Mercurial > dropbear

annotate process-packet.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
parents 695413c59b6a
children 7e43f5e473b9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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22
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002-2004 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "includes.h"
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26 #include "packet.h"
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27 #include "session.h"
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28 #include "dbutil.h"
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29 #include "ssh.h"
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30 #include "algo.h"
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31 #include "buffer.h"
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32 #include "kex.h"
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33 #include "random.h"
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34 #include "service.h"
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35 #include "auth.h"
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36 #include "channel.h"
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37
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38 #define MAX_UNAUTH_PACKET_TYPE SSH_MSG_USERAUTH_PK_OK
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39
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40 static void recv_unimplemented();
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41
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42 /* process a decrypted packet, call the appropriate handler */
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43 void process_packet() {
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44
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45 unsigned char type;
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46 unsigned int i;
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47
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48 TRACE(("enter process_packet"))
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49
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50 type = buf_getbyte(ses.payload);
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51 TRACE(("process_packet: packet type = %d", type))
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52
34
e2a1eaa19f22 Client mostly works up to password auth
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53 ses.lastpacket = type;
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54
22
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55 /* These packets we can receive at any time */
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56 switch(type) {
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57
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58 case SSH_MSG_IGNORE:
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59 case SSH_MSG_DEBUG:
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60 TRACE(("received SSH_MSG_IGNORE or SSH_MSG_DEBUG"))
22
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61 goto out;
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62
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63 case SSH_MSG_UNIMPLEMENTED:
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64 /* debugging XXX */
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65 TRACE(("SSH_MSG_UNIMPLEMENTED"))
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66 dropbear_exit("received SSH_MSG_UNIMPLEMENTED");
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67
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68 case SSH_MSG_DISCONNECT:
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69 /* TODO cleanup? */
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70 dropbear_close("Disconnect received");
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71 }
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72
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73
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74 /* This applies for KEX, where the spec says the next packet MUST be
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75 * NEWKEYS */
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76 if (ses.requirenext != 0) {
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77 if (ses.requirenext != type) {
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78 /* TODO send disconnect? */
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79 dropbear_exit("unexpected packet type %d, expected %d", type,
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80 ses.requirenext);
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81 } else {
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82 /* Got what we expected */
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83 ses.requirenext = 0;
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84 }
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85 }
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86
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87 /* Check if we should ignore this packet. Used currently only for
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88 * KEX code, with first_kex_packet_follows */
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89 if (ses.ignorenext) {
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parents: 42
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90 TRACE(("Ignoring packet, type = %d", type))
22
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91 ses.ignorenext = 0;
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92 goto out;
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93 }
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94
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95
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96 /* Kindly the protocol authors gave all the preauth packets type values
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97 * less-than-or-equal-to 60 ( == MAX_UNAUTH_PACKET_TYPE ).
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98 * NOTE: if the protocol changes and new types are added, revisit this
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99 * assumption */
27
08da099e8337 - Rename common-packet.c to packet.c
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parents: 26
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100 if ( !ses.authstate.authdone && type > MAX_UNAUTH_PACKET_TYPE ) {
22
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101 dropbear_exit("received message %d before userauth", type);
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102 }
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103
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104 for (i = 0; ; i++) {
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105 if (ses.packettypes[i].type == 0) {
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106 /* end of list */
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107 break;
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108 }
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109
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110 if (ses.packettypes[i].type == type) {
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parents:
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111 ses.packettypes[i].handler();
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112 goto out;
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113 }
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114 }
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parents:
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115
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116
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117 /* TODO do something more here? */
165
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parents: 42
diff changeset
118 TRACE(("preauth unknown packet"))
22
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parents:
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119 recv_unimplemented();
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parents:
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120
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121 out:
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122 buf_free(ses.payload);
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123 ses.payload = NULL;
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124
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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125 TRACE(("leave process_packet"))
22
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126 }
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127
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128
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129
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130 /* This must be called directly after receiving the unimplemented packet.
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131 * Isn't the most clean implementation, it relies on packet processing
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132 * occurring directly after decryption (direct use of ses.recvseq).
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133 * This is reasonably valid, since there is only a single decryption buffer */
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134 static void recv_unimplemented() {
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135
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136 CHECKCLEARTOWRITE();
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137
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138 buf_putbyte(ses.writepayload, SSH_MSG_UNIMPLEMENTED);
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139 /* the decryption routine increments the sequence number, we must
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140 * decrement */
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141 buf_putint(ses.writepayload, ses.recvseq - 1);
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142
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143 encrypt_packet();
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144 }