Mercurial > dropbear
annotate common-kex.c @ 409:0e69e948caba
Add comments about requiring keysize <= 2*SHA1_HASH_SIZE
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Sun, 04 Feb 2007 10:31:48 +0000 |
| parents | 63601217f5ab |
| children | b895f91c2ee6 |
| 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, as we are assured that |
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221 * outlen <= 2*SHA1_HASH_SIZE for all known hashes. |
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222 * |
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223 * See Section 7.2 of rfc4253 (ssh transport) for details */ |
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224 static void hashkeys(unsigned char *out, int outlen, |
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225 const hash_state * hs, const unsigned char X) { |
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226 |
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227 hash_state hs2; |
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228 unsigned char k2[SHA1_HASH_SIZE]; /* used to extending */ |
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229 |
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230 memcpy(&hs2, hs, sizeof(hash_state)); |
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231 sha1_process(&hs2, &X, 1); |
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232 sha1_process(&hs2, ses.session_id, SHA1_HASH_SIZE); |
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233 sha1_done(&hs2, out); |
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234 if (SHA1_HASH_SIZE < outlen) { |
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235 /* need to extend */ |
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236 memcpy(&hs2, hs, sizeof(hash_state)); |
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237 sha1_process(&hs2, out, SHA1_HASH_SIZE); |
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238 sha1_done(&hs2, k2); |
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239 memcpy(&out[SHA1_HASH_SIZE], k2, outlen - SHA1_HASH_SIZE); |
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240 } |
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241 } |
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242 |
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243 /* Generate the actual encryption/integrity keys, using the results of the |
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244 * key exchange, as specified in section 5.2 of the IETF secsh-transport |
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245 * draft. This occurs after the DH key-exchange. |
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246 * |
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247 * ses.newkeys is the new set of keys which are generated, these are only |
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248 * taken into use after both sides have sent a newkeys message */ |
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249 |
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250 /* Originally from kex.c, generalized for cli/svr mode --mihnea */ |
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251 void gen_new_keys() { |
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252 |
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253 unsigned char C2S_IV[MAX_IV_LEN]; |
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254 unsigned char C2S_key[MAX_KEY_LEN]; |
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255 unsigned char S2C_IV[MAX_IV_LEN]; |
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256 unsigned char S2C_key[MAX_KEY_LEN]; |
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257 /* unsigned char key[MAX_KEY_LEN]; */ |
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258 unsigned char *trans_IV, *trans_key, *recv_IV, *recv_key; |
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259 |
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260 hash_state hs; |
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261 unsigned int C2S_keysize, S2C_keysize; |
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262 char mactransletter, macrecvletter; /* Client or server specific */ |
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263 |
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264 TRACE(("enter gen_new_keys")) |
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265 /* the dh_K and hash are the start of all hashes, we make use of that */ |
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266 |
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267 sha1_init(&hs); |
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268 sha1_process_mp(&hs, ses.dh_K); |
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269 mp_clear(ses.dh_K); |
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270 m_free(ses.dh_K); |
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271 sha1_process(&hs, ses.hash, SHA1_HASH_SIZE); |
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272 m_burn(ses.hash, SHA1_HASH_SIZE); |
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273 |
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274 if (IS_DROPBEAR_CLIENT) { |
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275 trans_IV = C2S_IV; |
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276 recv_IV = S2C_IV; |
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277 trans_key = C2S_key; |
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278 recv_key = S2C_key; |
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279 C2S_keysize = ses.newkeys->trans_algo_crypt->keysize; |
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280 S2C_keysize = ses.newkeys->recv_algo_crypt->keysize; |
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281 mactransletter = 'E'; |
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282 macrecvletter = 'F'; |
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283 } else { |
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284 trans_IV = S2C_IV; |
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285 recv_IV = C2S_IV; |
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286 trans_key = S2C_key; |
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287 recv_key = C2S_key; |
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288 C2S_keysize = ses.newkeys->recv_algo_crypt->keysize; |
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289 S2C_keysize = ses.newkeys->trans_algo_crypt->keysize; |
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290 mactransletter = 'F'; |
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291 macrecvletter = 'E'; |
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292 } |
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293 |
|
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294 hashkeys(C2S_IV, SHA1_HASH_SIZE, &hs, 'A'); |
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295 hashkeys(S2C_IV, SHA1_HASH_SIZE, &hs, 'B'); |
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296 hashkeys(C2S_key, C2S_keysize, &hs, 'C'); |
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297 hashkeys(S2C_key, S2C_keysize, &hs, 'D'); |
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298 |
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299 if (cbc_start( |
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300 find_cipher(ses.newkeys->recv_algo_crypt->cipherdesc->name), |
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301 recv_IV, recv_key, |
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302 ses.newkeys->recv_algo_crypt->keysize, 0, |
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303 &ses.newkeys->recv_symmetric_struct) != CRYPT_OK) { |
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304 dropbear_exit("crypto error"); |
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305 } |
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306 |
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307 if (cbc_start( |
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308 find_cipher(ses.newkeys->trans_algo_crypt->cipherdesc->name), |
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309 trans_IV, trans_key, |
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310 ses.newkeys->trans_algo_crypt->keysize, 0, |
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311 &ses.newkeys->trans_symmetric_struct) != CRYPT_OK) { |
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312 dropbear_exit("crypto error"); |
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313 } |
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314 |
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315 /* MAC keys */ |
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316 hashkeys(ses.newkeys->transmackey, |
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317 ses.newkeys->trans_algo_mac->keysize, &hs, mactransletter); |
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318 hashkeys(ses.newkeys->recvmackey, |
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319 ses.newkeys->recv_algo_mac->keysize, &hs, macrecvletter); |
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320 |
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321 #ifndef DISABLE_ZLIB |
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322 gen_new_zstreams(); |
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323 #endif |
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324 |
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325 /* Switch over to the new keys */ |
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326 m_burn(ses.keys, sizeof(struct key_context)); |
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327 m_free(ses.keys); |
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328 ses.keys = ses.newkeys; |
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329 ses.newkeys = NULL; |
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330 |
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331 TRACE(("leave gen_new_keys")) |
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332 } |
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333 |
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334 #ifndef DISABLE_ZLIB |
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335 /* Set up new zlib compression streams, close the old ones. Only |
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336 * called from gen_new_keys() */ |
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337 static void gen_new_zstreams() { |
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338 |
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339 /* create new zstreams */ |
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340 if (ses.newkeys->recv_algo_comp == DROPBEAR_COMP_ZLIB) { |
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341 ses.newkeys->recv_zstream = (z_streamp)m_malloc(sizeof(z_stream)); |
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342 ses.newkeys->recv_zstream->zalloc = Z_NULL; |
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343 ses.newkeys->recv_zstream->zfree = Z_NULL; |
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344 |
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345 if (inflateInit(ses.newkeys->recv_zstream) != Z_OK) { |
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346 dropbear_exit("zlib error"); |
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347 } |
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348 } else { |
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349 ses.newkeys->recv_zstream = NULL; |
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350 } |
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351 |
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352 if (ses.newkeys->trans_algo_comp == DROPBEAR_COMP_ZLIB) { |
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353 ses.newkeys->trans_zstream = (z_streamp)m_malloc(sizeof(z_stream)); |
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354 ses.newkeys->trans_zstream->zalloc = Z_NULL; |
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355 ses.newkeys->trans_zstream->zfree = Z_NULL; |
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356 |
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357 if (deflateInit(ses.newkeys->trans_zstream, Z_DEFAULT_COMPRESSION) |
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358 != Z_OK) { |
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359 dropbear_exit("zlib error"); |
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360 } |
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361 } else { |
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362 ses.newkeys->trans_zstream = NULL; |
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363 } |
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364 |
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365 /* clean up old keys */ |
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366 if (ses.keys->recv_zstream != NULL) { |
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367 if (inflateEnd(ses.keys->recv_zstream) == Z_STREAM_ERROR) { |
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368 /* Z_DATA_ERROR is ok, just means that stream isn't ended */ |
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369 dropbear_exit("crypto error"); |
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370 } |
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371 m_free(ses.keys->recv_zstream); |
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372 } |
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373 if (ses.keys->trans_zstream != NULL) { |
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374 if (deflateEnd(ses.keys->trans_zstream) == Z_STREAM_ERROR) { |
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375 /* Z_DATA_ERROR is ok, just means that stream isn't ended */ |
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376 dropbear_exit("crypto error"); |
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377 } |
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378 m_free(ses.keys->trans_zstream); |
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379 } |
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380 } |
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381 #endif |
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382 |
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383 |
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384 /* Executed upon receiving a kexinit message from the client to initiate |
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385 * key exchange. If we haven't already done so, we send the list of our |
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386 * preferred algorithms. The client's requested algorithms are processed, |
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387 * and we calculate the first portion of the key-exchange-hash for used |
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388 * later in the key exchange. No response is sent, as the client should |
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389 * initiate the diffie-hellman key exchange */ |
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390 |
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391 /* Originally from kex.c, generalized for cli/svr mode --mihnea */ |
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392 /* Belongs in common_kex.c where it should be moved after review */ |
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393 void recv_msg_kexinit() { |
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394 |
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395 unsigned int kexhashbuf_len = 0; |
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396 unsigned int remote_ident_len = 0; |
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397 unsigned int local_ident_len = 0; |
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398 |
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399 TRACE(("<- KEXINIT")) |
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400 TRACE(("enter recv_msg_kexinit")) |
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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 /* start the kex hash */ |
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409 local_ident_len = strlen(LOCAL_IDENT); |
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410 remote_ident_len = strlen((char*)ses.remoteident); |
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411 |
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412 kexhashbuf_len = local_ident_len + remote_ident_len |
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413 + ses.transkexinit->len + ses.payload->len |
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414 + KEXHASHBUF_MAX_INTS; |
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415 |
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416 ses.kexhashbuf = buf_new(kexhashbuf_len); |
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417 |
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418 if (IS_DROPBEAR_CLIENT) { |
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419 |
| 26 | 420 /* read the peer's choice of algos */ |
| 33 | 421 read_kex_algos(); |
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422 |
| 26 | 423 /* V_C, the client's version string (CR and NL excluded) */ |
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424 buf_putstring(ses.kexhashbuf, |
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425 (unsigned char*)LOCAL_IDENT, local_ident_len); |
| 26 | 426 /* V_S, the server's version string (CR and NL excluded) */ |
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427 buf_putstring(ses.kexhashbuf, ses.remoteident, remote_ident_len); |
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428 |
| 26 | 429 /* I_C, the payload of the client's SSH_MSG_KEXINIT */ |
|
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430 buf_putstring(ses.kexhashbuf, |
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431 ses.transkexinit->data, ses.transkexinit->len); |
| 26 | 432 /* I_S, the payload of the server's SSH_MSG_KEXINIT */ |
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433 buf_setpos(ses.payload, 0); |
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434 buf_putstring(ses.kexhashbuf, ses.payload->data, ses.payload->len); |
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435 |
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436 } else { |
| 26 | 437 /* SERVER */ |
|
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438 |
| 26 | 439 /* read the peer's choice of algos */ |
| 33 | 440 read_kex_algos(); |
| 26 | 441 /* V_C, the client's version string (CR and NL excluded) */ |
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442 buf_putstring(ses.kexhashbuf, ses.remoteident, remote_ident_len); |
| 26 | 443 /* V_S, the server's version string (CR and NL excluded) */ |
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444 buf_putstring(ses.kexhashbuf, |
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445 (unsigned char*)LOCAL_IDENT, local_ident_len); |
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446 |
| 26 | 447 /* I_C, the payload of the client's SSH_MSG_KEXINIT */ |
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448 buf_setpos(ses.payload, 0); |
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449 buf_putstring(ses.kexhashbuf, ses.payload->data, ses.payload->len); |
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450 |
| 26 | 451 /* I_S, the payload of the server's SSH_MSG_KEXINIT */ |
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452 buf_putstring(ses.kexhashbuf, |
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453 ses.transkexinit->data, ses.transkexinit->len); |
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454 |
| 26 | 455 ses.requirenext = SSH_MSG_KEXDH_INIT; |
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456 } |
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457 |
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458 buf_free(ses.transkexinit); |
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459 ses.transkexinit = NULL; |
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460 /* the rest of ses.kexhashbuf will be done after DH exchange */ |
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461 |
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462 ses.kexstate.recvkexinit = 1; |
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463 |
|
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464 TRACE(("leave recv_msg_kexinit")) |
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465 } |
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466 |
| 26 | 467 /* Initialises and generate one side of the diffie-hellman key exchange values. |
| 468 * See the ietf-secsh-transport draft, section 6, for details */ | |
|
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469 /* dh_pub and dh_priv MUST be already initialised */ |
| 26 | 470 void gen_kexdh_vals(mp_int *dh_pub, mp_int *dh_priv) { |
| 471 | |
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472 DEF_MP_INT(dh_p); |
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473 DEF_MP_INT(dh_q); |
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474 DEF_MP_INT(dh_g); |
| 26 | 475 |
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476 TRACE(("enter send_msg_kexdh_reply")) |
| 26 | 477 |
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478 m_mp_init_multi(&dh_g, &dh_p, &dh_q, NULL); |
| 26 | 479 |
| 480 /* read the prime and generator*/ | |
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481 bytes_to_mp(&dh_p, (unsigned char*)dh_p_val, DH_P_LEN); |
| 26 | 482 |
| 483 if (mp_set_int(&dh_g, DH_G_VAL) != MP_OKAY) { | |
| 484 dropbear_exit("Diffie-Hellman error"); | |
| 485 } | |
| 486 | |
| 487 /* calculate q = (p-1)/2 */ | |
| 488 /* dh_priv is just a temp var here */ | |
| 489 if (mp_sub_d(&dh_p, 1, dh_priv) != MP_OKAY) { | |
| 490 dropbear_exit("Diffie-Hellman error"); | |
| 491 } | |
| 492 if (mp_div_2(dh_priv, &dh_q) != MP_OKAY) { | |
| 493 dropbear_exit("Diffie-Hellman error"); | |
| 494 } | |
| 495 | |
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496 /* Generate a private portion 0 < dh_priv < dh_q */ |
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497 gen_random_mpint(&dh_q, dh_priv); |
| 26 | 498 |
| 499 /* f = g^y mod p */ | |
| 500 if (mp_exptmod(&dh_g, dh_priv, &dh_p, dh_pub) != MP_OKAY) { | |
| 501 dropbear_exit("Diffie-Hellman error"); | |
| 502 } | |
| 503 mp_clear_multi(&dh_g, &dh_p, &dh_q, NULL); | |
| 504 } | |
| 505 | |
| 506 /* This function is fairly common between client/server, with some substitution | |
| 507 * of dh_e/dh_f etc. Hence these arguments: | |
| 508 * dh_pub_us is 'e' for the client, 'f' for the server. dh_pub_them is | |
| 509 * vice-versa. dh_priv is the x/y value corresponding to dh_pub_us */ | |
| 510 void kexdh_comb_key(mp_int *dh_pub_us, mp_int *dh_priv, mp_int *dh_pub_them, | |
| 511 sign_key *hostkey) { | |
| 512 | |
| 513 mp_int dh_p; | |
| 514 mp_int *dh_e = NULL, *dh_f = NULL; | |
| 515 hash_state hs; | |
| 516 | |
| 517 /* read the prime and generator*/ | |
| 518 mp_init(&dh_p); | |
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519 bytes_to_mp(&dh_p, dh_p_val, DH_P_LEN); |
| 26 | 520 |
| 521 /* Check that dh_pub_them (dh_e or dh_f) is in the range [1, p-1] */ | |
| 522 if (mp_cmp(dh_pub_them, &dh_p) != MP_LT | |
| 523 || mp_cmp_d(dh_pub_them, 0) != MP_GT) { | |
| 524 dropbear_exit("Diffie-Hellman error"); | |
| 525 } | |
| 526 | |
| 527 /* K = e^y mod p = f^x mod p */ | |
| 528 ses.dh_K = (mp_int*)m_malloc(sizeof(mp_int)); | |
| 529 m_mp_init(ses.dh_K); | |
| 530 if (mp_exptmod(dh_pub_them, dh_priv, &dh_p, ses.dh_K) != MP_OKAY) { | |
| 531 dropbear_exit("Diffie-Hellman error"); | |
| 532 } | |
| 533 | |
| 534 /* clear no longer needed vars */ | |
| 535 mp_clear_multi(&dh_p, NULL); | |
| 536 | |
| 537 /* From here on, the code needs to work with the _same_ vars on each side, | |
| 538 * not vice-versaing for client/server */ | |
| 539 if (IS_DROPBEAR_CLIENT) { | |
| 540 dh_e = dh_pub_us; | |
| 541 dh_f = dh_pub_them; | |
| 542 } else { | |
| 543 dh_e = dh_pub_them; | |
| 544 dh_f = dh_pub_us; | |
| 545 } | |
| 546 | |
| 547 /* Create the remainder of the hash buffer, to generate the exchange hash */ | |
| 548 /* K_S, the host key */ | |
| 549 buf_put_pub_key(ses.kexhashbuf, hostkey, ses.newkeys->algo_hostkey); | |
| 550 /* e, exchange value sent by the client */ | |
| 551 buf_putmpint(ses.kexhashbuf, dh_e); | |
| 552 /* f, exchange value sent by the server */ | |
| 553 buf_putmpint(ses.kexhashbuf, dh_f); | |
| 554 /* K, the shared secret */ | |
| 555 buf_putmpint(ses.kexhashbuf, ses.dh_K); | |
| 556 | |
| 557 /* calculate the hash H to sign */ | |
| 558 sha1_init(&hs); | |
| 559 buf_setpos(ses.kexhashbuf, 0); | |
| 560 sha1_process(&hs, buf_getptr(ses.kexhashbuf, ses.kexhashbuf->len), | |
| 561 ses.kexhashbuf->len); | |
| 562 sha1_done(&hs, ses.hash); | |
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563 |
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564 buf_burn(ses.kexhashbuf); |
| 26 | 565 buf_free(ses.kexhashbuf); |
| 566 ses.kexhashbuf = NULL; | |
| 567 | |
| 568 /* first time around, we set the session_id to H */ | |
| 569 if (ses.session_id == NULL) { | |
| 570 /* create the session_id, this never needs freeing */ | |
| 571 ses.session_id = (unsigned char*)m_malloc(SHA1_HASH_SIZE); | |
| 572 memcpy(ses.session_id, ses.hash, SHA1_HASH_SIZE); | |
| 573 } | |
| 574 } | |
| 575 | |
| 576 /* read the other side's algo list. buf_match_algo is a callback to match | |
| 577 * algos for the client or server. */ | |
| 33 | 578 static void read_kex_algos() { |
| 26 | 579 |
|
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580 /* for asymmetry */ |
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581 algo_type * c2s_hash_algo = NULL; |
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582 algo_type * s2c_hash_algo = NULL; |
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583 algo_type * c2s_cipher_algo = NULL; |
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584 algo_type * s2c_cipher_algo = NULL; |
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585 algo_type * c2s_comp_algo = NULL; |
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586 algo_type * s2c_comp_algo = NULL; |
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587 /* the generic one */ |
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588 algo_type * algo = NULL; |
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589 |
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590 /* which algo couldn't match */ |
| 26 | 591 char * erralgo = NULL; |
| 592 | |
| 593 int goodguess = 0; | |
| 594 int allgood = 1; /* we AND this with each goodguess and see if its still | |
| 595 true after */ | |
| 596 | |
| 597 buf_incrpos(ses.payload, 16); /* start after the cookie */ | |
| 598 | |
| 599 ses.newkeys = (struct key_context*)m_malloc(sizeof(struct key_context)); | |
| 600 | |
| 601 /* kex_algorithms */ | |
| 33 | 602 algo = ses.buf_match_algo(ses.payload, sshkex, &goodguess); |
| 26 | 603 allgood &= goodguess; |
| 604 if (algo == NULL) { | |
| 605 erralgo = "kex"; | |
| 606 goto error; | |
| 607 } | |
|
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608 TRACE(("kex algo %s", algo->name)) |
| 26 | 609 ses.newkeys->algo_kex = algo->val; |
| 610 | |
| 611 /* server_host_key_algorithms */ | |
| 33 | 612 algo = ses.buf_match_algo(ses.payload, sshhostkey, &goodguess); |
| 26 | 613 allgood &= goodguess; |
| 614 if (algo == NULL) { | |
| 615 erralgo = "hostkey"; | |
| 616 goto error; | |
| 617 } | |
|
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618 TRACE(("hostkey algo %s", algo->name)) |
| 26 | 619 ses.newkeys->algo_hostkey = algo->val; |
| 620 | |
| 621 /* encryption_algorithms_client_to_server */ | |
|
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622 c2s_cipher_algo = ses.buf_match_algo(ses.payload, sshciphers, &goodguess); |
|
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623 if (c2s_cipher_algo == NULL) { |
| 26 | 624 erralgo = "enc c->s"; |
| 625 goto error; | |
| 626 } | |
|
228
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627 TRACE(("enc c2s is %s", c2s_cipher_algo->name)) |
| 26 | 628 |
| 629 /* encryption_algorithms_server_to_client */ | |
|
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630 s2c_cipher_algo = ses.buf_match_algo(ses.payload, sshciphers, &goodguess); |
|
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631 if (s2c_cipher_algo == NULL) { |
| 26 | 632 erralgo = "enc s->c"; |
| 633 goto error; | |
| 634 } | |
|
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635 TRACE(("enc s2c is %s", s2c_cipher_algo->name)) |
| 26 | 636 |
| 637 /* mac_algorithms_client_to_server */ | |
|
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638 c2s_hash_algo = ses.buf_match_algo(ses.payload, sshhashes, &goodguess); |
|
116
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639 if (c2s_hash_algo == NULL) { |
| 26 | 640 erralgo = "mac c->s"; |
| 641 goto error; | |
| 642 } | |
|
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643 TRACE(("hash c2s is %s", c2s_hash_algo->name)) |
| 26 | 644 |
| 645 /* mac_algorithms_server_to_client */ | |
|
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646 s2c_hash_algo = ses.buf_match_algo(ses.payload, sshhashes, &goodguess); |
|
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647 if (s2c_hash_algo == NULL) { |
| 26 | 648 erralgo = "mac s->c"; |
| 649 goto error; | |
| 650 } | |
|
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651 TRACE(("hash s2c is %s", s2c_hash_algo->name)) |
| 26 | 652 |
| 653 /* compression_algorithms_client_to_server */ | |
|
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654 c2s_comp_algo = ses.buf_match_algo(ses.payload, sshcompress, &goodguess); |
|
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655 if (c2s_comp_algo == NULL) { |
| 26 | 656 erralgo = "comp c->s"; |
| 657 goto error; | |
| 658 } | |
|
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659 TRACE(("hash c2s is %s", c2s_comp_algo->name)) |
| 26 | 660 |
| 661 /* compression_algorithms_server_to_client */ | |
|
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662 s2c_comp_algo = ses.buf_match_algo(ses.payload, sshcompress, &goodguess); |
|
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663 if (s2c_comp_algo == NULL) { |
| 26 | 664 erralgo = "comp s->c"; |
| 665 goto error; | |
| 666 } | |
|
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667 TRACE(("hash s2c is %s", s2c_comp_algo->name)) |
| 26 | 668 |
| 669 /* languages_client_to_server */ | |
| 670 buf_eatstring(ses.payload); | |
| 671 | |
| 672 /* languages_server_to_client */ | |
| 673 buf_eatstring(ses.payload); | |
| 674 | |
| 675 /* first_kex_packet_follows */ | |
|
179
161557a9dde8
* fix longstanding bug with connections being closed on failure to
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676 if (buf_getbool(ses.payload)) { |
| 26 | 677 ses.kexstate.firstfollows = 1; |
| 678 /* if the guess wasn't good, we ignore the packet sent */ | |
| 679 if (!allgood) { | |
| 680 ses.ignorenext = 1; | |
| 681 } | |
| 682 } | |
| 683 | |
|
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684 /* Handle the asymmetry */ |
|
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diff
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685 if (IS_DROPBEAR_CLIENT) { |
|
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diff
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|
686 ses.newkeys->recv_algo_crypt = |
|
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687 (struct dropbear_cipher*)s2c_cipher_algo->data; |
|
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|
688 ses.newkeys->trans_algo_crypt = |
|
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diff
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689 (struct dropbear_cipher*)c2s_cipher_algo->data; |
|
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35
diff
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|
690 ses.newkeys->recv_algo_mac = |
|
a600c015562d
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35
diff
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|
691 (struct dropbear_hash*)s2c_hash_algo->data; |
|
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35
diff
changeset
|
692 ses.newkeys->trans_algo_mac = |
|
a600c015562d
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35
diff
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|
693 (struct dropbear_hash*)c2s_hash_algo->data; |
|
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35
diff
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|
694 ses.newkeys->recv_algo_comp = s2c_comp_algo->val; |
|
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diff
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|
695 ses.newkeys->trans_algo_comp = c2s_comp_algo->val; |
|
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35
diff
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|
696 } else { |
|
a600c015562d
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diff
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|
697 /* SERVER */ |
|
a600c015562d
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35
diff
changeset
|
698 ses.newkeys->recv_algo_crypt = |
|
a600c015562d
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35
diff
changeset
|
699 (struct dropbear_cipher*)c2s_cipher_algo->data; |
|
a600c015562d
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parents:
35
diff
changeset
|
700 ses.newkeys->trans_algo_crypt = |
|
a600c015562d
Handle differing c2s and s2c algorithms properly
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35
diff
changeset
|
701 (struct dropbear_cipher*)s2c_cipher_algo->data; |
|
a600c015562d
Handle differing c2s and s2c algorithms properly
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parents:
35
diff
changeset
|
702 ses.newkeys->recv_algo_mac = |
|
a600c015562d
Handle differing c2s and s2c algorithms properly
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parents:
35
diff
changeset
|
703 (struct dropbear_hash*)c2s_hash_algo->data; |
|
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
704 ses.newkeys->trans_algo_mac = |
|
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
705 (struct dropbear_hash*)s2c_hash_algo->data; |
|
a600c015562d
Handle differing c2s and s2c algorithms properly
Matt Johnston <matt@ucc.asn.au>
parents:
35
diff
changeset
|
706 ses.newkeys->recv_algo_comp = c2s_comp_algo->val; |
|
a600c015562d
Handle differing c2s and s2c algorithms properly
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parents:
35
diff
changeset
|
707 ses.newkeys->trans_algo_comp = s2c_comp_algo->val; |
|
a600c015562d
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parents:
35
diff
changeset
|
708 } |
|
a600c015562d
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35
diff
changeset
|
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 } |