summaryrefslogtreecommitdiffstats
blob: 97094bfa21c105dd68868a1b9e9655930a1ad8fd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
/*
 * Copyright (c) 2010 Remko Tronçon
 * Licensed under the GNU General Public License v3.
 * See Documentation/Licenses/GPLv3.txt for more information.
 */
#include <Swiften/Base/Platform.h>

#ifdef SWIFTEN_PLATFORM_WINDOWS
#include <windows.h>
#include <wincrypt.h>
#endif

#include <vector>
#include <openssl/err.h>
#include <openssl/pkcs12.h>
#include <boost/smart_ptr/make_shared.hpp>

#if defined(SWIFTEN_PLATFORM_MACOSX) && OPENSSL_VERSION_NUMBER < 0x00908000
#include <Security/Security.h>
#endif

#include <Swiften/TLS/OpenSSL/OpenSSLContext.h>
#include <Swiften/TLS/OpenSSL/OpenSSLCertificate.h>
#include <Swiften/TLS/PKCS12Certificate.h>

#pragma GCC diagnostic ignored "-Wold-style-cast"

namespace Swift {

static const int MAX_FINISHED_SIZE = 4096;
static const int SSL_READ_BUFFERSIZE = 8192;

void freeX509Stack(STACK_OF(X509)* stack) {
	sk_X509_free(stack);
}

OpenSSLContext::OpenSSLContext() : state_(Start), context_(0), handle_(0), readBIO_(0), writeBIO_(0) {
	ensureLibraryInitialized();
	context_ = SSL_CTX_new(TLSv1_client_method());

	// Load system certs
#if defined(SWIFTEN_PLATFORM_WINDOWS)
	X509_STORE* store = SSL_CTX_get_cert_store(context_);
	HCERTSTORE systemStore = CertOpenSystemStore(0, "ROOT");
	if (systemStore) {
		PCCERT_CONTEXT certContext = NULL;
		while (true) {
			certContext = CertFindCertificateInStore(systemStore, X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, 0, CERT_FIND_ANY, NULL, certContext);
			if (!certContext) {
				break;
			}
			OpenSSLCertificate cert(createByteArray(certContext->pbCertEncoded, certContext->cbCertEncoded));
			if (store && cert.getInternalX509()) {
				X509_STORE_add_cert(store, cert.getInternalX509().get());
			}
		}
	}
#elif !defined(SWIFTEN_PLATFORM_MACOSX)
	SSL_CTX_load_verify_locations(context_, NULL, "/etc/ssl/certs");
#elif defined(SWIFTEN_PLATFORM_MACOSX) && OPENSSL_VERSION_NUMBER < 0x00908000
	// On Mac OS X 10.5 (OpenSSL < 0.9.8), OpenSSL does not automatically look in the system store.
	// We therefore add all certs from the system store ourselves.
	X509_STORE* store = SSL_CTX_get_cert_store(context_);
	CFArrayRef anchorCertificates;
	if (SecTrustCopyAnchorCertificates(&anchorCertificates) == 0) {
		for (int i = 0; i < CFArrayGetCount(anchorCertificates); ++i) {
			SecCertificateRef cert = reinterpret_cast<SecCertificateRef>(const_cast<void*>(CFArrayGetValueAtIndex(anchorCertificates, i)));
			CSSM_DATA certCSSMData;
			if (SecCertificateGetData(cert, &certCSSMData) != 0 || certCSSMData.Length == 0) {
				continue;
			}
			std::vector<unsigned char> certData;
			certData.resize(certCSSMData.Length);
			memcpy(&certData[0], certCSSMData.Data, certCSSMData.Length);
			OpenSSLCertificate certificate(certData);
			if (store && certificate.getInternalX509()) {
				X509_STORE_add_cert(store, certificate.getInternalX509().get());
			}
		}
		CFRelease(anchorCertificates);
	}
#endif
}

OpenSSLContext::~OpenSSLContext() {
	SSL_free(handle_);
	SSL_CTX_free(context_);
}

void OpenSSLContext::ensureLibraryInitialized() {
	static bool isLibraryInitialized = false;
	if (!isLibraryInitialized) {
		SSL_load_error_strings();
		SSL_library_init();
		OpenSSL_add_all_algorithms();

		// Disable compression
		/*
		STACK_OF(SSL_COMP)* compressionMethods = SSL_COMP_get_compression_methods();
		sk_SSL_COMP_zero(compressionMethods);*/

		isLibraryInitialized = true;
	}
}

void OpenSSLContext::connect() {
	handle_ = SSL_new(context_);
	// Ownership of BIOs is ransferred
	readBIO_ = BIO_new(BIO_s_mem());
	writeBIO_ = BIO_new(BIO_s_mem());
	SSL_set_bio(handle_, readBIO_, writeBIO_);

	state_ = Connecting;
	doConnect();
}

void OpenSSLContext::doConnect() {
	int connectResult = SSL_connect(handle_);
	int error = SSL_get_error(handle_, connectResult);
	switch (error) {
		case SSL_ERROR_NONE: {
			state_ = Connected;
			//std::cout << x->name << std::endl;
			//const char* comp = SSL_get_current_compression(handle_);
			//std::cout << "Compression: " << SSL_COMP_get_name(comp) << std::endl;
			onConnected();
			break;
		}
		case SSL_ERROR_WANT_READ:
			sendPendingDataToNetwork();
			break;
		default:
			state_ = Error;
			onError();
	}
}

void OpenSSLContext::sendPendingDataToNetwork() {
	int size = BIO_pending(writeBIO_);
	if (size > 0) {
		ByteArray data;
		data.resize(size);
		BIO_read(writeBIO_, vecptr(data), size);
		onDataForNetwork(data);
	}
}

void OpenSSLContext::handleDataFromNetwork(const ByteArray& data) {
	BIO_write(readBIO_, vecptr(data), data.size());
	switch (state_) {
		case Connecting:
			doConnect();
			break;
		case Connected:
			sendPendingDataToApplication();
			break;
		case Start: assert(false); break;
		case Error: /*assert(false);*/ break;
	}
}

void OpenSSLContext::handleDataFromApplication(const ByteArray& data) {
	if (SSL_write(handle_, vecptr(data), data.size()) >= 0) {
		sendPendingDataToNetwork();
	}
	else {
		state_ = Error;
		onError();
	}
}

void OpenSSLContext::sendPendingDataToApplication() {
	ByteArray data;
	data.resize(SSL_READ_BUFFERSIZE);
	int ret = SSL_read(handle_, vecptr(data), data.size());
	while (ret > 0) {
		data.resize(ret);
		onDataForApplication(data);
		data.resize(SSL_READ_BUFFERSIZE);
		ret = SSL_read(handle_, vecptr(data), data.size());
	}
	if (ret < 0 && SSL_get_error(handle_, ret) != SSL_ERROR_WANT_READ) {
		state_ = Error;
		onError();
	}
}

bool OpenSSLContext::setClientCertificate(const PKCS12Certificate& certificate) {
	if (certificate.isNull()) {
		return false;
	}

	// Create a PKCS12 structure
	BIO* bio = BIO_new(BIO_s_mem());
	BIO_write(bio, vecptr(certificate.getData()), certificate.getData().size());
	boost::shared_ptr<PKCS12> pkcs12(d2i_PKCS12_bio(bio, NULL), PKCS12_free);
	BIO_free(bio);
	if (!pkcs12) {
		return false;
	}

	// Parse PKCS12
	X509 *certPtr = 0;
	EVP_PKEY* privateKeyPtr = 0;
	STACK_OF(X509)* caCertsPtr = 0;
	int result = PKCS12_parse(pkcs12.get(), certificate.getPassword().c_str(), &privateKeyPtr, &certPtr, &caCertsPtr);
	if (result != 1) { 
		return false;
	}
	boost::shared_ptr<X509> cert(certPtr, X509_free);
	boost::shared_ptr<EVP_PKEY> privateKey(privateKeyPtr, EVP_PKEY_free);
	boost::shared_ptr<STACK_OF(X509)> caCerts(caCertsPtr, freeX509Stack);

	// Use the key & certificates
	if (SSL_CTX_use_certificate(context_, cert.get()) != 1) {
		return false;
	}
	if (SSL_CTX_use_PrivateKey(context_, privateKey.get()) != 1) {
		return false;
	}
	for (int i = 0;  i < sk_X509_num(caCerts.get()); ++i) {
		SSL_CTX_add_extra_chain_cert(context_, sk_X509_value(caCerts.get(), i));
	}
	return true;
}

Certificate::ref OpenSSLContext::getPeerCertificate() const {
	boost::shared_ptr<X509> x509Cert(SSL_get_peer_certificate(handle_), X509_free);
	if (x509Cert) {
		return boost::make_shared<OpenSSLCertificate>(x509Cert);
	}
	else {
		return Certificate::ref();
	}
}

boost::shared_ptr<CertificateVerificationError> OpenSSLContext::getPeerCertificateVerificationError() const {
	int verifyResult = SSL_get_verify_result(handle_);
	if (verifyResult != X509_V_OK) {
		return boost::make_shared<CertificateVerificationError>(getVerificationErrorTypeForResult(verifyResult));
	}
	else {
		return boost::shared_ptr<CertificateVerificationError>();
	}
}

ByteArray OpenSSLContext::getFinishMessage() const {
	ByteArray data;
	data.resize(MAX_FINISHED_SIZE);
	size_t size = SSL_get_finished(handle_, vecptr(data), data.size());
	data.resize(size);
	return data;
}

CertificateVerificationError::Type OpenSSLContext::getVerificationErrorTypeForResult(int result) {
	assert(result != 0);
	switch (result) {
		case X509_V_ERR_CERT_NOT_YET_VALID:
		case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
			return CertificateVerificationError::NotYetValid;

		case X509_V_ERR_CERT_HAS_EXPIRED:
		case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
			return CertificateVerificationError::Expired;

		case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
		case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
			return CertificateVerificationError::SelfSigned;

		case X509_V_ERR_CERT_UNTRUSTED:
			return CertificateVerificationError::Untrusted;

		case X509_V_ERR_CERT_REJECTED:
			return CertificateVerificationError::Rejected;

		case X509_V_ERR_INVALID_PURPOSE:
			return CertificateVerificationError::InvalidPurpose;

		case X509_V_ERR_PATH_LENGTH_EXCEEDED:
			return CertificateVerificationError::PathLengthExceeded;

		case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
		case X509_V_ERR_CERT_SIGNATURE_FAILURE:
		case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
			return CertificateVerificationError::InvalidSignature;

		case X509_V_ERR_INVALID_CA:
		case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
		case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
		case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
			return CertificateVerificationError::InvalidCA;

		case X509_V_ERR_SUBJECT_ISSUER_MISMATCH:
		case X509_V_ERR_AKID_SKID_MISMATCH:
		case X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH:
		case X509_V_ERR_KEYUSAGE_NO_CERTSIGN:
			return CertificateVerificationError::UnknownError;

		// Unused / should not happen
		case X509_V_ERR_CERT_REVOKED:
		case X509_V_ERR_OUT_OF_MEM:
		case X509_V_ERR_UNABLE_TO_GET_CRL:
		case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
		case X509_V_ERR_CRL_SIGNATURE_FAILURE:
		case X509_V_ERR_CRL_NOT_YET_VALID:
		case X509_V_ERR_CRL_HAS_EXPIRED:
		case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
		case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
		case X509_V_ERR_CERT_CHAIN_TOO_LONG:
		case X509_V_ERR_APPLICATION_VERIFICATION:
		default:
			return CertificateVerificationError::UnknownError;
	}
}

}