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/*
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
// Handling of certificates and keypairs for SSLStreamAdapter's peer mode.
#ifndef RTC_BASE_SSL_IDENTITY_H_
#define RTC_BASE_SSL_IDENTITY_H_
#include <stdint.h>
#include <ctime>
#include <memory>
#include <string>
#include "absl/strings/string_view.h"
#include "rtc_base/system/rtc_export.h"
namespace rtc {
class SSLCertChain;
class SSLCertificate;
// KT_LAST is intended for vector declarations and loops over all key types;
// it does not represent any key type in itself.
// KT_DEFAULT is used as the default KeyType for KeyParams.
enum KeyType { KT_RSA, KT_ECDSA, KT_LAST, KT_DEFAULT = KT_ECDSA };
static const int kRsaDefaultModSize = 1024;
static const int kRsaDefaultExponent = 0x10001; // = 2^16+1 = 65537
static const int kRsaMinModSize = 1024;
static const int kRsaMaxModSize = 8192;
// Certificate default validity lifetime.
static const int kDefaultCertificateLifetimeInSeconds =
60 * 60 * 24 * 30; // 30 days
// Certificate validity window.
// This is to compensate for slightly incorrect system clocks.
static const int kCertificateWindowInSeconds = -60 * 60 * 24;
struct RSAParams {
unsigned int mod_size;
unsigned int pub_exp;
};
enum ECCurve { EC_NIST_P256, /* EC_FANCY, */ EC_LAST };
class RTC_EXPORT KeyParams {
public:
// Generate a KeyParams object from a simple KeyType, using default params.
explicit KeyParams(KeyType key_type = KT_DEFAULT);
// Generate a a KeyParams for RSA with explicit parameters.
static KeyParams RSA(int mod_size = kRsaDefaultModSize,
int pub_exp = kRsaDefaultExponent);
// Generate a a KeyParams for ECDSA specifying the curve.
static KeyParams ECDSA(ECCurve curve = EC_NIST_P256);
// Check validity of a KeyParams object. Since the factory functions have
// no way of returning errors, this function can be called after creation
// to make sure the parameters are OK.
bool IsValid() const;
RSAParams rsa_params() const;
ECCurve ec_curve() const;
KeyType type() const { return type_; }
private:
KeyType type_;
union {
RSAParams rsa;
ECCurve curve;
} params_;
};
// TODO(hbos): Remove once rtc::KeyType (to be modified) and
// blink::WebRTCKeyType (to be landed) match. By using this function in Chromium
// appropriately we can change KeyType enum -> class without breaking Chromium.
KeyType IntKeyTypeFamilyToKeyType(int key_type_family);
// Parameters for generating a certificate. If `common_name` is non-empty, it
// will be used for the certificate's subject and issuer name, otherwise a
// random string will be used.
struct SSLIdentityParams {
std::string common_name;
time_t not_before; // Absolute time since epoch in seconds.
time_t not_after; // Absolute time since epoch in seconds.
KeyParams key_params;
};
// Our identity in an SSL negotiation: a keypair and certificate (both
// with the same public key).
// This too is pretty much immutable once created.
class RTC_EXPORT SSLIdentity {
public:
// Generates an identity (keypair and self-signed certificate). If
// `common_name` is non-empty, it will be used for the certificate's subject
// and issuer name, otherwise a random string will be used. The key type and
// parameters are defined in `key_param`. The certificate's lifetime in
// seconds from the current time is defined in `certificate_lifetime`; it
// should be a non-negative number.
// Returns null on failure.
// Caller is responsible for freeing the returned object.
static std::unique_ptr<SSLIdentity> Create(absl::string_view common_name,
const KeyParams& key_param,
time_t certificate_lifetime);
static std::unique_ptr<SSLIdentity> Create(absl::string_view common_name,
const KeyParams& key_param);
static std::unique_ptr<SSLIdentity> Create(absl::string_view common_name,
KeyType key_type);
// Allows fine-grained control over expiration time.
static std::unique_ptr<SSLIdentity> CreateForTest(
const SSLIdentityParams& params);
// Construct an identity from a private key and a certificate.
static std::unique_ptr<SSLIdentity> CreateFromPEMStrings(
absl::string_view private_key,
absl::string_view certificate);
// Construct an identity from a private key and a certificate chain.
static std::unique_ptr<SSLIdentity> CreateFromPEMChainStrings(
absl::string_view private_key,
absl::string_view certificate_chain);
virtual ~SSLIdentity() {}
// Returns a new SSLIdentity object instance wrapping the same
// identity information.
std::unique_ptr<SSLIdentity> Clone() const { return CloneInternal(); }
// Returns a temporary reference to the end-entity (leaf) certificate.
virtual const SSLCertificate& certificate() const = 0;
// Returns a temporary reference to the entire certificate chain.
virtual const SSLCertChain& cert_chain() const = 0;
virtual std::string PrivateKeyToPEMString() const = 0;
virtual std::string PublicKeyToPEMString() const = 0;
// Helpers for parsing converting between PEM and DER format.
static bool PemToDer(absl::string_view pem_type,
absl::string_view pem_string,
std::string* der);
static std::string DerToPem(absl::string_view pem_type,
const unsigned char* data,
size_t length);
protected:
virtual std::unique_ptr<SSLIdentity> CloneInternal() const = 0;
};
bool operator==(const SSLIdentity& a, const SSLIdentity& b);
bool operator!=(const SSLIdentity& a, const SSLIdentity& b);
// Convert from ASN1 time as restricted by RFC 5280 to seconds from 1970-01-01
// 00.00 ("epoch"). If the ASN1 time cannot be read, return -1. The data at
// `s` is not 0-terminated; its char count is defined by `length`.
int64_t ASN1TimeToSec(const unsigned char* s, size_t length, bool long_format);
extern const char kPemTypeCertificate[];
extern const char kPemTypeRsaPrivateKey[];
extern const char kPemTypeEcPrivateKey[];
} // namespace rtc
#endif // RTC_BASE_SSL_IDENTITY_H_
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