Mercurial > dropbear

annotate libtomcrypt/src/pk/rsa/rsa_import_x509.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
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 #include "tomcrypt.h"
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10
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11 /**
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12 @file rsa_import.c
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13 Import an RSA key from a X.509 certificate, Steffen Jaeckel
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14 */
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15
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16 #ifdef LTC_MRSA
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17
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18 /**
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19 Import an RSA key from a X.509 certificate
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20 @param in The packet to import from
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21 @param inlen It's length (octets)
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22 @param key [out] Destination for newly imported key
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23 @return CRYPT_OK if successful, upon error allocated memory is freed
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24 */
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25 int rsa_import_x509(const unsigned char *in, unsigned long inlen, rsa_key *key)
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26 {
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27 int err;
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28 unsigned char *tmpbuf;
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29 unsigned long tmpbuf_len, tmp_inlen;
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30 ltc_asn1_list *decoded_list = NULL, *l;
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31
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32 LTC_ARGCHK(in != NULL);
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33 LTC_ARGCHK(key != NULL);
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34 LTC_ARGCHK(ltc_mp.name != NULL);
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35
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36 /* init key */
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37 if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ,
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38 &key->dP, &key->qP, &key->p, &key->q, NULL)) != CRYPT_OK) {
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39 return err;
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40 }
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41
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42 tmpbuf_len = inlen;
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43 tmpbuf = XCALLOC(1, tmpbuf_len);
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44 if (tmpbuf == NULL) {
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45 err = CRYPT_MEM;
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46 goto LBL_ERR;
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47 }
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48
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49 tmp_inlen = inlen;
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50 if ((err = der_decode_sequence_flexi(in, &tmp_inlen, &decoded_list)) == CRYPT_OK) {
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51 l = decoded_list;
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52 /* Move 2 levels up in the tree
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53 SEQUENCE
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54 SEQUENCE
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55 ...
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56 */
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57 if (l->type == LTC_ASN1_SEQUENCE && l->child) {
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58 l = l->child;
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59 if (l->type == LTC_ASN1_SEQUENCE && l->child) {
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60 l = l->child;
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61
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62 err = CRYPT_ERROR;
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63
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64 /* Move forward in the tree until we find this combination
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65 ...
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66 SEQUENCE
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67 SEQUENCE
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68 OBJECT IDENTIFIER 1.2.840.113549.1.1.1
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69 NULL
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70 BIT STRING
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71 */
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72 do {
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73 /* The additional check for l->data is there to make sure
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74 * we won't try to decode a list that has been 'shrunk'
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75 */
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76 if (l->type == LTC_ASN1_SEQUENCE && l->data && l->child &&
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77 l->child->type == LTC_ASN1_SEQUENCE && l->child->child &&
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78 l->child->child->type == LTC_ASN1_OBJECT_IDENTIFIER && l->child->next &&
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79 l->child->next->type == LTC_ASN1_BIT_STRING) {
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80 err = der_decode_subject_public_key_info(l->data, l->size,
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81 PKA_RSA, tmpbuf, &tmpbuf_len,
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82 LTC_ASN1_NULL, NULL, 0);
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83 if (err == CRYPT_OK) {
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84 /* now it should be SEQUENCE { INTEGER, INTEGER } */
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85 if ((err = der_decode_sequence_multi(tmpbuf, tmpbuf_len,
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86 LTC_ASN1_INTEGER, 1UL, key->N,
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87 LTC_ASN1_INTEGER, 1UL, key->e,
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88 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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89 goto LBL_ERR;
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90 }
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91 key->type = PK_PUBLIC;
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92 err = CRYPT_OK;
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93 goto LBL_FREE;
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94 }
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95 }
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96 l = l->next;
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97 } while(l);
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98 }
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99 }
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100 }
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101
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102
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103 LBL_ERR:
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104 rsa_free(key);
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105
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106 LBL_FREE:
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107 if (decoded_list) der_free_sequence_flexi(decoded_list);
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108 if (tmpbuf != NULL) XFREE(tmpbuf);
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109
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110 return err;
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111 }
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112
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113 #endif /* LTC_MRSA */
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114
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115
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116 /* ref: $Format:%D$ */
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117 /* git commit: $Format:%H$ */
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118 /* commit time: $Format:%ai$ */