annotate cli-session.c @ 822:32862e8283e7

Version 2013.59
author Matt Johnston <matt@ucc.asn.au>
date Fri, 04 Oct 2013 21:41:19 +0800
parents 2400b8685762
children 7dcb46da72d9
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1 /*
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2 * Dropbear SSH
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * Copyright (c) 2004 by Mihnea Stoenescu
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6 * All rights reserved.
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7 *
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8 * Permission is hereby granted, free of charge, to any person obtaining a copy
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9 * of this software and associated documentation files (the "Software"), to deal
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10 * in the Software without restriction, including without limitation the rights
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11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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12 * copies of the Software, and to permit persons to whom the Software is
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13 * furnished to do so, subject to the following conditions:
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14 *
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15 * The above copyright notice and this permission notice shall be included in
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16 * all copies or substantial portions of the Software.
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17 *
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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24 * SOFTWARE. */
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25
26
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26 #include "includes.h"
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27 #include "session.h"
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28 #include "dbutil.h"
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29 #include "kex.h"
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30 #include "ssh.h"
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31 #include "packet.h"
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32 #include "tcpfwd.h"
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33 #include "channel.h"
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34 #include "random.h"
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35 #include "service.h"
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36 #include "runopts.h"
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37 #include "chansession.h"
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38 #include "agentfwd.h"
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39
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40 static void cli_remoteclosed();
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41 static void cli_sessionloop();
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42 static void cli_session_init();
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43 static void cli_finished();
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44 static void recv_msg_service_accept(void);
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45 static void cli_session_cleanup(void);
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46
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47 struct clientsession cli_ses; /* GLOBAL */
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48
45
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49 /* Sorted in decreasing frequency will be more efficient - data and window
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50 * should be first */
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51 static const packettype cli_packettypes[] = {
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52 /* TYPE, FUNCTION */
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53 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data},
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54 {SSH_MSG_CHANNEL_EXTENDED_DATA, recv_msg_channel_extended_data},
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55 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust},
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56 {SSH_MSG_USERAUTH_FAILURE, recv_msg_userauth_failure}, /* client */
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57 {SSH_MSG_USERAUTH_SUCCESS, recv_msg_userauth_success}, /* client */
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58 {SSH_MSG_KEXINIT, recv_msg_kexinit},
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59 {SSH_MSG_KEXDH_REPLY, recv_msg_kexdh_reply}, /* client */
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60 {SSH_MSG_NEWKEYS, recv_msg_newkeys},
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61 {SSH_MSG_SERVICE_ACCEPT, recv_msg_service_accept}, /* client */
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62 {SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request},
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63 {SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open},
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64 {SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof},
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65 {SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close},
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66 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation},
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67 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure},
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68 {SSH_MSG_USERAUTH_BANNER, recv_msg_userauth_banner}, /* client */
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69 {SSH_MSG_USERAUTH_SPECIFIC_60, recv_msg_userauth_specific_60}, /* client */
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70 #ifdef ENABLE_CLI_REMOTETCPFWD
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71 {SSH_MSG_REQUEST_SUCCESS, cli_recv_msg_request_success}, /* client */
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72 {SSH_MSG_REQUEST_FAILURE, cli_recv_msg_request_failure}, /* client */
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73 #endif
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74 {0, 0} /* End */
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75 };
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76
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77 static const struct ChanType *cli_chantypes[] = {
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78 #ifdef ENABLE_CLI_REMOTETCPFWD
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79 &cli_chan_tcpremote,
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80 #endif
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81 #ifdef ENABLE_CLI_AGENTFWD
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82 &cli_chan_agent,
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83 #endif
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84 NULL /* Null termination */
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85 };
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86
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87 void cli_session(int sock_in, int sock_out) {
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88
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89 seedrandom();
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90
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91 crypto_init();
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92
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93 common_session_init(sock_in, sock_out);
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94
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95 chaninitialise(cli_chantypes);
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96
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97 /* Set up cli_ses vars */
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98 cli_session_init();
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99
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100 /* Ready to go */
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101 sessinitdone = 1;
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102
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103 /* Exchange identification */
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104 send_session_identification();
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105
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106 send_msg_kexinit();
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107
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108 session_loop(cli_sessionloop);
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109
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110 /* Not reached */
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111
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112 }
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113
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114 #ifdef USE_KEX_FIRST_FOLLOWS
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115 static void cli_send_kex_first_guess() {
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116 send_msg_kexdh_init();
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117 }
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118 #endif
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119
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120 static void cli_session_init() {
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121
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122 cli_ses.state = STATE_NOTHING;
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123 cli_ses.kex_state = KEX_NOTHING;
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124
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125 cli_ses.tty_raw_mode = 0;
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126 cli_ses.winchange = 0;
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127
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128 /* We store std{in,out,err}'s flags, so we can set them back on exit
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129 * (otherwise busybox's ash isn't happy */
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130 cli_ses.stdincopy = dup(STDIN_FILENO);
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131 cli_ses.stdinflags = fcntl(STDIN_FILENO, F_GETFL, 0);
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132 cli_ses.stdoutcopy = dup(STDOUT_FILENO);
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133 cli_ses.stdoutflags = fcntl(STDOUT_FILENO, F_GETFL, 0);
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134 cli_ses.stderrcopy = dup(STDERR_FILENO);
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135 cli_ses.stderrflags = fcntl(STDERR_FILENO, F_GETFL, 0);
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136
108
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137 cli_ses.retval = EXIT_SUCCESS; /* Assume it's clean if we don't get a
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138 specific exit status */
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139
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140 /* Auth */
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141 cli_ses.lastprivkey = NULL;
136
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parents: 108
diff changeset
142 cli_ses.lastauthtype = 0;
47
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 45
diff changeset
143
686
983a817f8e41 - Only request "none" cipher after auth has succeeded
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parents: 594
diff changeset
144 #ifdef DROPBEAR_NONE_CIPHER
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
145 cli_ses.cipher_none_after_auth = get_algo_usable(sshciphers, "none");
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
146 set_algo_usable(sshciphers, "none", 0);
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
147 #else
983a817f8e41 - Only request "none" cipher after auth has succeeded
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parents: 594
diff changeset
148 cli_ses.cipher_none_after_auth = 0;
983a817f8e41 - Only request "none" cipher after auth has succeeded
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parents: 594
diff changeset
149 #endif
983a817f8e41 - Only request "none" cipher after auth has succeeded
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parents: 594
diff changeset
150
33
f789045062e6 Progressing client support
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parents: 26
diff changeset
151 /* For printing "remote host closed" for the user */
f789045062e6 Progressing client support
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parents: 26
diff changeset
152 ses.remoteclosed = cli_remoteclosed;
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parents: 26
diff changeset
153
733
70811267715c Run the cleanup handler also when we close due to TCP connection being closed
Matt Johnston <matt@ucc.asn.au>
parents: 731
diff changeset
154 ses.extra_session_cleanup = cli_session_cleanup;
33
f789045062e6 Progressing client support
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parents: 26
diff changeset
155
f789045062e6 Progressing client support
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parents: 26
diff changeset
156 /* packet handlers */
f789045062e6 Progressing client support
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parents: 26
diff changeset
157 ses.packettypes = cli_packettypes;
35
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
158
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
159 ses.isserver = 0;
739
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 686
diff changeset
160
746
465fefc4f6e0 Put some #ifdef options around first-follows options in case they
Matt Johnston <matt@ucc.asn.au>
parents: 745
diff changeset
161 #ifdef USE_KEX_FIRST_FOLLOWS
739
d44325108d0e first_kex_packet_follows working, needs tidying
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parents: 686
diff changeset
162 ses.send_kex_first_guess = cli_send_kex_first_guess;
746
465fefc4f6e0 Put some #ifdef options around first-follows options in case they
Matt Johnston <matt@ucc.asn.au>
parents: 745
diff changeset
163 #endif
739
d44325108d0e first_kex_packet_follows working, needs tidying
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parents: 686
diff changeset
164
26
0969767bca0d snapshot of stuff
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parents:
diff changeset
165 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166
727
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
167 static void send_msg_service_request(char* servicename) {
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
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parents: 726
diff changeset
168
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
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parents: 726
diff changeset
169 TRACE(("enter send_msg_service_request: servicename='%s'", servicename))
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
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parents: 726
diff changeset
170
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
171 CHECKCLEARTOWRITE();
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
172
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
173 buf_putbyte(ses.writepayload, SSH_MSG_SERVICE_REQUEST);
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
174 buf_putstring(ses.writepayload, servicename, strlen(servicename));
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
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parents: 726
diff changeset
175
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
176 encrypt_packet();
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
177 TRACE(("leave send_msg_service_request"))
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
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parents: 726
diff changeset
178 }
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
179
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
180 static void recv_msg_service_accept(void) {
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
181 // do nothing, if it failed then the server MUST have disconnected
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
182 }
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
183
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
184 /* This function drives the progress of the session - it initiates KEX,
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
185 * service, userauth and channel requests */
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
186 static void cli_sessionloop() {
0969767bca0d snapshot of stuff
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parents:
diff changeset
187
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 727
diff changeset
188 TRACE2(("enter cli_sessionloop"))
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
189
745
15999b098cc9 Don't usually need to recalculate dh_e for the repeated kexdh_init packet
Matt Johnston <matt@ucc.asn.au>
parents: 743
diff changeset
190 if (ses.lastpacket == 0) {
15999b098cc9 Don't usually need to recalculate dh_e for the repeated kexdh_init packet
Matt Johnston <matt@ucc.asn.au>
parents: 743
diff changeset
191 TRACE2(("exit cli_sessionloop: no real packets yet"))
15999b098cc9 Don't usually need to recalculate dh_e for the repeated kexdh_init packet
Matt Johnston <matt@ucc.asn.au>
parents: 743
diff changeset
192 return;
15999b098cc9 Don't usually need to recalculate dh_e for the repeated kexdh_init packet
Matt Johnston <matt@ucc.asn.au>
parents: 743
diff changeset
193 }
15999b098cc9 Don't usually need to recalculate dh_e for the repeated kexdh_init packet
Matt Johnston <matt@ucc.asn.au>
parents: 743
diff changeset
194
34
e2a1eaa19f22 Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
195 if (ses.lastpacket == SSH_MSG_KEXINIT && cli_ses.kex_state == KEX_NOTHING) {
33
f789045062e6 Progressing client support
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parents: 26
diff changeset
196 /* We initiate the KEXDH. If DH wasn't the correct type, the KEXINIT
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
197 * negotiation would have failed. */
739
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 686
diff changeset
198 if (!ses.kexstate.our_first_follows_matches) {
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 686
diff changeset
199 send_msg_kexdh_init();
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 686
diff changeset
200 }
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 686
diff changeset
201 cli_ses.kex_state = KEXDH_INIT_SENT;
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 136
diff changeset
202 TRACE(("leave cli_sessionloop: done with KEXINIT_RCVD"))
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
203 return;
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
204 }
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
205
f789045062e6 Progressing client support
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parents: 26
diff changeset
206 /* A KEX has finished, so we should go back to our KEX_NOTHING state */
753
d63ef1e211ea Take transmit and receive keys into use separately
Matt Johnston <matt@ucc.asn.au>
parents: 750
diff changeset
207 if (cli_ses.kex_state != KEX_NOTHING && ses.kexstate.sentnewkeys) {
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
208 cli_ses.kex_state = KEX_NOTHING;
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
209 }
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
210
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
211 /* We shouldn't do anything else if a KEX is in progress */
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
212 if (cli_ses.kex_state != KEX_NOTHING) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 136
diff changeset
213 TRACE(("leave cli_sessionloop: kex_state != KEX_NOTHING"))
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
214 return;
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
215 }
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
216
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
217 if (ses.kexstate.donefirstkex == 0) {
745
15999b098cc9 Don't usually need to recalculate dh_e for the repeated kexdh_init packet
Matt Johnston <matt@ucc.asn.au>
parents: 743
diff changeset
218 /* We might reach here if we have partial packet reads or have
15999b098cc9 Don't usually need to recalculate dh_e for the repeated kexdh_init packet
Matt Johnston <matt@ucc.asn.au>
parents: 743
diff changeset
219 * received SSG_MSG_IGNORE etc. Just skip it */
753
d63ef1e211ea Take transmit and receive keys into use separately
Matt Johnston <matt@ucc.asn.au>
parents: 750
diff changeset
220 TRACE2(("donefirstkex false\n"))
34
e2a1eaa19f22 Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
221 return;
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
222 }
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
223
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224 switch (cli_ses.state) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
225
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
226 case STATE_NOTHING:
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
227 /* We've got the transport layer sorted, we now need to request
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
228 * userauth */
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
229 send_msg_service_request(SSH_SERVICE_USERAUTH);
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
230 cli_auth_getmethods();
45
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
Matt Johnston <matt@ucc.asn.au>
parents: 43
diff changeset
231 cli_ses.state = USERAUTH_REQ_SENT;
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 136
diff changeset
232 TRACE(("leave cli_sessionloop: sent userauth methods req"))
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
233 return;
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
234
f789045062e6 Progressing client support
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parents: 26
diff changeset
235 case USERAUTH_FAIL_RCVD:
734
619b1ed837fd Be a bit more careful about when we want to use CLI_AUTH_IMMEDIATE
Matt Johnston <matt@ucc.asn.au>
parents: 733
diff changeset
236 if (cli_auth_try() == DROPBEAR_FAILURE) {
619b1ed837fd Be a bit more careful about when we want to use CLI_AUTH_IMMEDIATE
Matt Johnston <matt@ucc.asn.au>
parents: 733
diff changeset
237 dropbear_exit("No auth methods could be used.");
619b1ed837fd Be a bit more careful about when we want to use CLI_AUTH_IMMEDIATE
Matt Johnston <matt@ucc.asn.au>
parents: 733
diff changeset
238 }
45
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
Matt Johnston <matt@ucc.asn.au>
parents: 43
diff changeset
239 cli_ses.state = USERAUTH_REQ_SENT;
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 136
diff changeset
240 TRACE(("leave cli_sessionloop: cli_auth_try"))
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
241 return;
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
242
37
0913e2ee3545 we're nearly there yet
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
243 case USERAUTH_SUCCESS_RCVD:
326
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
244
686
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
245 #ifdef DROPBEAR_NONE_CIPHER
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
246 if (cli_ses.cipher_none_after_auth)
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
247 {
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
248 set_algo_usable(sshciphers, "none", 1);
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
249 send_msg_kexinit();
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
250 }
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
251 #endif
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
252
326
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
253 if (cli_opts.backgrounded) {
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
254 int devnull;
433
c216212001fc Fix for -pedantic -ansi compilation, change // to /**/, plus some signedness
Matt Johnston <matt@ucc.asn.au>
parents: 326
diff changeset
255 /* keeping stdin open steals input from the terminal and
c216212001fc Fix for -pedantic -ansi compilation, change // to /**/, plus some signedness
Matt Johnston <matt@ucc.asn.au>
parents: 326
diff changeset
256 is confusing, though stdout/stderr could be useful. */
326
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
257 devnull = open(_PATH_DEVNULL, O_RDONLY);
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
258 if (devnull < 0) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
259 dropbear_exit("Opening /dev/null: %d %s",
326
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
260 errno, strerror(errno));
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
261 }
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
262 dup2(devnull, STDIN_FILENO);
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
263 if (daemon(0, 1) < 0) {
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
264 dropbear_exit("Backgrounding failed: %d %s",
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
265 errno, strerror(errno));
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
266 }
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
267 }
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
268
485
12d845ab7b5f Rework netcat-alike to be a proper mode, with -B argument.
Matt Johnston <matt@ucc.asn.au>
parents: 478
diff changeset
269 #ifdef ENABLE_CLI_NETCAT
12d845ab7b5f Rework netcat-alike to be a proper mode, with -B argument.
Matt Johnston <matt@ucc.asn.au>
parents: 478
diff changeset
270 if (cli_opts.netcat_host) {
12d845ab7b5f Rework netcat-alike to be a proper mode, with -B argument.
Matt Johnston <matt@ucc.asn.au>
parents: 478
diff changeset
271 cli_send_netcat_request();
12d845ab7b5f Rework netcat-alike to be a proper mode, with -B argument.
Matt Johnston <matt@ucc.asn.au>
parents: 478
diff changeset
272 } else
12d845ab7b5f Rework netcat-alike to be a proper mode, with -B argument.
Matt Johnston <matt@ucc.asn.au>
parents: 478
diff changeset
273 #endif
560
52d7301e46bd Agent forwarding works
Matt Johnston <matt@ucc.asn.au>
parents: 547
diff changeset
274 if (!cli_opts.no_cmd) {
325
0e4f225b7e07 Add -N "no remote command" dbclient option.
Matt Johnston <matt@ucc.asn.au>
parents: 272
diff changeset
275 cli_send_chansess_request();
0e4f225b7e07 Add -N "no remote command" dbclient option.
Matt Johnston <matt@ucc.asn.au>
parents: 272
diff changeset
276 }
754
2400b8685762 setup tcp after requesting a channel - might hide some DNS latency
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
277
2400b8685762 setup tcp after requesting a channel - might hide some DNS latency
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
278 #ifdef ENABLE_CLI_LOCALTCPFWD
2400b8685762 setup tcp after requesting a channel - might hide some DNS latency
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
279 setup_localtcp();
2400b8685762 setup tcp after requesting a channel - might hide some DNS latency
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
280 #endif
2400b8685762 setup tcp after requesting a channel - might hide some DNS latency
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
281 #ifdef ENABLE_CLI_REMOTETCPFWD
2400b8685762 setup tcp after requesting a channel - might hide some DNS latency
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
282 setup_remotetcp();
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283 #endif
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284
325
0e4f225b7e07 Add -N "no remote command" dbclient option.
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285 TRACE(("leave cli_sessionloop: running"))
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286 cli_ses.state = SESSION_RUNNING;
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287 return;
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288
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289 case SESSION_RUNNING:
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290 if (ses.chancount < 1 && !cli_opts.no_cmd) {
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291 cli_finished();
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292 }
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293
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294 if (cli_ses.winchange) {
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295 cli_chansess_winchange();
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296 }
40
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297 return;
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298
33
f789045062e6 Progressing client support
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299 /* XXX more here needed */
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300
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301
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302 default:
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303 break;
26
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304 }
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305
731
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306 TRACE2(("leave cli_sessionloop: fell out"))
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307
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308 }
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309
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310 static void cli_session_cleanup(void) {
40
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311
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312 if (!sessinitdone) {
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313 return;
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314 }
99
0247fbd9379d Move the revert-to-non-blocking-stdin code to cli-session so it
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315
175
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316 /* Set std{in,out,err} back to non-blocking - busybox ash dies nastily if
2c5741e4b855 * Reset the non-blocking status of stdout and stderr as well on exit
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317 * we don't revert the flags */
100
c72f5c10125d oops, the fcntl() was commented out
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318 fcntl(cli_ses.stdincopy, F_SETFL, cli_ses.stdinflags);
175
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319 fcntl(cli_ses.stdoutcopy, F_SETFL, cli_ses.stdoutflags);
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320 fcntl(cli_ses.stderrcopy, F_SETFL, cli_ses.stderrflags);
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321
40
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322 cli_tty_cleanup();
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323
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diff changeset
324 }
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325
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diff changeset
326 static void cli_finished() {
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327
733
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328 session_cleanup();
40
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diff changeset
329 fprintf(stderr, "Connection to %s@%s:%s closed.\n", cli_opts.username,
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330 cli_opts.remotehost, cli_opts.remoteport);
108
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331 exit(cli_ses.retval);
40
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332 }
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diff changeset
333
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334
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335 /* called when the remote side closes the connection */
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diff changeset
336 static void cli_remoteclosed() {
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337
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338 /* XXX TODO perhaps print a friendlier message if we get this but have
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339 * already sent/received disconnect message(s) ??? */
479
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
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parents: 433
diff changeset
340 m_close(ses.sock_in);
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parents: 433
diff changeset
341 m_close(ses.sock_out);
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diff changeset
342 ses.sock_in = -1;
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parents: 433
diff changeset
343 ses.sock_out = -1;
594
a98a2138364a Improve capitalisation for all logged strings
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parents: 568
diff changeset
344 dropbear_exit("Remote closed the connection");
26
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345 }
43
942b22d7dd1c Banner printing
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diff changeset
346
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diff changeset
347 /* Operates in-place turning dirty (untrusted potentially containing control
249
efbaf6b03837 added keyboard-interactive client support
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diff changeset
348 * characters) text into clean text.
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diff changeset
349 * Note: this is safe only with ascii - other charsets could have problems. */
43
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diff changeset
350 void cleantext(unsigned char* dirtytext) {
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diff changeset
351
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diff changeset
352 unsigned int i, j;
47
4b53a43f0082 - client pubkey auth works
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diff changeset
353 unsigned char c;
43
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diff changeset
354
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diff changeset
355 j = 0;
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diff changeset
356 for (i = 0; dirtytext[i] != '\0'; i++) {
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357
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diff changeset
358 c = dirtytext[i];
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diff changeset
359 /* We can ignore '\r's */
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360 if ( (c >= ' ' && c <= '~') || c == '\n' || c == '\t') {
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parents: 41
diff changeset
361 dirtytext[j] = c;
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diff changeset
362 j++;
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363 }
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364 }
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diff changeset
365 /* Null terminate */
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diff changeset
366 dirtytext[j] = '\0';
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diff changeset
367 }