Mercurial > dropbear
annotate common-kex.c @ 250:d059b0bb57dd
Forgot to revert echo flag
| author | Matt Johnston <matt@ucc.asn.au> |
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| date | Tue, 20 Sep 2005 17:36:32 +0000 |
| parents | 5e4110bb753a |
| children | 29afa62b5450 63601217f5ab |
| rev | line source |
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1 /* |
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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 |
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37 /* diffie-hellman-group1-sha1 value for p */ |
| 227 | 38 static const unsigned char dh_p_val[] = { |
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39 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2, |
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40 0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1, |
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41 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6, |
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42 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD, |
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43 0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D, |
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44 0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45, |
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45 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9, |
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46 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED, |
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47 0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11, |
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48 0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE6, 0x53, 0x81, |
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49 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; |
| 227 | 50 #define DH_P_LEN sizeof(dh_p_val) |
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51 |
| 227 | 52 static const int DH_G_VAL = 2; |
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53 |
| 33 | 54 static void kexinitialise(); |
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55 void gen_new_keys(); |
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56 #ifndef DISABLE_ZLIB |
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57 static void gen_new_zstreams(); |
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58 #endif |
| 33 | 59 static void read_kex_algos(); |
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60 /* helper function for gen_new_keys */ |
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61 static void hashkeys(unsigned char *out, int outlen, |
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62 const hash_state * hs, unsigned const char X); |
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63 |
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64 |
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65 /* Send our list of algorithms we can use */ |
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66 void send_msg_kexinit() { |
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67 |
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68 CHECKCLEARTOWRITE(); |
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69 buf_putbyte(ses.writepayload, SSH_MSG_KEXINIT); |
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70 |
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71 /* cookie */ |
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72 genrandom(buf_getwriteptr(ses.writepayload, 16), 16); |
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73 buf_incrwritepos(ses.writepayload, 16); |
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74 |
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75 /* kex algos */ |
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76 buf_put_algolist(ses.writepayload, sshkex); |
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77 |
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78 /* server_host_key_algorithms */ |
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79 buf_put_algolist(ses.writepayload, sshhostkey); |
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80 |
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81 /* encryption_algorithms_client_to_server */ |
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82 buf_put_algolist(ses.writepayload, sshciphers); |
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83 |
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84 /* encryption_algorithms_server_to_client */ |
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85 buf_put_algolist(ses.writepayload, sshciphers); |
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86 |
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87 /* mac_algorithms_client_to_server */ |
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88 buf_put_algolist(ses.writepayload, sshhashes); |
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89 |
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90 /* mac_algorithms_server_to_client */ |
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91 buf_put_algolist(ses.writepayload, sshhashes); |
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92 |
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93 /* compression_algorithms_client_to_server */ |
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94 buf_put_algolist(ses.writepayload, sshcompress); |
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95 |
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96 /* compression_algorithms_server_to_client */ |
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97 buf_put_algolist(ses.writepayload, sshcompress); |
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98 |
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99 /* languages_client_to_server */ |
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100 buf_putstring(ses.writepayload, "", 0); |
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101 |
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102 /* languages_server_to_client */ |
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103 buf_putstring(ses.writepayload, "", 0); |
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104 |
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105 /* first_kex_packet_follows - unimplemented for now */ |
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106 buf_putbyte(ses.writepayload, 0x00); |
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107 |
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108 /* reserved unit32 */ |
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109 buf_putint(ses.writepayload, 0); |
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110 |
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111 /* set up transmitted kex packet buffer for hashing. |
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112 * This is freed after the end of the kex */ |
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113 ses.transkexinit = buf_newcopy(ses.writepayload); |
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114 |
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115 encrypt_packet(); |
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116 ses.dataallowed = 0; /* don't send other packets during kex */ |
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117 |
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118 TRACE(("DATAALLOWED=0")) |
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119 TRACE(("-> KEXINIT")) |
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120 ses.kexstate.sentkexinit = 1; |
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121 } |
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122 |
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123 /* *** NOTE regarding (send|recv)_msg_newkeys *** |
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124 * Changed by mihnea from the original kex.c to set dataallowed after a |
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125 * completed key exchange, no matter the order in which it was performed. |
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126 * This enables client mode without affecting server functionality. |
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127 */ |
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128 |
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129 /* Bring new keys into use after a key exchange, and let the client know*/ |
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130 void send_msg_newkeys() { |
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131 |
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132 TRACE(("enter send_msg_newkeys")) |
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133 |
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134 /* generate the kexinit request */ |
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135 CHECKCLEARTOWRITE(); |
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136 buf_putbyte(ses.writepayload, SSH_MSG_NEWKEYS); |
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137 encrypt_packet(); |
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138 |
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139 |
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140 /* set up our state */ |
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141 if (ses.kexstate.recvnewkeys) { |
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142 TRACE(("while RECVNEWKEYS=1")) |
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143 gen_new_keys(); |
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144 kexinitialise(); /* we've finished with this kex */ |
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145 TRACE((" -> DATAALLOWED=1")) |
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146 ses.dataallowed = 1; /* we can send other packets again now */ |
| 33 | 147 ses.kexstate.donefirstkex = 1; |
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148 } else { |
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149 ses.kexstate.sentnewkeys = 1; |
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150 TRACE(("SENTNEWKEYS=1")) |
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151 } |
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152 |
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153 TRACE(("-> MSG_NEWKEYS")) |
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154 TRACE(("leave send_msg_newkeys")) |
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155 } |
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156 |
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157 /* Bring the new keys into use after a key exchange */ |
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158 void recv_msg_newkeys() { |
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159 |
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160 TRACE(("<- MSG_NEWKEYS")) |
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161 TRACE(("enter recv_msg_newkeys")) |
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162 |
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163 /* simply check if we've sent SSH_MSG_NEWKEYS, and if so, |
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164 * switch to the new keys */ |
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165 if (ses.kexstate.sentnewkeys) { |
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166 TRACE(("while SENTNEWKEYS=1")) |
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167 gen_new_keys(); |
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168 kexinitialise(); /* we've finished with this kex */ |
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169 TRACE((" -> DATAALLOWED=1")) |
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170 ses.dataallowed = 1; /* we can send other packets again now */ |
| 33 | 171 ses.kexstate.donefirstkex = 1; |
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172 } else { |
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173 TRACE(("RECVNEWKEYS=1")) |
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174 ses.kexstate.recvnewkeys = 1; |
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175 } |
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176 |
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177 TRACE(("leave recv_msg_newkeys")) |
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178 } |
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179 |
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180 |
| 33 | 181 /* Set up the kex for the first time */ |
| 182 void kexfirstinitialise() { | |
| 183 | |
| 184 ses.kexstate.donefirstkex = 0; | |
| 185 kexinitialise(); | |
| 186 } | |
| 187 | |
| 188 /* Reset the kex state, ready for a new negotiation */ | |
| 189 static void kexinitialise() { | |
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190 |
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191 struct timeval tv; |
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192 |
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193 TRACE(("kexinitialise()")) |
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194 |
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195 /* sent/recv'd MSG_KEXINIT */ |
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196 ses.kexstate.sentkexinit = 0; |
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197 ses.kexstate.recvkexinit = 0; |
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198 |
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199 /* sent/recv'd MSG_NEWKEYS */ |
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200 ses.kexstate.recvnewkeys = 0; |
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201 ses.kexstate.sentnewkeys = 0; |
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202 |
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203 /* first_packet_follows */ |
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204 ses.kexstate.firstfollows = 0; |
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205 |
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206 ses.kexstate.datatrans = 0; |
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207 ses.kexstate.datarecv = 0; |
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208 |
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209 if (gettimeofday(&tv, 0) < 0) { |
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210 dropbear_exit("Error getting time"); |
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211 } |
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212 ses.kexstate.lastkextime = tv.tv_sec; |
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213 |
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214 } |
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215 |
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216 /* Helper function for gen_new_keys, creates a hash. It makes a copy of the |
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217 * already initialised hash_state hs, which should already have processed |
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218 * the dh_K and hash, since these are common. X is the letter 'A', 'B' etc. |
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219 * out must have at least min(SHA1_HASH_SIZE, outlen) bytes allocated. |
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220 * The output will only be expanded once, since that is all that is required |
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221 * (for 3DES and SHA, with 24 and 20 bytes respectively). |
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222 * |
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223 * See Section 5.2 of the IETF secsh Transport Draft for details */ |
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224 |
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225 /* Duplicated verbatim from kex.c --mihnea */ |
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226 static void hashkeys(unsigned char *out, int outlen, |
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227 const hash_state * hs, const unsigned char X) { |
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228 |
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229 hash_state hs2; |
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230 unsigned char k2[SHA1_HASH_SIZE]; /* used to extending */ |
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231 |
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232 memcpy(&hs2, hs, sizeof(hash_state)); |
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233 sha1_process(&hs2, &X, 1); |
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234 sha1_process(&hs2, ses.session_id, SHA1_HASH_SIZE); |
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235 sha1_done(&hs2, out); |
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236 if (SHA1_HASH_SIZE < outlen) { |
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237 /* need to extend */ |
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238 memcpy(&hs2, hs, sizeof(hash_state)); |
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239 sha1_process(&hs2, out, SHA1_HASH_SIZE); |
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240 sha1_done(&hs2, k2); |
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241 memcpy(&out[SHA1_HASH_SIZE], k2, outlen - SHA1_HASH_SIZE); |
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242 } |
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243 } |
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244 |
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245 /* Generate the actual encryption/integrity keys, using the results of the |
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246 * key exchange, as specified in section 5.2 of the IETF secsh-transport |
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247 * draft. This occurs after the DH key-exchange. |
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248 * |
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249 * ses.newkeys is the new set of keys which are generated, these are only |
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250 * taken into use after both sides have sent a newkeys message */ |
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251 |
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252 /* Originally from kex.c, generalized for cli/svr mode --mihnea */ |
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253 void gen_new_keys() { |
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254 |
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255 unsigned char C2S_IV[MAX_IV_LEN]; |
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256 unsigned char C2S_key[MAX_KEY_LEN]; |
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257 unsigned char S2C_IV[MAX_IV_LEN]; |
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258 unsigned char S2C_key[MAX_KEY_LEN]; |
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259 /* unsigned char key[MAX_KEY_LEN]; */ |
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260 unsigned char *trans_IV, *trans_key, *recv_IV, *recv_key; |
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261 |
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262 hash_state hs; |
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263 unsigned int C2S_keysize, S2C_keysize; |
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264 char mactransletter, macrecvletter; /* Client or server specific */ |
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265 |
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266 TRACE(("enter gen_new_keys")) |
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267 /* the dh_K and hash are the start of all hashes, we make use of that */ |
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268 |
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269 sha1_init(&hs); |
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270 sha1_process_mp(&hs, ses.dh_K); |
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271 mp_clear(ses.dh_K); |
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272 m_free(ses.dh_K); |
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273 sha1_process(&hs, ses.hash, SHA1_HASH_SIZE); |
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274 m_burn(ses.hash, SHA1_HASH_SIZE); |
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275 |
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276 if (IS_DROPBEAR_CLIENT) { |
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277 trans_IV = C2S_IV; |
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278 recv_IV = S2C_IV; |
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279 trans_key = C2S_key; |
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280 recv_key = S2C_key; |
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281 C2S_keysize = ses.newkeys->trans_algo_crypt->keysize; |
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282 S2C_keysize = ses.newkeys->recv_algo_crypt->keysize; |
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283 mactransletter = 'E'; |
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284 macrecvletter = 'F'; |
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285 } else { |
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286 trans_IV = S2C_IV; |
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287 recv_IV = C2S_IV; |
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288 trans_key = S2C_key; |
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289 recv_key = C2S_key; |
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290 C2S_keysize = ses.newkeys->recv_algo_crypt->keysize; |
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291 S2C_keysize = ses.newkeys->trans_algo_crypt->keysize; |
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292 mactransletter = 'F'; |
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293 macrecvletter = 'E'; |
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294 } |
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295 |
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296 hashkeys(C2S_IV, SHA1_HASH_SIZE, &hs, 'A'); |
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297 hashkeys(S2C_IV, SHA1_HASH_SIZE, &hs, 'B'); |
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298 hashkeys(C2S_key, C2S_keysize, &hs, 'C'); |
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299 hashkeys(S2C_key, S2C_keysize, &hs, 'D'); |
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300 |
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301 if (cbc_start( |
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302 find_cipher(ses.newkeys->recv_algo_crypt->cipherdesc->name), |
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303 recv_IV, recv_key, |
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304 ses.newkeys->recv_algo_crypt->keysize, 0, |
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305 &ses.newkeys->recv_symmetric_struct) != CRYPT_OK) { |
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306 dropbear_exit("crypto error"); |
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307 } |
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308 |
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309 if (cbc_start( |
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310 find_cipher(ses.newkeys->trans_algo_crypt->cipherdesc->name), |
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311 trans_IV, trans_key, |
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312 ses.newkeys->trans_algo_crypt->keysize, 0, |
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313 &ses.newkeys->trans_symmetric_struct) != CRYPT_OK) { |
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314 dropbear_exit("crypto error"); |
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315 } |
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316 |
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317 /* MAC keys */ |
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318 hashkeys(ses.newkeys->transmackey, |
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319 ses.newkeys->trans_algo_mac->keysize, &hs, mactransletter); |
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320 hashkeys(ses.newkeys->recvmackey, |
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321 ses.newkeys->recv_algo_mac->keysize, &hs, macrecvletter); |
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322 |
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323 #ifndef DISABLE_ZLIB |
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324 gen_new_zstreams(); |
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325 #endif |
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326 |
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327 /* Switch over to the new keys */ |
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328 m_burn(ses.keys, sizeof(struct key_context)); |
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329 m_free(ses.keys); |
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330 ses.keys = ses.newkeys; |
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331 ses.newkeys = NULL; |
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332 |
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333 TRACE(("leave gen_new_keys")) |
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334 } |
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335 |
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336 #ifndef DISABLE_ZLIB |
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337 /* Set up new zlib compression streams, close the old ones. Only |
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338 * called from gen_new_keys() */ |
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339 static void gen_new_zstreams() { |
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340 |
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341 /* create new zstreams */ |
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342 if (ses.newkeys->recv_algo_comp == DROPBEAR_COMP_ZLIB) { |
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343 ses.newkeys->recv_zstream = (z_streamp)m_malloc(sizeof(z_stream)); |
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344 ses.newkeys->recv_zstream->zalloc = Z_NULL; |
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345 ses.newkeys->recv_zstream->zfree = Z_NULL; |
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346 |
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347 if (inflateInit(ses.newkeys->recv_zstream) != Z_OK) { |
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348 dropbear_exit("zlib error"); |
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349 } |
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350 } else { |
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351 ses.newkeys->recv_zstream = NULL; |
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352 } |
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353 |
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354 if (ses.newkeys->trans_algo_comp == DROPBEAR_COMP_ZLIB) { |
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355 ses.newkeys->trans_zstream = (z_streamp)m_malloc(sizeof(z_stream)); |
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356 ses.newkeys->trans_zstream->zalloc = Z_NULL; |
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357 ses.newkeys->trans_zstream->zfree = Z_NULL; |
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358 |
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359 if (deflateInit(ses.newkeys->trans_zstream, Z_DEFAULT_COMPRESSION) |
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360 != Z_OK) { |
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361 dropbear_exit("zlib error"); |
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362 } |
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363 } else { |
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364 ses.newkeys->trans_zstream = NULL; |
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365 } |
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366 |
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367 /* clean up old keys */ |
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368 if (ses.keys->recv_zstream != NULL) { |
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369 if (inflateEnd(ses.keys->recv_zstream) == Z_STREAM_ERROR) { |
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370 /* Z_DATA_ERROR is ok, just means that stream isn't ended */ |
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371 dropbear_exit("crypto error"); |
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372 } |
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373 m_free(ses.keys->recv_zstream); |
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374 } |
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375 if (ses.keys->trans_zstream != NULL) { |
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376 if (deflateEnd(ses.keys->trans_zstream) == Z_STREAM_ERROR) { |
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377 /* Z_DATA_ERROR is ok, just means that stream isn't ended */ |
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378 dropbear_exit("crypto error"); |
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379 } |
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380 m_free(ses.keys->trans_zstream); |
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381 } |
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382 } |
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383 #endif |
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384 |
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385 |
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386 /* Executed upon receiving a kexinit message from the client to initiate |
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387 * key exchange. If we haven't already done so, we send the list of our |
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388 * preferred algorithms. The client's requested algorithms are processed, |
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389 * and we calculate the first portion of the key-exchange-hash for used |
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390 * later in the key exchange. No response is sent, as the client should |
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391 * initiate the diffie-hellman key exchange */ |
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392 |
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393 /* Originally from kex.c, generalized for cli/svr mode --mihnea */ |
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394 /* Belongs in common_kex.c where it should be moved after review */ |
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395 void recv_msg_kexinit() { |
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396 |
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397 TRACE(("<- KEXINIT")) |
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398 TRACE(("enter recv_msg_kexinit")) |
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399 |
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400 /* start the kex hash */ |
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401 ses.kexhashbuf = buf_new(MAX_KEXHASHBUF); |
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402 |
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403 if (!ses.kexstate.sentkexinit) { |
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404 /* we need to send a kex packet */ |
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405 send_msg_kexinit(); |
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406 TRACE(("continue recv_msg_kexinit: sent kexinit")) |
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407 } |
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408 |
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409 |
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410 if (IS_DROPBEAR_CLIENT) { |
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411 |
| 26 | 412 /* read the peer's choice of algos */ |
| 33 | 413 read_kex_algos(); |
|
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414 |
| 26 | 415 /* V_C, the client's version string (CR and NL excluded) */ |
|
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416 buf_putstring(ses.kexhashbuf, |
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417 (unsigned char*)LOCAL_IDENT, strlen(LOCAL_IDENT)); |
| 26 | 418 /* V_S, the server's version string (CR and NL excluded) */ |
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419 buf_putstring(ses.kexhashbuf, |
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420 ses.remoteident, strlen((char*)ses.remoteident)); |
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421 |
| 26 | 422 /* I_C, the payload of the client's SSH_MSG_KEXINIT */ |
|
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423 buf_putstring(ses.kexhashbuf, |
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424 buf_getptr(ses.transkexinit, ses.transkexinit->len), |
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425 ses.transkexinit->len); |
| 26 | 426 /* I_S, the payload of the server's SSH_MSG_KEXINIT */ |
|
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427 buf_setpos(ses.payload, 0); |
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428 buf_putstring(ses.kexhashbuf, |
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429 buf_getptr(ses.payload, ses.payload->len), |
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430 ses.payload->len); |
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431 |
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432 } else { |
| 26 | 433 /* SERVER */ |
|
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434 |
| 26 | 435 /* read the peer's choice of algos */ |
| 33 | 436 read_kex_algos(); |
| 26 | 437 /* V_C, the client's version string (CR and NL excluded) */ |
|
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438 buf_putstring(ses.kexhashbuf, |
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439 ses.remoteident, strlen((char*)ses.remoteident)); |
| 26 | 440 /* V_S, the server's version string (CR and NL excluded) */ |
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441 buf_putstring(ses.kexhashbuf, |
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442 (unsigned char*)LOCAL_IDENT, strlen(LOCAL_IDENT)); |
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443 |
| 26 | 444 /* I_C, the payload of the client's SSH_MSG_KEXINIT */ |
|
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445 buf_setpos(ses.payload, 0); |
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446 buf_putstring(ses.kexhashbuf, |
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447 buf_getptr(ses.payload, ses.payload->len), |
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448 ses.payload->len); |
| 26 | 449 /* I_S, the payload of the server's SSH_MSG_KEXINIT */ |
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450 buf_putstring(ses.kexhashbuf, |
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451 buf_getptr(ses.transkexinit, ses.transkexinit->len), |
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452 ses.transkexinit->len); |
| 26 | 453 ses.requirenext = SSH_MSG_KEXDH_INIT; |
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454 } |
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455 |
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456 buf_free(ses.transkexinit); |
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457 ses.transkexinit = NULL; |
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458 /* the rest of ses.kexhashbuf will be done after DH exchange */ |
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459 |
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460 ses.kexstate.recvkexinit = 1; |
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461 |
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462 TRACE(("leave recv_msg_kexinit")) |
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463 } |
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464 |
| 26 | 465 /* Initialises and generate one side of the diffie-hellman key exchange values. |
| 466 * See the ietf-secsh-transport draft, section 6, for details */ | |
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467 /* dh_pub and dh_priv MUST be already initialised */ |
| 26 | 468 void gen_kexdh_vals(mp_int *dh_pub, mp_int *dh_priv) { |
| 469 | |
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470 DEF_MP_INT(dh_p); |
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471 DEF_MP_INT(dh_q); |
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472 DEF_MP_INT(dh_g); |
| 26 | 473 |
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474 TRACE(("enter send_msg_kexdh_reply")) |
| 26 | 475 |
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476 m_mp_init_multi(&dh_g, &dh_p, &dh_q, NULL); |
| 26 | 477 |
| 478 /* read the prime and generator*/ | |
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479 bytes_to_mp(&dh_p, (unsigned char*)dh_p_val, DH_P_LEN); |
| 26 | 480 |
| 481 if (mp_set_int(&dh_g, DH_G_VAL) != MP_OKAY) { | |
| 482 dropbear_exit("Diffie-Hellman error"); | |
| 483 } | |
| 484 | |
| 485 /* calculate q = (p-1)/2 */ | |
| 486 /* dh_priv is just a temp var here */ | |
| 487 if (mp_sub_d(&dh_p, 1, dh_priv) != MP_OKAY) { | |
| 488 dropbear_exit("Diffie-Hellman error"); | |
| 489 } | |
| 490 if (mp_div_2(dh_priv, &dh_q) != MP_OKAY) { | |
| 491 dropbear_exit("Diffie-Hellman error"); | |
| 492 } | |
| 493 | |
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494 /* Generate a private portion 0 < dh_priv < dh_q */ |
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495 gen_random_mpint(&dh_q, dh_priv); |
| 26 | 496 |
| 497 /* f = g^y mod p */ | |
| 498 if (mp_exptmod(&dh_g, dh_priv, &dh_p, dh_pub) != MP_OKAY) { | |
| 499 dropbear_exit("Diffie-Hellman error"); | |
| 500 } | |
| 501 mp_clear_multi(&dh_g, &dh_p, &dh_q, NULL); | |
| 502 } | |
| 503 | |
| 504 /* This function is fairly common between client/server, with some substitution | |
| 505 * of dh_e/dh_f etc. Hence these arguments: | |
| 506 * dh_pub_us is 'e' for the client, 'f' for the server. dh_pub_them is | |
| 507 * vice-versa. dh_priv is the x/y value corresponding to dh_pub_us */ | |
| 508 void kexdh_comb_key(mp_int *dh_pub_us, mp_int *dh_priv, mp_int *dh_pub_them, | |
| 509 sign_key *hostkey) { | |
| 510 | |
| 511 mp_int dh_p; | |
| 512 mp_int *dh_e = NULL, *dh_f = NULL; | |
| 513 hash_state hs; | |
| 514 | |
| 515 /* read the prime and generator*/ | |
| 516 mp_init(&dh_p); | |
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517 bytes_to_mp(&dh_p, dh_p_val, DH_P_LEN); |
| 26 | 518 |
| 519 /* Check that dh_pub_them (dh_e or dh_f) is in the range [1, p-1] */ | |
| 520 if (mp_cmp(dh_pub_them, &dh_p) != MP_LT | |
| 521 || mp_cmp_d(dh_pub_them, 0) != MP_GT) { | |
| 522 dropbear_exit("Diffie-Hellman error"); | |
| 523 } | |
| 524 | |
| 525 /* K = e^y mod p = f^x mod p */ | |
| 526 ses.dh_K = (mp_int*)m_malloc(sizeof(mp_int)); | |
| 527 m_mp_init(ses.dh_K); | |
| 528 if (mp_exptmod(dh_pub_them, dh_priv, &dh_p, ses.dh_K) != MP_OKAY) { | |
| 529 dropbear_exit("Diffie-Hellman error"); | |
| 530 } | |
| 531 | |
| 532 /* clear no longer needed vars */ | |
| 533 mp_clear_multi(&dh_p, NULL); | |
| 534 | |
| 535 /* From here on, the code needs to work with the _same_ vars on each side, | |
| 536 * not vice-versaing for client/server */ | |
| 537 if (IS_DROPBEAR_CLIENT) { | |
| 538 dh_e = dh_pub_us; | |
| 539 dh_f = dh_pub_them; | |
| 540 } else { | |
| 541 dh_e = dh_pub_them; | |
| 542 dh_f = dh_pub_us; | |
| 543 } | |
| 544 | |
| 545 /* Create the remainder of the hash buffer, to generate the exchange hash */ | |
| 546 /* K_S, the host key */ | |
| 547 buf_put_pub_key(ses.kexhashbuf, hostkey, ses.newkeys->algo_hostkey); | |
| 548 /* e, exchange value sent by the client */ | |
| 549 buf_putmpint(ses.kexhashbuf, dh_e); | |
| 550 /* f, exchange value sent by the server */ | |
| 551 buf_putmpint(ses.kexhashbuf, dh_f); | |
| 552 /* K, the shared secret */ | |
| 553 buf_putmpint(ses.kexhashbuf, ses.dh_K); | |
| 554 | |
| 555 /* calculate the hash H to sign */ | |
| 556 sha1_init(&hs); | |
| 557 buf_setpos(ses.kexhashbuf, 0); | |
| 558 sha1_process(&hs, buf_getptr(ses.kexhashbuf, ses.kexhashbuf->len), | |
| 559 ses.kexhashbuf->len); | |
| 560 sha1_done(&hs, ses.hash); | |
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561 |
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562 buf_burn(ses.kexhashbuf); |
| 26 | 563 buf_free(ses.kexhashbuf); |
| 564 ses.kexhashbuf = NULL; | |
| 565 | |
| 566 /* first time around, we set the session_id to H */ | |
| 567 if (ses.session_id == NULL) { | |
| 568 /* create the session_id, this never needs freeing */ | |
| 569 ses.session_id = (unsigned char*)m_malloc(SHA1_HASH_SIZE); | |
| 570 memcpy(ses.session_id, ses.hash, SHA1_HASH_SIZE); | |
| 571 } | |
| 572 } | |
| 573 | |
| 574 /* read the other side's algo list. buf_match_algo is a callback to match | |
| 575 * algos for the client or server. */ | |
| 33 | 576 static void read_kex_algos() { |
| 26 | 577 |
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578 /* for asymmetry */ |
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579 algo_type * c2s_hash_algo = NULL; |
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580 algo_type * s2c_hash_algo = NULL; |
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581 algo_type * c2s_cipher_algo = NULL; |
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582 algo_type * s2c_cipher_algo = NULL; |
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583 algo_type * c2s_comp_algo = NULL; |
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584 algo_type * s2c_comp_algo = NULL; |
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585 /* the generic one */ |
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586 algo_type * algo = NULL; |
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587 |
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588 /* which algo couldn't match */ |
| 26 | 589 char * erralgo = NULL; |
| 590 | |
| 591 int goodguess = 0; | |
| 592 int allgood = 1; /* we AND this with each goodguess and see if its still | |
| 593 true after */ | |
| 594 | |
| 595 buf_incrpos(ses.payload, 16); /* start after the cookie */ | |
| 596 | |
| 597 ses.newkeys = (struct key_context*)m_malloc(sizeof(struct key_context)); | |
| 598 | |
| 599 /* kex_algorithms */ | |
| 33 | 600 algo = ses.buf_match_algo(ses.payload, sshkex, &goodguess); |
| 26 | 601 allgood &= goodguess; |
| 602 if (algo == NULL) { | |
| 603 erralgo = "kex"; | |
| 604 goto error; | |
| 605 } | |
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606 TRACE(("kex algo %s", algo->name)) |
| 26 | 607 ses.newkeys->algo_kex = algo->val; |
| 608 | |
| 609 /* server_host_key_algorithms */ | |
| 33 | 610 algo = ses.buf_match_algo(ses.payload, sshhostkey, &goodguess); |
| 26 | 611 allgood &= goodguess; |
| 612 if (algo == NULL) { | |
| 613 erralgo = "hostkey"; | |
| 614 goto error; | |
| 615 } | |
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616 TRACE(("hostkey algo %s", algo->name)) |
| 26 | 617 ses.newkeys->algo_hostkey = algo->val; |
| 618 | |
| 619 /* encryption_algorithms_client_to_server */ | |
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620 c2s_cipher_algo = ses.buf_match_algo(ses.payload, sshciphers, &goodguess); |
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621 if (c2s_cipher_algo == NULL) { |
| 26 | 622 erralgo = "enc c->s"; |
| 623 goto error; | |
| 624 } | |
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625 TRACE(("enc c2s is %s", c2s_cipher_algo->name)) |
| 26 | 626 |
| 627 /* encryption_algorithms_server_to_client */ | |
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628 s2c_cipher_algo = ses.buf_match_algo(ses.payload, sshciphers, &goodguess); |
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629 if (s2c_cipher_algo == NULL) { |
| 26 | 630 erralgo = "enc s->c"; |
| 631 goto error; | |
| 632 } | |
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633 TRACE(("enc s2c is %s", s2c_cipher_algo->name)) |
| 26 | 634 |
| 635 /* mac_algorithms_client_to_server */ | |
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636 c2s_hash_algo = ses.buf_match_algo(ses.payload, sshhashes, &goodguess); |
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637 if (c2s_hash_algo == NULL) { |
| 26 | 638 erralgo = "mac c->s"; |
| 639 goto error; | |
| 640 } | |
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641 TRACE(("hash c2s is %s", c2s_hash_algo->name)) |
| 26 | 642 |
| 643 /* mac_algorithms_server_to_client */ | |
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644 s2c_hash_algo = ses.buf_match_algo(ses.payload, sshhashes, &goodguess); |
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645 if (s2c_hash_algo == NULL) { |
| 26 | 646 erralgo = "mac s->c"; |
| 647 goto error; | |
| 648 } | |
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649 TRACE(("hash s2c is %s", s2c_hash_algo->name)) |
| 26 | 650 |
| 651 /* compression_algorithms_client_to_server */ | |
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652 c2s_comp_algo = ses.buf_match_algo(ses.payload, sshcompress, &goodguess); |
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653 if (c2s_comp_algo == NULL) { |
| 26 | 654 erralgo = "comp c->s"; |
| 655 goto error; | |
| 656 } | |
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657 TRACE(("hash c2s is %s", c2s_comp_algo->name)) |
| 26 | 658 |
| 659 /* compression_algorithms_server_to_client */ | |
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660 s2c_comp_algo = ses.buf_match_algo(ses.payload, sshcompress, &goodguess); |
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661 if (s2c_comp_algo == NULL) { |
| 26 | 662 erralgo = "comp s->c"; |
| 663 goto error; | |
| 664 } | |
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665 TRACE(("hash s2c is %s", s2c_comp_algo->name)) |
| 26 | 666 |
| 667 /* languages_client_to_server */ | |
| 668 buf_eatstring(ses.payload); | |
| 669 | |
| 670 /* languages_server_to_client */ | |
| 671 buf_eatstring(ses.payload); | |
| 672 | |
| 673 /* first_kex_packet_follows */ | |
|
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674 if (buf_getbool(ses.payload)) { |
| 26 | 675 ses.kexstate.firstfollows = 1; |
| 676 /* if the guess wasn't good, we ignore the packet sent */ | |
| 677 if (!allgood) { | |
| 678 ses.ignorenext = 1; | |
| 679 } | |
| 680 } | |
| 681 | |
|
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682 /* Handle the asymmetry */ |
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683 if (IS_DROPBEAR_CLIENT) { |
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684 ses.newkeys->recv_algo_crypt = |
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685 (struct dropbear_cipher*)s2c_cipher_algo->data; |
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686 ses.newkeys->trans_algo_crypt = |
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687 (struct dropbear_cipher*)c2s_cipher_algo->data; |
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688 ses.newkeys->recv_algo_mac = |
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689 (struct dropbear_hash*)s2c_hash_algo->data; |
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690 ses.newkeys->trans_algo_mac = |
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691 (struct dropbear_hash*)c2s_hash_algo->data; |
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692 ses.newkeys->recv_algo_comp = s2c_comp_algo->val; |
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693 ses.newkeys->trans_algo_comp = c2s_comp_algo->val; |
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694 } else { |
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695 /* SERVER */ |
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696 ses.newkeys->recv_algo_crypt = |
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697 (struct dropbear_cipher*)c2s_cipher_algo->data; |
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698 ses.newkeys->trans_algo_crypt = |
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699 (struct dropbear_cipher*)s2c_cipher_algo->data; |
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700 ses.newkeys->recv_algo_mac = |
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701 (struct dropbear_hash*)c2s_hash_algo->data; |
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702 ses.newkeys->trans_algo_mac = |
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703 (struct dropbear_hash*)s2c_hash_algo->data; |
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704 ses.newkeys->recv_algo_comp = c2s_comp_algo->val; |
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705 ses.newkeys->trans_algo_comp = s2c_comp_algo->val; |
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706 } |
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707 |
| 26 | 708 /* reserved for future extensions */ |
| 709 buf_getint(ses.payload); | |
| 710 return; | |
| 711 | |
| 712 error: | |
| 713 dropbear_exit("no matching algo %s", erralgo); | |
| 714 } |