Mercurial > dropbear

annotate libtomcrypt/src/mac/blake2/blake2bmac_file.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 e9dba7abd939
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_BLAKE2BMAC
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13
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14 /**
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15 BLAKE2B MAC a file
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16 @param fname The name of the file you wish to BLAKE2B MAC
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17 @param key The secret key
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18 @param keylen The length of the secret key
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19 @param mac [out] The BLAKE2B MAC authentication tag
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20 @param maclen [in/out] The max size and resulting size of the authentication tag
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21 @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
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22 */
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23 int blake2bmac_file(const char *fname, const unsigned char *key, unsigned long keylen, unsigned char *mac, unsigned long *maclen)
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24 {
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25 #ifdef LTC_NO_FILE
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26 LTC_UNUSED_PARAM(fname);
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27 LTC_UNUSED_PARAM(key);
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28 LTC_UNUSED_PARAM(keylen);
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29 LTC_UNUSED_PARAM(mac);
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30 LTC_UNUSED_PARAM(maclen);
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31 return CRYPT_NOP;
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32 #else
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33 blake2bmac_state st;
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34 FILE *in;
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35 unsigned char *buf;
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36 size_t x;
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37 int err;
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38
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39 LTC_ARGCHK(fname != NULL);
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40 LTC_ARGCHK(key != NULL);
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41 LTC_ARGCHK(mac != NULL);
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42 LTC_ARGCHK(maclen != NULL);
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43
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44 if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
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45 return CRYPT_MEM;
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46 }
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47
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48 if ((err = blake2bmac_init(&st, *maclen, key, keylen)) != CRYPT_OK) {
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49 goto LBL_ERR;
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50 }
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51
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52 in = fopen(fname, "rb");
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53 if (in == NULL) {
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54 err = CRYPT_FILE_NOTFOUND;
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55 goto LBL_ERR;
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56 }
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57
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58 do {
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59 x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
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60 if ((err = blake2bmac_process(&st, buf, (unsigned long)x)) != CRYPT_OK) {
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61 fclose(in);
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62 goto LBL_CLEANBUF;
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63 }
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64 } while (x == LTC_FILE_READ_BUFSIZE);
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65
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66 if (fclose(in) != 0) {
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67 err = CRYPT_ERROR;
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68 goto LBL_CLEANBUF;
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69 }
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70
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71 err = blake2bmac_done(&st, mac, maclen);
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72
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73 LBL_CLEANBUF:
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74 zeromem(buf, LTC_FILE_READ_BUFSIZE);
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75 LBL_ERR:
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76 #ifdef LTC_CLEAN_STACK
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77 zeromem(&st, sizeof(blake2bmac_state));
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78 #endif
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79 XFREE(buf);
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80 return err;
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81 #endif
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82 }
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83
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84 #endif
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85
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86 /* ref: $Format:%D$ */
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87 /* git commit: $Format:%H$ */
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88 /* commit time: $Format:%ai$ */