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* FreeRDP: A Remote Desktop Protocol Client
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* NT LAN Manager Security Support Provider (NTLMSSP)
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* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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#include <openssl/des.h>
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#include <openssl/md4.h>
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#include <openssl/hmac.h>
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#include <openssl/rand.h>
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#include <openssl/engine.h>
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#include <freerdp/utils/memory.h>
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#define NTLMSSP_NEGOTIATE_56 0x80000000 /* W (0) */
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#define NTLMSSP_NEGOTIATE_KEY_EXCH 0x40000000 /* V (1) */
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#define NTLMSSP_NEGOTIATE_128 0x20000000 /* U (2) */
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#define NTLMSSP_RESERVED1 0x10000000 /* r1 (3) */
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#define NTLMSSP_RESERVED2 0x08000000 /* r2 (4) */
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#define NTLMSSP_RESERVED3 0x04000000 /* r3 (5) */
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#define NTLMSSP_NEGOTIATE_VERSION 0x02000000 /* T (6) */
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#define NTLMSSP_RESERVED4 0x01000000 /* r4 (7) */
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#define NTLMSSP_NEGOTIATE_TARGET_INFO 0x00800000 /* S (8) */
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#define NTLMSSP_RESERVEDEQUEST_NON_NT_SESSION_KEY 0x00400000 /* R (9) */
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#define NTLMSSP_RESERVED5 0x00200000 /* r5 (10) */
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#define NTLMSSP_NEGOTIATE_IDENTIFY 0x00100000 /* Q (11) */
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#define NTLMSSP_NEGOTIATE_EXTENDED_SESSION_SECURITY 0x00080000 /* P (12) */
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#define NTLMSSP_RESERVED6 0x00040000 /* r6 (13) */
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#define NTLMSSP_TARGET_TYPE_SERVER 0x00020000 /* O (14) */
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#define NTLMSSP_TARGET_TYPE_DOMAIN 0x00010000 /* N (15) */
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#define NTLMSSP_NEGOTIATE_ALWAYS_SIGN 0x00008000 /* M (16) */
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#define NTLMSSP_RESERVED7 0x00004000 /* r7 (17) */
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#define NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED 0x00002000 /* L (18) */
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#define NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED 0x00001000 /* K (19) */
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#define NTLMSSP_NEGOTIATE_ANONYMOUS 0x00000800 /* J (20) */
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#define NTLMSSP_RESERVED8 0x00000400 /* r8 (21) */
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#define NTLMSSP_NEGOTIATE_NTLM 0x00000200 /* H (22) */
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#define NTLMSSP_RESERVED9 0x00000100 /* r9 (23) */
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#define NTLMSSP_NEGOTIATE_LM_KEY 0x00000080 /* G (24) */
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#define NTLMSSP_NEGOTIATE_DATAGRAM 0x00000040 /* F (25) */
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#define NTLMSSP_NEGOTIATE_SEAL 0x00000020 /* E (26) */
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#define NTLMSSP_NEGOTIATE_SIGN 0x00000010 /* D (27) */
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#define NTLMSSP_RESERVED10 0x00000008 /* r10 (28) */
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#define NTLMSSP_REQUEST_TARGET 0x00000004 /* C (29) */
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#define NTLMSSP_NEGOTIATE_OEM 0x00000002 /* B (30) */
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#define NTLMSSP_NEGOTIATE_UNICODE 0x00000001 /* A (31) */
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#define WINDOWS_MAJOR_VERSION_5 0x05
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#define WINDOWS_MAJOR_VERSION_6 0x06
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#define WINDOWS_MINOR_VERSION_0 0x00
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#define WINDOWS_MINOR_VERSION_1 0x01
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#define WINDOWS_MINOR_VERSION_2 0x02
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#define NTLMSSP_REVISION_W2K3 0x0F
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static const char ntlm_signature[] = "NTLMSSP";
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static const char lm_magic[] = "KGS!@#$%";
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static const char client_sign_magic[] = "session key to client-to-server signing key magic constant";
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static const char server_sign_magic[] = "session key to server-to-client signing key magic constant";
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static const char client_seal_magic[] = "session key to client-to-server sealing key magic constant";
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static const char server_seal_magic[] = "session key to server-to-client sealing key magic constant";
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static const char* const NTLMSSP_NEGOTIATE_STRINGS[] =
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"NTLMSSP_NEGOTIATE_56",
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"NTLMSSP_NEGOTIATE_KEY_EXCH",
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"NTLMSSP_NEGOTIATE_128",
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"NTLMSSP_NEGOTIATE_VERSION",
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"NTLMSSP_NEGOTIATE_TARGET_INFO",
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"NTLMSSP_REQUEST_NON_NT_SESSION_KEY",
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"NTLMSSP_NEGOTIATE_IDENTIFY",
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"NTLMSSP_NEGOTIATE_EXTENDED_SESSION_SECURITY",
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"NTLMSSP_TARGET_TYPE_SERVER",
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"NTLMSSP_TARGET_TYPE_DOMAIN",
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"NTLMSSP_NEGOTIATE_ALWAYS_SIGN",
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"NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED",
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"NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED",
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"NTLMSSP_NEGOTIATE_ANONYMOUS",
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"NTLMSSP_NEGOTIATE_NTLM",
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"NTLMSSP_NEGOTIATE_LM_KEY",
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"NTLMSSP_NEGOTIATE_DATAGRAM",
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"NTLMSSP_NEGOTIATE_SEAL",
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"NTLMSSP_NEGOTIATE_SIGN",
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"NTLMSSP_RESERVED10",
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"NTLMSSP_REQUEST_TARGET",
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"NTLMSSP_NEGOTIATE_OEM",
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"NTLMSSP_NEGOTIATE_UNICODE"
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static const char* const AV_PAIRS_STRINGS[] =
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"MsvAvNbComputerName",
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"MsvAvDnsComputerName",
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"MsvAvDnsDomainName",
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* Set NTLMSSP username.
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* @param username username
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void ntlmssp_set_username(NTLMSSP* ntlmssp, char* username)
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freerdp_blob_free(&ntlmssp->username);
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if (username != NULL)
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ntlmssp->username.data = freerdp_uniconv_out(ntlmssp->uniconv, username, (size_t*) &(ntlmssp->username.length));
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* Set NTLMSSP domain name.
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* @param domain domain name
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void ntlmssp_set_domain(NTLMSSP* ntlmssp, char* domain)
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freerdp_blob_free(&ntlmssp->domain);
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ntlmssp->domain.data = freerdp_uniconv_out(ntlmssp->uniconv, domain, (size_t*) &(ntlmssp->domain.length));
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* Set NTLMSSP password.
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* @param password password
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void ntlmssp_set_password(NTLMSSP* ntlmssp, char* password)
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freerdp_blob_free(&ntlmssp->password);
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if (password != NULL)
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ntlmssp->password.data = freerdp_uniconv_out(ntlmssp->uniconv, password, (size_t*) &(ntlmssp->password.length));
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* Set NTLMSSP workstation.
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* @param workstation workstation
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void ntlmssp_set_workstation(NTLMSSP* ntlmssp, char* workstation)
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freerdp_blob_free(&ntlmssp->workstation);
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if (workstation != NULL)
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ntlmssp->workstation.data = freerdp_uniconv_out(ntlmssp->uniconv, workstation, (size_t*) &(ntlmssp->workstation.length));
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* Generate client challenge (8-byte nonce).
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void ntlmssp_generate_client_challenge(NTLMSSP* ntlmssp)
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/* ClientChallenge in computation of LMv2 and NTLMv2 responses */
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crypto_nonce(ntlmssp->client_challenge, 8);
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* Generate KeyExchangeKey (the 128-bit SessionBaseKey).\n
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void ntlmssp_generate_key_exchange_key(NTLMSSP* ntlmssp)
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/* In NTLMv2, KeyExchangeKey is the 128-bit SessionBaseKey */
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memcpy(ntlmssp->key_exchange_key, ntlmssp->session_base_key, 16);
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* Generate RandomSessionKey (16-byte nonce).
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void ntlmssp_generate_random_session_key(NTLMSSP* ntlmssp)
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crypto_nonce(ntlmssp->random_session_key, 16);
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* Generate ExportedSessionKey (the RandomSessionKey, exported)
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void ntlmssp_generate_exported_session_key(NTLMSSP* ntlmssp)
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memcpy(ntlmssp->exported_session_key, ntlmssp->random_session_key, 16);
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* Encrypt RandomSessionKey (RC4-encrypted RandomSessionKey, using KeyExchangeKey as the key).
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void ntlmssp_encrypt_random_session_key(NTLMSSP* ntlmssp)
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/* In NTLMv2, EncryptedRandomSessionKey is the ExportedSessionKey RC4-encrypted with the KeyExchangeKey */
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credssp_rc4k(ntlmssp->key_exchange_key, 16, ntlmssp->random_session_key, ntlmssp->encrypted_random_session_key);
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* Generate timestamp for AUTHENTICATE_MESSAGE.
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void ntlmssp_generate_timestamp(NTLMSSP* ntlmssp)
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credssp_current_time(ntlmssp->timestamp);
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if (ntlmssp->ntlm_v2)
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if (ntlmssp->av_pairs->Timestamp.length == 8)
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memcpy(ntlmssp->av_pairs->Timestamp.value, ntlmssp->timestamp, 8);
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if (ntlmssp->av_pairs->Timestamp.length != 8)
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ntlmssp->av_pairs->Timestamp.length = 8;
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ntlmssp->av_pairs->Timestamp.value = xmalloc(ntlmssp->av_pairs->Timestamp.length);
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memcpy(ntlmssp->av_pairs->Timestamp.value, ntlmssp->timestamp, 8);
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* Generate signing key.\n
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* @param exported_session_key ExportedSessionKey
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* @param sign_magic Sign magic string
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* @param signing_key Destination signing key
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void ntlmssp_generate_signing_key(uint8* exported_session_key, rdpBlob* sign_magic, uint8* signing_key)
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length = 16 + sign_magic->length;
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value = (uint8*) xmalloc(length);
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/* Concatenate ExportedSessionKey with sign magic */
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memcpy(value, exported_session_key, 16);
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memcpy(&value[16], sign_magic->data, sign_magic->length);
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md5 = crypto_md5_init();
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crypto_md5_update(md5, value, length);
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crypto_md5_final(md5, signing_key);
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* Generate client signing key (ClientSigningKey).\n
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void ntlmssp_generate_client_signing_key(NTLMSSP* ntlmssp)
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sign_magic.data = (void*) client_sign_magic;
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sign_magic.length = sizeof(client_sign_magic);
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ntlmssp_generate_signing_key(ntlmssp->exported_session_key, &sign_magic, ntlmssp->client_signing_key);
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* Generate server signing key (ServerSigningKey).\n
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void ntlmssp_generate_server_signing_key(NTLMSSP* ntlmssp)
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sign_magic.data = (void*) server_sign_magic;
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sign_magic.length = sizeof(server_sign_magic);
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ntlmssp_generate_signing_key(ntlmssp->exported_session_key, &sign_magic, ntlmssp->server_signing_key);
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* Generate sealing key.\n
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* @param exported_session_key ExportedSessionKey
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* @param seal_magic Seal magic string
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* @param sealing_key Destination sealing key
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void ntlmssp_generate_sealing_key(uint8* exported_session_key, rdpBlob* seal_magic, uint8* sealing_key)
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freerdp_blob_alloc(&blob, 16 + seal_magic->length);
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p = (uint8*) blob.data;
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/* Concatenate ExportedSessionKey with seal magic */
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memcpy(p, exported_session_key, 16);
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memcpy(&p[16], seal_magic->data, seal_magic->length);
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md5 = crypto_md5_init();
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crypto_md5_update(md5, blob.data, blob.length);
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crypto_md5_final(md5, sealing_key);
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freerdp_blob_free(&blob);
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* Generate client sealing key (ClientSealingKey).\n
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void ntlmssp_generate_client_sealing_key(NTLMSSP* ntlmssp)
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seal_magic.data = (void*) client_seal_magic;
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seal_magic.length = sizeof(client_seal_magic);
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ntlmssp_generate_signing_key(ntlmssp->exported_session_key, &seal_magic, ntlmssp->client_sealing_key);
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* Generate server sealing key (ServerSealingKey).\n
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void ntlmssp_generate_server_sealing_key(NTLMSSP* ntlmssp)
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seal_magic.data = (void*) server_seal_magic;
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seal_magic.length = sizeof(server_seal_magic);
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ntlmssp_generate_signing_key(ntlmssp->exported_session_key, &seal_magic, ntlmssp->server_sealing_key);
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* Initialize RC4 stream cipher states for sealing.
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void ntlmssp_init_rc4_seal_states(NTLMSSP* ntlmssp)
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ntlmssp->send_rc4_seal = crypto_rc4_init(ntlmssp->client_sealing_key, 16);
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ntlmssp->recv_rc4_seal = crypto_rc4_init(ntlmssp->server_sealing_key, 16);
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* Get bit from a byte buffer using a bit offset.
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* @param buffer byte buffer
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* @param bit bit offset
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static int get_bit(char* buffer, int bit)
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return (buffer[(bit - (bit % 8)) / 8] >> (7 - bit % 8) & 1);
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* Set bit in a byte buffer using a bit offset.
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* @param buffer byte buffer
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* @param bit bit offset
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* @param value bit value
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static void set_bit(char* buffer, int bit, int value)
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buffer[(bit - (bit % 8)) / 8] |= value << (7 - bit % 8);
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static void ntlmssp_compute_des_key(char* text, char* des_key)
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/* Convert the 7 bytes into a bit stream, and insert a parity-bit (odd parity) after every seven bits. */
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memset(des_key, '\0', 8);
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for (i = 0; i < 8; i++)
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for (j = 0; j < 7; j++)
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/* copy 7 bits, and count the number of bits that are set */
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bit = get_bit(text, i*7 + j);
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set_bit(des_key, i*7 + i + j, bit);
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/* insert parity bit (odd parity) */
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set_bit(des_key, i*7 + i + j, 1);
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void ntlmssp_compute_lm_hash(char* password, char* hash)
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/* LM("password") = E52CAC67419A9A224A3B108F3FA6CB6D */
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maxlen = (strlen(password) < 14) ? strlen(password) : 14;
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/* convert to uppercase */
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for (i = 0; i < maxlen; i++)
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if ((password[i] >= 'a') && (password[i] <= 'z'))
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text[i] = password[i] - 32;
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text[i] = password[i];
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/* pad with nulls up to 14 bytes */
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for (i = maxlen; i < 14; i++)
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ntlmssp_compute_des_key(text, des_key1);
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ntlmssp_compute_des_key(&text[7], des_key2);
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DES_set_key((const_DES_cblock*)des_key1, &ks);
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DES_ecb_encrypt((const_DES_cblock*) lm_magic, (DES_cblock*)hash, &ks, DES_ENCRYPT);
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DES_set_key((const_DES_cblock*)des_key2, &ks);
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DES_ecb_encrypt((const_DES_cblock*) lm_magic, (DES_cblock*)&hash[8], &ks, DES_ENCRYPT);
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void ntlmssp_compute_ntlm_hash(rdpBlob* password, char* hash)
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/* NTLMv1("password") = 8846F7EAEE8FB117AD06BDD830B7586C */
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/* Password needs to be in unicode */
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/* Apply the MD4 digest algorithm on the password in unicode, the result is the NTLM hash */
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MD4_Update(&md4_ctx, password->data, password->length);
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MD4_Final((void*) hash, &md4_ctx);
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void ntlmssp_compute_ntlm_v2_hash(NTLMSSP* ntlmssp, char* hash)
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freerdp_blob_alloc(&blob, ntlmssp->username.length + ntlmssp->domain.length);
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p = (char*) blob.data;
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/* First, compute the NTLMv1 hash of the password */
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ntlmssp_compute_ntlm_hash(&ntlmssp->password, ntlm_hash);
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/* Concatenate(Uppercase(username),domain)*/
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memcpy(p, ntlmssp->username.data, ntlmssp->username.length);
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freerdp_uniconv_uppercase(ntlmssp->uniconv, p, ntlmssp->username.length / 2);
519
memcpy(&p[ntlmssp->username.length], ntlmssp->domain.data, ntlmssp->domain.length);
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/* Compute the HMAC-MD5 hash of the above value using the NTLMv1 hash as the key, the result is the NTLMv2 hash */
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HMAC(EVP_md5(), (void*) ntlm_hash, 16, blob.data, blob.length, (void*) hash, NULL);
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freerdp_blob_free(&blob);
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void ntlmssp_compute_lm_response(char* password, char* challenge, char* response)
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/* A LM hash is 16-bytes long, but the LM response uses a LM hash null-padded to 21 bytes */
536
memset(hash, '\0', 21);
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ntlmssp_compute_lm_hash(password, hash);
539
/* Each 7-byte third of the 21-byte null-padded LM hash is used to create a DES key */
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ntlmssp_compute_des_key(hash, des_key1);
541
ntlmssp_compute_des_key(&hash[7], des_key2);
542
ntlmssp_compute_des_key(&hash[14], des_key3);
544
/* Encrypt the LM challenge with each key, and concatenate the result. This is the LM response (24 bytes) */
545
DES_set_key((const_DES_cblock*)des_key1, &ks);
546
DES_ecb_encrypt((const_DES_cblock*)challenge, (DES_cblock*)response, &ks, DES_ENCRYPT);
548
DES_set_key((const_DES_cblock*)des_key2, &ks);
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DES_ecb_encrypt((const_DES_cblock*)challenge, (DES_cblock*)&response[8], &ks, DES_ENCRYPT);
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DES_set_key((const_DES_cblock*)des_key3, &ks);
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DES_ecb_encrypt((const_DES_cblock*)challenge, (DES_cblock*)&response[16], &ks, DES_ENCRYPT);
555
void ntlmssp_compute_lm_v2_response(NTLMSSP* ntlmssp)
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char ntlm_v2_hash[16];
561
/* Compute the NTLMv2 hash */
562
ntlmssp_compute_ntlm_v2_hash(ntlmssp, ntlm_v2_hash);
564
/* Concatenate the server and client challenges */
565
memcpy(value, ntlmssp->server_challenge, 8);
566
memcpy(&value[8], ntlmssp->client_challenge, 8);
568
freerdp_blob_alloc(&ntlmssp->lm_challenge_response, 24);
569
response = (char*) ntlmssp->lm_challenge_response.data;
571
/* Compute the HMAC-MD5 hash of the resulting value using the NTLMv2 hash as the key */
572
HMAC(EVP_md5(), (void*) ntlm_v2_hash, 16, (void*) value, 16, (void*) response, NULL);
574
/* Concatenate the resulting HMAC-MD5 hash and the client challenge, giving us the LMv2 response (24 bytes) */
575
memcpy(&response[16], ntlmssp->client_challenge, 8);
579
* Compute NTLMv2 Response.\n
580
* NTLMv2_RESPONSE @msdn{cc236653}\n
581
* NTLMv2 Authentication @msdn{cc236700}
585
void ntlmssp_compute_ntlm_v2_response(NTLMSSP* ntlmssp)
588
uint8 ntlm_v2_hash[16];
589
uint8 nt_proof_str[16];
590
rdpBlob ntlm_v2_temp;
591
rdpBlob ntlm_v2_temp_chal;
593
freerdp_blob_alloc(&ntlm_v2_temp, ntlmssp->target_info.length + 28);
595
memset(ntlm_v2_temp.data, '\0', ntlm_v2_temp.length);
596
blob = (uint8*) ntlm_v2_temp.data;
598
/* Compute the NTLMv2 hash */
599
ntlmssp_compute_ntlm_v2_hash(ntlmssp, (char*) ntlm_v2_hash);
601
#ifdef WITH_DEBUG_NLA
602
printf("Password (length = %d)\n", ntlmssp->password.length);
603
freerdp_hexdump(ntlmssp->password.data, ntlmssp->password.length);
606
printf("Username (length = %d)\n", ntlmssp->username.length);
607
freerdp_hexdump(ntlmssp->username.data, ntlmssp->username.length);
610
printf("Domain (length = %d)\n", ntlmssp->domain.length);
611
freerdp_hexdump(ntlmssp->domain.data, ntlmssp->domain.length);
614
printf("Workstation (length = %d)\n", ntlmssp->workstation.length);
615
freerdp_hexdump(ntlmssp->workstation.data, ntlmssp->workstation.length);
618
printf("NTOWFv2, NTLMv2 Hash\n");
619
freerdp_hexdump(ntlm_v2_hash, 16);
624
blob[0] = 1; /* RespType (1 byte) */
625
blob[1] = 1; /* HighRespType (1 byte) */
626
/* Reserved1 (2 bytes) */
627
/* Reserved2 (4 bytes) */
628
memcpy(&blob[8], ntlmssp->av_pairs->Timestamp.value, 8); /* Timestamp (8 bytes) */
629
memcpy(&blob[16], ntlmssp->client_challenge, 8); /* ClientChallenge (8 bytes) */
630
/* Reserved3 (4 bytes) */
631
memcpy(&blob[28], ntlmssp->target_info.data, ntlmssp->target_info.length);
633
#ifdef WITH_DEBUG_NLA
634
printf("NTLMv2 Response Temp Blob\n");
635
freerdp_hexdump(ntlm_v2_temp.data, ntlm_v2_temp.length);
639
/* Concatenate server challenge with temp */
640
freerdp_blob_alloc(&ntlm_v2_temp_chal, ntlm_v2_temp.length + 8);
641
blob = (uint8*) ntlm_v2_temp_chal.data;
642
memcpy(blob, ntlmssp->server_challenge, 8);
643
memcpy(&blob[8], ntlm_v2_temp.data, ntlm_v2_temp.length);
645
HMAC(EVP_md5(), (void*) ntlm_v2_hash, 16, (void*) ntlm_v2_temp_chal.data,
646
ntlm_v2_temp_chal.length, (void*) nt_proof_str, NULL);
648
/* NtChallengeResponse, Concatenate NTProofStr with temp */
649
freerdp_blob_alloc(&ntlmssp->nt_challenge_response, ntlm_v2_temp.length + 16);
650
blob = (uint8*) ntlmssp->nt_challenge_response.data;
651
memcpy(blob, nt_proof_str, 16);
652
memcpy(&blob[16], ntlm_v2_temp.data, ntlm_v2_temp.length);
654
/* Compute SessionBaseKey, the HMAC-MD5 hash of NTProofStr using the NTLMv2 hash as the key */
655
HMAC(EVP_md5(), (void*) ntlm_v2_hash, 16,
656
(void*) nt_proof_str, 16, (void*) ntlmssp->session_base_key, NULL);
658
freerdp_blob_free(&ntlm_v2_temp);
659
freerdp_blob_free(&ntlm_v2_temp_chal);
663
* Input NegotiateFlags, a 4-byte bit map.
668
void ntlmssp_input_negotiate_flags(STREAM* s, uint32* flags)
671
stream_read_uint32(s, *flags);
675
* Output NegotiateFlags, a 4-byte bit map.
680
void ntlmssp_output_negotiate_flags(STREAM* s, uint32 flags)
682
stream_write_uint32(s, flags);
685
void ntlmssp_print_negotiate_flags(uint32 flags)
690
printf("negotiateFlags \"0x%08X\"{\n", flags);
692
for (i = 31; i >= 0; i--)
694
if ((flags >> i) & 1)
696
str = NTLMSSP_NEGOTIATE_STRINGS[(31 - i)];
697
printf("\t%s (%d),\n", str, (31 - i));
705
* Output Restriction_Encoding.\n
706
* Restriction_Encoding @msdn{cc236647}
710
static void ntlmssp_output_restriction_encoding(NTLMSSP* ntlmssp)
712
AV_PAIR *restrictions = &ntlmssp->av_pairs->Restrictions;
713
STREAM* s = stream_new(0);
715
uint8 machineID[32] =
716
"\x3A\x15\x8E\xA6\x75\x82\xD8\xF7\x3E\x06\xFA\x7A\xB4\xDF\xFD\x43"
717
"\x84\x6C\x02\x3A\xFD\x5A\x94\xFE\xCF\x97\x0F\x3D\x19\x2C\x38\x20";
719
restrictions->value = xmalloc(48);
720
restrictions->length = 48;
722
s->data = restrictions->value;
723
s->size = restrictions->length;
726
stream_write_uint32(s, 48); /* Size */
727
stream_write_zero(s, 4); /* Z4 (set to zero) */
729
/* IntegrityLevel (bit 31 set to 1) */
730
stream_write_uint8(s, 1);
731
stream_write_zero(s, 3);
733
stream_write_uint32(s, 0x00002000); /* SubjectIntegrityLevel */
734
stream_write(s, machineID, 32); /* MachineID */
740
* Output TargetName.\n
744
void ntlmssp_output_target_name(NTLMSSP* ntlmssp)
746
STREAM* s = stream_new(0);
747
AV_PAIR* target_name = &ntlmssp->av_pairs->TargetName;
750
* TODO: No idea what should be set here (observed MsvAvTargetName = MsvAvDnsComputerName or
751
* MsvAvTargetName should be the name of the service be accessed after authentication)
752
* here used: "TERMSRV/192.168.0.123" in unicode (Dmitrij Jasnov)
755
"\x54\x00\x45\x00\x52\x00\x4d\x00\x53\x00\x52\x00\x56\x00\x2f\x00\x31\x00\x39\x00\x32"
756
"\x00\x2e\x00\x31\x00\x36\x00\x38\x00\x2e\x00\x30\x00\x2e\x00\x31\x00\x32\x00\x33\x00";
758
target_name->length = 42;
759
target_name->value = (uint8*) xmalloc(target_name->length);
761
s->data = target_name->value;
762
s->size = target_name->length;
765
stream_write(s, name, target_name->length);
771
* Output ChannelBindings.\n
775
void ntlmssp_output_channel_bindings(NTLMSSP* ntlmssp)
777
STREAM* s = stream_new(0);
778
AV_PAIR* channel_bindings = &ntlmssp->av_pairs->ChannelBindings;
780
channel_bindings->value = (uint8*) xmalloc(48);
781
channel_bindings->length = 16;
783
s->data = channel_bindings->value;
784
s->size = channel_bindings->length;
787
stream_write_zero(s, 16); /* an all-zero value of the hash is used to indicate absence of channel bindings */
793
* Populate array of AV_PAIRs.\n
794
* AV_PAIR @msdn{cc236646}
798
void ntlmssp_populate_av_pairs(NTLMSSP* ntlmssp)
802
AV_PAIRS *av_pairs = ntlmssp->av_pairs;
805
av_pairs->Flags = 0x00000002; /* Indicates the present of a Message Integrity Check (MIC) */
807
/* Restriction_Encoding */
808
ntlmssp_output_restriction_encoding(ntlmssp);
811
ntlmssp_output_target_name(ntlmssp);
813
/* ChannelBindings */
814
ntlmssp_output_channel_bindings(ntlmssp);
817
s->data = xmalloc(ntlmssp->target_info.length + 512);
820
ntlmssp_output_av_pairs(ntlmssp, s);
821
freerdp_blob_alloc(&target_info, s->p - s->data);
822
memcpy(target_info.data, s->data, target_info.length);
824
ntlmssp->target_info.data = target_info.data;
825
ntlmssp->target_info.length = target_info.length;
829
* Input array of AV_PAIRs.\n
830
* AV_PAIR @msdn{cc236646}
835
void ntlmssp_input_av_pairs(NTLMSSP* ntlmssp, STREAM* s)
840
AV_PAIRS* av_pairs = ntlmssp->av_pairs;
842
#ifdef WITH_DEBUG_NLA
843
printf("AV_PAIRS = {\n");
849
stream_read_uint16(s, AvId);
850
stream_read_uint16(s, AvLen);
854
if (AvId != MsvAvFlags)
856
value = xmalloc(AvLen);
857
stream_read(s, value, AvLen);
861
stream_read_uint32(s, av_pairs->Flags);
867
case MsvAvNbComputerName:
868
av_pairs->NbComputerName.length = AvLen;
869
av_pairs->NbComputerName.value = value;
872
case MsvAvNbDomainName:
873
av_pairs->NbDomainName.length = AvLen;
874
av_pairs->NbDomainName.value = value;
877
case MsvAvDnsComputerName:
878
av_pairs->DnsComputerName.length = AvLen;
879
av_pairs->DnsComputerName.value = value;
882
case MsvAvDnsDomainName:
883
av_pairs->DnsDomainName.length = AvLen;
884
av_pairs->DnsDomainName.value = value;
887
case MsvAvDnsTreeName:
888
av_pairs->DnsTreeName.length = AvLen;
889
av_pairs->DnsTreeName.value = value;
893
av_pairs->Timestamp.length = AvLen;
894
av_pairs->Timestamp.value = value;
897
case MsvAvRestrictions:
898
av_pairs->Restrictions.length = AvLen;
899
av_pairs->Restrictions.value = value;
902
case MsvAvTargetName:
903
av_pairs->TargetName.length = AvLen;
904
av_pairs->TargetName.value = value;
907
case MsvChannelBindings:
908
av_pairs->ChannelBindings.length = AvLen;
909
av_pairs->ChannelBindings.value = value;
918
#ifdef WITH_DEBUG_NLA
920
printf("\tAvId: %s, AvLen: %d\n", AV_PAIRS_STRINGS[AvId], AvLen);
922
printf("\tAvId: %s, AvLen: %d\n", "Unknown", AvLen);
924
freerdp_hexdump(value, AvLen);
927
while (AvId != MsvAvEOL);
929
#ifdef WITH_DEBUG_NLA
935
* Output array of AV_PAIRs.\n
936
* AV_PAIR @msdn{cc236646}
941
void ntlmssp_output_av_pairs(NTLMSSP* ntlmssp, STREAM* s)
943
AV_PAIRS* av_pairs = ntlmssp->av_pairs;
945
if (av_pairs->NbDomainName.length > 0)
947
stream_write_uint16(s, MsvAvNbDomainName); /* AvId */
948
stream_write_uint16(s, av_pairs->NbDomainName.length); /* AvLen */
949
stream_write(s, av_pairs->NbDomainName.value, av_pairs->NbDomainName.length); /* Value */
952
if (av_pairs->NbComputerName.length > 0)
954
stream_write_uint16(s, MsvAvNbComputerName); /* AvId */
955
stream_write_uint16(s, av_pairs->NbComputerName.length); /* AvLen */
956
stream_write(s, av_pairs->NbComputerName.value, av_pairs->NbComputerName.length); /* Value */
959
if (av_pairs->DnsDomainName.length > 0)
961
stream_write_uint16(s, MsvAvDnsDomainName); /* AvId */
962
stream_write_uint16(s, av_pairs->DnsDomainName.length); /* AvLen */
963
stream_write(s, av_pairs->DnsDomainName.value, av_pairs->DnsDomainName.length); /* Value */
966
if (av_pairs->DnsComputerName.length > 0)
968
stream_write_uint16(s, MsvAvDnsComputerName); /* AvId */
969
stream_write_uint16(s, av_pairs->DnsComputerName.length); /* AvLen */
970
stream_write(s, av_pairs->DnsComputerName.value, av_pairs->DnsComputerName.length); /* Value */
973
if (av_pairs->DnsTreeName.length > 0)
975
stream_write_uint16(s, MsvAvDnsTreeName); /* AvId */
976
stream_write_uint16(s, av_pairs->DnsTreeName.length); /* AvLen */
977
stream_write(s, av_pairs->DnsTreeName.value, av_pairs->DnsTreeName.length); /* Value */
980
if (av_pairs->Timestamp.length > 0)
982
stream_write_uint16(s, MsvAvTimestamp); /* AvId */
983
stream_write_uint16(s, av_pairs->Timestamp.length); /* AvLen */
984
stream_write(s, av_pairs->Timestamp.value, av_pairs->Timestamp.length); /* Value */
987
if (av_pairs->Flags > 0)
989
stream_write_uint16(s, MsvAvFlags); /* AvId */
990
stream_write_uint16(s, 4); /* AvLen */
991
stream_write_uint32(s, av_pairs->Flags); /* Value */
994
if (av_pairs->Restrictions.length > 0)
996
stream_write_uint16(s, MsvAvRestrictions); /* AvId */
997
stream_write_uint16(s, av_pairs->Restrictions.length); /* AvLen */
998
stream_write(s, av_pairs->Restrictions.value, av_pairs->Restrictions.length); /* Value */
1001
if (av_pairs->ChannelBindings.length > 0)
1003
stream_write_uint16(s, MsvChannelBindings); /* AvId */
1004
stream_write_uint16(s, av_pairs->ChannelBindings.length); /* AvLen */
1005
stream_write(s, av_pairs->ChannelBindings.value, av_pairs->ChannelBindings.length); /* Value */
1008
if (av_pairs->TargetName.length > 0)
1010
stream_write_uint16(s, MsvAvTargetName); /* AvId */
1011
stream_write_uint16(s, av_pairs->TargetName.length); /* AvLen */
1012
stream_write(s, av_pairs->TargetName.value, av_pairs->TargetName.length); /* Value */
1015
/* This indicates the end of the AV_PAIR array */
1016
stream_write_uint16(s, MsvAvEOL); /* AvId */
1017
stream_write_uint16(s, 0); /* AvLen */
1019
if (ntlmssp->ntlm_v2)
1021
stream_write_zero(s, 8);
1026
* Print array of AV_PAIRs.\n
1027
* AV_PAIR @msdn{cc236646}
1032
void ntlmssp_print_av_pairs(NTLMSSP* ntlmssp)
1034
AV_PAIRS* av_pairs = ntlmssp->av_pairs;
1036
printf("AV_PAIRS = {\n");
1038
if (av_pairs->NbDomainName.length > 0)
1040
printf("\tAvId: MsvAvNbDomainName AvLen: %d\n", av_pairs->NbDomainName.length);
1041
freerdp_hexdump(av_pairs->NbDomainName.value, av_pairs->NbDomainName.length);
1044
if (av_pairs->NbComputerName.length > 0)
1046
printf("\tAvId: MsvAvNbComputerName AvLen: %d\n", av_pairs->NbComputerName.length);
1047
freerdp_hexdump(av_pairs->NbComputerName.value, av_pairs->NbComputerName.length);
1050
if (av_pairs->DnsDomainName.length > 0)
1052
printf("\tAvId: MsvAvDnsDomainName AvLen: %d\n", av_pairs->DnsDomainName.length);
1053
freerdp_hexdump(av_pairs->DnsDomainName.value, av_pairs->DnsDomainName.length);
1056
if (av_pairs->DnsComputerName.length > 0)
1058
printf("\tAvId: MsvAvDnsComputerName AvLen: %d\n", av_pairs->DnsComputerName.length);
1059
freerdp_hexdump(av_pairs->DnsComputerName.value, av_pairs->DnsComputerName.length);
1062
if (av_pairs->DnsTreeName.length > 0)
1064
printf("\tAvId: MsvAvDnsTreeName AvLen: %d\n", av_pairs->DnsTreeName.length);
1065
freerdp_hexdump(av_pairs->DnsTreeName.value, av_pairs->DnsTreeName.length);
1068
if (av_pairs->Timestamp.length > 0)
1070
printf("\tAvId: MsvAvTimestamp AvLen: %d\n", av_pairs->Timestamp.length);
1071
freerdp_hexdump(av_pairs->Timestamp.value, av_pairs->Timestamp.length);
1074
if (av_pairs->Flags > 0)
1076
printf("\tAvId: MsvAvFlags AvLen: %d\n", 4);
1077
printf("0x%08X\n", av_pairs->Flags);
1080
if (av_pairs->Restrictions.length > 0)
1082
printf("\tAvId: MsvAvRestrictions AvLen: %d\n", av_pairs->Restrictions.length);
1083
freerdp_hexdump(av_pairs->Restrictions.value, av_pairs->Restrictions.length);
1086
if (av_pairs->ChannelBindings.length > 0)
1088
printf("\tAvId: MsvChannelBindings AvLen: %d\n", av_pairs->ChannelBindings.length);
1089
freerdp_hexdump(av_pairs->ChannelBindings.value, av_pairs->ChannelBindings.length);
1092
if (av_pairs->TargetName.length > 0)
1094
printf("\tAvId: MsvAvTargetName AvLen: %d\n", av_pairs->TargetName.length);
1095
freerdp_hexdump(av_pairs->TargetName.value, av_pairs->TargetName.length);
1102
* Free array of AV_PAIRs.\n
1103
* AV_PAIR @msdn{cc236646}
1107
void ntlmssp_free_av_pairs(NTLMSSP* ntlmssp)
1109
AV_PAIRS *av_pairs = ntlmssp->av_pairs;
1111
if (av_pairs != NULL)
1113
if (av_pairs->NbComputerName.value != NULL)
1114
xfree(av_pairs->NbComputerName.value);
1115
if (av_pairs->NbDomainName.value != NULL)
1116
xfree(av_pairs->NbDomainName.value);
1117
if (av_pairs->DnsComputerName.value != NULL)
1118
xfree(av_pairs->DnsComputerName.value);
1119
if (av_pairs->DnsDomainName.value != NULL)
1120
xfree(av_pairs->DnsDomainName.value);
1121
if (av_pairs->DnsTreeName.value != NULL)
1122
xfree(av_pairs->DnsTreeName.value);
1123
if (av_pairs->Timestamp.value != NULL)
1124
xfree(av_pairs->Timestamp.value);
1125
if (av_pairs->Restrictions.value != NULL)
1126
xfree(av_pairs->Restrictions.value);
1127
if (av_pairs->TargetName.value != NULL)
1128
xfree(av_pairs->TargetName.value);
1129
if (av_pairs->ChannelBindings.value != NULL)
1130
xfree(av_pairs->ChannelBindings.value);
1135
ntlmssp->av_pairs = NULL;
1139
* Output VERSION structure.\n
1140
* VERSION @msdn{cc236654}
1144
static void ntlmssp_output_version(STREAM* s)
1146
/* The following version information was observed with Windows 7 */
1148
stream_write_uint8(s, WINDOWS_MAJOR_VERSION_6); /* ProductMajorVersion (1 byte) */
1149
stream_write_uint8(s, WINDOWS_MINOR_VERSION_1); /* ProductMinorVersion (1 byte) */
1150
stream_write_uint16(s, 7600); /* ProductBuild (2 bytes) */
1151
stream_write_zero(s, 3); /* Reserved (3 bytes) */
1152
stream_write_uint8(s, NTLMSSP_REVISION_W2K3); /* NTLMRevisionCurrent (1 byte) */
1155
void ntlmssp_compute_message_integrity_check(NTLMSSP* ntlmssp)
1160
* Compute the HMAC-MD5 hash of ConcatenationOf(NEGOTIATE_MESSAGE,
1161
* CHALLENGE_MESSAGE, AUTHENTICATE_MESSAGE) using the ExportedSessionKey
1164
HMAC_CTX_init(&hmac_ctx);
1165
HMAC_Init_ex(&hmac_ctx, ntlmssp->exported_session_key, 16, EVP_md5(), NULL);
1166
HMAC_Update(&hmac_ctx, ntlmssp->negotiate_message.data, ntlmssp->negotiate_message.length);
1167
HMAC_Update(&hmac_ctx, ntlmssp->challenge_message.data, ntlmssp->challenge_message.length);
1168
HMAC_Update(&hmac_ctx, ntlmssp->authenticate_message.data, ntlmssp->authenticate_message.length);
1169
HMAC_Final(&hmac_ctx, ntlmssp->message_integrity_check, NULL);
1173
* Encrypt and sign message using NTLMSSP.\n
1174
* GSS_WrapEx() @msdn{cc236718}\n
1175
* EncryptMessage() @msdn{aa375378}
1177
* @param[in] msg message to encrypt
1178
* @param[out] encrypted_msg encrypted message
1179
* @param[out] signature destination signature
1182
void ntlmssp_encrypt_message(NTLMSSP* ntlmssp, rdpBlob* msg, rdpBlob* encrypted_msg, uint8* signature)
1189
/* Compute the HMAC-MD5 hash of ConcatenationOf(seq_num,msg) using the client signing key */
1190
HMAC_CTX_init(&hmac_ctx);
1191
HMAC_Init_ex(&hmac_ctx, ntlmssp->client_signing_key, 16, EVP_md5(), NULL);
1192
HMAC_Update(&hmac_ctx, (void*) &ntlmssp->send_seq_num, 4);
1193
HMAC_Update(&hmac_ctx, msg->data, msg->length);
1194
HMAC_Final(&hmac_ctx, digest, NULL);
1196
/* Allocate space for encrypted message */
1197
freerdp_blob_alloc(encrypted_msg, msg->length);
1199
/* Encrypt message using with RC4 */
1200
crypto_rc4(ntlmssp->send_rc4_seal, msg->length, msg->data, encrypted_msg->data);
1202
/* RC4-encrypt first 8 bytes of digest */
1203
crypto_rc4(ntlmssp->send_rc4_seal, 8, digest, checksum);
1205
/* Concatenate version, ciphertext and sequence number to build signature */
1206
memcpy(signature, (void*) &version, 4);
1207
memcpy(&signature[4], (void*) checksum, 8);
1208
memcpy(&signature[12], (void*) &(ntlmssp->send_seq_num), 4);
1210
HMAC_CTX_cleanup(&hmac_ctx);
1212
ntlmssp->send_seq_num++;
1216
* Decrypt message and verify signature using NTLMSSP.\n
1217
* GSS_UnwrapEx() @msdn{cc236703}\n
1218
* DecryptMessage() @msdn{aa375211}
1220
* @param[in] encrypted_msg encrypted message
1221
* @param[out] msg decrypted message
1222
* @param[in] signature signature
1226
int ntlmssp_decrypt_message(NTLMSSP* ntlmssp, rdpBlob* encrypted_msg, rdpBlob* msg, uint8* signature)
1232
uint8 expected_signature[16];
1234
/* Allocate space for encrypted message */
1235
freerdp_blob_alloc(msg, encrypted_msg->length);
1237
/* Encrypt message using with RC4 */
1238
crypto_rc4(ntlmssp->recv_rc4_seal, encrypted_msg->length, encrypted_msg->data, msg->data);
1240
/* Compute the HMAC-MD5 hash of ConcatenationOf(seq_num,msg) using the client signing key */
1241
HMAC_CTX_init(&hmac_ctx);
1242
HMAC_Init_ex(&hmac_ctx, ntlmssp->server_signing_key, 16, EVP_md5(), NULL);
1243
HMAC_Update(&hmac_ctx, (void*) &ntlmssp->recv_seq_num, 4);
1244
HMAC_Update(&hmac_ctx, msg->data, msg->length);
1245
HMAC_Final(&hmac_ctx, digest, NULL);
1247
/* RC4-encrypt first 8 bytes of digest */
1248
crypto_rc4(ntlmssp->recv_rc4_seal, 8, digest, checksum);
1250
/* Concatenate version, ciphertext and sequence number to build signature */
1251
memcpy(expected_signature, (void*) &version, 4);
1252
memcpy(&expected_signature[4], (void*) checksum, 8);
1253
memcpy(&expected_signature[12], (void*) &(ntlmssp->recv_seq_num), 4);
1255
if (memcmp(signature, expected_signature, 16) != 0)
1257
/* signature verification failed! */
1258
printf("signature verification failed, something nasty is going on!\n");
1262
HMAC_CTX_cleanup(&hmac_ctx);
1264
ntlmssp->recv_seq_num++;
1269
* Send NTLMSSP NEGOTIATE_MESSAGE.\n
1270
* NEGOTIATE_MESSAGE @msdn{cc236641}
1275
void ntlmssp_send_negotiate_message(NTLMSSP* ntlmssp, STREAM* s)
1278
uint32 negotiateFlags = 0;
1280
stream_write(s, ntlm_signature, 8); /* Signature (8 bytes) */
1281
stream_write_uint32(s, 1); /* MessageType */
1283
if (ntlmssp->ntlm_v2)
1285
DEBUG_NLA("Negotiating NTLMv2");
1286
/* observed: B7 82 08 E2 (0xE20882B7) (Dmitrij Jasnov) */
1287
negotiateFlags |= NTLMSSP_NEGOTIATE_56;
1288
negotiateFlags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
1289
negotiateFlags |= NTLMSSP_NEGOTIATE_128;
1290
negotiateFlags |= NTLMSSP_NEGOTIATE_VERSION;
1291
negotiateFlags |= NTLMSSP_NEGOTIATE_EXTENDED_SESSION_SECURITY;
1292
negotiateFlags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
1293
negotiateFlags |= NTLMSSP_NEGOTIATE_NTLM;
1294
negotiateFlags |= NTLMSSP_NEGOTIATE_LM_KEY;
1295
negotiateFlags |= NTLMSSP_NEGOTIATE_SEAL;
1296
negotiateFlags |= NTLMSSP_NEGOTIATE_SIGN;
1297
negotiateFlags |= NTLMSSP_REQUEST_TARGET;
1298
negotiateFlags |= NTLMSSP_NEGOTIATE_OEM;
1299
negotiateFlags |= NTLMSSP_NEGOTIATE_UNICODE;
1303
negotiateFlags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
1304
negotiateFlags |= NTLMSSP_NEGOTIATE_128;
1305
negotiateFlags |= NTLMSSP_NEGOTIATE_EXTENDED_SESSION_SECURITY;
1306
negotiateFlags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
1307
negotiateFlags |= NTLMSSP_NEGOTIATE_NTLM;
1308
negotiateFlags |= NTLMSSP_NEGOTIATE_SEAL;
1309
negotiateFlags |= NTLMSSP_NEGOTIATE_SIGN;
1310
negotiateFlags |= NTLMSSP_REQUEST_TARGET;
1311
negotiateFlags |= NTLMSSP_NEGOTIATE_UNICODE;
1314
ntlmssp_output_negotiate_flags(s, negotiateFlags); /* NegotiateFlags (4 bytes) */
1316
#ifdef WITH_DEBUG_NLA
1317
ntlmssp_print_negotiate_flags(negotiateFlags);
1320
/* only set if NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED is set */
1322
/* DomainNameFields (8 bytes) */
1323
stream_write_uint16(s, 0); /* DomainNameLen */
1324
stream_write_uint16(s, 0); /* DomainNameMaxLen */
1325
stream_write_uint32(s, 0); /* DomainNameBufferOffset */
1327
/* only set if NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED is set */
1329
/* WorkstationFields (8 bytes) */
1330
stream_write_uint16(s, 0); /* WorkstationLen */
1331
stream_write_uint16(s, 0); /* WorkstationMaxLen */
1332
stream_write_uint32(s, 0); /* WorkstationBufferOffset */
1334
if (negotiateFlags & NTLMSSP_NEGOTIATE_VERSION)
1336
/* Only present if NTLMSSP_NEGOTIATE_VERSION is set */
1337
ntlmssp_output_version(s);
1339
#ifdef WITH_DEBUG_NLA
1340
printf("Version (length = 8)\n");
1341
freerdp_hexdump((s->p - 8), 8);
1346
length = s->p - s->data;
1347
freerdp_blob_alloc(&ntlmssp->negotiate_message, length);
1348
memcpy(ntlmssp->negotiate_message.data, s->data, length);
1350
#ifdef WITH_DEBUG_NLA
1351
printf("NEGOTIATE_MESSAGE (length = %d)\n", length);
1352
freerdp_hexdump(s->data, length);
1356
ntlmssp->state = NTLMSSP_STATE_CHALLENGE;
1360
* Receive NTLMSSP CHALLENGE_MESSAGE.\n
1361
* CHALLENGE_MESSAGE @msdn{cc236642}
1366
void ntlmssp_recv_challenge_message(NTLMSSP* ntlmssp, STREAM* s)
1370
uint8* start_offset;
1371
uint8* payload_offset;
1372
uint16 targetNameLen;
1373
uint16 targetNameMaxLen;
1374
uint32 targetNameBufferOffset;
1375
uint16 targetInfoLen;
1376
uint16 targetInfoMaxLen;
1377
uint32 targetInfoBufferOffset;
1379
start_offset = s->p - 12;
1381
/* TargetNameFields (8 bytes) */
1382
stream_read_uint16(s, targetNameLen); /* TargetNameLen (2 bytes) */
1383
stream_read_uint16(s, targetNameMaxLen); /* TargetNameMaxLen (2 bytes) */
1384
stream_read_uint32(s, targetNameBufferOffset); /* TargetNameBufferOffset (4 bytes) */
1386
ntlmssp_input_negotiate_flags(s, &(ntlmssp->negotiate_flags)); /* NegotiateFlags (4 bytes) */
1388
#ifdef WITH_DEBUG_NLA
1389
ntlmssp_print_negotiate_flags(ntlmssp->negotiate_flags);
1392
stream_read(s, ntlmssp->server_challenge, 8); /* ServerChallenge (8 bytes) */
1393
stream_seek(s, 8); /* Reserved (8 bytes), should be ignored */
1395
/* TargetInfoFields (8 bytes) */
1396
stream_read_uint16(s, targetInfoLen); /* TargetInfoLen (2 bytes) */
1397
stream_read_uint16(s, targetInfoMaxLen); /* TargetInfoMaxLen (2 bytes) */
1398
stream_read_uint32(s, targetInfoBufferOffset); /* TargetInfoBufferOffset (4 bytes) */
1400
/* only present if NTLMSSP_NEGOTIATE_VERSION is set */
1402
if (ntlmssp->negotiate_flags & NTLMSSP_NEGOTIATE_VERSION)
1404
stream_seek(s, 8); /* Version (8 bytes), can be ignored */
1407
/* Payload (variable) */
1408
payload_offset = s->p;
1410
if (targetNameLen > 0)
1412
p = start_offset + targetNameBufferOffset;
1413
freerdp_blob_alloc(&ntlmssp->target_name, targetNameLen);
1414
memcpy(ntlmssp->target_name.data, p, targetNameLen);
1416
#ifdef WITH_DEBUG_NLA
1417
printf("targetName (length = %d, offset = %d)\n", targetNameLen, targetNameBufferOffset);
1418
freerdp_hexdump(ntlmssp->target_name.data, ntlmssp->target_name.length);
1423
if (targetInfoLen > 0)
1425
p = start_offset + targetInfoBufferOffset;
1426
freerdp_blob_alloc(&ntlmssp->target_info, targetInfoLen);
1427
memcpy(ntlmssp->target_info.data, p, targetInfoLen);
1429
#ifdef WITH_DEBUG_NLA
1430
printf("targetInfo (length = %d, offset = %d)\n", targetInfoLen, targetInfoBufferOffset);
1431
freerdp_hexdump(ntlmssp->target_info.data, ntlmssp->target_info.length);
1435
if (ntlmssp->ntlm_v2)
1438
ntlmssp_input_av_pairs(ntlmssp, s);
1442
length = (payload_offset - start_offset) + targetNameLen + targetInfoLen;
1444
freerdp_blob_alloc(&ntlmssp->challenge_message, length);
1445
memcpy(ntlmssp->challenge_message.data, start_offset, length);
1447
#ifdef WITH_DEBUG_NLA
1448
printf("CHALLENGE_MESSAGE (length = %d)\n", length);
1449
freerdp_hexdump(start_offset, length);
1454
if (ntlmssp->ntlm_v2)
1455
ntlmssp_populate_av_pairs(ntlmssp);
1458
ntlmssp_generate_timestamp(ntlmssp);
1460
/* LmChallengeResponse */
1461
ntlmssp_compute_lm_v2_response(ntlmssp);
1463
if (ntlmssp->ntlm_v2)
1464
memset(ntlmssp->lm_challenge_response.data, '\0', 24);
1466
/* NtChallengeResponse */
1467
ntlmssp_compute_ntlm_v2_response(ntlmssp);
1469
/* KeyExchangeKey */
1470
ntlmssp_generate_key_exchange_key(ntlmssp);
1472
/* EncryptedRandomSessionKey */
1473
ntlmssp_encrypt_random_session_key(ntlmssp);
1475
/* Generate signing keys */
1476
ntlmssp_generate_client_signing_key(ntlmssp);
1477
ntlmssp_generate_server_signing_key(ntlmssp);
1479
/* Generate sealing keys */
1480
ntlmssp_generate_client_sealing_key(ntlmssp);
1481
ntlmssp_generate_server_sealing_key(ntlmssp);
1483
/* Initialize RC4 seal state using client sealing key */
1484
ntlmssp_init_rc4_seal_states(ntlmssp);
1486
#ifdef WITH_DEBUG_NLA
1487
printf("ClientChallenge\n");
1488
freerdp_hexdump(ntlmssp->client_challenge, 8);
1491
printf("ServerChallenge\n");
1492
freerdp_hexdump(ntlmssp->server_challenge, 8);
1495
printf("SessionBaseKey\n");
1496
freerdp_hexdump(ntlmssp->session_base_key, 16);
1499
printf("KeyExchangeKey\n");
1500
freerdp_hexdump(ntlmssp->key_exchange_key, 16);
1503
printf("ExportedSessionKey\n");
1504
freerdp_hexdump(ntlmssp->exported_session_key, 16);
1507
printf("RandomSessionKey\n");
1508
freerdp_hexdump(ntlmssp->random_session_key, 16);
1511
printf("ClientSignKey\n");
1512
freerdp_hexdump(ntlmssp->client_signing_key, 16);
1515
printf("ClientSealingKey\n");
1516
freerdp_hexdump(ntlmssp->client_sealing_key, 16);
1519
printf("Timestamp\n");
1520
freerdp_hexdump(ntlmssp->timestamp, 8);
1524
ntlmssp->state = NTLMSSP_STATE_AUTHENTICATE;
1528
* Send NTLMSSP AUTHENTICATE_MESSAGE.\n
1529
* AUTHENTICATE_MESSAGE @msdn{cc236643}
1534
void ntlmssp_send_authenticate_message(NTLMSSP* ntlmssp, STREAM* s)
1537
uint32 negotiateFlags = 0;
1538
uint8* mic_offset = NULL;
1540
uint16 DomainNameLen;
1542
uint16 WorkstationLen;
1543
uint16 LmChallengeResponseLen;
1544
uint16 NtChallengeResponseLen;
1545
uint16 EncryptedRandomSessionKeyLen;
1547
uint32 PayloadBufferOffset;
1548
uint32 DomainNameBufferOffset;
1549
uint32 UserNameBufferOffset;
1550
uint32 WorkstationBufferOffset;
1551
uint32 LmChallengeResponseBufferOffset;
1552
uint32 NtChallengeResponseBufferOffset;
1553
uint32 EncryptedRandomSessionKeyBufferOffset;
1555
uint8* UserNameBuffer;
1556
uint8* DomainNameBuffer;
1557
uint8* WorkstationBuffer;
1558
uint8* EncryptedRandomSessionKeyBuffer;
1560
WorkstationLen = ntlmssp->workstation.length;
1561
WorkstationBuffer = ntlmssp->workstation.data;
1563
if (ntlmssp->ntlm_v2 < 1)
1566
DomainNameLen = ntlmssp->domain.length;
1567
DomainNameBuffer = ntlmssp->domain.data;
1569
UserNameLen = ntlmssp->username.length;
1570
UserNameBuffer = ntlmssp->username.data;
1572
LmChallengeResponseLen = ntlmssp->lm_challenge_response.length;
1573
NtChallengeResponseLen = ntlmssp->nt_challenge_response.length;
1575
EncryptedRandomSessionKeyLen = 16;
1576
EncryptedRandomSessionKeyBuffer = ntlmssp->encrypted_random_session_key;
1578
if (ntlmssp->ntlm_v2)
1580
/* observed: 35 82 88 e2 (0xE2888235) */
1581
negotiateFlags |= NTLMSSP_NEGOTIATE_56;
1582
negotiateFlags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
1583
negotiateFlags |= NTLMSSP_NEGOTIATE_128;
1584
negotiateFlags |= NTLMSSP_NEGOTIATE_VERSION;
1585
negotiateFlags |= NTLMSSP_NEGOTIATE_TARGET_INFO;
1586
negotiateFlags |= NTLMSSP_NEGOTIATE_EXTENDED_SESSION_SECURITY;
1587
negotiateFlags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
1588
negotiateFlags |= NTLMSSP_NEGOTIATE_NTLM;
1589
negotiateFlags |= NTLMSSP_NEGOTIATE_SEAL;
1590
negotiateFlags |= NTLMSSP_NEGOTIATE_SIGN;
1591
negotiateFlags |= NTLMSSP_REQUEST_TARGET;
1592
negotiateFlags |= NTLMSSP_NEGOTIATE_UNICODE;
1596
negotiateFlags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
1597
negotiateFlags |= NTLMSSP_NEGOTIATE_128;
1598
negotiateFlags |= NTLMSSP_NEGOTIATE_EXTENDED_SESSION_SECURITY;
1599
negotiateFlags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
1600
negotiateFlags |= NTLMSSP_NEGOTIATE_NTLM;
1601
negotiateFlags |= NTLMSSP_NEGOTIATE_SEAL;
1602
negotiateFlags |= NTLMSSP_NEGOTIATE_SIGN;
1603
negotiateFlags |= NTLMSSP_REQUEST_TARGET;
1604
negotiateFlags |= NTLMSSP_NEGOTIATE_UNICODE;
1607
if (ntlmssp->ntlm_v2)
1608
PayloadBufferOffset = 80; /* starting buffer offset */
1610
PayloadBufferOffset = 64; /* starting buffer offset */
1612
if (negotiateFlags & NTLMSSP_NEGOTIATE_VERSION)
1613
PayloadBufferOffset += 8;
1615
DomainNameBufferOffset = PayloadBufferOffset;
1616
UserNameBufferOffset = DomainNameBufferOffset + DomainNameLen;
1617
WorkstationBufferOffset = UserNameBufferOffset + UserNameLen;
1618
LmChallengeResponseBufferOffset = WorkstationBufferOffset + WorkstationLen;
1619
NtChallengeResponseBufferOffset = LmChallengeResponseBufferOffset + LmChallengeResponseLen;
1620
EncryptedRandomSessionKeyBufferOffset = NtChallengeResponseBufferOffset + NtChallengeResponseLen;
1622
stream_write(s, ntlm_signature, 8); /* Signature (8 bytes) */
1623
stream_write_uint32(s, 3); /* MessageType */
1625
/* LmChallengeResponseFields (8 bytes) */
1626
stream_write_uint16(s, LmChallengeResponseLen); /* LmChallengeResponseLen */
1627
stream_write_uint16(s, LmChallengeResponseLen); /* LmChallengeResponseMaxLen */
1628
stream_write_uint32(s, LmChallengeResponseBufferOffset); /* LmChallengeResponseBufferOffset */
1630
/* NtChallengeResponseFields (8 bytes) */
1631
stream_write_uint16(s, NtChallengeResponseLen); /* NtChallengeResponseLen */
1632
stream_write_uint16(s, NtChallengeResponseLen); /* NtChallengeResponseMaxLen */
1633
stream_write_uint32(s, NtChallengeResponseBufferOffset); /* NtChallengeResponseBufferOffset */
1635
/* only set if NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED is set */
1637
/* DomainNameFields (8 bytes) */
1638
stream_write_uint16(s, DomainNameLen); /* DomainNameLen */
1639
stream_write_uint16(s, DomainNameLen); /* DomainNameMaxLen */
1640
stream_write_uint32(s, DomainNameBufferOffset); /* DomainNameBufferOffset */
1642
/* UserNameFields (8 bytes) */
1643
stream_write_uint16(s, UserNameLen); /* UserNameLen */
1644
stream_write_uint16(s, UserNameLen); /* UserNameMaxLen */
1645
stream_write_uint32(s, UserNameBufferOffset); /* UserNameBufferOffset */
1647
/* only set if NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED is set */
1649
/* WorkstationFields (8 bytes) */
1650
stream_write_uint16(s, WorkstationLen); /* WorkstationLen */
1651
stream_write_uint16(s, WorkstationLen); /* WorkstationMaxLen */
1652
stream_write_uint32(s, WorkstationBufferOffset); /* WorkstationBufferOffset */
1654
/* EncryptedRandomSessionKeyFields (8 bytes) */
1655
stream_write_uint16(s, EncryptedRandomSessionKeyLen); /* EncryptedRandomSessionKeyLen */
1656
stream_write_uint16(s, EncryptedRandomSessionKeyLen); /* EncryptedRandomSessionKeyMaxLen */
1657
stream_write_uint32(s, EncryptedRandomSessionKeyBufferOffset); /* EncryptedRandomSessionKeyBufferOffset */
1659
ntlmssp_output_negotiate_flags(s, negotiateFlags); /* NegotiateFlags (4 bytes) */
1661
#ifdef WITH_DEBUG_NLA
1662
ntlmssp_print_negotiate_flags(negotiateFlags);
1665
if (negotiateFlags & NTLMSSP_NEGOTIATE_VERSION)
1667
/* Only present if NTLMSSP_NEGOTIATE_VERSION is set */
1668
ntlmssp_output_version(s);
1670
#ifdef WITH_DEBUG_NLA
1671
printf("Version (length = 8)\n");
1672
freerdp_hexdump((s->p - 8), 8);
1677
if (ntlmssp->ntlm_v2)
1679
/* Message Integrity Check */
1681
stream_write_zero(s, 16);
1685
if (DomainNameLen > 0)
1687
stream_write(s, DomainNameBuffer, DomainNameLen);
1688
#ifdef WITH_DEBUG_NLA
1689
printf("DomainName (length = %d, offset = %d)\n", DomainNameLen, DomainNameBufferOffset);
1690
freerdp_hexdump(DomainNameBuffer, DomainNameLen);
1696
stream_write(s, UserNameBuffer, UserNameLen);
1698
#ifdef WITH_DEBUG_NLA
1699
printf("UserName (length = %d, offset = %d)\n", UserNameLen, UserNameBufferOffset);
1700
freerdp_hexdump(UserNameBuffer, UserNameLen);
1705
if (WorkstationLen > 0)
1707
stream_write(s, WorkstationBuffer, WorkstationLen);
1708
#ifdef WITH_DEBUG_NLA
1709
printf("Workstation (length = %d, offset = %d)\n", WorkstationLen, WorkstationBufferOffset);
1710
freerdp_hexdump(WorkstationBuffer, WorkstationLen);
1715
/* LmChallengeResponse */
1716
stream_write(s, ntlmssp->lm_challenge_response.data, LmChallengeResponseLen);
1718
#ifdef WITH_DEBUG_NLA
1719
printf("LmChallengeResponse (length = %d, offset = %d)\n", LmChallengeResponseLen, LmChallengeResponseBufferOffset);
1720
freerdp_hexdump(ntlmssp->lm_challenge_response.data, LmChallengeResponseLen);
1724
/* NtChallengeResponse */
1725
stream_write(s, ntlmssp->nt_challenge_response.data, NtChallengeResponseLen);
1727
#ifdef WITH_DEBUG_NLA
1728
if (ntlmssp->ntlm_v2)
1730
ntlmssp_print_av_pairs(ntlmssp);
1732
printf("targetInfo (length = %d)\n", ntlmssp->target_info.length);
1733
freerdp_hexdump(ntlmssp->target_info.data, ntlmssp->target_info.length);
1738
#ifdef WITH_DEBUG_NLA
1739
printf("NtChallengeResponse (length = %d, offset = %d)\n", NtChallengeResponseLen, NtChallengeResponseBufferOffset);
1740
freerdp_hexdump(ntlmssp->nt_challenge_response.data, NtChallengeResponseLen);
1744
/* EncryptedRandomSessionKey */
1745
stream_write(s, EncryptedRandomSessionKeyBuffer, EncryptedRandomSessionKeyLen);
1747
#ifdef WITH_DEBUG_NLA
1748
printf("EncryptedRandomSessionKey (length = %d, offset = %d)\n", EncryptedRandomSessionKeyLen, EncryptedRandomSessionKeyBufferOffset);
1749
freerdp_hexdump(EncryptedRandomSessionKeyBuffer, EncryptedRandomSessionKeyLen);
1753
length = s->p - s->data;
1754
freerdp_blob_alloc(&ntlmssp->authenticate_message, length);
1755
memcpy(ntlmssp->authenticate_message.data, s->data, length);
1757
if (ntlmssp->ntlm_v2)
1759
/* Message Integrity Check */
1760
ntlmssp_compute_message_integrity_check(ntlmssp);
1763
stream_write(s, ntlmssp->message_integrity_check, 16);
1764
s->p = s->data + length;
1766
#ifdef WITH_DEBUG_NLA
1767
printf("MessageIntegrityCheck (length = 16)\n");
1768
freerdp_hexdump(mic_offset, 16);
1773
#ifdef WITH_DEBUG_NLA
1774
printf("AUTHENTICATE_MESSAGE (length = %d)\n", length);
1775
freerdp_hexdump(s->data, length);
1779
ntlmssp->state = NTLMSSP_STATE_FINAL;
1783
* Send NTLMSSP message.
1789
int ntlmssp_send(NTLMSSP* ntlmssp, STREAM* s)
1791
if (ntlmssp->state == NTLMSSP_STATE_INITIAL)
1792
ntlmssp->state = NTLMSSP_STATE_NEGOTIATE;
1794
if (ntlmssp->state == NTLMSSP_STATE_NEGOTIATE)
1795
ntlmssp_send_negotiate_message(ntlmssp, s);
1796
else if (ntlmssp->state == NTLMSSP_STATE_AUTHENTICATE)
1797
ntlmssp_send_authenticate_message(ntlmssp, s);
1799
return (ntlmssp->state == NTLMSSP_STATE_FINAL) ? 0 : 1;
1803
* Receive NTLMSSP message.
1809
int ntlmssp_recv(NTLMSSP* ntlmssp, STREAM* s)
1811
char signature[8]; /* Signature, "NTLMSSP" */
1812
uint32 messageType; /* MessageType */
1814
stream_read(s, signature, 8);
1815
stream_read_uint32(s, messageType);
1817
if (messageType == 2 && ntlmssp->state == NTLMSSP_STATE_CHALLENGE)
1818
ntlmssp_recv_challenge_message(ntlmssp, s);
1824
* Create new NTLMSSP state machine instance.
1828
NTLMSSP* ntlmssp_new()
1830
NTLMSSP* ntlmssp = (NTLMSSP*) xmalloc(sizeof(NTLMSSP));
1832
if (ntlmssp != NULL)
1834
memset(ntlmssp, '\0', sizeof(NTLMSSP));
1835
ntlmssp->av_pairs = (AV_PAIRS*) xmalloc(sizeof(AV_PAIRS));
1836
memset(ntlmssp->av_pairs, 0, sizeof(AV_PAIRS));
1837
ntlmssp_init(ntlmssp);
1844
* Initialize NTLMSSP state machine.
1848
void ntlmssp_init(NTLMSSP* ntlmssp)
1850
ntlmssp->state = NTLMSSP_STATE_INITIAL;
1851
ntlmssp->uniconv = freerdp_uniconv_new();
1855
* Finalize NTLMSSP state machine.
1859
void ntlmssp_uninit(NTLMSSP* ntlmssp)
1861
freerdp_blob_free(&ntlmssp->username);
1862
freerdp_blob_free(&ntlmssp->password);
1863
freerdp_blob_free(&ntlmssp->domain);
1865
freerdp_blob_free(&ntlmssp->spn);
1866
freerdp_blob_free(&ntlmssp->workstation);
1867
freerdp_blob_free(&ntlmssp->target_info);
1868
freerdp_blob_free(&ntlmssp->target_name);
1870
freerdp_blob_free(&ntlmssp->negotiate_message);
1871
freerdp_blob_free(&ntlmssp->challenge_message);
1872
freerdp_blob_free(&ntlmssp->authenticate_message);
1874
freerdp_blob_free(&ntlmssp->lm_challenge_response);
1875
freerdp_blob_free(&ntlmssp->nt_challenge_response);
1877
ntlmssp_free_av_pairs(ntlmssp);
1878
freerdp_uniconv_free(ntlmssp->uniconv);
1880
ntlmssp->state = NTLMSSP_STATE_FINAL;
1884
* Free NTLMSSP state machine.
1888
void ntlmssp_free(NTLMSSP* ntlmssp)
1890
ntlmssp_uninit(ntlmssp);
1892
if (ntlmssp->send_rc4_seal)
1893
crypto_rc4_free(ntlmssp->send_rc4_seal);
1894
if (ntlmssp->recv_rc4_seal)
1895
crypto_rc4_free(ntlmssp->recv_rc4_seal);
added
removed
libfreerdp-core/ntlmssp.c
