Mercurial > dropbear
annotate session.h @ 1674:ba6fc7afe1c5
use sigtype where appropriate
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Mon, 06 Apr 2020 23:18:26 +0800 |
| parents | cc0fc5131c5c |
| children | ae41624c2198 |
| 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" |
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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" |
| 64 | 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" |
| 1654 | 41 #if DROPBEAR_PLUGIN |
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42 #include "pubkeyapi.h" |
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43 #endif |
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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)(void)) ATTRIB_NORETURN; |
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47 void session_cleanup(void); |
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48 void send_session_identification(void); |
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49 void send_msg_ignore(void); |
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50 void ignore_recv_response(void); |
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51 |
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52 void update_channel_prio(void); |
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53 |
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54 const char* get_user_shell(void); |
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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) ATTRIB_NORETURN; |
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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 |
| 26 | 62 /* Client */ |
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63 void cli_session(int sock_in, int sock_out, struct dropbear_progress_connection *progress, pid_t proxy_cmd_pid) ATTRIB_NORETURN; |
| 1025 | 64 void cli_connected(int result, int sock, void* userdata, const char *errstring); |
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65 void cleantext(char* dirtytext); |
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66 void kill_proxy_command(void); |
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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; | |
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81 #if DROPBEAR_ENABLE_CTR_MODE |
| 502 | 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; /* server key type */ |
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96 int algo_signature; /* server signature type */ |
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97 |
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98 int allow_compress; /* whether compression has started (useful in |
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99 [email protected] delayed compression case) */ |
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100 }; |
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101 |
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102 struct packetlist; |
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103 struct packetlist { |
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104 struct packetlist *next; |
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105 buffer * payload; |
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106 }; |
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107 |
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108 struct sshsession { |
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109 |
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110 /* Is it a client or server? */ |
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111 unsigned char isserver; |
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112 |
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113 time_t connect_time; /* time the connection was established |
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114 (cleared after auth once we're not |
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115 respecting AUTH_TIMEOUT any more). |
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116 A monotonic time, not realworld */ |
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117 |
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118 int sock_in; |
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119 int sock_out; |
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120 |
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121 /* remotehost will be initially NULL as we delay |
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122 * reading the remote version string. it will be set |
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123 * by the time any recv_() packet methods are called */ |
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124 char *remoteident; |
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125 |
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126 int maxfd; /* the maximum file descriptor to check with select() */ |
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127 |
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128 |
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129 /* Packet buffers/values etc */ |
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130 buffer *writepayload; /* Unencrypted payload to write - this is used |
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131 throughout the code, as handlers fill out this |
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132 buffer with the packet to send. */ |
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133 struct Queue writequeue; /* A queue of encrypted packets to send */ |
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134 unsigned int writequeue_len; /* Number of bytes pending to send in writequeue */ |
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135 buffer *readbuf; /* From the wire, decrypted in-place */ |
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136 buffer *payload; /* Post-decompression, the actual SSH packet. |
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137 May have extra data at the beginning, will be |
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138 passed to packet processing functions positioned past |
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139 that, see payload_beginning */ |
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140 unsigned int payload_beginning; |
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141 unsigned int transseq, recvseq; /* Sequence IDs */ |
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142 |
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143 /* Packet-handling flags */ |
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144 const packettype * packettypes; /* Packet handler mappings for this |
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145 session, see process-packet.c */ |
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146 |
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147 unsigned dataallowed : 1; /* whether we can send data packets or we are in |
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148 the middle of a KEX or something */ |
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149 |
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150 unsigned char requirenext; /* byte indicating what packets we require next, |
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151 or 0x00 for any. */ |
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152 |
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153 unsigned char ignorenext; /* whether to ignore the next packet, |
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154 used for kex_follows stuff */ |
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155 |
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156 unsigned char lastpacket; /* What the last received packet type was */ |
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157 |
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158 int signal_pipe[2]; /* stores endpoints of a self-pipe used for |
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159 race-free signal handling */ |
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160 int channel_signal_pending; /* Flag set when the signal pipe is triggered */ |
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161 |
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162 m_list conn_pending; |
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163 |
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164 /* time of the last packet send/receive, for keepalive. Not real-world clock */ |
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165 time_t last_packet_time_keepalive_sent; |
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166 time_t last_packet_time_keepalive_recv; |
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167 time_t last_packet_time_any_sent; |
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168 |
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169 time_t last_packet_time_idle; /* time of the last packet transmission or receive, for |
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170 idle timeout purposes so ignores SSH_MSG_IGNORE |
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171 or responses to keepalives. Not real-world clock */ |
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172 |
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173 |
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174 /* KEX/encryption related */ |
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175 struct KEXState kexstate; |
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176 struct key_context *keys; |
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177 struct key_context *newkeys; |
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178 buffer *session_id; /* this is the hash from the first kex */ |
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179 /* The below are used temporarily during kex, are freed after use */ |
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180 mp_int * dh_K; /* SSH_MSG_KEXDH_REPLY and sending SSH_MSH_NEWKEYS */ |
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181 buffer *hash; /* the session hash */ |
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182 buffer* kexhashbuf; /* session hash buffer calculated from various packets*/ |
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183 buffer* transkexinit; /* the kexinit packet we send should be kept so we |
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184 can add it to the hash when generating keys */ |
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185 |
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186 /* Enables/disables compression */ |
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187 algo_type *compress_algos; |
|
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188 |
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189 /* a list of queued replies that should be sent after a KEX has |
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190 concluded (ie, while dataallowed was unset)*/ |
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191 struct packetlist *reply_queue_head, *reply_queue_tail; |
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192 |
|
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193 void(*remoteclosed)(void); /* A callback to handle closure of the |
| 33 | 194 remote connection */ |
| 195 | |
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196 void(*extra_session_cleanup)(void); /* client or server specific cleanup */ |
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197 void(*send_kex_first_guess)(void); |
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198 |
| 33 | 199 struct AuthState authstate; /* Common amongst client and server, since most |
| 200 struct elements are common */ | |
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201 |
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202 /* Channel related */ |
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203 struct Channel ** channels; /* these pointers may be null */ |
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204 unsigned int chansize; /* the number of Channel*s allocated for channels */ |
| 37 | 205 unsigned int chancount; /* the number of Channel*s in use */ |
|
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206 const struct ChanType **chantypes; /* The valid channel types */ |
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207 |
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208 /* TCP priority level for the main "port 22" tcp socket */ |
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209 enum dropbear_prio socket_prio; |
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210 |
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211 /* TCP forwarding - where manage listeners */ |
|
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212 struct Listener ** listeners; |
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213 unsigned int listensize; |
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214 |
|
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215 /* Whether to allow binding to privileged ports (<1024). This doesn't |
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216 * really belong here, but nowhere else fits nicely */ |
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217 int allowprivport; |
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218 |
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219 /* this is set when we get SIGINT or SIGTERM, the handler is in main.c */ |
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220 volatile int exitflag; |
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221 /* set once the ses structure (and cli_ses/svr_ses) have been populated to their initial state */ |
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222 int init_done; |
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223 |
| 1654 | 224 #if DROPBEAR_PLUGIN |
| 225 struct PluginSession * plugin_session; | |
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226 #endif |
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227 }; |
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228 |
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229 struct serversession { |
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230 |
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231 /* Server specific options */ |
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232 int childpipe; /* kept open until we successfully authenticate */ |
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233 /* userauth */ |
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234 |
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235 struct ChildPid * childpids; /* array of mappings childpid<->channel */ |
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236 unsigned int childpidsize; |
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237 |
|
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238 /* Used to avoid a race in the exit returncode handling - see |
|
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239 * svr-chansession.c for details */ |
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240 struct exitinfo lastexit; |
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241 |
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242 /* The numeric address they connected from, used for logging */ |
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243 char * addrstring; |
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244 |
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245 /* The resolved remote address, used for lastlog etc */ |
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246 char *remotehost; |
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247 |
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248 #if DROPBEAR_VFORK |
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249 pid_t server_pid; |
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250 #endif |
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251 |
| 1654 | 252 #if DROPBEAR_PLUGIN |
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253 /* The shared library handle */ |
| 1654 | 254 void *plugin_handle; |
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255 |
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256 /* The instance created by the plugin_new function */ |
| 1654 | 257 struct PluginInstance *plugin_instance; |
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258 #endif |
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259 |
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260 }; |
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261 |
| 26 | 262 typedef enum { |
| 33 | 263 KEX_NOTHING, |
| 26 | 264 KEXINIT_RCVD, |
| 265 KEXDH_INIT_SENT, | |
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266 KEXDONE |
| 33 | 267 } cli_kex_state; |
| 268 | |
| 269 typedef enum { | |
| 270 STATE_NOTHING, | |
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271 USERAUTH_WAIT, |
| 33 | 272 USERAUTH_REQ_SENT, |
| 273 USERAUTH_FAIL_RCVD, | |
| 37 | 274 USERAUTH_SUCCESS_RCVD, |
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275 SESSION_RUNNING |
| 26 | 276 } cli_state; |
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277 |
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278 struct clientsession { |
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279 |
| 857 | 280 /* XXX - move these to kexstate? */ |
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281 struct kex_dh_param *dh_param; |
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282 struct kex_ecdh_param *ecdh_param; |
| 848 | 283 struct kex_curve25519_param *curve25519_param; |
| 801 | 284 const struct dropbear_kex *param_kex_algo; /* KEX algorithm corresponding to current dh_e and dh_x */ |
| 285 | |
| 33 | 286 cli_kex_state kex_state; /* Used for progressing KEX */ |
| 287 cli_state state; /* Used to progress auth/channelsession etc */ | |
| 26 | 288 unsigned donefirstkex : 1; /* Set when we set sentnewkeys, never reset */ |
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289 |
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290 int tty_raw_mode; /* Whether we're in raw mode (and have to clean up) */ |
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291 struct termios saved_tio; |
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292 int stdincopy; |
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293 int stdinflags; |
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294 int stdoutcopy; |
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295 int stdoutflags; |
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296 int stderrcopy; |
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297 int stderrflags; |
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298 |
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299 /* for escape char handling */ |
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300 int last_char; |
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301 |
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302 volatile int winchange; /* Set to 1 when a windowchange signal happens */ |
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303 |
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304 int lastauthtype; /* either AUTH_TYPE_PUBKEY or AUTH_TYPE_PASSWORD, |
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305 for the last type of auth we tried */ |
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306 int ignore_next_auth_response; |
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307 #if DROPBEAR_CLI_INTERACT_AUTH |
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308 int auth_interact_failed; /* flag whether interactive auth can still |
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309 be used */ |
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310 int interact_request_received; /* flag whether we've received an |
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311 info request from the server for |
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312 interactive auth.*/ |
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313 #endif |
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314 sign_key *lastprivkey; |
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108
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315 |
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316 int retval; /* What the command exit status was - we emulate it */ |
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317 #if 0 |
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318 TODO |
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319 struct AgentkeyList *agentkeys; /* Keys to use for public-key auth */ |
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320 #endif |
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321 |
| 1215 | 322 pid_t proxy_cmd_pid; |
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323 }; |
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324 |
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325 /* Global structs storing the state */ |
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326 extern struct sshsession ses; |
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327 |
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328 #if DROPBEAR_SERVER |
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329 extern struct serversession svr_ses; |
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330 #endif /* DROPBEAR_SERVER */ |
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331 |
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332 #if DROPBEAR_CLIENT |
| 26 | 333 extern struct clientsession cli_ses; |
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334 #endif /* DROPBEAR_CLIENT */ |
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335 |
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336 #endif /* DROPBEAR_SESSION_H_ */ |