Mercurial > dropbear
annotate session.h @ 1060:4c733310c21d nocircbuffer
reword comment for clarity
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Sun, 01 Mar 2015 23:26:42 +0800 |
| parents | 703c7cdd2577 |
| children | 2fa71c3b2827 10f198d4a308 |
| 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 DROPBEAR_SESSION_H_ |
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26 #define DROPBEAR_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 #include "netio.h" |
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42 |
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43 extern int sessinitdone; /* Is set to 0 somewhere */ |
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44 extern int exitflag; |
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45 |
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46 void common_session_init(int sock_in, int sock_out); |
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47 void session_loop(void(*loophandler)()) ATTRIB_NORETURN; |
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48 void session_cleanup(); |
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49 void send_session_identification(); |
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50 void send_msg_ignore(); |
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51 void ignore_recv_response(); |
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52 |
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53 void update_channel_prio(); |
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54 |
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55 const char* get_user_shell(); |
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56 void fill_passwd(const char* username); |
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57 |
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58 /* Server */ |
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59 void svr_session(int sock, int childpipe) ATTRIB_NORETURN; |
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60 void svr_dropbear_exit(int exitcode, const char* format, va_list param) ATTRIB_NORETURN; |
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61 void svr_dropbear_log(int priority, const char* format, va_list param); |
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62 |
| 26 | 63 /* Client */ |
| 1049 | 64 void cli_session(int sock_in, int sock_out, struct dropbear_progress_connection *progress) ATTRIB_NORETURN; |
| 1025 | 65 void cli_connected(int result, int sock, void* userdata, const char *errstring); |
| 43 | 66 void cleantext(unsigned char* dirtytext); |
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67 |
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68 /* crypto parameters that are stored individually for transmit and receive */ |
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69 struct key_context_directional { |
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70 const struct dropbear_cipher *algo_crypt; |
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71 const struct dropbear_cipher_mode *crypt_mode; |
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72 const struct dropbear_hash *algo_mac; |
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73 int hash_index; /* lookup for libtomcrypt */ |
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74 int algo_comp; /* compression */ |
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75 #ifndef DISABLE_ZLIB |
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76 z_streamp zstream; |
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77 #endif |
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78 /* actual keys */ |
| 502 | 79 union { |
| 80 symmetric_CBC cbc; | |
| 81 #ifdef DROPBEAR_ENABLE_CTR_MODE | |
| 82 symmetric_CTR ctr; | |
| 83 #endif | |
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84 } cipher_state; |
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85 unsigned char mackey[MAX_MAC_LEN]; |
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86 int valid; |
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87 }; |
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88 |
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89 struct key_context { |
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90 |
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91 struct key_context_directional recv; |
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92 struct key_context_directional trans; |
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93 |
| 756 | 94 const struct dropbear_kex *algo_kex; |
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95 int algo_hostkey; |
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96 |
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97 int allow_compress; /* whether compression has started (useful in |
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98 [email protected] delayed compression case) */ |
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99 }; |
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100 |
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101 struct packetlist; |
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102 struct packetlist { |
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103 struct packetlist *next; |
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104 buffer * payload; |
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105 }; |
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106 |
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107 struct sshsession { |
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108 |
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109 /* Is it a client or server? */ |
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110 unsigned char isserver; |
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111 |
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112 int sock_in; |
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113 int sock_out; |
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114 |
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115 /* remotehost will be initially NULL as we delay |
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116 * reading the remote version string. it will be set |
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117 * by the time any recv_() packet methods are called */ |
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118 unsigned char *remoteident; |
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119 |
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120 int maxfd; /* the maximum file descriptor to check with select() */ |
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121 |
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122 |
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123 /* Packet buffers/values etc */ |
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124 buffer *writepayload; /* Unencrypted payload to write - this is used |
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125 throughout the code, as handlers fill out this |
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126 buffer with the packet to send. */ |
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127 struct Queue writequeue; /* A queue of encrypted packets to send */ |
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128 buffer *readbuf; /* From the wire, decrypted in-place */ |
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129 buffer *payload; /* Post-decompression, the actual SSH packet. |
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130 May have extra data at the beginning, will be |
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131 passed to packet processing functions positioned past |
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132 that, see payload_beginning */ |
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133 unsigned int payload_beginning; |
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134 unsigned int transseq, recvseq; /* Sequence IDs */ |
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135 |
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136 /* Packet-handling flags */ |
|
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137 const packettype * packettypes; /* Packet handler mappings for this |
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138 session, see process-packet.c */ |
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139 |
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140 unsigned dataallowed : 1; /* whether we can send data packets or we are in |
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141 the middle of a KEX or something */ |
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142 |
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143 unsigned char requirenext; /* byte indicating what packets we require next, |
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144 or 0x00 for any. */ |
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145 |
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146 unsigned char ignorenext; /* whether to ignore the next packet, |
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147 used for kex_follows stuff */ |
|
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148 |
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149 unsigned char lastpacket; /* What the last received packet type was */ |
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150 |
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151 int signal_pipe[2]; /* stores endpoints of a self-pipe used for |
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152 race-free signal handling */ |
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153 |
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154 m_list conn_pending; |
|
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155 |
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156 /* time of the last packet send/receive, for keepalive. Not real-world clock */ |
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157 time_t last_packet_time_keepalive_sent; |
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158 time_t last_packet_time_keepalive_recv; |
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159 time_t last_packet_time_any_sent; |
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160 |
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161 time_t last_packet_time_idle; /* time of the last packet transmission or receive, for |
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162 idle timeout purposes so ignores SSH_MSG_IGNORE |
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163 or responses to keepalives. Not real-world clock */ |
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164 |
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165 |
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166 /* KEX/encryption related */ |
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167 struct KEXState kexstate; |
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168 struct key_context *keys; |
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169 struct key_context *newkeys; |
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170 buffer *session_id; /* this is the hash from the first kex */ |
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171 /* The below are used temporarily during kex, are freed after use */ |
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172 mp_int * dh_K; /* SSH_MSG_KEXDH_REPLY and sending SSH_MSH_NEWKEYS */ |
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173 buffer *hash; /* the session hash */ |
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174 buffer* kexhashbuf; /* session hash buffer calculated from various packets*/ |
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175 buffer* transkexinit; /* the kexinit packet we send should be kept so we |
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176 can add it to the hash when generating keys */ |
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177 |
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178 /* Enables/disables compression */ |
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179 algo_type *compress_algos; |
|
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180 |
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181 /* a list of queued replies that should be sent after a KEX has |
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182 concluded (ie, while dataallowed was unset)*/ |
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183 struct packetlist *reply_queue_head, *reply_queue_tail; |
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184 |
| 33 | 185 void(*remoteclosed)(); /* A callback to handle closure of the |
| 186 remote connection */ | |
| 187 | |
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188 void(*extra_session_cleanup)(); /* client or server specific cleanup */ |
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189 void(*send_kex_first_guess)(); |
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190 |
| 33 | 191 struct AuthState authstate; /* Common amongst client and server, since most |
| 192 struct elements are common */ | |
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193 |
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194 /* Channel related */ |
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195 struct Channel ** channels; /* these pointers may be null */ |
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196 unsigned int chansize; /* the number of Channel*s allocated for channels */ |
| 37 | 197 unsigned int chancount; /* the number of Channel*s in use */ |
|
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198 const struct ChanType **chantypes; /* The valid channel types */ |
|
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199 int channel_signal_pending; /* Flag set by sigchld handler */ |
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200 |
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201 /* TCP priority level for the main "port 22" tcp socket */ |
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202 enum dropbear_prio socket_prio; |
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203 |
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204 /* TCP forwarding - where manage listeners */ |
|
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205 struct Listener ** listeners; |
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206 unsigned int listensize; |
|
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207 |
|
21
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208 /* Whether to allow binding to privileged ports (<1024). This doesn't |
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209 * really belong here, but nowhere else fits nicely */ |
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210 int allowprivport; |
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211 |
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212 }; |
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213 |
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214 struct serversession { |
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215 |
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216 /* Server specific options */ |
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217 int childpipe; /* kept open until we successfully authenticate */ |
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218 /* userauth */ |
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219 |
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220 struct ChildPid * childpids; /* array of mappings childpid<->channel */ |
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221 unsigned int childpidsize; |
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222 |
|
130
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223 /* Used to avoid a race in the exit returncode handling - see |
|
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224 * svr-chansession.c for details */ |
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225 struct exitinfo lastexit; |
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226 |
|
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227 /* The numeric address they connected from, used for logging */ |
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228 char * addrstring; |
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229 |
|
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230 /* The resolved remote address, used for lastlog etc */ |
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231 char *remotehost; |
|
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232 |
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233 time_t connect_time; /* time the connection was established |
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234 (cleared after auth once we're not |
|
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235 respecting AUTH_TIMEOUT any more). |
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236 A monotonic time, not realworld */ |
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237 |
|
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238 #ifdef USE_VFORK |
|
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239 pid_t server_pid; |
|
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240 #endif |
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241 |
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242 }; |
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243 |
| 26 | 244 typedef enum { |
| 33 | 245 KEX_NOTHING, |
| 26 | 246 KEXINIT_RCVD, |
| 247 KEXDH_INIT_SENT, | |
|
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248 KEXDONE |
| 33 | 249 } cli_kex_state; |
| 250 | |
| 251 typedef enum { | |
| 252 STATE_NOTHING, | |
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253 USERAUTH_WAIT, |
| 33 | 254 USERAUTH_REQ_SENT, |
| 255 USERAUTH_FAIL_RCVD, | |
| 37 | 256 USERAUTH_SUCCESS_RCVD, |
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257 SESSION_RUNNING |
| 26 | 258 } cli_state; |
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259 |
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260 struct clientsession { |
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261 |
| 857 | 262 /* XXX - move these to kexstate? */ |
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263 struct kex_dh_param *dh_param; |
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264 struct kex_ecdh_param *ecdh_param; |
| 848 | 265 struct kex_curve25519_param *curve25519_param; |
| 801 | 266 const struct dropbear_kex *param_kex_algo; /* KEX algorithm corresponding to current dh_e and dh_x */ |
| 267 | |
| 33 | 268 cli_kex_state kex_state; /* Used for progressing KEX */ |
| 269 cli_state state; /* Used to progress auth/channelsession etc */ | |
| 26 | 270 unsigned donefirstkex : 1; /* Set when we set sentnewkeys, never reset */ |
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271 |
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272 int tty_raw_mode; /* Whether we're in raw mode (and have to clean up) */ |
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273 struct termios saved_tio; |
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274 int stdincopy; |
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275 int stdinflags; |
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276 int stdoutcopy; |
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277 int stdoutflags; |
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278 int stderrcopy; |
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279 int stderrflags; |
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280 |
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281 /* for escape char handling */ |
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282 int last_char; |
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283 |
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284 int winchange; /* Set to 1 when a windowchange signal happens */ |
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285 |
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286 int lastauthtype; /* either AUTH_TYPE_PUBKEY or AUTH_TYPE_PASSWORD, |
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287 for the last type of auth we tried */ |
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288 int ignore_next_auth_response; |
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289 #ifdef ENABLE_CLI_INTERACT_AUTH |
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290 int auth_interact_failed; /* flag whether interactive auth can still |
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291 be used */ |
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292 int interact_request_received; /* flag whether we've received an |
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293 info request from the server for |
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294 interactive auth.*/ |
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295 |
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296 int cipher_none_after_auth; /* Set to 1 if the user requested "none" |
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297 auth */ |
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298 #endif |
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299 sign_key *lastprivkey; |
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108
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300 |
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301 int retval; /* What the command exit status was - we emulate it */ |
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302 #if 0 |
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303 TODO |
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304 struct AgentkeyList *agentkeys; /* Keys to use for public-key auth */ |
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305 #endif |
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306 |
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307 }; |
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308 |
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309 /* Global structs storing the state */ |
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310 extern struct sshsession ses; |
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311 |
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312 #ifdef DROPBEAR_SERVER |
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313 extern struct serversession svr_ses; |
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314 #endif /* DROPBEAR_SERVER */ |
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315 |
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316 #ifdef DROPBEAR_CLIENT |
| 26 | 317 extern struct clientsession cli_ses; |
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318 #endif /* DROPBEAR_CLIENT */ |
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319 |
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320 #endif /* DROPBEAR_SESSION_H_ */ |