Mercurial > dropbear

annotate common-session.c @ 1594:c69df5d5db94

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ciphers/hashes/kex algorithms won't have string lengths, also use dictionary for fuzzer-preauth_nomaths
author Matt Johnston <matt@ucc.asn.au>
date Mon, 05 Mar 2018 21:02:26 +0800
parents 399d8eb961b5
children 60fceff95858
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 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 #include "netio.h"
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38
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39 static void checktimeouts(void);
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40 static long select_timeout(void);
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41 static int ident_readln(int fd, char* buf, int count);
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42 static void read_session_identification(void);
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43
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44 struct sshsession ses; /* GLOBAL */
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46 /* called only at the start of a session, set up initial state */
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47 void common_session_init(int sock_in, int sock_out) {
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48 time_t now;
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49
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50 #if DEBUG_TRACE
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51 debug_start_net();
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52 #endif
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53
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54 TRACE(("enter session_init"))
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55
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56 ses.sock_in = sock_in;
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57 ses.sock_out = sock_out;
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58 ses.maxfd = MAX(sock_in, sock_out);
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59
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60 if (sock_in >= 0) {
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61 setnonblocking(sock_in);
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62 }
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63 if (sock_out >= 0) {
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64 setnonblocking(sock_out);
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65 }
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66
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67 ses.socket_prio = DROPBEAR_PRIO_DEFAULT;
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68 /* Sets it to lowdelay */
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69 update_channel_prio();
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70
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71 now = monotonic_now();
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72 ses.connect_time = now;
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73 ses.last_packet_time_keepalive_recv = now;
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74 ses.last_packet_time_idle = now;
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75 ses.last_packet_time_any_sent = 0;
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76 ses.last_packet_time_keepalive_sent = 0;
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77
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78 #if DROPBEAR_FUZZ
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79 if (!fuzz.fuzzing)
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80 #endif
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81 {
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82 if (pipe(ses.signal_pipe) < 0) {
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83 dropbear_exit("Signal pipe failed");
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84 }
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85 setnonblocking(ses.signal_pipe[0]);
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86 setnonblocking(ses.signal_pipe[1]);
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87 ses.maxfd = MAX(ses.maxfd, ses.signal_pipe[0]);
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88 ses.maxfd = MAX(ses.maxfd, ses.signal_pipe[1]);
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89 }
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90
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91 ses.writepayload = buf_new(TRANS_MAX_PAYLOAD_LEN);
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92 ses.transseq = 0;
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93
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94 ses.readbuf = NULL;
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95 ses.payload = NULL;
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96 ses.recvseq = 0;
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97
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98 initqueue(&ses.writequeue);
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99
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100 ses.requirenext = SSH_MSG_KEXINIT;
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101 ses.dataallowed = 1; /* we can send data until we actually
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102 send the SSH_MSG_KEXINIT */
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103 ses.ignorenext = 0;
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104 ses.lastpacket = 0;
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105 ses.reply_queue_head = NULL;
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106 ses.reply_queue_tail = NULL;
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107
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108 /* set all the algos to none */
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109 ses.keys = (struct key_context*)m_malloc(sizeof(struct key_context));
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110 ses.newkeys = NULL;
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111 ses.keys->recv.algo_crypt = &dropbear_nocipher;
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112 ses.keys->trans.algo_crypt = &dropbear_nocipher;
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113 ses.keys->recv.crypt_mode = &dropbear_mode_none;
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114 ses.keys->trans.crypt_mode = &dropbear_mode_none;
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115
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116 ses.keys->recv.algo_mac = &dropbear_nohash;
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117 ses.keys->trans.algo_mac = &dropbear_nohash;
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118
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119 ses.keys->algo_kex = NULL;
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120 ses.keys->algo_hostkey = -1;
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121 ses.keys->recv.algo_comp = DROPBEAR_COMP_NONE;
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122 ses.keys->trans.algo_comp = DROPBEAR_COMP_NONE;
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123
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124 #ifndef DISABLE_ZLIB
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125 ses.keys->recv.zstream = NULL;
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126 ses.keys->trans.zstream = NULL;
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127 #endif
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128
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129 /* key exchange buffers */
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130 ses.session_id = NULL;
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131 ses.kexhashbuf = NULL;
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132 ses.transkexinit = NULL;
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133 ses.dh_K = NULL;
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134 ses.remoteident = NULL;
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135
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136 ses.chantypes = NULL;
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137
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138 ses.allowprivport = 0;
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139
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140 TRACE(("leave session_init"))
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141 }
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142
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fa733a314bee use a full prototype (#56)
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143 void session_loop(void(*loophandler)(void)) {
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144
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145 fd_set readfd, writefd;
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146 struct timeval timeout;
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147 int val;
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148
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149 /* main loop, select()s for all sockets in use */
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150 for(;;) {
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151 const int writequeue_has_space = (ses.writequeue_len <= 2*TRANS_MAX_PAYLOAD_LEN);
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152
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diff changeset
153 timeout.tv_sec = select_timeout();
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154 timeout.tv_usec = 0;
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diff changeset
155 FD_ZERO(&writefd);
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diff changeset
156 FD_ZERO(&readfd);
241
c5d3ef11155f * use own assertions which should get logged properly
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diff changeset
157 dropbear_assert(ses.payload == NULL);
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158
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159 /* We get woken up when signal handlers write to this pipe.
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160 SIGCHLD in svr-chansession is the only one currently. */
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diff changeset
161 #if DROPBEAR_FUZZ
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162 if (!fuzz.fuzzing)
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163 #endif
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164 {
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165 FD_SET(ses.signal_pipe[0], &readfd);
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166 }
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167
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168 /* set up for channels which can be read/written */
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169 setchannelfds(&readfd, &writefd, writequeue_has_space);
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170
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171 /* Pending connections to test */
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172 set_connect_fds(&writefd);
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173
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174 /* We delay reading from the input socket during initial setup until
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175 after we have written out our initial KEXINIT packet (empty writequeue).
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176 This means our initial packet can be in-flight while we're doing a blocking
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177 read for the remote ident.
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178 We also avoid reading from the socket if the writequeue is full, that avoids
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179 replies backing up */
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180 if (ses.sock_in != -1
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181 && (ses.remoteident || isempty(&ses.writequeue))
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diff changeset
182 && writequeue_has_space) {
479
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
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diff changeset
183 FD_SET(ses.sock_in, &readfd);
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diff changeset
184 }
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185
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186 /* Ordering is important, this test must occur after any other function
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diff changeset
187 might have queued packets (such as connection handlers) */
479
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
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diff changeset
188 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
189 FD_SET(ses.sock_out, &writefd);
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diff changeset
190 }
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191
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diff changeset
192 val = select(ses.maxfd+1, &readfd, &writefd, NULL, &timeout);
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193
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194 if (ses.exitflag) {
26
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diff changeset
195 dropbear_exit("Terminated by signal");
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diff changeset
196 }
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diff changeset
197
373
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
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diff changeset
198 if (val < 0 && errno != EINTR) {
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diff changeset
199 dropbear_exit("Error in select");
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diff changeset
200 }
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
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diff changeset
201
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
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diff changeset
202 if (val <= 0) {
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
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diff changeset
203 /* If we were interrupted or the select timed out, we still
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
204 * want to iterate over channels etc for reading, to handle
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diff changeset
205 * server processes exiting etc.
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
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diff changeset
206 * We don't want to read/write FDs. */
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diff changeset
207 FD_ZERO(&writefd);
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diff changeset
208 FD_ZERO(&readfd);
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diff changeset
209 }
416
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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diff changeset
210
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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diff changeset
211 /* We'll just empty out the pipe if required. We don't do
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diff changeset
212 any thing with the data, since the pipe's purpose is purely to
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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diff changeset
213 wake up the select() above. */
1495
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diff changeset
214 ses.channel_signal_pending = 0;
416
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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parents: 373
diff changeset
215 if (FD_ISSET(ses.signal_pipe[0], &readfd)) {
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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diff changeset
216 char x;
1191
b370b4b172d0 Fix ses.channel_signal_pending race
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diff changeset
217 TRACE(("signal pipe set"))
416
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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parents: 373
diff changeset
218 while (read(ses.signal_pipe[0], &x, 1) > 0) {}
1191
b370b4b172d0 Fix ses.channel_signal_pending race
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diff changeset
219 ses.channel_signal_pending = 1;
416
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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diff changeset
220 }
26
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diff changeset
221
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diff changeset
222 /* check for auth timeout, rekeying required etc */
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diff changeset
223 checktimeouts();
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diff changeset
224
929
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diff changeset
225 /* 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
226 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
227 if (FD_ISSET(ses.sock_in, &readfd)) {
726
78eda530c000 send out our kexinit packet before blocking to read the SSH version string
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parents: 705
diff changeset
228 if (!ses.remoteident) {
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diff changeset
229 /* blocking read of the version string */
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diff changeset
230 read_session_identification();
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parents: 705
diff changeset
231 } else {
78eda530c000 send out our kexinit packet before blocking to read the SSH version string
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diff changeset
232 read_packet();
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diff changeset
233 }
26
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diff changeset
234 }
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parents: 24
diff changeset
235
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diff changeset
236 /* Process the decrypted packet. After this, the read buffer
0969767bca0d snapshot of stuff
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parents: 24
diff changeset
237 * will be ready for a new packet */
0969767bca0d snapshot of stuff
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parents: 24
diff changeset
238 if (ses.payload != NULL) {
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diff changeset
239 process_packet();
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diff changeset
240 }
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diff changeset
241 }
1025
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diff changeset
242
452
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
243 /* 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
244 were being held up during a KEX */
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
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parents: 448
diff changeset
245 maybe_flush_reply_queue();
26
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diff changeset
246
1025
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diff changeset
247 handle_connect_fds(&writefd);
02baa0b334e8 async connections working
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parents: 1021
diff changeset
248
1495
0c16b4ccbd54 make signal flags volatile, simplify handling
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parents: 1316
diff changeset
249 /* loop handler prior to channelio, in case the server loophandler closes
0c16b4ccbd54 make signal flags volatile, simplify handling
Matt Johnston <matt@ucc.asn.au>
parents: 1316
diff changeset
250 channels on process exit */
0c16b4ccbd54 make signal flags volatile, simplify handling
Matt Johnston <matt@ucc.asn.au>
parents: 1316
diff changeset
251 loophandler();
0c16b4ccbd54 make signal flags volatile, simplify handling
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parents: 1316
diff changeset
252
26
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diff changeset
253 /* process pipes etc for the channels, ses.dataallowed == 0
0969767bca0d snapshot of stuff
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parents: 24
diff changeset
254 * during rekeying ) */
896
a1a97e98b0c1 Read (and enqueue) packets from interactive input even when
Matt Johnston <matt@ucc.asn.au>
parents: 891
diff changeset
255 channelio(&readfd, &writefd);
26
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diff changeset
256
929
9d40ed1da686 Experiment of always writing data if available. Might waste a writev() with
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diff changeset
257 /* process session socket's outgoing data */
9d40ed1da686 Experiment of always writing data if available. Might waste a writev() with
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parents: 928
diff changeset
258 if (ses.sock_out != -1) {
9d40ed1da686 Experiment of always writing data if available. Might waste a writev() with
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parents: 928
diff changeset
259 if (!isempty(&ses.writequeue)) {
9d40ed1da686 Experiment of always writing data if available. Might waste a writev() with
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parents: 928
diff changeset
260 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
261 }
9d40ed1da686 Experiment of always writing data if available. Might waste a writev() with
Matt Johnston <matt@ucc.asn.au>
parents: 928
diff changeset
262 }
9d40ed1da686 Experiment of always writing data if available. Might waste a writev() with
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parents: 928
diff changeset
263
26
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diff changeset
264 } /* for(;;) */
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parents: 24
diff changeset
265
0969767bca0d snapshot of stuff
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parents: 24
diff changeset
266 /* Not reached */
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parents: 24
diff changeset
267 }
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diff changeset
268
1040
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
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parents: 1038
diff changeset
269 static void cleanup_buf(buffer **buf) {
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
270 if (!*buf) {
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
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parents: 1038
diff changeset
271 return;
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
272 }
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
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parents: 1038
diff changeset
273 buf_burn(*buf);
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
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parents: 1038
diff changeset
274 buf_free(*buf);
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parents: 1038
diff changeset
275 *buf = NULL;
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parents: 1038
diff changeset
276 }
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
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parents: 1038
diff changeset
277
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
278 /* 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
279 void session_cleanup() {
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
280
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
281 TRACE(("enter session_cleanup"))
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
282
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
283 /* we can't cleanup if we don't know the session state */
1495
0c16b4ccbd54 make signal flags volatile, simplify handling
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parents: 1316
diff changeset
284 if (!ses.init_done) {
0c16b4ccbd54 make signal flags volatile, simplify handling
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parents: 1316
diff changeset
285 TRACE(("leave session_cleanup: !ses.init_done"))
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
286 return;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
287 }
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
288
1079
acf444bcb115 Fix no-writev fallback
Matt Johnston <matt@ucc.asn.au>
parents: 1074
diff changeset
289 /* BEWARE of changing order of functions here. */
1041
3fb883a6aa81 Some additional cleanup functions
Matt Johnston <matt@ucc.asn.au>
parents: 1040
diff changeset
290
3fb883a6aa81 Some additional cleanup functions
Matt Johnston <matt@ucc.asn.au>
parents: 1040
diff changeset
291 /* Must be before extra_session_cleanup() */
3fb883a6aa81 Some additional cleanup functions
Matt Johnston <matt@ucc.asn.au>
parents: 1040
diff changeset
292 chancleanup();
3fb883a6aa81 Some additional cleanup functions
Matt Johnston <matt@ucc.asn.au>
parents: 1040
diff changeset
293
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
294 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
295 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
296 }
891
e78f5ce6e7bb cleanup before clearing keys
Matt Johnston <matt@ucc.asn.au>
parents: 886
diff changeset
297
1079
acf444bcb115 Fix no-writev fallback
Matt Johnston <matt@ucc.asn.au>
parents: 1074
diff changeset
298 /* After these are freed most functions will fail */
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1292
diff changeset
299 #if DROPBEAR_CLEANUP
1040
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
300 /* listeners call cleanup functions, this should occur before
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
301 other session state is freed. */
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
302 remove_all_listeners();
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
303
1050
c2a50c9f509e Add cleanup
Matt Johnston <matt@ucc.asn.au>
parents: 1049
diff changeset
304 remove_connect_pending();
c2a50c9f509e Add cleanup
Matt Johnston <matt@ucc.asn.au>
parents: 1049
diff changeset
305
1040
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
306 while (!isempty(&ses.writequeue)) {
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
307 buf_free(dequeue(&ses.writequeue));
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
308 }
1040
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
309
1358
6b89eb92f872 glaring wrapfd problems fixed
Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
310 m_free(ses.newkeys);
6b89eb92f872 glaring wrapfd problems fixed
Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
311 #ifndef DISABLE_ZLIB
6b89eb92f872 glaring wrapfd problems fixed
Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
312 if (ses.keys->recv.zstream != NULL) {
6b89eb92f872 glaring wrapfd problems fixed
Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
313 if (inflateEnd(ses.keys->recv.zstream) == Z_STREAM_ERROR) {
6b89eb92f872 glaring wrapfd problems fixed
Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
314 dropbear_exit("Crypto error");
6b89eb92f872 glaring wrapfd problems fixed
Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
315 }
6b89eb92f872 glaring wrapfd problems fixed
Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
316 m_free(ses.keys->recv.zstream);
6b89eb92f872 glaring wrapfd problems fixed
Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
317 }
6b89eb92f872 glaring wrapfd problems fixed
Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
318 #endif
6b89eb92f872 glaring wrapfd problems fixed
Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
319
1040
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
320 m_free(ses.remoteident);
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
321 m_free(ses.authstate.pw_dir);
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
322 m_free(ses.authstate.pw_name);
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
323 m_free(ses.authstate.pw_shell);
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
324 m_free(ses.authstate.pw_passwd);
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
325 m_free(ses.authstate.username);
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
326 #endif
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
327
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
328 cleanup_buf(&ses.session_id);
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
329 cleanup_buf(&ses.hash);
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
330 cleanup_buf(&ses.payload);
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
331 cleanup_buf(&ses.readbuf);
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
332 cleanup_buf(&ses.writepayload);
1041
3fb883a6aa81 Some additional cleanup functions
Matt Johnston <matt@ucc.asn.au>
parents: 1040
diff changeset
333 cleanup_buf(&ses.kexhashbuf);
3fb883a6aa81 Some additional cleanup functions
Matt Johnston <matt@ucc.asn.au>
parents: 1040
diff changeset
334 cleanup_buf(&ses.transkexinit);
3fb883a6aa81 Some additional cleanup functions
Matt Johnston <matt@ucc.asn.au>
parents: 1040
diff changeset
335 if (ses.dh_K) {
3fb883a6aa81 Some additional cleanup functions
Matt Johnston <matt@ucc.asn.au>
parents: 1040
diff changeset
336 mp_clear(ses.dh_K);
3fb883a6aa81 Some additional cleanup functions
Matt Johnston <matt@ucc.asn.au>
parents: 1040
diff changeset
337 }
3fb883a6aa81 Some additional cleanup functions
Matt Johnston <matt@ucc.asn.au>
parents: 1040
diff changeset
338 m_free(ses.dh_K);
1040
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
parents: 1038
diff changeset
339
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
340 m_burn(ses.keys, sizeof(struct key_context));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
341 m_free(ses.keys);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
342
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
343 TRACE(("leave session_cleanup"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
344 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
345
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
346 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
347 buffer *writebuf = buf_new(strlen(LOCAL_IDENT "\r\n") + 1);
1094
c45d65392c1a Fix pointer differ in signess warnings [-Werror=pointer-sign]
Gaël PORTAY <gael.portay@gmail.com>
parents: 1079
diff changeset
348 buf_putbytes(writebuf, (const unsigned char *) LOCAL_IDENT "\r\n", strlen(LOCAL_IDENT "\r\n"));
1577
399d8eb961b5 get rid of unused packet_type in encrypted write queue
Matt Johnston <matt@ucc.asn.au>
parents: 1558
diff changeset
349 writebuf_enqueue(writebuf);
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
350 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
351
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
352 static void read_session_identification() {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
353 /* max length of 255 chars */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
354 char linebuf[256];
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
355 int len = 0;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
356 char done = 0;
103
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
357 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
358 /* 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
359 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
360 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
361
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
362 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
363 /* It failed */
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
364 break;
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
365 }
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
366
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
367 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
368 /* start of line matches */
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
369 done = 1;
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
370 break;
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
371 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
372 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
373
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
374 if (!done) {
1302
6a14b1f6dc04 better TRACE of failed remote ident
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
375 TRACE(("error reading remote ident: %s\n", strerror(errno)))
344
bf29e6659fb9 Just use the normal "remote closed" handler when reading ident stings
Matt Johnston <matt@ucc.asn.au>
parents: 275
diff changeset
376 ses.remoteclosed();
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
377 } else {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
378 /* linebuf is already null terminated */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
379 ses.remoteident = m_malloc(len);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
380 memcpy(ses.remoteident, linebuf, len);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
381 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
382
513
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
383 /* 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
384 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
385 && 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
386 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
387 }
275
7f9adaf85fca Exit with a message if the ssh protocol version is incompatible
Matt Johnston <matt@ucc.asn.au>
parents: 242
diff changeset
388
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
389 TRACE(("remoteident: %s", ses.remoteident))
4
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
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
393 /* 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
394 * or -1 on failure */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
395 static int ident_readln(int fd, char* buf, int count) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
396
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
397 char in;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
398 int pos = 0;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
399 int num = 0;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
400 fd_set fds;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
401 struct timeval timeout;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
402
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
403 TRACE(("enter ident_readln"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
404
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
405 if (count < 1) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
406 return -1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
407 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
408
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
409 FD_ZERO(&fds);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
410
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
411 /* select since it's a non-blocking fd */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
412
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
413 /* leave space to null-terminate */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
414 while (pos < count-1) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
415
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
416 FD_SET(fd, &fds);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
417
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
418 timeout.tv_sec = 1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
419 timeout.tv_usec = 0;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
420 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
421 if (errno == EINTR) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
422 continue;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
423 }
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
424 TRACE(("leave ident_readln: select error"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
425 return -1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
426 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
427
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
428 checktimeouts();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
429
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
430 /* 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
431 * 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
432 * packet reader */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
433 if (FD_ISSET(fd, &fds)) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
434 num = read(fd, &in, 1);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
435 /* 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
436 * 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
437 if (num < 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
438 /* error */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
439 if (errno == EINTR) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
440 continue; /* not a real error */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
441 }
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
442 TRACE(("leave ident_readln: read error"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
443 return -1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
444 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
445 if (num == 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
446 /* 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
447 TRACE(("leave ident_readln: EOF"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
448 return -1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
449 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
450 if (in == '\n') {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
451 /* end of ident string */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
452 break;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
453 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
454 /* we don't want to include '\r's */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
455 if (in != '\r') {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
456 buf[pos] = in;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
457 pos++;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
458 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
459 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
460 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
461
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
462 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
463 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
464 return pos+1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
465 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
466
970
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
467 void ignore_recv_response() {
1038
d3925ed45a85 Fix for old compilers, variable declarations at beginning of functions
Thorsten Horstmann <thorsten.horstmann@web.de>
parents: 1021
diff changeset
468 /* 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
469 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
470 }
f7f6c15b0ec3 Don't send SSH_MSG_UNIMPLEMENTED for keepalive responses
Matt Johnston <matt@ucc.asn.au>
parents: 941
diff changeset
471
939
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
472 static void send_msg_keepalive() {
1038
d3925ed45a85 Fix for old compilers, variable declarations at beginning of functions
Thorsten Horstmann <thorsten.horstmann@web.de>
parents: 1021
diff changeset
473 time_t old_time_idle = ses.last_packet_time_idle;
d3925ed45a85 Fix for old compilers, variable declarations at beginning of functions
Thorsten Horstmann <thorsten.horstmann@web.de>
parents: 1021
diff changeset
474 struct Channel *chan = get_any_ready_channel();
d3925ed45a85 Fix for old compilers, variable declarations at beginning of functions
Thorsten Horstmann <thorsten.horstmann@web.de>
parents: 1021
diff changeset
475
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
476 CHECKCLEARTOWRITE();
970
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
477
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
478 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
479 /* 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
480 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
481 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
482 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
483 } else {
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
484 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
485 /* 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
486 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
487 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
488 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
489 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
490 }
939
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
491 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
492 encrypt_packet();
939
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
493
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
494 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
495
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
496 /* 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
497 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
498 }
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
499
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
500 /* 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
501 * user authentication, and the automatic rekeying. */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
502 static void checktimeouts() {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
503
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
504 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
505 now = monotonic_now();
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
506
1139
43a8ea69b24c Fix problem where auth timeout wasn't checked when waiting for ident
Matt Johnston <matt@ucc.asn.au>
parents: 1124
diff changeset
507 if (IS_DROPBEAR_SERVER && ses.connect_time != 0
43a8ea69b24c Fix problem where auth timeout wasn't checked when waiting for ident
Matt Johnston <matt@ucc.asn.au>
parents: 1124
diff changeset
508 && now - ses.connect_time >= AUTH_TIMEOUT) {
43a8ea69b24c Fix problem where auth timeout wasn't checked when waiting for ident
Matt Johnston <matt@ucc.asn.au>
parents: 1124
diff changeset
509 dropbear_close("Timeout before auth");
43a8ea69b24c Fix problem where auth timeout wasn't checked when waiting for ident
Matt Johnston <matt@ucc.asn.au>
parents: 1124
diff changeset
510 }
43a8ea69b24c Fix problem where auth timeout wasn't checked when waiting for ident
Matt Johnston <matt@ucc.asn.au>
parents: 1124
diff changeset
511
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
512 /* 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
513 if (ses.remoteident == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
514 return;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
515 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
516
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
517 if (!ses.kexstate.sentkexinit
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
518 && (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
519 || 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
520 TRACE(("rekeying after timeout or max data reached"))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
521 send_msg_kexinit();
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
522 }
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
523
970
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 968
diff changeset
524 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
525 /* 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
526 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
527
939
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
528 /* 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
529 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
530 send_msg_keepalive();
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
531 }
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
532
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
533 /* 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
534 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
535 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
536 && 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
537 send_msg_keepalive();
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
538 }
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
539
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
540 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
541 >= 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
542 dropbear_exit("Keepalive timeout");
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
543 }
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
544 }
513
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
545
939
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 929
diff changeset
546 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
547 && 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
548 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
549 }
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
550 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
551
1140
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
552 static void update_timeout(long limit, long now, long last_event, long * timeout) {
1143
924ff1b959a2 only update keepalive timeout post-auth (when keepalives are sent)
Matt Johnston <matt@ucc.asn.au>
parents: 1140
diff changeset
553 TRACE2(("update_timeout limit %ld, now %ld, last %ld, timeout %ld",
1140
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
554 limit, now, last_event, *timeout))
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
555 if (last_event > 0 && limit > 0) {
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
556 *timeout = MIN(*timeout, last_event+limit-now);
1143
924ff1b959a2 only update keepalive timeout post-auth (when keepalives are sent)
Matt Johnston <matt@ucc.asn.au>
parents: 1140
diff changeset
557 TRACE2(("new timeout %ld", *timeout))
1140
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
558 }
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
559 }
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
560
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
561 static long select_timeout() {
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
562 /* 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
563 as to avoid waking when unneccessary */
1310
090033317ca1 Avoid busy loop while waiting for rekey response
Matt Johnston <matt@ucc.asn.au>
parents: 1302
diff changeset
564 long timeout = KEX_REKEY_TIMEOUT;
1140
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
565 long now = monotonic_now();
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
566
1310
090033317ca1 Avoid busy loop while waiting for rekey response
Matt Johnston <matt@ucc.asn.au>
parents: 1302
diff changeset
567 if (!ses.kexstate.sentkexinit) {
090033317ca1 Avoid busy loop while waiting for rekey response
Matt Johnston <matt@ucc.asn.au>
parents: 1302
diff changeset
568 update_timeout(KEX_REKEY_TIMEOUT, now, ses.kexstate.lastkextime, &timeout);
090033317ca1 Avoid busy loop while waiting for rekey response
Matt Johnston <matt@ucc.asn.au>
parents: 1302
diff changeset
569 }
1140
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
570
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
571 if (ses.authstate.authdone != 1 && IS_DROPBEAR_SERVER) {
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
572 /* AUTH_TIMEOUT is only relevant before authdone */
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
573 update_timeout(AUTH_TIMEOUT, now, ses.connect_time, &timeout);
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
574 }
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
575
1143
924ff1b959a2 only update keepalive timeout post-auth (when keepalives are sent)
Matt Johnston <matt@ucc.asn.au>
parents: 1140
diff changeset
576 if (ses.authstate.authdone) {
924ff1b959a2 only update keepalive timeout post-auth (when keepalives are sent)
Matt Johnston <matt@ucc.asn.au>
parents: 1140
diff changeset
577 update_timeout(opts.keepalive_secs, now,
924ff1b959a2 only update keepalive timeout post-auth (when keepalives are sent)
Matt Johnston <matt@ucc.asn.au>
parents: 1140
diff changeset
578 MAX(ses.last_packet_time_keepalive_recv, ses.last_packet_time_keepalive_sent),
924ff1b959a2 only update keepalive timeout post-auth (when keepalives are sent)
Matt Johnston <matt@ucc.asn.au>
parents: 1140
diff changeset
579 &timeout);
924ff1b959a2 only update keepalive timeout post-auth (when keepalives are sent)
Matt Johnston <matt@ucc.asn.au>
parents: 1140
diff changeset
580 }
1140
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
581
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
582 update_timeout(opts.idle_timeout_secs, now, ses.last_packet_time_idle,
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
583 &timeout);
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
584
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
585 /* clamp negative timeouts to zero - event has already triggered */
f6d3a16ecc71 set timeouts to time remaining rather than timeout duration
Matt Johnston <matt@ucc.asn.au>
parents: 1139
diff changeset
586 return MAX(timeout, 0);
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
587 }
482
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
588
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
589 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
590 /* 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
591 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
592 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
593 } else {
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
594 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
595 }
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
596 }
483
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
597 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
598 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
599 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
600 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
601 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
602 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
603 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
604 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
605 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
606 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
607
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
608 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
609 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
610 return;
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
611 }
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
612 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
613 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
614 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
615 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
616 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
617 {
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
618 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
619 #ifdef HAVE_SHADOW_H
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
620 /* 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
621 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
622 if (spasswd && spasswd->sp_pwdp) {
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
623 passwd_crypt = spasswd->sp_pwdp;
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
624 }
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
625 #endif
705
2e573f39b88e Android returns NULL for pw_crypt, set it to something else
Matt Johnston <matt@ucc.asn.au>
parents: 676
diff changeset
626 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
627 /* 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
628 passwd_crypt = "!!";
2e573f39b88e Android returns NULL for pw_crypt, set it to something else
Matt Johnston <matt@ucc.asn.au>
parents: 676
diff changeset
629 }
676
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
630 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
631 }
483
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
632 }
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
633
941
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
634 /* Called when channels are modified */
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
635 void update_channel_prio() {
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
636 enum dropbear_prio new_prio;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
637 int any = 0;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
638 unsigned int i;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
639
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
640 TRACE(("update_channel_prio"))
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
641
1031
64c0aa01e2b6 Update priority once the socket is open
Matt Johnston <matt@ucc.asn.au>
parents: 1025
diff changeset
642 if (ses.sock_out < 0) {
64c0aa01e2b6 Update priority once the socket is open
Matt Johnston <matt@ucc.asn.au>
parents: 1025
diff changeset
643 TRACE(("leave update_channel_prio: no socket"))
64c0aa01e2b6 Update priority once the socket is open
Matt Johnston <matt@ucc.asn.au>
parents: 1025
diff changeset
644 return;
64c0aa01e2b6 Update priority once the socket is open
Matt Johnston <matt@ucc.asn.au>
parents: 1025
diff changeset
645 }
64c0aa01e2b6 Update priority once the socket is open
Matt Johnston <matt@ucc.asn.au>
parents: 1025
diff changeset
646
941
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
647 new_prio = DROPBEAR_PRIO_BULK;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
648 for (i = 0; i < ses.chansize; i++) {
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
649 struct Channel *channel = ses.channels[i];
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
650 if (!channel || channel->prio == DROPBEAR_CHANNEL_PRIO_EARLY) {
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
651 if (channel && channel->prio == DROPBEAR_CHANNEL_PRIO_EARLY) {
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
652 TRACE(("update_channel_prio: early %d", channel->index))
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
653 }
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
654 continue;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
655 }
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
656 any = 1;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
657 if (channel->prio == DROPBEAR_CHANNEL_PRIO_INTERACTIVE)
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
658 {
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
659 TRACE(("update_channel_prio: lowdelay %d", channel->index))
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
660 new_prio = DROPBEAR_PRIO_LOWDELAY;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
661 break;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
662 } else if (channel->prio == DROPBEAR_CHANNEL_PRIO_UNKNOWABLE
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
663 && new_prio == DROPBEAR_PRIO_BULK)
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
664 {
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
665 TRACE(("update_channel_prio: unknowable %d", channel->index))
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
666 new_prio = DROPBEAR_PRIO_DEFAULT;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
667 }
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
668 }
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
669
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
670 if (any == 0) {
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
671 /* lowdelay during setup */
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
672 TRACE(("update_channel_prio: not any"))
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
673 new_prio = DROPBEAR_PRIO_LOWDELAY;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
674 }
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
675
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
676 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
677 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
678 set_sock_priority(ses.sock_out, new_prio);
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
679 ses.socket_prio = new_prio;
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
680 }
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
681 }
5daedffd0769 Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents: 940
diff changeset
682