Mercurial > dropbear

annotate process-packet.c @ 27:08da099e8337

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- Rename common-packet.c to packet.c - buf_burn the unencrypted read/write payload buffers after use to avoid sensitive contents sitting in memory for too long
author Matt Johnston <matt@ucc.asn.au>
date Tue, 27 Jul 2004 02:14:42 +0000
parents 0969767bca0d
children e2a1eaa19f22
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
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53 /* These packets we can receive at any time */
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54 switch(type) {
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55
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56 case SSH_MSG_IGNORE:
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57 case SSH_MSG_DEBUG:
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58 TRACE(("received SSH_MSG_IGNORE or SSH_MSG_DEBUG"));
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59 goto out;
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60
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61 case SSH_MSG_UNIMPLEMENTED:
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62 /* debugging XXX */
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63 TRACE(("SSH_MSG_UNIMPLEMENTED"));
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64 dropbear_exit("received SSH_MSG_UNIMPLEMENTED");
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65
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66 case SSH_MSG_DISCONNECT:
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67 /* TODO cleanup? */
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68 dropbear_close("Disconnect received");
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69 }
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70
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71
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72 /* This applies for KEX, where the spec says the next packet MUST be
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73 * NEWKEYS */
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74 if (ses.requirenext != 0) {
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75 if (ses.requirenext != type) {
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76 /* TODO send disconnect? */
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77 dropbear_exit("unexpected packet type %d, expected %d", type,
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78 ses.requirenext);
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79 } else {
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80 /* Got what we expected */
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81 ses.requirenext = 0;
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82 }
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83 }
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84
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85 /* Check if we should ignore this packet. Used currently only for
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86 * KEX code, with first_kex_packet_follows */
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87 if (ses.ignorenext) {
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88 TRACE(("Ignoring packet, type = %d", type));
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89 ses.ignorenext = 0;
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90 goto out;
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91 }
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92
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93 /* XXX This code somewhere else perhaps? */
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94 #ifdef DROPBEAR_CLIENT
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95 if (IS_DROPBEAR_CLIENT) {
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96
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97 /* XXX - needs changing */
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98 /* In client mode, we REUSE ses.expecting to proceed to the
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99 * next phase when a packet was received.
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100 * If the "expecting" flag is set to a non-null value, it will
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101 * be reset when a packet of that type is received.
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102 * This is different from the server-mode behaviour, when
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103 * a packet type mismatch would have caused sudden death.
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104 */
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105
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106 /* check that we aren't expecting a particular packet */
26
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parents: 22
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107 #if 0
22
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108 if (cli_ses.expecting && cli_ses.expecting == type) {
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109 cli_ses.expecting = 0;
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110 }
26
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diff changeset
111 #endif
22
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112 }
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113 #endif
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114
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115 /* Kindly the protocol authors gave all the preauth packets type values
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116 * less-than-or-equal-to 60 ( == MAX_UNAUTH_PACKET_TYPE ).
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117 * NOTE: if the protocol changes and new types are added, revisit this
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118 * assumption */
27
08da099e8337 - Rename common-packet.c to packet.c
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parents: 26
diff changeset
119 if ( !ses.authstate.authdone && type > MAX_UNAUTH_PACKET_TYPE ) {
22
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parents:
diff changeset
120 dropbear_exit("received message %d before userauth", type);
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Matt Johnston <matt@ucc.asn.au>
parents:
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121 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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122
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
123 for (i = 0; ; i++) {
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diff changeset
124 if (ses.packettypes[i].type == 0) {
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Matt Johnston <matt@ucc.asn.au>
parents:
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125 /* end of list */
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Matt Johnston <matt@ucc.asn.au>
parents:
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126 break;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
127 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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128
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
129 if (ses.packettypes[i].type == type) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
130 ses.packettypes[i].handler();
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Matt Johnston <matt@ucc.asn.au>
parents:
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131 goto out;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
132 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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133 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
134
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
135
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
136 /* TODO do something more here? */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
137 TRACE(("preauth unknown packet"));
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
138 recv_unimplemented();
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
139
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
140 out:
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
141 buf_burn(ses.payload); /* Clear the memory to avoid swapping it out */
22
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
142 buf_free(ses.payload);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
143 ses.payload = NULL;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
144
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
145 TRACE(("leave process_packet"));
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146 }
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
147
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
148
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
149
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
150 /* This must be called directly after receiving the unimplemented packet.
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
151 * Isn't the most clean implementation, it relies on packet processing
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
152 * occurring directly after decryption (direct use of ses.recvseq).
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
153 * This is reasonably valid, since there is only a single decryption buffer */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
154 static void recv_unimplemented() {
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
155
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 CHECKCLEARTOWRITE();
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
157
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
158 buf_putbyte(ses.writepayload, SSH_MSG_UNIMPLEMENTED);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159 /* the decryption routine increments the sequence number, we must
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
160 * decrement */
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
161 buf_putint(ses.writepayload, ses.recvseq - 1);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
162
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
163 encrypt_packet();
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
164 }