Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/boolean/der_decode_boolean.c @ 1715:3974f087d9c0

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Disallow leading lines before the ident for server (#102) Per RFC4253 4.2 clients must be able to process other lines of data before the version string, server behavior is not defined neither with MUST/SHOULD nor with MAY. If server process up to 50 lines too - it may cause too long hanging session with invalid/evil client that consume host resources and potentially may lead to DDoS on poor embedded boxes. Let's require first line from client to be version string and fail early if it's not - matches both RFC and real OpenSSH behavior.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 15 Jun 2020 18:22:18 +0500
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 */
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9 #include "tomcrypt.h"
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10
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11 /**
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12 @file der_decode_boolean.c
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13 ASN.1 DER, decode a BOOLEAN, Tom St Denis
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14 */
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15
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17 #ifdef LTC_DER
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19 /**
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20 Read a BOOLEAN
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21 @param in The destination for the DER encoded BOOLEAN
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22 @param inlen The size of the DER BOOLEAN
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23 @param out [out] The boolean to decode
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24 @return CRYPT_OK if successful
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25 */
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26 int der_decode_boolean(const unsigned char *in, unsigned long inlen,
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27 int *out)
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28 {
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29 LTC_ARGCHK(in != NULL);
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30 LTC_ARGCHK(out != NULL);
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31
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32 if (inlen < 3 || in[0] != 0x01 || in[1] != 0x01 || (in[2] != 0x00 && in[2] != 0xFF)) {
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33 return CRYPT_INVALID_ARG;
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34 }
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35
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36 *out = (in[2]==0xFF) ? 1 : 0;
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37
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38 return CRYPT_OK;
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39 }
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41 #endif
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42
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43 /* ref: $Format:%D$ */
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44 /* git commit: $Format:%H$ */
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45 /* commit time: $Format:%ai$ */