Mercurial > dropbear
annotate process-packet.c @ 667:fc7ae88e63b3
Rename HAVE_FORK to USE_VFORK
It makes it a bit more obvious why there's a test there since HAVE_FORK
is the normal case.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 09 Apr 2012 20:35:13 +0800 |
parents | a98a2138364a |
children | 9a5438271556 |
rev | line source |
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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 ses.lastpacket = type; |
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54 |
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55 ses.last_packet_time = time(NULL); |
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56 |
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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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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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67 TRACE(("SSH_MSG_UNIMPLEMENTED")) |
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68 dropbear_exit("Received SSH_MSG_UNIMPLEMENTED"); |
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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 |
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75 /* This applies for KEX, where the spec says the next packet MUST be |
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76 * NEWKEYS */ |
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77 if (ses.requirenext != 0) { |
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78 if (ses.requirenext != type) { |
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79 /* TODO send disconnect? */ |
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80 dropbear_exit("Unexpected packet type %d, expected %d", type, |
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81 ses.requirenext); |
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82 } else { |
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83 /* Got what we expected */ |
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84 ses.requirenext = 0; |
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85 } |
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86 } |
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87 |
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88 /* Check if we should ignore this packet. Used currently only for |
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89 * KEX code, with first_kex_packet_follows */ |
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90 if (ses.ignorenext) { |
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91 TRACE(("Ignoring packet, type = %d", type)) |
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92 ses.ignorenext = 0; |
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93 goto out; |
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94 } |
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95 |
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96 |
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97 /* Kindly the protocol authors gave all the preauth packets type values |
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98 * less-than-or-equal-to 60 ( == MAX_UNAUTH_PACKET_TYPE ). |
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99 * NOTE: if the protocol changes and new types are added, revisit this |
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100 * assumption */ |
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101 if ( !ses.authstate.authdone && type > MAX_UNAUTH_PACKET_TYPE ) { |
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102 dropbear_exit("Received message %d before userauth", type); |
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103 } |
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104 |
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105 for (i = 0; ; i++) { |
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106 if (ses.packettypes[i].type == 0) { |
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107 /* end of list */ |
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108 break; |
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109 } |
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110 |
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111 if (ses.packettypes[i].type == type) { |
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112 ses.packettypes[i].handler(); |
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113 goto out; |
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114 } |
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115 } |
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116 |
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117 |
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118 /* TODO do something more here? */ |
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119 TRACE(("preauth unknown packet")) |
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120 recv_unimplemented(); |
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121 |
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122 out: |
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123 buf_free(ses.payload); |
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124 ses.payload = NULL; |
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125 |
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126 TRACE(("leave process_packet")) |
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127 } |
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128 |
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129 |
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130 |
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131 /* This must be called directly after receiving the unimplemented packet. |
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132 * Isn't the most clean implementation, it relies on packet processing |
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133 * occurring directly after decryption (direct use of ses.recvseq). |
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134 * This is reasonably valid, since there is only a single decryption buffer */ |
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135 static void recv_unimplemented() { |
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136 |
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137 CHECKCLEARTOWRITE(); |
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138 |
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139 buf_putbyte(ses.writepayload, SSH_MSG_UNIMPLEMENTED); |
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140 /* the decryption routine increments the sequence number, we must |
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141 * decrement */ |
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142 buf_putint(ses.writepayload, ses.recvseq - 1); |
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143 |
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144 encrypt_packet(); |
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145 } |