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curl/lib/http_ntlm.c
Daniel Stenberg 6e61939382 GnuTLS support added. There's now a "generic" SSL layer that we use all over 
internally, with code provided by sslgen.c. All SSL-layer-specific code is
then written in ssluse.c (for OpenSSL) and gtls.c (for GnuTLS).

As far as possible, internals should not need to know what SSL layer that is
in use. Building with GnuTLS currently makes two test cases fail.

TODO.gnutls contains a few known outstanding issues for the GnuTLS support.

GnuTLS support is enabled with configure --with-gnutls
2005-04-07 15:27:13 +00:00

773 lines
21 KiB
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2005, 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.
*
* $Id$
***************************************************************************/
#include "setup.h"
/* NTLM details:
http://davenport.sourceforge.net/ntlm.html
http://www.innovation.ch/java/ntlm.html
*/
#ifndef CURL_DISABLE_HTTP
#ifdef USE_NTLM
/* -- WIN32 approved -- */
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <ctype.h>
#include "urldata.h"
#include "sendf.h"
#include "strequal.h"
#include "base64.h"
#include "http_ntlm.h"
#include "url.h"
#include "memory.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#ifndef USE_WINDOWS_SSPI
#include <openssl/des.h>
#include <openssl/md4.h>
#include <openssl/ssl.h>
#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
/* This is how things were done in the old days */
#define DESKEY(x) x
#define DESKEYARG(x) x
#else
/* Modern version */
#define DESKEYARG(x) *x
#define DESKEY(x) &x
#endif
#else
#include <rpc.h>
#endif
/* The last #include file should be: */
#include "memdebug.h"
/* Define this to make the type-3 message include the NT response message */
#define USE_NTRESPONSES 1
/*
(*) = A "security buffer" is a triplet consisting of two shorts and one
long:
1. a 'short' containing the length of the buffer 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 from the
beginning of the NTLM message, in bytes.
*/
CURLntlm Curl_input_ntlm(struct connectdata *conn,
bool proxy, /* if proxy or not */
char *header) /* rest of the www-authenticate:
header */
{
/* point to the correct struct with this */
struct ntlmdata *ntlm;
ntlm = proxy?&conn->proxyntlm:&conn->ntlm;
/* skip initial whitespaces */
while(*header && isspace((int)*header))
header++;
if(checkprefix("NTLM", header)) {
header += strlen("NTLM");
while(*header && isspace((int)*header))
header++;
if(*header) {
/* We got a type-2 message here:
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 (optional) 8 bytes (two consecutive longs)
(40) Target Information (optional) security buffer(*)
32 (48) start of data block
*/
size_t size;
unsigned char *buffer;
size = Curl_base64_decode(header, &buffer);
if(!buffer)
return CURLNTLM_BAD;
ntlm->state = NTLMSTATE_TYPE2; /* we got a type-2 */
#ifdef USE_WINDOWS_SSPI
if ((ntlm->type_2 = malloc(size+1)) == NULL) {
free(buffer);
return CURLE_OUT_OF_MEMORY;
}
ntlm->n_type_2 = size;
memcpy(ntlm->type_2, buffer, size);
#else
if(size >= 48)
/* the nonce of interest is index [24 .. 31], 8 bytes */
memcpy(ntlm->nonce, &buffer[24], 8);
/* FIX: add an else here! */
/* at index decimal 20, there's a 32bit NTLM flag field */
free(buffer);
#endif
}
else {
if(ntlm->state >= NTLMSTATE_TYPE1)
return CURLNTLM_BAD;
ntlm->state = NTLMSTATE_TYPE1; /* we should sent away a type-1 */
}
}
return CURLNTLM_FINE;
}
#ifndef USE_WINDOWS_SSPI
/*
* 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(unsigned char *key_56,
DES_key_schedule DESKEYARG(ks))
{
DES_cblock key;
key[0] = key_56[0];
key[1] = ((key_56[0] << 7) & 0xFF) | (key_56[1] >> 1);
key[2] = ((key_56[1] << 6) & 0xFF) | (key_56[2] >> 2);
key[3] = ((key_56[2] << 5) & 0xFF) | (key_56[3] >> 3);
key[4] = ((key_56[3] << 4) & 0xFF) | (key_56[4] >> 4);
key[5] = ((key_56[4] << 3) & 0xFF) | (key_56[5] >> 5);
key[6] = ((key_56[5] << 2) & 0xFF) | (key_56[6] >> 6);
key[7] = (key_56[6] << 1) & 0xFF;
DES_set_odd_parity(&key);
DES_set_key(&key, ks);
}
/*
* 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.
*/
static void calc_resp(unsigned char *keys,
unsigned char *plaintext,
unsigned char *results)
{
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);
}
/*
* Set up lanmanager and nt hashed passwords
*/
static void mkhash(char *password,
unsigned char *nonce, /* 8 bytes */
unsigned char *lmresp /* must fit 0x18 bytes */
#ifdef USE_NTRESPONSES
, unsigned char *ntresp /* must fit 0x18 bytes */
#endif
)
{
/* 21 bytes fits 3 7-bytes chunks, as we use 56 bit (7 bytes) as DES input,
and we add three different ones, see the calc_resp() function */
unsigned char lmbuffer[21];
#ifdef USE_NTRESPONSES
unsigned char ntbuffer[21];
#endif
unsigned char *pw;
static const unsigned char magic[] = {
0x4B, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25
};
unsigned int i;
size_t len = strlen(password);
/* make it fit at least 14 bytes */
pw = malloc(len<7?14:len*2);
if(!pw)
return; /* this will lead to a badly generated package */
if (len > 14)
len = 14;
for (i=0; i<len; i++)
pw[i] = toupper(password[i]);
for (; i<14; i++)
pw[i] = 0;
{
/* create LanManager hashed password */
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);
memset(lmbuffer+16, 0, sizeof(lmbuffer)-16);
}
/* create LM responses */
calc_resp(lmbuffer, nonce, lmresp);
#ifdef USE_NTRESPONSES
{
/* create NT hashed password */
MD4_CTX MD4;
len = strlen(password);
for (i=0; i<len; i++) {
pw[2*i] = password[i];
pw[2*i+1] = 0;
}
MD4_Init(&MD4);
MD4_Update(&MD4, pw, 2*len);
MD4_Final(ntbuffer, &MD4);
memset(ntbuffer+16, 0, sizeof(ntbuffer)-16);
}
calc_resp(ntbuffer, nonce, ntresp);
#endif
free(pw);
}
#endif
#ifdef USE_WINDOWS_SSPI
static void
ntlm_sspi_cleanup(struct ntlmdata *ntlm)
{
if (ntlm->type_2) {
free(ntlm->type_2);
ntlm->type_2 = NULL;
}
if (ntlm->has_handles) {
DeleteSecurityContext(&ntlm->c_handle);
FreeCredentialsHandle(&ntlm->handle);
ntlm->has_handles = 0;
}
if (ntlm->p_identity) {
if (ntlm->identity.User) free(ntlm->identity.User);
if (ntlm->identity.Password) free(ntlm->identity.Password);
if (ntlm->identity.Domain) free(ntlm->identity.Domain);
ntlm->p_identity = NULL;
}
}
#endif
#define SHORTPAIR(x) ((x) & 0xff), ((x) >> 8)
#define LONGQUARTET(x) ((x) & 0xff), (((x) >> 8)&0xff), \
(((x) >>16)&0xff), ((x)>>24)
/* this is for creating ntlm header output */
CURLcode Curl_output_ntlm(struct connectdata *conn,
bool proxy)
{
const char *domain=""; /* empty */
const char *host=""; /* empty */
#ifndef USE_WINDOWS_SSPI
int domlen=(int)strlen(domain);
int hostlen = (int)strlen(host);
int hostoff; /* host name offset */
int domoff; /* domain name offset */
#endif
size_t size;
char *base64=NULL;
unsigned char ntlmbuf[256]; /* enough, unless the host/domain is very long */
/* point to the address of the pointer that holds the string to sent to the
server, which is for a plain host or for a HTTP proxy */
char **allocuserpwd;
/* point to the name and password for this */
char *userp;
char *passwdp;
/* point to the correct struct with this */
struct ntlmdata *ntlm;
struct auth *authp;
curlassert(conn);
curlassert(conn->data);
if(proxy) {
allocuserpwd = &conn->allocptr.proxyuserpwd;
userp = conn->proxyuser;
passwdp = conn->proxypasswd;
ntlm = &conn->proxyntlm;
authp = &conn->data->state.authproxy;
}
else {
allocuserpwd = &conn->allocptr.userpwd;
userp = conn->user;
passwdp = conn->passwd;
ntlm = &conn->ntlm;
authp = &conn->data->state.authhost;
}
authp->done = FALSE;
/* not set means empty */
if(!userp)
userp=(char *)"";
if(!passwdp)
passwdp=(char *)"";
switch(ntlm->state) {
case NTLMSTATE_TYPE1:
default: /* for the weird cases we (re)start here */
#ifdef USE_WINDOWS_SSPI
{
SecBuffer buf;
SecBufferDesc desc;
SECURITY_STATUS status;
ULONG attrs;
const char *user;
int domlen;
ntlm_sspi_cleanup(ntlm);
user = strchr(userp, '\\');
if (!user)
user = strchr(userp, '/');
if (user) {
domain = userp;
domlen = user - userp;
user++;
}
else {
user = userp;
domain = "";
domlen = 0;
}
if (user && *user) {
/* note: initialize all of this before doing the mallocs so that
* it can be cleaned up later without leaking memory.
*/
ntlm->p_identity = &ntlm->identity;
memset(ntlm->p_identity, 0, sizeof(*ntlm->p_identity));
if ((ntlm->identity.User = (unsigned char *)strdup(user)) == NULL)
return CURLE_OUT_OF_MEMORY;
ntlm->identity.UserLength = strlen(user);
if ((ntlm->identity.Password = (unsigned char *)strdup(passwdp)) == NULL)
return CURLE_OUT_OF_MEMORY;
ntlm->identity.PasswordLength = strlen(passwdp);
if ((ntlm->identity.Domain = malloc(domlen+1)) == NULL)
return CURLE_OUT_OF_MEMORY;
strncpy((char *)ntlm->identity.Domain, domain, domlen);
ntlm->identity.Domain[domlen] = '\0';
ntlm->identity.DomainLength = domlen;
ntlm->identity.Flags = SEC_WINNT_AUTH_IDENTITY_ANSI;
}
else {
ntlm->p_identity = NULL;
}
if (AcquireCredentialsHandle(
NULL, (char *)"NTLM", SECPKG_CRED_OUTBOUND, NULL, ntlm->p_identity,
NULL, NULL, &ntlm->handle, NULL
) != SEC_E_OK) {
return CURLE_OUT_OF_MEMORY;
}
desc.ulVersion = SECBUFFER_VERSION;
desc.cBuffers = 1;
desc.pBuffers = &buf;
buf.cbBuffer = sizeof(ntlmbuf);
buf.BufferType = SECBUFFER_TOKEN;
buf.pvBuffer = ntlmbuf;
status = InitializeSecurityContext(&ntlm->handle, NULL, (char *) host,
ISC_REQ_CONFIDENTIALITY |
ISC_REQ_REPLAY_DETECT |
ISC_REQ_CONNECTION,
0, SECURITY_NETWORK_DREP, NULL, 0,
&ntlm->c_handle, &desc, &attrs, NULL
);
if (status == SEC_I_COMPLETE_AND_CONTINUE ||
status == SEC_I_CONTINUE_NEEDED) {
CompleteAuthToken(&ntlm->c_handle, &desc);
}
else if (status != SEC_E_OK) {
FreeCredentialsHandle(&ntlm->handle);
return CURLE_RECV_ERROR;
}
ntlm->has_handles = 1;
size = buf.cbBuffer;
}
#else
hostoff = 32;
domoff = hostoff + hostlen;
/* Create and send a type-1 message:
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 start of data block
*/
snprintf((char *)ntlmbuf, sizeof(ntlmbuf), "NTLMSSP%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| /* 2 */
NTLMFLAG_NEGOTIATE_NTLM_KEY /* 200 */
/* equals 0x0202 */
),
SHORTPAIR(domlen),
SHORTPAIR(domlen),
SHORTPAIR(domoff),
0,0,
SHORTPAIR(hostlen),
SHORTPAIR(hostlen),
SHORTPAIR(hostoff),
0,0,
host, domain);
/* initial packet length */
size = 32 + hostlen + domlen;
#endif
/* now keeper of the base64 encoded package size */
size = Curl_base64_encode((char *)ntlmbuf, size, &base64);
if(size >0 ) {
Curl_safefree(*allocuserpwd);
*allocuserpwd = aprintf("%sAuthorization: NTLM %s\r\n",
proxy?"Proxy-":"",
base64);
free(base64);
}
else
return CURLE_OUT_OF_MEMORY; /* FIX TODO */
break;
case NTLMSTATE_TYPE2:
/* We received the type-2 already, create a type-3 message:
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 Domain Name security buffer(*)
36 User Name security buffer(*)
44 Workstation Name security buffer(*)
(52) Session Key (optional) security buffer(*)
(60) Flags (optional) long
52 (64) start of data block
*/
{
#ifdef USE_WINDOWS_SSPI
SecBuffer type_2, type_3;
SecBufferDesc type_2_desc, type_3_desc;
SECURITY_STATUS status;
ULONG attrs;
type_2_desc.ulVersion = type_3_desc.ulVersion = SECBUFFER_VERSION;
type_2_desc.cBuffers = type_3_desc.cBuffers = 1;
type_2_desc.pBuffers = &type_2;
type_3_desc.pBuffers = &type_3;
type_2.BufferType = SECBUFFER_TOKEN;
type_2.pvBuffer = ntlm->type_2;
type_2.cbBuffer = ntlm->n_type_2;
type_3.BufferType = SECBUFFER_TOKEN;
type_3.pvBuffer = ntlmbuf;
type_3.cbBuffer = sizeof(ntlmbuf);
status = InitializeSecurityContext(&ntlm->handle, &ntlm->c_handle,
(char *) host,
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, NULL);
if (status != SEC_E_OK)
return CURLE_RECV_ERROR;
size = type_3.cbBuffer;
ntlm_sspi_cleanup(ntlm);
#else
int lmrespoff;
int ntrespoff;
int useroff;
unsigned char lmresp[0x18]; /* fixed-size */
#ifdef USE_NTRESPONSES
unsigned char ntresp[0x18]; /* fixed-size */
#endif
const char *user;
int userlen;
user = strchr(userp, '\\');
if(!user)
user = strchr(userp, '/');
if (user) {
domain = userp;
domlen = (int)(user - domain);
user++;
}
else
user = userp;
userlen = (int)strlen(user);
mkhash(passwdp, &ntlm->nonce[0], lmresp
#ifdef USE_NTRESPONSES
, ntresp
#endif
);
domoff = 64; /* always */
useroff = domoff + domlen;
hostoff = useroff + userlen;
lmrespoff = hostoff + hostlen;
ntrespoff = lmrespoff + 0x18;
/* Create the big type-3 message binary blob */
size = snprintf((char *)ntlmbuf, sizeof(ntlmbuf),
"NTLMSSP%c"
"\x03%c%c%c" /* type-3, 32 bits */
"%c%c%c%c" /* LanManager length + 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%c%c%c%c" /* 6 zeroes */
"\xff\xff" /* message length */
"%c%c" /* 2 zeroes */
"\x01\x82" /* flags */
"%c%c" /* 2 zeroes */
/* 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,
#ifdef USE_NTRESPONSES
SHORTPAIR(0x18), /* NT-response length, twice */
SHORTPAIR(0x18),
#else
0x0, 0x0,
0x0, 0x0,
#endif
SHORTPAIR(ntrespoff),
0x0, 0x0,
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);
/* size is now 64 */
size=64;
ntlmbuf[62]=ntlmbuf[63]=0;
memcpy(&ntlmbuf[size], domain, domlen);
size += domlen;
memcpy(&ntlmbuf[size], user, userlen);
size += userlen;
/* we append the binary hashes to the end of the blob */
if(size < ((int)sizeof(ntlmbuf) - 0x18)) {
memcpy(&ntlmbuf[size], lmresp, 0x18);
size += 0x18;
}
#ifdef USE_NTRESPONSES
if(size < ((int)sizeof(ntlmbuf) - 0x18)) {
memcpy(&ntlmbuf[size], ntresp, 0x18);
size += 0x18;
}
#endif
ntlmbuf[56] = (unsigned char)(size & 0xff);
ntlmbuf[57] = (unsigned char)(size >> 8);
#endif
/* convert the binary blob into base64 */
size = Curl_base64_encode((char *)ntlmbuf, size, &base64);
if(size >0 ) {
Curl_safefree(*allocuserpwd);
*allocuserpwd = aprintf("%sAuthorization: NTLM %s\r\n",
proxy?"Proxy-":"",
base64);
free(base64);
}
else
return CURLE_OUT_OF_MEMORY; /* FIX TODO */
ntlm->state = NTLMSTATE_TYPE3; /* we sent a type-3 */
authp->done = TRUE;
}
break;
case NTLMSTATE_TYPE3:
/* connection is already authenticated,
* don't send a header in future requests */
if(*allocuserpwd) {
free(*allocuserpwd);
*allocuserpwd=NULL;
}
authp->done = TRUE;
break;
}
return CURLE_OK;
}
void
Curl_ntlm_cleanup(struct connectdata *conn)
{
#ifdef USE_WINDOWS_SSPI
ntlm_sspi_cleanup(&conn->ntlm);
ntlm_sspi_cleanup(&conn->proxyntlm);
#else
(void)conn;
#endif
}
#endif /* USE_NTLM */
#endif /* !CURL_DISABLE_HTTP */
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