Mercurial > dropbear
annotate common-kex.c @ 33:f789045062e6
Progressing client support
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Tue, 27 Jul 2004 16:30:46 +0000 |
| parents | 0969767bca0d |
| children | e2a1eaa19f22 |
| rev | line source |
|---|---|
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1 /* |
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2 * Dropbear - a SSH2 server |
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3 * SSH client implementation |
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4 * |
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5 * This code is copied from the larger file "kex.c" |
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6 * some functions are verbatim, others are generalized --mihnea |
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7 * |
| 33 | 8 * Copyright (c) 2002-2004 Matt Johnston |
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9 * Portions Copyright (c) 2004 by Mihnea Stoenescu |
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10 * All rights reserved. |
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11 * |
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12 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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13 * of this software and associated documentation files (the "Software"), to deal |
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14 * in the Software without restriction, including without limitation the rights |
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15 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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16 * copies of the Software, and to permit persons to whom the Software is |
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17 * furnished to do so, subject to the following conditions: |
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18 * |
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19 * The above copyright notice and this permission notice shall be included in |
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20 * all copies or substantial portions of the Software. |
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21 * |
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22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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25 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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27 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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28 * SOFTWARE. */ |
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29 |
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30 #include "includes.h" |
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31 #include "dbutil.h" |
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32 #include "algo.h" |
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33 #include "buffer.h" |
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34 #include "session.h" |
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35 #include "kex.h" |
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36 #include "ssh.h" |
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37 #include "packet.h" |
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38 #include "bignum.h" |
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39 #include "random.h" |
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40 |
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41 /* diffie-hellman-group1-sha1 value for p */ |
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42 const unsigned char dh_p_val[] = { |
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43 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2, |
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44 0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1, |
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45 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6, |
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46 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD, |
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47 0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D, |
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48 0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45, |
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49 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9, |
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50 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED, |
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51 0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11, |
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52 0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE6, 0x53, 0x81, |
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53 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; |
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54 |
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55 const int DH_G_VAL = 2; |
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56 |
| 33 | 57 static void kexinitialise(); |
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58 static void gen_new_keys(); |
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59 #ifndef DISABLE_ZLIB |
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60 static void gen_new_zstreams(); |
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61 #endif |
| 33 | 62 static void read_kex_algos(); |
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63 /* helper function for gen_new_keys */ |
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64 static void hashkeys(unsigned char *out, int outlen, |
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65 const hash_state * hs, unsigned const char X); |
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66 |
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67 |
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68 /* Send our list of algorithms we can use */ |
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69 void send_msg_kexinit() { |
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70 |
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71 CHECKCLEARTOWRITE(); |
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72 buf_putbyte(ses.writepayload, SSH_MSG_KEXINIT); |
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73 |
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74 /* cookie */ |
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75 genrandom(buf_getwriteptr(ses.writepayload, 16), 16); |
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76 buf_incrwritepos(ses.writepayload, 16); |
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77 |
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78 /* kex algos */ |
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79 buf_put_algolist(ses.writepayload, sshkex); |
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80 |
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81 /* server_host_key_algorithms */ |
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82 buf_put_algolist(ses.writepayload, sshhostkey); |
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83 |
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84 /* encryption_algorithms_client_to_server */ |
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85 buf_put_algolist(ses.writepayload, sshciphers); |
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86 |
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87 /* encryption_algorithms_server_to_client */ |
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88 buf_put_algolist(ses.writepayload, sshciphers); |
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89 |
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90 /* mac_algorithms_client_to_server */ |
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91 buf_put_algolist(ses.writepayload, sshhashes); |
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92 |
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93 /* mac_algorithms_server_to_client */ |
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94 buf_put_algolist(ses.writepayload, sshhashes); |
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95 |
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96 /* compression_algorithms_client_to_server */ |
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97 buf_put_algolist(ses.writepayload, sshcompress); |
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98 |
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99 /* compression_algorithms_server_to_client */ |
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100 buf_put_algolist(ses.writepayload, sshcompress); |
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101 |
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102 /* languages_client_to_server */ |
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103 buf_putstring(ses.writepayload, "", 0); |
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104 |
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105 /* languages_server_to_client */ |
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106 buf_putstring(ses.writepayload, "", 0); |
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107 |
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108 /* first_kex_packet_follows - unimplemented for now */ |
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109 buf_putbyte(ses.writepayload, 0x00); |
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110 |
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111 /* reserved unit32 */ |
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112 buf_putint(ses.writepayload, 0); |
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113 |
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114 /* set up transmitted kex packet buffer for hashing. |
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115 * This is freed after the end of the kex */ |
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116 ses.transkexinit = buf_newcopy(ses.writepayload); |
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117 |
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118 encrypt_packet(); |
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119 ses.dataallowed = 0; /* don't send other packets during kex */ |
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120 |
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121 TRACE(("DATAALLOWED=0")); |
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122 TRACE(("-> KEXINIT")); |
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123 ses.kexstate.sentkexinit = 1; |
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124 } |
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125 |
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126 /* *** NOTE regarding (send|recv)_msg_newkeys *** |
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127 * Changed by mihnea from the original kex.c to set dataallowed after a |
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128 * completed key exchange, no matter the order in which it was performed. |
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129 * This enables client mode without affecting server functionality. |
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130 */ |
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131 |
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132 /* Bring new keys into use after a key exchange, and let the client know*/ |
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133 void send_msg_newkeys() { |
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134 |
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135 TRACE(("enter send_msg_newkeys")); |
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136 |
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137 /* generate the kexinit request */ |
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138 CHECKCLEARTOWRITE(); |
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139 buf_putbyte(ses.writepayload, SSH_MSG_NEWKEYS); |
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140 encrypt_packet(); |
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141 |
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142 |
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143 /* set up our state */ |
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144 if (ses.kexstate.recvnewkeys) { |
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145 TRACE(("while RECVNEWKEYS=1")); |
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146 gen_new_keys(); |
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147 kexinitialise(); /* we've finished with this kex */ |
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148 TRACE((" -> DATAALLOWED=1")); |
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149 ses.dataallowed = 1; /* we can send other packets again now */ |
| 33 | 150 ses.kexstate.donefirstkex = 1; |
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151 } else { |
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152 ses.kexstate.sentnewkeys = 1; |
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153 TRACE(("SENTNEWKEYS=1")); |
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154 } |
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155 |
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156 TRACE(("-> MSG_NEWKEYS")); |
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157 TRACE(("leave send_msg_newkeys")); |
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158 } |
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159 |
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160 /* Bring the new keys into use after a key exchange */ |
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161 void recv_msg_newkeys() { |
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162 |
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163 TRACE(("<- MSG_NEWKEYS")); |
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164 TRACE(("enter recv_msg_newkeys")); |
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165 |
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166 /* simply check if we've sent SSH_MSG_NEWKEYS, and if so, |
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167 * switch to the new keys */ |
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168 if (ses.kexstate.sentnewkeys) { |
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169 TRACE(("while SENTNEWKEYS=1")); |
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170 gen_new_keys(); |
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171 kexinitialise(); /* we've finished with this kex */ |
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172 TRACE((" -> DATAALLOWED=1")); |
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173 ses.dataallowed = 1; /* we can send other packets again now */ |
| 33 | 174 ses.kexstate.donefirstkex = 1; |
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175 } else { |
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176 TRACE(("RECVNEWKEYS=1")); |
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177 ses.kexstate.recvnewkeys = 1; |
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178 } |
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179 |
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180 TRACE(("leave recv_msg_newkeys")); |
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181 } |
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182 |
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183 |
| 33 | 184 /* Set up the kex for the first time */ |
| 185 void kexfirstinitialise() { | |
| 186 | |
| 187 ses.kexstate.donefirstkex = 0; | |
| 188 kexinitialise(); | |
| 189 } | |
| 190 | |
| 191 /* Reset the kex state, ready for a new negotiation */ | |
| 192 static void kexinitialise() { | |
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193 |
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194 struct timeval tv; |
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195 |
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196 TRACE(("kexinitialise()")); |
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197 |
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198 /* sent/recv'd MSG_KEXINIT */ |
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199 ses.kexstate.sentkexinit = 0; |
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200 ses.kexstate.recvkexinit = 0; |
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201 |
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202 /* sent/recv'd MSG_NEWKEYS */ |
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203 ses.kexstate.recvnewkeys = 0; |
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204 ses.kexstate.sentnewkeys = 0; |
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205 |
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206 /* first_packet_follows */ |
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207 ses.kexstate.firstfollows = 0; |
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208 |
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209 ses.kexstate.datatrans = 0; |
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210 ses.kexstate.datarecv = 0; |
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211 |
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212 if (gettimeofday(&tv, 0) < 0) { |
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213 dropbear_exit("Error getting time"); |
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214 } |
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215 ses.kexstate.lastkextime = tv.tv_sec; |
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216 |
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217 } |
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218 |
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219 /* Helper function for gen_new_keys, creates a hash. It makes a copy of the |
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220 * already initialised hash_state hs, which should already have processed |
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221 * the dh_K and hash, since these are common. X is the letter 'A', 'B' etc. |
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222 * out must have at least min(SHA1_HASH_SIZE, outlen) bytes allocated. |
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223 * The output will only be expanded once, since that is all that is required |
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224 * (for 3DES and SHA, with 24 and 20 bytes respectively). |
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225 * |
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226 * See Section 5.2 of the IETF secsh Transport Draft for details */ |
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227 |
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228 /* Duplicated verbatim from kex.c --mihnea */ |
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229 static void hashkeys(unsigned char *out, int outlen, |
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230 const hash_state * hs, const unsigned char X) { |
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231 |
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232 hash_state hs2; |
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233 unsigned char k2[SHA1_HASH_SIZE]; /* used to extending */ |
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234 |
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235 memcpy(&hs2, hs, sizeof(hash_state)); |
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236 sha1_process(&hs2, &X, 1); |
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237 sha1_process(&hs2, ses.session_id, SHA1_HASH_SIZE); |
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238 sha1_done(&hs2, out); |
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239 if (SHA1_HASH_SIZE < outlen) { |
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240 /* need to extend */ |
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241 memcpy(&hs2, hs, sizeof(hash_state)); |
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242 sha1_process(&hs2, out, SHA1_HASH_SIZE); |
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243 sha1_done(&hs2, k2); |
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244 memcpy(&out[SHA1_HASH_SIZE], k2, outlen - SHA1_HASH_SIZE); |
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245 } |
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246 } |
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247 |
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248 /* Generate the actual encryption/integrity keys, using the results of the |
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249 * key exchange, as specified in section 5.2 of the IETF secsh-transport |
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250 * draft. This occurs after the DH key-exchange. |
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251 * |
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252 * ses.newkeys is the new set of keys which are generated, these are only |
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253 * taken into use after both sides have sent a newkeys message */ |
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254 |
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255 /* Originally from kex.c, generalized for cli/svr mode --mihnea */ |
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256 static void gen_new_keys() { |
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257 |
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258 unsigned char C2S_IV[MAX_IV_LEN]; |
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259 unsigned char C2S_key[MAX_KEY_LEN]; |
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260 unsigned char S2C_IV[MAX_IV_LEN]; |
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261 unsigned char S2C_key[MAX_KEY_LEN]; |
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262 /* unsigned char key[MAX_KEY_LEN]; */ |
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263 unsigned char *trans_IV, *trans_key, *recv_IV, *recv_key; |
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264 |
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265 hash_state hs; |
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266 unsigned int C2S_keysize, S2C_keysize; |
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267 char mactransletter, macrecvletter; /* Client or server specific */ |
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268 |
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269 TRACE(("enter gen_new_keys")); |
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270 /* the dh_K and hash are the start of all hashes, we make use of that */ |
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271 |
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272 sha1_init(&hs); |
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273 sha1_process_mp(&hs, ses.dh_K); |
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274 mp_clear(ses.dh_K); |
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275 m_free(ses.dh_K); |
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276 sha1_process(&hs, ses.hash, SHA1_HASH_SIZE); |
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277 m_burn(ses.hash, SHA1_HASH_SIZE); |
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278 |
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279 hashkeys(C2S_IV, SHA1_HASH_SIZE, &hs, 'A'); |
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280 hashkeys(S2C_IV, SHA1_HASH_SIZE, &hs, 'B'); |
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281 |
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282 if (IS_DROPBEAR_CLIENT) { |
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283 trans_IV = C2S_IV; |
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284 recv_IV = S2C_IV; |
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285 trans_key = C2S_key; |
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286 recv_key = S2C_key; |
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287 C2S_keysize = ses.newkeys->trans_algo_crypt->keysize; |
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288 S2C_keysize = ses.newkeys->recv_algo_crypt->keysize; |
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289 mactransletter = 'E'; |
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290 macrecvletter = 'F'; |
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291 } else { |
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292 trans_IV = S2C_IV; |
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293 recv_IV = C2S_IV; |
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294 trans_key = S2C_key; |
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295 recv_key = C2S_key; |
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296 C2S_keysize = ses.newkeys->recv_algo_crypt->keysize; |
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297 S2C_keysize = ses.newkeys->trans_algo_crypt->keysize; |
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298 mactransletter = 'F'; |
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299 macrecvletter = 'E'; |
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300 } |
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301 |
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302 hashkeys(C2S_key, C2S_keysize, &hs, 'C'); |
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303 hashkeys(S2C_key, S2C_keysize, &hs, 'D'); |
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304 |
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305 if (cbc_start( |
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306 find_cipher(ses.newkeys->recv_algo_crypt->cipherdesc->name), |
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307 recv_IV, recv_key, |
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308 ses.newkeys->recv_algo_crypt->keysize, 0, |
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309 &ses.newkeys->recv_symmetric_struct) != CRYPT_OK) { |
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310 dropbear_exit("crypto error"); |
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311 } |
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312 |
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313 if (cbc_start( |
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314 find_cipher(ses.newkeys->trans_algo_crypt->cipherdesc->name), |
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315 trans_IV, trans_key, |
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316 ses.newkeys->trans_algo_crypt->keysize, 0, |
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317 &ses.newkeys->trans_symmetric_struct) != CRYPT_OK) { |
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318 dropbear_exit("crypto error"); |
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319 } |
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320 |
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321 /* MAC keys */ |
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322 hashkeys(ses.newkeys->transmackey, |
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323 ses.newkeys->trans_algo_mac->keysize, &hs, mactransletter); |
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324 hashkeys(ses.newkeys->recvmackey, |
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325 ses.newkeys->recv_algo_mac->keysize, &hs, macrecvletter); |
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326 |
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327 #ifndef DISABLE_ZLIB |
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328 gen_new_zstreams(); |
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329 #endif |
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330 |
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331 /* Switch over to the new keys */ |
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332 m_burn(ses.keys, sizeof(struct key_context)); |
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333 m_free(ses.keys); |
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334 ses.keys = ses.newkeys; |
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335 ses.newkeys = NULL; |
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336 |
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337 TRACE(("leave gen_new_keys")); |
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338 } |
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339 |
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340 #ifndef DISABLE_ZLIB |
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341 /* Set up new zlib compression streams, close the old ones. Only |
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342 * called from gen_new_keys() */ |
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343 static void gen_new_zstreams() { |
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344 |
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345 /* create new zstreams */ |
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346 if (ses.newkeys->recv_algo_comp == DROPBEAR_COMP_ZLIB) { |
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347 ses.newkeys->recv_zstream = (z_streamp)m_malloc(sizeof(z_stream)); |
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348 ses.newkeys->recv_zstream->zalloc = Z_NULL; |
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349 ses.newkeys->recv_zstream->zfree = Z_NULL; |
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350 |
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351 if (inflateInit(ses.newkeys->recv_zstream) != Z_OK) { |
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352 dropbear_exit("zlib error"); |
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353 } |
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354 } else { |
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355 ses.newkeys->recv_zstream = NULL; |
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356 } |
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357 |
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358 if (ses.newkeys->trans_algo_comp == DROPBEAR_COMP_ZLIB) { |
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359 ses.newkeys->trans_zstream = (z_streamp)m_malloc(sizeof(z_stream)); |
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360 ses.newkeys->trans_zstream->zalloc = Z_NULL; |
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361 ses.newkeys->trans_zstream->zfree = Z_NULL; |
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362 |
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363 if (deflateInit(ses.newkeys->trans_zstream, Z_DEFAULT_COMPRESSION) |
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364 != Z_OK) { |
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365 dropbear_exit("zlib error"); |
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366 } |
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367 } else { |
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368 ses.newkeys->trans_zstream = NULL; |
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369 } |
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370 |
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371 /* clean up old keys */ |
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372 if (ses.keys->recv_zstream != NULL) { |
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373 if (inflateEnd(ses.keys->recv_zstream) == Z_STREAM_ERROR) { |
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374 /* Z_DATA_ERROR is ok, just means that stream isn't ended */ |
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375 dropbear_exit("crypto error"); |
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376 } |
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377 m_free(ses.keys->recv_zstream); |
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378 } |
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379 if (ses.keys->trans_zstream != NULL) { |
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380 if (deflateEnd(ses.keys->trans_zstream) == Z_STREAM_ERROR) { |
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381 /* Z_DATA_ERROR is ok, just means that stream isn't ended */ |
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382 dropbear_exit("crypto error"); |
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383 } |
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384 m_free(ses.keys->trans_zstream); |
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385 } |
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386 } |
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387 #endif |
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388 |
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389 |
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390 /* Executed upon receiving a kexinit message from the client to initiate |
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391 * key exchange. If we haven't already done so, we send the list of our |
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392 * preferred algorithms. The client's requested algorithms are processed, |
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393 * and we calculate the first portion of the key-exchange-hash for used |
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394 * later in the key exchange. No response is sent, as the client should |
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395 * initiate the diffie-hellman key exchange */ |
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396 |
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397 /* Originally from kex.c, generalized for cli/svr mode --mihnea */ |
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398 /* Belongs in common_kex.c where it should be moved after review */ |
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399 void recv_msg_kexinit() { |
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400 |
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401 TRACE(("<- KEXINIT")); |
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402 TRACE(("enter recv_msg_kexinit")); |
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403 |
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404 /* start the kex hash */ |
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405 ses.kexhashbuf = buf_new(MAX_KEXHASHBUF); |
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406 |
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407 if (!ses.kexstate.sentkexinit) { |
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408 /* we need to send a kex packet */ |
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409 send_msg_kexinit(); |
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410 TRACE(("continue recv_msg_kexinit: sent kexinit")); |
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411 } |
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412 |
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413 |
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414 if (IS_DROPBEAR_CLIENT) { |
| 26 | 415 #ifdef DROPBEAR_CLIENT |
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416 |
| 26 | 417 /* read the peer's choice of algos */ |
| 33 | 418 read_kex_algos(); |
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419 |
| 26 | 420 /* V_C, the client's version string (CR and NL excluded) */ |
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421 buf_putstring(ses.kexhashbuf, |
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422 (unsigned char*)LOCAL_IDENT, strlen(LOCAL_IDENT)); |
| 26 | 423 /* V_S, the server's version string (CR and NL excluded) */ |
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424 buf_putstring(ses.kexhashbuf, |
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425 ses.remoteident, strlen((char*)ses.remoteident)); |
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426 |
| 26 | 427 /* I_C, the payload of the client's SSH_MSG_KEXINIT */ |
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428 buf_putstring(ses.kexhashbuf, |
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429 buf_getptr(ses.transkexinit, ses.transkexinit->len), |
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430 ses.transkexinit->len); |
| 26 | 431 /* I_S, the payload of the server's SSH_MSG_KEXINIT */ |
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432 buf_setpos(ses.payload, 0); |
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433 buf_putstring(ses.kexhashbuf, |
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434 buf_getptr(ses.payload, ses.payload->len), |
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435 ses.payload->len); |
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436 |
| 26 | 437 #endif |
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438 } else { |
| 26 | 439 /* SERVER */ |
| 440 #ifdef DROPBEAR_SERVER | |
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441 |
| 26 | 442 /* read the peer's choice of algos */ |
| 33 | 443 read_kex_algos(); |
| 26 | 444 /* V_C, the client's version string (CR and NL excluded) */ |
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445 buf_putstring(ses.kexhashbuf, |
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446 ses.remoteident, strlen((char*)ses.remoteident)); |
| 26 | 447 /* V_S, the server's version string (CR and NL excluded) */ |
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448 buf_putstring(ses.kexhashbuf, |
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449 (unsigned char*)LOCAL_IDENT, strlen(LOCAL_IDENT)); |
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450 |
| 26 | 451 /* I_C, the payload of the client's SSH_MSG_KEXINIT */ |
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452 buf_setpos(ses.payload, 0); |
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453 buf_putstring(ses.kexhashbuf, |
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454 buf_getptr(ses.payload, ses.payload->len), |
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455 ses.payload->len); |
| 26 | 456 /* I_S, the payload of the server's SSH_MSG_KEXINIT */ |
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457 buf_putstring(ses.kexhashbuf, |
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458 buf_getptr(ses.transkexinit, ses.transkexinit->len), |
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459 ses.transkexinit->len); |
| 26 | 460 ses.requirenext = SSH_MSG_KEXDH_INIT; |
| 461 #endif | |
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462 } |
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463 |
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464 buf_free(ses.transkexinit); |
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465 ses.transkexinit = NULL; |
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466 /* the rest of ses.kexhashbuf will be done after DH exchange */ |
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467 |
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468 ses.kexstate.recvkexinit = 1; |
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469 // ses.expecting = 0; // client matt |
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470 |
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471 TRACE(("leave recv_msg_kexinit")); |
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472 } |
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473 |
| 26 | 474 /* Initialises and generate one side of the diffie-hellman key exchange values. |
| 475 * See the ietf-secsh-transport draft, section 6, for details */ | |
| 476 void gen_kexdh_vals(mp_int *dh_pub, mp_int *dh_priv) { | |
| 477 | |
| 478 mp_int dh_p, dh_q, dh_g; | |
| 479 unsigned char randbuf[DH_P_LEN]; | |
| 480 int dh_q_len; | |
| 481 | |
| 482 TRACE(("enter send_msg_kexdh_reply")); | |
| 483 | |
| 484 m_mp_init_multi(&dh_g, &dh_p, &dh_q, dh_priv, dh_pub, NULL); | |
| 485 | |
| 486 /* read the prime and generator*/ | |
| 487 if (mp_read_unsigned_bin(&dh_p, (unsigned char*)dh_p_val, DH_P_LEN) | |
| 488 != MP_OKAY) { | |
| 489 dropbear_exit("Diffie-Hellman error"); | |
| 490 } | |
| 491 | |
| 492 if (mp_set_int(&dh_g, DH_G_VAL) != MP_OKAY) { | |
| 493 dropbear_exit("Diffie-Hellman error"); | |
| 494 } | |
| 495 | |
| 496 /* calculate q = (p-1)/2 */ | |
| 497 /* dh_priv is just a temp var here */ | |
| 498 if (mp_sub_d(&dh_p, 1, dh_priv) != MP_OKAY) { | |
| 499 dropbear_exit("Diffie-Hellman error"); | |
| 500 } | |
| 501 if (mp_div_2(dh_priv, &dh_q) != MP_OKAY) { | |
| 502 dropbear_exit("Diffie-Hellman error"); | |
| 503 } | |
| 504 | |
| 505 dh_q_len = mp_unsigned_bin_size(&dh_q); | |
| 506 | |
| 507 /* calculate our random value dh_y */ | |
| 508 do { | |
| 509 assert((unsigned int)dh_q_len <= sizeof(randbuf)); | |
| 510 genrandom(randbuf, dh_q_len); | |
| 511 if (mp_read_unsigned_bin(dh_priv, randbuf, dh_q_len) != MP_OKAY) { | |
| 512 dropbear_exit("Diffie-Hellman error"); | |
| 513 } | |
| 514 } while (mp_cmp(dh_priv, &dh_q) == MP_GT || mp_cmp_d(dh_priv, 0) != MP_GT); | |
| 515 | |
| 516 /* f = g^y mod p */ | |
| 517 if (mp_exptmod(&dh_g, dh_priv, &dh_p, dh_pub) != MP_OKAY) { | |
| 518 dropbear_exit("Diffie-Hellman error"); | |
| 519 } | |
| 520 mp_clear_multi(&dh_g, &dh_p, &dh_q, NULL); | |
| 521 } | |
| 522 | |
| 523 /* This function is fairly common between client/server, with some substitution | |
| 524 * of dh_e/dh_f etc. Hence these arguments: | |
| 525 * dh_pub_us is 'e' for the client, 'f' for the server. dh_pub_them is | |
| 526 * vice-versa. dh_priv is the x/y value corresponding to dh_pub_us */ | |
| 527 void kexdh_comb_key(mp_int *dh_pub_us, mp_int *dh_priv, mp_int *dh_pub_them, | |
| 528 sign_key *hostkey) { | |
| 529 | |
| 530 mp_int dh_p; | |
| 531 mp_int *dh_e = NULL, *dh_f = NULL; | |
| 532 hash_state hs; | |
| 533 | |
| 534 /* read the prime and generator*/ | |
| 535 mp_init(&dh_p); | |
| 536 if (mp_read_unsigned_bin(&dh_p, (unsigned char*)dh_p_val, DH_P_LEN) | |
| 537 != MP_OKAY) { | |
| 538 dropbear_exit("Diffie-Hellman error"); | |
| 539 } | |
| 540 | |
| 541 /* Check that dh_pub_them (dh_e or dh_f) is in the range [1, p-1] */ | |
| 542 if (mp_cmp(dh_pub_them, &dh_p) != MP_LT | |
| 543 || mp_cmp_d(dh_pub_them, 0) != MP_GT) { | |
| 544 dropbear_exit("Diffie-Hellman error"); | |
| 545 } | |
| 546 | |
| 547 /* K = e^y mod p = f^x mod p */ | |
| 548 ses.dh_K = (mp_int*)m_malloc(sizeof(mp_int)); | |
| 549 m_mp_init(ses.dh_K); | |
| 550 if (mp_exptmod(dh_pub_them, dh_priv, &dh_p, ses.dh_K) != MP_OKAY) { | |
| 551 dropbear_exit("Diffie-Hellman error"); | |
| 552 } | |
| 553 | |
| 554 /* clear no longer needed vars */ | |
| 555 mp_clear_multi(&dh_p, NULL); | |
| 556 | |
| 557 /* From here on, the code needs to work with the _same_ vars on each side, | |
| 558 * not vice-versaing for client/server */ | |
| 559 if (IS_DROPBEAR_CLIENT) { | |
| 560 dh_e = dh_pub_us; | |
| 561 dh_f = dh_pub_them; | |
| 562 } else { | |
| 563 dh_e = dh_pub_them; | |
| 564 dh_f = dh_pub_us; | |
| 565 } | |
| 566 | |
| 567 /* Create the remainder of the hash buffer, to generate the exchange hash */ | |
| 568 /* K_S, the host key */ | |
| 569 buf_put_pub_key(ses.kexhashbuf, hostkey, ses.newkeys->algo_hostkey); | |
| 570 /* e, exchange value sent by the client */ | |
| 571 buf_putmpint(ses.kexhashbuf, dh_e); | |
| 572 /* f, exchange value sent by the server */ | |
| 573 buf_putmpint(ses.kexhashbuf, dh_f); | |
| 574 /* K, the shared secret */ | |
| 575 buf_putmpint(ses.kexhashbuf, ses.dh_K); | |
| 576 | |
| 577 /* calculate the hash H to sign */ | |
| 578 sha1_init(&hs); | |
| 579 buf_setpos(ses.kexhashbuf, 0); | |
| 580 sha1_process(&hs, buf_getptr(ses.kexhashbuf, ses.kexhashbuf->len), | |
| 581 ses.kexhashbuf->len); | |
| 582 sha1_done(&hs, ses.hash); | |
| 583 buf_free(ses.kexhashbuf); | |
| 584 ses.kexhashbuf = NULL; | |
| 585 | |
| 586 /* first time around, we set the session_id to H */ | |
| 587 if (ses.session_id == NULL) { | |
| 588 /* create the session_id, this never needs freeing */ | |
| 589 ses.session_id = (unsigned char*)m_malloc(SHA1_HASH_SIZE); | |
| 590 memcpy(ses.session_id, ses.hash, SHA1_HASH_SIZE); | |
| 591 } | |
| 592 } | |
| 593 | |
| 594 /* read the other side's algo list. buf_match_algo is a callback to match | |
| 595 * algos for the client or server. */ | |
| 33 | 596 static void read_kex_algos() { |
| 26 | 597 |
| 598 algo_type * algo; | |
| 599 char * erralgo = NULL; | |
| 600 | |
| 601 int goodguess = 0; | |
| 602 int allgood = 1; /* we AND this with each goodguess and see if its still | |
| 603 true after */ | |
| 604 | |
| 605 buf_incrpos(ses.payload, 16); /* start after the cookie */ | |
| 606 | |
| 607 ses.newkeys = (struct key_context*)m_malloc(sizeof(struct key_context)); | |
| 608 | |
| 609 /* kex_algorithms */ | |
| 33 | 610 algo = ses.buf_match_algo(ses.payload, sshkex, &goodguess); |
| 26 | 611 allgood &= goodguess; |
| 612 if (algo == NULL) { | |
| 613 erralgo = "kex"; | |
| 614 goto error; | |
| 615 } | |
| 616 ses.newkeys->algo_kex = algo->val; | |
| 617 | |
| 618 /* server_host_key_algorithms */ | |
| 33 | 619 algo = ses.buf_match_algo(ses.payload, sshhostkey, &goodguess); |
| 26 | 620 allgood &= goodguess; |
| 621 if (algo == NULL) { | |
| 622 erralgo = "hostkey"; | |
| 623 goto error; | |
| 624 } | |
| 625 ses.newkeys->algo_hostkey = algo->val; | |
| 626 | |
| 627 /* encryption_algorithms_client_to_server */ | |
| 33 | 628 algo = ses.buf_match_algo(ses.payload, sshciphers, &goodguess); |
| 26 | 629 if (algo == NULL) { |
| 630 erralgo = "enc c->s"; | |
| 631 goto error; | |
| 632 } | |
| 633 ses.newkeys->recv_algo_crypt = (struct dropbear_cipher*)algo->data; | |
| 634 | |
| 635 /* encryption_algorithms_server_to_client */ | |
| 33 | 636 algo = ses.buf_match_algo(ses.payload, sshciphers, &goodguess); |
| 26 | 637 if (algo == NULL) { |
| 638 erralgo = "enc s->c"; | |
| 639 goto error; | |
| 640 } | |
| 641 ses.newkeys->trans_algo_crypt = (struct dropbear_cipher*)algo->data; | |
| 642 | |
| 643 /* mac_algorithms_client_to_server */ | |
| 33 | 644 algo = ses.buf_match_algo(ses.payload, sshhashes, &goodguess); |
| 26 | 645 if (algo == NULL) { |
| 646 erralgo = "mac c->s"; | |
| 647 goto error; | |
| 648 } | |
| 649 ses.newkeys->recv_algo_mac = (struct dropbear_hash*)algo->data; | |
| 650 | |
| 651 /* mac_algorithms_server_to_client */ | |
| 33 | 652 algo = ses.buf_match_algo(ses.payload, sshhashes, &goodguess); |
| 26 | 653 if (algo == NULL) { |
| 654 erralgo = "mac s->c"; | |
| 655 goto error; | |
| 656 } | |
| 657 ses.newkeys->trans_algo_mac = (struct dropbear_hash*)algo->data; | |
| 658 | |
| 659 /* compression_algorithms_client_to_server */ | |
| 33 | 660 algo = ses.buf_match_algo(ses.payload, sshcompress, &goodguess); |
| 26 | 661 if (algo == NULL) { |
| 662 erralgo = "comp c->s"; | |
| 663 goto error; | |
| 664 } | |
| 665 ses.newkeys->recv_algo_comp = algo->val; | |
| 666 | |
| 667 /* compression_algorithms_server_to_client */ | |
| 33 | 668 algo = ses.buf_match_algo(ses.payload, sshcompress, &goodguess); |
| 26 | 669 if (algo == NULL) { |
| 670 erralgo = "comp s->c"; | |
| 671 goto error; | |
| 672 } | |
| 673 ses.newkeys->trans_algo_comp = algo->val; | |
| 674 | |
| 675 /* languages_client_to_server */ | |
| 676 buf_eatstring(ses.payload); | |
| 677 | |
| 678 /* languages_server_to_client */ | |
| 679 buf_eatstring(ses.payload); | |
| 680 | |
| 681 /* first_kex_packet_follows */ | |
| 682 if (buf_getbyte(ses.payload)) { | |
| 683 ses.kexstate.firstfollows = 1; | |
| 684 /* if the guess wasn't good, we ignore the packet sent */ | |
| 685 if (!allgood) { | |
| 686 ses.ignorenext = 1; | |
| 687 } | |
| 688 } | |
| 689 | |
| 690 /* reserved for future extensions */ | |
| 691 buf_getint(ses.payload); | |
| 692 return; | |
| 693 | |
| 694 error: | |
| 695 dropbear_exit("no matching algo %s", erralgo); | |
| 696 } |