Mercurial > dropbear

annotate session.h @ 1734:73646de50f13 DROPBEAR_2020.80

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version 2020.80
author Matt Johnston <matt@ucc.asn.au>
date Fri, 26 Jun 2020 21:45:59 +0800
parents 41bf8f216644
children d1b279aa5ed1
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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"
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29 #include "buffer.h"
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30 #include "signkey.h"
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31 #include "kex.h"
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32 #include "auth.h"
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33 #include "channel.h"
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34 #include "queue.h"
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35 #include "listener.h"
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36 #include "packet.h"
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37 #include "tcpfwd.h"
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38 #include "chansession.h"
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39 #include "dbutil.h"
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40 #include "netio.h"
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41 #if DROPBEAR_PLUGIN
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42 #include "pubkeyapi.h"
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43 #endif
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44 #include "gcm.h"
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45 #include "chachapoly.h"
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46
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47 void common_session_init(int sock_in, int sock_out);
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48 void session_loop(void(*loophandler)(void)) ATTRIB_NORETURN;
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49 void session_cleanup(void);
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50 void send_session_identification(void);
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51 void send_msg_ignore(void);
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52 void ignore_recv_response(void);
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54 void update_channel_prio(void);
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55
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56 const char* get_user_shell(void);
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57 void fill_passwd(const char* username);
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58
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59 /* Server */
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60 void svr_session(int sock, int childpipe) ATTRIB_NORETURN;
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61 void svr_dropbear_exit(int exitcode, const char* format, va_list param) ATTRIB_NORETURN;
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62 void svr_dropbear_log(int priority, const char* format, va_list param);
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63
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64 /* Client */
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65 void cli_session(int sock_in, int sock_out, struct dropbear_progress_connection *progress, pid_t proxy_cmd_pid) ATTRIB_NORETURN;
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66 void cli_connected(int result, int sock, void* userdata, const char *errstring);
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67 void cleantext(char* dirtytext);
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68 void kill_proxy_command(void);
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70 /* crypto parameters that are stored individually for transmit and receive */
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71 struct key_context_directional {
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72 const struct dropbear_cipher *algo_crypt;
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73 const struct dropbear_cipher_mode *crypt_mode;
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74 const struct dropbear_hash *algo_mac;
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75 int hash_index; /* lookup for libtomcrypt */
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76 int algo_comp; /* compression */
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77 #ifndef DISABLE_ZLIB
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78 z_streamp zstream;
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79 #endif
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80 /* actual keys */
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81 union {
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82 #if DROPBEAR_ENABLE_CBC_MODE
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83 symmetric_CBC cbc;
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84 #endif
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85 #if DROPBEAR_ENABLE_CTR_MODE
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86 symmetric_CTR ctr;
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87 #endif
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88 #if DROPBEAR_ENABLE_GCM_MODE
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89 dropbear_gcm_state gcm;
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90 #endif
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91 #if DROPBEAR_CHACHA20POLY1305
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92 dropbear_chachapoly_state chachapoly;
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93 #endif
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94 } cipher_state;
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95 unsigned char mackey[MAX_MAC_LEN];
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96 int valid;
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97 };
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98
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99 struct key_context {
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100
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101 struct key_context_directional recv;
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102 struct key_context_directional trans;
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103
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104 const struct dropbear_kex *algo_kex;
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105 enum signkey_type algo_hostkey; /* server key type */
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106 enum signature_type algo_signature; /* server signature type */
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107
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108 int allow_compress; /* whether compression has started (useful in
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109 [email protected] delayed compression case) */
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110 };
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111
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112 struct packetlist;
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113 struct packetlist {
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114 struct packetlist *next;
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115 buffer * payload;
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116 };
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117
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118 struct sshsession {
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119
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120 /* Is it a client or server? */
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121 unsigned char isserver;
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122
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123 time_t connect_time; /* time the connection was established
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124 (cleared after auth once we're not
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125 respecting AUTH_TIMEOUT any more).
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126 A monotonic time, not realworld */
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127
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128 int sock_in;
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129 int sock_out;
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130
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131 /* remotehost will be initially NULL as we delay
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132 * reading the remote version string. it will be set
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133 * by the time any recv_() packet methods are called */
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134 char *remoteident;
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135
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136 int maxfd; /* the maximum file descriptor to check with select() */
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137
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138
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139 /* Packet buffers/values etc */
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140 buffer *writepayload; /* Unencrypted payload to write - this is used
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141 throughout the code, as handlers fill out this
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142 buffer with the packet to send. */
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143 struct Queue writequeue; /* A queue of encrypted packets to send */
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144 unsigned int writequeue_len; /* Number of bytes pending to send in writequeue */
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145 buffer *readbuf; /* From the wire, decrypted in-place */
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146 buffer *payload; /* Post-decompression, the actual SSH packet.
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147 May have extra data at the beginning, will be
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148 passed to packet processing functions positioned past
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149 that, see payload_beginning */
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150 unsigned int payload_beginning;
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151 unsigned int transseq, recvseq; /* Sequence IDs */
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152
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153 /* Packet-handling flags */
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154 const packettype * packettypes; /* Packet handler mappings for this
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155 session, see process-packet.c */
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156
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157 unsigned dataallowed : 1; /* whether we can send data packets or we are in
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158 the middle of a KEX or something */
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159
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160 unsigned char requirenext; /* byte indicating what packets we require next,
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161 or 0x00 for any. */
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162
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163 unsigned char ignorenext; /* whether to ignore the next packet,
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164 used for kex_follows stuff */
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165
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166 unsigned char lastpacket; /* What the last received packet type was */
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167
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168 int signal_pipe[2]; /* stores endpoints of a self-pipe used for
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169 race-free signal handling */
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170 int channel_signal_pending; /* Flag set when the signal pipe is triggered */
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171
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172 m_list conn_pending;
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173
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174 /* time of the last packet send/receive, for keepalive. Not real-world clock */
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175 time_t last_packet_time_keepalive_sent;
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176 time_t last_packet_time_keepalive_recv;
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177 time_t last_packet_time_any_sent;
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178
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179 time_t last_packet_time_idle; /* time of the last packet transmission or receive, for
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180 idle timeout purposes so ignores SSH_MSG_IGNORE
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181 or responses to keepalives. Not real-world clock */
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182
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183
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184 /* KEX/encryption related */
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185 struct KEXState kexstate;
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186 struct key_context *keys;
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187 struct key_context *newkeys;
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188 buffer *session_id; /* this is the hash from the first kex */
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189 /* The below are used temporarily during kex, are freed after use */
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190 mp_int * dh_K; /* SSH_MSG_KEXDH_REPLY and sending SSH_MSH_NEWKEYS */
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191 buffer *hash; /* the session hash */
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192 buffer* kexhashbuf; /* session hash buffer calculated from various packets*/
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193 buffer* transkexinit; /* the kexinit packet we send should be kept so we
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194 can add it to the hash when generating keys */
575
f9b5dc0cba61 - Disable compression for non-final multihops
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195
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196 /* Enables/disables compression */
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197 algo_type *compress_algos;
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198
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199 /* Other side allows SSH_MSG_EXT_INFO. Currently only set for server */
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200 int allow_ext_info;
452
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
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201
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202 /* a list of queued replies that should be sent after a KEX has
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203 concluded (ie, while dataallowed was unset)*/
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204 struct packetlist *reply_queue_head, *reply_queue_tail;
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205
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206 void(*remoteclosed)(void); /* A callback to handle closure of the
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207 remote connection */
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208
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209 void(*extra_session_cleanup)(void); /* client or server specific cleanup */
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210 void(*send_kex_first_guess)(void);
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211
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212 struct AuthState authstate; /* Common amongst client and server, since most
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213 struct elements are common */
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214
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215 /* Channel related */
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216 struct Channel ** channels; /* these pointers may be null */
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217 unsigned int chansize; /* the number of Channel*s allocated for channels */
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0913e2ee3545 we're nearly there yet
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218 unsigned int chancount; /* the number of Channel*s in use */
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ab00ef513e97 Sorted out the first channel init issues.
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219 const struct ChanType **chantypes; /* The valid channel types */
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220
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221 /* TCP priority level for the main "port 22" tcp socket */
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222 enum dropbear_prio socket_prio;
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223
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224 /* TCP forwarding - where manage listeners */
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225 struct Listener ** listeners;
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226 unsigned int listensize;
156
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227
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228 /* Whether to allow binding to privileged ports (<1024). This doesn't
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229 * really belong here, but nowhere else fits nicely */
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230 int allowprivport;
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231
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232 /* this is set when we get SIGINT or SIGTERM, the handler is in main.c */
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233 volatile int exitflag;
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234 /* set once the ses structure (and cli_ses/svr_ses) have been populated to their initial state */
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235 int init_done;
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236
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237 #if DROPBEAR_PLUGIN
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238 struct PluginSession * plugin_session;
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239 #endif
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240 };
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241
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242 struct serversession {
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243
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244 /* Server specific options */
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245 int childpipe; /* kept open until we successfully authenticate */
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246 /* userauth */
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247
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248 struct ChildPid * childpids; /* array of mappings childpid<->channel */
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249 unsigned int childpidsize;
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250
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251 /* Used to avoid a race in the exit returncode handling - see
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252 * svr-chansession.c for details */
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253 struct exitinfo lastexit;
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254
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255 /* The numeric address they connected from, used for logging */
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256 char * addrstring;
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257
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258 /* The resolved remote address, used for lastlog etc */
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259 char *remotehost;
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260
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261 #if DROPBEAR_VFORK
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262 pid_t server_pid;
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263 #endif
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264
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265 #if DROPBEAR_PLUGIN
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266 /* The shared library handle */
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267 void *plugin_handle;
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268
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269 /* The instance created by the plugin_new function */
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270 struct PluginInstance *plugin_instance;
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271 #endif
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272 };
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273
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274 typedef enum {
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275 KEX_NOTHING,
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276 KEXINIT_RCVD,
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277 KEXDH_INIT_SENT,
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278 KEXDONE
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279 } cli_kex_state;
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280
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281 typedef enum {
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282 STATE_NOTHING,
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283 USERAUTH_WAIT,
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284 USERAUTH_REQ_SENT,
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285 USERAUTH_FAIL_RCVD,
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286 USERAUTH_SUCCESS_RCVD,
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287 SESSION_RUNNING
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288 } cli_state;
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289
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290 struct clientsession {
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291
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292 /* XXX - move these to kexstate? */
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293 struct kex_dh_param *dh_param;
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294 struct kex_ecdh_param *ecdh_param;
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295 struct kex_curve25519_param *curve25519_param;
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296 const struct dropbear_kex *param_kex_algo; /* KEX algorithm corresponding to current dh_e and dh_x */
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297
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298 cli_kex_state kex_state; /* Used for progressing KEX */
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299 cli_state state; /* Used to progress auth/channelsession etc */
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300
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301 int tty_raw_mode; /* Whether we're in raw mode (and have to clean up) */
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302 struct termios saved_tio;
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303 int stdincopy;
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304 int stdinflags;
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305 int stdoutcopy;
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306 int stdoutflags;
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307 int stderrcopy;
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308 int stderrflags;
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309
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310 /* for escape char handling */
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311 int last_char;
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312
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313 volatile int winchange; /* Set to 1 when a windowchange signal happens */
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314
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315 int lastauthtype; /* either AUTH_TYPE_PUBKEY or AUTH_TYPE_PASSWORD,
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316 for the last type of auth we tried */
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317 int ignore_next_auth_response;
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318 #if DROPBEAR_CLI_INTERACT_AUTH
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319 int auth_interact_failed; /* flag whether interactive auth can still
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320 be used */
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321 int interact_request_received; /* flag whether we've received an
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322 info request from the server for
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323 interactive auth.*/
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324 #endif
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325 sign_key *lastprivkey;
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326
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327 buffer *server_sig_algs;
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328
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329 int retval; /* What the command exit status was - we emulate it */
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330 #if 0
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331 TODO
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332 struct AgentkeyList *agentkeys; /* Keys to use for public-key auth */
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333 #endif
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334
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335 pid_t proxy_cmd_pid;
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336 };
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337
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338 /* Global structs storing the state */
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339 extern struct sshsession ses;
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340
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341 #if DROPBEAR_SERVER
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342 extern struct serversession svr_ses;
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343 #endif /* DROPBEAR_SERVER */
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344
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345 #if DROPBEAR_CLIENT
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346 extern struct clientsession cli_ses;
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347 #endif /* DROPBEAR_CLIENT */
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348
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349 #endif /* DROPBEAR_SESSION_H_ */