Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/utctime/der_length_utctime.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
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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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11 /**
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12 @file der_length_utctime.c
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13 ASN.1 DER, get length of UTCTIME, Tom St Denis
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14 */
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16 #ifdef LTC_DER
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18 /**
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19 Gets length of DER encoding of UTCTIME
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20 @param utctime The UTC time structure to get the size of
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21 @param outlen [out] The length of the DER encoding
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22 @return CRYPT_OK if successful
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23 */
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24 int der_length_utctime(ltc_utctime *utctime, unsigned long *outlen)
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25 {
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26 LTC_ARGCHK(outlen != NULL);
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27 LTC_ARGCHK(utctime != NULL);
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29 if (utctime->off_hh == 0 && utctime->off_mm == 0) {
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30 /* we encode as YYMMDDhhmmssZ */
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31 *outlen = 2 + 13;
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32 } else {
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33 /* we encode as YYMMDDhhmmss{+|-}hh'mm' */
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34 *outlen = 2 + 17;
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35 }
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37 return CRYPT_OK;
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38 }
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40 #endif
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41
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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42 /* ref: $Format:%D$ */
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43 /* git commit: $Format:%H$ */
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44 /* commit time: $Format:%ai$ */