annotate cli-session.c @ 1069:2fa71c3b2827 pam

merge pam branch up to date
author Matt Johnston <matt@ucc.asn.au>
date Mon, 16 Mar 2015 21:34:05 +0800
parents 73ea0dce9a57 01eea88963f3
children 16379795f80b
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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 #include "netio.h"
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41
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42 static void cli_remoteclosed() ATTRIB_NORETURN;
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43 static void cli_sessionloop();
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44 static void cli_session_init();
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45 static void cli_finished() ATTRIB_NORETURN;
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46 static void recv_msg_service_accept(void);
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47 static void cli_session_cleanup(void);
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48 static void recv_msg_global_request_cli(void);
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49
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50 struct clientsession cli_ses; /* GLOBAL */
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51
45
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52 /* Sorted in decreasing frequency will be more efficient - data and window
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53 * should be first */
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54 static const packettype cli_packettypes[] = {
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55 /* TYPE, FUNCTION */
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56 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data},
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57 {SSH_MSG_CHANNEL_EXTENDED_DATA, recv_msg_channel_extended_data},
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58 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust},
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59 {SSH_MSG_USERAUTH_FAILURE, recv_msg_userauth_failure}, /* client */
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60 {SSH_MSG_USERAUTH_SUCCESS, recv_msg_userauth_success}, /* client */
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61 {SSH_MSG_KEXINIT, recv_msg_kexinit},
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62 {SSH_MSG_KEXDH_REPLY, recv_msg_kexdh_reply}, /* client */
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63 {SSH_MSG_NEWKEYS, recv_msg_newkeys},
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64 {SSH_MSG_SERVICE_ACCEPT, recv_msg_service_accept}, /* client */
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65 {SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request},
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66 {SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open},
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67 {SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof},
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68 {SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close},
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69 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation},
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70 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure},
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71 {SSH_MSG_USERAUTH_BANNER, recv_msg_userauth_banner}, /* client */
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72 {SSH_MSG_USERAUTH_SPECIFIC_60, recv_msg_userauth_specific_60}, /* client */
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73 {SSH_MSG_GLOBAL_REQUEST, recv_msg_global_request_cli},
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74 {SSH_MSG_CHANNEL_SUCCESS, ignore_recv_response},
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75 {SSH_MSG_CHANNEL_FAILURE, ignore_recv_response},
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76 #ifdef ENABLE_CLI_REMOTETCPFWD
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77 {SSH_MSG_REQUEST_SUCCESS, cli_recv_msg_request_success}, /* client */
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78 {SSH_MSG_REQUEST_FAILURE, cli_recv_msg_request_failure}, /* client */
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79 #else
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80 /* For keepalive */
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81 {SSH_MSG_REQUEST_SUCCESS, ignore_recv_response},
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82 {SSH_MSG_REQUEST_FAILURE, ignore_recv_response},
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83 #endif
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84 {0, 0} /* End */
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85 };
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86
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87 static const struct ChanType *cli_chantypes[] = {
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88 #ifdef ENABLE_CLI_REMOTETCPFWD
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89 &cli_chan_tcpremote,
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90 #endif
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91 #ifdef ENABLE_CLI_AGENTFWD
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92 &cli_chan_agent,
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93 #endif
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94 NULL /* Null termination */
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95 };
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96
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97 void cli_connected(int result, int sock, void* userdata, const char *errstring)
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98 {
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99 struct sshsession *myses = userdata;
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100 if (result == DROPBEAR_FAILURE) {
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101 dropbear_exit("Connect failed: %s", errstring);
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102 }
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103 myses->sock_in = myses->sock_out = sock;
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104 update_channel_prio();
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105 }
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106
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107 void cli_session(int sock_in, int sock_out, struct dropbear_progress_connection *progress) {
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108
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109 common_session_init(sock_in, sock_out);
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110
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111 if (progress) {
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112 connect_set_writequeue(progress, &ses.writequeue);
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113 }
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114
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115 chaninitialise(cli_chantypes);
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116
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117 /* Set up cli_ses vars */
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118 cli_session_init();
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119
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120
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121 /* Ready to go */
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122 sessinitdone = 1;
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123
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124 /* Exchange identification */
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125 send_session_identification();
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126
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127 send_msg_kexinit();
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128
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129 session_loop(cli_sessionloop);
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130
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131 /* Not reached */
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132
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133 }
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134
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135 #ifdef USE_KEX_FIRST_FOLLOWS
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136 static void cli_send_kex_first_guess() {
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137 send_msg_kexdh_init();
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138 }
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139 #endif
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diff changeset
140
33
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diff changeset
141 static void cli_session_init() {
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diff changeset
142
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diff changeset
143 cli_ses.state = STATE_NOTHING;
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parents: 26
diff changeset
144 cli_ses.kex_state = KEX_NOTHING;
f789045062e6 Progressing client support
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parents: 26
diff changeset
145
39
0883c0906870 tty raw mode support works mostly
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parents: 37
diff changeset
146 cli_ses.tty_raw_mode = 0;
41
18eccbfb9641 added window-size change handling
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parents: 40
diff changeset
147 cli_ses.winchange = 0;
39
0883c0906870 tty raw mode support works mostly
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parents: 37
diff changeset
148
175
2c5741e4b855 * Reset the non-blocking status of stdout and stderr as well on exit
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
149 /* We store std{in,out,err}'s flags, so we can set them back on exit
2c5741e4b855 * Reset the non-blocking status of stdout and stderr as well on exit
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
150 * (otherwise busybox's ash isn't happy */
99
0247fbd9379d Move the revert-to-non-blocking-stdin code to cli-session so it
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
151 cli_ses.stdincopy = dup(STDIN_FILENO);
0247fbd9379d Move the revert-to-non-blocking-stdin code to cli-session so it
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
152 cli_ses.stdinflags = fcntl(STDIN_FILENO, F_GETFL, 0);
175
2c5741e4b855 * Reset the non-blocking status of stdout and stderr as well on exit
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
153 cli_ses.stdoutcopy = dup(STDOUT_FILENO);
2c5741e4b855 * Reset the non-blocking status of stdout and stderr as well on exit
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
154 cli_ses.stdoutflags = fcntl(STDOUT_FILENO, F_GETFL, 0);
2c5741e4b855 * Reset the non-blocking status of stdout and stderr as well on exit
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
155 cli_ses.stderrcopy = dup(STDERR_FILENO);
2c5741e4b855 * Reset the non-blocking status of stdout and stderr as well on exit
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
156 cli_ses.stderrflags = fcntl(STDERR_FILENO, F_GETFL, 0);
99
0247fbd9379d Move the revert-to-non-blocking-stdin code to cli-session so it
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
157
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents: 107
diff changeset
158 cli_ses.retval = EXIT_SUCCESS; /* Assume it's clean if we don't get a
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents: 107
diff changeset
159 specific exit status */
10f4d3319780 - added circular buffering for channels
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parents: 107
diff changeset
160
47
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 45
diff changeset
161 /* Auth */
215
aad4b3f58556 rename PubkeyList to SignKeyList for clarity
Matt Johnston <matt@ucc.asn.au>
parents: 175
diff changeset
162 cli_ses.lastprivkey = NULL;
136
fb7147e2fb04 - Fixed a couple of compile warnings
Matt Johnston <matt@ucc.asn.au>
parents: 108
diff changeset
163 cli_ses.lastauthtype = 0;
47
4b53a43f0082 - client pubkey auth works
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parents: 45
diff changeset
164
686
983a817f8e41 - Only request "none" cipher after auth has succeeded
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parents: 594
diff changeset
165 #ifdef DROPBEAR_NONE_CIPHER
983a817f8e41 - Only request "none" cipher after auth has succeeded
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parents: 594
diff changeset
166 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
167 set_algo_usable(sshciphers, "none", 0);
983a817f8e41 - Only request "none" cipher after auth has succeeded
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parents: 594
diff changeset
168 #else
983a817f8e41 - Only request "none" cipher after auth has succeeded
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parents: 594
diff changeset
169 cli_ses.cipher_none_after_auth = 0;
983a817f8e41 - Only request "none" cipher after auth has succeeded
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parents: 594
diff changeset
170 #endif
983a817f8e41 - Only request "none" cipher after auth has succeeded
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diff changeset
171
33
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parents: 26
diff changeset
172 /* For printing "remote host closed" for the user */
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parents: 26
diff changeset
173 ses.remoteclosed = cli_remoteclosed;
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parents: 26
diff changeset
174
925
bae0b34bc059 Better PAM through recursion
Matt Johnston <matt@ucc.asn.au>
parents: 883
diff changeset
175 ses.loop_handler = cli_sessionloop;
733
70811267715c Run the cleanup handler also when we close due to TCP connection being closed
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parents: 731
diff changeset
176 ses.extra_session_cleanup = cli_session_cleanup;
33
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diff changeset
177
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diff changeset
178 /* packet handlers */
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
179 ses.packettypes = cli_packettypes;
35
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
180
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
181 ses.isserver = 0;
739
d44325108d0e first_kex_packet_follows working, needs tidying
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parents: 686
diff changeset
182
746
465fefc4f6e0 Put some #ifdef options around first-follows options in case they
Matt Johnston <matt@ucc.asn.au>
parents: 745
diff changeset
183 #ifdef USE_KEX_FIRST_FOLLOWS
739
d44325108d0e first_kex_packet_follows working, needs tidying
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parents: 686
diff changeset
184 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
185 #endif
739
d44325108d0e first_kex_packet_follows working, needs tidying
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parents: 686
diff changeset
186
26
0969767bca0d snapshot of stuff
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parents:
diff changeset
187 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
188
727
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
189 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
190
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
191 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
192
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
193 CHECKCLEARTOWRITE();
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
194
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
195 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
196 buf_putstring(ses.writepayload, servicename, strlen(servicename));
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
197
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
198 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
199 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
200 }
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
201
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
202 static void recv_msg_service_accept(void) {
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
203 /* 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
204 }
00bc3df3a9c3 Don't bother waiting for a ssh-connection service reply - the server
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
205
33
f789045062e6 Progressing client support
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parents: 26
diff changeset
206 /* 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
207 * service, userauth and channel requests */
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
208 static void cli_sessionloop() {
0969767bca0d snapshot of stuff
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parents:
diff changeset
209
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 727
diff changeset
210 TRACE2(("enter cli_sessionloop"))
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
211
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
212 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
213 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
214 return;
15999b098cc9 Don't usually need to recalculate dh_e for the repeated kexdh_init packet
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parents: 743
diff changeset
215 }
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
34
e2a1eaa19f22 Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
217 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
218 /* 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
219 * negotiation would have failed. */
739
d44325108d0e first_kex_packet_follows working, needs tidying
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parents: 686
diff changeset
220 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
221 send_msg_kexdh_init();
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 686
diff changeset
222 }
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 686
diff changeset
223 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
224 TRACE(("leave cli_sessionloop: done with KEXINIT_RCVD"))
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
225 return;
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
226 }
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
227
f789045062e6 Progressing client support
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parents: 26
diff changeset
228 /* 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
229 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
230 cli_ses.kex_state = KEX_NOTHING;
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
231 }
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
232
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
233 /* 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
234 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
235 TRACE(("leave cli_sessionloop: kex_state != KEX_NOTHING"))
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
236 return;
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
237 }
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
238
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
239 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
240 /* 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
241 * 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
242 TRACE2(("donefirstkex false\n"))
34
e2a1eaa19f22 Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
243 return;
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
244 }
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
245
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 switch (cli_ses.state) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
248 case STATE_NOTHING:
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
249 /* 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
250 * userauth */
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
251 send_msg_service_request(SSH_SERVICE_USERAUTH);
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
252 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
253 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
254 TRACE(("leave cli_sessionloop: sent userauth methods req"))
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
255 return;
883
ff597bf2cfb0 DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
256
ff597bf2cfb0 DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
257 case USERAUTH_REQ_SENT:
ff597bf2cfb0 DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
258 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
259 return;
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
260
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
261 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
262 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
263 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
264 }
45
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
Matt Johnston <matt@ucc.asn.au>
parents: 43
diff changeset
265 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
266 TRACE(("leave cli_sessionloop: cli_auth_try"))
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
267 return;
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
268
37
0913e2ee3545 we're nearly there yet
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
269 case USERAUTH_SUCCESS_RCVD:
326
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
270
686
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
271 #ifdef DROPBEAR_NONE_CIPHER
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
272 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
273 {
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
274 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
275 send_msg_kexinit();
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
276 }
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
277 #endif
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
278
326
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
279 if (cli_opts.backgrounded) {
d965110e3f5c add -f background option to dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 325
diff changeset
280 int devnull;
433
c216212001fc Fix for -pedantic -ansi compilation, change // to /**/, plus some signedness
Matt Johnston <matt@ucc.asn.au>
parents: 326
diff changeset
281 /* keeping stdin open steals input from the terminal and
c216212001fc Fix for -pedantic -ansi compilation, change // to /**/, plus some signedness
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parents: 326
diff changeset
282 is confusing, though stdout/stderr could be useful. */
326
d965110e3f5c add -f background option to dbclient
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parents: 325
diff changeset
283 devnull = open(_PATH_DEVNULL, O_RDONLY);
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parents: 325
diff changeset
284 if (devnull < 0) {
594
a98a2138364a Improve capitalisation for all logged strings
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parents: 568
diff changeset
285 dropbear_exit("Opening /dev/null: %d %s",
326
d965110e3f5c add -f background option to dbclient
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diff changeset
286 errno, strerror(errno));
d965110e3f5c add -f background option to dbclient
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parents: 325
diff changeset
287 }
d965110e3f5c add -f background option to dbclient
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parents: 325
diff changeset
288 dup2(devnull, STDIN_FILENO);
d965110e3f5c add -f background option to dbclient
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parents: 325
diff changeset
289 if (daemon(0, 1) < 0) {
d965110e3f5c add -f background option to dbclient
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parents: 325
diff changeset
290 dropbear_exit("Backgrounding failed: %d %s",
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diff changeset
291 errno, strerror(errno));
d965110e3f5c add -f background option to dbclient
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parents: 325
diff changeset
292 }
d965110e3f5c add -f background option to dbclient
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parents: 325
diff changeset
293 }
d965110e3f5c add -f background option to dbclient
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parents: 325
diff changeset
294
485
12d845ab7b5f Rework netcat-alike to be a proper mode, with -B argument.
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parents: 478
diff changeset
295 #ifdef ENABLE_CLI_NETCAT
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parents: 478
diff changeset
296 if (cli_opts.netcat_host) {
12d845ab7b5f Rework netcat-alike to be a proper mode, with -B argument.
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parents: 478
diff changeset
297 cli_send_netcat_request();
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parents: 478
diff changeset
298 } else
12d845ab7b5f Rework netcat-alike to be a proper mode, with -B argument.
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parents: 478
diff changeset
299 #endif
560
52d7301e46bd Agent forwarding works
Matt Johnston <matt@ucc.asn.au>
parents: 547
diff changeset
300 if (!cli_opts.no_cmd) {
325
0e4f225b7e07 Add -N "no remote command" dbclient option.
Matt Johnston <matt@ucc.asn.au>
parents: 272
diff changeset
301 cli_send_chansess_request();
0e4f225b7e07 Add -N "no remote command" dbclient option.
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parents: 272
diff changeset
302 }
754
2400b8685762 setup tcp after requesting a channel - might hide some DNS latency
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303
2400b8685762 setup tcp after requesting a channel - might hide some DNS latency
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diff changeset
304 #ifdef ENABLE_CLI_LOCALTCPFWD
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diff changeset
305 setup_localtcp();
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diff changeset
306 #endif
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diff changeset
307 #ifdef ENABLE_CLI_REMOTETCPFWD
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diff changeset
308 setup_remotetcp();
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parents: 753
diff changeset
309 #endif
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diff changeset
310
325
0e4f225b7e07 Add -N "no remote command" dbclient option.
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parents: 272
diff changeset
311 TRACE(("leave cli_sessionloop: running"))
37
0913e2ee3545 we're nearly there yet
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diff changeset
312 cli_ses.state = SESSION_RUNNING;
0913e2ee3545 we're nearly there yet
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parents: 35
diff changeset
313 return;
0913e2ee3545 we're nearly there yet
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parents: 35
diff changeset
314
40
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parents: 39
diff changeset
315 case SESSION_RUNNING:
325
0e4f225b7e07 Add -N "no remote command" dbclient option.
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parents: 272
diff changeset
316 if (ses.chancount < 1 && !cli_opts.no_cmd) {
40
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parents: 39
diff changeset
317 cli_finished();
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parents: 39
diff changeset
318 }
41
18eccbfb9641 added window-size change handling
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parents: 40
diff changeset
319
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
320 if (cli_ses.winchange) {
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
321 cli_chansess_winchange();
18eccbfb9641 added window-size change handling
Matt Johnston <matt@ucc.asn.au>
parents: 40
diff changeset
322 }
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
323 return;
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parents: 39
diff changeset
324
33
f789045062e6 Progressing client support
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parents: 26
diff changeset
325 /* XXX more here needed */
f789045062e6 Progressing client support
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parents: 26
diff changeset
326
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
327
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
328 default:
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
329 break;
26
0969767bca0d snapshot of stuff
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parents:
diff changeset
330 }
0969767bca0d snapshot of stuff
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parents:
diff changeset
331
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 727
diff changeset
332 TRACE2(("leave cli_sessionloop: fell out"))
26
0969767bca0d snapshot of stuff
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parents:
diff changeset
333
0969767bca0d snapshot of stuff
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parents:
diff changeset
334 }
0969767bca0d snapshot of stuff
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parents:
diff changeset
335
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
336 static void cli_session_cleanup(void) {
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
337
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
338 if (!sessinitdone) {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
339 return;
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
340 }
99
0247fbd9379d Move the revert-to-non-blocking-stdin code to cli-session so it
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
341
175
2c5741e4b855 * Reset the non-blocking status of stdout and stderr as well on exit
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
342 /* 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
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
343 * we don't revert the flags */
100
c72f5c10125d oops, the fcntl() was commented out
Matt Johnston <matt@ucc.asn.au>
parents: 99
diff changeset
344 fcntl(cli_ses.stdincopy, F_SETFL, cli_ses.stdinflags);
175
2c5741e4b855 * Reset the non-blocking status of stdout and stderr as well on exit
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
345 fcntl(cli_ses.stdoutcopy, F_SETFL, cli_ses.stdoutflags);
2c5741e4b855 * Reset the non-blocking status of stdout and stderr as well on exit
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
346 fcntl(cli_ses.stderrcopy, F_SETFL, cli_ses.stderrflags);
99
0247fbd9379d Move the revert-to-non-blocking-stdin code to cli-session so it
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
347
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
348 cli_tty_cleanup();
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
349
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
350 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
351
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
352 static void cli_finished() {
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
353
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
354 session_cleanup();
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
355 fprintf(stderr, "Connection to %[email protected]%s:%s closed.\n", cli_opts.username,
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
356 cli_opts.remotehost, cli_opts.remoteport);
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents: 107
diff changeset
357 exit(cli_ses.retval);
40
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
358 }
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
359
b4874d772210 - Added terminal mode handling etc for the client, and window change
Matt Johnston <matt@ucc.asn.au>
parents: 39
diff changeset
360
26
0969767bca0d snapshot of stuff
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parents:
diff changeset
361 /* called when the remote side closes the connection */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
362 static void cli_remoteclosed() {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
363
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
364 /* XXX TODO perhaps print a friendlier message if we get this but have
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
365 * already sent/received disconnect message(s) ??? */
479
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
Matt Johnston <matt@ucc.asn.au>
parents: 433
diff changeset
366 m_close(ses.sock_in);
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
Matt Johnston <matt@ucc.asn.au>
parents: 433
diff changeset
367 m_close(ses.sock_out);
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
Matt Johnston <matt@ucc.asn.au>
parents: 433
diff changeset
368 ses.sock_in = -1;
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
Matt Johnston <matt@ucc.asn.au>
parents: 433
diff changeset
369 ses.sock_out = -1;
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
370 dropbear_exit("Remote closed the connection");
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
371 }
43
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
372
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
373 /* Operates in-place turning dirty (untrusted potentially containing control
249
efbaf6b03837 added keyboard-interactive client support
Matt Johnston <matt@ucc.asn.au>
parents: 215
diff changeset
374 * characters) text into clean text.
efbaf6b03837 added keyboard-interactive client support
Matt Johnston <matt@ucc.asn.au>
parents: 215
diff changeset
375 * Note: this is safe only with ascii - other charsets could have problems. */
43
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
376 void cleantext(unsigned char* dirtytext) {
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
377
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
378 unsigned int i, j;
47
4b53a43f0082 - client pubkey auth works
Matt Johnston <matt@ucc.asn.au>
parents: 45
diff changeset
379 unsigned char c;
43
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
380
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
381 j = 0;
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
382 for (i = 0; dirtytext[i] != '\0'; i++) {
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
383
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
384 c = dirtytext[i];
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
385 /* We can ignore '\r's */
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
386 if ( (c >= ' ' && c <= '~') || c == '\n' || c == '\t') {
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
387 dirtytext[j] = c;
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
388 j++;
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
389 }
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
390 }
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
391 /* Null terminate */
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
392 dirtytext[j] = '\0';
942b22d7dd1c Banner printing
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
393 }
937
4ad38e223ccd Send a failure response if a client receives a global request
Matt Johnston <matt@ucc.asn.au>
parents: 883
diff changeset
394
4ad38e223ccd Send a failure response if a client receives a global request
Matt Johnston <matt@ucc.asn.au>
parents: 883
diff changeset
395 static void recv_msg_global_request_cli(void) {
4ad38e223ccd Send a failure response if a client receives a global request
Matt Johnston <matt@ucc.asn.au>
parents: 883
diff changeset
396 TRACE(("recv_msg_global_request_cli"))
4ad38e223ccd Send a failure response if a client receives a global request
Matt Johnston <matt@ucc.asn.au>
parents: 883
diff changeset
397 /* Send a proper rejection */
4ad38e223ccd Send a failure response if a client receives a global request
Matt Johnston <matt@ucc.asn.au>
parents: 883
diff changeset
398 send_msg_request_failure();
4ad38e223ccd Send a failure response if a client receives a global request
Matt Johnston <matt@ucc.asn.au>
parents: 883
diff changeset
399 }