Mercurial > dropbear

annotate cli-session.c @ 932:3873b39c4de6

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Print errno information in write_packet
author Ronny Meeus <ronny.meeus@gmail.com>
date Tue, 20 May 2014 20:56:59 +0800
parents ff597bf2cfb0
children bae0b34bc059 4ad38e223ccd
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74
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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 "dbrandom.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 #include "crypto_desc.h"
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40
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41 static void cli_remoteclosed();
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42 static void cli_sessionloop();
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43 static void cli_session_init();
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44 static void cli_finished();
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45 static void recv_msg_service_accept(void);
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46 static void cli_session_cleanup(void);
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47
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48 struct clientsession cli_ses; /* GLOBAL */
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49
45
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50 /* Sorted in decreasing frequency will be more efficient - data and window
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51 * should be first */
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52 static const packettype cli_packettypes[] = {
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53 /* TYPE, FUNCTION */
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54 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data},
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55 {SSH_MSG_CHANNEL_EXTENDED_DATA, recv_msg_channel_extended_data},
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56 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust},
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57 {SSH_MSG_USERAUTH_FAILURE, recv_msg_userauth_failure}, /* client */
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58 {SSH_MSG_USERAUTH_SUCCESS, recv_msg_userauth_success}, /* client */
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59 {SSH_MSG_KEXINIT, recv_msg_kexinit},
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60 {SSH_MSG_KEXDH_REPLY, recv_msg_kexdh_reply}, /* client */
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61 {SSH_MSG_NEWKEYS, recv_msg_newkeys},
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62 {SSH_MSG_SERVICE_ACCEPT, recv_msg_service_accept}, /* client */
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63 {SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request},
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64 {SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open},
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65 {SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof},
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66 {SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close},
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67 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation},
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68 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure},
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69 {SSH_MSG_USERAUTH_BANNER, recv_msg_userauth_banner}, /* client */
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70 {SSH_MSG_USERAUTH_SPECIFIC_60, recv_msg_userauth_specific_60}, /* client */
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71 #ifdef ENABLE_CLI_REMOTETCPFWD
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72 {SSH_MSG_REQUEST_SUCCESS, cli_recv_msg_request_success}, /* client */
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73 {SSH_MSG_REQUEST_FAILURE, cli_recv_msg_request_failure}, /* client */
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74 #endif
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75 {0, 0} /* End */
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76 };
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77
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78 static const struct ChanType *cli_chantypes[] = {
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79 #ifdef ENABLE_CLI_REMOTETCPFWD
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80 &cli_chan_tcpremote,
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81 #endif
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82 #ifdef ENABLE_CLI_AGENTFWD
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83 &cli_chan_agent,
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84 #endif
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85 NULL /* Null termination */
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86 };
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87
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88 void cli_session(int sock_in, int sock_out) {
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89
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90 common_session_init(sock_in, sock_out);
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91
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92 chaninitialise(cli_chantypes);
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93
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94 /* Set up cli_ses vars */
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95 cli_session_init();
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96
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97 /* Ready to go */
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98 sessinitdone = 1;
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99
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100 /* Exchange identification */
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101 send_session_identification();
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102
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103 send_msg_kexinit();
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104
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105 session_loop(cli_sessionloop);
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106
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107 /* Not reached */
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108
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109 }
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110
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111 #ifdef USE_KEX_FIRST_FOLLOWS
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112 static void cli_send_kex_first_guess() {
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113 send_msg_kexdh_init();
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114 }
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115 #endif
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116
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117 static void cli_session_init() {
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118
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119 cli_ses.state = STATE_NOTHING;
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120 cli_ses.kex_state = KEX_NOTHING;
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121
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122 cli_ses.tty_raw_mode = 0;
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123 cli_ses.winchange = 0;
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124
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125 /* We store std{in,out,err}'s flags, so we can set them back on exit
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126 * (otherwise busybox's ash isn't happy */
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127 cli_ses.stdincopy = dup(STDIN_FILENO);
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128 cli_ses.stdinflags = fcntl(STDIN_FILENO, F_GETFL, 0);
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129 cli_ses.stdoutcopy = dup(STDOUT_FILENO);
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130 cli_ses.stdoutflags = fcntl(STDOUT_FILENO, F_GETFL, 0);
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131 cli_ses.stderrcopy = dup(STDERR_FILENO);
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132 cli_ses.stderrflags = fcntl(STDERR_FILENO, F_GETFL, 0);
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133
108
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134 cli_ses.retval = EXIT_SUCCESS; /* Assume it's clean if we don't get a
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135 specific exit status */
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136
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137 /* Auth */
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138 cli_ses.lastprivkey = NULL;
136
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139 cli_ses.lastauthtype = 0;
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diff changeset
140
686
983a817f8e41 - Only request "none" cipher after auth has succeeded
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parents: 594
diff changeset
141 #ifdef DROPBEAR_NONE_CIPHER
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
142 cli_ses.cipher_none_after_auth = get_algo_usable(sshciphers, "none");
983a817f8e41 - Only request "none" cipher after auth has succeeded
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parents: 594
diff changeset
143 set_algo_usable(sshciphers, "none", 0);
983a817f8e41 - Only request "none" cipher after auth has succeeded
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parents: 594
diff changeset
144 #else
983a817f8e41 - Only request "none" cipher after auth has succeeded
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parents: 594
diff changeset
145 cli_ses.cipher_none_after_auth = 0;
983a817f8e41 - Only request "none" cipher after auth has succeeded
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parents: 594
diff changeset
146 #endif
983a817f8e41 - Only request "none" cipher after auth has succeeded
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parents: 594
diff changeset
147
33
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parents: 26
diff changeset
148 /* For printing "remote host closed" for the user */
f789045062e6 Progressing client support
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parents: 26
diff changeset
149 ses.remoteclosed = cli_remoteclosed;
f789045062e6 Progressing client support
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parents: 26
diff changeset
150
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
151 ses.extra_session_cleanup = cli_session_cleanup;
33
f789045062e6 Progressing client support
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parents: 26
diff changeset
152
f789045062e6 Progressing client support
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parents: 26
diff changeset
153 /* packet handlers */
f789045062e6 Progressing client support
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parents: 26
diff changeset
154 ses.packettypes = cli_packettypes;
35
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
155
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
156 ses.isserver = 0;
739
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 686
diff changeset
157
746
465fefc4f6e0 Put some #ifdef options around first-follows options in case they
Matt Johnston <matt@ucc.asn.au>
parents: 745
diff changeset
158 #ifdef USE_KEX_FIRST_FOLLOWS
739
d44325108d0e first_kex_packet_follows working, needs tidying
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parents: 686
diff changeset
159 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
160 #endif
739
d44325108d0e first_kex_packet_follows working, needs tidying
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parents: 686
diff changeset
161
26
0969767bca0d snapshot of stuff
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parents:
diff changeset
162 }
0969767bca0d snapshot of stuff
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parents:
diff changeset
163
727
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
164 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
165
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
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parents: 726
diff changeset
166 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
167
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
168 CHECKCLEARTOWRITE();
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
169
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
170 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
171 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
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 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
174 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
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
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
177 static void recv_msg_service_accept(void) {
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
178 /* do nothing, if it failed then the server MUST have disconnected */
727
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
33
f789045062e6 Progressing client support
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parents: 26
diff changeset
181 /* 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
182 * service, userauth and channel requests */
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
183 static void cli_sessionloop() {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
184
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 727
diff changeset
185 TRACE2(("enter cli_sessionloop"))
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
186
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
187 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
188 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
189 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
190 }
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
34
e2a1eaa19f22 Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
192 if (ses.lastpacket == SSH_MSG_KEXINIT && cli_ses.kex_state == KEX_NOTHING) {
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
193 /* 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
194 * negotiation would have failed. */
739
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 686
diff changeset
195 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
196 send_msg_kexdh_init();
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 686
diff changeset
197 }
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 686
diff changeset
198 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
199 TRACE(("leave cli_sessionloop: done with KEXINIT_RCVD"))
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
200 return;
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
201 }
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
202
f789045062e6 Progressing client support
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parents: 26
diff changeset
203 /* 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
204 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
205 cli_ses.kex_state = KEX_NOTHING;
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
206 }
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
207
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
208 /* 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
209 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
210 TRACE(("leave cli_sessionloop: kex_state != KEX_NOTHING"))
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
211 return;
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
212 }
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
213
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
214 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
215 /* 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
216 * 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
217 TRACE2(("donefirstkex false\n"))
34
e2a1eaa19f22 Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
218 return;
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
219 }
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
220
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221 switch (cli_ses.state) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
223 case STATE_NOTHING:
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
224 /* 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
225 * userauth */
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
226 send_msg_service_request(SSH_SERVICE_USERAUTH);
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
227 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
228 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
229 TRACE(("leave cli_sessionloop: sent userauth methods req"))
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
230 return;
883
ff597bf2cfb0 DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
231
ff597bf2cfb0 DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
232 case USERAUTH_REQ_SENT:
ff597bf2cfb0 DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
233 TRACE(("leave cli_sessionloop: waiting, req_sent"))
ff597bf2cfb0 DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
234 return;
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
235
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
236 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
237 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
238 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
239 }
45
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
Matt Johnston <matt@ucc.asn.au>
parents: 43
diff changeset
240 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
241 TRACE(("leave cli_sessionloop: cli_auth_try"))
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
242 return;
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
243
37
0913e2ee3545 we're nearly there yet
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
244 case USERAUTH_SUCCESS_RCVD:
326
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
245
686
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
246 #ifdef DROPBEAR_NONE_CIPHER
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
247 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
248 {
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
249 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
250 send_msg_kexinit();
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
251 }
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
252 #endif
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
253
326
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
254 if (cli_opts.backgrounded) {
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
255 int devnull;
433
c216212001fc Fix for -pedantic -ansi compilation, change // to /**/, plus some signedness
Matt Johnston <matt@ucc.asn.au>
parents: 326
diff changeset
256 /* 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
257 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
258 devnull = open(_PATH_DEVNULL, O_RDONLY);
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
259 if (devnull < 0) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
260 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
261 errno, strerror(errno));
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
262 }
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
263 dup2(devnull, STDIN_FILENO);
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
264 if (daemon(0, 1) < 0) {
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
265 dropbear_exit("Backgrounding failed: %d %s",
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
266 errno, strerror(errno));
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 }
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
269
485
12d845ab7b5f Rework netcat-alike to be a proper mode, with -B argument.
Matt Johnston <matt@ucc.asn.au>
parents: 478
diff changeset
270 #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
271 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
272 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
273 } else
12d845ab7b5f Rework netcat-alike to be a proper mode, with -B argument.
Matt Johnston <matt@ucc.asn.au>
parents: 478
diff changeset
274 #endif
560
52d7301e46bd Agent forwarding works
Matt Johnston <matt@ucc.asn.au>
parents: 547
diff changeset
275 if (!cli_opts.no_cmd) {
325
0e4f225b7e07 Add -N "no remote command" dbclient option.
Matt Johnston <matt@ucc.asn.au>
parents: 272
diff changeset
276 cli_send_chansess_request();
0e4f225b7e07 Add -N "no remote command" dbclient option.
Matt Johnston <matt@ucc.asn.au>
parents: 272
diff changeset
277 }
754
2400b8685762 setup tcp after requesting a channel - might hide some DNS latency
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
278
2400b8685762 setup tcp after requesting a channel - might hide some DNS latency
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
279 #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
280 setup_localtcp();
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281 #endif
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282 #ifdef ENABLE_CLI_REMOTETCPFWD
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283 setup_remotetcp();
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284 #endif
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285
325
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286 TRACE(("leave cli_sessionloop: running"))
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287 cli_ses.state = SESSION_RUNNING;
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288 return;
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289
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290 case SESSION_RUNNING:
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291 if (ses.chancount < 1 && !cli_opts.no_cmd) {
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292 cli_finished();
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293 }
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294
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295 if (cli_ses.winchange) {
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296 cli_chansess_winchange();
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297 }
40
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298 return;
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299
33
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300 /* XXX more here needed */
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301
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302
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303 default:
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304 break;
26
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305 }
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306
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307 TRACE2(("leave cli_sessionloop: fell out"))
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308
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309 }
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310
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311 static void cli_session_cleanup(void) {
40
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312
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313 if (!sessinitdone) {
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314 return;
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315 }
99
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316
175
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317 /* Set std{in,out,err} back to non-blocking - busybox ash dies nastily if
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318 * we don't revert the flags */
100
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319 fcntl(cli_ses.stdincopy, F_SETFL, cli_ses.stdinflags);
175
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320 fcntl(cli_ses.stdoutcopy, F_SETFL, cli_ses.stdoutflags);
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321 fcntl(cli_ses.stderrcopy, F_SETFL, cli_ses.stderrflags);
99
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322
40
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323 cli_tty_cleanup();
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324
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325 }
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326
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327 static void cli_finished() {
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328
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329 session_cleanup();
40
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330 fprintf(stderr, "Connection to %s@%s:%s closed.\n", cli_opts.username,
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331 cli_opts.remotehost, cli_opts.remoteport);
108
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332 exit(cli_ses.retval);
40
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333 }
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334
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335
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336 /* called when the remote side closes the connection */
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337 static void cli_remoteclosed() {
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338
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339 /* XXX TODO perhaps print a friendlier message if we get this but have
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340 * already sent/received disconnect message(s) ??? */
479
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341 m_close(ses.sock_in);
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342 m_close(ses.sock_out);
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diff changeset
343 ses.sock_in = -1;
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diff changeset
344 ses.sock_out = -1;
594
a98a2138364a Improve capitalisation for all logged strings
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345 dropbear_exit("Remote closed the connection");
26
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346 }
43
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diff changeset
347
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348 /* Operates in-place turning dirty (untrusted potentially containing control
249
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diff changeset
349 * characters) text into clean text.
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350 * Note: this is safe only with ascii - other charsets could have problems. */
43
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351 void cleantext(unsigned char* dirtytext) {
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352
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diff changeset
353 unsigned int i, j;
47
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diff changeset
354 unsigned char c;
43
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355
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356 j = 0;
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357 for (i = 0; dirtytext[i] != '\0'; i++) {
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358
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359 c = dirtytext[i];
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360 /* We can ignore '\r's */
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361 if ( (c >= ' ' && c <= '~') || c == '\n' || c == '\t') {
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diff changeset
362 dirtytext[j] = c;
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diff changeset
363 j++;
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364 }
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365 }
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366 /* Null terminate */
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diff changeset
367 dirtytext[j] = '\0';
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368 }