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annotate session.h @ 482:7ad49f34a122

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- Add run_shell_command() function to run a "sh -c" command, handling lots of the work that exechild did (and can be shared by client -J option)
author Matt Johnston <matt@ucc.asn.au>
date Mon, 15 Sep 2008 14:04:55 +0000
parents e3db1f7a2e43
children 738313e73b1c
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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 #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);
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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
482
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50 const char* get_user_shell();
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51
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52 /* Server */
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53 void svr_session(int sock, int childpipe, char *remotehost, char *addrstring);
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54 void svr_dropbear_exit(int exitcode, const char* format, va_list param);
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55 void svr_dropbear_log(int priority, const char* format, va_list param);
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56
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57 /* Client */
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58 void cli_session(int sock_in, int sock_out, char *remotehost);
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59 void cli_session_cleanup();
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60 void cleantext(unsigned char* dirtytext);
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61
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62 struct key_context {
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63
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64 const struct dropbear_cipher *recv_algo_crypt; /* NULL for none */
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65 const struct dropbear_cipher *trans_algo_crypt; /* NULL for none */
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66 const struct dropbear_hash *recv_algo_mac; /* NULL for none */
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67 const struct dropbear_hash *trans_algo_mac; /* NULL for none */
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68 char algo_kex;
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69 char algo_hostkey;
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71 char recv_algo_comp; /* compression */
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72 char trans_algo_comp;
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73 #ifndef DISABLE_ZLIB
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74 z_streamp recv_zstream;
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75 z_streamp trans_zstream;
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76 #endif
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77
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78 /* actual keys */
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79 symmetric_CBC recv_symmetric_struct;
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80 symmetric_CBC trans_symmetric_struct;
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81 unsigned char recvmackey[MAX_MAC_KEY];
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82 unsigned char transmackey[MAX_MAC_KEY];
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83
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84 };
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85
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86 struct packetlist;
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87 struct packetlist {
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88 struct packetlist *next;
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89 buffer * payload;
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90 };
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91
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92 struct sshsession {
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93
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94 /* Is it a client or server? */
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95 unsigned char isserver;
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96
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97 time_t connect_time; /* time the connection was established
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98 (cleared after auth once we're not
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99 respecting AUTH_TIMEOUT any more) */
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100
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101 int sock_in;
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102 int sock_out;
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103
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104 unsigned char *remotehost; /* the peer hostname */
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105
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106 unsigned char *remoteident;
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107
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108 int maxfd; /* the maximum file descriptor to check with select() */
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110
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111 /* Packet buffers/values etc */
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112 buffer *writepayload; /* Unencrypted payload to write - this is used
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113 throughout the code, as handlers fill out this
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114 buffer with the packet to send. */
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115 struct Queue writequeue; /* A queue of encrypted packets to send */
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116 buffer *readbuf; /* Encrypted */
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117 buffer *decryptreadbuf; /* Post-decryption */
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118 buffer *payload; /* Post-decompression, the actual SSH packet */
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119 unsigned int transseq, recvseq; /* Sequence IDs */
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120
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121 /* Packet-handling flags */
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122 const packettype * packettypes; /* Packet handler mappings for this
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123 session, see process-packet.c */
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124
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125 unsigned dataallowed : 1; /* whether we can send data packets or we are in
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126 the middle of a KEX or something */
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127
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128 unsigned char requirenext; /* byte indicating what packet we require next,
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129 or 0x00 for any */
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130
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131 unsigned char ignorenext; /* whether to ignore the next packet,
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132 used for kex_follows stuff */
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133
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134 unsigned char lastpacket; /* What the last received packet type was */
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135
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136 int signal_pipe[2]; /* stores endpoints of a self-pipe used for
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137 race-free signal handling */
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138
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139 time_t last_packet_time; /* time of the last packet transmission, for
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140 keepalive purposes */
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141
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142 /* KEX/encryption related */
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143 struct KEXState kexstate;
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144 struct key_context *keys;
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145 struct key_context *newkeys;
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146 unsigned char *session_id; /* this is the hash from the first kex */
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147 /* The below are used temorarily during kex, are freed after use */
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148 mp_int * dh_K; /* SSH_MSG_KEXDH_REPLY and sending SSH_MSH_NEWKEYS */
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149 unsigned char hash[SHA1_HASH_SIZE]; /* the hash*/
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150 buffer* kexhashbuf; /* session hash buffer calculated from various packets*/
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151 buffer* transkexinit; /* the kexinit packet we send should be kept so we
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152 can add it to the hash when generating keys */
452
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153
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154 /* a list of queued replies that should be sent after a KEX has
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155 concluded (ie, while dataallowed was unset)*/
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156 struct packetlist *reply_queue_head, *reply_queue_tail;
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157
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158 algo_type*(*buf_match_algo)(buffer*buf, algo_type localalgos[],
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159 int *goodguess); /* The function to use to choose which algorithm
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160 to use from the ones presented by the remote
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161 side. Is specific to the client/server mode,
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162 hence the function-pointer callback.*/
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163
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164 void(*remoteclosed)(); /* A callback to handle closure of the
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165 remote connection */
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166
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167
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168 struct AuthState authstate; /* Common amongst client and server, since most
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169 struct elements are common */
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170
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171 /* Channel related */
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172 struct Channel ** channels; /* these pointers may be null */
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173 unsigned int chansize; /* the number of Channel*s allocated for channels */
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174 unsigned int chancount; /* the number of Channel*s in use */
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175 const struct ChanType **chantypes; /* The valid channel types */
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176
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177
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178 /* TCP forwarding - where manage listeners */
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179 struct Listener ** listeners;
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180 unsigned int listensize;
156
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181
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182 /* Whether to allow binding to privileged ports (<1024). This doesn't
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183 * really belong here, but nowhere else fits nicely */
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184 int allowprivport;
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185
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186 };
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187
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188 struct serversession {
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189
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190 /* Server specific options */
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191 int childpipe; /* kept open until we successfully authenticate */
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192 /* userauth */
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193
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194 struct ChildPid * childpids; /* array of mappings childpid<->channel */
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195 unsigned int childpidsize;
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196
130
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197 /* Used to avoid a race in the exit returncode handling - see
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198 * svr-chansession.c for details */
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199 struct exitinfo lastexit;
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200
158
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201 /* The numeric address they connected from, used for logging */
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202 char * addrstring;
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203
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204 };
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205
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206 typedef enum {
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207 KEX_NOTHING,
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208 KEXINIT_RCVD,
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209 KEXDH_INIT_SENT,
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210 KEXDONE
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211 } cli_kex_state;
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212
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213 typedef enum {
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214 STATE_NOTHING,
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215 SERVICE_AUTH_REQ_SENT,
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216 SERVICE_AUTH_ACCEPT_RCVD,
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217 SERVICE_CONN_REQ_SENT,
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218 SERVICE_CONN_ACCEPT_RCVD,
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219 USERAUTH_REQ_SENT,
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220 USERAUTH_FAIL_RCVD,
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221 USERAUTH_SUCCESS_RCVD,
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222 SESSION_RUNNING
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223 } cli_state;
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224
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225 struct clientsession {
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226
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227 mp_int *dh_e, *dh_x; /* Used during KEX */
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228 cli_kex_state kex_state; /* Used for progressing KEX */
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229 cli_state state; /* Used to progress auth/channelsession etc */
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230 unsigned donefirstkex : 1; /* Set when we set sentnewkeys, never reset */
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231
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232 int tty_raw_mode; /* Whether we're in raw mode (and have to clean up) */
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233 struct termios saved_tio;
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234 int stdincopy;
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235 int stdinflags;
175
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236 int stdoutcopy;
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237 int stdoutflags;
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238 int stderrcopy;
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239 int stderrflags;
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240
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241 int winchange; /* Set to 1 when a windowchange signal happens */
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242
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243 int lastauthtype; /* either AUTH_TYPE_PUBKEY or AUTH_TYPE_PASSWORD,
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244 for the last type of auth we tried */
249
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245 #ifdef ENABLE_CLI_INTERACT_AUTH
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246 int auth_interact_failed; /* flag whether interactive auth can still
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247 be used */
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248 int interact_request_received; /* flag whether we've received an
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249 info request from the server for
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250 interactive auth.*/
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251 #endif
215
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252 struct SignKeyList *lastprivkey;
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253
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254 int retval; /* What the command exit status was - we emulate it */
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255 #if 0
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256 TODO
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257 struct AgentkeyList *agentkeys; /* Keys to use for public-key auth */
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258 #endif
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259
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260 };
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261
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262 /* Global structs storing the state */
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263 extern struct sshsession ses;
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264
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265 #ifdef DROPBEAR_SERVER
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266 extern struct serversession svr_ses;
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267 #endif /* DROPBEAR_SERVER */
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268
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269 #ifdef DROPBEAR_CLIENT
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270 extern struct clientsession cli_ses;
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271 #endif /* DROPBEAR_CLIENT */
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272
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273 #endif /* _SESSION_H_ */