it will be set |
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116 * by the time any recv_() packet methods are called */ |
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117 unsigned char *remoteident; |
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118 |
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119 int maxfd; /* the maximum file descriptor to check with select() */ |
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120 |
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121 |
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122 /* Packet buffers/values etc */ |
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123 buffer *writepayload; /* Unencrypted payload to write - this is used |
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124 throughout the code, as handlers fill out this |
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125 buffer with the packet to send. */ |
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126 struct Queue writequeue; /* A queue of encrypted packets to send */ |
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127 buffer *readbuf; /* From the wire, decrypted in-place */ |
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128 buffer *payload; /* Post-decompression, the actual SSH packet */ |
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129 unsigned int transseq, recvseq; /* Sequence IDs */ |
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130 |
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131 /* Packet-handling flags */ |
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132 const packettype * packettypes; /* Packet handler mappings for this |
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133 session, see process-packet.c */ |
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134 |
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135 unsigned dataallowed : 1; /* whether we can send data packets or we are in |
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136 the middle of a KEX or something */ |
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137 |
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138 unsigned char requirenext; /* byte indicating what packet we require next, |
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139 or 0x00 for any */ |
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140 |
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141 unsigned char ignorenext; /* whether to ignore the next packet, |
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142 used for kex_follows stuff */ |
|
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143 |
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144 unsigned char lastpacket; /* What the last received packet type was */ |
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145 |
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146 int signal_pipe[2]; /* stores endpoints of a self-pipe used for |
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147 race-free signal handling */ |
|
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148 |
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149 time_t last_trx_packet_time; /* time of the last packet transmission, for |
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150 keepalive purposes */ |
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151 |
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152 time_t last_packet_time; /* time of the last packet transmission or receive, for |
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153 idle timeout purposes */ |
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154 |
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155 |
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156 /* KEX/encryption related */ |
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157 struct KEXState kexstate; |
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158 struct key_context *keys; |
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159 struct key_context *newkeys; |
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160 unsigned char *session_id; /* this is the hash from the first kex */ |
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161 /* The below are used temorarily during kex, are freed after use */ |
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162 mp_int * dh_K; /* SSH_MSG_KEXDH_REPLY and sending SSH_MSH_NEWKEYS */ |
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163 unsigned char hash[SHA1_HASH_SIZE]; /* the hash*/ |
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164 buffer* kexhashbuf; /* session hash buffer calculated from various packets*/ |
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165 buffer* transkexinit; /* the kexinit packet we send should be kept so we |
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166 can add it to the hash when generating keys */ |
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167 |
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168 /* Enables/disables compression */ |
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169 algo_type *compress_algos; |
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170 |
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171 /* a list of queued replies that should be sent after a KEX has |
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172 concluded (ie, while dataallowed was unset)*/ |
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173 struct packetlist *reply_queue_head, *reply_queue_tail; |
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174 |
| 33 | 175 void(*remoteclosed)(); /* A callback to handle closure of the |
| 176 remote connection */ | |
| 177 | |
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178 void(*extra_session_cleanup)(); /* client or server specific cleanup */ |
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179 void(*send_kex_first_guess)(); |
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180 |
| 33 | 181 struct AuthState authstate; /* Common amongst client and server, since most |
| 182 struct elements are common */ | |
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183 |
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184 /* Channel related */ |
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185 struct Channel ** channels; /* these pointers may be null */ |
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186 unsigned int chansize; /* the number of Channel*s allocated for channels */ |
| 37 | 187 unsigned int chancount; /* the number of Channel*s in use */ |
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188 const struct ChanType **chantypes; /* The valid channel types */ |
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189 |
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190 |
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191 /* TCP forwarding - where manage listeners */ |
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192 struct Listener ** listeners; |
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193 unsigned int listensize; |
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194 |
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195 /* Whether to allow binding to privileged ports (<1024). This doesn't |
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196 * really belong here, but nowhere else fits nicely */ |
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197 int allowprivport; |
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198 |
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199 }; |
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200 |
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201 struct serversession { |
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202 |
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203 /* Server specific options */ |
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204 int childpipe; /* kept open until we successfully authenticate */ |
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205 /* userauth */ |
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206 |
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207 struct ChildPid * childpids; /* array of mappings childpid<->channel */ |
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208 unsigned int childpidsize; |
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209 |
|
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210 /* Used to avoid a race in the exit returncode handling - see |
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211 * svr-chansession.c for details */ |
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212 struct exitinfo lastexit; |
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213 |
|
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214 /* The numeric address they connected from, used for logging */ |
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215 char * addrstring; |
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216 |
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217 /* The resolved remote address, used for lastlog etc */ |
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218 char *remotehost; |
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219 |
|
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220 #ifdef USE_VFORK |
|
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221 pid_t server_pid; |
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222 #endif |
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223 |
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224 }; |
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225 |
| 26 | 226 typedef enum { |
| 33 | 227 KEX_NOTHING, |
| 26 | 228 KEXINIT_RCVD, |
| 229 KEXDH_INIT_SENT, | |
|
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230 KEXDONE |
| 33 | 231 } cli_kex_state; |
| 232 | |
| 233 typedef enum { | |
| 234 STATE_NOTHING, | |
| 235 USERAUTH_REQ_SENT, | |
| 236 USERAUTH_FAIL_RCVD, | |
| 37 | 237 USERAUTH_SUCCESS_RCVD, |
|
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238 SESSION_RUNNING |
| 26 | 239 } cli_state; |
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240 |
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241 struct clientsession { |
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242 |
| 26 | 243 mp_int *dh_e, *dh_x; /* Used during KEX */ |
|
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244 int dh_val_algo; /* KEX algorithm corresponding to current dh_e and dh_x */ |
| 33 | 245 cli_kex_state kex_state; /* Used for progressing KEX */ |
| 246 cli_state state; /* Used to progress auth/channelsession etc */ | |
| 26 | 247 unsigned donefirstkex : 1; /* Set when we set sentnewkeys, never reset */ |
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248 |
|
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249 int tty_raw_mode; /* Whether we're in raw mode (and have to clean up) */ |
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250 struct termios saved_tio; |
|
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251 int stdincopy; |
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252 int stdinflags; |
|
175
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253 int stdoutcopy; |
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254 int stdoutflags; |
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255 int stderrcopy; |
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256 int stderrflags; |
|
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257 |
|
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258 /* for escape char handling */ |
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259 int last_char; |
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260 |
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261 int winchange; /* Set to 1 when a windowchange signal happens */ |
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262 |
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263 int lastauthtype; /* either AUTH_TYPE_PUBKEY or AUTH_TYPE_PASSWORD, |
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264 for the last type of auth we tried */ |
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265 #ifdef ENABLE_CLI_INTERACT_AUTH |
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266 int auth_interact_failed; /* flag whether interactive auth can still |
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267 be used */ |
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268 int interact_request_received; /* flag whether we've received an |
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269 info request from the server for |
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270 interactive auth.*/ |
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271 |
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272 int cipher_none_after_auth; /* Set to 1 if the user requested "none" |
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273 auth */ |
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274 #endif |
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275 sign_key *lastprivkey; |
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276 |
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277 int retval; /* What the command exit status was - we emulate it */ |
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278 #if 0 |
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279 TODO |
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280 struct AgentkeyList *agentkeys; /* Keys to use for public-key auth */ |
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281 #endif |
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282 |
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283 }; |
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284 |
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285 /* Global structs storing the state */ |
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286 extern struct sshsession ses; |
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287 |
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288 #ifdef DROPBEAR_SERVER |
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289 extern struct serversession svr_ses; |
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290 #endif /* DROPBEAR_SERVER */ |
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291 |
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292 #ifdef DROPBEAR_CLIENT |
| 26 | 293 extern struct clientsession cli_ses; |
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294 #endif /* DROPBEAR_CLIENT */ |
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295 |
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296 #endif /* _SESSION_H_ */ |