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freebsd/crypto/heimdal/lib/ntlm/ntlm.c
Doug Rabson c19800e8cd Vendor import of Heimdal 1.1
2008-05-07 13:39:42 +00:00

1365 lines
34 KiB
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/*
* Copyright (c) 2006 - 2007 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* 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>
RCSID("$Id: ntlm.c 22370 2007-12-28 16:12:01Z lha $");
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <krb5.h>
#include <roken.h>
#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 hashes).
*
* More information about the NTLM protocol can found here
* http://davenport.sourceforge.net/ntlm.html .
*
* The Heimdal projects web page: http://www.h5l.org/
*/
/** @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";
/*
*
*/
#define CHECK(f, e) \
do { ret = f ; if (ret != (e)) { ret = EINVAL; goto out; } } while(0)
/**
* 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)
{
unsigned char *p;
size_t len, i;
len = strlen(string);
if (len / 2 > UINT_MAX)
return ERANGE;
buf->length = len * 2;
buf->data = malloc(buf->length);
if (buf->data == NULL && len != 0) {
heim_ntlm_free_buf(buf);
return ENOMEM;
}
p = buf->data;
for (i = 0; i < len; i++) {
unsigned char t = (unsigned char)string[i];
if (t & 0x80) {
heim_ntlm_free_buf(buf);
return EINVAL;
}
if (up)
t = toupper(t);
p[(i * 2) + 0] = t;
p[(i * 2) + 1] = 0;
}
return 0;
}
/*
*
*/
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 krb5_error_code
len_string(int ucs2, const char *s)
{
size_t len = strlen(s);
if (ucs2)
len *= 2;
return len;
}
static krb5_error_code
ret_string(krb5_storage *sp, int ucs2, struct sec_buffer *desc, char **s)
{
krb5_error_code ret;
*s = malloc(desc->length + 1);
CHECK(krb5_storage_seek(sp, desc->offset, SEEK_SET), desc->offset);
CHECK(krb5_storage_read(sp, *s, desc->length), desc->length);
(*s)[desc->length] = '\0';
if (ucs2) {
size_t i;
for (i = 0; i < desc->length / 2; i++) {
(*s)[i] = (*s)[i * 2];
if ((*s)[i * 2 + 1]) {
free(*s);
*s = NULL;
return EINVAL;
}
}
(*s)[i] = '\0';
}
ret = 0;
out:
return ret;
return 0;
}
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(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(krb5_storage_seek(sp, desc->offset, SEEK_SET), desc->offset);
CHECK(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(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);
memset(ti, 0, sizeof(*ti));
}
static int
encode_ti_blob(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 if the strings should be encoded with ucs2 (selected by flag in message).
* @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;
if (ti->servername)
CHECK(encode_ti_blob(out, 1, ucs2, ti->servername), 0);
if (ti->domainname)
CHECK(encode_ti_blob(out, 2, ucs2, ti->domainname), 0);
if (ti->dnsservername)
CHECK(encode_ti_blob(out, 3, ucs2, ti->dnsservername), 0);
if (ti->dnsdomainname)
CHECK(encode_ti_blob(out, 4, ucs2, ti->dnsdomainname), 0);
/* 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)
{
memset(ti, 0, sizeof(*ti));
return 0;
}
/**
* 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;
memset(data, 0, sizeof(*data));
in = krb5_storage_from_readonly_mem(buf->data, buf->length);
if (in == NULL) {
ret = EINVAL;
goto out;
}
krb5_storage_set_byteorder(in, KRB5_STORAGE_BYTEORDER_LE);
CHECK(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);
if (data->flags & NTLM_SUPPLIED_DOMAIN)
CHECK(ret_sec_buffer(in, &domain), 0);
if (data->flags & NTLM_SUPPLIED_WORKSTAION)
CHECK(ret_sec_buffer(in, &hostname), 0);
#if 0
if (domain.offset > 32) {
CHECK(krb5_ret_uint32(in, &data->os[0]), 0);
CHECK(krb5_ret_uint32(in, &data->os[1]), 0);
}
#endif
if (data->flags & NTLM_SUPPLIED_DOMAIN)
CHECK(ret_string(in, 0, &domain, &data->domain), 0);
if (data->flags & NTLM_SUPPLIED_WORKSTAION)
CHECK(ret_string(in, 0, &hostname, &data->hostname), 0);
out:
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;
flags = type1->flags;
base = 16;
if (type1->domain) {
base += 8;
flags |= NTLM_SUPPLIED_DOMAIN;
}
if (type1->hostname) {
base += 8;
flags |= NTLM_SUPPLIED_WORKSTAION;
}
if (type1->os[0])
base += 8;
if (type1->domain) {
domain.offset = base;
domain.length = len_string(0, type1->domain);
domain.allocated = domain.length;
}
if (type1->hostname) {
hostname.offset = domain.allocated + domain.offset;
hostname.length = len_string(0, type1->hostname);
hostname.allocated = hostname.length;
}
out = krb5_storage_emem();
if (out == NULL)
return ENOMEM;
krb5_storage_set_byteorder(out, KRB5_STORAGE_BYTEORDER_LE);
CHECK(krb5_storage_write(out, ntlmsigature, sizeof(ntlmsigature)),
sizeof(ntlmsigature));
CHECK(krb5_store_uint32(out, 1), 0);
CHECK(krb5_store_uint32(out, flags), 0);
if (type1->domain)
CHECK(store_sec_buffer(out, &domain), 0);
if (type1->hostname)
CHECK(store_sec_buffer(out, &hostname), 0);
if (type1->os[0]) {
CHECK(krb5_store_uint32(out, type1->os[0]), 0);
CHECK(krb5_store_uint32(out, type1->os[1]), 0);
}
if (type1->domain)
CHECK(put_string(out, 0, type1->domain), 0);
if (type1->hostname)
CHECK(put_string(out, 0, 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 = EINVAL;
goto out;
}
krb5_storage_set_byteorder(in, KRB5_STORAGE_BYTEORDER_LE);
CHECK(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(krb5_storage_read(in, type2->challange, sizeof(type2->challange)),
sizeof(type2->challange));
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 0
CHECK(krb5_ret_uint32(in, &type2->os[0]), 0);
CHECK(krb5_ret_uint32(in, &type2->os[1]), 0);
#endif
CHECK(ret_string(in, ucs2, &targetname, &type2->targetname), 0);
CHECK(ret_buf(in, &targetinfo, &type2->targetinfo), 0);
ret = 0;
out:
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;
if (type2->os[0])
base = 56;
else
base = 48;
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(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(krb5_storage_write(out, type2->challange, sizeof(type2->challange)),
sizeof(type2->challange));
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->os[0]) {
CHECK(krb5_store_uint32(out, type2->os[0]), 0);
CHECK(krb5_store_uint32(out, type2->os[1]), 0);
}
CHECK(put_string(out, ucs2, type2->targetname), 0);
CHECK(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;
memset(type3, 0, sizeof(*type3));
memset(&sessionkey, 0, sizeof(sessionkey));
in = krb5_storage_from_readonly_mem(buf->data, buf->length);
if (in == NULL) {
ret = EINVAL;
goto out;
}
krb5_storage_set_byteorder(in, KRB5_STORAGE_BYTEORDER_LE);
CHECK(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);
CHECK(ret_sec_buffer(in, &ntlm), 0);
CHECK(ret_sec_buffer(in, &target), 0);
CHECK(ret_sec_buffer(in, &username), 0);
CHECK(ret_sec_buffer(in, &ws), 0);
if (lm.offset >= 60) {
CHECK(ret_sec_buffer(in, &sessionkey), 0);
}
if (lm.offset >= 64) {
CHECK(krb5_ret_uint32(in, &type3->flags), 0);
}
if (lm.offset >= 72) {
CHECK(krb5_ret_uint32(in, &type3->os[0]), 0);
CHECK(krb5_ret_uint32(in, &type3->os[1]), 0);
}
CHECK(ret_buf(in, &lm, &type3->lm), 0);
CHECK(ret_buf(in, &ntlm, &type3->ntlm), 0);
CHECK(ret_string(in, ucs2, &target, &type3->targetname), 0);
CHECK(ret_string(in, ucs2, &username, &type3->username), 0);
CHECK(ret_string(in, ucs2, &ws, &type3->ws), 0);
if (sessionkey.offset)
CHECK(ret_buf(in, &sessionkey, &type3->sessionkey), 0);
out:
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)
{
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;
if (type3->sessionkey.length) {
base += 8; /* sessionkey sec buf */
base += 4; /* flags */
}
if (type3->os[0]) {
base += 8;
}
if (type3->flags & NTLM_NEG_UNICODE)
ucs2 = 1;
lm.offset = base;
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;
target.offset = ntlm.offset + ntlm.allocated;
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;
sessionkey.offset = ws.offset + ws.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(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);
/* optional */
if (type3->sessionkey.length) {
CHECK(store_sec_buffer(out, &sessionkey), 0);
CHECK(krb5_store_uint32(out, type3->flags), 0);
}
#if 0
CHECK(krb5_store_uint32(out, 0), 0); /* os0 */
CHECK(krb5_store_uint32(out, 0), 0); /* os1 */
#endif
CHECK(put_buf(out, &type3->lm), 0);
CHECK(put_buf(out, &type3->ntlm), 0);
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->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 *challange,
unsigned char *answer)
{
DES_cblock key;
DES_key_schedule sched;
((unsigned char*)key)[0] = hash[0];
((unsigned char*)key)[1] = (hash[0] << 7) | (hash[1] >> 1);
((unsigned char*)key)[2] = (hash[1] << 6) | (hash[2] >> 2);
((unsigned char*)key)[3] = (hash[2] << 5) | (hash[3] >> 3);
((unsigned char*)key)[4] = (hash[3] << 4) | (hash[4] >> 4);
((unsigned char*)key)[5] = (hash[4] << 3) | (hash[5] >> 5);
((unsigned char*)key)[6] = (hash[5] << 2) | (hash[6] >> 6);
((unsigned char*)key)[7] = (hash[6] << 1);
DES_set_odd_parity(&key);
DES_set_key(&key, &sched);
DES_ecb_encrypt((DES_cblock *)challange, (DES_cblock *)answer, &sched, 1);
memset(&sched, 0, sizeof(sched));
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;
MD4_CTX ctx;
int ret;
key->data = malloc(MD5_DIGEST_LENGTH);
if (key->data == NULL)
return ENOMEM;
key->length = MD5_DIGEST_LENGTH;
ret = ascii2ucs2le(password, 0, &buf);
if (ret) {
heim_ntlm_free_buf(key);
return ret;
}
MD4_Init(&ctx);
MD4_Update(&ctx, buf.data, buf.length);
MD4_Final(key->data, &ctx);
heim_ntlm_free_buf(&buf);
return 0;
}
/**
* Calculate NTLMv1 response hash
*
* @param key the ntlm v1 key
* @param len length of key
* @param challange 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 challange[8],
struct ntlm_buf *answer)
{
unsigned char res[21];
if (len != MD4_DIGEST_LENGTH)
return EINVAL;
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], challange, ((unsigned char *)answer->data) + 0);
splitandenc(&res[7], challange, ((unsigned char *)answer->data) + 8);
splitandenc(&res[14], challange, ((unsigned char *)answer->data) + 16);
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)
{
RC4_KEY rc4;
memset(master, 0, sizeof(*master));
memset(session, 0, sizeof(*session));
if (len != MD4_DIGEST_LENGTH)
return EINVAL;
session->length = MD4_DIGEST_LENGTH;
session->data = malloc(session->length);
if (session->data == NULL) {
session->length = 0;
return EINVAL;
}
master->length = MD4_DIGEST_LENGTH;
master->data = malloc(master->length);
if (master->data == NULL) {
heim_ntlm_free_buf(master);
heim_ntlm_free_buf(session);
return EINVAL;
}
{
unsigned char sessionkey[MD4_DIGEST_LENGTH];
MD4_CTX ctx;
MD4_Init(&ctx);
MD4_Update(&ctx, key, len);
MD4_Final(sessionkey, &ctx);
RC4_set_key(&rc4, sizeof(sessionkey), sessionkey);
}
if (RAND_bytes(session->data, session->length) != 1) {
heim_ntlm_free_buf(master);
heim_ntlm_free_buf(session);
return EINVAL;
}
RC4(&rc4, master->length, session->data, master->data);
memset(&rc4, 0, sizeof(rc4));
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 ntlmv2 the ntlmv2 session key
*
* @ingroup ntlm_core
*/
void
heim_ntlm_ntlmv2_key(const void *key, size_t len,
const char *username,
const char *target,
unsigned char ntlmv2[16])
{
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 inte ucs2-le */
ascii2ucs2le(username, 1, &buf);
HMAC_Update(&c, buf.data, buf.length);
free(buf.data);
/* uppercase target and turn into ucs2-le */
ascii2ucs2le(target, 1, &buf);
HMAC_Update(&c, buf.data, buf.length);
free(buf.data);
}
HMAC_Final(&c, ntlmv2, &hmaclen);
HMAC_CTX_cleanup(&c);
}
/*
*
*/
#define NTTIME_EPOCH 0x019DB1DED53E8000LL
static uint64_t
unix2nttime(time_t unix_time)
{
long long wt;
wt = unix_time * (uint64_t)10000000 + (uint64_t)NTTIME_EPOCH;
return wt;
}
static time_t
nt2unixtime(uint64_t t)
{
t = ((t - (uint64_t)NTTIME_EPOCH) / (uint64_t)10000000);
if (t > (((time_t)(~(uint64_t)0)) >> 1))
return 0;
return (time_t)t;
}
/**
* 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 serverchallange challange 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 serverchallange[8],
const struct ntlm_buf *infotarget,
unsigned char ntlmv2[16],
struct ntlm_buf *answer)
{
krb5_error_code ret;
krb5_data data;
unsigned int hmaclen;
unsigned char ntlmv2answer[16];
krb5_storage *sp;
unsigned char clientchallange[8];
HMAC_CTX c;
uint64_t t;
t = unix2nttime(time(NULL));
if (RAND_bytes(clientchallange, sizeof(clientchallange)) != 1)
return EINVAL;
/* calculate ntlmv2 key */
heim_ntlm_ntlmv2_key(key, len, username, target, 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(krb5_storage_write(sp, clientchallange, 8), 8);
CHECK(krb5_store_uint32(sp, 0), 0); /* unknown but zero will work */
CHECK(krb5_storage_write(sp, infotarget->data, infotarget->length),
infotarget->length);
CHECK(krb5_store_uint32(sp, 0), 0); /* unknown but zero will work */
CHECK(krb5_storage_to_data(sp, &data), 0);
krb5_storage_free(sp);
sp = NULL;
HMAC_CTX_init(&c);
HMAC_Init_ex(&c, ntlmv2, 16, EVP_md5(), NULL);
HMAC_Update(&c, serverchallange, 8);
HMAC_Update(&c, data.data, data.length);
HMAC_Final(&c, ntlmv2answer, &hmaclen);
HMAC_CTX_cleanup(&c);
sp = krb5_storage_emem();
if (sp == NULL) {
krb5_data_free(&data);
return ENOMEM;
}
CHECK(krb5_storage_write(sp, ntlmv2answer, 16), 16);
CHECK(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 */
/**
* 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 serverchallange challange 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 serverchallange[8],
const struct ntlm_buf *answer,
struct ntlm_buf *infotarget,
unsigned char ntlmv2[16])
{
krb5_error_code ret;
unsigned int hmaclen;
unsigned char clientanswer[16];
unsigned char clientnonce[8];
unsigned char serveranswer[16];
krb5_storage *sp;
HMAC_CTX c;
uint64_t t;
time_t authtime;
uint32_t temp;
infotarget->length = 0;
infotarget->data = NULL;
if (answer->length < 16)
return EINVAL;
if (now == 0)
now = time(NULL);
/* calculate ntlmv2 key */
heim_ntlm_ntlmv2_key(key, len, username, 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(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 = nt2unixtime(t);
if (abs((int)(authtime - now)) > authtimediff) {
ret = EINVAL;
goto out;
}
/* client challange */
CHECK(krb5_storage_read(sp, clientnonce, 8), 8);
CHECK(krb5_ret_uint32(sp, &temp), 0); /* unknown */
/* should really unparse the infotarget, but lets pick up everything */
infotarget->length = answer->length - krb5_storage_seek(sp, 0, SEEK_CUR);
infotarget->data = malloc(infotarget->length);
if (infotarget->data == NULL) {
ret = ENOMEM;
goto out;
}
CHECK(krb5_storage_read(sp, infotarget->data, infotarget->length),
infotarget->length);
/* XXX remove the unknown ?? */
krb5_storage_free(sp);
sp = NULL;
HMAC_CTX_init(&c);
HMAC_Init_ex(&c, ntlmv2, 16, EVP_md5(), NULL);
HMAC_Update(&c, serverchallange, 8);
HMAC_Update(&c, ((unsigned char *)answer->data) + 16, answer->length - 16);
HMAC_Final(&c, serveranswer, &hmaclen);
HMAC_CTX_cleanup(&c);
if (memcmp(serveranswer, clientanswer, 16) != 0) {
heim_ntlm_free_buf(infotarget);
return EINVAL;
}
return 0;
out:
heim_ntlm_free_buf(infotarget);
if (sp)
krb5_storage_free(sp);
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[MD5_DIGEST_LENGTH];
unsigned char res[21], *resp;
MD5_CTX md5;
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);
MD5_Init(&md5);
MD5_Update(&md5, svr_chal, 8); /* session nonce part 1 */
MD5_Update(&md5, clnt_nonce, 8); /* session nonce part 2 */
MD5_Final(ntlm2_sess_hash, &md5); /* will only use first 8 bytes */
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;
}
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