Mercurial > dropbear

annotate libtomcrypt/src/mac/hmac/hmac_done.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
285
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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 hmac_done.c
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13 HMAC support, terminate stream, Tom St Denis/Dobes Vandermeer
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14 */
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15
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16 #ifdef LTC_HMAC
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17
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18 #define LTC_HMAC_BLOCKSIZE hash_descriptor[hash].blocksize
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19
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20 /**
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21 Terminate an HMAC session
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22 @param hmac The HMAC state
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23 @param out [out] The destination of the HMAC authentication tag
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24 @param outlen [in/out] The max size and resulting size of the HMAC authentication tag
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25 @return CRYPT_OK if successful
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26 */
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27 int hmac_done(hmac_state *hmac, unsigned char *out, unsigned long *outlen)
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28 {
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29 unsigned char buf[MAXBLOCKSIZE], isha[MAXBLOCKSIZE];
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30 unsigned long hashsize, i;
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31 int hash, err;
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32
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33 LTC_ARGCHK(hmac != NULL);
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34 LTC_ARGCHK(out != NULL);
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35
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36 /* test hash */
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37 hash = hmac->hash;
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38 if((err = hash_is_valid(hash)) != CRYPT_OK) {
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39 return err;
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40 }
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41
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42 /* get the hash message digest size */
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43 hashsize = hash_descriptor[hash].hashsize;
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44
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45 if ((err = hash_descriptor[hash].done(&hmac->md, isha)) != CRYPT_OK) {
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46 goto LBL_ERR;
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47 }
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48
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49 /* Create the second HMAC vector vector for step (3) */
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50 for(i=0; i < LTC_HMAC_BLOCKSIZE; i++) {
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51 buf[i] = hmac->key[i] ^ 0x5C;
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52 }
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53
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54 /* Now calculate the "outer" hash for step (5), (6), and (7) */
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55 if ((err = hash_descriptor[hash].init(&hmac->md)) != CRYPT_OK) {
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56 goto LBL_ERR;
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57 }
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58 if ((err = hash_descriptor[hash].process(&hmac->md, buf, LTC_HMAC_BLOCKSIZE)) != CRYPT_OK) {
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59 goto LBL_ERR;
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60 }
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61 if ((err = hash_descriptor[hash].process(&hmac->md, isha, hashsize)) != CRYPT_OK) {
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62 goto LBL_ERR;
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63 }
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64 if ((err = hash_descriptor[hash].done(&hmac->md, buf)) != CRYPT_OK) {
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65 goto LBL_ERR;
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66 }
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67
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68 /* copy to output */
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69 for (i = 0; i < hashsize && i < *outlen; i++) {
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70 out[i] = buf[i];
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71 }
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72 *outlen = i;
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73
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74 err = CRYPT_OK;
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75 LBL_ERR:
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76 XFREE(hmac->key);
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77 #ifdef LTC_CLEAN_STACK
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78 zeromem(isha, hashsize);
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79 zeromem(buf, hashsize);
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80 zeromem(hmac, sizeof(*hmac));
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81 #endif
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82
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83 return err;
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84 }
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85
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86 #endif
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87
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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88 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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89 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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90 /* commit time: $Format:%ai$ */