annotate common-session.c @ 1020:363c0feca5d4

Fix print that no longer works since we're not using fourCCs
author Matt Johnston <matt@ucc.asn.au>
date Fri, 13 Feb 2015 23:17:23 +0800
parents 0bb16232e7c4
children 24135c8e1d46
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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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44
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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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48
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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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51
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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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54 time_t now;
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56 TRACE(("enter session_init"))
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57
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58 ses.sock_in = sock_in;
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59 ses.sock_out = sock_out;
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60 ses.maxfd = MAX(sock_in, sock_out);
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61
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62 ses.socket_prio = DROPBEAR_PRIO_DEFAULT;
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63 /* Sets it to lowdelay */
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64 update_channel_prio();
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65
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66 now = monotonic_now();
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67 ses.last_packet_time_keepalive_recv = now;
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68 ses.last_packet_time_idle = now;
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69 ses.last_packet_time_any_sent = 0;
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70 ses.last_packet_time_keepalive_sent = 0;
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71
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72 if (pipe(ses.signal_pipe) < 0) {
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73 dropbear_exit("Signal pipe failed");
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74 }
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75 setnonblocking(ses.signal_pipe[0]);
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76 setnonblocking(ses.signal_pipe[1]);
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78 ses.maxfd = MAX(ses.maxfd, ses.signal_pipe[0]);
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79 ses.maxfd = MAX(ses.maxfd, ses.signal_pipe[1]);
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80
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81 kexfirstinitialise(); /* initialise the kex state */
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82
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83 ses.writepayload = buf_new(TRANS_MAX_PAYLOAD_LEN);
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84 ses.transseq = 0;
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85
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86 ses.readbuf = NULL;
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87 ses.payload = NULL;
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88 ses.recvseq = 0;
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89
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90 initqueue(&ses.writequeue);
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91
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92 ses.requirenext = SSH_MSG_KEXINIT;
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93 ses.dataallowed = 1; /* we can send data until we actually
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94 send the SSH_MSG_KEXINIT */
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95 ses.ignorenext = 0;
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96 ses.lastpacket = 0;
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97 ses.reply_queue_head = NULL;
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98 ses.reply_queue_tail = NULL;
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99
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100 /* set all the algos to none */
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101 ses.keys = (struct key_context*)m_malloc(sizeof(struct key_context));
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102 ses.newkeys = NULL;
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103 ses.keys->recv.algo_crypt = &dropbear_nocipher;
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104 ses.keys->trans.algo_crypt = &dropbear_nocipher;
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105 ses.keys->recv.crypt_mode = &dropbear_mode_none;
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106 ses.keys->trans.crypt_mode = &dropbear_mode_none;
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107
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108 ses.keys->recv.algo_mac = &dropbear_nohash;
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109 ses.keys->trans.algo_mac = &dropbear_nohash;
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110
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111 ses.keys->algo_kex = NULL;
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112 ses.keys->algo_hostkey = -1;
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113 ses.keys->recv.algo_comp = DROPBEAR_COMP_NONE;
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114 ses.keys->trans.algo_comp = DROPBEAR_COMP_NONE;
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115
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116 #ifndef DISABLE_ZLIB
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117 ses.keys->recv.zstream = NULL;
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118 ses.keys->trans.zstream = NULL;
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119 #endif
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120
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121 /* key exchange buffers */
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122 ses.session_id = NULL;
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123 ses.kexhashbuf = NULL;
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124 ses.transkexinit = NULL;
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125 ses.dh_K = NULL;
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126 ses.remoteident = NULL;
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127
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128 ses.chantypes = NULL;
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129
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130 ses.allowprivport = 0;
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131
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132 TRACE(("leave session_init"))
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133 }
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134
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135 void session_loop(void(*loophandler)()) {
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136
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137 fd_set readfd, writefd;
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138 struct timeval timeout;
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139 int val;
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140
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141 /* main loop, select()s for all sockets in use */
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142 for(;;) {
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143
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144 timeout.tv_sec = select_timeout();
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145 timeout.tv_usec = 0;
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146 FD_ZERO(&writefd);
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147 FD_ZERO(&readfd);
241
c5d3ef11155f * use own assertions which should get logged properly
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diff changeset
148 dropbear_assert(ses.payload == NULL);
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149
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150 /* during initial setup we flush out the KEXINIT packet before
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diff changeset
151 * attempting to read the remote version string, which might block */
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diff changeset
152 if (ses.sock_in != -1 && (ses.remoteident || isempty(&ses.writequeue))) {
479
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diff changeset
153 FD_SET(ses.sock_in, &readfd);
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diff changeset
154 }
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
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parents: 454
diff changeset
155 if (ses.sock_out != -1 && !isempty(&ses.writequeue)) {
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
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diff changeset
156 FD_SET(ses.sock_out, &writefd);
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157 }
416
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diff changeset
158
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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diff changeset
159 /* We get woken up when signal handlers write to this pipe.
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diff changeset
160 SIGCHLD in svr-chansession is the only one currently. */
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diff changeset
161 FD_SET(ses.signal_pipe[0], &readfd);
26
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162
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diff changeset
163 /* set up for channels which can be read/written */
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diff changeset
164 setchannelfds(&readfd, &writefd);
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diff changeset
165
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166 val = select(ses.maxfd+1, &readfd, &writefd, NULL, &timeout);
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diff changeset
167
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diff changeset
168 if (exitflag) {
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diff changeset
169 dropbear_exit("Terminated by signal");
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170 }
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171
373
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diff changeset
172 if (val < 0 && errno != EINTR) {
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
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diff changeset
173 dropbear_exit("Error in select");
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
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diff changeset
174 }
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
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diff changeset
175
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
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diff changeset
176 if (val <= 0) {
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diff changeset
177 /* If we were interrupted or the select timed out, we still
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diff changeset
178 * want to iterate over channels etc for reading, to handle
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diff changeset
179 * server processes exiting etc.
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diff changeset
180 * We don't want to read/write FDs. */
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parents: 344
diff changeset
181 FD_ZERO(&writefd);
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diff changeset
182 FD_ZERO(&readfd);
26
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183 }
416
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diff changeset
184
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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diff changeset
185 /* We'll just empty out the pipe if required. We don't do
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parents: 373
diff changeset
186 any thing with the data, since the pipe's purpose is purely to
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parents: 373
diff changeset
187 wake up the select() above. */
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parents: 373
diff changeset
188 if (FD_ISSET(ses.signal_pipe[0], &readfd)) {
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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parents: 373
diff changeset
189 char x;
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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parents: 373
diff changeset
190 while (read(ses.signal_pipe[0], &x, 1) > 0) {}
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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parents: 373
diff changeset
191 }
26
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diff changeset
192
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diff changeset
193 /* check for auth timeout, rekeying required etc */
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diff changeset
194 checktimeouts();
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diff changeset
195
929
9d40ed1da686 Experiment of always writing data if available. Might waste a writev() with
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diff changeset
196 /* process session socket's incoming data */
479
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
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parents: 454
diff changeset
197 if (ses.sock_in != -1) {
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
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parents: 454
diff changeset
198 if (FD_ISSET(ses.sock_in, &readfd)) {
726
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diff changeset
199 if (!ses.remoteident) {
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diff changeset
200 /* blocking read of the version string */
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diff changeset
201 read_session_identification();
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parents: 705
diff changeset
202 } else {
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diff changeset
203 read_packet();
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parents: 705
diff changeset
204 }
26
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diff changeset
205 }
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parents: 24
diff changeset
206
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diff changeset
207 /* Process the decrypted packet. After this, the read buffer
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parents: 24
diff changeset
208 * will be ready for a new packet */
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parents: 24
diff changeset
209 if (ses.payload != NULL) {
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diff changeset
210 process_packet();
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parents: 24
diff changeset
211 }
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diff changeset
212 }
452
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
213
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
214 /* if required, flush out any queued reply packets that
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
215 were being held up during a KEX */
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
216 maybe_flush_reply_queue();
26
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diff changeset
217
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diff changeset
218 /* process pipes etc for the channels, ses.dataallowed == 0
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diff changeset
219 * during rekeying ) */
896
a1a97e98b0c1 Read (and enqueue) packets from interactive input even when
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diff changeset
220 channelio(&readfd, &writefd);
26
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diff changeset
221
929
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diff changeset
222 /* process session socket's outgoing data */
9d40ed1da686 Experiment of always writing data if available. Might waste a writev() with
Matt Johnston <matt@ucc.asn.au>
parents: 928
diff changeset
223 if (ses.sock_out != -1) {
9d40ed1da686 Experiment of always writing data if available. Might waste a writev() with
Matt Johnston <matt@ucc.asn.au>
parents: 928
diff changeset
224 if (!isempty(&ses.writequeue)) {
9d40ed1da686 Experiment of always writing data if available. Might waste a writev() with
Matt Johnston <matt@ucc.asn.au>
parents: 928
diff changeset
225 write_packet();
9d40ed1da686 Experiment of always writing data if available. Might waste a writev() with
Matt Johnston <matt@ucc.asn.au>
parents: 928
diff changeset
226 }
9d40ed1da686 Experiment of always writing data if available. Might waste a writev() with
Matt Johnston <matt@ucc.asn.au>
parents: 928
diff changeset
227 }
9d40ed1da686 Experiment of always writing data if available. Might waste a writev() with
Matt Johnston <matt@ucc.asn.au>
parents: 928
diff changeset
228
9d40ed1da686 Experiment of always writing data if available. Might waste a writev() with
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parents: 928
diff changeset
229
26
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parents: 24
diff changeset
230 if (loophandler) {
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parents: 24
diff changeset
231 loophandler();
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diff changeset
232 }
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parents: 24
diff changeset
233
0969767bca0d snapshot of stuff
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parents: 24
diff changeset
234 } /* for(;;) */
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parents: 24
diff changeset
235
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diff changeset
236 /* Not reached */
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parents: 24
diff changeset
237 }
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diff changeset
238
4
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parents:
diff changeset
239 /* clean up a session on exit */
733
70811267715c Run the cleanup handler also when we close due to TCP connection being closed
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
240 void session_cleanup() {
4
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parents:
diff changeset
241
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 135
diff changeset
242 TRACE(("enter session_cleanup"))
4
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parents:
diff changeset
243
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
244 /* we can't cleanup if we don't know the session state */
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parents:
diff changeset
245 if (!sessinitdone) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 135
diff changeset
246 TRACE(("leave session_cleanup: !sessinitdone"))
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
247 return;
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parents:
diff changeset
248 }
733
70811267715c Run the cleanup handler also when we close due to TCP connection being closed
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parents: 726
diff changeset
249
70811267715c Run the cleanup handler also when we close due to TCP connection being closed
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
250 if (ses.extra_session_cleanup) {
70811267715c Run the cleanup handler also when we close due to TCP connection being closed
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
251 ses.extra_session_cleanup();
70811267715c Run the cleanup handler also when we close due to TCP connection being closed
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
252 }
891
e78f5ce6e7bb cleanup before clearing keys
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parents: 886
diff changeset
253
e78f5ce6e7bb cleanup before clearing keys
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parents: 886
diff changeset
254 chancleanup();
4
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parents:
diff changeset
255
891
e78f5ce6e7bb cleanup before clearing keys
Matt Johnston <matt@ucc.asn.au>
parents: 886
diff changeset
256 /* Cleaning up keys must happen after other cleanup
e78f5ce6e7bb cleanup before clearing keys
Matt Johnston <matt@ucc.asn.au>
parents: 886
diff changeset
257 functions which might queue packets */
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
258 if (ses.session_id) {
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
259 buf_burn(ses.session_id);
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
260 buf_free(ses.session_id);
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
261 ses.session_id = NULL;
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
262 }
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
263 if (ses.hash) {
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
264 buf_burn(ses.hash);
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
265 buf_free(ses.hash);
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
266 ses.hash = NULL;
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
267 }
4
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parents:
diff changeset
268 m_burn(ses.keys, sizeof(struct key_context));
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parents:
diff changeset
269 m_free(ses.keys);
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parents:
diff changeset
270
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 135
diff changeset
271 TRACE(("leave session_cleanup"))
4
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parents:
diff changeset
272 }
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
273
726
78eda530c000 send out our kexinit packet before blocking to read the SSH version string
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
274 void send_session_identification() {
751
685d05f1cc5c Just put the version string on the queue, don't use atomicio
Matt Johnston <matt@ucc.asn.au>
parents: 733
diff changeset
275 buffer *writebuf = buf_new(strlen(LOCAL_IDENT "\r\n") + 1);
685d05f1cc5c Just put the version string on the queue, don't use atomicio
Matt Johnston <matt@ucc.asn.au>
parents: 733
diff changeset
276 buf_putbytes(writebuf, LOCAL_IDENT "\r\n", strlen(LOCAL_IDENT "\r\n"));
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
277 buf_putbyte(writebuf, 0x0); /* packet type */
751
685d05f1cc5c Just put the version string on the queue, don't use atomicio
Matt Johnston <matt@ucc.asn.au>
parents: 733
diff changeset
278 buf_setpos(writebuf, 0);
685d05f1cc5c Just put the version string on the queue, don't use atomicio
Matt Johnston <matt@ucc.asn.au>
parents: 733
diff changeset
279 enqueue(&ses.writequeue, writebuf);
726
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diff changeset
280 }
4
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parents:
diff changeset
281
726
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parents: 705
diff changeset
282 static void read_session_identification() {
4
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parents:
diff changeset
283 /* max length of 255 chars */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
284 char linebuf[256];
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
285 int len = 0;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
286 char done = 0;
103
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
287 int i;
513
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
288 /* If they send more than 50 lines, something is wrong */
275
7f9adaf85fca Exit with a message if the ssh protocol version is incompatible
Matt Johnston <matt@ucc.asn.au>
parents: 242
diff changeset
289 for (i = 0; i < 50; i++) {
479
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
290 len = ident_readln(ses.sock_in, linebuf, sizeof(linebuf));
103
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
291
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
292 if (len < 0 && errno != EINTR) {
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
293 /* It failed */
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
294 break;
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
295 }
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
296
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
297 if (len >= 4 && memcmp(linebuf, "SSH-", 4) == 0) {
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
298 /* start of line matches */
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
299 done = 1;
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
300 break;
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
301 }
4
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parents:
diff changeset
302 }
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parents:
diff changeset
303
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parents:
diff changeset
304 if (!done) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 135
diff changeset
305 TRACE(("err: %s for '%s'\n", strerror(errno), linebuf))
344
bf29e6659fb9 Just use the normal "remote closed" handler when reading ident stings
Matt Johnston <matt@ucc.asn.au>
parents: 275
diff changeset
306 ses.remoteclosed();
4
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diff changeset
307 } else {
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parents:
diff changeset
308 /* linebuf is already null terminated */
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parents:
diff changeset
309 ses.remoteident = m_malloc(len);
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parents:
diff changeset
310 memcpy(ses.remoteident, linebuf, len);
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parents:
diff changeset
311 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
312
513
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
313 /* Shall assume that 2.x will be backwards compatible. */
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
314 if (strncmp(ses.remoteident, "SSH-2.", 6) != 0
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
315 && strncmp(ses.remoteident, "SSH-1.99-", 9) != 0) {
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
316 dropbear_exit("Incompatible remote version '%s'", ses.remoteident);
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
317 }
275
7f9adaf85fca Exit with a message if the ssh protocol version is incompatible
Matt Johnston <matt@ucc.asn.au>
parents: 242
diff changeset
318
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 135
diff changeset
319 TRACE(("remoteident: %s", ses.remoteident))
4
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parents:
diff changeset
320
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
321 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
322
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
323 /* returns the length including null-terminating zero on success,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
324 * or -1 on failure */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
325 static int ident_readln(int fd, char* buf, int count) {
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
326
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
327 char in;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
328 int pos = 0;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
329 int num = 0;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
330 fd_set fds;
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
331 struct timeval timeout;
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
332
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 135
diff changeset
333 TRACE(("enter ident_readln"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
334
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
335 if (count < 1) {
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
336 return -1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
337 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
338
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
339 FD_ZERO(&fds);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
340
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
341 /* select since it's a non-blocking fd */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
342
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
343 /* leave space to null-terminate */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
344 while (pos < count-1) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
345
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
346 FD_SET(fd, &fds);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
347
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
348 timeout.tv_sec = 1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
349 timeout.tv_usec = 0;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
350 if (select(fd+1, &fds, NULL, NULL, &timeout) < 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
351 if (errno == EINTR) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
352 continue;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
353 }
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 135
diff changeset
354 TRACE(("leave ident_readln: select error"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
355 return -1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
356 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
357
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
358 checktimeouts();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
359
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
360 /* Have to go one byte at a time, since we don't want to read past
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
361 * the end, and have to somehow shove bytes back into the normal
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
362 * packet reader */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
363 if (FD_ISSET(fd, &fds)) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
364 num = read(fd, &in, 1);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
365 /* a "\n" is a newline, "\r" we want to read in and keep going
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
366 * so that it won't be read as part of the next line */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
367 if (num < 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
368 /* error */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
369 if (errno == EINTR) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
370 continue; /* not a real error */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
371 }
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 135
diff changeset
372 TRACE(("leave ident_readln: read error"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
373 return -1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
374 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
375 if (num == 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
376 /* EOF */
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 135
diff changeset
377 TRACE(("leave ident_readln: EOF"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
378 return -1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
379 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
380 if (in == '\n') {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
381 /* end of ident string */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
382 break;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
383 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
384 /* we don't want to include '\r's */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
385 if (in != '\r') {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
386 buf[pos] = in;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
387 pos++;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
388 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
389 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
390 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
391
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
392 buf[pos] = '\0';
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 135
diff changeset
393 TRACE(("leave ident_readln: return %d", pos+1))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
394 return pos+1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
395 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
396
970
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
397 void ignore_recv_response() {
968
f7f6c15b0ec3 Don't send SSH_MSG_UNIMPLEMENTED for keepalive responses
Matt Johnston <matt@ucc.asn.au>
parents: 941
diff changeset
398 // Do nothing
970
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
399 TRACE(("Ignored msg_request_response"))
968
f7f6c15b0ec3 Don't send SSH_MSG_UNIMPLEMENTED for keepalive responses
Matt Johnston <matt@ucc.asn.au>
parents: 941
diff changeset
400 }
f7f6c15b0ec3 Don't send SSH_MSG_UNIMPLEMENTED for keepalive responses
Matt Johnston <matt@ucc.asn.au>
parents: 941
diff changeset
401
939
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
402 static void send_msg_keepalive() {
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
403 CHECKCLEARTOWRITE();
939
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
404 time_t old_time_idle = ses.last_packet_time_idle;
970
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
405
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
406 struct Channel *chan = get_any_ready_channel();
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
407
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
408 if (chan) {
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
409 /* Channel requests are preferable, more implementations
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
410 handle them than SSH_MSG_GLOBAL_REQUEST */
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
411 TRACE(("keepalive channel request %d", chan->index))
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
412 start_send_channel_request(chan, DROPBEAR_KEEPALIVE_STRING);
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
413 } else {
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
414 TRACE(("keepalive global request"))
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
415 /* Some peers will reply with SSH_MSG_REQUEST_FAILURE,
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
416 some will reply with SSH_MSG_UNIMPLEMENTED, some will exit. */
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
417 buf_putbyte(ses.writepayload, SSH_MSG_GLOBAL_REQUEST);
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
418 buf_putstring(ses.writepayload, DROPBEAR_KEEPALIVE_STRING,
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
419 strlen(DROPBEAR_KEEPALIVE_STRING));
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
420 }
939
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
421 buf_putbyte(ses.writepayload, 1); /* want_reply */
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
422 encrypt_packet();
939
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
423
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
424 ses.last_packet_time_keepalive_sent = monotonic_now();
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
425
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
426 /* keepalives shouldn't update idle timeout, reset it back */
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
427 ses.last_packet_time_idle = old_time_idle;
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
428 }
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
429
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
430 /* Check all timeouts which are required. Currently these are the time for
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
431 * user authentication, and the automatic rekeying. */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
432 static void checktimeouts() {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
433
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
434 time_t now;
928
7cd89d4e0335 Add new monotonic_now() wrapper so that timeouts are unaffected by
Matt Johnston <matt@ucc.asn.au>
parents: 927
diff changeset
435 now = monotonic_now();
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
436
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
437 /* we can't rekey if we haven't done remote ident exchange yet */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
438 if (ses.remoteident == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
439 return;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
440 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
441
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
442 if (!ses.kexstate.sentkexinit
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
443 && (now - ses.kexstate.lastkextime >= KEX_REKEY_TIMEOUT
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
444 || ses.kexstate.datarecv+ses.kexstate.datatrans >= KEX_REKEY_DATA)) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 135
diff changeset
445 TRACE(("rekeying after timeout or max data reached"))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
446 send_msg_kexinit();
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
447 }
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
448
970
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
449 if (opts.keepalive_secs > 0 && ses.authstate.authdone) {
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
450 /* Avoid sending keepalives prior to auth - those are
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
451 not valid pre-auth packet types */
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
452
939
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
453 /* Send keepalives if we've been idle */
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
454 if (now - ses.last_packet_time_any_sent >= opts.keepalive_secs) {
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
455 send_msg_keepalive();
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
456 }
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
457
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
458 /* Also send an explicit keepalive message to trigger a response
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
459 if the remote end hasn't sent us anything */
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
460 if (now - ses.last_packet_time_keepalive_recv >= opts.keepalive_secs
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
461 && now - ses.last_packet_time_keepalive_sent >= opts.keepalive_secs) {
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
462 send_msg_keepalive();
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
463 }
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
464
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
465 if (now - ses.last_packet_time_keepalive_recv
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
466 >= opts.keepalive_secs * DEFAULT_KEEPALIVE_LIMIT) {
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
467 dropbear_exit("Keepalive timeout");
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
468 }
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
469 }
513
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
470
939
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
471 if (opts.idle_timeout_secs > 0
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
472 && now - ses.last_packet_time_idle >= opts.idle_timeout_secs) {
513
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
473 dropbear_close("Idle timeout");
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
474 }
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
475 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
476
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
477 static long select_timeout() {
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
478 /* determine the minimum timeout that might be required, so
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
479 as to avoid waking when unneccessary */
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
480 long ret = LONG_MAX;
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
481 if (KEX_REKEY_TIMEOUT > 0)
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
482 ret = MIN(KEX_REKEY_TIMEOUT, ret);
926
b8208506322e Use AUTH_TIMEOUT only before authdone != 1.
Yousong Zhou <yszhou4tech@gmail.com>
parents: 896
diff changeset
483 /* AUTH_TIMEOUT is only relevant before authdone */
927
122fb3532038 Fix typo
Matt Johnston <matt@ucc.asn.au>
parents: 926
diff changeset
484 if (ses.authstate.authdone != 1 && AUTH_TIMEOUT > 0)
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
485 ret = MIN(AUTH_TIMEOUT, ret);
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
486 if (opts.keepalive_secs > 0)
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
487 ret = MIN(opts.keepalive_secs, ret);
926
b8208506322e Use AUTH_TIMEOUT only before authdone != 1.
Yousong Zhou <yszhou4tech@gmail.com>
parents: 896
diff changeset
488 if (opts.idle_timeout_secs > 0)
b8208506322e Use AUTH_TIMEOUT only before authdone != 1.
Yousong Zhou <yszhou4tech@gmail.com>
parents: 896
diff changeset
489 ret = MIN(opts.idle_timeout_secs, ret);
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
490 return ret;
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
491 }
482
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
492
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
493 const char* get_user_shell() {
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
494 /* an empty shell should be interpreted as "/bin/sh" */
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
495 if (ses.authstate.pw_shell[0] == '\0') {
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
496 return "/bin/sh";
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
497 } else {
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
498 return ses.authstate.pw_shell;
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
499 }
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
500 }
483
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
501 void fill_passwd(const char* username) {
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
502 struct passwd *pw = NULL;
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
503 if (ses.authstate.pw_name)
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
504 m_free(ses.authstate.pw_name);
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
505 if (ses.authstate.pw_dir)
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
506 m_free(ses.authstate.pw_dir);
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
507 if (ses.authstate.pw_shell)
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
508 m_free(ses.authstate.pw_shell);
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
509 if (ses.authstate.pw_passwd)
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
510 m_free(ses.authstate.pw_passwd);
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
511
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
512 pw = getpwnam(username);
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
513 if (!pw) {
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
514 return;
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
515 }
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
516 ses.authstate.pw_uid = pw->pw_uid;
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
517 ses.authstate.pw_gid = pw->pw_gid;
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
518 ses.authstate.pw_name = m_strdup(pw->pw_name);
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
519 ses.authstate.pw_dir = m_strdup(pw->pw_dir);
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
520 ses.authstate.pw_shell = m_strdup(pw->pw_shell);
676
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
521 {
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
522 char *passwd_crypt = pw->pw_passwd;
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
523 #ifdef HAVE_SHADOW_H
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
524 /* get the shadow password if possible */
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
525 struct spwd *spasswd = getspnam(ses.authstate.pw_name);
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
526 if (spasswd && spasswd->sp_pwdp) {
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
527 passwd_crypt = spasswd->sp_pwdp;
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
528 }
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
529 #endif
705
2e573f39b88e Android returns NULL for pw_crypt, set it to something else
Matt Johnston <matt@ucc.asn.au>
parents: 676
diff changeset
530 if (!passwd_crypt) {
2e573f39b88e Android returns NULL for pw_crypt, set it to something else
Matt Johnston <matt@ucc.asn.au>
parents: 676
diff changeset
531 /* android supposedly returns NULL */
2e573f39b88e Android returns NULL for pw_crypt, set it to something else
Matt Johnston <matt@ucc.asn.au>
parents: 676
diff changeset
532 passwd_crypt = "!!";
2e573f39b88e Android returns NULL for pw_crypt, set it to something else
Matt Johnston <matt@ucc.asn.au>
parents: 676
diff changeset
533 }
676
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
534 ses.authstate.pw_passwd = m_strdup(passwd_crypt);
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
535 }
483
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
536 }
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
537
941
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
538 /* Called when channels are modified */
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
539 void update_channel_prio() {
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
540 enum dropbear_prio new_prio;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
541 int any = 0;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
542 unsigned int i;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
543
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
544 TRACE(("update_channel_prio"))
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
545
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
546 new_prio = DROPBEAR_PRIO_BULK;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
547 for (i = 0; i < ses.chansize; i++) {
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
548 struct Channel *channel = ses.channels[i];
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
549 if (!channel || channel->prio == DROPBEAR_CHANNEL_PRIO_EARLY) {
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
550 if (channel && channel->prio == DROPBEAR_CHANNEL_PRIO_EARLY) {
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
551 TRACE(("update_channel_prio: early %d", channel->index))
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
552 }
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
553 continue;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
554 }
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
555 any = 1;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
556 if (channel->prio == DROPBEAR_CHANNEL_PRIO_INTERACTIVE)
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
557 {
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
558 TRACE(("update_channel_prio: lowdelay %d", channel->index))
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
559 new_prio = DROPBEAR_PRIO_LOWDELAY;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
560 break;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
561 } else if (channel->prio == DROPBEAR_CHANNEL_PRIO_UNKNOWABLE
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
562 && new_prio == DROPBEAR_PRIO_BULK)
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
563 {
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
564 TRACE(("update_channel_prio: unknowable %d", channel->index))
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
565 new_prio = DROPBEAR_PRIO_DEFAULT;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
566 }
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
567 }
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
568
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
569 if (any == 0) {
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
570 /* lowdelay during setup */
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
571 TRACE(("update_channel_prio: not any"))
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
572 new_prio = DROPBEAR_PRIO_LOWDELAY;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
573 }
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
574
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
575 if (new_prio != ses.socket_prio) {
1020
363c0feca5d4 Fix print that no longer works since we're not using fourCCs
Matt Johnston <matt@ucc.asn.au>
parents: 970
diff changeset
576 TRACE(("Dropbear priority transitioning %d -> %d", ses.socket_prio, new_prio))
941
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
577 set_sock_priority(ses.sock_out, new_prio);
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
578 ses.socket_prio = new_prio;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
579 }
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
580 }
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
581