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FreeRDP/libfreerdp/crypto/tls.c

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/**
* FreeRDP: A Remote Desktop Protocol Implementation
* Transport Layer Security
*
* Copyright 2011-2012 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <assert.h>
#include <winpr/crt.h>
#include <winpr/sspi.h>
#include <winpr/stream.h>
#include <freerdp/utils/tcp.h>
#include <freerdp/utils/ringbuffer.h>
#include <freerdp/crypto/tls.h>
#include "../core/tcp.h"
static CryptoCert tls_get_certificate(rdpTls* tls, BOOL peer)
{
CryptoCert cert;
X509* remote_cert;
if (peer)
remote_cert = SSL_get_peer_certificate(tls->ssl);
else
remote_cert = SSL_get_certificate(tls->ssl);
if (!remote_cert)
{
fprintf(stderr, "%s: failed to get the server TLS certificate\n", __FUNCTION__);
return NULL;
}
cert = malloc(sizeof(*cert));
if (!cert)
{
X509_free(remote_cert);
return NULL;
}
cert->px509 = remote_cert;
return cert;
}
static void tls_free_certificate(CryptoCert cert)
{
X509_free(cert->px509);
free(cert);
}
#define TLS_SERVER_END_POINT "tls-server-end-point:"
SecPkgContext_Bindings* tls_get_channel_bindings(X509* cert)
{
int PrefixLength;
BYTE CertificateHash[32];
UINT32 CertificateHashLength;
BYTE* ChannelBindingToken;
UINT32 ChannelBindingTokenLength;
SEC_CHANNEL_BINDINGS* ChannelBindings;
SecPkgContext_Bindings* ContextBindings;
ZeroMemory(CertificateHash, sizeof(CertificateHash));
X509_digest(cert, EVP_sha256(), CertificateHash, &CertificateHashLength);
PrefixLength = strlen(TLS_SERVER_END_POINT);
ChannelBindingTokenLength = PrefixLength + CertificateHashLength;
ContextBindings = (SecPkgContext_Bindings*) calloc(1, sizeof(SecPkgContext_Bindings));
if (!ContextBindings)
return NULL;
ContextBindings->BindingsLength = sizeof(SEC_CHANNEL_BINDINGS) + ChannelBindingTokenLength;
ChannelBindings = (SEC_CHANNEL_BINDINGS*) calloc(1, ContextBindings->BindingsLength);
if (!ChannelBindings)
goto out_free;
ContextBindings->Bindings = ChannelBindings;
ChannelBindings->cbApplicationDataLength = ChannelBindingTokenLength;
ChannelBindings->dwApplicationDataOffset = sizeof(SEC_CHANNEL_BINDINGS);
ChannelBindingToken = &((BYTE*) ChannelBindings)[ChannelBindings->dwApplicationDataOffset];
strcpy((char*) ChannelBindingToken, TLS_SERVER_END_POINT);
CopyMemory(&ChannelBindingToken[PrefixLength], CertificateHash, CertificateHashLength);
return ContextBindings;
out_free:
free(ContextBindings);
return NULL;
}
#if defined(__APPLE__)
BOOL tls_prepare(rdpTls* tls, BIO *underlying, SSL_METHOD *method, int options, BOOL clientMode)
#else
BOOL tls_prepare(rdpTls* tls, BIO *underlying, const SSL_METHOD *method, int options, BOOL clientMode)
#endif
{
tls->ctx = SSL_CTX_new(method);
if (!tls->ctx)
{
fprintf(stderr, "%s: SSL_CTX_new failed\n", __FUNCTION__);
return FALSE;
}
SSL_CTX_set_mode(tls->ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER | SSL_MODE_ENABLE_PARTIAL_WRITE);
SSL_CTX_set_options(tls->ctx, options);
SSL_CTX_set_read_ahead(tls->ctx, 1);
tls->bio = BIO_new_ssl(tls->ctx, clientMode);
if (BIO_get_ssl(tls->bio, &tls->ssl) < 0)
{
fprintf(stderr, "%s: unable to retrieve the SSL of the connection\n", __FUNCTION__);
return FALSE;
}
BIO_push(tls->bio, underlying);
return TRUE;
}
int tls_do_handshake(rdpTls* tls, BOOL clientMode)
{
CryptoCert cert;
int verify_status, status;
do
{
struct timeval tv;
fd_set rset;
int fd;
status = BIO_do_handshake(tls->bio);
if (status == 1)
break;
if (!BIO_should_retry(tls->bio))
return -1;
/* we select() only for read even if we should test both read and write
* depending of what have blocked */
FD_ZERO(&rset);
fd = BIO_get_fd(tls->bio, NULL);
if (fd < 0)
{
fprintf(stderr, "%s: unable to retrieve BIO fd\n", __FUNCTION__);
return -1;
}
FD_SET(fd, &rset);
tv.tv_sec = 0;
tv.tv_usec = 10 * 1000; /* 10ms */
status = select(fd + 1, &rset, NULL, NULL, &tv);
if (status < 0)
{
fprintf(stderr, "%s: error during select()\n", __FUNCTION__);
return -1;
}
}
while (TRUE);
if (!clientMode)
return 1;
cert = tls_get_certificate(tls, clientMode);
if (!cert)
{
fprintf(stderr, "%s: tls_get_certificate failed to return the server certificate.\n", __FUNCTION__);
return -1;
}
tls->Bindings = tls_get_channel_bindings(cert->px509);
if (!tls->Bindings)
{
fprintf(stderr, "%s: unable to retrieve bindings\n", __FUNCTION__);
return -1;
}
if (!crypto_cert_get_public_key(cert, &tls->PublicKey, &tls->PublicKeyLength))
{
fprintf(stderr, "%s: crypto_cert_get_public_key failed to return the server public key.\n", __FUNCTION__);
tls_free_certificate(cert);
return -1;
}
verify_status = tls_verify_certificate(tls, cert, tls->hostname, tls->port);
if (verify_status < 1)
{
fprintf(stderr, "%s: certificate not trusted, aborting.\n", __FUNCTION__);
tls_disconnect(tls);
tls_free_certificate(cert);
return 0;
}
tls_free_certificate(cert);
return verify_status;
}
int tls_connect(rdpTls* tls, BIO *underlying)
{
int options = 0;
/**
* SSL_OP_NO_COMPRESSION:
*
* The Microsoft RDP server does not advertise support
* for TLS compression, but alternative servers may support it.
* This was observed between early versions of the FreeRDP server
* and the FreeRDP client, and caused major performance issues,
* which is why we're disabling it.
*/
#ifdef SSL_OP_NO_COMPRESSION
options |= SSL_OP_NO_COMPRESSION;
#endif
/**
* SSL_OP_TLS_BLOCK_PADDING_BUG:
*
* The Microsoft RDP server does *not* support TLS padding.
* It absolutely needs to be disabled otherwise it won't work.
*/
options |= SSL_OP_TLS_BLOCK_PADDING_BUG;
/**
* SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS:
*
* Just like TLS padding, the Microsoft RDP server does not
* support empty fragments. This needs to be disabled.
*/
options |= SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
if (!tls_prepare(tls, underlying, TLSv1_client_method(), options, TRUE))
return FALSE;
return tls_do_handshake(tls, TRUE);
}
BOOL tls_accept(rdpTls* tls, BIO *underlying, const char* cert_file, const char* privatekey_file)
{
long options = 0;
/**
* SSL_OP_NO_SSLv2:
*
* We only want SSLv3 and TLSv1, so disable SSLv2.
* SSLv3 is used by, eg. Microsoft RDC for Mac OS X.
*/
options |= SSL_OP_NO_SSLv2;
/**
* SSL_OP_NO_COMPRESSION:
*
* The Microsoft RDP server does not advertise support
* for TLS compression, but alternative servers may support it.
* This was observed between early versions of the FreeRDP server
* and the FreeRDP client, and caused major performance issues,
* which is why we're disabling it.
*/
#ifdef SSL_OP_NO_COMPRESSION
options |= SSL_OP_NO_COMPRESSION;
#endif
/**
* SSL_OP_TLS_BLOCK_PADDING_BUG:
*
* The Microsoft RDP server does *not* support TLS padding.
* It absolutely needs to be disabled otherwise it won't work.
*/
options |= SSL_OP_TLS_BLOCK_PADDING_BUG;
/**
* SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS:
*
* Just like TLS padding, the Microsoft RDP server does not
* support empty fragments. This needs to be disabled.
*/
options |= SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
if (!tls_prepare(tls, underlying, SSLv23_server_method(), options, FALSE))
return FALSE;
if (SSL_use_RSAPrivateKey_file(tls->ssl, privatekey_file, SSL_FILETYPE_PEM) <= 0)
{
fprintf(stderr, "%s: SSL_CTX_use_RSAPrivateKey_file failed\n", __FUNCTION__);
fprintf(stderr, "PrivateKeyFile: %s\n", privatekey_file);
return FALSE;
}
if (SSL_use_certificate_file(tls->ssl, cert_file, SSL_FILETYPE_PEM) <= 0)
{
fprintf(stderr, "%s: SSL_use_certificate_file failed\n", __FUNCTION__);
return FALSE;
}
return tls_do_handshake(tls, FALSE) > 0;
}
BOOL tls_disconnect(rdpTls* tls)
{
if (!tls)
return FALSE;
if (!tls->ssl)
return TRUE;
if (tls->alertDescription != TLS_ALERT_DESCRIPTION_CLOSE_NOTIFY)
{
/**
* OpenSSL doesn't really expose an API for sending a TLS alert manually.
*
* The following code disables the sending of the default "close notify"
* and then proceeds to force sending a custom TLS alert before shutting down.
*
* Manually sending a TLS alert is necessary in certain cases,
* like when server-side NLA results in an authentication failure.
*/
SSL_set_quiet_shutdown(tls->ssl, 1);
if ((tls->alertLevel == TLS_ALERT_LEVEL_FATAL) && (tls->ssl->session))
SSL_CTX_remove_session(tls->ssl->ctx, tls->ssl->session);
tls->ssl->s3->alert_dispatch = 1;
tls->ssl->s3->send_alert[0] = tls->alertLevel;
tls->ssl->s3->send_alert[1] = tls->alertDescription;
if (tls->ssl->s3->wbuf.left == 0)
tls->ssl->method->ssl_dispatch_alert(tls->ssl);
SSL_shutdown(tls->ssl);
}
else
{
SSL_shutdown(tls->ssl);
}
return TRUE;
}
BIO *findBufferedBio(BIO *front)
{
BIO *ret = front;
while (ret)
{
if (BIO_method_type(ret) == BIO_TYPE_BUFFERED)
return ret;
ret = ret->next_bio;
}
return ret;
}
int tls_write_all(rdpTls* tls, const BYTE* data, int length)
{
int status, nchunks, commitedBytes;
rdpTcp *tcp;
fd_set rset, wset;
fd_set *rsetPtr, *wsetPtr;
struct timeval tv;
BIO *bio = tls->bio;
DataChunk chunks[2];
BIO *bufferedBio = findBufferedBio(bio);
if (!bufferedBio)
{
fprintf(stderr, "%s: error unable to retrieve the bufferedBio in the BIO chain\n", __FUNCTION__);
return -1;
}
tcp = (rdpTcp *)bufferedBio->ptr;
do
{
status = BIO_write(bio, data, length);
/*fprintf(stderr, "%s: BIO_write(len=%d) = %d (retry=%d)\n", __FUNCTION__, length, status, BIO_should_retry(bio));*/
if (status > 0)
break;
if (!BIO_should_retry(bio))
return -1;
/* we try to handle SSL want_read and want_write nicely */
rsetPtr = wsetPtr = 0;
if (tcp->writeBlocked)
{
wsetPtr = &wset;
FD_ZERO(&wset);
FD_SET(tcp->sockfd, &wset);
}
else if (tcp->readBlocked)
{
rsetPtr = &rset;
FD_ZERO(&rset);
FD_SET(tcp->sockfd, &rset);
}
else
{
fprintf(stderr, "%s: weird we're blocked but the underlying is not read or write blocked !\n", __FUNCTION__);
USleep(10);
continue;
}
tv.tv_sec = 0;
tv.tv_usec = 100 * 1000;
status = select(tcp->sockfd + 1, rsetPtr, wsetPtr, NULL, &tv);
if (status < 0)
return -1;
}
while (TRUE);
/* make sure the output buffer is empty */
commitedBytes = 0;
while ((nchunks = ringbuffer_peek(&tcp->xmitBuffer, chunks, ringbuffer_used(&tcp->xmitBuffer))))
{
int i;
for (i = 0; i < nchunks; i++)
{
while (chunks[i].size)
{
status = BIO_write(tcp->socketBio, chunks[i].data, chunks[i].size);
if (status > 0)
{
chunks[i].size -= status;
chunks[i].data += status;
commitedBytes += status;
continue;
}
if (!BIO_should_retry(tcp->socketBio))
goto out_fail;
FD_ZERO(&rset);
FD_SET(tcp->sockfd, &rset);
tv.tv_sec = 0;
tv.tv_usec = 100 * 1000;
status = select(tcp->sockfd + 1, &rset, NULL, NULL, &tv);
if (status < 0)
goto out_fail;
}
}
}
ringbuffer_commit_read_bytes(&tcp->xmitBuffer, commitedBytes);
return length;
out_fail:
ringbuffer_commit_read_bytes(&tcp->xmitBuffer, commitedBytes);
return -1;
}
int tls_set_alert_code(rdpTls* tls, int level, int description)
{
tls->alertLevel = level;
tls->alertDescription = description;
return 0;
}
BOOL tls_match_hostname(char *pattern, int pattern_length, char *hostname)
{
if (strlen(hostname) == pattern_length)
{
if (memcmp((void*) hostname, (void*) pattern, pattern_length) == 0)
return TRUE;
}
if ((pattern_length > 2) && (pattern[0] == '*') && (pattern[1] == '.') && (((int) strlen(hostname)) >= pattern_length))
{
char* check_hostname = &hostname[strlen(hostname) - pattern_length + 1];
if (memcmp((void*) check_hostname, (void*) &pattern[1], pattern_length - 1) == 0)
{
return TRUE;
}
}
return FALSE;
}
int tls_verify_certificate(rdpTls* tls, CryptoCert cert, char* hostname, int port)
{
int match;
int index;
char* common_name = NULL;
int common_name_length = 0;
char** alt_names = NULL;
int alt_names_count = 0;
int* alt_names_lengths = NULL;
BOOL certificate_status;
BOOL hostname_match = FALSE;
BOOL verification_status = FALSE;
rdpCertificateData* certificate_data;
if (tls->settings->ExternalCertificateManagement)
{
BIO* bio;
int status;
int length;
int offset;
BYTE* pemCert;
freerdp* instance = (freerdp*) tls->settings->instance;
/**
* Don't manage certificates internally, leave it up entirely to the external client implementation
*/
bio = BIO_new(BIO_s_mem());
if (!bio)
{
fprintf(stderr, "%s: BIO_new() failure\n", __FUNCTION__);
return -1;
}
status = PEM_write_bio_X509(bio, cert->px509);
if (status < 0)
{
fprintf(stderr, "%s: PEM_write_bio_X509 failure: %d\n", __FUNCTION__, status);
return -1;
}
offset = 0;
length = 2048;
pemCert = (BYTE*) malloc(length + 1);
status = BIO_read(bio, pemCert, length);
if (status < 0)
{
fprintf(stderr, "%s: failed to read certificate\n", __FUNCTION__);
return -1;
}
offset += status;
while (offset >= length)
{
length *= 2;
pemCert = (BYTE*) realloc(pemCert, length + 1);
status = BIO_read(bio, &pemCert[offset], length);
if (status < 0)
break;
offset += status;
}
if (status < 0)
{
fprintf(stderr, "%s: failed to read certificate\n", __FUNCTION__);
return -1;
}
length = offset;
pemCert[length] = '\0';
status = -1;
if (instance->VerifyX509Certificate)
{
status = instance->VerifyX509Certificate(instance, pemCert, length, hostname, port, tls->isGatewayTransport);
}
fprintf(stderr, "%s: (length = %d) status: %d\n%s\n", __FUNCTION__, length, status, pemCert);
free(pemCert);
BIO_free(bio);
if (status < 0)
return -1;
return (status == 0) ? 0 : 1;
}
/* ignore certificate verification if user explicitly required it (discouraged) */
if (tls->settings->IgnoreCertificate)
return 1; /* success! */
/* if user explicitly specified a certificate name, use it instead of the hostname */
if (tls->settings->CertificateName)
hostname = tls->settings->CertificateName;
/* attempt verification using OpenSSL and the ~/.freerdp/certs certificate store */
certificate_status = x509_verify_certificate(cert, tls->certificate_store->path);
/* verify certificate name match */
certificate_data = crypto_get_certificate_data(cert->px509, hostname);
/* extra common name and alternative names */
common_name = crypto_cert_subject_common_name(cert->px509, &common_name_length);
alt_names = crypto_cert_subject_alt_name(cert->px509, &alt_names_count, &alt_names_lengths);
/* compare against common name */
if (common_name)
{
if (tls_match_hostname(common_name, common_name_length, hostname))
hostname_match = TRUE;
}
/* compare against alternative names */
if (alt_names)
{
for (index = 0; index < alt_names_count; index++)
{
if (tls_match_hostname(alt_names[index], alt_names_lengths[index], hostname))
{
hostname_match = TRUE;
break;
}
}
}
/* if the certificate is valid and the certificate name matches, verification succeeds */
if (certificate_status && hostname_match)
{
if (common_name)
{
free(common_name);
common_name = NULL;
}
verification_status = TRUE; /* success! */
}
/* if the certificate is valid but the certificate name does not match, warn user, do not accept */
if (certificate_status && !hostname_match)
tls_print_certificate_name_mismatch_error(hostname, common_name, alt_names, alt_names_count);
/* verification could not succeed with OpenSSL, use known_hosts file and prompt user for manual verification */
if (!certificate_status)
{
char* issuer;
char* subject;
char* fingerprint;
freerdp* instance = (freerdp*) tls->settings->instance;
BOOL accept_certificate = FALSE;
issuer = crypto_cert_issuer(cert->px509);
subject = crypto_cert_subject(cert->px509);
fingerprint = crypto_cert_fingerprint(cert->px509);
/* search for matching entry in known_hosts file */
match = certificate_data_match(tls->certificate_store, certificate_data);
if (match == 1)
{
/* no entry was found in known_hosts file, prompt user for manual verification */
if (!hostname_match)
tls_print_certificate_name_mismatch_error(hostname, common_name, alt_names, alt_names_count);
if (instance->VerifyCertificate)
{
accept_certificate = instance->VerifyCertificate(instance, subject, issuer, fingerprint);
}
if (!accept_certificate)
{
/* user did not accept, abort and do not add entry in known_hosts file */
verification_status = FALSE; /* failure! */
}
else
{
/* user accepted certificate, add entry in known_hosts file */
certificate_data_print(tls->certificate_store, certificate_data);
verification_status = TRUE; /* success! */
}
}
else if (match == -1)
{
/* entry was found in known_hosts file, but fingerprint does not match. ask user to use it */
tls_print_certificate_error(hostname, fingerprint, tls->certificate_store->file);
if (instance->VerifyChangedCertificate)
{
accept_certificate = instance->VerifyChangedCertificate(instance, subject, issuer, fingerprint, "");
}
if (!accept_certificate)
{
/* user did not accept, abort and do not change known_hosts file */
verification_status = FALSE; /* failure! */
}
else
{
/* user accepted new certificate, add replace fingerprint for this host in known_hosts file */
certificate_data_replace(tls->certificate_store, certificate_data);
verification_status = TRUE; /* success! */
}
}
else if (match == 0)
{
verification_status = TRUE; /* success! */
}
free(issuer);
free(subject);
free(fingerprint);
}
if (certificate_data)
{
free(certificate_data->fingerprint);
free(certificate_data->hostname);
free(certificate_data);
}
#ifndef _WIN32
if (common_name)
free(common_name);
#endif
if (alt_names)
crypto_cert_subject_alt_name_free(alt_names_count, alt_names_lengths,
alt_names);
return (verification_status == 0) ? 0 : 1;
}
void tls_print_certificate_error(char* hostname, char* fingerprint, char *hosts_file)
{
fprintf(stderr, "The host key for %s has changed\n", hostname);
fprintf(stderr, "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n");
fprintf(stderr, "@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @\n");
fprintf(stderr, "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n");
fprintf(stderr, "IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!\n");
fprintf(stderr, "Someone could be eavesdropping on you right now (man-in-the-middle attack)!\n");
fprintf(stderr, "It is also possible that a host key has just been changed.\n");
fprintf(stderr, "The fingerprint for the host key sent by the remote host is\n%s\n", fingerprint);
fprintf(stderr, "Please contact your system administrator.\n");
fprintf(stderr, "Add correct host key in %s to get rid of this message.\n", hosts_file);
fprintf(stderr, "Host key for %s has changed and you have requested strict checking.\n", hostname);
fprintf(stderr, "Host key verification failed.\n");
}
void tls_print_certificate_name_mismatch_error(char* hostname, char* common_name, char** alt_names, int alt_names_count)
{
int index;
assert(NULL != hostname);
fprintf(stderr, "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n");
fprintf(stderr, "@ WARNING: CERTIFICATE NAME MISMATCH! @\n");
fprintf(stderr, "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n");
fprintf(stderr, "The hostname used for this connection (%s) \n", hostname);
fprintf(stderr, "does not match %s given in the certificate:\n", alt_names_count < 1 ? "the name" : "any of the names");
fprintf(stderr, "Common Name (CN):\n");
fprintf(stderr, "\t%s\n", common_name ? common_name : "no CN found in certificate");
if (alt_names_count > 0)
{
assert(NULL != alt_names);
fprintf(stderr, "Alternative names:\n");
for (index = 0; index < alt_names_count; index++)
{
assert(alt_names[index]);
fprintf(stderr, "\t %s\n", alt_names[index]);
}
}
fprintf(stderr, "A valid certificate for the wrong name should NOT be trusted!\n");
}
rdpTls* tls_new(rdpSettings* settings)
{
rdpTls* tls;
tls = (rdpTls*) calloc(1, sizeof(rdpTls));
if (!tls)
return NULL;
SSL_load_error_strings();
SSL_library_init();
tls->settings = settings;
tls->certificate_store = certificate_store_new(settings);
if (!tls->certificate_store)
goto out_free;
tls->alertLevel = TLS_ALERT_LEVEL_WARNING;
tls->alertDescription = TLS_ALERT_DESCRIPTION_CLOSE_NOTIFY;
return tls;
out_free:
free(tls);
return NULL;
}
void tls_free(rdpTls* tls)
{
if (!tls)
return;
if (tls->ctx)
{
SSL_CTX_free(tls->ctx);
tls->ctx = NULL;
}
if (tls->PublicKey)
{
free(tls->PublicKey);
tls->PublicKey = NULL;
}
if (tls->Bindings)
{
free(tls->Bindings->Bindings);
free(tls->Bindings);
tls->Bindings = NULL;
}
certificate_store_free(tls->certificate_store);
tls->certificate_store = NULL;
free(tls);
}
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