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annotate session.h @ 968:f7f6c15b0ec3

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Don't send SSH_MSG_UNIMPLEMENTED for keepalive responses
author Matt Johnston <matt@ucc.asn.au>
date Wed, 13 Aug 2014 21:48:47 +0800
parents 36eacc322e00
children 0bb16232e7c4
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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 void ignore_recv_msg_request_failure();
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51
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52 void update_channel_prio();
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53
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54 const char* get_user_shell();
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55 void fill_passwd(const char* username);
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56
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57 /* Server */
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58 void svr_session(int sock, int childpipe);
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59 void svr_dropbear_exit(int exitcode, const char* format, va_list param) ATTRIB_NORETURN;
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60 void svr_dropbear_log(int priority, const char* format, va_list param);
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61
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62 /* Client */
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63 void cli_session(int sock_in, int sock_out);
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64 void cleantext(unsigned char* dirtytext);
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65
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66 /* crypto parameters that are stored individually for transmit and receive */
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67 struct key_context_directional {
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68 const struct dropbear_cipher *algo_crypt;
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69 const struct dropbear_cipher_mode *crypt_mode;
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70 const struct dropbear_hash *algo_mac;
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71 int hash_index; /* lookup for libtomcrypt */
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72 int algo_comp; /* compression */
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73 #ifndef DISABLE_ZLIB
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74 z_streamp zstream;
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75 #endif
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76 /* actual keys */
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77 union {
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78 symmetric_CBC cbc;
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79 #ifdef DROPBEAR_ENABLE_CTR_MODE
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80 symmetric_CTR ctr;
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81 #endif
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82 } cipher_state;
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83 unsigned char mackey[MAX_MAC_LEN];
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84 int valid;
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85 };
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86
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87 struct key_context {
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88
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89 struct key_context_directional recv;
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90 struct key_context_directional trans;
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91
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92 const struct dropbear_kex *algo_kex;
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93 int algo_hostkey;
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94
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95 int allow_compress; /* whether compression has started (useful in
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96 [email protected] delayed compression case) */
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97 };
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98
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99 struct packetlist;
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100 struct packetlist {
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101 struct packetlist *next;
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102 buffer * payload;
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103 };
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104
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105 struct sshsession {
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106
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107 /* Is it a client or server? */
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108 unsigned char isserver;
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109
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110 int sock_in;
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111 int sock_out;
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112
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113 /* remotehost will be initially NULL as we delay
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114 * reading the remote version string. it will be set
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115 * by the time any recv_() packet methods are called */
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116 unsigned char *remoteident;
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117
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118 int maxfd; /* the maximum file descriptor to check with select() */
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119
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120
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121 /* Packet buffers/values etc */
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122 buffer *writepayload; /* Unencrypted payload to write - this is used
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123 throughout the code, as handlers fill out this
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124 buffer with the packet to send. */
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125 struct Queue writequeue; /* A queue of encrypted packets to send */
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126 buffer *readbuf; /* From the wire, decrypted in-place */
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127 buffer *payload; /* Post-decompression, the actual SSH packet */
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128 unsigned int transseq, recvseq; /* Sequence IDs */
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129
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130 /* Packet-handling flags */
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131 const packettype * packettypes; /* Packet handler mappings for this
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132 session, see process-packet.c */
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133
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134 unsigned dataallowed : 1; /* whether we can send data packets or we are in
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135 the middle of a KEX or something */
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136
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137 unsigned char requirenext; /* byte indicating what packets we require next,
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138 or 0x00 for any. */
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139
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140 unsigned char ignorenext; /* whether to ignore the next packet,
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141 used for kex_follows stuff */
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142
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143 unsigned char lastpacket; /* What the last received packet type was */
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144
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145 int signal_pipe[2]; /* stores endpoints of a self-pipe used for
416
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146 race-free signal handling */
454
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147
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148 /* time of the last packet send/receive, for keepalive. Not real-world clock */
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149 time_t last_packet_time_keepalive_sent;
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150 time_t last_packet_time_keepalive_recv;
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151 time_t last_packet_time_any_sent;
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152
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153 time_t last_packet_time_idle; /* time of the last packet transmission or receive, for
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154 idle timeout purposes so ignores SSH_MSG_IGNORE
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155 or responses to keepalives. Not real-world clock */
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156
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157
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158 /* KEX/encryption related */
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159 struct KEXState kexstate;
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160 struct key_context *keys;
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161 struct key_context *newkeys;
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162 buffer *session_id; /* this is the hash from the first kex */
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163 /* The below are used temporarily during kex, are freed after use */
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164 mp_int * dh_K; /* SSH_MSG_KEXDH_REPLY and sending SSH_MSH_NEWKEYS */
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165 buffer *hash; /* the session hash */
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166 buffer* kexhashbuf; /* session hash buffer calculated from various packets*/
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167 buffer* transkexinit; /* the kexinit packet we send should be kept so we
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168 can add it to the hash when generating keys */
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169
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170 /* Enables/disables compression */
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171 algo_type *compress_algos;
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172
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173 /* a list of queued replies that should be sent after a KEX has
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174 concluded (ie, while dataallowed was unset)*/
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175 struct packetlist *reply_queue_head, *reply_queue_tail;
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176
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177 void(*remoteclosed)(); /* A callback to handle closure of the
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178 remote connection */
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179
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180 void(*extra_session_cleanup)(); /* client or server specific cleanup */
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181 void(*send_kex_first_guess)();
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182
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183 struct AuthState authstate; /* Common amongst client and server, since most
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184 struct elements are common */
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185
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186 /* Channel related */
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187 struct Channel ** channels; /* these pointers may be null */
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188 unsigned int chansize; /* the number of Channel*s allocated for channels */
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189 unsigned int chancount; /* the number of Channel*s in use */
6
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190 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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191 int channel_signal_pending; /* Flag set by sigchld handler */
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192
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193 /* TCP priority level for the main "port 22" tcp socket */
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194 enum dropbear_prio socket_prio;
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195
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196 /* TCP forwarding - where manage listeners */
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197 struct Listener ** listeners;
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198 unsigned int listensize;
156
8c2b3506f112 Rearrange preprocessor parts so that compilation with various options
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199
21
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200 /* Whether to allow binding to privileged ports (<1024). This doesn't
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201 * really belong here, but nowhere else fits nicely */
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202 int allowprivport;
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203
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204 };
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205
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206 struct serversession {
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207
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208 /* Server specific options */
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209 int childpipe; /* kept open until we successfully authenticate */
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210 /* userauth */
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211
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212 struct ChildPid * childpids; /* array of mappings childpid<->channel */
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213 unsigned int childpidsize;
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214
130
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215 /* Used to avoid a race in the exit returncode handling - see
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216 * svr-chansession.c for details */
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217 struct exitinfo lastexit;
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218
158
364a75cfebab Log the IP along with auth success/fail attempts
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219 /* The numeric address they connected from, used for logging */
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220 char * addrstring;
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221
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222 /* The resolved remote address, used for lastlog etc */
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223 char *remotehost;
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224
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225 time_t connect_time; /* time the connection was established
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226 (cleared after auth once we're not
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227 respecting AUTH_TIMEOUT any more).
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228 A monotonic time, not realworld */
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229
667
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230 #ifdef USE_VFORK
553
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231 pid_t server_pid;
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232 #endif
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233
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234 };
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235
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236 typedef enum {
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237 KEX_NOTHING,
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238 KEXINIT_RCVD,
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239 KEXDH_INIT_SENT,
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240 KEXDONE
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241 } cli_kex_state;
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242
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243 typedef enum {
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244 STATE_NOTHING,
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245 USERAUTH_WAIT,
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246 USERAUTH_REQ_SENT,
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247 USERAUTH_FAIL_RCVD,
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248 USERAUTH_SUCCESS_RCVD,
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249 SESSION_RUNNING
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250 } cli_state;
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251
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252 struct clientsession {
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253
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254 /* XXX - move these to kexstate? */
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255 struct kex_dh_param *dh_param;
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256 struct kex_ecdh_param *ecdh_param;
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257 struct kex_curve25519_param *curve25519_param;
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258 const struct dropbear_kex *param_kex_algo; /* KEX algorithm corresponding to current dh_e and dh_x */
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259
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260 cli_kex_state kex_state; /* Used for progressing KEX */
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261 cli_state state; /* Used to progress auth/channelsession etc */
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262 unsigned donefirstkex : 1; /* Set when we set sentnewkeys, never reset */
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263
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264 int tty_raw_mode; /* Whether we're in raw mode (and have to clean up) */
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265 struct termios saved_tio;
93
5dda5a4d475c Don't leave the stdin FD non-blocking on exit - busybox doesn't like it.
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266 int stdincopy;
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267 int stdinflags;
175
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268 int stdoutcopy;
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269 int stdoutflags;
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270 int stderrcopy;
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271 int stderrflags;
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272
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273 /* for escape char handling */
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274 int last_char;
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275
41
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276 int winchange; /* Set to 1 when a windowchange signal happens */
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277
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278 int lastauthtype; /* either AUTH_TYPE_PUBKEY or AUTH_TYPE_PASSWORD,
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279 for the last type of auth we tried */
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280 int ignore_next_auth_response;
249
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281 #ifdef ENABLE_CLI_INTERACT_AUTH
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282 int auth_interact_failed; /* flag whether interactive auth can still
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283 be used */
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284 int interact_request_received; /* flag whether we've received an
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285 info request from the server for
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286 interactive auth.*/
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287
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288 int cipher_none_after_auth; /* Set to 1 if the user requested "none"
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289 auth */
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290 #endif
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291 sign_key *lastprivkey;
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292
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293 int retval; /* What the command exit status was - we emulate it */
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294 #if 0
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295 TODO
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296 struct AgentkeyList *agentkeys; /* Keys to use for public-key auth */
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297 #endif
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298
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299 };
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300
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301 /* Global structs storing the state */
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302 extern struct sshsession ses;
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303
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304 #ifdef DROPBEAR_SERVER
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305 extern struct serversession svr_ses;
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306 #endif /* DROPBEAR_SERVER */
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307
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308 #ifdef DROPBEAR_CLIENT
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309 extern struct clientsession cli_ses;
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310 #endif /* DROPBEAR_CLIENT */
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311
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312 #endif /* _SESSION_H_ */