--- /dev/null
+/**
+ * FreeRDP: A Remote Desktop Protocol Client
+ * Credential Security Support Provider (CredSSP)
+ *
+ * Copyright 2010 Marc-Andre Moreau <marcandre.moreau@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "frdp.h"
+#include "rdp.h"
+#include "tls.h"
+#include "asn1.h"
+#include "security.h"
+#include "stream.h"
+#include "tcp.h"
+#include "mcs.h"
+#include "iso.h"
+#ifndef _WIN32
+#include <unistd.h>
+#endif
+
+#include "TSRequest.h"
+#include "NegoData.h"
+#include "NegotiationToken.h"
+#include "TSCredentials.h"
+#include "TSPasswordCreds.h"
+
+#include <time.h>
+#include "ntlmssp.h"
+#include <freerdp/rdpset.h>
+#include <freerdp/utils/memory.h>
+
+#include "credssp.h"
+
+static int
+asn1_write(const void *buffer, size_t size, void *fd)
+{
+ /* this is used to get the size of the ASN.1 encoded result */
+ return 0;
+}
+
+/**
+ * Initialize NTLMSSP authentication module.
+ * @param credssp
+ */
+
+void credssp_ntlmssp_init(rdpCredssp *credssp)
+{
+ NTLMSSP *ntlmssp = credssp->ntlmssp;
+ rdpSet *settings = credssp->net->rdp->settings;
+
+ ntlmssp_set_password(ntlmssp, settings->password);
+ ntlmssp_set_username(ntlmssp, settings->username);
+
+ if (settings->domain != NULL)
+ {
+ if (strlen(settings->domain) > 0)
+ {
+ ntlmssp_set_domain(ntlmssp, settings->domain);
+ }
+ }
+ else
+ {
+ ntlmssp_set_domain(ntlmssp, NULL);
+ }
+
+ ntlmssp_generate_client_challenge(ntlmssp);
+ ntlmssp_generate_random_session_key(ntlmssp);
+ ntlmssp_generate_exported_session_key(ntlmssp);
+
+ ntlmssp->ntlm_v2 = 0;
+}
+
+/**
+ * Get TLS public key.
+ * @param credssp
+ */
+
+int credssp_get_public_key(rdpCredssp *credssp)
+{
+ CryptoCert cert;
+ int ret;
+
+ cert = tls_get_certificate(credssp->net->tls);
+ if (cert == NULL)
+ {
+ printf("credssp_get_public_key: tls_get_certificate failed to return the server certificate.\n");
+ return 0;
+ }
+ ret = crypto_cert_get_public_key(cert, &credssp->public_key);
+ crypto_cert_free(cert);
+
+ return ret;
+}
+
+/**
+ * Authenticate with server using CredSSP.
+ * @param credssp
+ * @return 1 if authentication is successful
+ */
+
+int credssp_authenticate(rdpCredssp *credssp)
+{
+ NTLMSSP *ntlmssp = credssp->ntlmssp;
+ STREAM s = xmalloc(sizeof(struct stream));
+ uint8* negoTokenBuffer = (uint8*) xmalloc(2048);
+
+ credssp_ntlmssp_init(credssp);
+
+ if (credssp_get_public_key(credssp) == 0)
+ return 0;
+
+ /* NTLMSSP NEGOTIATE MESSAGE */
+ s->p = s->end = s->data = negoTokenBuffer;
+ ntlmssp_send(ntlmssp, s);
+ credssp->negoToken.data = s->data;
+ credssp->negoToken.length = s->end - s->data;
+ credssp_send(credssp, &credssp->negoToken, NULL, NULL);
+
+ /* NTLMSSP CHALLENGE MESSAGE */
+ if (credssp_recv(credssp, &credssp->negoToken, NULL, NULL) < 0)
+ return -1;
+
+ s->p = s->data = credssp->negoToken.data;
+ s->end = s->p + credssp->negoToken.length;
+ ntlmssp_recv(ntlmssp, s);
+
+ datablob_free(&credssp->negoToken);
+
+ /* NTLMSSP AUTHENTICATE MESSAGE */
+ s->p = s->end = s->data = negoTokenBuffer;
+ ntlmssp_send(ntlmssp, s);
+
+ /* The last NTLMSSP message is sent with the encrypted public key */
+ credssp->negoToken.data = s->data;
+ credssp->negoToken.length = s->end - s->data;
+ credssp_encrypt_public_key(credssp, &credssp->pubKeyAuth);
+ credssp_send(credssp, &credssp->negoToken, &credssp->pubKeyAuth, NULL);
+
+ /* Encrypted Public Key +1 */
+ if (credssp_recv(credssp, &credssp->negoToken, &credssp->pubKeyAuth, NULL) < 0)
+ return -1;
+
+ if (credssp_verify_public_key(credssp, &credssp->pubKeyAuth) == 0)
+ {
+ /* Failed to verify server public key echo */
+ return 0; /* DO NOT SEND CREDENTIALS! */
+ }
+
+ datablob_free(&credssp->negoToken);
+ datablob_free(&credssp->pubKeyAuth);
+
+ /* Send encrypted credentials */
+ credssp_encode_ts_credentials(credssp);
+ credssp_encrypt_ts_credentials(credssp, &credssp->authInfo);
+ credssp_send(credssp, NULL, NULL, &credssp->authInfo);
+
+ xfree(s);
+
+ return 1;
+}
+
+/**
+ * Encrypt TLS public key using CredSSP.
+ * @param credssp
+ * @param s
+ */
+
+void credssp_encrypt_public_key(rdpCredssp *credssp, DATABLOB *d)
+{
+ uint8 *p;
+ uint8 signature[16];
+ DATABLOB encrypted_public_key;
+ NTLMSSP *ntlmssp = credssp->ntlmssp;
+
+ datablob_alloc(d, credssp->public_key.length + 16);
+ ntlmssp_encrypt_message(ntlmssp, &credssp->public_key, &encrypted_public_key, signature);
+
+#ifdef WITH_DEBUG_NLA
+ printf("Public Key (length = %d)\n", credssp->public_key.length);
+ hexdump(credssp->public_key.data, credssp->public_key.length);
+ printf("\n");
+
+ printf("Encrypted Public Key (length = %d)\n", encrypted_public_key.length);
+ hexdump(encrypted_public_key.data, encrypted_public_key.length);
+ printf("\n");
+
+ printf("Signature\n");
+ hexdump(signature, 16);
+ printf("\n");
+#endif
+
+ p = (uint8*) d->data;
+ memcpy(p, signature, 16); /* Message Signature */
+ memcpy(&p[16], encrypted_public_key.data, encrypted_public_key.length); /* Encrypted Public Key */
+
+ datablob_free(&encrypted_public_key);
+}
+
+/**
+ * Verify TLS public key using CredSSP.
+ * @param credssp
+ * @param s
+ * @return 1 if verification is successful, 0 otherwise
+ */
+
+int credssp_verify_public_key(rdpCredssp *credssp, DATABLOB *d)
+{
+ uint8 *p1, *p2;
+ uint8 *signature;
+ DATABLOB public_key;
+ DATABLOB encrypted_public_key;
+
+ signature = d->data;
+ encrypted_public_key.data = (void*) (signature + 16);
+ encrypted_public_key.length = d->length - 16;
+
+ ntlmssp_decrypt_message(credssp->ntlmssp, &encrypted_public_key, &public_key, signature);
+
+ p1 = (uint8*) credssp->public_key.data;
+ p2 = (uint8*) public_key.data;
+
+ p2[0]--;
+
+ if (memcmp(p1, p2, public_key.length) != 0)
+ {
+ printf("Could not verify server's public key echo\n");
+ return 0;
+ }
+
+ p2[0]++;
+ datablob_free(&public_key);
+ return 1;
+}
+
+/**
+ * Encrypt and sign TSCredentials structure.
+ * @param credssp
+ * @param s
+ */
+
+void credssp_encrypt_ts_credentials(rdpCredssp *credssp, DATABLOB *d)
+{
+ uint8 *p;
+ uint8 signature[16];
+ DATABLOB encrypted_ts_credentials;
+ NTLMSSP *ntlmssp = credssp->ntlmssp;
+
+ datablob_alloc(d, credssp->ts_credentials.length + 16);
+ ntlmssp_encrypt_message(ntlmssp, &credssp->ts_credentials, &encrypted_ts_credentials, signature);
+
+#ifdef WITH_DEBUG_NLA
+ printf("TSCredentials (length = %d)\n", credssp->ts_credentials.length);
+ hexdump(credssp->ts_credentials.data, credssp->ts_credentials.length);
+ printf("\n");
+
+ printf("Encrypted TSCredentials (length = %d)\n", encrypted_ts_credentials.length);
+ hexdump(encrypted_ts_credentials.data, encrypted_ts_credentials.length);
+ printf("\n");
+
+ printf("Signature\n");
+ hexdump(signature, 16);
+ printf("\n");
+#endif
+
+ p = (uint8*) d->data;
+ memcpy(p, signature, 16); /* Message Signature */
+ memcpy(&p[16], encrypted_ts_credentials.data, encrypted_ts_credentials.length); /* Encrypted TSCredentials */
+
+ datablob_free(&encrypted_ts_credentials);
+}
+
+/**
+ * Encode TSCredentials structure.
+ * @param credssp
+ */
+
+void credssp_encode_ts_credentials(rdpCredssp *credssp)
+{
+ asn_enc_rval_t enc_rval;
+ TSCredentials_t *ts_credentials;
+ TSPasswordCreds_t *ts_password_creds;
+ DATABLOB ts_password_creds_buffer = { 0 };
+
+ ts_credentials = calloc(1, sizeof(TSCredentials_t));
+ ts_credentials->credType = 1; /* TSPasswordCreds */
+
+ ts_password_creds = calloc(1, sizeof(TSPasswordCreds_t));
+
+ /* Domain */
+ ts_password_creds->domainName.buf = credssp->ntlmssp->domain.data;
+ ts_password_creds->domainName.size = credssp->ntlmssp->domain.length;
+
+ /* Username */
+ ts_password_creds->userName.buf = credssp->ntlmssp->username.data;
+ ts_password_creds->userName.size = credssp->ntlmssp->username.length;
+
+ /* Password */
+ ts_password_creds->password.buf = credssp->ntlmssp->password.data;
+ ts_password_creds->password.size = credssp->ntlmssp->password.length;
+
+ /* get size ASN.1 encoded TSPasswordCreds */
+ enc_rval = der_encode(&asn_DEF_TSPasswordCreds, ts_password_creds, asn1_write, 0);
+
+ if (enc_rval.encoded != -1)
+ {
+ datablob_alloc(&ts_password_creds_buffer, enc_rval.encoded);
+
+ enc_rval = der_encode_to_buffer(&asn_DEF_TSPasswordCreds, ts_password_creds,
+ ts_password_creds_buffer.data, ts_password_creds_buffer.length);
+ }
+
+ ts_credentials->credentials.buf = ts_password_creds_buffer.data;
+ ts_credentials->credentials.size = ts_password_creds_buffer.length;
+
+ /* get size ASN.1 encoded TSCredentials */
+ enc_rval = der_encode(&asn_DEF_TSCredentials, ts_credentials, asn1_write, 0);
+
+ if (enc_rval.encoded != -1)
+ {
+ datablob_alloc(&credssp->ts_credentials, enc_rval.encoded);
+
+ enc_rval = der_encode_to_buffer(&asn_DEF_TSCredentials, ts_credentials,
+ credssp->ts_credentials.data, credssp->ts_credentials.length);
+ }
+
+ datablob_free(&ts_password_creds_buffer);
+ free(ts_credentials);
+ free(ts_password_creds);
+}
+
+/**
+ * Send CredSSP message.
+ * @param credssp
+ * @param negoToken
+ * @param pubKeyAuth
+ * @param authInfo
+ */
+
+void credssp_send(rdpCredssp *credssp, DATABLOB *negoToken, DATABLOB *pubKeyAuth, DATABLOB *authInfo)
+{
+ TSRequest_t *ts_request;
+ OCTET_STRING_t *nego_token;
+ asn_enc_rval_t enc_rval;
+
+ char* buffer;
+ size_t size;
+
+ ts_request = calloc(1, sizeof(TSRequest_t));
+ ts_request->version = 2;
+
+ if (negoToken != NULL)
+ {
+ ts_request->negoTokens = calloc(1, sizeof(NegoData_t));
+ nego_token = calloc(1, sizeof(OCTET_STRING_t));
+ nego_token->size = negoToken->length;
+ nego_token->buf = malloc(nego_token->size);
+ memcpy(nego_token->buf, negoToken->data, nego_token->size);
+ ASN_SEQUENCE_ADD(ts_request->negoTokens, nego_token);
+ }
+
+ if (pubKeyAuth != NULL)
+ {
+ ts_request->pubKeyAuth = calloc(1, sizeof(OCTET_STRING_t));
+ ts_request->pubKeyAuth->buf = pubKeyAuth->data;
+ ts_request->pubKeyAuth->size = pubKeyAuth->length;
+ }
+
+ if (authInfo != NULL)
+ {
+ ts_request->authInfo = calloc(1, sizeof(OCTET_STRING_t));
+ ts_request->authInfo->buf = authInfo->data;
+ ts_request->authInfo->size = authInfo->length;
+ }
+
+ /* get size of the encoded ASN.1 payload */
+ enc_rval = der_encode(&asn_DEF_TSRequest, ts_request, asn1_write, 0);
+
+ if (enc_rval.encoded != -1)
+ {
+ size = enc_rval.encoded;
+ buffer = xmalloc(size);
+
+ enc_rval = der_encode_to_buffer(&asn_DEF_TSRequest, ts_request, buffer, size);
+
+ if (enc_rval.encoded != -1)
+ {
+ tls_write(credssp->net->tls, buffer, size);
+ }
+
+ asn_DEF_TSRequest.free_struct(&asn_DEF_TSRequest, ts_request, 0);
+ xfree(buffer);
+ }
+}
+
+/**
+ * Receive CredSSP message.
+ * @param credssp
+ * @param negoToken
+ * @param pubKeyAuth
+ * @param authInfo
+ * @return
+ */
+
+int credssp_recv(rdpCredssp *credssp, DATABLOB *negoToken, DATABLOB *pubKeyAuth, DATABLOB *authInfo)
+{
+ int bytes_read;
+ int size = 2048;
+ char *recv_buffer;
+ asn_dec_rval_t dec_rval;
+ TSRequest_t *ts_request = 0;
+
+ recv_buffer = xmalloc(size);
+ bytes_read = tls_read(credssp->net->tls, recv_buffer, size);
+
+ if (bytes_read < 0)
+ return -1;
+
+ dec_rval = ber_decode(0, &asn_DEF_TSRequest, (void **)&ts_request, recv_buffer, bytes_read);
+
+ if(dec_rval.code == RC_OK)
+ {
+ if (ts_request->negoTokens != NULL)
+ {
+ if (ts_request->negoTokens->list.count > 0)
+ {
+ datablob_alloc(negoToken, ts_request->negoTokens->list.array[0]->negoToken.size);
+ memcpy(negoToken->data, ts_request->negoTokens->list.array[0]->negoToken.buf, negoToken->length);
+ }
+ }
+
+ if (ts_request->pubKeyAuth != NULL)
+ {
+ datablob_alloc(pubKeyAuth, ts_request->pubKeyAuth->size);
+ memcpy(pubKeyAuth->data, ts_request->pubKeyAuth->buf, pubKeyAuth->length);
+ }
+
+ asn_DEF_TSRequest.free_struct(&asn_DEF_TSRequest, ts_request, 0);
+ }
+ else
+ {
+ printf("Failed to decode TSRequest\n");
+ asn_DEF_TSRequest.free_struct(&asn_DEF_TSRequest, ts_request, 0);
+ }
+
+ xfree(recv_buffer);
+ 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 sec
+ * @return new CredSSP state machine.
+ */
+
+rdpCredssp *
+credssp_new(struct rdp_network * net)
+{
+ rdpCredssp * self;
+
+ self = (rdpCredssp *) xmalloc(sizeof(rdpCredssp));
+ if (self != NULL)
+ {
+ memset(self, 0, sizeof(rdpCredssp));
+ self->net = net;
+ 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)
+ {
+ datablob_free(&credssp->public_key);
+ datablob_free(&credssp->ts_credentials);
+
+ ntlmssp_free(credssp->ntlmssp);
+ xfree(credssp);
+ }
+}
projects / platform / upstream / freerdp.git / commitdiff