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annotate session.h @ 957:c4f138dae2fd

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Test for EAGAIN too
author Matt Johnston <matt@ucc.asn.au>
date Wed, 06 Aug 2014 21:55:43 +0800
parents 36eacc322e00
children f7f6c15b0ec3
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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 #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);
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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 void update_channel_prio();
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52
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53 const char* get_user_shell();
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54 void fill_passwd(const char* username);
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56 /* Server */
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57 void svr_session(int sock, int childpipe);
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58 void svr_dropbear_exit(int exitcode, const char* format, va_list param) ATTRIB_NORETURN;
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59 void svr_dropbear_log(int priority, const char* format, va_list param);
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60
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61 /* Client */
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62 void cli_session(int sock_in, int sock_out);
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63 void cleantext(unsigned char* dirtytext);
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65 /* crypto parameters that are stored individually for transmit and receive */
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66 struct key_context_directional {
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67 const struct dropbear_cipher *algo_crypt;
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68 const struct dropbear_cipher_mode *crypt_mode;
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69 const struct dropbear_hash *algo_mac;
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70 int hash_index; /* lookup for libtomcrypt */
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71 int algo_comp; /* compression */
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72 #ifndef DISABLE_ZLIB
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73 z_streamp zstream;
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74 #endif
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75 /* actual keys */
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76 union {
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77 symmetric_CBC cbc;
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78 #ifdef DROPBEAR_ENABLE_CTR_MODE
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79 symmetric_CTR ctr;
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80 #endif
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81 } cipher_state;
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82 unsigned char mackey[MAX_MAC_LEN];
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83 int valid;
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84 };
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85
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86 struct key_context {
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87
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88 struct key_context_directional recv;
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89 struct key_context_directional trans;
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90
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91 const struct dropbear_kex *algo_kex;
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92 int algo_hostkey;
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93
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94 int allow_compress; /* whether compression has started (useful in
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95 [email protected] delayed compression case) */
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96 };
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97
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98 struct packetlist;
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99 struct packetlist {
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100 struct packetlist *next;
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101 buffer * payload;
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102 };
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103
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104 struct sshsession {
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105
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106 /* Is it a client or server? */
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107 unsigned char isserver;
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108
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109 int sock_in;
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110 int sock_out;
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111
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112 /* remotehost will be initially NULL as we delay
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113 * reading the remote version string. it will be set
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114 * by the time any recv_() packet methods are called */
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115 unsigned char *remoteident;
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117 int maxfd; /* the maximum file descriptor to check with select() */
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118
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119
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120 /* Packet buffers/values etc */
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121 buffer *writepayload; /* Unencrypted payload to write - this is used
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122 throughout the code, as handlers fill out this
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123 buffer with the packet to send. */
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124 struct Queue writequeue; /* A queue of encrypted packets to send */
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125 buffer *readbuf; /* From the wire, decrypted in-place */
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126 buffer *payload; /* Post-decompression, the actual SSH packet */
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127 unsigned int transseq, recvseq; /* Sequence IDs */
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128
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129 /* Packet-handling flags */
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130 const packettype * packettypes; /* Packet handler mappings for this
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131 session, see process-packet.c */
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132
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133 unsigned dataallowed : 1; /* whether we can send data packets or we are in
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134 the middle of a KEX or something */
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135
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136 unsigned char requirenext; /* byte indicating what packets we require next,
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137 or 0x00 for any. */
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139 unsigned char ignorenext; /* whether to ignore the next packet,
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140 used for kex_follows stuff */
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141
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142 unsigned char lastpacket; /* What the last received packet type was */
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143
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144 int signal_pipe[2]; /* stores endpoints of a self-pipe used for
416
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145 race-free signal handling */
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146
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147 /* time of the last packet send/receive, for keepalive. Not real-world clock */
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148 time_t last_packet_time_keepalive_sent;
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149 time_t last_packet_time_keepalive_recv;
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150 time_t last_packet_time_any_sent;
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151
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152 time_t last_packet_time_idle; /* time of the last packet transmission or receive, for
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153 idle timeout purposes so ignores SSH_MSG_IGNORE
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154 or responses to keepalives. Not real-world clock */
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155
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156
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157 /* KEX/encryption related */
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158 struct KEXState kexstate;
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159 struct key_context *keys;
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160 struct key_context *newkeys;
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161 buffer *session_id; /* this is the hash from the first kex */
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162 /* The below are used temporarily during kex, are freed after use */
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163 mp_int * dh_K; /* SSH_MSG_KEXDH_REPLY and sending SSH_MSH_NEWKEYS */
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164 buffer *hash; /* the session hash */
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165 buffer* kexhashbuf; /* session hash buffer calculated from various packets*/
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166 buffer* transkexinit; /* the kexinit packet we send should be kept so we
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167 can add it to the hash when generating keys */
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168
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169 /* Enables/disables compression */
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170 algo_type *compress_algos;
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171
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172 /* a list of queued replies that should be sent after a KEX has
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173 concluded (ie, while dataallowed was unset)*/
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174 struct packetlist *reply_queue_head, *reply_queue_tail;
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175
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176 void(*remoteclosed)(); /* A callback to handle closure of the
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177 remote connection */
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178
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179 void(*extra_session_cleanup)(); /* client or server specific cleanup */
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180 void(*send_kex_first_guess)();
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181
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182 struct AuthState authstate; /* Common amongst client and server, since most
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183 struct elements are common */
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184
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185 /* Channel related */
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186 struct Channel ** channels; /* these pointers may be null */
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187 unsigned int chansize; /* the number of Channel*s allocated for channels */
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188 unsigned int chancount; /* the number of Channel*s in use */
6
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189 const struct ChanType **chantypes; /* The valid channel types */
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36eacc322e00 Make sure the check_close() handler runs when a server child process exits
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190 int channel_signal_pending; /* Flag set by sigchld handler */
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191
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192 /* TCP priority level for the main "port 22" tcp socket */
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193 enum dropbear_prio socket_prio;
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194
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195 /* TCP forwarding - where manage listeners */
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196 struct Listener ** listeners;
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197 unsigned int listensize;
156
8c2b3506f112 Rearrange preprocessor parts so that compilation with various options
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198
21
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199 /* Whether to allow binding to privileged ports (<1024). This doesn't
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200 * really belong here, but nowhere else fits nicely */
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201 int allowprivport;
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202
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203 };
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204
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205 struct serversession {
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206
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207 /* Server specific options */
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208 int childpipe; /* kept open until we successfully authenticate */
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209 /* userauth */
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210
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211 struct ChildPid * childpids; /* array of mappings childpid<->channel */
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212 unsigned int childpidsize;
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213
130
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214 /* Used to avoid a race in the exit returncode handling - see
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215 * svr-chansession.c for details */
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216 struct exitinfo lastexit;
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217
158
364a75cfebab Log the IP along with auth success/fail attempts
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218 /* The numeric address they connected from, used for logging */
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219 char * addrstring;
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220
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221 /* The resolved remote address, used for lastlog etc */
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222 char *remotehost;
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223
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224 time_t connect_time; /* time the connection was established
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225 (cleared after auth once we're not
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226 respecting AUTH_TIMEOUT any more).
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227 A monotonic time, not realworld */
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228
667
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229 #ifdef USE_VFORK
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230 pid_t server_pid;
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231 #endif
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232
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233 };
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234
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235 typedef enum {
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236 KEX_NOTHING,
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237 KEXINIT_RCVD,
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238 KEXDH_INIT_SENT,
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239 KEXDONE
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240 } cli_kex_state;
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241
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242 typedef enum {
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243 STATE_NOTHING,
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244 USERAUTH_WAIT,
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245 USERAUTH_REQ_SENT,
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246 USERAUTH_FAIL_RCVD,
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247 USERAUTH_SUCCESS_RCVD,
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248 SESSION_RUNNING
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249 } cli_state;
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250
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251 struct clientsession {
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252
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253 /* XXX - move these to kexstate? */
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254 struct kex_dh_param *dh_param;
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255 struct kex_ecdh_param *ecdh_param;
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256 struct kex_curve25519_param *curve25519_param;
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257 const struct dropbear_kex *param_kex_algo; /* KEX algorithm corresponding to current dh_e and dh_x */
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258
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259 cli_kex_state kex_state; /* Used for progressing KEX */
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260 cli_state state; /* Used to progress auth/channelsession etc */
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261 unsigned donefirstkex : 1; /* Set when we set sentnewkeys, never reset */
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262
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263 int tty_raw_mode; /* Whether we're in raw mode (and have to clean up) */
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264 struct termios saved_tio;
93
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265 int stdincopy;
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266 int stdinflags;
175
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267 int stdoutcopy;
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268 int stdoutflags;
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269 int stderrcopy;
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270 int stderrflags;
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271
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272 /* for escape char handling */
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273 int last_char;
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274
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275 int winchange; /* Set to 1 when a windowchange signal happens */
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276
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277 int lastauthtype; /* either AUTH_TYPE_PUBKEY or AUTH_TYPE_PASSWORD,
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278 for the last type of auth we tried */
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279 int ignore_next_auth_response;
249
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280 #ifdef ENABLE_CLI_INTERACT_AUTH
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281 int auth_interact_failed; /* flag whether interactive auth can still
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282 be used */
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283 int interact_request_received; /* flag whether we've received an
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284 info request from the server for
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285 interactive auth.*/
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286
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287 int cipher_none_after_auth; /* Set to 1 if the user requested "none"
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288 auth */
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289 #endif
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290 sign_key *lastprivkey;
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291
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292 int retval; /* What the command exit status was - we emulate it */
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293 #if 0
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294 TODO
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295 struct AgentkeyList *agentkeys; /* Keys to use for public-key auth */
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296 #endif
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297
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298 };
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299
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300 /* Global structs storing the state */
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301 extern struct sshsession ses;
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302
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303 #ifdef DROPBEAR_SERVER
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304 extern struct serversession svr_ses;
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305 #endif /* DROPBEAR_SERVER */
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306
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307 #ifdef DROPBEAR_CLIENT
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308 extern struct clientsession cli_ses;
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309 #endif /* DROPBEAR_CLIENT */
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310
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311 #endif /* _SESSION_H_ */