Mercurial > dropbear
annotate common-kex.c @ 197:a6eb598d8686
* change include path for libtomcrypt 1.02
| author | Matt Johnston <matt@ucc.asn.au> |
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| date | Tue, 10 May 2005 17:01:16 +0000 |
| parents | c9483550701b |
| children | ad1b24e39bf3 |
| 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 */ |
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38 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}; |
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50 |
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51 const int DH_G_VAL = 2; |
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52 |
| 33 | 53 static void kexinitialise(); |
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54 void gen_new_keys(); |
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55 #ifndef DISABLE_ZLIB |
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56 static void gen_new_zstreams(); |
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57 #endif |
| 33 | 58 static void read_kex_algos(); |
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59 /* helper function for gen_new_keys */ |
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60 static void hashkeys(unsigned char *out, int outlen, |
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61 const hash_state * hs, unsigned const char X); |
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62 |
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63 |
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64 /* Send our list of algorithms we can use */ |
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65 void send_msg_kexinit() { |
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66 |
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67 CHECKCLEARTOWRITE(); |
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68 buf_putbyte(ses.writepayload, SSH_MSG_KEXINIT); |
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69 |
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70 /* cookie */ |
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71 genrandom(buf_getwriteptr(ses.writepayload, 16), 16); |
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72 buf_incrwritepos(ses.writepayload, 16); |
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73 |
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74 /* kex algos */ |
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75 buf_put_algolist(ses.writepayload, sshkex); |
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76 |
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77 /* server_host_key_algorithms */ |
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78 buf_put_algolist(ses.writepayload, sshhostkey); |
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79 |
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80 /* encryption_algorithms_client_to_server */ |
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81 buf_put_algolist(ses.writepayload, sshciphers); |
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82 |
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83 /* encryption_algorithms_server_to_client */ |
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84 buf_put_algolist(ses.writepayload, sshciphers); |
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85 |
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86 /* mac_algorithms_client_to_server */ |
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87 buf_put_algolist(ses.writepayload, sshhashes); |
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88 |
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89 /* mac_algorithms_server_to_client */ |
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90 buf_put_algolist(ses.writepayload, sshhashes); |
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91 |
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92 /* compression_algorithms_client_to_server */ |
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93 buf_put_algolist(ses.writepayload, sshcompress); |
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94 |
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95 /* compression_algorithms_server_to_client */ |
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96 buf_put_algolist(ses.writepayload, sshcompress); |
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97 |
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98 /* languages_client_to_server */ |
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99 buf_putstring(ses.writepayload, "", 0); |
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100 |
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101 /* languages_server_to_client */ |
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102 buf_putstring(ses.writepayload, "", 0); |
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103 |
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104 /* first_kex_packet_follows - unimplemented for now */ |
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105 buf_putbyte(ses.writepayload, 0x00); |
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106 |
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107 /* reserved unit32 */ |
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108 buf_putint(ses.writepayload, 0); |
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109 |
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110 /* set up transmitted kex packet buffer for hashing. |
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111 * This is freed after the end of the kex */ |
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112 ses.transkexinit = buf_newcopy(ses.writepayload); |
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113 |
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114 encrypt_packet(); |
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115 ses.dataallowed = 0; /* don't send other packets during kex */ |
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116 |
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165
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117 TRACE(("DATAALLOWED=0")) |
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118 TRACE(("-> KEXINIT")) |
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119 ses.kexstate.sentkexinit = 1; |
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120 } |
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121 |
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122 /* *** NOTE regarding (send|recv)_msg_newkeys *** |
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123 * Changed by mihnea from the original kex.c to set dataallowed after a |
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124 * completed key exchange, no matter the order in which it was performed. |
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125 * This enables client mode without affecting server functionality. |
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126 */ |
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127 |
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128 /* Bring new keys into use after a key exchange, and let the client know*/ |
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129 void send_msg_newkeys() { |
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130 |
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131 TRACE(("enter send_msg_newkeys")) |
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132 |
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133 /* generate the kexinit request */ |
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134 CHECKCLEARTOWRITE(); |
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135 buf_putbyte(ses.writepayload, SSH_MSG_NEWKEYS); |
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136 encrypt_packet(); |
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137 |
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138 |
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139 /* set up our state */ |
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140 if (ses.kexstate.recvnewkeys) { |
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141 TRACE(("while RECVNEWKEYS=1")) |
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142 gen_new_keys(); |
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143 kexinitialise(); /* we've finished with this kex */ |
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144 TRACE((" -> DATAALLOWED=1")) |
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145 ses.dataallowed = 1; /* we can send other packets again now */ |
| 33 | 146 ses.kexstate.donefirstkex = 1; |
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147 } else { |
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148 ses.kexstate.sentnewkeys = 1; |
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149 TRACE(("SENTNEWKEYS=1")) |
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150 } |
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151 |
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152 TRACE(("-> MSG_NEWKEYS")) |
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153 TRACE(("leave send_msg_newkeys")) |
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154 } |
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155 |
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156 /* Bring the new keys into use after a key exchange */ |
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157 void recv_msg_newkeys() { |
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158 |
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159 TRACE(("<- MSG_NEWKEYS")) |
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160 TRACE(("enter recv_msg_newkeys")) |
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161 |
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162 /* simply check if we've sent SSH_MSG_NEWKEYS, and if so, |
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163 * switch to the new keys */ |
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164 if (ses.kexstate.sentnewkeys) { |
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165 TRACE(("while SENTNEWKEYS=1")) |
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166 gen_new_keys(); |
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167 kexinitialise(); /* we've finished with this kex */ |
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168 TRACE((" -> DATAALLOWED=1")) |
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169 ses.dataallowed = 1; /* we can send other packets again now */ |
| 33 | 170 ses.kexstate.donefirstkex = 1; |
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171 } else { |
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172 TRACE(("RECVNEWKEYS=1")) |
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173 ses.kexstate.recvnewkeys = 1; |
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174 } |
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175 |
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176 TRACE(("leave recv_msg_newkeys")) |
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177 } |
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178 |
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179 |
| 33 | 180 /* Set up the kex for the first time */ |
| 181 void kexfirstinitialise() { | |
| 182 | |
| 183 ses.kexstate.donefirstkex = 0; | |
| 184 kexinitialise(); | |
| 185 } | |
| 186 | |
| 187 /* Reset the kex state, ready for a new negotiation */ | |
| 188 static void kexinitialise() { | |
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189 |
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190 struct timeval tv; |
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191 |
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192 TRACE(("kexinitialise()")) |
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193 |
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194 /* sent/recv'd MSG_KEXINIT */ |
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195 ses.kexstate.sentkexinit = 0; |
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196 ses.kexstate.recvkexinit = 0; |
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197 |
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198 /* sent/recv'd MSG_NEWKEYS */ |
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199 ses.kexstate.recvnewkeys = 0; |
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200 ses.kexstate.sentnewkeys = 0; |
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201 |
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202 /* first_packet_follows */ |
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203 ses.kexstate.firstfollows = 0; |
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204 |
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205 ses.kexstate.datatrans = 0; |
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206 ses.kexstate.datarecv = 0; |
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207 |
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208 if (gettimeofday(&tv, 0) < 0) { |
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209 dropbear_exit("Error getting time"); |
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210 } |
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211 ses.kexstate.lastkextime = tv.tv_sec; |
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212 |
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213 } |
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214 |
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215 /* Helper function for gen_new_keys, creates a hash. It makes a copy of the |
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216 * already initialised hash_state hs, which should already have processed |
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217 * the dh_K and hash, since these are common. X is the letter 'A', 'B' etc. |
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218 * out must have at least min(SHA1_HASH_SIZE, outlen) bytes allocated. |
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219 * The output will only be expanded once, since that is all that is required |
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220 * (for 3DES and SHA, with 24 and 20 bytes respectively). |
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221 * |
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222 * See Section 5.2 of the IETF secsh Transport Draft for details */ |
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223 |
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224 /* Duplicated verbatim from kex.c --mihnea */ |
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225 static void hashkeys(unsigned char *out, int outlen, |
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226 const hash_state * hs, const unsigned char X) { |
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227 |
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228 hash_state hs2; |
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229 unsigned char k2[SHA1_HASH_SIZE]; /* used to extending */ |
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230 |
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231 memcpy(&hs2, hs, sizeof(hash_state)); |
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232 sha1_process(&hs2, &X, 1); |
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233 sha1_process(&hs2, ses.session_id, SHA1_HASH_SIZE); |
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234 sha1_done(&hs2, out); |
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235 if (SHA1_HASH_SIZE < outlen) { |
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236 /* need to extend */ |
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237 memcpy(&hs2, hs, sizeof(hash_state)); |
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238 sha1_process(&hs2, out, SHA1_HASH_SIZE); |
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239 sha1_done(&hs2, k2); |
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240 memcpy(&out[SHA1_HASH_SIZE], k2, outlen - SHA1_HASH_SIZE); |
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241 } |
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242 } |
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243 |
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244 /* Generate the actual encryption/integrity keys, using the results of the |
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245 * key exchange, as specified in section 5.2 of the IETF secsh-transport |
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246 * draft. This occurs after the DH key-exchange. |
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247 * |
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248 * ses.newkeys is the new set of keys which are generated, these are only |
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249 * taken into use after both sides have sent a newkeys message */ |
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250 |
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251 /* Originally from kex.c, generalized for cli/svr mode --mihnea */ |
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252 void gen_new_keys() { |
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253 |
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254 unsigned char C2S_IV[MAX_IV_LEN]; |
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255 unsigned char C2S_key[MAX_KEY_LEN]; |
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256 unsigned char S2C_IV[MAX_IV_LEN]; |
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257 unsigned char S2C_key[MAX_KEY_LEN]; |
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258 /* unsigned char key[MAX_KEY_LEN]; */ |
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259 unsigned char *trans_IV, *trans_key, *recv_IV, *recv_key; |
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260 |
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261 hash_state hs; |
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262 unsigned int C2S_keysize, S2C_keysize; |
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263 char mactransletter, macrecvletter; /* Client or server specific */ |
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264 |
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265 TRACE(("enter gen_new_keys")) |
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266 /* the dh_K and hash are the start of all hashes, we make use of that */ |
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267 |
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268 sha1_init(&hs); |
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269 sha1_process_mp(&hs, ses.dh_K); |
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270 mp_clear(ses.dh_K); |
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271 m_free(ses.dh_K); |
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272 sha1_process(&hs, ses.hash, SHA1_HASH_SIZE); |
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273 m_burn(ses.hash, SHA1_HASH_SIZE); |
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274 |
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275 if (IS_DROPBEAR_CLIENT) { |
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276 trans_IV = C2S_IV; |
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277 recv_IV = S2C_IV; |
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278 trans_key = C2S_key; |
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279 recv_key = S2C_key; |
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280 C2S_keysize = ses.newkeys->trans_algo_crypt->keysize; |
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281 S2C_keysize = ses.newkeys->recv_algo_crypt->keysize; |
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282 mactransletter = 'E'; |
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283 macrecvletter = 'F'; |
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284 } else { |
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285 trans_IV = S2C_IV; |
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286 recv_IV = C2S_IV; |
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287 trans_key = S2C_key; |
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288 recv_key = C2S_key; |
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289 C2S_keysize = ses.newkeys->recv_algo_crypt->keysize; |
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290 S2C_keysize = ses.newkeys->trans_algo_crypt->keysize; |
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291 mactransletter = 'F'; |
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292 macrecvletter = 'E'; |
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293 } |
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294 |
|
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295 hashkeys(C2S_IV, SHA1_HASH_SIZE, &hs, 'A'); |
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296 hashkeys(S2C_IV, SHA1_HASH_SIZE, &hs, 'B'); |
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297 hashkeys(C2S_key, C2S_keysize, &hs, 'C'); |
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298 hashkeys(S2C_key, S2C_keysize, &hs, 'D'); |
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299 |
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300 if (cbc_start( |
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301 find_cipher(ses.newkeys->recv_algo_crypt->cipherdesc->name), |
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302 recv_IV, recv_key, |
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303 ses.newkeys->recv_algo_crypt->keysize, 0, |
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304 &ses.newkeys->recv_symmetric_struct) != CRYPT_OK) { |
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305 dropbear_exit("crypto error"); |
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306 } |
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307 |
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308 if (cbc_start( |
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309 find_cipher(ses.newkeys->trans_algo_crypt->cipherdesc->name), |
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310 trans_IV, trans_key, |
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311 ses.newkeys->trans_algo_crypt->keysize, 0, |
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312 &ses.newkeys->trans_symmetric_struct) != CRYPT_OK) { |
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313 dropbear_exit("crypto error"); |
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314 } |
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315 |
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316 /* MAC keys */ |
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317 hashkeys(ses.newkeys->transmackey, |
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318 ses.newkeys->trans_algo_mac->keysize, &hs, mactransletter); |
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319 hashkeys(ses.newkeys->recvmackey, |
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320 ses.newkeys->recv_algo_mac->keysize, &hs, macrecvletter); |
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321 |
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322 #ifndef DISABLE_ZLIB |
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323 gen_new_zstreams(); |
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324 #endif |
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325 |
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326 /* Switch over to the new keys */ |
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327 m_burn(ses.keys, sizeof(struct key_context)); |
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328 m_free(ses.keys); |
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329 ses.keys = ses.newkeys; |
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330 ses.newkeys = NULL; |
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331 |
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332 TRACE(("leave gen_new_keys")) |
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333 } |
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334 |
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335 #ifndef DISABLE_ZLIB |
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336 /* Set up new zlib compression streams, close the old ones. Only |
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337 * called from gen_new_keys() */ |
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338 static void gen_new_zstreams() { |
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339 |
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340 /* create new zstreams */ |
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341 if (ses.newkeys->recv_algo_comp == DROPBEAR_COMP_ZLIB) { |
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342 ses.newkeys->recv_zstream = (z_streamp)m_malloc(sizeof(z_stream)); |
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343 ses.newkeys->recv_zstream->zalloc = Z_NULL; |
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344 ses.newkeys->recv_zstream->zfree = Z_NULL; |
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345 |
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346 if (inflateInit(ses.newkeys->recv_zstream) != Z_OK) { |
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347 dropbear_exit("zlib error"); |
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348 } |
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349 } else { |
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350 ses.newkeys->recv_zstream = NULL; |
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351 } |
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352 |
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353 if (ses.newkeys->trans_algo_comp == DROPBEAR_COMP_ZLIB) { |
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354 ses.newkeys->trans_zstream = (z_streamp)m_malloc(sizeof(z_stream)); |
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355 ses.newkeys->trans_zstream->zalloc = Z_NULL; |
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356 ses.newkeys->trans_zstream->zfree = Z_NULL; |
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357 |
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358 if (deflateInit(ses.newkeys->trans_zstream, Z_DEFAULT_COMPRESSION) |
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359 != Z_OK) { |
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360 dropbear_exit("zlib error"); |
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361 } |
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362 } else { |
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363 ses.newkeys->trans_zstream = NULL; |
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364 } |
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365 |
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366 /* clean up old keys */ |
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367 if (ses.keys->recv_zstream != NULL) { |
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368 if (inflateEnd(ses.keys->recv_zstream) == Z_STREAM_ERROR) { |
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369 /* Z_DATA_ERROR is ok, just means that stream isn't ended */ |
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370 dropbear_exit("crypto error"); |
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371 } |
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372 m_free(ses.keys->recv_zstream); |
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373 } |
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374 if (ses.keys->trans_zstream != NULL) { |
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375 if (deflateEnd(ses.keys->trans_zstream) == Z_STREAM_ERROR) { |
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376 /* Z_DATA_ERROR is ok, just means that stream isn't ended */ |
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377 dropbear_exit("crypto error"); |
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378 } |
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379 m_free(ses.keys->trans_zstream); |
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380 } |
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381 } |
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382 #endif |
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383 |
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384 |
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385 /* Executed upon receiving a kexinit message from the client to initiate |
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386 * key exchange. If we haven't already done so, we send the list of our |
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387 * preferred algorithms. The client's requested algorithms are processed, |
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388 * and we calculate the first portion of the key-exchange-hash for used |
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389 * later in the key exchange. No response is sent, as the client should |
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390 * initiate the diffie-hellman key exchange */ |
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391 |
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392 /* Originally from kex.c, generalized for cli/svr mode --mihnea */ |
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393 /* Belongs in common_kex.c where it should be moved after review */ |
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394 void recv_msg_kexinit() { |
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395 |
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396 TRACE(("<- KEXINIT")) |
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397 TRACE(("enter recv_msg_kexinit")) |
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398 |
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399 /* start the kex hash */ |
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400 ses.kexhashbuf = buf_new(MAX_KEXHASHBUF); |
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401 |
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402 if (!ses.kexstate.sentkexinit) { |
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403 /* we need to send a kex packet */ |
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404 send_msg_kexinit(); |
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405 TRACE(("continue recv_msg_kexinit: sent kexinit")) |
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406 } |
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407 |
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408 |
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409 if (IS_DROPBEAR_CLIENT) { |
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410 |
| 26 | 411 /* read the peer's choice of algos */ |
| 33 | 412 read_kex_algos(); |
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413 |
| 26 | 414 /* V_C, the client's version string (CR and NL excluded) */ |
|
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415 buf_putstring(ses.kexhashbuf, |
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416 (unsigned char*)LOCAL_IDENT, strlen(LOCAL_IDENT)); |
| 26 | 417 /* V_S, the server's version string (CR and NL excluded) */ |
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418 buf_putstring(ses.kexhashbuf, |
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419 ses.remoteident, strlen((char*)ses.remoteident)); |
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420 |
| 26 | 421 /* I_C, the payload of the client's SSH_MSG_KEXINIT */ |
|
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422 buf_putstring(ses.kexhashbuf, |
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423 buf_getptr(ses.transkexinit, ses.transkexinit->len), |
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424 ses.transkexinit->len); |
| 26 | 425 /* I_S, the payload of the server's SSH_MSG_KEXINIT */ |
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426 buf_setpos(ses.payload, 0); |
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427 buf_putstring(ses.kexhashbuf, |
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428 buf_getptr(ses.payload, ses.payload->len), |
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429 ses.payload->len); |
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430 |
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431 } else { |
| 26 | 432 /* SERVER */ |
|
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433 |
| 26 | 434 /* read the peer's choice of algos */ |
| 33 | 435 read_kex_algos(); |
| 26 | 436 /* V_C, the client's version string (CR and NL excluded) */ |
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437 buf_putstring(ses.kexhashbuf, |
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438 ses.remoteident, strlen((char*)ses.remoteident)); |
| 26 | 439 /* V_S, the server's version string (CR and NL excluded) */ |
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440 buf_putstring(ses.kexhashbuf, |
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441 (unsigned char*)LOCAL_IDENT, strlen(LOCAL_IDENT)); |
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442 |
| 26 | 443 /* I_C, the payload of the client's SSH_MSG_KEXINIT */ |
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444 buf_setpos(ses.payload, 0); |
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445 buf_putstring(ses.kexhashbuf, |
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446 buf_getptr(ses.payload, ses.payload->len), |
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447 ses.payload->len); |
| 26 | 448 /* I_S, the payload of the server's SSH_MSG_KEXINIT */ |
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449 buf_putstring(ses.kexhashbuf, |
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450 buf_getptr(ses.transkexinit, ses.transkexinit->len), |
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451 ses.transkexinit->len); |
| 26 | 452 ses.requirenext = SSH_MSG_KEXDH_INIT; |
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453 } |
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454 |
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455 buf_free(ses.transkexinit); |
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456 ses.transkexinit = NULL; |
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457 /* the rest of ses.kexhashbuf will be done after DH exchange */ |
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458 |
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459 ses.kexstate.recvkexinit = 1; |
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460 |
|
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461 TRACE(("leave recv_msg_kexinit")) |
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462 } |
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463 |
| 26 | 464 /* Initialises and generate one side of the diffie-hellman key exchange values. |
| 465 * See the ietf-secsh-transport draft, section 6, for details */ | |
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466 /* dh_pub and dh_priv MUST be already initialised */ |
| 26 | 467 void gen_kexdh_vals(mp_int *dh_pub, mp_int *dh_priv) { |
| 468 | |
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469 DEF_MP_INT(dh_p); |
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470 DEF_MP_INT(dh_q); |
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471 DEF_MP_INT(dh_g); |
| 26 | 472 |
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473 TRACE(("enter send_msg_kexdh_reply")) |
| 26 | 474 |
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475 m_mp_init_multi(&dh_g, &dh_p, &dh_q, NULL); |
| 26 | 476 |
| 477 /* read the prime and generator*/ | |
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478 bytes_to_mp(&dh_p, (unsigned char*)dh_p_val, DH_P_LEN); |
| 26 | 479 |
| 480 if (mp_set_int(&dh_g, DH_G_VAL) != MP_OKAY) { | |
| 481 dropbear_exit("Diffie-Hellman error"); | |
| 482 } | |
| 483 | |
| 484 /* calculate q = (p-1)/2 */ | |
| 485 /* dh_priv is just a temp var here */ | |
| 486 if (mp_sub_d(&dh_p, 1, dh_priv) != MP_OKAY) { | |
| 487 dropbear_exit("Diffie-Hellman error"); | |
| 488 } | |
| 489 if (mp_div_2(dh_priv, &dh_q) != MP_OKAY) { | |
| 490 dropbear_exit("Diffie-Hellman error"); | |
| 491 } | |
| 492 | |
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493 /* Generate a private portion 0 < dh_priv < dh_q */ |
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494 gen_random_mpint(&dh_q, dh_priv); |
| 26 | 495 |
| 496 /* f = g^y mod p */ | |
| 497 if (mp_exptmod(&dh_g, dh_priv, &dh_p, dh_pub) != MP_OKAY) { | |
| 498 dropbear_exit("Diffie-Hellman error"); | |
| 499 } | |
| 500 mp_clear_multi(&dh_g, &dh_p, &dh_q, NULL); | |
| 501 } | |
| 502 | |
| 503 /* This function is fairly common between client/server, with some substitution | |
| 504 * of dh_e/dh_f etc. Hence these arguments: | |
| 505 * dh_pub_us is 'e' for the client, 'f' for the server. dh_pub_them is | |
| 506 * vice-versa. dh_priv is the x/y value corresponding to dh_pub_us */ | |
| 507 void kexdh_comb_key(mp_int *dh_pub_us, mp_int *dh_priv, mp_int *dh_pub_them, | |
| 508 sign_key *hostkey) { | |
| 509 | |
| 510 mp_int dh_p; | |
| 511 mp_int *dh_e = NULL, *dh_f = NULL; | |
| 512 hash_state hs; | |
| 513 | |
| 514 /* read the prime and generator*/ | |
| 515 mp_init(&dh_p); | |
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516 bytes_to_mp(&dh_p, dh_p_val, DH_P_LEN); |
| 26 | 517 |
| 518 /* Check that dh_pub_them (dh_e or dh_f) is in the range [1, p-1] */ | |
| 519 if (mp_cmp(dh_pub_them, &dh_p) != MP_LT | |
| 520 || mp_cmp_d(dh_pub_them, 0) != MP_GT) { | |
| 521 dropbear_exit("Diffie-Hellman error"); | |
| 522 } | |
| 523 | |
| 524 /* K = e^y mod p = f^x mod p */ | |
| 525 ses.dh_K = (mp_int*)m_malloc(sizeof(mp_int)); | |
| 526 m_mp_init(ses.dh_K); | |
| 527 if (mp_exptmod(dh_pub_them, dh_priv, &dh_p, ses.dh_K) != MP_OKAY) { | |
| 528 dropbear_exit("Diffie-Hellman error"); | |
| 529 } | |
| 530 | |
| 531 /* clear no longer needed vars */ | |
| 532 mp_clear_multi(&dh_p, NULL); | |
| 533 | |
| 534 /* From here on, the code needs to work with the _same_ vars on each side, | |
| 535 * not vice-versaing for client/server */ | |
| 536 if (IS_DROPBEAR_CLIENT) { | |
| 537 dh_e = dh_pub_us; | |
| 538 dh_f = dh_pub_them; | |
| 539 } else { | |
| 540 dh_e = dh_pub_them; | |
| 541 dh_f = dh_pub_us; | |
| 542 } | |
| 543 | |
| 544 /* Create the remainder of the hash buffer, to generate the exchange hash */ | |
| 545 /* K_S, the host key */ | |
| 546 buf_put_pub_key(ses.kexhashbuf, hostkey, ses.newkeys->algo_hostkey); | |
| 547 /* e, exchange value sent by the client */ | |
| 548 buf_putmpint(ses.kexhashbuf, dh_e); | |
| 549 /* f, exchange value sent by the server */ | |
| 550 buf_putmpint(ses.kexhashbuf, dh_f); | |
| 551 /* K, the shared secret */ | |
| 552 buf_putmpint(ses.kexhashbuf, ses.dh_K); | |
| 553 | |
| 554 /* calculate the hash H to sign */ | |
| 555 sha1_init(&hs); | |
| 556 buf_setpos(ses.kexhashbuf, 0); | |
| 557 sha1_process(&hs, buf_getptr(ses.kexhashbuf, ses.kexhashbuf->len), | |
| 558 ses.kexhashbuf->len); | |
| 559 sha1_done(&hs, ses.hash); | |
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560 |
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561 buf_burn(ses.kexhashbuf); |
| 26 | 562 buf_free(ses.kexhashbuf); |
| 563 ses.kexhashbuf = NULL; | |
| 564 | |
| 565 /* first time around, we set the session_id to H */ | |
| 566 if (ses.session_id == NULL) { | |
| 567 /* create the session_id, this never needs freeing */ | |
| 568 ses.session_id = (unsigned char*)m_malloc(SHA1_HASH_SIZE); | |
| 569 memcpy(ses.session_id, ses.hash, SHA1_HASH_SIZE); | |
| 570 } | |
| 571 } | |
| 572 | |
| 573 /* read the other side's algo list. buf_match_algo is a callback to match | |
| 574 * algos for the client or server. */ | |
| 33 | 575 static void read_kex_algos() { |
| 26 | 576 |
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577 /* for asymmetry */ |
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578 algo_type * c2s_hash_algo = NULL; |
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579 algo_type * s2c_hash_algo = NULL; |
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580 algo_type * c2s_cipher_algo = NULL; |
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581 algo_type * s2c_cipher_algo = NULL; |
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582 algo_type * c2s_comp_algo = NULL; |
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583 algo_type * s2c_comp_algo = NULL; |
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584 /* the generic one */ |
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585 algo_type * algo = NULL; |
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586 |
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587 /* which algo couldn't match */ |
| 26 | 588 char * erralgo = NULL; |
| 589 | |
| 590 int goodguess = 0; | |
| 591 int allgood = 1; /* we AND this with each goodguess and see if its still | |
| 592 true after */ | |
| 593 | |
| 594 buf_incrpos(ses.payload, 16); /* start after the cookie */ | |
| 595 | |
| 596 ses.newkeys = (struct key_context*)m_malloc(sizeof(struct key_context)); | |
| 597 | |
| 598 /* kex_algorithms */ | |
| 33 | 599 algo = ses.buf_match_algo(ses.payload, sshkex, &goodguess); |
| 26 | 600 allgood &= goodguess; |
| 601 if (algo == NULL) { | |
| 602 erralgo = "kex"; | |
| 603 goto error; | |
| 604 } | |
|
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605 TRACE(("kex algo %s", algo->name)) |
| 26 | 606 ses.newkeys->algo_kex = algo->val; |
| 607 | |
| 608 /* server_host_key_algorithms */ | |
| 33 | 609 algo = ses.buf_match_algo(ses.payload, sshhostkey, &goodguess); |
| 26 | 610 allgood &= goodguess; |
| 611 if (algo == NULL) { | |
| 612 erralgo = "hostkey"; | |
| 613 goto error; | |
| 614 } | |
|
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615 TRACE(("hostkey algo %s", algo->name)) |
| 26 | 616 ses.newkeys->algo_hostkey = algo->val; |
| 617 | |
| 618 /* encryption_algorithms_client_to_server */ | |
|
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619 c2s_cipher_algo = ses.buf_match_algo(ses.payload, sshciphers, &goodguess); |
|
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620 if (c2s_cipher_algo == NULL) { |
| 26 | 621 erralgo = "enc c->s"; |
| 622 goto error; | |
| 623 } | |
|
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624 TRACE(("c2s is %s", c2s_cipher_algo->name)) |
| 26 | 625 |
| 626 /* encryption_algorithms_server_to_client */ | |
|
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627 s2c_cipher_algo = ses.buf_match_algo(ses.payload, sshciphers, &goodguess); |
|
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628 if (s2c_cipher_algo == NULL) { |
| 26 | 629 erralgo = "enc s->c"; |
| 630 goto error; | |
| 631 } | |
|
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632 TRACE(("s2c is %s", s2c_cipher_algo->name)) |
| 26 | 633 |
| 634 /* mac_algorithms_client_to_server */ | |
|
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635 c2s_hash_algo = ses.buf_match_algo(ses.payload, sshhashes, &goodguess); |
|
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636 if (c2s_hash_algo == NULL) { |
| 26 | 637 erralgo = "mac c->s"; |
| 638 goto error; | |
| 639 } | |
| 640 | |
| 641 /* mac_algorithms_server_to_client */ | |
|
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642 s2c_hash_algo = ses.buf_match_algo(ses.payload, sshhashes, &goodguess); |
|
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643 if (s2c_hash_algo == NULL) { |
| 26 | 644 erralgo = "mac s->c"; |
| 645 goto error; | |
| 646 } | |
| 647 | |
| 648 /* compression_algorithms_client_to_server */ | |
|
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649 c2s_comp_algo = ses.buf_match_algo(ses.payload, sshcompress, &goodguess); |
|
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650 if (c2s_comp_algo == NULL) { |
| 26 | 651 erralgo = "comp c->s"; |
| 652 goto error; | |
| 653 } | |
| 654 | |
| 655 /* compression_algorithms_server_to_client */ | |
|
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656 s2c_comp_algo = ses.buf_match_algo(ses.payload, sshcompress, &goodguess); |
|
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657 if (s2c_comp_algo == NULL) { |
| 26 | 658 erralgo = "comp s->c"; |
| 659 goto error; | |
| 660 } | |
| 661 | |
| 662 /* languages_client_to_server */ | |
| 663 buf_eatstring(ses.payload); | |
| 664 | |
| 665 /* languages_server_to_client */ | |
| 666 buf_eatstring(ses.payload); | |
| 667 | |
| 668 /* first_kex_packet_follows */ | |
|
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669 if (buf_getbool(ses.payload)) { |
| 26 | 670 ses.kexstate.firstfollows = 1; |
| 671 /* if the guess wasn't good, we ignore the packet sent */ | |
| 672 if (!allgood) { | |
| 673 ses.ignorenext = 1; | |
| 674 } | |
| 675 } | |
| 676 | |
|
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677 /* Handle the asymmetry */ |
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678 if (IS_DROPBEAR_CLIENT) { |
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679 ses.newkeys->recv_algo_crypt = |
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680 (struct dropbear_cipher*)s2c_cipher_algo->data; |
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681 ses.newkeys->trans_algo_crypt = |
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682 (struct dropbear_cipher*)c2s_cipher_algo->data; |
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683 ses.newkeys->recv_algo_mac = |
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684 (struct dropbear_hash*)s2c_hash_algo->data; |
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685 ses.newkeys->trans_algo_mac = |
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686 (struct dropbear_hash*)c2s_hash_algo->data; |
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687 ses.newkeys->recv_algo_comp = s2c_comp_algo->val; |
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688 ses.newkeys->trans_algo_comp = c2s_comp_algo->val; |
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689 } else { |
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690 /* SERVER */ |
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691 ses.newkeys->recv_algo_crypt = |
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692 (struct dropbear_cipher*)c2s_cipher_algo->data; |
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693 ses.newkeys->trans_algo_crypt = |
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694 (struct dropbear_cipher*)s2c_cipher_algo->data; |
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695 ses.newkeys->recv_algo_mac = |
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696 (struct dropbear_hash*)c2s_hash_algo->data; |
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697 ses.newkeys->trans_algo_mac = |
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698 (struct dropbear_hash*)s2c_hash_algo->data; |
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699 ses.newkeys->recv_algo_comp = c2s_comp_algo->val; |
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700 ses.newkeys->trans_algo_comp = s2c_comp_algo->val; |
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701 } |
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702 |
|
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703 TRACE(("enc algo recv %s", algo->name)) |
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704 TRACE(("enc algo trans %s", algo->name)) |
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705 TRACE(("mac algo recv %s", algo->name)) |
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706 TRACE(("mac algo trans %s", algo->name)) |
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707 TRACE(("comp algo recv %s", algo->name)) |
|
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708 TRACE(("comp algo trans %s", algo->name)) |
|
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709 |
| 26 | 710 /* reserved for future extensions */ |
| 711 buf_getint(ses.payload); | |
| 712 return; | |
| 713 | |
| 714 error: | |
| 715 dropbear_exit("no matching algo %s", erralgo); | |
| 716 } |