Mercurial > dropbear

annotate process-packet.c @ 1732:2f5d797d9811

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Don't choke on disabled authorized_keys(5) options As of 2020.79 X11 forwarding is disabled at build time, which could lock out users with authorized_keys(5) files containing ‘no-X11-forwarding’ options.
author Guilhem Moulin <guilhem@debian.org>
date Fri, 26 Jun 2020 20:56:03 +0800
parents 41bf8f216644
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
22
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Matt Johnston <matt@ucc.asn.au>
parents:
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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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parents:
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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 "dbrandom.h"
22
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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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9169e4e7cbee fix empty C prototypes
Francois Perrad <francois.perrad@gadz.org>
parents: 939
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40 static void recv_unimplemented(void);
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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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a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
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47 time_t now;
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48
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9a5438271556 Move the more verbose TRACE() statements into TRACE2()
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49 TRACE2(("enter process_packet"))
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50
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51 type = buf_getbyte(ses.payload);
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parents: 731
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52 TRACE(("process_packet: packet type = %d, len %d", type, ses.payload->len))
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53
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54 now = monotonic_now();
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55 ses.last_packet_time_keepalive_recv = now;
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parents: 513
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56
22
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57 /* These packets we can receive at any time */
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58 switch(type) {
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59
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60 case SSH_MSG_IGNORE:
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7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
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parents: 426
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61 goto out;
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62 case SSH_MSG_DEBUG:
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63 goto out;
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64
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65 case SSH_MSG_UNIMPLEMENTED:
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66 /* debugging XXX */
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parents: 42
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67 TRACE(("SSH_MSG_UNIMPLEMENTED"))
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a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
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parents: 928
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68 goto out;
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69
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70 case SSH_MSG_DISCONNECT:
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71 /* TODO cleanup? */
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72 dropbear_close("Disconnect received");
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73 }
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74
939
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Matt Johnston <matt@ucc.asn.au>
parents: 928
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75 /* Ignore these packet types so that keepalives don't interfere with
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 928
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76 idle detection. This is slightly incorrect since a tcp forwarded
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 928
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77 global request with failure won't trigger the idle timeout,
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 928
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78 but that's probably acceptable */
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aeda68938596 Add files via upload (#90)
jcmathews <jesselcmathews@yahoo.co.in>
parents: 1276
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79 if (!(type == SSH_MSG_GLOBAL_REQUEST
aeda68938596 Add files via upload (#90)
jcmathews <jesselcmathews@yahoo.co.in>
parents: 1276
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80 || type == SSH_MSG_REQUEST_FAILURE
aeda68938596 Add files via upload (#90)
jcmathews <jesselcmathews@yahoo.co.in>
parents: 1276
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81 || type == SSH_MSG_CHANNEL_FAILURE)) {
939
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 928
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82 ses.last_packet_time_idle = now;
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 928
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83 }
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 928
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84
22
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parents:
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85 /* This applies for KEX, where the spec says the next packet MUST be
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
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86 * NEWKEYS */
886
cbc73a5aefb0 requirenext doesn't need two values
Matt Johnston <matt@ucc.asn.au>
parents: 885
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87 if (ses.requirenext != 0) {
cbc73a5aefb0 requirenext doesn't need two values
Matt Johnston <matt@ucc.asn.au>
parents: 885
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88 if (ses.requirenext == type)
885
19ce21bd198a Fix failing rekeying when we receive a still-in-flight packet
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
89 {
22
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Matt Johnston <matt@ucc.asn.au>
parents:
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90 /* Got what we expected */
886
cbc73a5aefb0 requirenext doesn't need two values
Matt Johnston <matt@ucc.asn.au>
parents: 885
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91 TRACE(("got expected packet %d during kexinit", type))
22
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Matt Johnston <matt@ucc.asn.au>
parents:
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92 }
885
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Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
93 else
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Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
94 {
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Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
95 /* RFC4253 7.1 - various messages are allowed at this point.
19ce21bd198a Fix failing rekeying when we receive a still-in-flight packet
Matt Johnston <matt@ucc.asn.au>
parents: 858
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96 The only ones we know about have already been handled though,
19ce21bd198a Fix failing rekeying when we receive a still-in-flight packet
Matt Johnston <matt@ucc.asn.au>
parents: 858
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97 so just return "unimplemented" */
19ce21bd198a Fix failing rekeying when we receive a still-in-flight packet
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
98 if (type >= 1 && type <= 49
19ce21bd198a Fix failing rekeying when we receive a still-in-flight packet
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
99 && type != SSH_MSG_SERVICE_REQUEST
19ce21bd198a Fix failing rekeying when we receive a still-in-flight packet
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
100 && type != SSH_MSG_SERVICE_ACCEPT
19ce21bd198a Fix failing rekeying when we receive a still-in-flight packet
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
101 && type != SSH_MSG_KEXINIT)
19ce21bd198a Fix failing rekeying when we receive a still-in-flight packet
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
102 {
19ce21bd198a Fix failing rekeying when we receive a still-in-flight packet
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
103 TRACE(("unknown allowed packet during kexinit"))
19ce21bd198a Fix failing rekeying when we receive a still-in-flight packet
Matt Johnston <matt@ucc.asn.au>
parents: 858
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104 recv_unimplemented();
19ce21bd198a Fix failing rekeying when we receive a still-in-flight packet
Matt Johnston <matt@ucc.asn.au>
parents: 858
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105 goto out;
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Matt Johnston <matt@ucc.asn.au>
parents: 858
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106 }
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Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
107 else
19ce21bd198a Fix failing rekeying when we receive a still-in-flight packet
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
108 {
19ce21bd198a Fix failing rekeying when we receive a still-in-flight packet
Matt Johnston <matt@ucc.asn.au>
parents: 858
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109 TRACE(("disallowed packet during kexinit"))
886
cbc73a5aefb0 requirenext doesn't need two values
Matt Johnston <matt@ucc.asn.au>
parents: 885
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110 dropbear_exit("Unexpected packet type %d, expected %d", type,
cbc73a5aefb0 requirenext doesn't need two values
Matt Johnston <matt@ucc.asn.au>
parents: 885
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111 ses.requirenext);
885
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Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
112 }
19ce21bd198a Fix failing rekeying when we receive a still-in-flight packet
Matt Johnston <matt@ucc.asn.au>
parents: 858
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113 }
22
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parents:
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114 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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115
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116 /* Check if we should ignore this packet. Used currently only for
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Matt Johnston <matt@ucc.asn.au>
parents:
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117 * KEX code, with first_kex_packet_follows */
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parents:
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118 if (ses.ignorenext) {
165
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parents: 42
diff changeset
119 TRACE(("Ignoring packet, type = %d", type))
22
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Matt Johnston <matt@ucc.asn.au>
parents:
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120 ses.ignorenext = 0;
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parents:
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121 goto out;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
122 }
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parents:
diff changeset
123
886
cbc73a5aefb0 requirenext doesn't need two values
Matt Johnston <matt@ucc.asn.au>
parents: 885
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124 /* Only clear the flag after we have checked ignorenext */
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Matt Johnston <matt@ucc.asn.au>
parents: 885
diff changeset
125 if (ses.requirenext != 0 && ses.requirenext == type)
cbc73a5aefb0 requirenext doesn't need two values
Matt Johnston <matt@ucc.asn.au>
parents: 885
diff changeset
126 {
cbc73a5aefb0 requirenext doesn't need two values
Matt Johnston <matt@ucc.asn.au>
parents: 885
diff changeset
127 ses.requirenext = 0;
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parents: 885
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128 }
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parents: 885
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129
22
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130
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131 /* Kindly the protocol authors gave all the preauth packets type values
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132 * less-than-or-equal-to 60 ( == MAX_UNAUTH_PACKET_TYPE ).
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133 * NOTE: if the protocol changes and new types are added, revisit this
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134 * assumption */
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
135 if ( !ses.authstate.authdone && type > MAX_UNAUTH_PACKET_TYPE ) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 592
diff changeset
136 dropbear_exit("Received message %d before userauth", type);
22
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137 }
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parents:
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138
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
139 for (i = 0; ; i++) {
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parents:
diff changeset
140 if (ses.packettypes[i].type == 0) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
141 /* end of list */
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Matt Johnston <matt@ucc.asn.au>
parents:
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142 break;
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Matt Johnston <matt@ucc.asn.au>
parents:
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143 }
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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 if (ses.packettypes[i].type == type) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146 ses.packettypes[i].handler();
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147 goto out;
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parents:
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148 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
149 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
150
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
151
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parents:
diff changeset
152 /* TODO do something more here? */
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 42
diff changeset
153 TRACE(("preauth unknown packet"))
22
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
154 recv_unimplemented();
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Matt Johnston <matt@ucc.asn.au>
parents:
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155
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 out:
1681
435cfb9ec96e send and handle SSH_MSG_EXT_INFO only at the correct point
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
157 ses.lastpacket = type;
22
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Matt Johnston <matt@ucc.asn.au>
parents:
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158 buf_free(ses.payload);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159 ses.payload = NULL;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
160
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
161 TRACE2(("leave process_packet"))
22
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
162 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
163
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
164
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
165
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166 /* This must be called directly after receiving the unimplemented packet.
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
167 * Isn't the most clean implementation, it relies on packet processing
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168 * occurring directly after decryption (direct use of ses.recvseq).
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
169 * This is reasonably valid, since there is only a single decryption buffer */
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
170 static void recv_unimplemented() {
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
171
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
172 CHECKCLEARTOWRITE();
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
173
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174 buf_putbyte(ses.writepayload, SSH_MSG_UNIMPLEMENTED);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
175 /* the decryption routine increments the sequence number, we must
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
176 * decrement */
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
177 buf_putint(ses.writepayload, ses.recvseq - 1);
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
178
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
179 encrypt_packet();
c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
180 }