Mercurial > dropbear

annotate libtomcrypt/src/pk/dsa/dsa_verify_hash.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 dsa_verify_hash.c
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13 DSA implementation, verify a signature, Tom St Denis
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14 */
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15
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16
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17 #ifdef LTC_MDSA
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18
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19 /**
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20 Verify a DSA signature
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21 @param r DSA "r" parameter
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22 @param s DSA "s" parameter
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23 @param hash The hash that was signed
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24 @param hashlen The length of the hash that was signed
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25 @param stat [out] The result of the signature verification, 1==valid, 0==invalid
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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26 @param key The corresponding public DSA key
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27 @return CRYPT_OK if successful (even if the signature is invalid)
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28 */
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29 int dsa_verify_hash_raw( void *r, void *s,
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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30 const unsigned char *hash, unsigned long hashlen,
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31 int *stat, dsa_key *key)
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32 {
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33 void *w, *v, *u1, *u2;
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34 int err;
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35
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36 LTC_ARGCHK(r != NULL);
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37 LTC_ARGCHK(s != NULL);
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38 LTC_ARGCHK(stat != NULL);
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39 LTC_ARGCHK(key != NULL);
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40
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41 /* default to invalid signature */
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42 *stat = 0;
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43
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44 /* init our variables */
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45 if ((err = mp_init_multi(&w, &v, &u1, &u2, NULL)) != CRYPT_OK) {
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46 return err;
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47 }
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48
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49 /* neither r or s can be null or >q*/
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50 if (mp_cmp_d(r, 0) != LTC_MP_GT || mp_cmp_d(s, 0) != LTC_MP_GT || mp_cmp(r, key->q) != LTC_MP_LT || mp_cmp(s, key->q) != LTC_MP_LT) {
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51 err = CRYPT_INVALID_PACKET;
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52 goto error;
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53 }
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54
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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55 /* FIPS 186-4 4.7: use leftmost min(bitlen(q), bitlen(hash)) bits of 'hash' */
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56 hashlen = MIN(hashlen, (unsigned long)(key->qord));
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57
285
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58 /* w = 1/s mod q */
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59 if ((err = mp_invmod(s, key->q, w)) != CRYPT_OK) { goto error; }
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60
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61 /* u1 = m * w mod q */
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62 if ((err = mp_read_unsigned_bin(u1, (unsigned char *)hash, hashlen)) != CRYPT_OK) { goto error; }
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63 if ((err = mp_mulmod(u1, w, key->q, u1)) != CRYPT_OK) { goto error; }
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64
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65 /* u2 = r*w mod q */
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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66 if ((err = mp_mulmod(r, w, key->q, u2)) != CRYPT_OK) { goto error; }
285
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67
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68 /* v = g^u1 * y^u2 mod p mod q */
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69 if ((err = mp_exptmod(key->g, u1, key->p, u1)) != CRYPT_OK) { goto error; }
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70 if ((err = mp_exptmod(key->y, u2, key->p, u2)) != CRYPT_OK) { goto error; }
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71 if ((err = mp_mulmod(u1, u2, key->p, v)) != CRYPT_OK) { goto error; }
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72 if ((err = mp_mod(v, key->q, v)) != CRYPT_OK) { goto error; }
285
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73
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74 /* if r = v then we're set */
382
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75 if (mp_cmp(r, v) == LTC_MP_EQ) {
285
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76 *stat = 1;
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77 }
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78
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79 err = CRYPT_OK;
382
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80 error:
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81 mp_clear_multi(w, v, u1, u2, NULL);
285
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82 return err;
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83 }
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84
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85 /**
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86 Verify a DSA signature
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87 @param sig The signature
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 @param siglen The length of the signature (octets)
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 @param hash The hash that was signed
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 @param hashlen The length of the hash that was signed
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 @param stat [out] The result of the signature verification, 1==valid, 0==invalid
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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92 @param key The corresponding public DSA key
285
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 @return CRYPT_OK if successful (even if the signature is invalid)
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 int dsa_verify_hash(const unsigned char *sig, unsigned long siglen,
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
96 const unsigned char *hash, unsigned long hashlen,
285
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 int *stat, dsa_key *key)
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 int err;
382
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diff changeset
100 void *r, *s;
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
101 ltc_asn1_list sig_seq[2];
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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102 unsigned long reallen = 0;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
103
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
104 LTC_ARGCHK(stat != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
105 *stat = 0; /* must be set before the first return */
285
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
107 if ((err = mp_init_multi(&r, &s, NULL)) != CRYPT_OK) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
108 return err;
285
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
109 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
110
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
111 LTC_SET_ASN1(sig_seq, 0, LTC_ASN1_INTEGER, r, 1UL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
112 LTC_SET_ASN1(sig_seq, 1, LTC_ASN1_INTEGER, s, 1UL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
113
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
114 err = der_decode_sequence(sig, siglen, sig_seq, 2);
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diff changeset
115 if (err != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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116 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
117 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
118
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
119 err = der_length_sequence(sig_seq, 2, &reallen);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
120 if (err != CRYPT_OK || reallen != siglen) {
285
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
121 goto LBL_ERR;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
122 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
123
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
124 /* do the op */
382
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Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
125 err = dsa_verify_hash_raw(r, s, hash, hashlen, stat, key);
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
126
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
127 LBL_ERR:
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
128 mp_clear_multi(r, s, NULL);
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
129 return err;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
130 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
131
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
132 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
133
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
134
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
135 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
136 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
137 /* commit time: $Format:%ai$ */