Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/bit/der_decode_bit_string.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 der_decode_bit_string.c
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13 ASN.1 DER, encode a BIT STRING, Tom St Denis
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14 */
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17 #ifdef LTC_DER
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18
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19 /**
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20 Store a BIT STRING
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21 @param in The DER encoded BIT STRING
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22 @param inlen The size of the DER BIT STRING
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23 @param out [out] The array of bits stored (one per char)
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24 @param outlen [in/out] The number of bits stored
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25 @return CRYPT_OK if successful
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26 */
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27 int der_decode_bit_string(const unsigned char *in, unsigned long inlen,
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28 unsigned char *out, unsigned long *outlen)
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29 {
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30 unsigned long dlen, blen, x, y;
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31
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32 LTC_ARGCHK(in != NULL);
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33 LTC_ARGCHK(out != NULL);
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34 LTC_ARGCHK(outlen != NULL);
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35
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36 /* packet must be at least 4 bytes */
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37 if (inlen < 4) {
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38 return CRYPT_INVALID_ARG;
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39 }
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40
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41 /* check for 0x03 */
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42 if ((in[0]&0x1F) != 0x03) {
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43 return CRYPT_INVALID_PACKET;
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44 }
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45
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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46 /* offset in the data */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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47 x = 1;
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48
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49 /* get the length of the data */
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50 if (in[x] & 0x80) {
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51 /* long format get number of length bytes */
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52 y = in[x++] & 0x7F;
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53
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54 /* invalid if 0 or > 2 */
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55 if (y == 0 || y > 2) {
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56 return CRYPT_INVALID_PACKET;
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57 }
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58
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59 /* read the data len */
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60 dlen = 0;
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61 while (y--) {
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62 dlen = (dlen << 8) | (unsigned long)in[x++];
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63 }
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64 } else {
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65 /* short format */
382
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66 dlen = in[x++] & 0x7F;
285
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67 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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68
285
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69 /* is the data len too long or too short? */
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70 if ((dlen == 0) || (dlen + x > inlen)) {
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71 return CRYPT_INVALID_PACKET;
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72 }
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73
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74 /* get padding count */
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75 blen = ((dlen - 1) << 3) - (in[x++] & 7);
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76
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77 /* too many bits? */
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78 if (blen > *outlen) {
382
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79 *outlen = blen;
285
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80 return CRYPT_BUFFER_OVERFLOW;
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81 }
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82
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83 /* decode/store the bits */
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84 for (y = 0; y < blen; y++) {
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85 out[y] = (in[x] & (1 << (7 - (y & 7)))) ? 1 : 0;
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86 if ((y & 7) == 7) {
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87 ++x;
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88 }
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89 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 /* we done */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 *outlen = blen;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 return CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
98 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
99 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
100 /* commit time: $Format:%ai$ */