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curl/lib/curl_ntlm_core.c
Daniel Gustafsson 94400f32e9 all: Refactor malloc+memset to use calloc 
When a zeroed out allocation is required, use calloc() rather than
malloc() followed by an explicit memset(). The result will be the
same, but using calloc() everywhere increases consistency in the
codebase and avoids the risk of subtle bugs when code is injected
between malloc and memset by accident.

Closes https://github.com/curl/curl/pull/2497
2018-04-15 03:00:37 -04:00

827 lines
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curl_setup.h"
#if defined(USE_NTLM)
/*
* NTLM details:
*
* https://davenport.sourceforge.io/ntlm.html
* https://www.innovation.ch/java/ntlm.html
*/
/* Please keep the SSL backend-specific #if branches in this order:
1. USE_OPENSSL
2. USE_GNUTLS_NETTLE
3. USE_GNUTLS
4. USE_NSS
5. USE_MBEDTLS
6. USE_DARWINSSL
7. USE_OS400CRYPTO
8. USE_WIN32_CRYPTO
This ensures that:
- the same SSL branch gets activated throughout this source
file even if multiple backends are enabled at the same time.
- OpenSSL and NSS have higher priority than Windows Crypt, due
to issues with the latter supporting NTLM2Session responses
in NTLM type-3 messages.
*/
#if !defined(USE_WINDOWS_SSPI) || defined(USE_WIN32_CRYPTO)
#ifdef USE_OPENSSL
# ifdef USE_OPENSSL
# include <openssl/des.h>
# ifndef OPENSSL_NO_MD4
# include <openssl/md4.h>
# endif
# include <openssl/md5.h>
# include <openssl/ssl.h>
# include <openssl/rand.h>
# else
# include <des.h>
# ifndef OPENSSL_NO_MD4
# include <md4.h>
# endif
# include <md5.h>
# include <ssl.h>
# include <rand.h>
# endif
# if (OPENSSL_VERSION_NUMBER < 0x00907001L)
# define DES_key_schedule des_key_schedule
# define DES_cblock des_cblock
# define DES_set_odd_parity des_set_odd_parity
# define DES_set_key des_set_key
# define DES_ecb_encrypt des_ecb_encrypt
# define DESKEY(x) x
# define DESKEYARG(x) x
# else
# define DESKEYARG(x) *x
# define DESKEY(x) &x
# endif
#elif defined(USE_GNUTLS_NETTLE)
# include <nettle/des.h>
# include <nettle/md4.h>
#elif defined(USE_GNUTLS)
# include <gcrypt.h>
# define MD5_DIGEST_LENGTH 16
# define MD4_DIGEST_LENGTH 16
#elif defined(USE_NSS)
# include <nss.h>
# include <pk11pub.h>
# include <hasht.h>
# include "curl_md4.h"
# define MD5_DIGEST_LENGTH MD5_LENGTH
#elif defined(USE_MBEDTLS)
# include <mbedtls/des.h>
# include <mbedtls/md4.h>
# if !defined(MBEDTLS_MD4_C)
# include "curl_md4.h"
# endif
#elif defined(USE_DARWINSSL)
# include <CommonCrypto/CommonCryptor.h>
# include <CommonCrypto/CommonDigest.h>
#elif defined(USE_OS400CRYPTO)
# include "cipher.mih" /* mih/cipher */
# include "curl_md4.h"
#elif defined(USE_WIN32_CRYPTO)
# include <wincrypt.h>
#else
# error "Can't compile NTLM support without a crypto library."
#endif
#include "urldata.h"
#include "non-ascii.h"
#include "strcase.h"
#include "curl_ntlm_core.h"
#include "curl_md5.h"
#include "curl_hmac.h"
#include "warnless.h"
#include "curl_endian.h"
#include "curl_des.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
#define NTLM_HMAC_MD5_LEN (16)
#define NTLMv2_BLOB_SIGNATURE "\x01\x01\x00\x00"
#define NTLMv2_BLOB_LEN (44 -16 + ntlm->target_info_len + 4)
/*
* Turns a 56-bit key into being 64-bit wide.
*/
static void extend_key_56_to_64(const unsigned char *key_56, char *key)
{
key[0] = key_56[0];
key[1] = (unsigned char)(((key_56[0] << 7) & 0xFF) | (key_56[1] >> 1));
key[2] = (unsigned char)(((key_56[1] << 6) & 0xFF) | (key_56[2] >> 2));
key[3] = (unsigned char)(((key_56[2] << 5) & 0xFF) | (key_56[3] >> 3));
key[4] = (unsigned char)(((key_56[3] << 4) & 0xFF) | (key_56[4] >> 4));
key[5] = (unsigned char)(((key_56[4] << 3) & 0xFF) | (key_56[5] >> 5));
key[6] = (unsigned char)(((key_56[5] << 2) & 0xFF) | (key_56[6] >> 6));
key[7] = (unsigned char) ((key_56[6] << 1) & 0xFF);
}
#ifdef USE_OPENSSL
/*
* Turns a 56 bit key into the 64 bit, odd parity key and sets the key. The
* key schedule ks is also set.
*/
static void setup_des_key(const unsigned char *key_56,
DES_key_schedule DESKEYARG(ks))
{
DES_cblock key;
/* Expand the 56-bit key to 64-bits */
extend_key_56_to_64(key_56, (char *) &key);
/* Set the key parity to odd */
DES_set_odd_parity(&key);
/* Set the key */
DES_set_key(&key, ks);
}
#elif defined(USE_GNUTLS_NETTLE)
static void setup_des_key(const unsigned char *key_56,
struct des_ctx *des)
{
char key[8];
/* Expand the 56-bit key to 64-bits */
extend_key_56_to_64(key_56, key);
/* Set the key parity to odd */
Curl_des_set_odd_parity((unsigned char *) key, sizeof(key));
/* Set the key */
des_set_key(des, (const uint8_t *) key);
}
#elif defined(USE_GNUTLS)
/*
* Turns a 56 bit key into the 64 bit, odd parity key and sets the key.
*/
static void setup_des_key(const unsigned char *key_56,
gcry_cipher_hd_t *des)
{
char key[8];
/* Expand the 56-bit key to 64-bits */
extend_key_56_to_64(key_56, key);
/* Set the key parity to odd */
Curl_des_set_odd_parity((unsigned char *) key, sizeof(key));
/* Set the key */
gcry_cipher_setkey(*des, key, sizeof(key));
}
#elif defined(USE_NSS)
/*
* Expands a 56 bit key KEY_56 to 64 bit and encrypts 64 bit of data, using
* the expanded key. The caller is responsible for giving 64 bit of valid
* data is IN and (at least) 64 bit large buffer as OUT.
*/
static bool encrypt_des(const unsigned char *in, unsigned char *out,
const unsigned char *key_56)
{
const CK_MECHANISM_TYPE mech = CKM_DES_ECB; /* DES cipher in ECB mode */
PK11SlotInfo *slot = NULL;
char key[8]; /* expanded 64 bit key */
SECItem key_item;
PK11SymKey *symkey = NULL;
SECItem *param = NULL;
PK11Context *ctx = NULL;
int out_len; /* not used, required by NSS */
bool rv = FALSE;
/* use internal slot for DES encryption (requires NSS to be initialized) */
slot = PK11_GetInternalKeySlot();
if(!slot)
return FALSE;
/* Expand the 56-bit key to 64-bits */
extend_key_56_to_64(key_56, key);
/* Set the key parity to odd */
Curl_des_set_odd_parity((unsigned char *) key, sizeof(key));
/* Import the key */
key_item.data = (unsigned char *)key;
key_item.len = sizeof(key);
symkey = PK11_ImportSymKey(slot, mech, PK11_OriginUnwrap, CKA_ENCRYPT,
&key_item, NULL);
if(!symkey)
goto fail;
/* Create the DES encryption context */
param = PK11_ParamFromIV(mech, /* no IV in ECB mode */ NULL);
if(!param)
goto fail;
ctx = PK11_CreateContextBySymKey(mech, CKA_ENCRYPT, symkey, param);
if(!ctx)
goto fail;
/* Perform the encryption */
if(SECSuccess == PK11_CipherOp(ctx, out, &out_len, /* outbuflen */ 8,
(unsigned char *)in, /* inbuflen */ 8)
&& SECSuccess == PK11_Finalize(ctx))
rv = /* all OK */ TRUE;
fail:
/* cleanup */
if(ctx)
PK11_DestroyContext(ctx, PR_TRUE);
if(symkey)
PK11_FreeSymKey(symkey);
if(param)
SECITEM_FreeItem(param, PR_TRUE);
PK11_FreeSlot(slot);
return rv;
}
#elif defined(USE_MBEDTLS)
static bool encrypt_des(const unsigned char *in, unsigned char *out,
const unsigned char *key_56)
{
mbedtls_des_context ctx;
char key[8];
/* Expand the 56-bit key to 64-bits */
extend_key_56_to_64(key_56, key);
/* Set the key parity to odd */
mbedtls_des_key_set_parity((unsigned char *) key);
/* Perform the encryption */
mbedtls_des_init(&ctx);
mbedtls_des_setkey_enc(&ctx, (unsigned char *) key);
return mbedtls_des_crypt_ecb(&ctx, in, out) == 0;
}
#elif defined(USE_DARWINSSL)
static bool encrypt_des(const unsigned char *in, unsigned char *out,
const unsigned char *key_56)
{
char key[8];
size_t out_len;
CCCryptorStatus err;
/* Expand the 56-bit key to 64-bits */
extend_key_56_to_64(key_56, key);
/* Set the key parity to odd */
Curl_des_set_odd_parity((unsigned char *) key, sizeof(key));
/* Perform the encryption */
err = CCCrypt(kCCEncrypt, kCCAlgorithmDES, kCCOptionECBMode, key,
kCCKeySizeDES, NULL, in, 8 /* inbuflen */, out,
8 /* outbuflen */, &out_len);
return err == kCCSuccess;
}
#elif defined(USE_OS400CRYPTO)
static bool encrypt_des(const unsigned char *in, unsigned char *out,
const unsigned char *key_56)
{
char key[8];
_CIPHER_Control_T ctl;
/* Setup the cipher control structure */
ctl.Func_ID = ENCRYPT_ONLY;
ctl.Data_Len = sizeof(key);
/* Expand the 56-bit key to 64-bits */
extend_key_56_to_64(key_56, ctl.Crypto_Key);
/* Set the key parity to odd */
Curl_des_set_odd_parity((unsigned char *) ctl.Crypto_Key, ctl.Data_Len);
/* Perform the encryption */
_CIPHER((_SPCPTR *) &out, &ctl, (_SPCPTR *) &in);
return TRUE;
}
#elif defined(USE_WIN32_CRYPTO)
static bool encrypt_des(const unsigned char *in, unsigned char *out,
const unsigned char *key_56)
{
HCRYPTPROV hprov;
HCRYPTKEY hkey;
struct {
BLOBHEADER hdr;
unsigned int len;
char key[8];
} blob;
DWORD len = 8;
/* Acquire the crypto provider */
if(!CryptAcquireContext(&hprov, NULL, NULL, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT))
return FALSE;
/* Setup the key blob structure */
memset(&blob, 0, sizeof(blob));
blob.hdr.bType = PLAINTEXTKEYBLOB;
blob.hdr.bVersion = 2;
blob.hdr.aiKeyAlg = CALG_DES;
blob.len = sizeof(blob.key);
/* Expand the 56-bit key to 64-bits */
extend_key_56_to_64(key_56, blob.key);
/* Set the key parity to odd */
Curl_des_set_odd_parity((unsigned char *) blob.key, sizeof(blob.key));
/* Import the key */
if(!CryptImportKey(hprov, (BYTE *) &blob, sizeof(blob), 0, 0, &hkey)) {
CryptReleaseContext(hprov, 0);
return FALSE;
}
memcpy(out, in, 8);
/* Perform the encryption */
CryptEncrypt(hkey, 0, FALSE, 0, out, &len, len);
CryptDestroyKey(hkey);
CryptReleaseContext(hprov, 0);
return TRUE;
}
#endif /* defined(USE_WIN32_CRYPTO) */
/*
* takes a 21 byte array and treats it as 3 56-bit DES keys. The
* 8 byte plaintext is encrypted with each key and the resulting 24
* bytes are stored in the results array.
*/
void Curl_ntlm_core_lm_resp(const unsigned char *keys,
const unsigned char *plaintext,
unsigned char *results)
{
#ifdef USE_OPENSSL
DES_key_schedule ks;
setup_des_key(keys, DESKEY(ks));
DES_ecb_encrypt((DES_cblock*) plaintext, (DES_cblock*) results,
DESKEY(ks), DES_ENCRYPT);
setup_des_key(keys + 7, DESKEY(ks));
DES_ecb_encrypt((DES_cblock*) plaintext, (DES_cblock*) (results + 8),
DESKEY(ks), DES_ENCRYPT);
setup_des_key(keys + 14, DESKEY(ks));
DES_ecb_encrypt((DES_cblock*) plaintext, (DES_cblock*) (results + 16),
DESKEY(ks), DES_ENCRYPT);
#elif defined(USE_GNUTLS_NETTLE)
struct des_ctx des;
setup_des_key(keys, &des);
des_encrypt(&des, 8, results, plaintext);
setup_des_key(keys + 7, &des);
des_encrypt(&des, 8, results + 8, plaintext);
setup_des_key(keys + 14, &des);
des_encrypt(&des, 8, results + 16, plaintext);
#elif defined(USE_GNUTLS)
gcry_cipher_hd_t des;
gcry_cipher_open(&des, GCRY_CIPHER_DES, GCRY_CIPHER_MODE_ECB, 0);
setup_des_key(keys, &des);
gcry_cipher_encrypt(des, results, 8, plaintext, 8);
gcry_cipher_close(des);
gcry_cipher_open(&des, GCRY_CIPHER_DES, GCRY_CIPHER_MODE_ECB, 0);
setup_des_key(keys + 7, &des);
gcry_cipher_encrypt(des, results + 8, 8, plaintext, 8);
gcry_cipher_close(des);
gcry_cipher_open(&des, GCRY_CIPHER_DES, GCRY_CIPHER_MODE_ECB, 0);
setup_des_key(keys + 14, &des);
gcry_cipher_encrypt(des, results + 16, 8, plaintext, 8);
gcry_cipher_close(des);
#elif defined(USE_NSS) || defined(USE_MBEDTLS) || defined(USE_DARWINSSL) \
|| defined(USE_OS400CRYPTO) || defined(USE_WIN32_CRYPTO)
encrypt_des(plaintext, results, keys);
encrypt_des(plaintext, results + 8, keys + 7);
encrypt_des(plaintext, results + 16, keys + 14);
#endif
}
/*
* Set up lanmanager hashed password
*/
CURLcode Curl_ntlm_core_mk_lm_hash(struct Curl_easy *data,
const char *password,
unsigned char *lmbuffer /* 21 bytes */)
{
CURLcode result;
unsigned char pw[14];
static const unsigned char magic[] = {
0x4B, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25 /* i.e. KGS!@#$% */
};
size_t len = CURLMIN(strlen(password), 14);
Curl_strntoupper((char *)pw, password, len);
memset(&pw[len], 0, 14 - len);
/*
* The LanManager hashed password needs to be created using the
* password in the network encoding not the host encoding.
*/
result = Curl_convert_to_network(data, (char *)pw, 14);
if(result)
return result;
{
/* Create LanManager hashed password. */
#ifdef USE_OPENSSL
DES_key_schedule ks;
setup_des_key(pw, DESKEY(ks));
DES_ecb_encrypt((DES_cblock *)magic, (DES_cblock *)lmbuffer,
DESKEY(ks), DES_ENCRYPT);
setup_des_key(pw + 7, DESKEY(ks));
DES_ecb_encrypt((DES_cblock *)magic, (DES_cblock *)(lmbuffer + 8),
DESKEY(ks), DES_ENCRYPT);
#elif defined(USE_GNUTLS_NETTLE)
struct des_ctx des;
setup_des_key(pw, &des);
des_encrypt(&des, 8, lmbuffer, magic);
setup_des_key(pw + 7, &des);
des_encrypt(&des, 8, lmbuffer + 8, magic);
#elif defined(USE_GNUTLS)
gcry_cipher_hd_t des;
gcry_cipher_open(&des, GCRY_CIPHER_DES, GCRY_CIPHER_MODE_ECB, 0);
setup_des_key(pw, &des);
gcry_cipher_encrypt(des, lmbuffer, 8, magic, 8);
gcry_cipher_close(des);
gcry_cipher_open(&des, GCRY_CIPHER_DES, GCRY_CIPHER_MODE_ECB, 0);
setup_des_key(pw + 7, &des);
gcry_cipher_encrypt(des, lmbuffer + 8, 8, magic, 8);
gcry_cipher_close(des);
#elif defined(USE_NSS) || defined(USE_MBEDTLS) || defined(USE_DARWINSSL) \
|| defined(USE_OS400CRYPTO) || defined(USE_WIN32_CRYPTO)
encrypt_des(magic, lmbuffer, pw);
encrypt_des(magic, lmbuffer + 8, pw + 7);
#endif
memset(lmbuffer + 16, 0, 21 - 16);
}
return CURLE_OK;
}
#ifdef USE_NTRESPONSES
static void ascii_to_unicode_le(unsigned char *dest, const char *src,
size_t srclen)
{
size_t i;
for(i = 0; i < srclen; i++) {
dest[2 * i] = (unsigned char)src[i];
dest[2 * i + 1] = '\0';
}
}
#if defined(USE_NTLM_V2) && !defined(USE_WINDOWS_SSPI)
static void ascii_uppercase_to_unicode_le(unsigned char *dest,
const char *src, size_t srclen)
{
size_t i;
for(i = 0; i < srclen; i++) {
dest[2 * i] = (unsigned char)(Curl_raw_toupper(src[i]));
dest[2 * i + 1] = '\0';
}
}
#endif /* USE_NTLM_V2 && !USE_WINDOWS_SSPI */
/*
* Set up nt hashed passwords
* @unittest: 1600
*/
CURLcode Curl_ntlm_core_mk_nt_hash(struct Curl_easy *data,
const char *password,
unsigned char *ntbuffer /* 21 bytes */)
{
size_t len = strlen(password);
unsigned char *pw = len ? malloc(len * 2) : strdup("");
CURLcode result;
if(!pw)
return CURLE_OUT_OF_MEMORY;
ascii_to_unicode_le(pw, password, len);
/*
* The NT hashed password needs to be created using the password in the
* network encoding not the host encoding.
*/
result = Curl_convert_to_network(data, (char *)pw, len * 2);
if(result)
return result;
{
/* Create NT hashed password. */
#ifdef USE_OPENSSL
MD4_CTX MD4pw;
MD4_Init(&MD4pw);
MD4_Update(&MD4pw, pw, 2 * len);
MD4_Final(ntbuffer, &MD4pw);
#elif defined(USE_GNUTLS_NETTLE)
struct md4_ctx MD4pw;
md4_init(&MD4pw);
md4_update(&MD4pw, (unsigned int)(2 * len), pw);
md4_digest(&MD4pw, MD4_DIGEST_SIZE, ntbuffer);
#elif defined(USE_GNUTLS)
gcry_md_hd_t MD4pw;
gcry_md_open(&MD4pw, GCRY_MD_MD4, 0);
gcry_md_write(MD4pw, pw, 2 * len);
memcpy(ntbuffer, gcry_md_read(MD4pw, 0), MD4_DIGEST_LENGTH);
gcry_md_close(MD4pw);
#elif defined(USE_NSS)
Curl_md4it(ntbuffer, pw, 2 * len);
#elif defined(USE_MBEDTLS)
#if defined(MBEDTLS_MD4_C)
mbedtls_md4(pw, 2 * len, ntbuffer);
#else
Curl_md4it(ntbuffer, pw, 2 * len);
#endif
#elif defined(USE_DARWINSSL)
(void)CC_MD4(pw, (CC_LONG)(2 * len), ntbuffer);
#elif defined(USE_OS400CRYPTO)
Curl_md4it(ntbuffer, pw, 2 * len);
#elif defined(USE_WIN32_CRYPTO)
HCRYPTPROV hprov;
if(CryptAcquireContext(&hprov, NULL, NULL, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT)) {
HCRYPTHASH hhash;
if(CryptCreateHash(hprov, CALG_MD4, 0, 0, &hhash)) {
DWORD length = 16;
CryptHashData(hhash, pw, (unsigned int)len * 2, 0);
CryptGetHashParam(hhash, HP_HASHVAL, ntbuffer, &length, 0);
CryptDestroyHash(hhash);
}
CryptReleaseContext(hprov, 0);
}
#endif
memset(ntbuffer + 16, 0, 21 - 16);
}
free(pw);
return CURLE_OK;
}
#if defined(USE_NTLM_V2) && !defined(USE_WINDOWS_SSPI)
/* This returns the HMAC MD5 digest */
CURLcode Curl_hmac_md5(const unsigned char *key, unsigned int keylen,
const unsigned char *data, unsigned int datalen,
unsigned char *output)
{
HMAC_context *ctxt = Curl_HMAC_init(Curl_HMAC_MD5, key, keylen);
if(!ctxt)
return CURLE_OUT_OF_MEMORY;
/* Update the digest with the given challenge */
Curl_HMAC_update(ctxt, data, datalen);
/* Finalise the digest */
Curl_HMAC_final(ctxt, output);
return CURLE_OK;
}
/* This creates the NTLMv2 hash by using NTLM hash as the key and Unicode
* (uppercase UserName + Domain) as the data
*/
CURLcode Curl_ntlm_core_mk_ntlmv2_hash(const char *user, size_t userlen,
const char *domain, size_t domlen,
unsigned char *ntlmhash,
unsigned char *ntlmv2hash)
{
/* Unicode representation */
size_t identity_len;
unsigned char *identity;
CURLcode result = CURLE_OK;
/* we do the length checks below separately to avoid integer overflow risk
on extreme data lengths */
if((userlen > SIZE_T_MAX/2) ||
(domlen > SIZE_T_MAX/2) ||
((userlen + domlen) > SIZE_T_MAX/2))
return CURLE_OUT_OF_MEMORY;
identity_len = (userlen + domlen) * 2;
identity = malloc(identity_len);
if(!identity)
return CURLE_OUT_OF_MEMORY;
ascii_uppercase_to_unicode_le(identity, user, userlen);
ascii_to_unicode_le(identity + (userlen << 1), domain, domlen);
result = Curl_hmac_md5(ntlmhash, 16, identity, curlx_uztoui(identity_len),
ntlmv2hash);
free(identity);
return result;
}
/*
* Curl_ntlm_core_mk_ntlmv2_resp()
*
* This creates the NTLMv2 response as set in the ntlm type-3 message.
*
* Parameters:
*
* ntlmv2hash [in] - The ntlmv2 hash (16 bytes)
* challenge_client [in] - The client nonce (8 bytes)
* ntlm [in] - The ntlm data struct being used to read TargetInfo
and Server challenge received in the type-2 message
* ntresp [out] - The address where a pointer to newly allocated
* memory holding the NTLMv2 response.
* ntresp_len [out] - The length of the output message.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_ntlm_core_mk_ntlmv2_resp(unsigned char *ntlmv2hash,
unsigned char *challenge_client,
struct ntlmdata *ntlm,
unsigned char **ntresp,
unsigned int *ntresp_len)
{
/* NTLMv2 response structure :
------------------------------------------------------------------------------
0 HMAC MD5 16 bytes
------BLOB--------------------------------------------------------------------
16 Signature 0x01010000
20 Reserved long (0x00000000)
24 Timestamp LE, 64-bit signed value representing the number of
tenths of a microsecond since January 1, 1601.
32 Client Nonce 8 bytes
40 Unknown 4 bytes
44 Target Info N bytes (from the type-2 message)
44+N Unknown 4 bytes
------------------------------------------------------------------------------
*/
unsigned int len = 0;
unsigned char *ptr = NULL;
unsigned char hmac_output[NTLM_HMAC_MD5_LEN];
curl_off_t tw;
CURLcode result = CURLE_OK;
#if CURL_SIZEOF_CURL_OFF_T < 8
#error "this section needs 64bit support to work"
#endif
/* Calculate the timestamp */
#ifdef DEBUGBUILD
char *force_timestamp = getenv("CURL_FORCETIME");
if(force_timestamp)
tw = CURL_OFF_T_C(11644473600) * 10000000;
else
#endif
tw = ((curl_off_t)time(NULL) + CURL_OFF_T_C(11644473600)) * 10000000;
/* Calculate the response len */
len = NTLM_HMAC_MD5_LEN + NTLMv2_BLOB_LEN;
/* Allocate the response */
ptr = calloc(1, len);
if(!ptr)
return CURLE_OUT_OF_MEMORY;
/* Create the BLOB structure */
snprintf((char *)ptr + NTLM_HMAC_MD5_LEN, NTLMv2_BLOB_LEN,
"%c%c%c%c" /* NTLMv2_BLOB_SIGNATURE */
"%c%c%c%c", /* Reserved = 0 */
NTLMv2_BLOB_SIGNATURE[0], NTLMv2_BLOB_SIGNATURE[1],
NTLMv2_BLOB_SIGNATURE[2], NTLMv2_BLOB_SIGNATURE[3],
0, 0, 0, 0);
Curl_write64_le(tw, ptr + 24);
memcpy(ptr + 32, challenge_client, 8);
memcpy(ptr + 44, ntlm->target_info, ntlm->target_info_len);
/* Concatenate the Type 2 challenge with the BLOB and do HMAC MD5 */
memcpy(ptr + 8, &ntlm->nonce[0], 8);
result = Curl_hmac_md5(ntlmv2hash, NTLM_HMAC_MD5_LEN, ptr + 8,
NTLMv2_BLOB_LEN + 8, hmac_output);
if(result) {
free(ptr);
return result;
}
/* Concatenate the HMAC MD5 output with the BLOB */
memcpy(ptr, hmac_output, NTLM_HMAC_MD5_LEN);
/* Return the response */
*ntresp = ptr;
*ntresp_len = len;
return result;
}
/*
* Curl_ntlm_core_mk_lmv2_resp()
*
* This creates the LMv2 response as used in the ntlm type-3 message.
*
* Parameters:
*
* ntlmv2hash [in] - The ntlmv2 hash (16 bytes)
* challenge_client [in] - The client nonce (8 bytes)
* challenge_client [in] - The server challenge (8 bytes)
* lmresp [out] - The LMv2 response (24 bytes)
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_ntlm_core_mk_lmv2_resp(unsigned char *ntlmv2hash,
unsigned char *challenge_client,
unsigned char *challenge_server,
unsigned char *lmresp)
{
unsigned char data[16];
unsigned char hmac_output[16];
CURLcode result = CURLE_OK;
memcpy(&data[0], challenge_server, 8);
memcpy(&data[8], challenge_client, 8);
result = Curl_hmac_md5(ntlmv2hash, 16, &data[0], 16, hmac_output);
if(result)
return result;
/* Concatenate the HMAC MD5 output with the client nonce */
memcpy(lmresp, hmac_output, 16);
memcpy(lmresp + 16, challenge_client, 8);
return result;
}
#endif /* USE_NTLM_V2 && !USE_WINDOWS_SSPI */
#endif /* USE_NTRESPONSES */
#endif /* !USE_WINDOWS_SSPI || USE_WIN32_CRYPTO */
#endif /* USE_NTLM */
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