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curl/lib/curl_ntlm_msgs.c
Steve Holme ee40136f6c sasl: Post DIGEST-MD5 SSPI code tidy up 
* Added comments to SSPI NTLM message generation
* Added comments to native DIGEST-MD5 code
* Removed redundant identity pointer
2014-04-06 13:30:52 +01:00

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2014, 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 http://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"
#ifdef USE_NTLM
/*
* NTLM details:
*
* http://davenport.sourceforge.net/ntlm.html
* http://www.innovation.ch/java/ntlm.html
*/
#define DEBUG_ME 0
#include "urldata.h"
#include "non-ascii.h"
#include "sendf.h"
#include "curl_base64.h"
#include "curl_ntlm_core.h"
#include "curl_gethostname.h"
#include "curl_multibyte.h"
#include "warnless.h"
#include "curl_memory.h"
#ifdef USE_WINDOWS_SSPI
# include "curl_sspi.h"
#endif
#include "vtls/vtls.h"
#define BUILDING_CURL_NTLM_MSGS_C
#include "curl_ntlm_msgs.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
/* The last #include file should be: */
#include "memdebug.h"
/* "NTLMSSP" signature is always in ASCII regardless of the platform */
#define NTLMSSP_SIGNATURE "\x4e\x54\x4c\x4d\x53\x53\x50"
#define SHORTPAIR(x) ((x) & 0xff), (((x) >> 8) & 0xff)
#define LONGQUARTET(x) ((x) & 0xff), (((x) >> 8) & 0xff), \
(((x) >> 16) & 0xff), (((x) >> 24) & 0xff)
#if DEBUG_ME
# define DEBUG_OUT(x) x
static void ntlm_print_flags(FILE *handle, unsigned long flags)
{
if(flags & NTLMFLAG_NEGOTIATE_UNICODE)
fprintf(handle, "NTLMFLAG_NEGOTIATE_UNICODE ");
if(flags & NTLMFLAG_NEGOTIATE_OEM)
fprintf(handle, "NTLMFLAG_NEGOTIATE_OEM ");
if(flags & NTLMFLAG_REQUEST_TARGET)
fprintf(handle, "NTLMFLAG_REQUEST_TARGET ");
if(flags & (1<<3))
fprintf(handle, "NTLMFLAG_UNKNOWN_3 ");
if(flags & NTLMFLAG_NEGOTIATE_SIGN)
fprintf(handle, "NTLMFLAG_NEGOTIATE_SIGN ");
if(flags & NTLMFLAG_NEGOTIATE_SEAL)
fprintf(handle, "NTLMFLAG_NEGOTIATE_SEAL ");
if(flags & NTLMFLAG_NEGOTIATE_DATAGRAM_STYLE)
fprintf(handle, "NTLMFLAG_NEGOTIATE_DATAGRAM_STYLE ");
if(flags & NTLMFLAG_NEGOTIATE_LM_KEY)
fprintf(handle, "NTLMFLAG_NEGOTIATE_LM_KEY ");
if(flags & NTLMFLAG_NEGOTIATE_NETWARE)
fprintf(handle, "NTLMFLAG_NEGOTIATE_NETWARE ");
if(flags & NTLMFLAG_NEGOTIATE_NTLM_KEY)
fprintf(handle, "NTLMFLAG_NEGOTIATE_NTLM_KEY ");
if(flags & (1<<10))
fprintf(handle, "NTLMFLAG_UNKNOWN_10 ");
if(flags & NTLMFLAG_NEGOTIATE_ANONYMOUS)
fprintf(handle, "NTLMFLAG_NEGOTIATE_ANONYMOUS ");
if(flags & NTLMFLAG_NEGOTIATE_DOMAIN_SUPPLIED)
fprintf(handle, "NTLMFLAG_NEGOTIATE_DOMAIN_SUPPLIED ");
if(flags & NTLMFLAG_NEGOTIATE_WORKSTATION_SUPPLIED)
fprintf(handle, "NTLMFLAG_NEGOTIATE_WORKSTATION_SUPPLIED ");
if(flags & NTLMFLAG_NEGOTIATE_LOCAL_CALL)
fprintf(handle, "NTLMFLAG_NEGOTIATE_LOCAL_CALL ");
if(flags & NTLMFLAG_NEGOTIATE_ALWAYS_SIGN)
fprintf(handle, "NTLMFLAG_NEGOTIATE_ALWAYS_SIGN ");
if(flags & NTLMFLAG_TARGET_TYPE_DOMAIN)
fprintf(handle, "NTLMFLAG_TARGET_TYPE_DOMAIN ");
if(flags & NTLMFLAG_TARGET_TYPE_SERVER)
fprintf(handle, "NTLMFLAG_TARGET_TYPE_SERVER ");
if(flags & NTLMFLAG_TARGET_TYPE_SHARE)
fprintf(handle, "NTLMFLAG_TARGET_TYPE_SHARE ");
if(flags & NTLMFLAG_NEGOTIATE_NTLM2_KEY)
fprintf(handle, "NTLMFLAG_NEGOTIATE_NTLM2_KEY ");
if(flags & NTLMFLAG_REQUEST_INIT_RESPONSE)
fprintf(handle, "NTLMFLAG_REQUEST_INIT_RESPONSE ");
if(flags & NTLMFLAG_REQUEST_ACCEPT_RESPONSE)
fprintf(handle, "NTLMFLAG_REQUEST_ACCEPT_RESPONSE ");
if(flags & NTLMFLAG_REQUEST_NONNT_SESSION_KEY)
fprintf(handle, "NTLMFLAG_REQUEST_NONNT_SESSION_KEY ");
if(flags & NTLMFLAG_NEGOTIATE_TARGET_INFO)
fprintf(handle, "NTLMFLAG_NEGOTIATE_TARGET_INFO ");
if(flags & (1<<24))
fprintf(handle, "NTLMFLAG_UNKNOWN_24 ");
if(flags & (1<<25))
fprintf(handle, "NTLMFLAG_UNKNOWN_25 ");
if(flags & (1<<26))
fprintf(handle, "NTLMFLAG_UNKNOWN_26 ");
if(flags & (1<<27))
fprintf(handle, "NTLMFLAG_UNKNOWN_27 ");
if(flags & (1<<28))
fprintf(handle, "NTLMFLAG_UNKNOWN_28 ");
if(flags & NTLMFLAG_NEGOTIATE_128)
fprintf(handle, "NTLMFLAG_NEGOTIATE_128 ");
if(flags & NTLMFLAG_NEGOTIATE_KEY_EXCHANGE)
fprintf(handle, "NTLMFLAG_NEGOTIATE_KEY_EXCHANGE ");
if(flags & NTLMFLAG_NEGOTIATE_56)
fprintf(handle, "NTLMFLAG_NEGOTIATE_56 ");
}
static void ntlm_print_hex(FILE *handle, const char *buf, size_t len)
{
const char *p = buf;
(void)handle;
fprintf(stderr, "0x");
while(len-- > 0)
fprintf(stderr, "%02.2x", (unsigned int)*p++);
}
#else
# define DEBUG_OUT(x) Curl_nop_stmt
#endif
#ifndef USE_WINDOWS_SSPI
/*
* This function converts from the little endian format used in the
* incoming package to whatever endian format we're using natively.
* Argument is a pointer to a 4 byte buffer.
*/
static unsigned int readint_le(unsigned char *buf)
{
return ((unsigned int)buf[0]) | ((unsigned int)buf[1] << 8) |
((unsigned int)buf[2] << 16) | ((unsigned int)buf[3] << 24);
}
/*
* This function converts from the little endian format used in the incoming
* package to whatever endian format we're using natively. Argument is a
* pointer to a 2 byte buffer.
*/
static unsigned int readshort_le(unsigned char *buf)
{
return ((unsigned int)buf[0]) | ((unsigned int)buf[1] << 8);
}
/*
* Curl_ntlm_decode_type2_target()
*
* This is used to decode the "target info" in the ntlm type-2 message
* received.
*
* Parameters:
*
* data [in] - Pointer to the session handle
* buffer [in] - The decoded base64 ntlm header of Type 2
* size [in] - The input buffer size, atleast 32 bytes
* ntlm [in] - Pointer to ntlm data struct being used and modified.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_ntlm_decode_type2_target(struct SessionHandle *data,
unsigned char *buffer,
size_t size,
struct ntlmdata *ntlm)
{
unsigned int target_info_len = 0;
unsigned int target_info_offset = 0;
Curl_safefree(ntlm->target_info);
ntlm->target_info_len = 0;
if(size >= 48) {
target_info_len = readshort_le(&buffer[40]);
target_info_offset = readint_le(&buffer[44]);
if(target_info_len > 0) {
if(((target_info_offset + target_info_len) > size) ||
(target_info_offset < 48)) {
infof(data, "NTLM handshake failure (bad type-2 message). "
"Target Info Offset Len is set incorrect by the peer\n");
return CURLE_REMOTE_ACCESS_DENIED;
}
ntlm->target_info = malloc(target_info_len);
if(!ntlm->target_info)
return CURLE_OUT_OF_MEMORY;
memcpy(ntlm->target_info, &buffer[target_info_offset], target_info_len);
ntlm->target_info_len = target_info_len;
}
}
return CURLE_OK;
}
#endif
/*
NTLM message structure notes:
A 'short' is a 'network short', a little-endian 16-bit unsigned value.
A 'long' is a 'network long', a little-endian, 32-bit unsigned value.
A 'security buffer' represents a triplet used to point to a buffer,
consisting of two shorts and one long:
1. A 'short' containing the length of the buffer content in bytes.
2. A 'short' containing the allocated space for the buffer in bytes.
3. A 'long' containing the offset to the start of the buffer in bytes,
from the beginning of the NTLM message.
*/
/*
* Curl_ntlm_decode_type2_message()
*
* This is used to decode a ntlm type-2 message received from a HTTP or SASL
* based (such as SMTP, POP3 or IMAP) server. The message is first decoded
* from a base64 string into a raw ntlm message and checked for validity
* before the appropriate data for creating a type-3 message is written to
* the given ntlm data structure.
*
* Parameters:
*
* data [in] - Pointer to session handle.
* header [in] - Pointer to the input buffer.
* ntlm [in] - Pointer to ntlm data struct being used and modified.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_ntlm_decode_type2_message(struct SessionHandle *data,
const char *header,
struct ntlmdata *ntlm)
{
#ifndef USE_WINDOWS_SSPI
static const char type2_marker[] = { 0x02, 0x00, 0x00, 0x00 };
#endif
/* NTLM type-2 message structure:
Index Description Content
0 NTLMSSP Signature Null-terminated ASCII "NTLMSSP"
(0x4e544c4d53535000)
8 NTLM Message Type long (0x02000000)
12 Target Name security buffer
20 Flags long
24 Challenge 8 bytes
(32) Context 8 bytes (two consecutive longs) (*)
(40) Target Information security buffer (*)
(48) OS Version Structure 8 bytes (*)
32 (48) (56) Start of data block (*)
(*) -> Optional
*/
size_t size = 0;
unsigned char *buffer = NULL;
CURLcode error;
#if defined(CURL_DISABLE_VERBOSE_STRINGS) || defined(USE_WINDOWS_SSPI)
(void)data;
#endif
error = Curl_base64_decode(header, &buffer, &size);
if(error)
return error;
if(!buffer) {
infof(data, "NTLM handshake failure (unhandled condition)\n");
return CURLE_REMOTE_ACCESS_DENIED;
}
#ifdef USE_WINDOWS_SSPI
ntlm->type_2 = malloc(size + 1);
if(ntlm->type_2 == NULL) {
free(buffer);
return CURLE_OUT_OF_MEMORY;
}
ntlm->n_type_2 = curlx_uztoul(size);
memcpy(ntlm->type_2, buffer, size);
#else
ntlm->flags = 0;
if((size < 32) ||
(memcmp(buffer, NTLMSSP_SIGNATURE, 8) != 0) ||
(memcmp(buffer + 8, type2_marker, sizeof(type2_marker)) != 0)) {
/* This was not a good enough type-2 message */
free(buffer);
infof(data, "NTLM handshake failure (bad type-2 message)\n");
return CURLE_REMOTE_ACCESS_DENIED;
}
ntlm->flags = readint_le(&buffer[20]);
memcpy(ntlm->nonce, &buffer[24], 8);
if(ntlm->flags & NTLMFLAG_NEGOTIATE_TARGET_INFO) {
error = Curl_ntlm_decode_type2_target(data, buffer, size, ntlm);
if(error) {
free(buffer);
infof(data, "NTLM handshake failure (bad type-2 message)\n");
return error;
}
}
DEBUG_OUT({
fprintf(stderr, "**** TYPE2 header flags=0x%08.8lx ", ntlm->flags);
ntlm_print_flags(stderr, ntlm->flags);
fprintf(stderr, "\n nonce=");
ntlm_print_hex(stderr, (char *)ntlm->nonce, 8);
fprintf(stderr, "\n****\n");
fprintf(stderr, "**** Header %s\n ", header);
});
#endif
free(buffer);
return CURLE_OK;
}
#ifdef USE_WINDOWS_SSPI
void Curl_ntlm_sspi_cleanup(struct ntlmdata *ntlm)
{
Curl_safefree(ntlm->type_2);
if(ntlm->has_handles) {
s_pSecFn->DeleteSecurityContext(&ntlm->c_handle);
s_pSecFn->FreeCredentialsHandle(&ntlm->handle);
ntlm->has_handles = 0;
}
Curl_sspi_free_identity(ntlm->p_identity);
ntlm->p_identity = NULL;
}
#endif
#ifndef USE_WINDOWS_SSPI
/* copy the source to the destination and fill in zeroes in every
other destination byte! */
static void unicodecpy(unsigned char *dest, const char *src, size_t length)
{
size_t i;
for(i = 0; i < length; i++) {
dest[2 * i] = (unsigned char)src[i];
dest[2 * i + 1] = '\0';
}
}
#endif
/*
* Curl_ntlm_create_type1_message()
*
* This is used to generate an already encoded NTLM type-1 message ready for
* sending to the recipient, be it a HTTP or SASL based (such as SMTP, POP3
* or IMAP) server, using the appropriate compile time crypo API.
*
* Parameters:
*
* userp [in] - The user name in the format User or Domain\User.
* passdwp [in] - The user's password.
* ntlm [in/out] - The ntlm data struct being used and modified.
* outptr [in/out] - The address where a pointer to newly allocated memory
* holding the result will be stored upon completion.
* outlen [out] - The length of the output message.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_ntlm_create_type1_message(const char *userp,
const char *passwdp,
struct ntlmdata *ntlm,
char **outptr,
size_t *outlen)
{
/* NTLM type-1 message structure:
Index Description Content
0 NTLMSSP Signature Null-terminated ASCII "NTLMSSP"
(0x4e544c4d53535000)
8 NTLM Message Type long (0x01000000)
12 Flags long
(16) Supplied Domain security buffer (*)
(24) Supplied Workstation security buffer (*)
(32) OS Version Structure 8 bytes (*)
(32) (40) Start of data block (*)
(*) -> Optional
*/
unsigned char ntlmbuf[NTLM_BUFSIZE];
size_t size;
#ifdef USE_WINDOWS_SSPI
SecBuffer type_1_buf;
SecBufferDesc type_1_desc;
SECURITY_STATUS status;
unsigned long attrs;
TimeStamp tsDummy; /* For Windows 9x compatibility of SSPI calls */
Curl_ntlm_sspi_cleanup(ntlm);
if(userp && *userp) {
CURLcode result;
/* Populate our identity structure */
result = Curl_create_sspi_identity(userp, passwdp, &ntlm->identity);
if(result)
return result;
/* Allow proper cleanup of the identity structure */
ntlm->p_identity = &ntlm->identity;
}
else
/* Use the current Windows user */
ntlm->p_identity = NULL;
/* Acquire our credientials handle */
status = s_pSecFn->AcquireCredentialsHandle(NULL,
(TCHAR *) TEXT("NTLM"),
SECPKG_CRED_OUTBOUND, NULL,
ntlm->p_identity, NULL, NULL,
&ntlm->handle, &tsDummy);
if(status != SEC_E_OK)
return CURLE_OUT_OF_MEMORY;
/* Setup the type-1 "output" security buffer */
type_1_desc.ulVersion = SECBUFFER_VERSION;
type_1_desc.cBuffers = 1;
type_1_desc.pBuffers = &type_1_buf;
type_1_buf.cbBuffer = NTLM_BUFSIZE;
type_1_buf.BufferType = SECBUFFER_TOKEN;
type_1_buf.pvBuffer = ntlmbuf;
/* Generate our type-1 message */
status = s_pSecFn->InitializeSecurityContext(&ntlm->handle, NULL,
(TCHAR *) TEXT(""),
ISC_REQ_CONFIDENTIALITY |
ISC_REQ_REPLAY_DETECT |
ISC_REQ_CONNECTION,
0, SECURITY_NETWORK_DREP,
NULL, 0,
&ntlm->c_handle, &type_1_desc,
&attrs, &tsDummy);
if(status == SEC_I_COMPLETE_AND_CONTINUE ||
status == SEC_I_CONTINUE_NEEDED)
s_pSecFn->CompleteAuthToken(&ntlm->c_handle, &type_1_desc);
else if(status != SEC_E_OK) {
s_pSecFn->FreeCredentialsHandle(&ntlm->handle);
return CURLE_RECV_ERROR;
}
ntlm->has_handles = 1;
size = type_1_buf.cbBuffer;
#else
const char *host = ""; /* empty */
const char *domain = ""; /* empty */
size_t hostlen = 0;
size_t domlen = 0;
size_t hostoff = 0;
size_t domoff = hostoff + hostlen; /* This is 0: remember that host and
domain are empty */
(void)userp;
(void)passwdp;
(void)ntlm;
#if USE_NTLM2SESSION
#define NTLM2FLAG NTLMFLAG_NEGOTIATE_NTLM2_KEY
#else
#define NTLM2FLAG 0
#endif
snprintf((char *)ntlmbuf, NTLM_BUFSIZE,
NTLMSSP_SIGNATURE "%c"
"\x01%c%c%c" /* 32-bit type = 1 */
"%c%c%c%c" /* 32-bit NTLM flag field */
"%c%c" /* domain length */
"%c%c" /* domain allocated space */
"%c%c" /* domain name offset */
"%c%c" /* 2 zeroes */
"%c%c" /* host length */
"%c%c" /* host allocated space */
"%c%c" /* host name offset */
"%c%c" /* 2 zeroes */
"%s" /* host name */
"%s", /* domain string */
0, /* trailing zero */
0, 0, 0, /* part of type-1 long */
LONGQUARTET(NTLMFLAG_NEGOTIATE_OEM |
NTLMFLAG_REQUEST_TARGET |
NTLMFLAG_NEGOTIATE_NTLM_KEY |
NTLM2FLAG |
NTLMFLAG_NEGOTIATE_ALWAYS_SIGN),
SHORTPAIR(domlen),
SHORTPAIR(domlen),
SHORTPAIR(domoff),
0, 0,
SHORTPAIR(hostlen),
SHORTPAIR(hostlen),
SHORTPAIR(hostoff),
0, 0,
host, /* this is empty */
domain /* this is empty */);
/* Initial packet length */
size = 32 + hostlen + domlen;
#endif
DEBUG_OUT({
fprintf(stderr, "* TYPE1 header flags=0x%02.2x%02.2x%02.2x%02.2x "
"0x%08.8x ",
LONGQUARTET(NTLMFLAG_NEGOTIATE_OEM |
NTLMFLAG_REQUEST_TARGET |
NTLMFLAG_NEGOTIATE_NTLM_KEY |
NTLM2FLAG |
NTLMFLAG_NEGOTIATE_ALWAYS_SIGN),
NTLMFLAG_NEGOTIATE_OEM |
NTLMFLAG_REQUEST_TARGET |
NTLMFLAG_NEGOTIATE_NTLM_KEY |
NTLM2FLAG |
NTLMFLAG_NEGOTIATE_ALWAYS_SIGN);
ntlm_print_flags(stderr,
NTLMFLAG_NEGOTIATE_OEM |
NTLMFLAG_REQUEST_TARGET |
NTLMFLAG_NEGOTIATE_NTLM_KEY |
NTLM2FLAG |
NTLMFLAG_NEGOTIATE_ALWAYS_SIGN);
fprintf(stderr, "\n****\n");
});
/* Return with binary blob encoded into base64 */
return Curl_base64_encode(NULL, (char *)ntlmbuf, size, outptr, outlen);
}
/*
* Curl_ntlm_create_type3_message()
*
* This is used to generate an already encoded NTLM type-3 message ready for
* sending to the recipient, be it a HTTP or SASL based (such as SMTP, POP3
* or IMAP) server, using the appropriate compile time crypo API.
*
* Parameters:
*
* data [in] - The session handle.
* userp [in] - The user name in the format User or Domain\User.
* passdwp [in] - The user's password.
* ntlm [in/out] - The ntlm data struct being used and modified.
* outptr [in/out] - The address where a pointer to newly allocated memory
* holding the result will be stored upon completion.
* outlen [out] - The length of the output message.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_ntlm_create_type3_message(struct SessionHandle *data,
const char *userp,
const char *passwdp,
struct ntlmdata *ntlm,
char **outptr,
size_t *outlen)
{
/* NTLM type-3 message structure:
Index Description Content
0 NTLMSSP Signature Null-terminated ASCII "NTLMSSP"
(0x4e544c4d53535000)
8 NTLM Message Type long (0x03000000)
12 LM/LMv2 Response security buffer
20 NTLM/NTLMv2 Response security buffer
28 Target Name security buffer
36 User Name security buffer
44 Workstation Name security buffer
(52) Session Key security buffer (*)
(60) Flags long (*)
(64) OS Version Structure 8 bytes (*)
52 (64) (72) Start of data block
(*) -> Optional
*/
unsigned char ntlmbuf[NTLM_BUFSIZE];
size_t size;
#ifdef USE_WINDOWS_SSPI
SecBuffer type_2_buf;
SecBuffer type_3_buf;
SecBufferDesc type_2_desc;
SecBufferDesc type_3_desc;
SECURITY_STATUS status;
unsigned long attrs;
TimeStamp tsDummy; /* For Windows 9x compatibility of SSPI calls */
(void)passwdp;
(void)userp;
(void)data;
/* Setup the type-2 "input" security buffer */
type_2_desc.ulVersion = SECBUFFER_VERSION;
type_2_desc.cBuffers = 1;
type_2_desc.pBuffers = &type_2_buf;
type_2_buf.BufferType = SECBUFFER_TOKEN;
type_2_buf.pvBuffer = ntlm->type_2;
type_2_buf.cbBuffer = ntlm->n_type_2;
/* Setup the type-3 "output" security buffer */
type_3_desc.ulVersion = SECBUFFER_VERSION;
type_3_desc.cBuffers = 1;
type_3_desc.pBuffers = &type_3_buf;
type_3_buf.BufferType = SECBUFFER_TOKEN;
type_3_buf.pvBuffer = ntlmbuf;
type_3_buf.cbBuffer = NTLM_BUFSIZE;
/* Generate our type-3 message */
status = s_pSecFn->InitializeSecurityContext(&ntlm->handle,
&ntlm->c_handle,
(TCHAR *) TEXT(""),
ISC_REQ_CONFIDENTIALITY |
ISC_REQ_REPLAY_DETECT |
ISC_REQ_CONNECTION,
0, SECURITY_NETWORK_DREP,
&type_2_desc,
0, &ntlm->c_handle,
&type_3_desc,
&attrs, &tsDummy);
if(status != SEC_E_OK)
return CURLE_RECV_ERROR;
size = type_3_buf.cbBuffer;
Curl_ntlm_sspi_cleanup(ntlm);
#else
int lmrespoff;
unsigned char lmresp[24]; /* fixed-size */
#if USE_NTRESPONSES
int ntrespoff;
unsigned int ntresplen = 24;
unsigned char ntresp[24]; /* fixed-size */
unsigned char *ptr_ntresp = &ntresp[0];
unsigned char *ntlmv2resp = NULL;
#endif
bool unicode = (ntlm->flags & NTLMFLAG_NEGOTIATE_UNICODE) ? TRUE : FALSE;
char host[HOSTNAME_MAX + 1] = "";
const char *user;
const char *domain = "";
size_t hostoff = 0;
size_t useroff = 0;
size_t domoff = 0;
size_t hostlen = 0;
size_t userlen = 0;
size_t domlen = 0;
CURLcode res = CURLE_OK;
user = strchr(userp, '\\');
if(!user)
user = strchr(userp, '/');
if(user) {
domain = userp;
domlen = (user - domain);
user++;
}
else
user = userp;
if(user)
userlen = strlen(user);
/* Get the machine's un-qualified host name as NTLM doesn't like the fully
qualified domain name */
if(Curl_gethostname(host, sizeof(host))) {
infof(data, "gethostname() failed, continuing without!\n");
hostlen = 0;
}
else {
hostlen = strlen(host);
}
#if USE_NTRESPONSES
if(ntlm->target_info_len) {
unsigned char ntbuffer[0x18];
unsigned char entropy[8];
unsigned char ntlmv2hash[0x18];
#if defined(DEBUGBUILD)
/* Use static client nonce in debug (Test Suite) builds */
memcpy(entropy, "12345678", sizeof(entropy));
#else
/* Create an 8 byte random client nonce */
Curl_ssl_random(data, entropy, sizeof(entropy));
#endif
res = Curl_ntlm_core_mk_nt_hash(data, passwdp, ntbuffer);
if(res)
return res;
res = Curl_ntlm_core_mk_ntlmv2_hash(user, userlen, domain, domlen,
ntbuffer, ntlmv2hash);
if(res)
return res;
/* LMv2 response */
res = Curl_ntlm_core_mk_lmv2_resp(ntlmv2hash, entropy, &ntlm->nonce[0],
lmresp);
if(res)
return res;
/* NTLMv2 response */
res = Curl_ntlm_core_mk_ntlmv2_resp(ntlmv2hash, entropy, ntlm, &ntlmv2resp,
&ntresplen);
if(res)
return res;
ptr_ntresp = ntlmv2resp;
}
else
#endif
#if USE_NTLM2SESSION
/* We don't support NTLM2 if we don't have USE_NTRESPONSES */
if(ntlm->flags & NTLMFLAG_NEGOTIATE_NTLM2_KEY) {
unsigned char ntbuffer[0x18];
unsigned char tmp[0x18];
unsigned char md5sum[MD5_DIGEST_LENGTH];
unsigned char entropy[8];
/* Need to create 8 bytes random data */
Curl_ssl_random(data, entropy, sizeof(entropy));
/* 8 bytes random data as challenge in lmresp */
memcpy(lmresp, entropy, 8);
/* Pad with zeros */
memset(lmresp + 8, 0, 0x10);
/* Fill tmp with challenge(nonce?) + entropy */
memcpy(tmp, &ntlm->nonce[0], 8);
memcpy(tmp + 8, entropy, 8);
Curl_ssl_md5sum(tmp, 16, md5sum, MD5_DIGEST_LENGTH);
/* We shall only use the first 8 bytes of md5sum, but the des
code in Curl_ntlm_core_lm_resp only encrypt the first 8 bytes */
if(CURLE_OUT_OF_MEMORY ==
Curl_ntlm_core_mk_nt_hash(data, passwdp, ntbuffer))
return CURLE_OUT_OF_MEMORY;
Curl_ntlm_core_lm_resp(ntbuffer, md5sum, ntresp);
/* End of NTLM2 Session code */
}
else
#endif
{
#if USE_NTRESPONSES
unsigned char ntbuffer[0x18];
#endif
unsigned char lmbuffer[0x18];
#if USE_NTRESPONSES
if(CURLE_OUT_OF_MEMORY ==
Curl_ntlm_core_mk_nt_hash(data, passwdp, ntbuffer))
return CURLE_OUT_OF_MEMORY;
Curl_ntlm_core_lm_resp(ntbuffer, &ntlm->nonce[0], ntresp);
#endif
Curl_ntlm_core_mk_lm_hash(data, passwdp, lmbuffer);
Curl_ntlm_core_lm_resp(lmbuffer, &ntlm->nonce[0], lmresp);
/* A safer but less compatible alternative is:
* Curl_ntlm_core_lm_resp(ntbuffer, &ntlm->nonce[0], lmresp);
* See http://davenport.sourceforge.net/ntlm.html#ntlmVersion2 */
}
if(unicode) {
domlen = domlen * 2;
userlen = userlen * 2;
hostlen = hostlen * 2;
}
lmrespoff = 64; /* size of the message header */
#if USE_NTRESPONSES
ntrespoff = lmrespoff + 0x18;
domoff = ntrespoff + ntresplen;
#else
domoff = lmrespoff + 0x18;
#endif
useroff = domoff + domlen;
hostoff = useroff + userlen;
/* Create the big type-3 message binary blob */
size = snprintf((char *)ntlmbuf, NTLM_BUFSIZE,
NTLMSSP_SIGNATURE "%c"
"\x03%c%c%c" /* 32-bit type = 3 */
"%c%c" /* LanManager length */
"%c%c" /* LanManager allocated space */
"%c%c" /* LanManager offset */
"%c%c" /* 2 zeroes */
"%c%c" /* NT-response length */
"%c%c" /* NT-response allocated space */
"%c%c" /* NT-response offset */
"%c%c" /* 2 zeroes */
"%c%c" /* domain length */
"%c%c" /* domain allocated space */
"%c%c" /* domain name offset */
"%c%c" /* 2 zeroes */
"%c%c" /* user length */
"%c%c" /* user allocated space */
"%c%c" /* user offset */
"%c%c" /* 2 zeroes */
"%c%c" /* host length */
"%c%c" /* host allocated space */
"%c%c" /* host offset */
"%c%c" /* 2 zeroes */
"%c%c" /* session key length (unknown purpose) */
"%c%c" /* session key allocated space (unknown purpose) */
"%c%c" /* session key offset (unknown purpose) */
"%c%c" /* 2 zeroes */
"%c%c%c%c", /* flags */
/* domain string */
/* user string */
/* host string */
/* LanManager response */
/* NT response */
0, /* zero termination */
0, 0, 0, /* type-3 long, the 24 upper bits */
SHORTPAIR(0x18), /* LanManager response length, twice */
SHORTPAIR(0x18),
SHORTPAIR(lmrespoff),
0x0, 0x0,
#if USE_NTRESPONSES
SHORTPAIR(ntresplen), /* NT-response length, twice */
SHORTPAIR(ntresplen),
SHORTPAIR(ntrespoff),
0x0, 0x0,
#else
0x0, 0x0,
0x0, 0x0,
0x0, 0x0,
0x0, 0x0,
#endif
SHORTPAIR(domlen),
SHORTPAIR(domlen),
SHORTPAIR(domoff),
0x0, 0x0,
SHORTPAIR(userlen),
SHORTPAIR(userlen),
SHORTPAIR(useroff),
0x0, 0x0,
SHORTPAIR(hostlen),
SHORTPAIR(hostlen),
SHORTPAIR(hostoff),
0x0, 0x0,
0x0, 0x0,
0x0, 0x0,
0x0, 0x0,
0x0, 0x0,
LONGQUARTET(ntlm->flags));
DEBUGASSERT(size == 64);
DEBUGASSERT(size == (size_t)lmrespoff);
/* We append the binary hashes */
if(size < (NTLM_BUFSIZE - 0x18)) {
memcpy(&ntlmbuf[size], lmresp, 0x18);
size += 0x18;
}
DEBUG_OUT({
fprintf(stderr, "**** TYPE3 header lmresp=");
ntlm_print_hex(stderr, (char *)&ntlmbuf[lmrespoff], 0x18);
});
#if USE_NTRESPONSES
if(size < (NTLM_BUFSIZE - ntresplen)) {
DEBUGASSERT(size == (size_t)ntrespoff);
memcpy(&ntlmbuf[size], ptr_ntresp, ntresplen);
size += ntresplen;
}
DEBUG_OUT({
fprintf(stderr, "\n ntresp=");
ntlm_print_hex(stderr, (char *)&ntlmbuf[ntrespoff], ntresplen);
});
Curl_safefree(ntlmv2resp);/* Free the dynamic buffer allocated for NTLMv2 */
#endif
DEBUG_OUT({
fprintf(stderr, "\n flags=0x%02.2x%02.2x%02.2x%02.2x 0x%08.8x ",
LONGQUARTET(ntlm->flags), ntlm->flags);
ntlm_print_flags(stderr, ntlm->flags);
fprintf(stderr, "\n****\n");
});
/* Make sure that the domain, user and host strings fit in the
buffer before we copy them there. */
if(size + userlen + domlen + hostlen >= NTLM_BUFSIZE) {
failf(data, "user + domain + host name too big");
return CURLE_OUT_OF_MEMORY;
}
DEBUGASSERT(size == domoff);
if(unicode)
unicodecpy(&ntlmbuf[size], domain, domlen / 2);
else
memcpy(&ntlmbuf[size], domain, domlen);
size += domlen;
DEBUGASSERT(size == useroff);
if(unicode)
unicodecpy(&ntlmbuf[size], user, userlen / 2);
else
memcpy(&ntlmbuf[size], user, userlen);
size += userlen;
DEBUGASSERT(size == hostoff);
if(unicode)
unicodecpy(&ntlmbuf[size], host, hostlen / 2);
else
memcpy(&ntlmbuf[size], host, hostlen);
size += hostlen;
/* Convert domain, user, and host to ASCII but leave the rest as-is */
res = Curl_convert_to_network(data, (char *)&ntlmbuf[domoff],
size - domoff);
if(res)
return CURLE_CONV_FAILED;
#endif
/* Return with binary blob encoded into base64 */
return Curl_base64_encode(NULL, (char *)ntlmbuf, size, outptr, outlen);
}
#endif /* USE_NTLM */
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