Mercurial > dropbear

annotate libtomcrypt/src/mac/pelican/pelican_memory.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 pelican_memory.c
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13 Pelican MAC, MAC a block of memory, by Tom St Denis
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14 */
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16 #ifdef LTC_PELICAN
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18 /**
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19 Pelican block of memory
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20 @param key The key for the MAC
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21 @param keylen The length of the key (octets)
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22 @param in The input to MAC
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23 @param inlen The length of the input (octets)
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24 @param out [out] The output TAG
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25 @return CRYPT_OK on success
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26 */
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27 int pelican_memory(const unsigned char *key, unsigned long keylen,
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28 const unsigned char *in, unsigned long inlen,
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29 unsigned char *out)
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30 {
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31 pelican_state *pel;
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32 int err;
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34 pel = XMALLOC(sizeof(*pel));
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35 if (pel == NULL) {
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36 return CRYPT_MEM;
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37 }
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39 if ((err = pelican_init(pel, key, keylen)) != CRYPT_OK) {
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40 XFREE(pel);
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41 return err;
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42 }
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43 if ((err = pelican_process(pel, in ,inlen)) != CRYPT_OK) {
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44 XFREE(pel);
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45 return err;
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46 }
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47 err = pelican_done(pel, out);
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48 XFREE(pel);
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49 return err;
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50 }
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53 #endif
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54
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55 /* ref: $Format:%D$ */
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56 /* git commit: $Format:%H$ */
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57 /* commit time: $Format:%ai$ */