Mercurial > dropbear
annotate svr-kex.c @ 848:6c69e7df3621 ecc
curve25519
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 08 Nov 2013 23:11:43 +0800 |
parents | 7dcb46da72d9 |
children | 754d7bee1068 |
rev | line source |
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1 /* |
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2 * Dropbear - a SSH2 server |
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3 * |
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4 * Copyright (c) 2002,2003 Matt Johnston |
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5 * 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" |
24 | 36 #include "runopts.h" |
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37 #include "ecc.h" |
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38 |
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39 static void send_msg_kexdh_reply(mp_int *dh_e, buffer *ecdh_qs); |
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40 |
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41 /* Handle a diffie-hellman key exchange initialisation. This involves |
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42 * calculating a session key reply value, and corresponding hash. These |
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43 * are carried out by send_msg_kexdh_reply(). recv_msg_kexdh_init() calls |
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44 * that function, then brings the new keys into use */ |
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45 void recv_msg_kexdh_init() { |
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46 |
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47 DEF_MP_INT(dh_e); |
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48 buffer *ecdh_qs = NULL; |
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49 |
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50 TRACE(("enter recv_msg_kexdh_init")) |
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51 if (!ses.kexstate.recvkexinit) { |
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52 dropbear_exit("Premature kexdh_init message received"); |
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53 } |
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54 |
848 | 55 switch (ses.newkeys->algo_kex->mode) { |
56 case DROPBEAR_KEX_NORMAL_DH: | |
57 m_mp_init(&dh_e); | |
58 if (buf_getmpint(ses.payload, &dh_e) != DROPBEAR_SUCCESS) { | |
59 dropbear_exit("Bad kex value"); | |
60 } | |
61 break; | |
62 case DROPBEAR_KEX_ECDH: | |
63 case DROPBEAR_KEX_CURVE25519: | |
64 #if defined(DROPBEAR_ECDH) || defined(DROPBEAR_CURVE25519) | |
65 ecdh_qs = buf_getstringbuf(ses.payload); | |
66 if (ses.payload->pos != ses.payload->len) { | |
67 dropbear_exit("Bad kex value"); | |
68 } | |
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69 #endif |
848 | 70 break; |
340 | 71 } |
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72 |
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73 send_msg_kexdh_reply(&dh_e, ecdh_qs); |
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74 |
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75 mp_clear(&dh_e); |
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76 if (ecdh_qs) { |
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77 buf_free(ecdh_qs); |
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78 } |
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79 |
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80 send_msg_newkeys(); |
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81 ses.requirenext[0] = SSH_MSG_NEWKEYS; |
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82 ses.requirenext[1] = 0; |
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83 TRACE(("leave recv_msg_kexdh_init")) |
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84 } |
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85 |
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86 /* Generate our side of the diffie-hellman key exchange value (dh_f), and |
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87 * calculate the session key using the diffie-hellman algorithm. Following |
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88 * that, the session hash is calculated, and signed with RSA or DSS. The |
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89 * result is sent to the client. |
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90 * |
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91 * See the transport RFC4253 section 8 for details |
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92 * or RFC5656 section 4 for elliptic curve variant. */ |
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93 static void send_msg_kexdh_reply(mp_int *dh_e, buffer *ecdh_qs) { |
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94 TRACE(("enter send_msg_kexdh_reply")) |
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95 |
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96 /* we can start creating the kexdh_reply packet */ |
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97 CHECKCLEARTOWRITE(); |
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98 buf_putbyte(ses.writepayload, SSH_MSG_KEXDH_REPLY); |
24 | 99 buf_put_pub_key(ses.writepayload, svr_opts.hostkey, |
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100 ses.newkeys->algo_hostkey); |
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101 |
848 | 102 switch (ses.newkeys->algo_kex->mode) { |
103 case DROPBEAR_KEX_NORMAL_DH: | |
104 { | |
105 struct kex_dh_param * dh_param = gen_kexdh_param(); | |
106 kexdh_comb_key(dh_param, dh_e, svr_opts.hostkey); | |
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107 |
848 | 108 /* put f */ |
109 buf_putmpint(ses.writepayload, &dh_param->pub); | |
110 free_kexdh_param(dh_param); | |
111 } | |
112 break; | |
113 case DROPBEAR_KEX_ECDH: | |
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114 #ifdef DROPBEAR_ECDH |
848 | 115 { |
116 struct kex_ecdh_param *ecdh_param = gen_kexecdh_param(); | |
117 kexecdh_comb_key(ecdh_param, ecdh_qs, svr_opts.hostkey); | |
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118 |
848 | 119 buf_put_ecc_raw_pubkey_string(ses.writepayload, &ecdh_param->key); |
120 free_kexecdh_param(ecdh_param); | |
121 } | |
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122 #endif |
848 | 123 break; |
124 case DROPBEAR_KEX_CURVE25519: | |
125 #ifdef DROPBEAR_CURVE25519 | |
126 { | |
127 struct kex_curve25519_param *param = gen_kexecdh_param(); | |
128 kexcurve25519_comb_key(param, ecdh_qs, svr_opts.hostkey); | |
129 buf_putstring(ses.writepayload, param->priv, CURVE25519_LEN); | |
130 free_kexcurve25519_param(param); | |
131 } | |
132 #endif | |
133 break; | |
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134 } |
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135 |
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136 /* calc the signature */ |
24 | 137 buf_put_sign(ses.writepayload, svr_opts.hostkey, |
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138 ses.newkeys->algo_hostkey, ses.hash); |
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139 |
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140 /* the SSH_MSG_KEXDH_REPLY is done */ |
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141 encrypt_packet(); |
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142 |
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143 TRACE(("leave send_msg_kexdh_reply")) |
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144 } |
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145 |