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cc62c1a4aed3090bc75802327173a4ed66bcfc43
heimdal/lib/ntlm/ntlm.c
Nicolas Williams b4cf4de807 Fix warnings (clang 3.6)
2016-02-26 01:04:31 -06:00

2016 lines
49 KiB
C
Raw Blame History

/*
* Copyright (c) 2006 - 2008 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Portions Copyright (c) 2010 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <roken.h>
#include <wind.h>
#include <parse_units.h>
#include <krb5.h>
#define HC_DEPRECATED_CRYPTO
#include "krb5-types.h"
#include "crypto-headers.h"
#include <heimntlm.h>
/*! \mainpage Heimdal NTLM library
*
* \section intro Introduction
*
* Heimdal libheimntlm library is a implementation of the NTLM
* protocol, both version 1 and 2. The GSS-API mech that uses this
* library adds support for transport encryption and integrity
* checking.
*
* NTLM is a protocol for mutual authentication, its still used in
* many protocol where Kerberos is not support, one example is
* EAP/X802.1x mechanism LEAP from Microsoft and Cisco.
*
* This is a support library for the core protocol, its used in
* Heimdal to implement and GSS-API mechanism. There is also support
* in the KDC to do remote digest authenticiation, this to allow
* services to authenticate users w/o direct access to the users ntlm
* hashes (same as Kerberos arcfour enctype keys).
*
* More information about the NTLM protocol can found here
* http://davenport.sourceforge.net/ntlm.html .
*
* The Heimdal projects web page: http://www.h5l.org/
*
* @section ntlm_example NTLM Example
*
* Example to to use @ref test_ntlm.c .
*
* @example test_ntlm.c
*
* Example how to use the NTLM primitives.
*
*/
/** @defgroup ntlm_core Heimdal NTLM library
*
* The NTLM core functions implement the string2key generation
* function, message encode and decode function, and the hash function
* functions.
*/
struct sec_buffer {
uint16_t length;
uint16_t allocated;
uint32_t offset;
};
static const unsigned char ntlmsigature[8] = "NTLMSSP\x00";
time_t heim_ntlm_time_skew = 300;
/*
*
*/
#define CHECK(f, e) \
do { \
ret = f; \
if (ret != (ssize_t)(e)) { \
ret = HNTLM_ERR_DECODE; \
goto out; \
} \
} while(/*CONSTCOND*/0)
#define CHECK_SIZE(f, e) \
do { \
ssize_t sret = f; \
if (sret != (ssize_t)(e)) { \
ret = HNTLM_ERR_DECODE; \
goto out; \
} \
} while(/*CONSTCOND*/0)
#define CHECK_OFFSET(f, e) \
do { \
off_t sret = f; \
if (sret != (e)) { \
ret = HNTLM_ERR_DECODE; \
goto out; \
} \
} while(/*CONSTCOND*/0)
static struct units ntlm_flag_units[] = {
#define ntlm_flag(x) { #x, NTLM_##x }
ntlm_flag(ENC_56),
ntlm_flag(NEG_KEYEX),
ntlm_flag(ENC_128),
ntlm_flag(MBZ1),
ntlm_flag(MBZ2),
ntlm_flag(MBZ3),
ntlm_flag(NEG_VERSION),
ntlm_flag(MBZ4),
ntlm_flag(NEG_TARGET_INFO),
ntlm_flag(NON_NT_SESSION_KEY),
ntlm_flag(MBZ5),
ntlm_flag(NEG_IDENTIFY),
ntlm_flag(NEG_NTLM2),
ntlm_flag(TARGET_SHARE),
ntlm_flag(TARGET_SERVER),
ntlm_flag(TARGET_DOMAIN),
ntlm_flag(NEG_ALWAYS_SIGN),
ntlm_flag(MBZ6),
ntlm_flag(OEM_SUPPLIED_WORKSTATION),
ntlm_flag(OEM_SUPPLIED_DOMAIN),
ntlm_flag(NEG_ANONYMOUS),
ntlm_flag(NEG_NT_ONLY),
ntlm_flag(NEG_NTLM),
ntlm_flag(MBZ8),
ntlm_flag(NEG_LM_KEY),
ntlm_flag(NEG_DATAGRAM),
ntlm_flag(NEG_SEAL),
ntlm_flag(NEG_SIGN),
ntlm_flag(MBZ9),
ntlm_flag(NEG_TARGET),
ntlm_flag(NEG_OEM),
ntlm_flag(NEG_UNICODE),
#undef ntlm_flag
{NULL, 0}
};
size_t
heim_ntlm_unparse_flags(uint32_t flags, char *s, size_t len)
{
return unparse_flags(flags, ntlm_flag_units, s, len);
}
/**
* heim_ntlm_free_buf frees the ntlm buffer
*
* @param p buffer to be freed
*
* @ingroup ntlm_core
*/
void
heim_ntlm_free_buf(struct ntlm_buf *p)
{
if (p->data)
free(p->data);
p->data = NULL;
p->length = 0;
}
static int
ascii2ucs2le(const char *string, int up, struct ntlm_buf *buf)
{
uint16_t *data;
size_t len, n;
uint8_t *p;
int ret;
ret = wind_utf8ucs2_length(string, &len);
if (ret)
return ret;
if (len > UINT_MAX / sizeof(data[0]))
return ERANGE;
data = malloc(len * sizeof(data[0]));
if (data == NULL)
return ENOMEM;
ret = wind_utf8ucs2(string, data, &len);
if (ret) {
free(data);
return ret;
}
if (len == 0) {
free(data);
buf->data = NULL;
buf->length = 0;
return 0;
}
/* uppercase string, only handle ascii right now */
if (up) {
for (n = 0; n < len ; n++) {
if (data[n] < 128)
data[n] = toupper((int)data[n]);
}
}
buf->length = len * 2;
p = buf->data = malloc(buf->length);
if (buf->data == NULL && len != 0) {
free(data);
heim_ntlm_free_buf(buf);
return ENOMEM;
}
for (n = 0; n < len ; n++) {
p[(n * 2) + 0] = (data[n] ) & 0xff;
p[(n * 2) + 1] = (data[n] >> 8) & 0xff;
}
memset(data, 0, sizeof(data[0]) * len);
free(data);
return 0;
}
/*
* Sizes in bytes
*/
#define SIZE_SEC_BUFFER (2+2+4)
#define SIZE_OS_VERSION (8)
/*
*
*/
static krb5_error_code
ret_sec_buffer(krb5_storage *sp, struct sec_buffer *buf)
{
krb5_error_code ret;
CHECK(krb5_ret_uint16(sp, &buf->length), 0);
CHECK(krb5_ret_uint16(sp, &buf->allocated), 0);
CHECK(krb5_ret_uint32(sp, &buf->offset), 0);
out:
return ret;
}
static krb5_error_code
store_sec_buffer(krb5_storage *sp, const struct sec_buffer *buf)
{
krb5_error_code ret;
CHECK(krb5_store_uint16(sp, buf->length), 0);
CHECK(krb5_store_uint16(sp, buf->allocated), 0);
CHECK(krb5_store_uint32(sp, buf->offset), 0);
out:
return ret;
}
/*
* Strings are either OEM or UNICODE. The later is encoded as ucs2 on
* wire, but using utf8 in memory.
*/
static size_t
len_string(int ucs2, const char *s)
{
if (ucs2) {
size_t len;
int ret;
ret = wind_utf8ucs2_length(s, &len);
if (ret == 0)
return len * 2;
return strlen(s) * 5 * 2;
} else {
return strlen(s);
}
}
/*
*
*/
static krb5_error_code
ret_string(krb5_storage *sp, int ucs2, size_t len, char **s)
{
krb5_error_code ret;
uint16_t *data = NULL;
*s = malloc(len + 1);
if (*s == NULL)
return ENOMEM;
CHECK_SIZE(krb5_storage_read(sp, *s, len), len);
(*s)[len] = '\0';
if (ucs2) {
unsigned int flags = WIND_RW_LE;
size_t utf16len = len / 2;
size_t utf8len;
data = malloc(utf16len * sizeof(data[0]));
if (data == NULL) {
free(*s); *s = NULL;
ret = ENOMEM;
goto out;
}
ret = wind_ucs2read(*s, len, &flags, data, &utf16len);
free(*s); *s = NULL;
if (ret) {
goto out;
}
CHECK(wind_ucs2utf8_length(data, utf16len, &utf8len), 0);
utf8len += 1;
*s = malloc(utf8len);
if (s == NULL) {
ret = ENOMEM;
goto out;
}
CHECK(wind_ucs2utf8(data, utf16len, *s, &utf8len), 0);
}
ret = 0;
out:
if (data)
free(data);
return ret;
}
static krb5_error_code
ret_sec_string(krb5_storage *sp, int ucs2, struct sec_buffer *desc, char **s)
{
krb5_error_code ret = 0;
CHECK_OFFSET(krb5_storage_seek(sp, desc->offset, SEEK_SET), desc->offset);
CHECK(ret_string(sp, ucs2, desc->length, s), 0);
out:
return ret;
}
static krb5_error_code
put_string(krb5_storage *sp, int ucs2, const char *s)
{
krb5_error_code ret;
struct ntlm_buf buf;
if (ucs2) {
ret = ascii2ucs2le(s, 0, &buf);
if (ret)
return ret;
} else {
buf.data = rk_UNCONST(s);
buf.length = strlen(s);
}
CHECK_SIZE(krb5_storage_write(sp, buf.data, buf.length), buf.length);
if (ucs2)
heim_ntlm_free_buf(&buf);
ret = 0;
out:
return ret;
}
/*
*
*/
static krb5_error_code
ret_buf(krb5_storage *sp, struct sec_buffer *desc, struct ntlm_buf *buf)
{
krb5_error_code ret;
buf->data = malloc(desc->length);
buf->length = desc->length;
CHECK_OFFSET(krb5_storage_seek(sp, desc->offset, SEEK_SET), desc->offset);
CHECK_SIZE(krb5_storage_read(sp, buf->data, buf->length), buf->length);
ret = 0;
out:
return ret;
}
static krb5_error_code
put_buf(krb5_storage *sp, const struct ntlm_buf *buf)
{
krb5_error_code ret;
CHECK_SIZE(krb5_storage_write(sp, buf->data, buf->length), buf->length);
ret = 0;
out:
return ret;
}
/**
* Frees the ntlm_targetinfo message
*
* @param ti targetinfo to be freed
*
* @ingroup ntlm_core
*/
void
heim_ntlm_free_targetinfo(struct ntlm_targetinfo *ti)
{
free(ti->servername);
free(ti->domainname);
free(ti->dnsdomainname);
free(ti->dnsservername);
free(ti->dnstreename);
free(ti->targetname);
heim_ntlm_free_buf(&ti->channel_bindings);
memset(ti, 0, sizeof(*ti));
}
static int
encode_ti_string(krb5_storage *out, uint16_t type, int ucs2, char *s)
{
krb5_error_code ret;
CHECK(krb5_store_uint16(out, type), 0);
CHECK(krb5_store_uint16(out, len_string(ucs2, s)), 0);
CHECK(put_string(out, ucs2, s), 0);
out:
return ret;
}
/**
* Encodes a ntlm_targetinfo message.
*
* @param ti the ntlm_targetinfo message to encode.
* @param ucs2 ignored
* @param data is the return buffer with the encoded message, should be
* freed with heim_ntlm_free_buf().
*
* @return In case of success 0 is return, an errors, a errno in what
* went wrong.
*
* @ingroup ntlm_core
*/
int
heim_ntlm_encode_targetinfo(const struct ntlm_targetinfo *ti,
int ucs2,
struct ntlm_buf *data)
{
krb5_error_code ret;
krb5_storage *out;
data->data = NULL;
data->length = 0;
out = krb5_storage_emem();
if (out == NULL)
return ENOMEM;
krb5_storage_set_byteorder(out, KRB5_STORAGE_BYTEORDER_LE);
if (ti->servername)
CHECK(encode_ti_string(out, 1, ucs2, ti->servername), 0);
if (ti->domainname)
CHECK(encode_ti_string(out, 2, ucs2, ti->domainname), 0);
if (ti->dnsservername)
CHECK(encode_ti_string(out, 3, ucs2, ti->dnsservername), 0);
if (ti->dnsdomainname)
CHECK(encode_ti_string(out, 4, ucs2, ti->dnsdomainname), 0);
if (ti->dnstreename)
CHECK(encode_ti_string(out, 5, ucs2, ti->dnstreename), 0);
if (ti->avflags) {
CHECK(krb5_store_uint16(out, 6), 0);
CHECK(krb5_store_uint16(out, 4), 0);
CHECK(krb5_store_uint32(out, ti->avflags), 0);
}
if (ti->timestamp) {
CHECK(krb5_store_uint16(out, 7), 0);
CHECK(krb5_store_uint16(out, 8), 0);
CHECK(krb5_store_uint32(out, ti->timestamp & 0xffffffff), 0);
CHECK(krb5_store_uint32(out, (ti->timestamp >> 32) & 0xffffffff), 0);
}
if (ti->targetname) {
CHECK(encode_ti_string(out, 9, ucs2, ti->targetname), 0);
}
if (ti->channel_bindings.length) {
CHECK(krb5_store_uint16(out, 10), 0);
CHECK(krb5_store_uint16(out, ti->channel_bindings.length), 0);
CHECK_SIZE(krb5_storage_write(out, ti->channel_bindings.data, ti->channel_bindings.length), ti->channel_bindings.length);
}
/* end tag */
CHECK(krb5_store_int16(out, 0), 0);
CHECK(krb5_store_int16(out, 0), 0);
{
krb5_data d;
ret = krb5_storage_to_data(out, &d);
data->data = d.data;
data->length = d.length;
}
out:
krb5_storage_free(out);
return ret;
}
/**
* Decodes an NTLM targetinfo message
*
* @param data input data buffer with the encode NTLM targetinfo message
* @param ucs2 if the strings should be encoded with ucs2 (selected by flag in message).
* @param ti the decoded target info, should be freed with heim_ntlm_free_targetinfo().
*
* @return In case of success 0 is return, an errors, a errno in what
* went wrong.
*
* @ingroup ntlm_core
*/
int
heim_ntlm_decode_targetinfo(const struct ntlm_buf *data,
int ucs2,
struct ntlm_targetinfo *ti)
{
uint16_t type, len;
krb5_storage *in;
int ret = 0, done = 0;
memset(ti, 0, sizeof(*ti));
if (data->length == 0)
return 0;
in = krb5_storage_from_readonly_mem(data->data, data->length);
if (in == NULL)
return ENOMEM;
krb5_storage_set_byteorder(in, KRB5_STORAGE_BYTEORDER_LE);
while (!done) {
CHECK(krb5_ret_uint16(in, &type), 0);
CHECK(krb5_ret_uint16(in, &len), 0);
switch (type) {
case 0:
done = 1;
break;
case 1:
CHECK(ret_string(in, ucs2, len, &ti->servername), 0);
break;
case 2:
CHECK(ret_string(in, ucs2, len, &ti->domainname), 0);
break;
case 3:
CHECK(ret_string(in, ucs2, len, &ti->dnsservername), 0);
break;
case 4:
CHECK(ret_string(in, ucs2, len, &ti->dnsdomainname), 0);
break;
case 5:
CHECK(ret_string(in, ucs2, len, &ti->dnstreename), 0);
break;
case 6:
CHECK(krb5_ret_uint32(in, &ti->avflags), 0);
break;
case 7: {
uint32_t tmp;
CHECK(krb5_ret_uint32(in, &tmp), 0);
ti->timestamp = tmp;
CHECK(krb5_ret_uint32(in, &tmp), 0);
ti->timestamp |= ((uint64_t)tmp) << 32;
break;
}
case 9:
CHECK(ret_string(in, 1, len, &ti->targetname), 0);
break;
case 10:
ti->channel_bindings.data = malloc(len);
if (ti->channel_bindings.data == NULL) {
ret = ENOMEM;
goto out;
}
ti->channel_bindings.length = len;
CHECK_SIZE(krb5_storage_read(in, ti->channel_bindings.data, len), len);
break;
default:
krb5_storage_seek(in, len, SEEK_CUR);
break;
}
}
out:
if (in)
krb5_storage_free(in);
return ret;
}
static krb5_error_code
encode_os_version(krb5_storage *out)
{
krb5_error_code ret;
CHECK(krb5_store_uint8(out, 0x06), 0);
CHECK(krb5_store_uint8(out, 0x01), 0);
CHECK(krb5_store_uint16(out, 0x1db0), 0);
CHECK(krb5_store_uint8(out, 0x0f), 0); /* ntlm version 15 */
CHECK(krb5_store_uint8(out, 0x00), 0);
CHECK(krb5_store_uint8(out, 0x00), 0);
CHECK(krb5_store_uint8(out, 0x00), 0);
out:
return ret;
}
/**
* Frees the ntlm_type1 message
*
* @param data message to be freed
*
* @ingroup ntlm_core
*/
void
heim_ntlm_free_type1(struct ntlm_type1 *data)
{
if (data->domain)
free(data->domain);
if (data->hostname)
free(data->hostname);
memset(data, 0, sizeof(*data));
}
int
heim_ntlm_decode_type1(const struct ntlm_buf *buf, struct ntlm_type1 *data)
{
krb5_error_code ret;
unsigned char sig[8];
uint32_t type;
struct sec_buffer domain, hostname;
krb5_storage *in;
int ucs2;
memset(data, 0, sizeof(*data));
in = krb5_storage_from_readonly_mem(buf->data, buf->length);
if (in == NULL) {
ret = ENOMEM;
goto out;
}
krb5_storage_set_byteorder(in, KRB5_STORAGE_BYTEORDER_LE);
CHECK_SIZE(krb5_storage_read(in, sig, sizeof(sig)), sizeof(sig));
CHECK(memcmp(ntlmsigature, sig, sizeof(ntlmsigature)), 0);
CHECK(krb5_ret_uint32(in, &type), 0);
CHECK(type, 1);
CHECK(krb5_ret_uint32(in, &data->flags), 0);
ucs2 = !!(data->flags & NTLM_NEG_UNICODE);
/*
* domain and hostname are unconditionally encoded regardless of
* NTLMSSP_NEGOTIATE_OEM_{HOSTNAME,WORKSTATION}_SUPPLIED flag
*/
CHECK(ret_sec_buffer(in, &domain), 0);
CHECK(ret_sec_buffer(in, &hostname), 0);
if (data->flags & NTLM_NEG_VERSION) {
CHECK(krb5_ret_uint32(in, &data->os[0]), 0);
CHECK(krb5_ret_uint32(in, &data->os[1]), 0);
}
if (data->flags & NTLM_OEM_SUPPLIED_DOMAIN)
CHECK(ret_sec_string(in, ucs2, &domain, &data->domain), 0);
if (data->flags & NTLM_OEM_SUPPLIED_WORKSTATION)
CHECK(ret_sec_string(in, ucs2, &hostname, &data->hostname), 0);
out:
if (in)
krb5_storage_free(in);
if (ret)
heim_ntlm_free_type1(data);
return ret;
}
/**
* Encodes an ntlm_type1 message.
*
* @param type1 the ntlm_type1 message to encode.
* @param data is the return buffer with the encoded message, should be
* freed with heim_ntlm_free_buf().
*
* @return In case of success 0 is return, an errors, a errno in what
* went wrong.
*
* @ingroup ntlm_core
*/
int
heim_ntlm_encode_type1(const struct ntlm_type1 *type1, struct ntlm_buf *data)
{
krb5_error_code ret;
struct sec_buffer domain, hostname;
krb5_storage *out;
uint32_t base, flags;
int ucs2 = 0;
flags = type1->flags;
base = 16;
if (flags & NTLM_NEG_UNICODE)
ucs2 = 1;
if (type1->domain) {
base += SIZE_SEC_BUFFER;
flags |= NTLM_OEM_SUPPLIED_DOMAIN;
}
if (type1->hostname) {
base += SIZE_SEC_BUFFER;
flags |= NTLM_OEM_SUPPLIED_WORKSTATION;
}
if (flags & NTLM_NEG_VERSION)
base += SIZE_OS_VERSION; /* os */
if (type1->domain) {
domain.offset = base;
domain.length = len_string(ucs2, type1->domain);
domain.allocated = domain.length;
} else {
domain.offset = 0;
domain.length = 0;
domain.allocated = 0;
}
if (type1->hostname) {
hostname.offset = domain.allocated + domain.offset;
hostname.length = len_string(ucs2, type1->hostname);
hostname.allocated = hostname.length;
} else {
hostname.offset = 0;
hostname.length = 0;
hostname.allocated = 0;
}
out = krb5_storage_emem();
if (out == NULL)
return ENOMEM;
krb5_storage_set_byteorder(out, KRB5_STORAGE_BYTEORDER_LE);
CHECK_SIZE(krb5_storage_write(out, ntlmsigature, sizeof(ntlmsigature)),
sizeof(ntlmsigature));
CHECK(krb5_store_uint32(out, 1), 0);
CHECK(krb5_store_uint32(out, flags), 0);
CHECK(store_sec_buffer(out, &domain), 0);
CHECK(store_sec_buffer(out, &hostname), 0);
if (flags & NTLM_NEG_VERSION) {
CHECK(encode_os_version(out), 0);
}
if (type1->domain)
CHECK(put_string(out, ucs2, type1->domain), 0);
if (type1->hostname)
CHECK(put_string(out, ucs2, type1->hostname), 0);
{
krb5_data d;
ret = krb5_storage_to_data(out, &d);
data->data = d.data;
data->length = d.length;
}
out:
krb5_storage_free(out);
return ret;
}
/**
* Frees the ntlm_type2 message
*
* @param data message to be freed
*
* @ingroup ntlm_core
*/
void
heim_ntlm_free_type2(struct ntlm_type2 *data)
{
if (data->targetname)
free(data->targetname);
heim_ntlm_free_buf(&data->targetinfo);
memset(data, 0, sizeof(*data));
}
int
heim_ntlm_decode_type2(const struct ntlm_buf *buf, struct ntlm_type2 *type2)
{
krb5_error_code ret;
unsigned char sig[8];
uint32_t type, ctx[2];
struct sec_buffer targetname, targetinfo;
krb5_storage *in;
int ucs2 = 0;
memset(type2, 0, sizeof(*type2));
in = krb5_storage_from_readonly_mem(buf->data, buf->length);
if (in == NULL) {
ret = ENOMEM;
goto out;
}
krb5_storage_set_byteorder(in, KRB5_STORAGE_BYTEORDER_LE);
CHECK_SIZE(krb5_storage_read(in, sig, sizeof(sig)), sizeof(sig));
CHECK(memcmp(ntlmsigature, sig, sizeof(ntlmsigature)), 0);
CHECK(krb5_ret_uint32(in, &type), 0);
CHECK(type, 2);
CHECK(ret_sec_buffer(in, &targetname), 0);
CHECK(krb5_ret_uint32(in, &type2->flags), 0);
if (type2->flags & NTLM_NEG_UNICODE)
ucs2 = 1;
CHECK_SIZE(krb5_storage_read(in, type2->challenge, sizeof(type2->challenge)),
sizeof(type2->challenge));
CHECK(krb5_ret_uint32(in, &ctx[0]), 0); /* context */
CHECK(krb5_ret_uint32(in, &ctx[1]), 0);
CHECK(ret_sec_buffer(in, &targetinfo), 0);
/* os version */
if (type2->flags & NTLM_NEG_VERSION) {
CHECK(krb5_ret_uint32(in, &type2->os[0]), 0);
CHECK(krb5_ret_uint32(in, &type2->os[1]), 0);
}
CHECK(ret_sec_string(in, ucs2, &targetname, &type2->targetname), 0);
CHECK(ret_buf(in, &targetinfo, &type2->targetinfo), 0);
ret = 0;
out:
if (in)
krb5_storage_free(in);
if (ret)
heim_ntlm_free_type2(type2);
return ret;
}
/**
* Encodes an ntlm_type2 message.
*
* @param type2 the ntlm_type2 message to encode.
* @param data is the return buffer with the encoded message, should be
* freed with heim_ntlm_free_buf().
*
* @return In case of success 0 is return, an errors, a errno in what
* went wrong.
*
* @ingroup ntlm_core
*/
int
heim_ntlm_encode_type2(const struct ntlm_type2 *type2, struct ntlm_buf *data)
{
struct sec_buffer targetname, targetinfo;
krb5_error_code ret;
krb5_storage *out = NULL;
uint32_t base;
int ucs2 = 0;
base = 48;
if (type2->flags & NTLM_NEG_VERSION)
base += SIZE_OS_VERSION;
if (type2->flags & NTLM_NEG_UNICODE)
ucs2 = 1;
targetname.offset = base;
targetname.length = len_string(ucs2, type2->targetname);
targetname.allocated = targetname.length;
targetinfo.offset = targetname.allocated + targetname.offset;
targetinfo.length = type2->targetinfo.length;
targetinfo.allocated = type2->targetinfo.length;
out = krb5_storage_emem();
if (out == NULL)
return ENOMEM;
krb5_storage_set_byteorder(out, KRB5_STORAGE_BYTEORDER_LE);
CHECK_SIZE(krb5_storage_write(out, ntlmsigature, sizeof(ntlmsigature)),
sizeof(ntlmsigature));
CHECK(krb5_store_uint32(out, 2), 0);
CHECK(store_sec_buffer(out, &targetname), 0);
CHECK(krb5_store_uint32(out, type2->flags), 0);
CHECK_SIZE(krb5_storage_write(out, type2->challenge, sizeof(type2->challenge)),
sizeof(type2->challenge));
CHECK(krb5_store_uint32(out, 0), 0); /* context */
CHECK(krb5_store_uint32(out, 0), 0);
CHECK(store_sec_buffer(out, &targetinfo), 0);
/* os version */
if (type2->flags & NTLM_NEG_VERSION) {
CHECK(encode_os_version(out), 0);
}
CHECK(put_string(out, ucs2, type2->targetname), 0);
CHECK_SIZE(krb5_storage_write(out, type2->targetinfo.data,
type2->targetinfo.length),
type2->targetinfo.length);
{
krb5_data d;
ret = krb5_storage_to_data(out, &d);
data->data = d.data;
data->length = d.length;
}
out:
krb5_storage_free(out);
return ret;
}
/**
* Frees the ntlm_type3 message
*
* @param data message to be freed
*
* @ingroup ntlm_core
*/
void
heim_ntlm_free_type3(struct ntlm_type3 *data)
{
heim_ntlm_free_buf(&data->lm);
heim_ntlm_free_buf(&data->ntlm);
if (data->targetname)
free(data->targetname);
if (data->username)
free(data->username);
if (data->ws)
free(data->ws);
heim_ntlm_free_buf(&data->sessionkey);
memset(data, 0, sizeof(*data));
}
/*
*
*/
int
heim_ntlm_decode_type3(const struct ntlm_buf *buf,
int ucs2,
struct ntlm_type3 *type3)
{
krb5_error_code ret;
unsigned char sig[8];
uint32_t type;
krb5_storage *in;
struct sec_buffer lm, ntlm, target, username, sessionkey, ws;
uint32_t min_offset = 0xffffffff;
memset(type3, 0, sizeof(*type3));
memset(&sessionkey, 0, sizeof(sessionkey));
in = krb5_storage_from_readonly_mem(buf->data, buf->length);
if (in == NULL) {
ret = ENOMEM;
goto out;
}
krb5_storage_set_byteorder(in, KRB5_STORAGE_BYTEORDER_LE);
CHECK_SIZE(krb5_storage_read(in, sig, sizeof(sig)), sizeof(sig));
CHECK(memcmp(ntlmsigature, sig, sizeof(ntlmsigature)), 0);
CHECK(krb5_ret_uint32(in, &type), 0);
CHECK(type, 3);
CHECK(ret_sec_buffer(in, &lm), 0);
if (lm.allocated)
min_offset = min(min_offset, lm.offset);
CHECK(ret_sec_buffer(in, &ntlm), 0);
if (ntlm.allocated)
min_offset = min(min_offset, ntlm.offset);
CHECK(ret_sec_buffer(in, &target), 0);
min_offset = min(min_offset, target.offset);
CHECK(ret_sec_buffer(in, &username), 0);
min_offset = min(min_offset, username.offset);
CHECK(ret_sec_buffer(in, &ws), 0);
if (ws.allocated)
min_offset = min(min_offset, ws.offset);
if (min_offset >= 52) {
CHECK(ret_sec_buffer(in, &sessionkey), 0);
min_offset = min(min_offset, sessionkey.offset);
CHECK(krb5_ret_uint32(in, &type3->flags), 0);
}
if (min_offset >= 52 + SIZE_SEC_BUFFER + 4 + SIZE_OS_VERSION) {
CHECK(krb5_ret_uint32(in, &type3->os[0]), 0);
CHECK(krb5_ret_uint32(in, &type3->os[1]), 0);
}
if (min_offset >= 52 + SIZE_SEC_BUFFER + 4 + SIZE_OS_VERSION + 16) {
type3->mic_offset = 52 + SIZE_SEC_BUFFER + 4 + SIZE_OS_VERSION;
CHECK_SIZE(krb5_storage_read(in, type3->mic, sizeof(type3->mic)), sizeof(type3->mic));
} else
type3->mic_offset = 0;
CHECK(ret_buf(in, &lm, &type3->lm), 0);
CHECK(ret_buf(in, &ntlm, &type3->ntlm), 0);
CHECK(ret_sec_string(in, ucs2, &target, &type3->targetname), 0);
CHECK(ret_sec_string(in, ucs2, &username, &type3->username), 0);
CHECK(ret_sec_string(in, ucs2, &ws, &type3->ws), 0);
if (sessionkey.offset)
CHECK(ret_buf(in, &sessionkey, &type3->sessionkey), 0);
out:
if (in)
krb5_storage_free(in);
if (ret)
heim_ntlm_free_type3(type3);
return ret;
}
/**
* Encodes an ntlm_type3 message.
*
* @param type3 the ntlm_type3 message to encode.
* @param data is the return buffer with the encoded message, should be
* freed with heim_ntlm_free_buf().
*
* @return In case of success 0 is return, an errors, a errno in what
* went wrong.
*
* @ingroup ntlm_core
*/
int
heim_ntlm_encode_type3(const struct ntlm_type3 *type3, struct ntlm_buf *data, size_t *mic_offset)
{
struct sec_buffer lm, ntlm, target, username, sessionkey, ws;
krb5_error_code ret;
krb5_storage *out = NULL;
uint32_t base;
int ucs2 = 0;
memset(&lm, 0, sizeof(lm));
memset(&ntlm, 0, sizeof(ntlm));
memset(&target, 0, sizeof(target));
memset(&username, 0, sizeof(username));
memset(&ws, 0, sizeof(ws));
memset(&sessionkey, 0, sizeof(sessionkey));
base = 52;
base += 8; /* sessionkey sec buf */
base += 4; /* flags */
if (type3->flags & NTLM_NEG_VERSION)
base += SIZE_OS_VERSION; /* os flags */
if (mic_offset) {
*mic_offset = base;
base += 16;
}
if (type3->flags & NTLM_NEG_UNICODE)
ucs2 = 1;
target.offset = base;
target.length = len_string(ucs2, type3->targetname);
target.allocated = target.length;
username.offset = target.offset + target.allocated;
username.length = len_string(ucs2, type3->username);
username.allocated = username.length;
ws.offset = username.offset + username.allocated;
ws.length = len_string(ucs2, type3->ws);
ws.allocated = ws.length;
lm.offset = ws.offset + ws.allocated;
lm.length = type3->lm.length;
lm.allocated = type3->lm.length;
ntlm.offset = lm.offset + lm.allocated;
ntlm.length = type3->ntlm.length;
ntlm.allocated = ntlm.length;
sessionkey.offset = ntlm.offset + ntlm.allocated;
sessionkey.length = type3->sessionkey.length;
sessionkey.allocated = type3->sessionkey.length;
out = krb5_storage_emem();
if (out == NULL)
return ENOMEM;
krb5_storage_set_byteorder(out, KRB5_STORAGE_BYTEORDER_LE);
CHECK_SIZE(krb5_storage_write(out, ntlmsigature, sizeof(ntlmsigature)),
sizeof(ntlmsigature));
CHECK(krb5_store_uint32(out, 3), 0);
CHECK(store_sec_buffer(out, &lm), 0);
CHECK(store_sec_buffer(out, &ntlm), 0);
CHECK(store_sec_buffer(out, &target), 0);
CHECK(store_sec_buffer(out, &username), 0);
CHECK(store_sec_buffer(out, &ws), 0);
CHECK(store_sec_buffer(out, &sessionkey), 0);
CHECK(krb5_store_uint32(out, type3->flags), 0);
/* os version */
if (type3->flags & NTLM_NEG_VERSION) {
CHECK(encode_os_version(out), 0);
}
if (mic_offset) {
static const uint8_t buf[16] = { 0 };
CHECK_SIZE(krb5_storage_write(out, buf, sizeof(buf)), sizeof(buf));
}
CHECK(put_string(out, ucs2, type3->targetname), 0);
CHECK(put_string(out, ucs2, type3->username), 0);
CHECK(put_string(out, ucs2, type3->ws), 0);
CHECK(put_buf(out, &type3->lm), 0);
CHECK(put_buf(out, &type3->ntlm), 0);
CHECK(put_buf(out, &type3->sessionkey), 0);
{
krb5_data d;
ret = krb5_storage_to_data(out, &d);
data->data = d.data;
data->length = d.length;
}
out:
krb5_storage_free(out);
return ret;
}
/*
*
*/
static void
splitandenc(unsigned char *hash,
unsigned char *challenge,
unsigned char *answer)
{
EVP_CIPHER_CTX ctx;
unsigned char key[8];
key[0] = hash[0];
key[1] = (hash[0] << 7) | (hash[1] >> 1);
key[2] = (hash[1] << 6) | (hash[2] >> 2);
key[3] = (hash[2] << 5) | (hash[3] >> 3);
key[4] = (hash[3] << 4) | (hash[4] >> 4);
key[5] = (hash[4] << 3) | (hash[5] >> 5);
key[6] = (hash[5] << 2) | (hash[6] >> 6);
key[7] = (hash[6] << 1);
EVP_CIPHER_CTX_init(&ctx);
EVP_CipherInit_ex(&ctx, EVP_des_cbc(), NULL, key, NULL, 1);
EVP_Cipher(&ctx, answer, challenge, 8);
EVP_CIPHER_CTX_cleanup(&ctx);
memset(key, 0, sizeof(key));
}
/**
* Calculate the NTLM key, the password is assumed to be in UTF8.
*
* @param password password to calcute the key for.
* @param key calcuted key, should be freed with heim_ntlm_free_buf().
*
* @return In case of success 0 is return, an errors, a errno in what
* went wrong.
*
* @ingroup ntlm_core
*/
int
heim_ntlm_nt_key(const char *password, struct ntlm_buf *key)
{
struct ntlm_buf buf;
EVP_MD_CTX *m;
int ret;
key->data = malloc(MD4_DIGEST_LENGTH);
if (key->data == NULL)
return ENOMEM;
key->length = MD4_DIGEST_LENGTH;
ret = ascii2ucs2le(password, 0, &buf);
if (ret) {
heim_ntlm_free_buf(key);
return ret;
}
m = EVP_MD_CTX_create();
if (m == NULL) {
heim_ntlm_free_buf(key);
heim_ntlm_free_buf(&buf);
return ENOMEM;
}
EVP_DigestInit_ex(m, EVP_md4(), NULL);
EVP_DigestUpdate(m, buf.data, buf.length);
EVP_DigestFinal_ex(m, key->data, NULL);
EVP_MD_CTX_destroy(m);
heim_ntlm_free_buf(&buf);
return 0;
}
/**
* Calculate NTLMv1 response hash
*
* @param key the ntlm v1 key
* @param len length of key
* @param challenge sent by the server
* @param answer calculated answer, should be freed with heim_ntlm_free_buf().
*
* @return In case of success 0 is return, an errors, a errno in what
* went wrong.
*
* @ingroup ntlm_core
*/
int
heim_ntlm_calculate_ntlm1(void *key, size_t len,
unsigned char challenge[8],
struct ntlm_buf *answer)
{
unsigned char res[21];
if (len != MD4_DIGEST_LENGTH)
return HNTLM_ERR_INVALID_LENGTH;
memcpy(res, key, len);
memset(&res[MD4_DIGEST_LENGTH], 0, sizeof(res) - MD4_DIGEST_LENGTH);
answer->data = malloc(24);
if (answer->data == NULL)
return ENOMEM;
answer->length = 24;
splitandenc(&res[0], challenge, ((unsigned char *)answer->data) + 0);
splitandenc(&res[7], challenge, ((unsigned char *)answer->data) + 8);
splitandenc(&res[14], challenge, ((unsigned char *)answer->data) + 16);
return 0;
}
int
heim_ntlm_v1_base_session(void *key, size_t len,
struct ntlm_buf *session)
{
EVP_MD_CTX *m;
session->length = MD4_DIGEST_LENGTH;
session->data = malloc(session->length);
if (session->data == NULL) {
session->length = 0;
return ENOMEM;
}
m = EVP_MD_CTX_create();
if (m == NULL) {
heim_ntlm_free_buf(session);
return ENOMEM;
}
EVP_DigestInit_ex(m, EVP_md4(), NULL);
EVP_DigestUpdate(m, key, len);
EVP_DigestFinal_ex(m, session->data, NULL);
EVP_MD_CTX_destroy(m);
return 0;
}
int
heim_ntlm_v2_base_session(void *key, size_t len,
struct ntlm_buf *ntlmResponse,
struct ntlm_buf *session)
{
unsigned int hmaclen;
HMAC_CTX c;
if (ntlmResponse->length <= 16)
return HNTLM_ERR_INVALID_LENGTH;
session->data = malloc(16);
if (session->data == NULL)
return ENOMEM;
session->length = 16;
/* Note: key is the NTLMv2 key */
HMAC_CTX_init(&c);
HMAC_Init_ex(&c, key, len, EVP_md5(), NULL);
HMAC_Update(&c, ntlmResponse->data, 16);
HMAC_Final(&c, session->data, &hmaclen);
HMAC_CTX_cleanup(&c);
return 0;
}
int
heim_ntlm_keyex_wrap(struct ntlm_buf *base_session,
struct ntlm_buf *session,
struct ntlm_buf *encryptedSession)
{
EVP_CIPHER_CTX c;
int ret;
if (base_session->length != MD4_DIGEST_LENGTH)
return HNTLM_ERR_INVALID_LENGTH;
session->length = MD4_DIGEST_LENGTH;
session->data = malloc(session->length);
if (session->data == NULL) {
session->length = 0;
return ENOMEM;
}
encryptedSession->length = MD4_DIGEST_LENGTH;
encryptedSession->data = malloc(encryptedSession->length);
if (encryptedSession->data == NULL) {
heim_ntlm_free_buf(session);
encryptedSession->length = 0;
return ENOMEM;
}
EVP_CIPHER_CTX_init(&c);
ret = EVP_CipherInit_ex(&c, EVP_rc4(), NULL, base_session->data, NULL, 1);
if (ret != 1) {
EVP_CIPHER_CTX_cleanup(&c);
heim_ntlm_free_buf(encryptedSession);
heim_ntlm_free_buf(session);
return HNTLM_ERR_CRYPTO;
}
if (RAND_bytes(session->data, session->length) != 1) {
EVP_CIPHER_CTX_cleanup(&c);
heim_ntlm_free_buf(encryptedSession);
heim_ntlm_free_buf(session);
return HNTLM_ERR_RAND;
}
EVP_Cipher(&c, encryptedSession->data, session->data, encryptedSession->length);
EVP_CIPHER_CTX_cleanup(&c);
return 0;
}
/**
* Generates an NTLMv1 session random with assosited session master key.
*
* @param key the ntlm v1 key
* @param len length of key
* @param session generated session nonce, should be freed with heim_ntlm_free_buf().
* @param master calculated session master key, should be freed with heim_ntlm_free_buf().
*
* @return In case of success 0 is return, an errors, a errno in what
* went wrong.
*
* @ingroup ntlm_core
*/
int
heim_ntlm_build_ntlm1_master(void *key, size_t len,
struct ntlm_buf *session,
struct ntlm_buf *master)
{
struct ntlm_buf sess;
int ret;
ret = heim_ntlm_v1_base_session(key, len, &sess);
if (ret)
return ret;
ret = heim_ntlm_keyex_wrap(&sess, session, master);
heim_ntlm_free_buf(&sess);
return ret;
}
/**
* Generates an NTLMv2 session random with associated session master key.
*
* @param key the NTLMv2 key
* @param len length of key
* @param blob the NTLMv2 "blob"
* @param session generated session nonce, should be freed with heim_ntlm_free_buf().
* @param master calculated session master key, should be freed with heim_ntlm_free_buf().
*
* @return In case of success 0 is return, an errors, a errno in what
* went wrong.
*
* @ingroup ntlm_core
*/
int
heim_ntlm_build_ntlm2_master(void *key, size_t len,
struct ntlm_buf *blob,
struct ntlm_buf *session,
struct ntlm_buf *master)
{
struct ntlm_buf sess;
int ret;
ret = heim_ntlm_v2_base_session(key, len, blob, &sess);
if (ret)
return ret;
ret = heim_ntlm_keyex_wrap(&sess, session, master);
heim_ntlm_free_buf(&sess);
return ret;
}
/**
* Given a key and encrypted session, unwrap the session key
*
* @param baseKey the sessionBaseKey
* @param encryptedSession encrypted session, type3.session field.
* @param session generated session nonce, should be freed with heim_ntlm_free_buf().
*
* @return In case of success 0 is return, an errors, a errno in what
* went wrong.
*
* @ingroup ntlm_core
*/
int
heim_ntlm_keyex_unwrap(struct ntlm_buf *baseKey,
struct ntlm_buf *encryptedSession,
struct ntlm_buf *session)
{
EVP_CIPHER_CTX c;
memset(session, 0, sizeof(*session));
if (encryptedSession->length != MD4_DIGEST_LENGTH)
return HNTLM_ERR_INVALID_LENGTH;
if (baseKey->length != MD4_DIGEST_LENGTH)
return HNTLM_ERR_INVALID_LENGTH;
session->length = MD4_DIGEST_LENGTH;
session->data = malloc(session->length);
if (session->data == NULL) {
session->length = 0;
return ENOMEM;
}
EVP_CIPHER_CTX_init(&c);
if (EVP_CipherInit_ex(&c, EVP_rc4(), NULL, baseKey->data, NULL, 0) != 1) {
EVP_CIPHER_CTX_cleanup(&c);
heim_ntlm_free_buf(session);
return HNTLM_ERR_CRYPTO;
}
EVP_Cipher(&c, session->data, encryptedSession->data, session->length);
EVP_CIPHER_CTX_cleanup(&c);
return 0;
}
/**
* Generates an NTLMv2 session key.
*
* @param key the ntlm key
* @param len length of key
* @param username name of the user, as sent in the message, assumed to be in UTF8.
* @param target the name of the target, assumed to be in UTF8.
* @param upper_case_target upper case the target, should not be used only for legacy systems
* @param ntlmv2 the ntlmv2 session key
*
* @return 0 on success, or an error code on failure.
*
* @ingroup ntlm_core
*/
int
heim_ntlm_ntlmv2_key(const void *key, size_t len,
const char *username,
const char *target,
int upper_case_target,
unsigned char ntlmv2[16])
{
int ret;
unsigned int hmaclen;
HMAC_CTX c;
HMAC_CTX_init(&c);
HMAC_Init_ex(&c, key, len, EVP_md5(), NULL);
{
struct ntlm_buf buf;
/* uppercase username and turn it into ucs2-le */
ret = ascii2ucs2le(username, 1, &buf);
if (ret)
goto out;
HMAC_Update(&c, buf.data, buf.length);
free(buf.data);
/* turn target into ucs2-le */
ret = ascii2ucs2le(target, upper_case_target, &buf);
if (ret)
goto out;
HMAC_Update(&c, buf.data, buf.length);
free(buf.data);
}
HMAC_Final(&c, ntlmv2, &hmaclen);
out:
HMAC_CTX_cleanup(&c);
memset(&c, 0, sizeof(c));
return ret;
}
/*
*
*/
#define NTTIME_EPOCH 0x019DB1DED53E8000LL
uint64_t
heim_ntlm_unix2ts_time(time_t unix_time)
{
long long wt;
wt = unix_time * (uint64_t)10000000 + (uint64_t)NTTIME_EPOCH;
return wt;
}
time_t
heim_ntlm_ts2unixtime(uint64_t t)
{
t = ((t - (uint64_t)NTTIME_EPOCH) / (uint64_t)10000000);
if (t > (((uint64_t)(time_t)(~(uint64_t)0)) >> 1))
return 0;
return (time_t)t;
}
/**
* Calculate LMv2 response
*
* @param key the ntlm key
* @param len length of key
* @param username name of the user, as sent in the message, assumed to be in UTF8.
* @param target the name of the target, assumed to be in UTF8.
* @param serverchallenge challenge as sent by the server in the type2 message.
* @param infotarget infotarget as sent by the server in the type2 message.
* @param ntlmv2 calculated session key
* @param answer ntlm response answer, should be freed with heim_ntlm_free_buf().
*
* @return In case of success 0 is return, an errors, a errno in what
* went wrong.
*
* @ingroup ntlm_core
*/
int
heim_ntlm_calculate_lm2(const void *key, size_t len,
const char *username,
const char *target,
const unsigned char serverchallenge[8],
unsigned char ntlmv2[16],
struct ntlm_buf *answer)
{
unsigned char clientchallenge[8];
if (RAND_bytes(clientchallenge, sizeof(clientchallenge)) != 1)
return HNTLM_ERR_RAND;
/* calculate ntlmv2 key */
heim_ntlm_ntlmv2_key(key, len, username, target, 0, ntlmv2);
answer->data = malloc(24);
if (answer->data == NULL)
return ENOMEM;
answer->length = 24;
heim_ntlm_derive_ntlm2_sess(ntlmv2, clientchallenge, 8,
serverchallenge, answer->data);
memcpy(((unsigned char *)answer->data) + 16, clientchallenge, 8);
return 0;
}
/**
* Calculate NTLMv2 response
*
* @param key the ntlm key
* @param len length of key
* @param username name of the user, as sent in the message, assumed to be in UTF8.
* @param target the name of the target, assumed to be in UTF8.
* @param serverchallenge challenge as sent by the server in the type2 message.
* @param infotarget infotarget as sent by the server in the type2 message.
* @param ntlmv2 calculated session key
* @param answer ntlm response answer, should be freed with heim_ntlm_free_buf().
*
* @return In case of success 0 is return, an errors, a errno in what
* went wrong.
*
* @ingroup ntlm_core
*/
int
heim_ntlm_calculate_ntlm2(const void *key, size_t len,
const char *username,
const char *target,
const unsigned char serverchallenge[8],
const struct ntlm_buf *infotarget,
unsigned char ntlmv2[16],
struct ntlm_buf *answer)
{
krb5_error_code ret;
krb5_data data;
unsigned char ntlmv2answer[16];
krb5_storage *sp;
unsigned char clientchallenge[8];
uint64_t t;
t = heim_ntlm_unix2ts_time(time(NULL));
if (RAND_bytes(clientchallenge, sizeof(clientchallenge)) != 1)
return HNTLM_ERR_RAND;
/* calculate ntlmv2 key */
heim_ntlm_ntlmv2_key(key, len, username, target, 0, ntlmv2);
/* calculate and build ntlmv2 answer */
sp = krb5_storage_emem();
if (sp == NULL)
return ENOMEM;
krb5_storage_set_flags(sp, KRB5_STORAGE_BYTEORDER_LE);
CHECK(krb5_store_uint32(sp, 0x00000101), 0);
CHECK(krb5_store_uint32(sp, 0), 0);
/* timestamp le 64 bit ts */
CHECK(krb5_store_uint32(sp, t & 0xffffffff), 0);
CHECK(krb5_store_uint32(sp, t >> 32), 0);
CHECK_SIZE(krb5_storage_write(sp, clientchallenge, 8), 8);
CHECK(krb5_store_uint32(sp, 0), 0); /* Z(4) */
CHECK_SIZE(krb5_storage_write(sp, infotarget->data, infotarget->length),
infotarget->length);
/*
* These last 4 bytes(Z(4)) are not documented by MicroSoft and
* SnowLeopard doesn't send them, Lion expected them to be there,
* so we have to continue to send them. That is ok, since everyone
* else (except Snow) seems to do that too.
*/
CHECK(krb5_store_uint32(sp, 0), 0); /* Z(4) */
CHECK(krb5_storage_to_data(sp, &data), 0);
krb5_storage_free(sp);
sp = NULL;
heim_ntlm_derive_ntlm2_sess(ntlmv2, data.data, data.length, serverchallenge, ntlmv2answer);
sp = krb5_storage_emem();
if (sp == NULL) {
krb5_data_free(&data);
return ENOMEM;
}
CHECK_SIZE(krb5_storage_write(sp, ntlmv2answer, 16), 16);
CHECK_SIZE(krb5_storage_write(sp, data.data, data.length), data.length);
krb5_data_free(&data);
CHECK(krb5_storage_to_data(sp, &data), 0);
krb5_storage_free(sp);
sp = NULL;
answer->data = data.data;
answer->length = data.length;
return 0;
out:
if (sp)
krb5_storage_free(sp);
return ret;
}
static const int authtimediff = 3600 * 2; /* 2 hours */
static int
verify_ntlm2(const void *key, size_t len,
const char *username,
const char *target,
int upper_case_target,
time_t now,
const unsigned char serverchallenge[8],
const struct ntlm_buf *answer,
struct ntlm_buf *infotarget,
unsigned char ntlmv2[16])
{
krb5_error_code ret;
unsigned char clientanswer[16];
unsigned char clientnonce[8];
unsigned char serveranswer[16];
krb5_storage *sp;
uint64_t t;
time_t authtime;
uint32_t temp;
infotarget->length = 0;
infotarget->data = NULL;
if (answer->length < 16)
return HNTLM_ERR_INVALID_LENGTH;
if (now == 0)
now = time(NULL);
/* calculate ntlmv2 key */
heim_ntlm_ntlmv2_key(key, len, username, target, upper_case_target, ntlmv2);
/* calculate and build ntlmv2 answer */
sp = krb5_storage_from_readonly_mem(answer->data, answer->length);
if (sp == NULL)
return ENOMEM;
krb5_storage_set_flags(sp, KRB5_STORAGE_BYTEORDER_LE);
CHECK_SIZE(krb5_storage_read(sp, clientanswer, 16), 16);
CHECK(krb5_ret_uint32(sp, &temp), 0);
CHECK(temp, 0x00000101);
CHECK(krb5_ret_uint32(sp, &temp), 0);
CHECK(temp, 0);
/* timestamp le 64 bit ts */
CHECK(krb5_ret_uint32(sp, &temp), 0);
t = temp;
CHECK(krb5_ret_uint32(sp, &temp), 0);
t |= ((uint64_t)temp)<< 32;
authtime = heim_ntlm_ts2unixtime(t);
if (labs((int)(authtime - now)) > authtimediff) {
ret = HNTLM_ERR_TIME_SKEW;
goto out;
}
/* client challenge */
CHECK_SIZE(krb5_storage_read(sp, clientnonce, 8), 8);
CHECK(krb5_ret_uint32(sp, &temp), 0); /* Z(4) */
/* let pick up targetinfo */
infotarget->length = answer->length - (size_t)krb5_storage_seek(sp, 0, SEEK_CUR);
if (infotarget->length < 4) {
ret = HNTLM_ERR_INVALID_LENGTH;
goto out;
}
infotarget->data = malloc(infotarget->length);
if (infotarget->data == NULL) {
ret = ENOMEM;
goto out;
}
CHECK_SIZE(krb5_storage_read(sp, infotarget->data, infotarget->length),
infotarget->length);
krb5_storage_free(sp);
sp = NULL;
if (answer->length < 16) {
ret = HNTLM_ERR_INVALID_LENGTH;
goto out;
}
heim_ntlm_derive_ntlm2_sess(ntlmv2,
((unsigned char *)answer->data) + 16, answer->length - 16,
serverchallenge,
serveranswer);
if (memcmp(serveranswer, clientanswer, 16) != 0) {
heim_ntlm_free_buf(infotarget);
return HNTLM_ERR_AUTH;
}
return 0;
out:
heim_ntlm_free_buf(infotarget);
if (sp)
krb5_storage_free(sp);
return ret;
}
/**
* Verify NTLMv2 response.
*
* @param key the ntlm key
* @param len length of key
* @param username name of the user, as sent in the message, assumed to be in UTF8.
* @param target the name of the target, assumed to be in UTF8.
* @param now the time now (0 if the library should pick it up itself)
* @param serverchallenge challenge as sent by the server in the type2 message.
* @param answer ntlm response answer, should be freed with heim_ntlm_free_buf().
* @param infotarget infotarget as sent by the server in the type2 message.
* @param ntlmv2 calculated session key
*
* @return In case of success 0 is return, an errors, a errno in what
* went wrong.
*
* @ingroup ntlm_core
*/
int
heim_ntlm_verify_ntlm2(const void *key, size_t len,
const char *username,
const char *target,
time_t now,
const unsigned char serverchallenge[8],
const struct ntlm_buf *answer,
struct ntlm_buf *infotarget,
unsigned char ntlmv2[16])
{
int ret;
/**
* First check with the domain as the client passed it to the function.
*/
ret = verify_ntlm2(key, len, username, target, 0, now,
serverchallenge, answer, infotarget, ntlmv2);
/**
* Second check with domain uppercased.
*/
if (ret)
ret = verify_ntlm2(key, len, username, target, 1, now,
serverchallenge, answer, infotarget, ntlmv2);
/**
* Third check with empty domain.
*/
if (ret)
ret = verify_ntlm2(key, len, username, "", 0, now,
serverchallenge, answer, infotarget, ntlmv2);
return ret;
}
/*
* Calculate the NTLM2 Session Response
*
* @param clnt_nonce client nonce
* @param svr_chal server challage
* @param ntlm2_hash ntlm hash
* @param lm The LM response, should be freed with heim_ntlm_free_buf().
* @param ntlm The NTLM response, should be freed with heim_ntlm_free_buf().
*
* @return In case of success 0 is return, an errors, a errno in what
* went wrong.
*
* @ingroup ntlm_core
*/
int
heim_ntlm_calculate_ntlm2_sess(const unsigned char clnt_nonce[8],
const unsigned char svr_chal[8],
const unsigned char ntlm_hash[16],
struct ntlm_buf *lm,
struct ntlm_buf *ntlm)
{
unsigned char ntlm2_sess_hash[8];
unsigned char res[21], *resp;
int code;
code = heim_ntlm_calculate_ntlm2_sess_hash(clnt_nonce, svr_chal,
ntlm2_sess_hash);
if (code) {
return code;
}
lm->data = malloc(24);
if (lm->data == NULL) {
return ENOMEM;
}
lm->length = 24;
ntlm->data = malloc(24);
if (ntlm->data == NULL) {
free(lm->data);
lm->data = NULL;
return ENOMEM;
}
ntlm->length = 24;
/* first setup the lm resp */
memset(lm->data, 0, 24);
memcpy(lm->data, clnt_nonce, 8);
memset(res, 0, sizeof(res));
memcpy(res, ntlm_hash, 16);
resp = ntlm->data;
splitandenc(&res[0], ntlm2_sess_hash, resp + 0);
splitandenc(&res[7], ntlm2_sess_hash, resp + 8);
splitandenc(&res[14], ntlm2_sess_hash, resp + 16);
return 0;
}
/*
* Calculate the NTLM2 Session "Verifier"
*
* @param clnt_nonce client nonce
* @param svr_chal server challage
* @param hash The NTLM session verifier
*
* @return In case of success 0 is return, an errors, a errno in what
* went wrong.
*
* @ingroup ntlm_core
*/
int
heim_ntlm_calculate_ntlm2_sess_hash(const unsigned char clnt_nonce[8],
const unsigned char svr_chal[8],
unsigned char verifier[8])
{
unsigned char ntlm2_sess_hash[MD5_DIGEST_LENGTH];
EVP_MD_CTX *m;
m = EVP_MD_CTX_create();
if (m == NULL)
return ENOMEM;
EVP_DigestInit_ex(m, EVP_md5(), NULL);
EVP_DigestUpdate(m, svr_chal, 8); /* session nonce part 1 */
EVP_DigestUpdate(m, clnt_nonce, 8); /* session nonce part 2 */
EVP_DigestFinal_ex(m, ntlm2_sess_hash, NULL); /* will only use first 8 bytes */
EVP_MD_CTX_destroy(m);
memcpy(verifier, ntlm2_sess_hash, 8);
return 0;
}
/*
* Derive a NTLM2 session key
*
* @param sessionkey session key from domain controller
* @param clnt_nonce client nonce
* @param svr_chal server challenge
* @param derivedkey salted session key
*
* @return In case of success 0 is return, an errors, a errno in what
* went wrong.
*
* @ingroup ntlm_core
*/
void
heim_ntlm_derive_ntlm2_sess(const unsigned char sessionkey[16],
const unsigned char *clnt_nonce, size_t clnt_nonce_length,
const unsigned char svr_chal[8],
unsigned char derivedkey[16])
{
unsigned int hmaclen;
HMAC_CTX c;
/* HMAC(Ksession, serverchallenge || clientchallenge) */
HMAC_CTX_init(&c);
HMAC_Init_ex(&c, sessionkey, 16, EVP_md5(), NULL);
HMAC_Update(&c, svr_chal, 8);
HMAC_Update(&c, clnt_nonce, clnt_nonce_length);
HMAC_Final(&c, derivedkey, &hmaclen);
HMAC_CTX_cleanup(&c);
memset(&c, 0, sizeof(c));
}
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