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/*
* libjingle
* Copyright 2004, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// Handling of certificates and keypairs for SSLStreamAdapter's peer mode.
#ifndef TALK_BASE_SSLIDENTITY_H_
#define TALK_BASE_SSLIDENTITY_H_
#include <algorithm>
#include <string>
#include <vector>
#include "talk/base/buffer.h"
#include "talk/base/messagedigest.h"
namespace talk_base {
// Forward declaration due to circular dependency with SSLCertificate.
class SSLCertChain;
// Abstract interface overridden by SSL library specific
// implementations.
// A somewhat opaque type used to encapsulate a certificate.
// Wraps the SSL library's notion of a certificate, with reference counting.
// The SSLCertificate object is pretty much immutable once created.
// (The OpenSSL implementation only does reference counting and
// possibly caching of intermediate results.)
class SSLCertificate {
public:
// Parses and build a certificate from a PEM encoded string.
// Returns NULL on failure.
// The length of the string representation of the certificate is
// stored in *pem_length if it is non-NULL, and only if
// parsing was successful.
// Caller is responsible for freeing the returned object.
static SSLCertificate* FromPEMString(const std::string& pem_string);
virtual ~SSLCertificate() {}
// Returns a new SSLCertificate object instance wrapping the same
// underlying certificate, including its chain if present.
// Caller is responsible for freeing the returned object.
virtual SSLCertificate* GetReference() const = 0;
// Provides the cert chain, or returns false. The caller owns the chain.
// The chain includes a copy of each certificate, excluding the leaf.
virtual bool GetChain(SSLCertChain** chain) const = 0;
// Returns a PEM encoded string representation of the certificate.
virtual std::string ToPEMString() const = 0;
// Provides a DER encoded binary representation of the certificate.
virtual void ToDER(Buffer* der_buffer) const = 0;
// Gets the name of the digest algorithm that was used to compute this
// certificate's signature.
virtual bool GetSignatureDigestAlgorithm(std::string* algorithm) const = 0;
// Compute the digest of the certificate given algorithm
virtual bool ComputeDigest(const std::string &algorithm,
unsigned char* digest, std::size_t size,
std::size_t* length) const = 0;
};
// SSLCertChain is a simple wrapper for a vector of SSLCertificates. It serves
// primarily to ensure proper memory management (especially deletion) of the
// SSLCertificate pointers.
class SSLCertChain {
public:
// These constructors copy the provided SSLCertificate(s), so the caller
// retains ownership.
explicit SSLCertChain(const std::vector<SSLCertificate*>& certs) {
ASSERT(!certs.empty());
certs_.resize(certs.size());
std::transform(certs.begin(), certs.end(), certs_.begin(), DupCert);
}
explicit SSLCertChain(const SSLCertificate* cert) {
certs_.push_back(cert->GetReference());
}
~SSLCertChain() {
std::for_each(certs_.begin(), certs_.end(), DeleteCert);
}
// Vector access methods.
size_t GetSize() const { return certs_.size(); }
// Returns a temporary reference, only valid until the chain is destroyed.
const SSLCertificate& Get(size_t pos) const { return *(certs_[pos]); }
// Returns a new SSLCertChain object instance wrapping the same underlying
// certificate chain. Caller is responsible for freeing the returned object.
SSLCertChain* Copy() const {
return new SSLCertChain(certs_);
}
private:
// Helper function for duplicating a vector of certificates.
static SSLCertificate* DupCert(const SSLCertificate* cert) {
return cert->GetReference();
}
// Helper function for deleting a vector of certificates.
static void DeleteCert(SSLCertificate* cert) { delete cert; }
std::vector<SSLCertificate*> certs_;
DISALLOW_COPY_AND_ASSIGN(SSLCertChain);
};
// 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 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.
// Returns NULL on failure.
// Caller is responsible for freeing the returned object.
static SSLIdentity* Generate(const std::string& common_name);
// Construct an identity from a private key and a certificate.
static SSLIdentity* FromPEMStrings(const std::string& private_key,
const std::string& certificate);
virtual ~SSLIdentity() {}
// Returns a new SSLIdentity object instance wrapping the same
// identity information.
// Caller is responsible for freeing the returned object.
virtual SSLIdentity* GetReference() const = 0;
// Returns a temporary reference to the certificate.
virtual const SSLCertificate& certificate() const = 0;
// Helpers for parsing converting between PEM and DER format.
static bool PemToDer(const std::string& pem_type,
const std::string& pem_string,
std::string* der);
static std::string DerToPem(const std::string& pem_type,
const unsigned char* data,
size_t length);
};
extern const char kPemTypeCertificate[];
extern const char kPemTypeRsaPrivateKey[];
} // namespace talk_base
#endif // TALK_BASE_SSLIDENTITY_H_
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