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annotate libtomcrypt/src/pk/dsa/dsa_set_pqg_dsaparam.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 #include "tomcrypt.h"
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10
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11
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12 #ifdef LTC_MDSA
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13
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14 /**
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15 Import DSA's p, q & g from dsaparam
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16
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17 dsaparam data: openssl dsaparam -outform DER -out dsaparam.der 2048
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18
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19 @param dsaparam The DSA param DER encoded data
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20 @param dsaparamlen The length of dhparam data
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21 @param key [out] the destination for the imported key
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22 @return CRYPT_OK if successful.
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23 */
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24 int dsa_set_pqg_dsaparam(const unsigned char *dsaparam, unsigned long dsaparamlen,
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25 dsa_key *key)
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26 {
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27 int err, stat;
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28
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29 LTC_ARGCHK(dsaparam != NULL);
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30 LTC_ARGCHK(key != NULL);
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31 LTC_ARGCHK(ltc_mp.name != NULL);
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32
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33 /* init key */
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34 err = mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL);
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35 if (err != CRYPT_OK) return err;
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36
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37 if ((err = der_decode_sequence_multi(dsaparam, dsaparamlen,
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38 LTC_ASN1_INTEGER, 1UL, key->p,
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39 LTC_ASN1_INTEGER, 1UL, key->q,
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40 LTC_ASN1_INTEGER, 1UL, key->g,
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41 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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42 goto LBL_ERR;
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43 }
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44
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45 key->qord = mp_unsigned_bin_size(key->q);
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46
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47 /* quick p, q, g validation, without primality testing */
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48 if ((err = dsa_int_validate_pqg(key, &stat)) != CRYPT_OK) {
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49 goto LBL_ERR;
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50 }
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51 if (stat == 0) {
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52 err = CRYPT_INVALID_PACKET;
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53 goto LBL_ERR;
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54 }
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55
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56 return CRYPT_OK;
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57
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58 LBL_ERR:
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59 dsa_free(key);
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60 return err;
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61 }
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62
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63 #endif
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64
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65 /* ref: $Format:%D$ */
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66 /* git commit: $Format:%H$ */
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67 /* commit time: $Format:%ai$ */