annotate svr-kex.c @ 928:7cd89d4e0335

Add new monotonic_now() wrapper so that timeouts are unaffected by system clock changes
author Matt Johnston <matt@ucc.asn.au>
date Thu, 13 Mar 2014 23:50:09 +0800
parents cbc73a5aefb0
children fd2e8bbb0333
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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 "dbrandom.h"
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36 #include "runopts.h"
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37 #include "ecc.h"
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38 #include "gensignkey.h"
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39
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40 static void send_msg_kexdh_reply(mp_int *dh_e, buffer *ecdh_qs);
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41
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42 /* Handle a diffie-hellman key exchange initialisation. This involves
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43 * calculating a session key reply value, and corresponding hash. These
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44 * are carried out by send_msg_kexdh_reply(). recv_msg_kexdh_init() calls
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45 * that function, then brings the new keys into use */
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46 void recv_msg_kexdh_init() {
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47
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48 DEF_MP_INT(dh_e);
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49 buffer *ecdh_qs = NULL;
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50
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51 TRACE(("enter recv_msg_kexdh_init"))
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52 if (!ses.kexstate.recvkexinit) {
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53 dropbear_exit("Premature kexdh_init message received");
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54 }
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55
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56 switch (ses.newkeys->algo_kex->mode) {
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57 case DROPBEAR_KEX_NORMAL_DH:
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58 m_mp_init(&dh_e);
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59 if (buf_getmpint(ses.payload, &dh_e) != DROPBEAR_SUCCESS) {
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60 dropbear_exit("Bad kex value");
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61 }
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62 break;
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63 case DROPBEAR_KEX_ECDH:
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64 case DROPBEAR_KEX_CURVE25519:
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65 #if defined(DROPBEAR_ECDH) || defined(DROPBEAR_CURVE25519)
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66 ecdh_qs = buf_getstringbuf(ses.payload);
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67 #endif
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68 break;
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69 }
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70 if (ses.payload->pos != ses.payload->len) {
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71 dropbear_exit("Bad kex value");
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72 }
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73
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74 send_msg_kexdh_reply(&dh_e, ecdh_qs);
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76 mp_clear(&dh_e);
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77 if (ecdh_qs) {
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78 buf_free(ecdh_qs);
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79 ecdh_qs = NULL;
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80 }
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81
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82 send_msg_newkeys();
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83 ses.requirenext = SSH_MSG_NEWKEYS;
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84 TRACE(("leave recv_msg_kexdh_init"))
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85 }
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86
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87 #ifdef DROPBEAR_DELAY_HOSTKEY
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88 static void svr_ensure_hostkey() {
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89
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90 const char* fn = NULL;
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91 char *fn_temp = NULL;
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92 enum signkey_type type = ses.newkeys->algo_hostkey;
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93 void **hostkey = signkey_key_ptr(svr_opts.hostkey, type);
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94 int ret = DROPBEAR_FAILURE;
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95
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96 if (hostkey && *hostkey) {
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97 return;
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98 }
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99
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100 switch (type)
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101 {
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102 #ifdef DROPBEAR_RSA
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103 case DROPBEAR_SIGNKEY_RSA:
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104 fn = RSA_PRIV_FILENAME;
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105 break;
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106 #endif
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107 #ifdef DROPBEAR_DSS
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108 case DROPBEAR_SIGNKEY_DSS:
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109 fn = DSS_PRIV_FILENAME;
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110 break;
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111 #endif
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112 #ifdef DROPBEAR_ECDSA
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113 case DROPBEAR_SIGNKEY_ECDSA_NISTP256:
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114 case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
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115 case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
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116 fn = ECDSA_PRIV_FILENAME;
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117 break;
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118 #endif
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119 default:
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120 (void)0;
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121 }
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122
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123 if (readhostkey(fn, svr_opts.hostkey, &type) == DROPBEAR_SUCCESS) {
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124 return;
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125 }
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126
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127 fn_temp = m_malloc(strlen(fn) + 20);
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128 snprintf(fn_temp, strlen(fn)+20, "%s.tmp%d", fn, getpid());
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129
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130 if (signkey_generate(type, 0, fn_temp) == DROPBEAR_FAILURE) {
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131 goto out;
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132 }
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133
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134 if (link(fn_temp, fn) < 0) {
852
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135 /* It's OK to get EEXIST - we probably just lost a race
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136 with another connection to generate the key */
846
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137 if (errno != EEXIST) {
852
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138 dropbear_log(LOG_ERR, "Failed moving key file to %s: %s", fn,
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139 strerror(errno));
846
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140 /* XXX fallback to non-atomic copy for some filesystems? */
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141 goto out;
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142 }
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143 }
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144
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145 ret = readhostkey(fn, svr_opts.hostkey, &type);
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146
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147 if (ret == DROPBEAR_SUCCESS) {
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148 char *fp = NULL;
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149 unsigned int len;
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150 buffer *key_buf = buf_new(MAX_PUBKEY_SIZE);
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151 buf_put_pub_key(key_buf, svr_opts.hostkey, type);
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152 buf_setpos(key_buf, 4);
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153 len = key_buf->len - key_buf->pos;
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154 fp = sign_key_fingerprint(buf_getptr(key_buf, len), len);
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155 dropbear_log(LOG_INFO, "Generated hostkey %s, fingerprint is %s",
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156 fn, fp);
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157 m_free(fp);
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158 buf_free(key_buf);
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159 }
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160
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161 out:
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162 if (fn_temp) {
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163 unlink(fn_temp);
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164 m_free(fn_temp);
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165 }
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166
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167 if (ret == DROPBEAR_FAILURE)
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168 {
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169 dropbear_exit("Couldn't read or generate hostkey %s", fn);
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170 }
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171 }
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172 #endif
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173
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174 /* Generate our side of the diffie-hellman key exchange value (dh_f), and
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175 * calculate the session key using the diffie-hellman algorithm. Following
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176 * that, the session hash is calculated, and signed with RSA or DSS. The
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177 * result is sent to the client.
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178 *
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179 * See the transport RFC4253 section 8 for details
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180 * or RFC5656 section 4 for elliptic curve variant. */
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181 static void send_msg_kexdh_reply(mp_int *dh_e, buffer *ecdh_qs) {
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182 TRACE(("enter send_msg_kexdh_reply"))
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183
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184 /* we can start creating the kexdh_reply packet */
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185 CHECKCLEARTOWRITE();
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186
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187 #ifdef DROPBEAR_DELAY_HOSTKEY
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188 if (svr_opts.delay_hostkey)
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189 {
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190 svr_ensure_hostkey();
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191 }
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192 #endif
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193
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194 buf_putbyte(ses.writepayload, SSH_MSG_KEXDH_REPLY);
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195 buf_put_pub_key(ses.writepayload, svr_opts.hostkey,
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196 ses.newkeys->algo_hostkey);
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197
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198 switch (ses.newkeys->algo_kex->mode) {
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199 case DROPBEAR_KEX_NORMAL_DH:
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200 {
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201 struct kex_dh_param * dh_param = gen_kexdh_param();
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202 kexdh_comb_key(dh_param, dh_e, svr_opts.hostkey);
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203
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204 /* put f */
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205 buf_putmpint(ses.writepayload, &dh_param->pub);
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206 free_kexdh_param(dh_param);
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207 }
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208 break;
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209 case DROPBEAR_KEX_ECDH:
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210 #ifdef DROPBEAR_ECDH
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211 {
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212 struct kex_ecdh_param *ecdh_param = gen_kexecdh_param();
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213 kexecdh_comb_key(ecdh_param, ecdh_qs, svr_opts.hostkey);
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214
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215 buf_put_ecc_raw_pubkey_string(ses.writepayload, &ecdh_param->key);
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216 free_kexecdh_param(ecdh_param);
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217 }
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218 #endif
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219 break;
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220 case DROPBEAR_KEX_CURVE25519:
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221 #ifdef DROPBEAR_CURVE25519
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222 {
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223 struct kex_curve25519_param *param = gen_kexcurve25519_param();
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224 kexcurve25519_comb_key(param, ecdh_qs, svr_opts.hostkey);
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225 buf_putstring(ses.writepayload, param->pub, CURVE25519_LEN);
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226 free_kexcurve25519_param(param);
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227 }
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228 #endif
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229 break;
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230 }
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231
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232 /* calc the signature */
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233 buf_put_sign(ses.writepayload, svr_opts.hostkey,
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234 ses.newkeys->algo_hostkey, ses.hash);
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235
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236 /* the SSH_MSG_KEXDH_REPLY is done */
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237 encrypt_packet();
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238
165
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239 TRACE(("leave send_msg_kexdh_reply"))
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240 }
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241