Mercurial > dropbear
annotate session.h @ 941:5daedffd0769
Set tcp priority as follows:
if (connecting || ptys || x11) tos = LOWDELAY;
else if (tcp_forwards) tos = 0;
else tos = BULK;
TCP forwards could be either lowdelay or bulk, hence the default priority.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 16 Jul 2014 22:53:32 +0800 |
parents | e9dfb6d15193 |
children | 36eacc322e00 |
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 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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55 |
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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 |
26 | 61 /* Client */ |
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62 void cli_session(int sock_in, int sock_out); |
43 | 63 void cleantext(unsigned char* dirtytext); |
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64 |
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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 */ |
502 | 76 union { |
77 symmetric_CBC cbc; | |
78 #ifdef DROPBEAR_ENABLE_CTR_MODE | |
79 symmetric_CTR ctr; | |
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 |
756 | 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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116 |
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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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138 |
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139 unsigned char ignorenext; /* whether to ignore the next packet, |
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140 used for kex_follows stuff */ |
34
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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 */ |
454
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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 */ |
575
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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 |
33 | 176 void(*remoteclosed)(); /* A callback to handle closure of the |
177 remote connection */ | |
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 |
33 | 182 struct AuthState authstate; /* Common amongst client and server, since most |
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 */ |
37 | 188 unsigned int chancount; /* the number of Channel*s in use */ |
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189 const struct ChanType **chantypes; /* The valid channel types */ |
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190 |
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191 /* TCP priority level for the main "port 22" tcp socket */ |
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192 enum dropbear_prio socket_prio; |
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193 |
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194 /* TCP forwarding - where manage listeners */ |
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195 struct Listener ** listeners; |
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196 unsigned int listensize; |
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197 |
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198 /* Whether to allow binding to privileged ports (<1024). This doesn't |
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199 * really belong here, but nowhere else fits nicely */ |
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200 int allowprivport; |
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201 |
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202 }; |
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203 |
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204 struct serversession { |
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205 |
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206 /* Server specific options */ |
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207 int childpipe; /* kept open until we successfully authenticate */ |
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208 /* userauth */ |
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209 |
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210 struct ChildPid * childpids; /* array of mappings childpid<->channel */ |
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211 unsigned int childpidsize; |
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212 |
130
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213 /* Used to avoid a race in the exit returncode handling - see |
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214 * svr-chansession.c for details */ |
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215 struct exitinfo lastexit; |
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216 |
158
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217 /* The numeric address they connected from, used for logging */ |
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218 char * addrstring; |
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219 |
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220 /* The resolved remote address, used for lastlog etc */ |
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221 char *remotehost; |
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222 |
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223 time_t connect_time; /* time the connection was established |
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224 (cleared after auth once we're not |
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225 respecting AUTH_TIMEOUT any more). |
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226 A monotonic time, not realworld */ |
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227 |
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228 #ifdef USE_VFORK |
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229 pid_t server_pid; |
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230 #endif |
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231 |
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232 }; |
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233 |
26 | 234 typedef enum { |
33 | 235 KEX_NOTHING, |
26 | 236 KEXINIT_RCVD, |
237 KEXDH_INIT_SENT, | |
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238 KEXDONE |
33 | 239 } cli_kex_state; |
240 | |
241 typedef enum { | |
242 STATE_NOTHING, | |
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243 USERAUTH_WAIT, |
33 | 244 USERAUTH_REQ_SENT, |
245 USERAUTH_FAIL_RCVD, | |
37 | 246 USERAUTH_SUCCESS_RCVD, |
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247 SESSION_RUNNING |
26 | 248 } cli_state; |
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249 |
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250 struct clientsession { |
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251 |
857 | 252 /* XXX - move these to kexstate? */ |
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253 struct kex_dh_param *dh_param; |
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254 struct kex_ecdh_param *ecdh_param; |
848 | 255 struct kex_curve25519_param *curve25519_param; |
801 | 256 const struct dropbear_kex *param_kex_algo; /* KEX algorithm corresponding to current dh_e and dh_x */ |
257 | |
33 | 258 cli_kex_state kex_state; /* Used for progressing KEX */ |
259 cli_state state; /* Used to progress auth/channelsession etc */ | |
26 | 260 unsigned donefirstkex : 1; /* Set when we set sentnewkeys, never reset */ |
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261 |
39
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262 int tty_raw_mode; /* Whether we're in raw mode (and have to clean up) */ |
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263 struct termios saved_tio; |
93
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264 int stdincopy; |
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265 int stdinflags; |
175
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266 int stdoutcopy; |
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267 int stdoutflags; |
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268 int stderrcopy; |
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269 int stderrflags; |
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270 |
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271 /* for escape char handling */ |
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272 int last_char; |
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273 |
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274 int winchange; /* Set to 1 when a windowchange signal happens */ |
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275 |
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276 int lastauthtype; /* either AUTH_TYPE_PUBKEY or AUTH_TYPE_PASSWORD, |
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277 for the last type of auth we tried */ |
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278 int ignore_next_auth_response; |
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279 #ifdef ENABLE_CLI_INTERACT_AUTH |
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280 int auth_interact_failed; /* flag whether interactive auth can still |
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281 be used */ |
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282 int interact_request_received; /* flag whether we've received an |
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283 info request from the server for |
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284 interactive auth.*/ |
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285 |
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286 int cipher_none_after_auth; /* Set to 1 if the user requested "none" |
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287 auth */ |
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288 #endif |
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289 sign_key *lastprivkey; |
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290 |
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291 int retval; /* What the command exit status was - we emulate it */ |
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292 #if 0 |
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293 TODO |
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294 struct AgentkeyList *agentkeys; /* Keys to use for public-key auth */ |
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295 #endif |
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296 |
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297 }; |
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298 |
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299 /* Global structs storing the state */ |
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300 extern struct sshsession ses; |
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301 |
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302 #ifdef DROPBEAR_SERVER |
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303 extern struct serversession svr_ses; |
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304 #endif /* DROPBEAR_SERVER */ |
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305 |
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306 #ifdef DROPBEAR_CLIENT |
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308 #endif /* DROPBEAR_CLIENT */ |
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309 |
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310 #endif /* _SESSION_H_ */ |