Mercurial > dropbear
annotate session.h @ 1156:a8f4dade70e5
avoid getpass when not used
some systems (like android's bionic) do not provide getpass. you can
disable ENABLE_CLI_PASSWORD_AUTH & ENABLE_CLI_INTERACT_AUTH to avoid
its use (and rely on pubkey auth), but the link still fails because
the support file calls getpass. do not define this func if both of
those auth methods are not used.
author | Mike Frysinger <vapier@gentoo.org> |
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date | Wed, 21 Oct 2015 22:39:55 +0800 |
parents | 80b45616e1f3 |
children | fb58cf341951 |
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); |
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66 void cleantext(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 time_t connect_time; /* time the connection was established |
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113 (cleared after auth once we're not |
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114 respecting AUTH_TIMEOUT any more). |
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115 A monotonic time, not realworld */ |
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116 |
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117 int sock_in; |
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118 int sock_out; |
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119 |
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120 /* remotehost will be initially NULL as we delay |
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121 * reading the remote version string. it will be set |
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122 * by the time any recv_() packet methods are called */ |
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123 char *remoteident; |
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124 |
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125 int maxfd; /* the maximum file descriptor to check with select() */ |
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126 |
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127 |
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128 /* Packet buffers/values etc */ |
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129 buffer *writepayload; /* Unencrypted payload to write - this is used |
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130 throughout the code, as handlers fill out this |
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131 buffer with the packet to send. */ |
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132 struct Queue writequeue; /* A queue of encrypted packets to send */ |
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133 unsigned int writequeue_len; /* Number of bytes pending to send in writequeue */ |
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134 buffer *readbuf; /* From the wire, decrypted in-place */ |
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135 buffer *payload; /* Post-decompression, the actual SSH packet. |
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136 May have extra data at the beginning, will be |
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137 passed to packet processing functions positioned past |
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138 that, see payload_beginning */ |
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139 unsigned int payload_beginning; |
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140 unsigned int transseq, recvseq; /* Sequence IDs */ |
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141 |
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142 /* Packet-handling flags */ |
22
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143 const packettype * packettypes; /* Packet handler mappings for this |
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144 session, see process-packet.c */ |
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145 |
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146 unsigned dataallowed : 1; /* whether we can send data packets or we are in |
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147 the middle of a KEX or something */ |
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148 |
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149 unsigned char requirenext; /* byte indicating what packets we require next, |
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150 or 0x00 for any. */ |
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151 |
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152 unsigned char ignorenext; /* whether to ignore the next packet, |
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153 used for kex_follows stuff */ |
34
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154 |
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155 unsigned char lastpacket; /* What the last received packet type was */ |
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156 |
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157 int signal_pipe[2]; /* stores endpoints of a self-pipe used for |
416
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158 race-free signal handling */ |
1024
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159 |
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160 m_list conn_pending; |
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161 |
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162 /* time of the last packet send/receive, for keepalive. Not real-world clock */ |
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163 time_t last_packet_time_keepalive_sent; |
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164 time_t last_packet_time_keepalive_recv; |
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165 time_t last_packet_time_any_sent; |
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166 |
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167 time_t last_packet_time_idle; /* time of the last packet transmission or receive, for |
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168 idle timeout purposes so ignores SSH_MSG_IGNORE |
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169 or responses to keepalives. Not real-world clock */ |
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170 |
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171 |
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172 /* KEX/encryption related */ |
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173 struct KEXState kexstate; |
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174 struct key_context *keys; |
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175 struct key_context *newkeys; |
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176 buffer *session_id; /* this is the hash from the first kex */ |
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177 /* The below are used temporarily during kex, are freed after use */ |
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178 mp_int * dh_K; /* SSH_MSG_KEXDH_REPLY and sending SSH_MSH_NEWKEYS */ |
761
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179 buffer *hash; /* the session hash */ |
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180 buffer* kexhashbuf; /* session hash buffer calculated from various packets*/ |
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181 buffer* transkexinit; /* the kexinit packet we send should be kept so we |
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182 can add it to the hash when generating keys */ |
575
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183 |
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184 /* Enables/disables compression */ |
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185 algo_type *compress_algos; |
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186 |
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187 /* a list of queued replies that should be sent after a KEX has |
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188 concluded (ie, while dataallowed was unset)*/ |
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189 struct packetlist *reply_queue_head, *reply_queue_tail; |
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190 |
33 | 191 void(*remoteclosed)(); /* A callback to handle closure of the |
192 remote connection */ | |
193 | |
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194 void(*extra_session_cleanup)(); /* client or server specific cleanup */ |
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195 void(*send_kex_first_guess)(); |
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196 |
33 | 197 struct AuthState authstate; /* Common amongst client and server, since most |
198 struct elements are common */ | |
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199 |
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200 /* Channel related */ |
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201 struct Channel ** channels; /* these pointers may be null */ |
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202 unsigned int chansize; /* the number of Channel*s allocated for channels */ |
37 | 203 unsigned int chancount; /* the number of Channel*s in use */ |
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204 const struct ChanType **chantypes; /* The valid channel types */ |
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205 int channel_signal_pending; /* Flag set by sigchld handler */ |
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206 |
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207 /* TCP priority level for the main "port 22" tcp socket */ |
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208 enum dropbear_prio socket_prio; |
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209 |
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210 /* TCP forwarding - where manage listeners */ |
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211 struct Listener ** listeners; |
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212 unsigned int listensize; |
156
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213 |
21
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214 /* Whether to allow binding to privileged ports (<1024). This doesn't |
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215 * really belong here, but nowhere else fits nicely */ |
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216 int allowprivport; |
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217 |
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218 }; |
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219 |
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220 struct serversession { |
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221 |
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222 /* Server specific options */ |
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223 int childpipe; /* kept open until we successfully authenticate */ |
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224 /* userauth */ |
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225 |
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226 struct ChildPid * childpids; /* array of mappings childpid<->channel */ |
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227 unsigned int childpidsize; |
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228 |
130
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229 /* Used to avoid a race in the exit returncode handling - see |
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230 * svr-chansession.c for details */ |
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231 struct exitinfo lastexit; |
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232 |
158
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233 /* The numeric address they connected from, used for logging */ |
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234 char * addrstring; |
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235 |
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236 /* The resolved remote address, used for lastlog etc */ |
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237 char *remotehost; |
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238 |
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239 #ifdef USE_VFORK |
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240 pid_t server_pid; |
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241 #endif |
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242 |
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243 }; |
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244 |
26 | 245 typedef enum { |
33 | 246 KEX_NOTHING, |
26 | 247 KEXINIT_RCVD, |
248 KEXDH_INIT_SENT, | |
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249 KEXDONE |
33 | 250 } cli_kex_state; |
251 | |
252 typedef enum { | |
253 STATE_NOTHING, | |
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254 USERAUTH_WAIT, |
33 | 255 USERAUTH_REQ_SENT, |
256 USERAUTH_FAIL_RCVD, | |
37 | 257 USERAUTH_SUCCESS_RCVD, |
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258 SESSION_RUNNING |
26 | 259 } cli_state; |
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260 |
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261 struct clientsession { |
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262 |
857 | 263 /* XXX - move these to kexstate? */ |
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264 struct kex_dh_param *dh_param; |
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265 struct kex_ecdh_param *ecdh_param; |
848 | 266 struct kex_curve25519_param *curve25519_param; |
801 | 267 const struct dropbear_kex *param_kex_algo; /* KEX algorithm corresponding to current dh_e and dh_x */ |
268 | |
33 | 269 cli_kex_state kex_state; /* Used for progressing KEX */ |
270 cli_state state; /* Used to progress auth/channelsession etc */ | |
26 | 271 unsigned donefirstkex : 1; /* Set when we set sentnewkeys, never reset */ |
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272 |
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273 int tty_raw_mode; /* Whether we're in raw mode (and have to clean up) */ |
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274 struct termios saved_tio; |
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275 int stdincopy; |
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276 int stdinflags; |
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277 int stdoutcopy; |
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278 int stdoutflags; |
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279 int stderrcopy; |
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280 int stderrflags; |
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281 |
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282 /* for escape char handling */ |
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283 int last_char; |
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284 |
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285 int winchange; /* Set to 1 when a windowchange signal happens */ |
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286 |
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287 int lastauthtype; /* either AUTH_TYPE_PUBKEY or AUTH_TYPE_PASSWORD, |
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288 for the last type of auth we tried */ |
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289 int ignore_next_auth_response; |
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290 #ifdef ENABLE_CLI_INTERACT_AUTH |
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291 int auth_interact_failed; /* flag whether interactive auth can still |
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292 be used */ |
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293 int interact_request_received; /* flag whether we've received an |
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294 info request from the server for |
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295 interactive auth.*/ |
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296 #endif |
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297 int cipher_none_after_auth; /* Set to 1 if the user requested "none" |
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298 auth */ |
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299 sign_key *lastprivkey; |
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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_ */ |