Mercurial > dropbear

annotate libtomcrypt/src/pk/katja/katja_import.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
382
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diff changeset
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 katja_import.c
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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13 Import a PKCS-style Katja key, Tom St Denis
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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14 */
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15
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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16 #ifdef LTC_MKAT
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17
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18 /**
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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19 Import an KatjaPublicKey or KatjaPrivateKey [two-prime only, only support >= 1024-bit keys, defined in PKCS #1 v2.1]
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20 @param in The packet to import from
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21 @param inlen It's length (octets)
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22 @param key [out] Destination for newly imported key
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23 @return CRYPT_OK if successful, upon error allocated memory is freed
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24 */
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25 int katja_import(const unsigned char *in, unsigned long inlen, katja_key *key)
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26 {
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27 int err;
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28 void *zero;
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29
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30 LTC_ARGCHK(in != NULL);
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31 LTC_ARGCHK(key != NULL);
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32 LTC_ARGCHK(ltc_mp.name != NULL);
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33
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34 /* init key */
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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35 if ((err = mp_init_multi(&zero, &key->d, &key->N, &key->dQ,
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36 &key->dP, &key->qP, &key->p, &key->q, &key->pq, NULL)) != CRYPT_OK) {
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37 return err;
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38 }
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39
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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40 if ((err = der_decode_sequence_multi(in, inlen,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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41 LTC_ASN1_INTEGER, 1UL, key->N,
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42 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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43 goto LBL_ERR;
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44 }
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45
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46 if (mp_cmp_d(key->N, 0) == LTC_MP_EQ) {
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47 /* it's a private key */
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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48 if ((err = der_decode_sequence_multi(in, inlen,
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49 LTC_ASN1_INTEGER, 1UL, zero,
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50 LTC_ASN1_INTEGER, 1UL, key->N,
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51 LTC_ASN1_INTEGER, 1UL, key->d,
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52 LTC_ASN1_INTEGER, 1UL, key->p,
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53 LTC_ASN1_INTEGER, 1UL, key->q,
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54 LTC_ASN1_INTEGER, 1UL, key->dP,
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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55 LTC_ASN1_INTEGER, 1UL, key->dQ,
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56 LTC_ASN1_INTEGER, 1UL, key->qP,
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57 LTC_ASN1_INTEGER, 1UL, key->pq,
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58 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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59 goto LBL_ERR;
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60 }
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61 key->type = PK_PRIVATE;
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62 } else {
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63 /* public we have N */
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64 key->type = PK_PUBLIC;
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65 }
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66 mp_clear(zero);
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67 return CRYPT_OK;
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68 LBL_ERR:
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69 mp_clear_multi(zero, key->d, key->N, key->dQ, key->dP,
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70 key->qP, key->p, key->q, key->pq, NULL);
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71 return err;
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72 }
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73
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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74 #endif /* LTC_MRSA */
382
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75
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76
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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77 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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78 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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79 /* commit time: $Format:%ai$ */