annotate svr-kex.c @ 848:6c69e7df3621 ecc

curve25519
author Matt Johnston <matt@ucc.asn.au>
date Fri, 08 Nov 2013 23:11:43 +0800
parents 7dcb46da72d9
children 754d7bee1068
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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"
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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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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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55 switch (ses.newkeys->algo_kex->mode) {
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56 case DROPBEAR_KEX_NORMAL_DH:
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57 m_mp_init(&dh_e);
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58 if (buf_getmpint(ses.payload, &dh_e) != DROPBEAR_SUCCESS) {
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59 dropbear_exit("Bad kex value");
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60 }
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61 break;
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62 case DROPBEAR_KEX_ECDH:
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63 case DROPBEAR_KEX_CURVE25519:
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64 #if defined(DROPBEAR_ECDH) || defined(DROPBEAR_CURVE25519)
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65 ecdh_qs = buf_getstringbuf(ses.payload);
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66 if (ses.payload->pos != ses.payload->len) {
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67 dropbear_exit("Bad kex value");
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68 }
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69 #endif
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70 break;
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71 }
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72
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73 send_msg_kexdh_reply(&dh_e, ecdh_qs);
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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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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);
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99 buf_put_pub_key(ses.writepayload, svr_opts.hostkey,
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100 ses.newkeys->algo_hostkey);
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101
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102 switch (ses.newkeys->algo_kex->mode) {
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103 case DROPBEAR_KEX_NORMAL_DH:
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104 {
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105 struct kex_dh_param * dh_param = gen_kexdh_param();
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106 kexdh_comb_key(dh_param, dh_e, svr_opts.hostkey);
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107
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108 /* put f */
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109 buf_putmpint(ses.writepayload, &dh_param->pub);
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110 free_kexdh_param(dh_param);
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111 }
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112 break;
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113 case DROPBEAR_KEX_ECDH:
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114 #ifdef DROPBEAR_ECDH
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115 {
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116 struct kex_ecdh_param *ecdh_param = gen_kexecdh_param();
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117 kexecdh_comb_key(ecdh_param, ecdh_qs, svr_opts.hostkey);
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118
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119 buf_put_ecc_raw_pubkey_string(ses.writepayload, &ecdh_param->key);
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120 free_kexecdh_param(ecdh_param);
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121 }
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122 #endif
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123 break;
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124 case DROPBEAR_KEX_CURVE25519:
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125 #ifdef DROPBEAR_CURVE25519
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126 {
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127 struct kex_curve25519_param *param = gen_kexecdh_param();
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128 kexcurve25519_comb_key(param, ecdh_qs, svr_opts.hostkey);
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129 buf_putstring(ses.writepayload, param->priv, CURVE25519_LEN);
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130 free_kexcurve25519_param(param);
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131 }
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132 #endif
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133 break;
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134 }
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135
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136 /* calc the signature */
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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