Mercurial > dropbear

annotate libtomcrypt/src/pk/katja/katja_exptmod.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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diff changeset
2 *
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diff changeset
3 * LibTomCrypt is a library that provides various cryptographic
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diff changeset
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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diff changeset
8 */
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diff changeset
9 #include "tomcrypt.h"
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10
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diff changeset
11 /**
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12 @file katja_exptmod.c
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
13 Katja PKCS-style exptmod, Tom St Denis
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
14 */
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15
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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16 #ifdef LTC_MKAT
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17
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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18 /**
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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19 Compute an RSA modular exponentiation
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20 @param in The input data to send into RSA
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21 @param inlen The length of the input (octets)
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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22 @param out [out] The destination
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23 @param outlen [in/out] The max size and resulting size of the output
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24 @param which Which exponent to use, e.g. PK_PRIVATE or PK_PUBLIC
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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25 @param key The RSA key to use
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26 @return CRYPT_OK if successful
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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27 */
382
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28 int katja_exptmod(const unsigned char *in, unsigned long inlen,
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29 unsigned char *out, unsigned long *outlen, int which,
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30 katja_key *key)
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31 {
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32 void *tmp, *tmpa, *tmpb;
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33 unsigned long x;
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34 int err;
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35
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36 LTC_ARGCHK(in != NULL);
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37 LTC_ARGCHK(out != NULL);
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38 LTC_ARGCHK(outlen != NULL);
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39 LTC_ARGCHK(key != NULL);
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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40
382
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41 /* is the key of the right type for the operation? */
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42 if (which == PK_PRIVATE && (key->type != PK_PRIVATE)) {
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43 return CRYPT_PK_NOT_PRIVATE;
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44 }
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45
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46 /* must be a private or public operation */
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47 if (which != PK_PRIVATE && which != PK_PUBLIC) {
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48 return CRYPT_PK_INVALID_TYPE;
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49 }
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50
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51 /* init and copy into tmp */
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52 if ((err = mp_init_multi(&tmp, &tmpa, &tmpb, NULL)) != CRYPT_OK) { return err; }
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Matt Johnston <matt@ucc.asn.au>
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53 if ((err = mp_read_unsigned_bin(tmp, (unsigned char *)in, (int)inlen)) != CRYPT_OK) { goto error; }
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Matt Johnston <matt@ucc.asn.au>
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54
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diff changeset
55 /* sanity check on the input */
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56 if (mp_cmp(key->N, tmp) == LTC_MP_LT) {
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57 err = CRYPT_PK_INVALID_SIZE;
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58 goto done;
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59 }
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60
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61 /* are we using the private exponent and is the key optimized? */
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parents:
diff changeset
62 if (which == PK_PRIVATE) {
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diff changeset
63 /* tmpa = tmp^dP mod p */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
64 if ((err = mp_exptmod(tmp, key->dP, key->p, tmpa)) != CRYPT_OK) { goto error; }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
65
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parents:
diff changeset
66 /* tmpb = tmp^dQ mod q */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
67 if ((err = mp_exptmod(tmp, key->dQ, key->q, tmpb)) != CRYPT_OK) { goto error; }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
68
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parents:
diff changeset
69 /* tmp = (tmpa - tmpb) * qInv (mod p) */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
70 if ((err = mp_sub(tmpa, tmpb, tmp)) != CRYPT_OK) { goto error; }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
71 if ((err = mp_mulmod(tmp, key->qP, key->p, tmp)) != CRYPT_OK) { goto error; }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
72
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
73 /* tmp = tmpb + q * tmp */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
74 if ((err = mp_mul(tmp, key->q, tmp)) != CRYPT_OK) { goto error; }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
75 if ((err = mp_add(tmp, tmpb, tmp)) != CRYPT_OK) { goto error; }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
76 } else {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
77 /* exptmod it */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
78 if ((err = mp_exptmod(tmp, key->N, key->N, tmp)) != CRYPT_OK) { goto error; }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
79 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
81 /* read it back */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
82 x = (unsigned long)mp_unsigned_bin_size(key->N);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
83 if (x > *outlen) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 *outlen = x;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85 err = CRYPT_BUFFER_OVERFLOW;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 goto done;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 /* this should never happen ... */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 if (mp_unsigned_bin_size(tmp) > mp_unsigned_bin_size(key->N)) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 err = CRYPT_ERROR;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 goto done;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 *outlen = x;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 /* convert it */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 zeromem(out, x);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 if ((err = mp_to_unsigned_bin(tmp, out+(x-mp_unsigned_bin_size(tmp)))) != CRYPT_OK) { goto error; }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 /* clean up and return */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 err = CRYPT_OK;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 goto done;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 error:
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104 done:
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105 mp_clear_multi(tmp, tmpa, tmpb, NULL);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106 return err;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
107 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
108
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
109 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
110
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
111 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
112 /* 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
113 /* commit time: $Format:%ai$ */