Mercurial > dropbear

annotate svr-kex.c @ 1293:dc8f7997f10f

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move group14 and group16 to options.h, group14-sha256 on by default
author Matt Johnston <matt@ucc.asn.au>
date Mon, 02 May 2016 17:03:55 +0200
parents c8f52c19e949
children 56aba7dedbea efad433418c4
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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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e3adf4cf5465 License boilerplate etc, add Mihnea as an author to some of the files
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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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40 static void send_msg_kexdh_reply(mp_int *dh_e, buffer *ecdh_qs);
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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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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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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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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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