Mercurial > dropbear

annotate gcm.h @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 3a97f14c0235
children
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1 /*
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2 * Dropbear SSH
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * Copyright (c) 2020 by Vladislav Grishenko
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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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26 #ifndef DROPBEAR_DROPBEAR_GCM_H_
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27 #define DROPBEAR_DROPBEAR_GCM_H_
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29 #include "includes.h"
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30 #include "algo.h"
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32 #if DROPBEAR_ENABLE_GCM_MODE
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34 #define GCM_IVFIX_LEN 4
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35 #define GCM_IVCTR_LEN 8
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36 #define GCM_NONCE_LEN (GCM_IVFIX_LEN + GCM_IVCTR_LEN)
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38 typedef struct {
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39 gcm_state gcm;
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40 unsigned char iv[GCM_NONCE_LEN];
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41 } dropbear_gcm_state;
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43 extern const struct dropbear_cipher_mode dropbear_mode_gcm;
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45 #endif /* DROPBEAR_ENABLE_GCM_MODE */
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47 #endif /* DROPBEAR_DROPBEAR_GCM_H_ */