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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/cert/x509_util.h"
#include "net/cert/x509_util_openssl.h"
#include <algorithm>
#include "base/logging.h"
#include "base/strings/string_piece.h"
#include "crypto/openssl_util.h"
#include "crypto/rsa_private_key.h"
#include "net/cert/x509_cert_types.h"
namespace net {
namespace x509_util {
bool IsSupportedValidityRange(base::Time not_valid_before,
base::Time not_valid_after) {
if (not_valid_before > not_valid_after)
return false;
// The validity field of a certificate can only encode years 1-9999.
// Compute the base::Time values corresponding to Jan 1st,0001 and
// Jan 1st, 10000 respectively. Done by using the pre-computed numbers
// of days between these dates and the Unix epoch, i.e. Jan 1st, 1970,
// using the following Python script:
//
// from datetime import date as D
// print (D(1970,1,1)-D(1,1,1)) # -> 719162 days
// print (D(9999,12,31)-D(1970,1,1)) # -> 2932896 days
//
// Note: This ignores leap seconds, but should be enough in practice.
//
const int64 kDaysFromYear0001ToUnixEpoch = 719162;
const int64 kDaysFromUnixEpochToYear10000 = 2932896 + 1;
const base::Time kEpoch = base::Time::UnixEpoch();
const base::Time kYear0001 = kEpoch -
base::TimeDelta::FromDays(kDaysFromYear0001ToUnixEpoch);
const base::Time kYear10000 = kEpoch +
base::TimeDelta::FromDays(kDaysFromUnixEpochToYear10000);
if (not_valid_before < kYear0001 || not_valid_before >= kYear10000 ||
not_valid_after < kYear0001 || not_valid_after >= kYear10000)
return false;
return true;
}
bool CreateDomainBoundCertEC(
crypto::ECPrivateKey* key,
const std::string& domain,
uint32 serial_number,
base::Time not_valid_before,
base::Time not_valid_after,
std::string* der_cert) {
NOTIMPLEMENTED();
return false;
}
bool CreateSelfSignedCert(crypto::RSAPrivateKey* key,
const std::string& common_name,
uint32 serial_number,
base::Time not_valid_before,
base::Time not_valid_after,
std::string* der_encoded) {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
static const char kCommonNamePrefix[] = "CN=";
const size_t kCommonNamePrefixLen = sizeof(kCommonNamePrefix) - 1;
// Put the serial number into an OpenSSL-friendly object.
crypto::ScopedOpenSSL<ASN1_INTEGER, ASN1_INTEGER_free> asn1_serial(
ASN1_INTEGER_new());
if (!asn1_serial.get() ||
!ASN1_INTEGER_set(asn1_serial.get(), static_cast<long>(serial_number))) {
LOG(ERROR) << "Invalid serial number " << serial_number;
return false;
}
// Do the same for the time stamps.
crypto::ScopedOpenSSL<ASN1_TIME, ASN1_TIME_free> asn1_not_before_time(
ASN1_TIME_set(NULL, not_valid_before.ToTimeT()));
if (!asn1_not_before_time.get()) {
LOG(ERROR) << "Invalid not_valid_before time: "
<< not_valid_before.ToTimeT();
return false;
}
crypto::ScopedOpenSSL<ASN1_TIME, ASN1_TIME_free> asn1_not_after_time(
ASN1_TIME_set(NULL, not_valid_after.ToTimeT()));
if (!asn1_not_after_time.get()) {
LOG(ERROR) << "Invalid not_valid_after time: " << not_valid_after.ToTimeT();
return false;
}
// Because |common_name| only contains a common name and starts with 'CN=',
// there is no need for a full RFC 2253 parser here. Do some sanity checks
// though.
if (common_name.size() < kCommonNamePrefixLen ||
strncmp(common_name.c_str(), kCommonNamePrefix, kCommonNamePrefixLen)) {
LOG(ERROR) << "Common name must begin with " << kCommonNamePrefix;
return false;
}
if (common_name.size() > INT_MAX) {
LOG(ERROR) << "Common name too long";
return false;
}
unsigned char* common_name_str =
reinterpret_cast<unsigned char*>(const_cast<char*>(common_name.data())) +
kCommonNamePrefixLen;
int common_name_len =
static_cast<int>(common_name.size()) - kCommonNamePrefixLen;
crypto::ScopedOpenSSL<X509_NAME, X509_NAME_free> name(X509_NAME_new());
if (!name.get() || !X509_NAME_add_entry_by_NID(name.get(),
NID_commonName,
MBSTRING_ASC,
common_name_str,
common_name_len,
-1,
0)) {
LOG(ERROR) << "Can't parse common name: " << common_name.c_str();
return false;
}
// Now create certificate and populate it.
crypto::ScopedOpenSSL<X509, X509_free> cert(X509_new());
if (!cert.get() || !X509_set_version(cert.get(), 2L) /* i.e. version 3 */ ||
!X509_set_pubkey(cert.get(), key->key()) ||
!X509_set_serialNumber(cert.get(), asn1_serial.get()) ||
!X509_set_notBefore(cert.get(), asn1_not_before_time.get()) ||
!X509_set_notAfter(cert.get(), asn1_not_after_time.get()) ||
!X509_set_subject_name(cert.get(), name.get()) ||
!X509_set_issuer_name(cert.get(), name.get())) {
LOG(ERROR) << "Could not create certificate";
return false;
}
// Sign it with the private key.
if (!X509_sign(cert.get(), key->key(), EVP_sha1())) {
LOG(ERROR) << "Could not sign certificate with key.";
return false;
}
// Convert it into a DER-encoded string copied to |der_encoded|.
int der_data_length = i2d_X509(cert.get(), NULL);
if (der_data_length < 0)
return false;
der_encoded->resize(static_cast<size_t>(der_data_length));
unsigned char* der_data =
reinterpret_cast<unsigned char*>(&(*der_encoded)[0]);
if (i2d_X509(cert.get(), &der_data) < 0)
return false;
return true;
}
bool ParsePrincipalKeyAndValueByIndex(X509_NAME* name,
int index,
std::string* key,
std::string* value) {
X509_NAME_ENTRY* entry = X509_NAME_get_entry(name, index);
if (!entry)
return false;
if (key) {
ASN1_OBJECT* object = X509_NAME_ENTRY_get_object(entry);
key->assign(OBJ_nid2sn(OBJ_obj2nid(object)));
}
ASN1_STRING* data = X509_NAME_ENTRY_get_data(entry);
if (!data)
return false;
unsigned char* buf = NULL;
int len = ASN1_STRING_to_UTF8(&buf, data);
if (len <= 0)
return false;
value->assign(reinterpret_cast<const char*>(buf), len);
OPENSSL_free(buf);
return true;
}
bool ParsePrincipalValueByIndex(X509_NAME* name,
int index,
std::string* value) {
return ParsePrincipalKeyAndValueByIndex(name, index, NULL, value);
}
bool ParsePrincipalValueByNID(X509_NAME* name, int nid, std::string* value) {
int index = X509_NAME_get_index_by_NID(name, nid, -1);
if (index < 0)
return false;
return ParsePrincipalValueByIndex(name, index, value);
}
bool ParseDate(ASN1_TIME* x509_time, base::Time* time) {
if (!x509_time ||
(x509_time->type != V_ASN1_UTCTIME &&
x509_time->type != V_ASN1_GENERALIZEDTIME))
return false;
base::StringPiece str_date(reinterpret_cast<const char*>(x509_time->data),
x509_time->length);
CertDateFormat format = x509_time->type == V_ASN1_UTCTIME ?
CERT_DATE_FORMAT_UTC_TIME : CERT_DATE_FORMAT_GENERALIZED_TIME;
return ParseCertificateDate(str_date, format, time);
}
} // namespace x509_util
} // namespace net
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