Mercurial > dropbear

annotate common-session.c @ 896:a1a97e98b0c1

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Read (and enqueue) packets from interactive input even when we're waiting for a key exchange. This should hopefully fix the situation where "~." doesn't work to terminate a client session when a laptop wakes up. The client will be stuck waiting for a key exchange on a dead connection, so won't have read the escape character
author Matt Johnston <matt@ucc.asn.au>
date Mon, 17 Feb 2014 21:41:06 +0800
parents e78f5ce6e7bb
children bae0b34bc059 b8208506322e
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 #include "includes.h"
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26 #include "session.h"
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27 #include "dbutil.h"
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28 #include "packet.h"
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29 #include "algo.h"
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30 #include "buffer.h"
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31 #include "dss.h"
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32 #include "ssh.h"
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33 #include "dbrandom.h"
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34 #include "kex.h"
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35 #include "channel.h"
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36 #include "runopts.h"
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37
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38 static void checktimeouts();
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39 static long select_timeout();
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40 static int ident_readln(int fd, char* buf, int count);
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41 static void read_session_identification();
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42
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43 struct sshsession ses; /* GLOBAL */
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45 /* need to know if the session struct has been initialised, this way isn't the
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46 * cleanest, but works OK */
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47 int sessinitdone = 0; /* GLOBAL */
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49 /* this is set when we get SIGINT or SIGTERM, the handler is in main.c */
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50 int exitflag = 0; /* GLOBAL */
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52 /* called only at the start of a session, set up initial state */
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53 void common_session_init(int sock_in, int sock_out) {
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55 TRACE(("enter session_init"))
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56
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57 ses.sock_in = sock_in;
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58 ses.sock_out = sock_out;
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59 ses.maxfd = MAX(sock_in, sock_out);
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60
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61 ses.connect_time = 0;
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62 ses.last_trx_packet_time = 0;
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63 ses.last_packet_time = 0;
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64
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65 if (pipe(ses.signal_pipe) < 0) {
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66 dropbear_exit("Signal pipe failed");
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67 }
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68 setnonblocking(ses.signal_pipe[0]);
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69 setnonblocking(ses.signal_pipe[1]);
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71 ses.maxfd = MAX(ses.maxfd, ses.signal_pipe[0]);
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72 ses.maxfd = MAX(ses.maxfd, ses.signal_pipe[1]);
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73
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74 kexfirstinitialise(); /* initialise the kex state */
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75
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76 ses.writepayload = buf_new(TRANS_MAX_PAYLOAD_LEN);
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77 ses.transseq = 0;
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78
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79 ses.readbuf = NULL;
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80 ses.payload = NULL;
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81 ses.recvseq = 0;
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82
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83 initqueue(&ses.writequeue);
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84
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85 ses.requirenext = SSH_MSG_KEXINIT;
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86 ses.dataallowed = 1; /* we can send data until we actually
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87 send the SSH_MSG_KEXINIT */
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88 ses.ignorenext = 0;
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89 ses.lastpacket = 0;
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90 ses.reply_queue_head = NULL;
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91 ses.reply_queue_tail = NULL;
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93 /* set all the algos to none */
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94 ses.keys = (struct key_context*)m_malloc(sizeof(struct key_context));
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95 ses.newkeys = NULL;
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96 ses.keys->recv.algo_crypt = &dropbear_nocipher;
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97 ses.keys->trans.algo_crypt = &dropbear_nocipher;
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98 ses.keys->recv.crypt_mode = &dropbear_mode_none;
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99 ses.keys->trans.crypt_mode = &dropbear_mode_none;
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100
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101 ses.keys->recv.algo_mac = &dropbear_nohash;
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102 ses.keys->trans.algo_mac = &dropbear_nohash;
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103
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104 ses.keys->algo_kex = NULL;
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105 ses.keys->algo_hostkey = -1;
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106 ses.keys->recv.algo_comp = DROPBEAR_COMP_NONE;
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107 ses.keys->trans.algo_comp = DROPBEAR_COMP_NONE;
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108
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109 #ifndef DISABLE_ZLIB
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110 ses.keys->recv.zstream = NULL;
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111 ses.keys->trans.zstream = NULL;
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112 #endif
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113
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114 /* key exchange buffers */
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115 ses.session_id = NULL;
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116 ses.kexhashbuf = NULL;
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117 ses.transkexinit = NULL;
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118 ses.dh_K = NULL;
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119 ses.remoteident = NULL;
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120
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121 ses.chantypes = NULL;
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122
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123 ses.allowprivport = 0;
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124
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125 TRACE(("leave session_init"))
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126 }
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127
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128 void session_loop(void(*loophandler)()) {
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129
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130 fd_set readfd, writefd;
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131 struct timeval timeout;
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132 int val;
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133
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134 /* main loop, select()s for all sockets in use */
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135 for(;;) {
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136
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137 timeout.tv_sec = select_timeout();
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138 timeout.tv_usec = 0;
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139 FD_ZERO(&writefd);
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140 FD_ZERO(&readfd);
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141 dropbear_assert(ses.payload == NULL);
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142
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143 /* during initial setup we flush out the KEXINIT packet before
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144 * attempting to read the remote version string, which might block */
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145 if (ses.sock_in != -1 && (ses.remoteident || isempty(&ses.writequeue))) {
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146 FD_SET(ses.sock_in, &readfd);
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147 }
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148 if (ses.sock_out != -1 && !isempty(&ses.writequeue)) {
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149 FD_SET(ses.sock_out, &writefd);
26
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150 }
416
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151
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152 /* We get woken up when signal handlers write to this pipe.
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153 SIGCHLD in svr-chansession is the only one currently. */