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Diffstat (limited to 'crypto/heimdal/lib/ntlm/ntlm.c')
| -rw-r--r-- | crypto/heimdal/lib/ntlm/ntlm.c | 1364 |
1 files changed, 1364 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/ntlm/ntlm.c b/crypto/heimdal/lib/ntlm/ntlm.c new file mode 100644 index 0000000..f3dccfa --- /dev/null +++ b/crypto/heimdal/lib/ntlm/ntlm.c @@ -0,0 +1,1364 @@ +/* + * 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; +} |
