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annotate session.h @ 1854:cba37fe1ddc8

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Fix accidentally committed debug message Was added Oct 18 2021 "Only redirect stderr after the session login."
author Matt Johnston <matt@ucc.asn.au>
date Sat, 22 Jan 2022 12:46:08 +0800
parents df8d8ec1801c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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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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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 cli_dropbear_exit(int exitcode, const char* format, va_list param) ATTRIB_NORETURN;
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68 void cli_dropbear_log(int priority, const char* format, va_list param);
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69 void cleantext(char* dirtytext);
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70 void kill_proxy_command(void);
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72 /* crypto parameters that are stored individually for transmit and receive */
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73 struct key_context_directional {
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74 const struct dropbear_cipher *algo_crypt;
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75 const struct dropbear_cipher_mode *crypt_mode;
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76 const struct dropbear_hash *algo_mac;
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77 int hash_index; /* lookup for libtomcrypt */
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78 int algo_comp; /* compression */
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79 #ifndef DISABLE_ZLIB
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80 z_streamp zstream;
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81 #endif
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82 /* actual keys */
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83 union {
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84 #if DROPBEAR_ENABLE_CBC_MODE
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85 symmetric_CBC cbc;
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86 #endif
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87 #if DROPBEAR_ENABLE_CTR_MODE
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88 symmetric_CTR ctr;
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89 #endif
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90 #if DROPBEAR_ENABLE_GCM_MODE
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91 dropbear_gcm_state gcm;
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92 #endif
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93 #if DROPBEAR_CHACHA20POLY1305
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94 dropbear_chachapoly_state chachapoly;
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95 #endif
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96 } cipher_state;
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97 unsigned char mackey[MAX_MAC_LEN];
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98 int valid;
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99 };
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100
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101 struct key_context {
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102
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103 struct key_context_directional recv;
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104 struct key_context_directional trans;
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105
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106 const struct dropbear_kex *algo_kex;
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107 enum signkey_type algo_hostkey; /* server key type */
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108 enum signature_type algo_signature; /* server signature type */
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109
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110 int allow_compress; /* whether compression has started (useful in
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111 [email protected] delayed compression case) */
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112 };
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113
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114 struct packetlist;
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115 struct packetlist {
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116 struct packetlist *next;
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117 buffer * payload;
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118 };
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119
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120 struct sshsession {
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121
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122 /* Is it a client or server? */
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123 unsigned char isserver;
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124
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125 time_t connect_time; /* time the connection was established
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126 (cleared after auth once we're not
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127 respecting AUTH_TIMEOUT any more).
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128 A monotonic time, not realworld */
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129
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130 int sock_in;
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131 int sock_out;
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132
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133 /* remotehost will be initially NULL as we delay
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134 * reading the remote version string. it will be set
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135 * by the time any recv_() packet methods are called */
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136 char *remoteident;
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137
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138 int maxfd; /* the maximum file descriptor to check with select() */
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139
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140
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141 /* Packet buffers/values etc */
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142 buffer *writepayload; /* Unencrypted payload to write - this is used
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143 throughout the code, as handlers fill out this
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144 buffer with the packet to send. */
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145 struct Queue writequeue; /* A queue of encrypted packets to send */
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146 unsigned int writequeue_len; /* Number of bytes pending to send in writequeue */
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147 buffer *readbuf; /* From the wire, decrypted in-place */
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148 buffer *payload; /* Post-decompression, the actual SSH packet.
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149 May have extra data at the beginning, will be
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150 passed to packet processing functions positioned past
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151 that, see payload_beginning */
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152 unsigned int payload_beginning;
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153 unsigned int transseq, recvseq; /* Sequence IDs */
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154
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155 /* Packet-handling flags */
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156 const packettype * packettypes; /* Packet handler mappings for this
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