mirror of https://github.com/FreeRDP/FreeRDP
644 lines
16 KiB
C
644 lines
16 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Client
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* Credential Security Support Provider (CredSSP)
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*
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* Copyright 2010 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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*/
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#ifndef _WIN32
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#include <unistd.h>
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#endif
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#include <time.h>
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#include "ntlmssp.h"
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#include "credssp.h"
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/**
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* TSRequest ::= SEQUENCE {
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* version [0] INTEGER,
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* negoTokens [1] NegoData OPTIONAL,
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* authInfo [2] OCTET STRING OPTIONAL,
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* pubKeyAuth [3] OCTET STRING OPTIONAL
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* }
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*
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* NegoData ::= SEQUENCE OF NegoDataItem
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*
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* NegoDataItem ::= SEQUENCE {
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* negoToken [0] OCTET STRING
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* }
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*
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* TSCredentials ::= SEQUENCE {
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* credType [0] INTEGER,
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* credentials [1] OCTET STRING
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* }
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*
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* TSPasswordCreds ::= SEQUENCE {
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* domainName [0] OCTET STRING,
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* userName [1] OCTET STRING,
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* password [2] OCTET STRING
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* }
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*
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* TSSmartCardCreds ::= SEQUENCE {
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* pin [0] OCTET STRING,
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* cspData [1] TSCspDataDetail,
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* userHint [2] OCTET STRING OPTIONAL,
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* domainHint [3] OCTET STRING OPTIONAL
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* }
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*
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* TSCspDataDetail ::= SEQUENCE {
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* keySpec [0] INTEGER,
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* cardName [1] OCTET STRING OPTIONAL,
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* readerName [2] OCTET STRING OPTIONAL,
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* containerName [3] OCTET STRING OPTIONAL,
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* cspName [4] OCTET STRING OPTIONAL
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* }
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*
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*/
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/**
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* Initialize NTLMSSP authentication module.
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* @param credssp
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*/
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void credssp_ntlmssp_init(rdpCredssp* credssp)
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{
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NTLMSSP *ntlmssp = credssp->ntlmssp;
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rdpSettings *settings = credssp->transport->settings;
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ntlmssp_set_password(ntlmssp, settings->password);
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ntlmssp_set_username(ntlmssp, settings->username);
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if (settings->domain != NULL)
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{
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if (strlen(settings->domain) > 0)
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{
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ntlmssp_set_domain(ntlmssp, settings->domain);
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}
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}
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else
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{
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ntlmssp_set_domain(ntlmssp, NULL);
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}
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ntlmssp_generate_client_challenge(ntlmssp);
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ntlmssp_generate_random_session_key(ntlmssp);
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ntlmssp_generate_exported_session_key(ntlmssp);
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ntlmssp->ntlm_v2 = 0;
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}
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/**
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* Get TLS public key.
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* @param credssp
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*/
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int credssp_get_public_key(rdpCredssp* credssp)
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{
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int ret;
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CryptoCert cert;
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cert = tls_get_certificate(credssp->transport->tls);
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if (cert == NULL)
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{
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printf("credssp_get_public_key: tls_get_certificate failed to return the server certificate.\n");
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return 0;
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}
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if(tls_verify_certificate(cert,credssp->transport->settings->hostname))
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tls_disconnect(credssp->transport->tls);
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ret = crypto_cert_get_public_key(cert, &credssp->public_key);
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crypto_cert_free(cert);
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return ret;
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}
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/**
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* Authenticate with server using CredSSP.
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* @param credssp
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* @return 1 if authentication is successful
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*/
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int credssp_authenticate(rdpCredssp* credssp)
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{
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NTLMSSP *ntlmssp = credssp->ntlmssp;
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STREAM* s = stream_new(0);
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uint8* negoTokenBuffer = (uint8*) xmalloc(2048);
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credssp_ntlmssp_init(credssp);
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if (credssp_get_public_key(credssp) == 0)
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return 0;
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/* NTLMSSP NEGOTIATE MESSAGE */
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s->p = s->data = negoTokenBuffer;
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ntlmssp_send(ntlmssp, s);
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credssp->negoToken.data = s->data;
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credssp->negoToken.length = s->p - s->data;
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credssp_send(credssp, &credssp->negoToken, NULL, NULL);
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/* NTLMSSP CHALLENGE MESSAGE */
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if (credssp_recv(credssp, &credssp->negoToken, NULL, NULL) < 0)
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return -1;
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s->p = s->data = credssp->negoToken.data;
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ntlmssp_recv(ntlmssp, s);
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freerdp_blob_free(&credssp->negoToken);
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/* NTLMSSP AUTHENTICATE MESSAGE */
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s->p = s->data = negoTokenBuffer;
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ntlmssp_send(ntlmssp, s);
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/* The last NTLMSSP message is sent with the encrypted public key */
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credssp->negoToken.data = s->data;
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credssp->negoToken.length = s->p - s->data;
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credssp_encrypt_public_key(credssp, &credssp->pubKeyAuth);
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credssp_send(credssp, &credssp->negoToken, NULL, &credssp->pubKeyAuth);
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/* Encrypted Public Key +1 */
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if (credssp_recv(credssp, &credssp->negoToken, NULL, &credssp->pubKeyAuth) < 0)
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return -1;
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if (credssp_verify_public_key(credssp, &credssp->pubKeyAuth) == 0)
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{
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/* Failed to verify server public key echo */
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return 0; /* DO NOT SEND CREDENTIALS! */
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}
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freerdp_blob_free(&credssp->negoToken);
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freerdp_blob_free(&credssp->pubKeyAuth);
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/* Send encrypted credentials */
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credssp_encode_ts_credentials(credssp);
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credssp_encrypt_ts_credentials(credssp, &credssp->authInfo);
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credssp_send(credssp, NULL, &credssp->authInfo, NULL);
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xfree(s);
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return 1;
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}
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/**
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* Encrypt TLS public key using CredSSP.
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* @param credssp
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* @param s
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*/
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void credssp_encrypt_public_key(rdpCredssp* credssp, rdpBlob* d)
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{
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uint8 *p;
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uint8 signature[16];
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rdpBlob encrypted_public_key;
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NTLMSSP *ntlmssp = credssp->ntlmssp;
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freerdp_blob_alloc(d, credssp->public_key.length + 16);
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ntlmssp_encrypt_message(ntlmssp, &credssp->public_key, &encrypted_public_key, signature);
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#ifdef WITH_DEBUG_NLA
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printf("Public Key (length = %d)\n", credssp->public_key.length);
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freerdp_hexdump(credssp->public_key.data, credssp->public_key.length);
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printf("\n");
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printf("Encrypted Public Key (length = %d)\n", encrypted_public_key.length);
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freerdp_hexdump(encrypted_public_key.data, encrypted_public_key.length);
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printf("\n");
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printf("Signature\n");
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freerdp_hexdump(signature, 16);
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printf("\n");
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#endif
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p = (uint8*) d->data;
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memcpy(p, signature, 16); /* Message Signature */
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memcpy(&p[16], encrypted_public_key.data, encrypted_public_key.length); /* Encrypted Public Key */
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freerdp_blob_free(&encrypted_public_key);
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}
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/**
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* Verify TLS public key using CredSSP.
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* @param credssp
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* @param s
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* @return 1 if verification is successful, 0 otherwise
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*/
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int credssp_verify_public_key(rdpCredssp* credssp, rdpBlob* d)
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{
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uint8 *p1, *p2;
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uint8 *signature;
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rdpBlob public_key;
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rdpBlob encrypted_public_key;
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signature = d->data;
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encrypted_public_key.data = (void*) (signature + 16);
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encrypted_public_key.length = d->length - 16;
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ntlmssp_decrypt_message(credssp->ntlmssp, &encrypted_public_key, &public_key, signature);
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p1 = (uint8*) credssp->public_key.data;
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p2 = (uint8*) public_key.data;
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p2[0]--;
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if (memcmp(p1, p2, public_key.length) != 0)
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{
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printf("Could not verify server's public key echo\n");
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return 0;
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}
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p2[0]++;
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freerdp_blob_free(&public_key);
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return 1;
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}
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/**
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* Encrypt and sign TSCredentials structure.
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* @param credssp
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* @param s
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*/
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void credssp_encrypt_ts_credentials(rdpCredssp* credssp, rdpBlob* d)
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{
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uint8 *p;
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uint8 signature[16];
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rdpBlob encrypted_ts_credentials;
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NTLMSSP *ntlmssp = credssp->ntlmssp;
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freerdp_blob_alloc(d, credssp->ts_credentials.length + 16);
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ntlmssp_encrypt_message(ntlmssp, &credssp->ts_credentials, &encrypted_ts_credentials, signature);
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#ifdef WITH_DEBUG_NLA
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printf("TSCredentials (length = %d)\n", credssp->ts_credentials.length);
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freerdp_hexdump(credssp->ts_credentials.data, credssp->ts_credentials.length);
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printf("\n");
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printf("Encrypted TSCredentials (length = %d)\n", encrypted_ts_credentials.length);
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freerdp_hexdump(encrypted_ts_credentials.data, encrypted_ts_credentials.length);
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printf("\n");
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printf("Signature\n");
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freerdp_hexdump(signature, 16);
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printf("\n");
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#endif
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p = (uint8*) d->data;
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memcpy(p, signature, 16); /* Message Signature */
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memcpy(&p[16], encrypted_ts_credentials.data, encrypted_ts_credentials.length); /* Encrypted TSCredentials */
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freerdp_blob_free(&encrypted_ts_credentials);
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}
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int credssp_skip_ts_password_creds(rdpCredssp* credssp)
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{
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int length;
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int ts_password_creds_length = 0;
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length = ber_skip_octet_string(credssp->ntlmssp->domain.length);
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length += ber_skip_contextual_tag(length);
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ts_password_creds_length += length;
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length = ber_skip_octet_string(credssp->ntlmssp->username.length);
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length += ber_skip_contextual_tag(length);
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ts_password_creds_length += length;
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length = ber_skip_octet_string(credssp->ntlmssp->password.length);
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length += ber_skip_contextual_tag(length);
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ts_password_creds_length += length;
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length = ber_skip_sequence(ts_password_creds_length);
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return length;
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}
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void credssp_write_ts_password_creds(rdpCredssp* credssp, STREAM* s)
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{
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int length;
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length = credssp_skip_ts_password_creds(credssp);
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/* TSPasswordCreds (SEQUENCE) */
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length = ber_get_content_length(length);
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ber_write_sequence_tag(s, length);
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/* [0] domainName (OCTET STRING) */
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ber_write_contextual_tag(s, 0, credssp->ntlmssp->domain.length + 2, True);
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ber_write_octet_string(s, credssp->ntlmssp->domain.data, credssp->ntlmssp->domain.length);
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/* [1] userName (OCTET STRING) */
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ber_write_contextual_tag(s, 1, credssp->ntlmssp->username.length + 2, True);
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ber_write_octet_string(s, credssp->ntlmssp->username.data, credssp->ntlmssp->username.length);
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/* [2] password (OCTET STRING) */
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ber_write_contextual_tag(s, 2, credssp->ntlmssp->password.length + 2, True);
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ber_write_octet_string(s, credssp->ntlmssp->password.data, credssp->ntlmssp->password.length);
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}
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int credssp_skip_ts_credentials(rdpCredssp* credssp)
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{
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int length;
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int ts_password_creds_length;
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int ts_credentials_length = 0;
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length = ber_skip_integer(0);
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length += ber_skip_contextual_tag(length);
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ts_credentials_length += length;
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ts_password_creds_length = credssp_skip_ts_password_creds(credssp);
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length = ber_skip_octet_string(ts_password_creds_length);
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length += ber_skip_contextual_tag(length);
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ts_credentials_length += length;
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length = ber_skip_sequence(ts_credentials_length);
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return length;
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}
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void credssp_write_ts_credentials(rdpCredssp* credssp, STREAM* s)
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{
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int length;
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int ts_password_creds_length;
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length = credssp_skip_ts_credentials(credssp);
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ts_password_creds_length = credssp_skip_ts_password_creds(credssp);
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/* TSCredentials (SEQUENCE) */
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length = ber_get_content_length(length);
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length -= ber_write_sequence_tag(s, length);
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/* [0] credType (INTEGER) */
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length -= ber_write_contextual_tag(s, 0, 3, True);
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length -= ber_write_integer(s, 1);
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/* [1] credentials (OCTET STRING) */
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length -= 1;
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length -= ber_write_contextual_tag(s, 1, length, True);
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length -= ber_write_octet_string_tag(s, ts_password_creds_length);
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credssp_write_ts_password_creds(credssp, s);
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}
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/**
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* Encode TSCredentials structure.
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* @param credssp
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*/
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void credssp_encode_ts_credentials(rdpCredssp* credssp)
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{
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STREAM* s;
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int length;
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s = stream_new(0);
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length = credssp_skip_ts_credentials(credssp);
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freerdp_blob_alloc(&credssp->ts_credentials, length);
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s->p = s->data = credssp->ts_credentials.data;
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s->size = length;
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credssp_write_ts_credentials(credssp, s);
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}
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int credssp_skip_nego_token(int length)
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{
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length = ber_skip_octet_string(length);
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length += ber_skip_contextual_tag(length);
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return length;
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}
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int credssp_skip_nego_tokens(int length)
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{
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length = credssp_skip_nego_token(length);
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length += ber_skip_sequence_tag(length);
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length += ber_skip_sequence_tag(length);
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length += ber_skip_contextual_tag(length);
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return length;
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}
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int credssp_skip_pub_key_auth(int length)
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{
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length = ber_skip_octet_string(length);
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length += ber_skip_contextual_tag(length);
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return length;
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}
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int credssp_skip_auth_info(int length)
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{
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length = ber_skip_octet_string(length);
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length += ber_skip_contextual_tag(length);
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return length;
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}
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int credssp_skip_ts_request(int length)
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{
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length += ber_skip_integer(2);
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length += ber_skip_contextual_tag(3);
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length += ber_skip_sequence_tag(length);
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return length;
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}
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/**
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* Send CredSSP message.
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* @param credssp
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* @param negoToken
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* @param authInfo
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* @param pubKeyAuth
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*/
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void credssp_send(rdpCredssp* credssp, rdpBlob* negoToken, rdpBlob* authInfo, rdpBlob* pubKeyAuth)
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{
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STREAM* s;
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int length;
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int ts_request_length;
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int nego_tokens_length;
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int pub_key_auth_length;
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int auth_info_length;
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nego_tokens_length = (negoToken != NULL) ? credssp_skip_nego_tokens(negoToken->length) : 0;
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pub_key_auth_length = (pubKeyAuth != NULL) ? credssp_skip_pub_key_auth(pubKeyAuth->length) : 0;
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auth_info_length = (authInfo != NULL) ? credssp_skip_auth_info(authInfo->length) : 0;
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length = nego_tokens_length + pub_key_auth_length + auth_info_length;
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ts_request_length = credssp_skip_ts_request(length);
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s = stream_new(ts_request_length);
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/* TSRequest */
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length = ber_get_content_length(ts_request_length);
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ber_write_sequence_tag(s, length); /* SEQUENCE */
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ber_write_contextual_tag(s, 0, 3, True); /* [0] version */
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ber_write_integer(s, 2); /* INTEGER */
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/* [1] negoTokens (NegoData) */
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if (nego_tokens_length > 0)
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{
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length = ber_get_content_length(nego_tokens_length);
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length -= ber_write_contextual_tag(s, 1, length, True); /* NegoData */
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length -= ber_write_sequence_tag(s, length); /* SEQUENCE OF NegoDataItem */
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length -= ber_write_sequence_tag(s, length); /* NegoDataItem */
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length -= ber_write_contextual_tag(s, 0, length, True); /* [0] negoToken */
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ber_write_octet_string(s, negoToken->data, length); /* OCTET STRING */
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}
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/* [2] authInfo (OCTET STRING) */
|
|
if (auth_info_length > 0)
|
|
{
|
|
length = ber_get_content_length(auth_info_length);
|
|
length -= ber_write_contextual_tag(s, 2, length, True);
|
|
ber_write_octet_string(s, authInfo->data, authInfo->length);
|
|
}
|
|
|
|
/* [3] pubKeyAuth (OCTET STRING) */
|
|
if (pub_key_auth_length > 0)
|
|
{
|
|
length = ber_get_content_length(pub_key_auth_length);
|
|
length -= ber_write_contextual_tag(s, 3, length, True);
|
|
ber_write_octet_string(s, pubKeyAuth->data, length);
|
|
}
|
|
|
|
transport_write(credssp->transport, s);
|
|
}
|
|
|
|
/**
|
|
* Receive CredSSP message.
|
|
* @param credssp
|
|
* @param negoToken
|
|
* @param authInfo
|
|
* @param pubKeyAuth
|
|
* @return
|
|
*/
|
|
|
|
int credssp_recv(rdpCredssp* credssp, rdpBlob* negoToken, rdpBlob* authInfo, rdpBlob* pubKeyAuth)
|
|
{
|
|
STREAM* s;
|
|
int length;
|
|
int status;
|
|
uint32 version;
|
|
|
|
s = transport_recv_stream_init(credssp->transport, 2048);
|
|
status = transport_read(credssp->transport, s);
|
|
|
|
if (status < 0)
|
|
return -1;
|
|
|
|
/* TSRequest */
|
|
ber_read_sequence_tag(s, &length);
|
|
ber_read_contextual_tag(s, 0, &length, True);
|
|
ber_read_integer(s, &version);
|
|
|
|
/* [1] negoTokens (NegoData) */
|
|
if (ber_read_contextual_tag(s, 1, &length, True) != False)
|
|
{
|
|
ber_read_sequence_tag(s, &length); /* SEQUENCE OF NegoDataItem */
|
|
ber_read_sequence_tag(s, &length); /* NegoDataItem */
|
|
ber_read_contextual_tag(s, 0, &length, True); /* [0] negoToken */
|
|
ber_read_octet_string(s, &length); /* OCTET STRING */
|
|
freerdp_blob_alloc(negoToken, length);
|
|
stream_read(s, negoToken->data, length);
|
|
}
|
|
|
|
/* [2] authInfo (OCTET STRING) */
|
|
if (ber_read_contextual_tag(s, 2, &length, True) != False)
|
|
{
|
|
ber_read_octet_string(s, &length); /* OCTET STRING */
|
|
freerdp_blob_alloc(authInfo, length);
|
|
stream_read(s, authInfo->data, length);
|
|
}
|
|
|
|
/* [3] pubKeyAuth (OCTET STRING) */
|
|
if (ber_read_contextual_tag(s, 3, &length, True) != False)
|
|
{
|
|
ber_read_octet_string(s, &length); /* OCTET STRING */
|
|
freerdp_blob_alloc(pubKeyAuth, length);
|
|
stream_read(s, pubKeyAuth->data, length);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Encrypt the given plain text using RC4 and the given key.
|
|
* @param key RC4 key
|
|
* @param length text length
|
|
* @param plaintext plain text
|
|
* @param ciphertext cipher text
|
|
*/
|
|
|
|
void credssp_rc4k(uint8* key, int length, uint8* plaintext, uint8* ciphertext)
|
|
{
|
|
CryptoRc4 rc4;
|
|
|
|
/* Initialize RC4 cipher with key */
|
|
rc4 = crypto_rc4_init((void*) key, 16);
|
|
|
|
/* Encrypt plaintext with key */
|
|
crypto_rc4(rc4, length, (void*) plaintext, (void*) ciphertext);
|
|
|
|
/* Free RC4 Cipher */
|
|
crypto_rc4_free(rc4);
|
|
}
|
|
|
|
/**
|
|
* Get current time, in tenths of microseconds since midnight of January 1, 1601.
|
|
* @param[out] timestamp 64-bit little-endian timestamp
|
|
*/
|
|
|
|
void credssp_current_time(uint8* timestamp)
|
|
{
|
|
uint64 time64;
|
|
|
|
/* Timestamp (8 bytes), represented as the number of tenths of microseconds since midnight of January 1, 1601 */
|
|
time64 = time(NULL) + 11644473600LL; /* Seconds since January 1, 1601 */
|
|
time64 *= 10000000; /* Convert timestamp to tenths of a microsecond */
|
|
|
|
memcpy(timestamp, &time64, 8); /* Copy into timestamp in little-endian */
|
|
}
|
|
|
|
/**
|
|
* Create new CredSSP state machine.
|
|
* @param transport
|
|
* @return new CredSSP state machine.
|
|
*/
|
|
|
|
rdpCredssp* credssp_new(rdpTransport* transport)
|
|
{
|
|
rdpCredssp* self;
|
|
|
|
self = (rdpCredssp*) xzalloc(sizeof(rdpCredssp));
|
|
|
|
if (self != NULL)
|
|
{
|
|
self->transport = transport;
|
|
self->send_seq_num = 0;
|
|
self->ntlmssp = ntlmssp_new();
|
|
}
|
|
|
|
return self;
|
|
}
|
|
|
|
/**
|
|
* Free CredSSP state machine.
|
|
* @param credssp
|
|
*/
|
|
|
|
void credssp_free(rdpCredssp* credssp)
|
|
{
|
|
if (credssp != NULL)
|
|
{
|
|
freerdp_blob_free(&credssp->public_key);
|
|
freerdp_blob_free(&credssp->ts_credentials);
|
|
|
|
ntlmssp_free(credssp->ntlmssp);
|
|
xfree(credssp);
|
|
}
|
|
}
|