Mercurial > dropbear

annotate libtomcrypt/src/pk/dh/dh_set_pg_dhparam.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:
rev   line source
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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
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10 #include "tomcrypt.h"
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11
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12 #ifdef LTC_MDH
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13
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14 /**
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15 Import DH key parts p and g from dhparam
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16
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17 dhparam data: openssl dhparam -outform DER -out dhparam.der 2048
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18
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19 @param dhparam The DH param DER encoded data
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20 @param dhparamlen The length of dhparam data
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21 @param key [out] Where the newly created DH key will be stored
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22 @return CRYPT_OK if successful, note: on error all allocated memory will be freed automatically.
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23 */
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24 int dh_set_pg_dhparam(const unsigned char *dhparam, unsigned long dhparamlen, dh_key *key)
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25 {
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26 int err;
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27
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28 LTC_ARGCHK(key != NULL);
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29 LTC_ARGCHK(ltc_mp.name != NULL);
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30 LTC_ARGCHK(dhparam != NULL);
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31 LTC_ARGCHK(dhparamlen > 0);
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32
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33 if ((err = mp_init_multi(&key->x, &key->y, &key->base, &key->prime, NULL)) != CRYPT_OK) {
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34 return err;
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35 }
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36 if ((err = der_decode_sequence_multi(dhparam, dhparamlen,
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37 LTC_ASN1_INTEGER, 1UL, key->prime,
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38 LTC_ASN1_INTEGER, 1UL, key->base,
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39 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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40 goto LBL_ERR;
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41 }
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42
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43 return CRYPT_OK;
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44
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45 LBL_ERR:
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46 dh_free(key);
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47 return err;
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48 }
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49
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50 #endif /* LTC_MDH */
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51
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52 /* ref: $Format:%D$ */
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53 /* git commit: $Format:%H$ */
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54 /* commit time: $Format:%ai$ */