Mercurial > dropbear
annotate common-kex.c @ 575:f9b5dc0cba61
- Disable compression for non-final multihops
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Fri, 11 Sep 2009 14:02:04 +0000 |
| parents | daf52f813328 |
| children | a98a2138364a |
| rev | line source |
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1 /* |
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License boilerplate etc, add Mihnea as an author to some of the files
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2 * Dropbear SSH |
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3 * |
| 33 | 4 * Copyright (c) 2002-2004 Matt Johnston |
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5 * Portions 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 |
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26 #include "includes.h" |
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27 #include "dbutil.h" |
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28 #include "algo.h" |
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29 #include "buffer.h" |
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30 #include "session.h" |
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31 #include "kex.h" |
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32 #include "ssh.h" |
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33 #include "packet.h" |
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34 #include "bignum.h" |
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35 #include "random.h" |
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36 #include "runopts.h" |
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37 |
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38 /* diffie-hellman-group1-sha1 value for p */ |
| 227 | 39 static const unsigned char dh_p_val[] = { |
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40 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2, |
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41 0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1, |
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42 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6, |
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43 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD, |
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44 0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D, |
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45 0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45, |
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46 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9, |
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47 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED, |
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48 0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11, |
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49 0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE6, 0x53, 0x81, |
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50 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; |
| 227 | 51 #define DH_P_LEN sizeof(dh_p_val) |
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52 |
| 227 | 53 static const int DH_G_VAL = 2; |
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54 |
| 33 | 55 static void kexinitialise(); |
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56 void gen_new_keys(); |
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57 #ifndef DISABLE_ZLIB |
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58 static void gen_new_zstreams(); |
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59 #endif |
| 33 | 60 static void read_kex_algos(); |
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61 /* helper function for gen_new_keys */ |
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62 static void hashkeys(unsigned char *out, int outlen, |
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63 const hash_state * hs, unsigned const char X); |
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64 |
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65 |
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66 /* Send our list of algorithms we can use */ |
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67 void send_msg_kexinit() { |
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68 |
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69 CHECKCLEARTOWRITE(); |
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70 buf_putbyte(ses.writepayload, SSH_MSG_KEXINIT); |
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71 |
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72 /* cookie */ |
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73 genrandom(buf_getwriteptr(ses.writepayload, 16), 16); |
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74 buf_incrwritepos(ses.writepayload, 16); |
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75 |
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76 /* kex algos */ |
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77 buf_put_algolist(ses.writepayload, sshkex); |
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78 |
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79 /* server_host_key_algorithms */ |
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80 buf_put_algolist(ses.writepayload, sshhostkey); |
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81 |
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82 /* encryption_algorithms_client_to_server */ |
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83 buf_put_algolist(ses.writepayload, sshciphers); |
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84 |
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85 /* encryption_algorithms_server_to_client */ |
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86 buf_put_algolist(ses.writepayload, sshciphers); |
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87 |
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88 /* mac_algorithms_client_to_server */ |
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89 buf_put_algolist(ses.writepayload, sshhashes); |
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90 |
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91 /* mac_algorithms_server_to_client */ |
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92 buf_put_algolist(ses.writepayload, sshhashes); |
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93 |
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94 /* compression_algorithms_client_to_server */ |
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95 buf_put_algolist(ses.writepayload, ses.compress_algos); |
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96 |
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97 /* compression_algorithms_server_to_client */ |
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98 buf_put_algolist(ses.writepayload, ses.compress_algos); |
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99 |
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100 /* languages_client_to_server */ |
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101 buf_putstring(ses.writepayload, "", 0); |
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102 |
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103 /* languages_server_to_client */ |
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104 buf_putstring(ses.writepayload, "", 0); |
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105 |
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106 /* first_kex_packet_follows - unimplemented for now */ |
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107 buf_putbyte(ses.writepayload, 0x00); |
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108 |
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109 /* reserved unit32 */ |
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110 buf_putint(ses.writepayload, 0); |
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111 |
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112 /* set up transmitted kex packet buffer for hashing. |
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113 * This is freed after the end of the kex */ |
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114 ses.transkexinit = buf_newcopy(ses.writepayload); |
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115 |
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116 encrypt_packet(); |
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117 ses.dataallowed = 0; /* don't send other packets during kex */ |
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118 |
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119 TRACE(("DATAALLOWED=0")) |
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120 TRACE(("-> KEXINIT")) |
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121 ses.kexstate.sentkexinit = 1; |
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122 } |
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123 |
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124 /* *** NOTE regarding (send|recv)_msg_newkeys *** |
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125 * Changed by mihnea from the original kex.c to set dataallowed after a |
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126 * completed key exchange, no matter the order in which it was performed. |
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127 * This enables client mode without affecting server functionality. |
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128 */ |
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129 |
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130 /* Bring new keys into use after a key exchange, and let the client know*/ |
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131 void send_msg_newkeys() { |
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132 |
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133 TRACE(("enter send_msg_newkeys")) |
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134 |
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135 /* generate the kexinit request */ |
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136 CHECKCLEARTOWRITE(); |
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137 buf_putbyte(ses.writepayload, SSH_MSG_NEWKEYS); |
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138 encrypt_packet(); |
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139 |
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140 |
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141 /* set up our state */ |
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142 if (ses.kexstate.recvnewkeys) { |
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143 TRACE(("while RECVNEWKEYS=1")) |
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144 gen_new_keys(); |
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145 kexinitialise(); /* we've finished with this kex */ |
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146 TRACE((" -> DATAALLOWED=1")) |
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147 ses.dataallowed = 1; /* we can send other packets again now */ |
| 33 | 148 ses.kexstate.donefirstkex = 1; |
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149 } else { |
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150 ses.kexstate.sentnewkeys = 1; |
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151 TRACE(("SENTNEWKEYS=1")) |
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152 } |
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153 |
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154 TRACE(("-> MSG_NEWKEYS")) |
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155 TRACE(("leave send_msg_newkeys")) |
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156 } |
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157 |
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158 /* Bring the new keys into use after a key exchange */ |
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159 void recv_msg_newkeys() { |
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160 |
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161 TRACE(("<- MSG_NEWKEYS")) |
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162 TRACE(("enter recv_msg_newkeys")) |
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163 |
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164 /* simply check if we've sent SSH_MSG_NEWKEYS, and if so, |
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165 * switch to the new keys */ |
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166 if (ses.kexstate.sentnewkeys) { |
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167 TRACE(("while SENTNEWKEYS=1")) |
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168 gen_new_keys(); |
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169 kexinitialise(); /* we've finished with this kex */ |
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170 TRACE((" -> DATAALLOWED=1")) |
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171 ses.dataallowed = 1; /* we can send other packets again now */ |
| 33 | 172 ses.kexstate.donefirstkex = 1; |
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173 } else { |
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174 TRACE(("RECVNEWKEYS=1")) |
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175 ses.kexstate.recvnewkeys = 1; |
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176 } |
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177 |
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178 TRACE(("leave recv_msg_newkeys")) |
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179 } |
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180 |
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181 |
| 33 | 182 /* Set up the kex for the first time */ |
| 183 void kexfirstinitialise() { | |
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184 ses.kexstate.donefirstkex = 0; |
| 33 | 185 |
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186 #ifndef DISABLE_ZLIB |
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187 if (opts.enable_compress) { |
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188 ses.compress_algos = ssh_compress; |
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189 } else |
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190 #endif |
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191 { |
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192 ses.compress_algos = ssh_nocompress; |
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193 } |
| 33 | 194 kexinitialise(); |
| 195 } | |
| 196 | |
| 197 /* Reset the kex state, ready for a new negotiation */ | |
| 198 static void kexinitialise() { | |
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199 |
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200 TRACE(("kexinitialise()")) |
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201 |
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202 /* sent/recv'd MSG_KEXINIT */ |
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203 ses.kexstate.sentkexinit = 0; |
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204 ses.kexstate.recvkexinit = 0; |
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205 |
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206 /* sent/recv'd MSG_NEWKEYS */ |
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207 ses.kexstate.recvnewkeys = 0; |
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208 ses.kexstate.sentnewkeys = 0; |
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209 |
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210 /* first_packet_follows */ |
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211 ses.kexstate.firstfollows = 0; |
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212 |
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213 ses.kexstate.datatrans = 0; |
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214 ses.kexstate.datarecv = 0; |
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215 |
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216 ses.kexstate.lastkextime = time(NULL); |
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217 |
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218 } |
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219 |
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220 /* Helper function for gen_new_keys, creates a hash. It makes a copy of the |
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221 * already initialised hash_state hs, which should already have processed |
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222 * the dh_K and hash, since these are common. X is the letter 'A', 'B' etc. |
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223 * out must have at least min(SHA1_HASH_SIZE, outlen) bytes allocated. |
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224 * The output will only be expanded once, as we are assured that |
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225 * outlen <= 2*SHA1_HASH_SIZE for all known hashes. |
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226 * |
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227 * See Section 7.2 of rfc4253 (ssh transport) for details */ |
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228 static void hashkeys(unsigned char *out, int outlen, |
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229 const hash_state * hs, const unsigned char X) { |
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230 |
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231 hash_state hs2; |
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232 unsigned char k2[SHA1_HASH_SIZE]; /* used to extending */ |
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233 |
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234 memcpy(&hs2, hs, sizeof(hash_state)); |
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235 sha1_process(&hs2, &X, 1); |
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236 sha1_process(&hs2, ses.session_id, SHA1_HASH_SIZE); |
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237 sha1_done(&hs2, out); |
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238 if (SHA1_HASH_SIZE < outlen) { |
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239 /* need to extend */ |
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240 memcpy(&hs2, hs, sizeof(hash_state)); |
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241 sha1_process(&hs2, out, SHA1_HASH_SIZE); |
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242 sha1_done(&hs2, k2); |
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243 memcpy(&out[SHA1_HASH_SIZE], k2, outlen - SHA1_HASH_SIZE); |
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244 } |
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245 } |
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246 |
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247 /* Generate the actual encryption/integrity keys, using the results of the |
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248 * key exchange, as specified in section 5.2 of the IETF secsh-transport |
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249 * draft. This occurs after the DH key-exchange. |
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250 * |
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251 * ses.newkeys is the new set of keys which are generated, these are only |
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252 * taken into use after both sides have sent a newkeys message */ |
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253 |
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254 /* Originally from kex.c, generalized for cli/svr mode --mihnea */ |
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255 void gen_new_keys() { |
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256 |
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257 unsigned char C2S_IV[MAX_IV_LEN]; |
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258 unsigned char C2S_key[MAX_KEY_LEN]; |
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259 unsigned char S2C_IV[MAX_IV_LEN]; |
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260 unsigned char S2C_key[MAX_KEY_LEN]; |
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261 /* unsigned char key[MAX_KEY_LEN]; */ |
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262 unsigned char *trans_IV, *trans_key, *recv_IV, *recv_key; |
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263 |
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264 hash_state hs; |
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265 unsigned int C2S_keysize, S2C_keysize; |
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266 char mactransletter, macrecvletter; /* Client or server specific */ |
| 342 | 267 int recv_cipher = 0, trans_cipher = 0; |
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268 |
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269 TRACE(("enter gen_new_keys")) |
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270 /* the dh_K and hash are the start of all hashes, we make use of that */ |
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271 |
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272 sha1_init(&hs); |
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273 sha1_process_mp(&hs, ses.dh_K); |
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274 mp_clear(ses.dh_K); |
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275 m_free(ses.dh_K); |
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276 sha1_process(&hs, ses.hash, SHA1_HASH_SIZE); |
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277 m_burn(ses.hash, SHA1_HASH_SIZE); |
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278 |
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279 if (IS_DROPBEAR_CLIENT) { |
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280 trans_IV = C2S_IV; |
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281 recv_IV = S2C_IV; |
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282 trans_key = C2S_key; |
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283 recv_key = S2C_key; |
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284 C2S_keysize = ses.newkeys->trans.algo_crypt->keysize; |
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285 S2C_keysize = ses.newkeys->recv.algo_crypt->keysize; |
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286 mactransletter = 'E'; |
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287 macrecvletter = 'F'; |
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288 } else { |
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289 trans_IV = S2C_IV; |
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290 recv_IV = C2S_IV; |
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291 trans_key = S2C_key; |
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292 recv_key = C2S_key; |
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293 C2S_keysize = ses.newkeys->recv.algo_crypt->keysize; |
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294 S2C_keysize = ses.newkeys->trans.algo_crypt->keysize; |
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295 mactransletter = 'F'; |
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296 macrecvletter = 'E'; |
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297 } |
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298 |
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299 hashkeys(C2S_IV, SHA1_HASH_SIZE, &hs, 'A'); |
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300 hashkeys(S2C_IV, SHA1_HASH_SIZE, &hs, 'B'); |
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301 hashkeys(C2S_key, C2S_keysize, &hs, 'C'); |
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302 hashkeys(S2C_key, S2C_keysize, &hs, 'D'); |
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303 |
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304 recv_cipher = find_cipher(ses.newkeys->recv.algo_crypt->cipherdesc->name); |
| 342 | 305 if (recv_cipher < 0) |
| 306 dropbear_exit("crypto error"); | |
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307 if (ses.newkeys->recv.crypt_mode->start(recv_cipher, |
| 502 | 308 recv_IV, recv_key, |
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309 ses.newkeys->recv.algo_crypt->keysize, 0, |
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310 &ses.newkeys->recv.cipher_state) != CRYPT_OK) { |
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311 dropbear_exit("crypto error"); |
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312 } |
| 502 | 313 |
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314 trans_cipher = find_cipher(ses.newkeys->trans.algo_crypt->cipherdesc->name); |
| 342 | 315 if (trans_cipher < 0) |
| 316 dropbear_exit("crypto error"); | |
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317 if (ses.newkeys->trans.crypt_mode->start(trans_cipher, |
| 502 | 318 trans_IV, trans_key, |
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319 ses.newkeys->trans.algo_crypt->keysize, 0, |
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320 &ses.newkeys->trans.cipher_state) != CRYPT_OK) { |
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321 dropbear_exit("crypto error"); |
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322 } |
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323 |
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324 /* MAC keys */ |
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325 hashkeys(ses.newkeys->trans.mackey, |
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326 ses.newkeys->trans.algo_mac->keysize, &hs, mactransletter); |
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327 hashkeys(ses.newkeys->recv.mackey, |
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328 ses.newkeys->recv.algo_mac->keysize, &hs, macrecvletter); |
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329 ses.newkeys->trans.hash_index = find_hash(ses.newkeys->trans.algo_mac->hashdesc->name), |
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330 ses.newkeys->recv.hash_index = find_hash(ses.newkeys->recv.algo_mac->hashdesc->name), |
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331 |
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332 #ifndef DISABLE_ZLIB |
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333 gen_new_zstreams(); |
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334 #endif |
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335 |
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336 /* Switch over to the new keys */ |
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337 m_burn(ses.keys, sizeof(struct key_context)); |
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338 m_free(ses.keys); |
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339 ses.keys = ses.newkeys; |
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340 ses.newkeys = NULL; |
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341 |
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342 TRACE(("leave gen_new_keys")) |
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343 } |
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344 |
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345 #ifndef DISABLE_ZLIB |
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346 |
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347 int is_compress_trans() { |
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348 return ses.keys->trans.algo_comp == DROPBEAR_COMP_ZLIB |
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349 || (ses.authstate.authdone |
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350 && ses.keys->trans.algo_comp == DROPBEAR_COMP_ZLIB_DELAY); |
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351 } |
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352 |
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353 int is_compress_recv() { |
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354 return ses.keys->recv.algo_comp == DROPBEAR_COMP_ZLIB |
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355 || (ses.authstate.authdone |
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356 && ses.keys->recv.algo_comp == DROPBEAR_COMP_ZLIB_DELAY); |
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357 } |
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358 |
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359 /* Set up new zlib compression streams, close the old ones. Only |
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360 * called from gen_new_keys() */ |
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361 static void gen_new_zstreams() { |
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362 |
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363 /* create new zstreams */ |
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364 if (ses.newkeys->recv.algo_comp == DROPBEAR_COMP_ZLIB |
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365 || ses.newkeys->recv.algo_comp == DROPBEAR_COMP_ZLIB_DELAY) { |
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366 ses.newkeys->recv.zstream = (z_streamp)m_malloc(sizeof(z_stream)); |
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367 ses.newkeys->recv.zstream->zalloc = Z_NULL; |
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368 ses.newkeys->recv.zstream->zfree = Z_NULL; |
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369 |
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370 if (inflateInit(ses.newkeys->recv.zstream) != Z_OK) { |
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371 dropbear_exit("zlib error"); |
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372 } |
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373 } else { |
|
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374 ses.newkeys->recv.zstream = NULL; |
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375 } |
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376 |
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377 if (ses.newkeys->trans.algo_comp == DROPBEAR_COMP_ZLIB |
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378 || ses.newkeys->trans.algo_comp == DROPBEAR_COMP_ZLIB_DELAY) { |
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379 ses.newkeys->trans.zstream = (z_streamp)m_malloc(sizeof(z_stream)); |
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380 ses.newkeys->trans.zstream->zalloc = Z_NULL; |
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381 ses.newkeys->trans.zstream->zfree = Z_NULL; |
|
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382 |
|
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383 if (deflateInit2(ses.newkeys->trans.zstream, Z_DEFAULT_COMPRESSION, |
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384 Z_DEFLATED, DROPBEAR_ZLIB_WINDOW_BITS, |
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385 DROPBEAR_ZLIB_MEM_LEVEL, Z_DEFAULT_STRATEGY) |
|
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386 != Z_OK) { |
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387 dropbear_exit("zlib error"); |
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388 } |
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389 } else { |
|
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390 ses.newkeys->trans.zstream = NULL; |
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391 } |
|
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392 |
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393 /* clean up old keys */ |
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394 if (ses.keys->recv.zstream != NULL) { |
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395 if (inflateEnd(ses.keys->recv.zstream) == Z_STREAM_ERROR) { |
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396 /* Z_DATA_ERROR is ok, just means that stream isn't ended */ |
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397 dropbear_exit("crypto error"); |
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398 } |
|
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399 m_free(ses.keys->recv.zstream); |
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400 } |
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401 if (ses.keys->trans.zstream != NULL) { |
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402 if (deflateEnd(ses.keys->trans.zstream) == Z_STREAM_ERROR) { |
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403 /* Z_DATA_ERROR is ok, just means that stream isn't ended */ |
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404 dropbear_exit("crypto error"); |
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405 } |
|
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406 m_free(ses.keys->trans.zstream); |
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407 } |
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408 } |
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409 #endif /* DISABLE_ZLIB */ |
|
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410 |
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411 |
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412 /* Executed upon receiving a kexinit message from the client to initiate |
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413 * key exchange. If we haven't already done so, we send the list of our |
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414 * preferred algorithms. The client's requested algorithms are processed, |
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415 * and we calculate the first portion of the key-exchange-hash for used |
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416 * later in the key exchange. No response is sent, as the client should |
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417 * initiate the diffie-hellman key exchange */ |
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418 |
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419 /* Originally from kex.c, generalized for cli/svr mode --mihnea */ |
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420 /* Belongs in common_kex.c where it should be moved after review */ |
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421 void recv_msg_kexinit() { |
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422 |
|
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423 unsigned int kexhashbuf_len = 0; |
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424 unsigned int remote_ident_len = 0; |
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425 unsigned int local_ident_len = 0; |
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426 |
|
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427 TRACE(("<- KEXINIT")) |
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428 TRACE(("enter recv_msg_kexinit")) |
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429 |
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430 if (!ses.kexstate.sentkexinit) { |
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431 /* we need to send a kex packet */ |
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432 send_msg_kexinit(); |
|
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433 TRACE(("continue recv_msg_kexinit: sent kexinit")) |
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434 } |
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435 |
|
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436 /* start the kex hash */ |
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437 local_ident_len = strlen(LOCAL_IDENT); |
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438 remote_ident_len = strlen((char*)ses.remoteident); |
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439 |
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440 kexhashbuf_len = local_ident_len + remote_ident_len |
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441 + ses.transkexinit->len + ses.payload->len |
|
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442 + KEXHASHBUF_MAX_INTS; |
|
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443 |
|
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444 ses.kexhashbuf = buf_new(kexhashbuf_len); |
|
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445 |
|
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446 if (IS_DROPBEAR_CLIENT) { |
|
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447 |
| 26 | 448 /* read the peer's choice of algos */ |
| 33 | 449 read_kex_algos(); |
|
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450 |
| 26 | 451 /* V_C, the client's version string (CR and NL excluded) */ |
|
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452 buf_putstring(ses.kexhashbuf, |
|
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453 (unsigned char*)LOCAL_IDENT, local_ident_len); |
| 26 | 454 /* V_S, the server's version string (CR and NL excluded) */ |
|
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455 buf_putstring(ses.kexhashbuf, ses.remoteident, remote_ident_len); |
|
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456 |
| 26 | 457 /* I_C, the payload of the client's SSH_MSG_KEXINIT */ |
|
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|
458 buf_putstring(ses.kexhashbuf, |
|
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459 ses.transkexinit->data, ses.transkexinit->len); |
| 26 | 460 /* I_S, the payload of the server's SSH_MSG_KEXINIT */ |
|
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461 buf_setpos(ses.payload, 0); |
|
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462 buf_putstring(ses.kexhashbuf, ses.payload->data, ses.payload->len); |
|
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463 |
|
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464 } else { |
| 26 | 465 /* SERVER */ |
|
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466 |
| 26 | 467 /* read the peer's choice of algos */ |
| 33 | 468 read_kex_algos(); |
| 26 | 469 /* V_C, the client's version string (CR and NL excluded) */ |
|
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470 buf_putstring(ses.kexhashbuf, ses.remoteident, remote_ident_len); |
| 26 | 471 /* V_S, the server's version string (CR and NL excluded) */ |
|
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472 buf_putstring(ses.kexhashbuf, |
|
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473 (unsigned char*)LOCAL_IDENT, local_ident_len); |
|
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474 |
| 26 | 475 /* I_C, the payload of the client's SSH_MSG_KEXINIT */ |
|
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476 buf_setpos(ses.payload, 0); |
|
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477 buf_putstring(ses.kexhashbuf, ses.payload->data, ses.payload->len); |
|
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478 |
| 26 | 479 /* I_S, the payload of the server's SSH_MSG_KEXINIT */ |
|
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|
480 buf_putstring(ses.kexhashbuf, |
|
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481 ses.transkexinit->data, ses.transkexinit->len); |
|
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482 |
| 26 | 483 ses.requirenext = SSH_MSG_KEXDH_INIT; |
|
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484 } |
|
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|
485 |
|
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|
486 buf_free(ses.transkexinit); |
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487 ses.transkexinit = NULL; |
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|
488 /* the rest of ses.kexhashbuf will be done after DH exchange */ |
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|
489 |
|
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|
490 ses.kexstate.recvkexinit = 1; |
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491 |
|
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|
492 TRACE(("leave recv_msg_kexinit")) |
|
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|
493 } |
|
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|
494 |
| 26 | 495 /* Initialises and generate one side of the diffie-hellman key exchange values. |
| 496 * See the ietf-secsh-transport draft, section 6, for details */ | |
|
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|
497 /* dh_pub and dh_priv MUST be already initialised */ |
| 26 | 498 void gen_kexdh_vals(mp_int *dh_pub, mp_int *dh_priv) { |
| 499 | |
|
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500 DEF_MP_INT(dh_p); |
|
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default initialisers for mp_ints
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|
501 DEF_MP_INT(dh_q); |
|
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diff
changeset
|
502 DEF_MP_INT(dh_g); |
| 26 | 503 |
|
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Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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changeset
|
504 TRACE(("enter send_msg_kexdh_reply")) |
| 26 | 505 |
|
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default initialisers for mp_ints
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diff
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|
506 m_mp_init_multi(&dh_g, &dh_p, &dh_q, NULL); |
| 26 | 507 |
| 508 /* read the prime and generator*/ | |
|
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- refactored random mp_int generation and byte->mp_int code
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|
509 bytes_to_mp(&dh_p, (unsigned char*)dh_p_val, DH_P_LEN); |
| 26 | 510 |
| 511 if (mp_set_int(&dh_g, DH_G_VAL) != MP_OKAY) { | |
| 512 dropbear_exit("Diffie-Hellman error"); | |
| 513 } | |
| 514 | |
| 515 /* calculate q = (p-1)/2 */ | |
| 516 /* dh_priv is just a temp var here */ | |
| 517 if (mp_sub_d(&dh_p, 1, dh_priv) != MP_OKAY) { | |
| 518 dropbear_exit("Diffie-Hellman error"); | |
| 519 } | |
| 520 if (mp_div_2(dh_priv, &dh_q) != MP_OKAY) { | |
| 521 dropbear_exit("Diffie-Hellman error"); | |
| 522 } | |
| 523 | |
|
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- refactored random mp_int generation and byte->mp_int code
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changeset
|
524 /* Generate a private portion 0 < dh_priv < dh_q */ |
|
c9483550701b
- refactored random mp_int generation and byte->mp_int code
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diff
changeset
|
525 gen_random_mpint(&dh_q, dh_priv); |
| 26 | 526 |
| 527 /* f = g^y mod p */ | |
| 528 if (mp_exptmod(&dh_g, dh_priv, &dh_p, dh_pub) != MP_OKAY) { | |
| 529 dropbear_exit("Diffie-Hellman error"); | |
| 530 } | |
| 531 mp_clear_multi(&dh_g, &dh_p, &dh_q, NULL); | |
| 532 } | |
| 533 | |
| 534 /* This function is fairly common between client/server, with some substitution | |
| 535 * of dh_e/dh_f etc. Hence these arguments: | |
| 536 * dh_pub_us is 'e' for the client, 'f' for the server. dh_pub_them is | |
| 537 * vice-versa. dh_priv is the x/y value corresponding to dh_pub_us */ | |
| 538 void kexdh_comb_key(mp_int *dh_pub_us, mp_int *dh_priv, mp_int *dh_pub_them, | |
| 539 sign_key *hostkey) { | |
| 540 | |
| 541 mp_int dh_p; | |
| 542 mp_int *dh_e = NULL, *dh_f = NULL; | |
| 543 hash_state hs; | |
| 544 | |
| 545 /* read the prime and generator*/ | |
| 342 | 546 m_mp_init(&dh_p); |
|
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- refactored random mp_int generation and byte->mp_int code
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diff
changeset
|
547 bytes_to_mp(&dh_p, dh_p_val, DH_P_LEN); |
| 26 | 548 |
| 549 /* Check that dh_pub_them (dh_e or dh_f) is in the range [1, p-1] */ | |
| 550 if (mp_cmp(dh_pub_them, &dh_p) != MP_LT | |
| 551 || mp_cmp_d(dh_pub_them, 0) != MP_GT) { | |
| 552 dropbear_exit("Diffie-Hellman error"); | |
| 553 } | |
| 554 | |
| 555 /* K = e^y mod p = f^x mod p */ | |
| 556 ses.dh_K = (mp_int*)m_malloc(sizeof(mp_int)); | |
| 557 m_mp_init(ses.dh_K); | |
| 558 if (mp_exptmod(dh_pub_them, dh_priv, &dh_p, ses.dh_K) != MP_OKAY) { | |
| 559 dropbear_exit("Diffie-Hellman error"); | |
| 560 } | |
| 561 | |
| 562 /* clear no longer needed vars */ | |
| 563 mp_clear_multi(&dh_p, NULL); | |
| 564 | |
| 565 /* From here on, the code needs to work with the _same_ vars on each side, | |
| 566 * not vice-versaing for client/server */ | |
| 567 if (IS_DROPBEAR_CLIENT) { | |
| 568 dh_e = dh_pub_us; | |
| 569 dh_f = dh_pub_them; | |
| 570 } else { | |
| 571 dh_e = dh_pub_them; | |
| 572 dh_f = dh_pub_us; | |
| 573 } | |
| 574 | |
| 575 /* Create the remainder of the hash buffer, to generate the exchange hash */ | |
| 576 /* K_S, the host key */ | |
| 577 buf_put_pub_key(ses.kexhashbuf, hostkey, ses.newkeys->algo_hostkey); | |
| 578 /* e, exchange value sent by the client */ | |
| 579 buf_putmpint(ses.kexhashbuf, dh_e); | |
| 580 /* f, exchange value sent by the server */ | |
| 581 buf_putmpint(ses.kexhashbuf, dh_f); | |
| 582 /* K, the shared secret */ | |
| 583 buf_putmpint(ses.kexhashbuf, ses.dh_K); | |
| 584 | |
| 585 /* calculate the hash H to sign */ | |
| 586 sha1_init(&hs); | |
| 587 buf_setpos(ses.kexhashbuf, 0); | |
| 588 sha1_process(&hs, buf_getptr(ses.kexhashbuf, ses.kexhashbuf->len), | |
| 589 ses.kexhashbuf->len); | |
| 590 sha1_done(&hs, ses.hash); | |
|
35
0ad5fb979f42
set the isserver flag (oops)
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diff
changeset
|
591 |
|
0ad5fb979f42
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diff
changeset
|
592 buf_burn(ses.kexhashbuf); |
| 26 | 593 buf_free(ses.kexhashbuf); |
| 594 ses.kexhashbuf = NULL; | |
| 595 | |
| 596 /* first time around, we set the session_id to H */ | |
| 597 if (ses.session_id == NULL) { | |
| 598 /* create the session_id, this never needs freeing */ | |
| 599 ses.session_id = (unsigned char*)m_malloc(SHA1_HASH_SIZE); | |
| 600 memcpy(ses.session_id, ses.hash, SHA1_HASH_SIZE); | |
| 601 } | |
| 602 } | |
| 603 | |
| 604 /* read the other side's algo list. buf_match_algo is a callback to match | |
| 605 * algos for the client or server. */ | |
| 33 | 606 static void read_kex_algos() { |
| 26 | 607 |
|
36
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Handle differing c2s and s2c algorithms properly
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diff
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|
608 /* for asymmetry */ |
|
a600c015562d
Handle differing c2s and s2c algorithms properly
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diff
changeset
|
609 algo_type * c2s_hash_algo = NULL; |
|
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Handle differing c2s and s2c algorithms properly
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diff
changeset
|
610 algo_type * s2c_hash_algo = NULL; |
|
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
611 algo_type * c2s_cipher_algo = NULL; |
|
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
|
612 algo_type * s2c_cipher_algo = NULL; |
|
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
613 algo_type * c2s_comp_algo = NULL; |
|
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
614 algo_type * s2c_comp_algo = NULL; |
|
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
615 /* the generic one */ |
|
a600c015562d
Handle differing c2s and s2c algorithms properly
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diff
changeset
|
616 algo_type * algo = NULL; |
|
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Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
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35
diff
changeset
|
617 |
|
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
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35
diff
changeset
|
618 /* which algo couldn't match */ |
| 26 | 619 char * erralgo = NULL; |
| 620 | |
| 621 int goodguess = 0; | |
| 622 int allgood = 1; /* we AND this with each goodguess and see if its still | |
| 623 true after */ | |
| 624 | |
| 625 buf_incrpos(ses.payload, 16); /* start after the cookie */ | |
| 626 | |
| 627 ses.newkeys = (struct key_context*)m_malloc(sizeof(struct key_context)); | |
| 628 | |
| 629 /* kex_algorithms */ | |
| 33 | 630 algo = ses.buf_match_algo(ses.payload, sshkex, &goodguess); |
| 26 | 631 allgood &= goodguess; |
| 632 if (algo == NULL) { | |
| 633 erralgo = "kex"; | |
| 634 goto error; | |
| 635 } | |
|
165
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Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
116
diff
changeset
|
636 TRACE(("kex algo %s", algo->name)) |
| 26 | 637 ses.newkeys->algo_kex = algo->val; |
| 638 | |
| 639 /* server_host_key_algorithms */ | |
| 33 | 640 algo = ses.buf_match_algo(ses.payload, sshhostkey, &goodguess); |
| 26 | 641 allgood &= goodguess; |
| 642 if (algo == NULL) { | |
| 643 erralgo = "hostkey"; | |
| 644 goto error; | |
| 645 } | |
|
165
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Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
116
diff
changeset
|
646 TRACE(("hostkey algo %s", algo->name)) |
| 26 | 647 ses.newkeys->algo_hostkey = algo->val; |
| 648 | |
| 649 /* encryption_algorithms_client_to_server */ | |
|
36
a600c015562d
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Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
650 c2s_cipher_algo = ses.buf_match_algo(ses.payload, sshciphers, &goodguess); |
|
116
2010f4119c1a
Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents:
84
diff
changeset
|
651 if (c2s_cipher_algo == NULL) { |
| 26 | 652 erralgo = "enc c->s"; |
| 653 goto error; | |
| 654 } | |
|
228
5e4110bb753a
- Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents:
227
diff
changeset
|
655 TRACE(("enc c2s is %s", c2s_cipher_algo->name)) |
| 26 | 656 |
| 657 /* encryption_algorithms_server_to_client */ | |
|
36
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
658 s2c_cipher_algo = ses.buf_match_algo(ses.payload, sshciphers, &goodguess); |
|
116
2010f4119c1a
Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents:
84
diff
changeset
|
659 if (s2c_cipher_algo == NULL) { |
| 26 | 660 erralgo = "enc s->c"; |
| 661 goto error; | |
| 662 } | |
|
228
5e4110bb753a
- Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents:
227
diff
changeset
|
663 TRACE(("enc s2c is %s", s2c_cipher_algo->name)) |
| 26 | 664 |
| 665 /* mac_algorithms_client_to_server */ | |
|
36
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
666 c2s_hash_algo = ses.buf_match_algo(ses.payload, sshhashes, &goodguess); |
|
116
2010f4119c1a
Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents:
84
diff
changeset
|
667 if (c2s_hash_algo == NULL) { |
| 26 | 668 erralgo = "mac c->s"; |
| 669 goto error; | |
| 670 } | |
|
228
5e4110bb753a
- Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents:
227
diff
changeset
|
671 TRACE(("hash c2s is %s", c2s_hash_algo->name)) |
| 26 | 672 |
| 673 /* mac_algorithms_server_to_client */ | |
|
36
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
674 s2c_hash_algo = ses.buf_match_algo(ses.payload, sshhashes, &goodguess); |
|
116
2010f4119c1a
Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents:
84
diff
changeset
|
675 if (s2c_hash_algo == NULL) { |
| 26 | 676 erralgo = "mac s->c"; |
| 677 goto error; | |
| 678 } | |
|
228
5e4110bb753a
- Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents:
227
diff
changeset
|
679 TRACE(("hash s2c is %s", s2c_hash_algo->name)) |
| 26 | 680 |
| 681 /* compression_algorithms_client_to_server */ | |
|
575
f9b5dc0cba61
- Disable compression for non-final multihops
Matt Johnston <matt@ucc.asn.au>
parents:
555
diff
changeset
|
682 c2s_comp_algo = ses.buf_match_algo(ses.payload, ses.compress_algos, &goodguess); |
|
116
2010f4119c1a
Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents:
84
diff
changeset
|
683 if (c2s_comp_algo == NULL) { |
| 26 | 684 erralgo = "comp c->s"; |
| 685 goto error; | |
| 686 } | |
|
228
5e4110bb753a
- Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents:
227
diff
changeset
|
687 TRACE(("hash c2s is %s", c2s_comp_algo->name)) |
| 26 | 688 |
| 689 /* compression_algorithms_server_to_client */ | |
|
575
f9b5dc0cba61
- Disable compression for non-final multihops
Matt Johnston <matt@ucc.asn.au>
parents:
555
diff
changeset
|
690 s2c_comp_algo = ses.buf_match_algo(ses.payload, ses.compress_algos, &goodguess); |
|
116
2010f4119c1a
Check for non-matching algos properly
Matt Johnston <matt@ucc.asn.au>
parents:
84
diff
changeset
|
691 if (s2c_comp_algo == NULL) { |
| 26 | 692 erralgo = "comp s->c"; |
| 693 goto error; | |
| 694 } | |
|
228
5e4110bb753a
- Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents:
227
diff
changeset
|
695 TRACE(("hash s2c is %s", s2c_comp_algo->name)) |
| 26 | 696 |
| 697 /* languages_client_to_server */ | |
| 698 buf_eatstring(ses.payload); | |
| 699 | |
| 700 /* languages_server_to_client */ | |
| 701 buf_eatstring(ses.payload); | |
| 702 | |
| 703 /* first_kex_packet_follows */ | |
|
179
161557a9dde8
* fix longstanding bug with connections being closed on failure to
Matt Johnston <matt@ucc.asn.au>
parents:
165
diff
changeset
|
704 if (buf_getbool(ses.payload)) { |
| 26 | 705 ses.kexstate.firstfollows = 1; |
| 706 /* if the guess wasn't good, we ignore the packet sent */ | |
| 707 if (!allgood) { | |
| 708 ses.ignorenext = 1; | |
| 709 } | |
| 710 } | |
| 711 | |
|
36
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
712 /* Handle the asymmetry */ |
|
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
713 if (IS_DROPBEAR_CLIENT) { |
|
534
0431915df79f
- Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
714 ses.newkeys->recv.algo_crypt = |
|
36
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
715 (struct dropbear_cipher*)s2c_cipher_algo->data; |
|
534
0431915df79f
- Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
716 ses.newkeys->trans.algo_crypt = |
|
36
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
717 (struct dropbear_cipher*)c2s_cipher_algo->data; |
|
534
0431915df79f
- Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
718 ses.newkeys->recv.crypt_mode = |
| 502 | 719 (struct dropbear_cipher_mode*)s2c_cipher_algo->mode; |
|
534
0431915df79f
- Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
720 ses.newkeys->trans.crypt_mode = |
| 502 | 721 (struct dropbear_cipher_mode*)c2s_cipher_algo->mode; |
|
534
0431915df79f
- Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
722 ses.newkeys->recv.algo_mac = |
|
36
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
723 (struct dropbear_hash*)s2c_hash_algo->data; |
|
534
0431915df79f
- Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
724 ses.newkeys->trans.algo_mac = |
|
36
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
725 (struct dropbear_hash*)c2s_hash_algo->data; |
|
534
0431915df79f
- Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
726 ses.newkeys->recv.algo_comp = s2c_comp_algo->val; |
|
0431915df79f
- Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
727 ses.newkeys->trans.algo_comp = c2s_comp_algo->val; |
|
36
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
728 } else { |
|
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
729 /* SERVER */ |
|
534
0431915df79f
- Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
730 ses.newkeys->recv.algo_crypt = |
|
36
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
731 (struct dropbear_cipher*)c2s_cipher_algo->data; |
|
534
0431915df79f
- Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
732 ses.newkeys->trans.algo_crypt = |
|
36
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
733 (struct dropbear_cipher*)s2c_cipher_algo->data; |
|
534
0431915df79f
- Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
734 ses.newkeys->recv.crypt_mode = |
| 502 | 735 (struct dropbear_cipher_mode*)c2s_cipher_algo->mode; |
|
534
0431915df79f
- Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
736 ses.newkeys->trans.crypt_mode = |
| 502 | 737 (struct dropbear_cipher_mode*)s2c_cipher_algo->mode; |
|
534
0431915df79f
- Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
738 ses.newkeys->recv.algo_mac = |
|
36
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
739 (struct dropbear_hash*)c2s_hash_algo->data; |
|
534
0431915df79f
- Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
740 ses.newkeys->trans.algo_mac = |
|
36
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
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741 (struct dropbear_hash*)s2c_hash_algo->data; |
|
534
0431915df79f
- Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
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742 ses.newkeys->recv.algo_comp = c2s_comp_algo->val; |
|
0431915df79f
- Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
743 ses.newkeys->trans.algo_comp = s2c_comp_algo->val; |
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36
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
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744 } |
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a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
745 |
| 26 | 746 /* reserved for future extensions */ |
| 747 buf_getint(ses.payload); | |
| 748 return; | |
| 749 | |
| 750 error: | |
| 751 dropbear_exit("no matching algo %s", erralgo); | |
| 752 } |