1/*
2 *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#ifndef WEBRTC_BASE_OPENSSLIDENTITY_H_
12#define WEBRTC_BASE_OPENSSLIDENTITY_H_
13
14#include <openssl/evp.h>
15#include <openssl/x509.h>
16
17#include <string>
18
19#include "webrtc/base/common.h"
20#include "webrtc/base/scoped_ptr.h"
21#include "webrtc/base/sslidentity.h"
22
23typedef struct ssl_ctx_st SSL_CTX;
24
25namespace rtc {
26
27// OpenSSLKeyPair encapsulates an OpenSSL EVP_PKEY* keypair object,
28// which is reference counted inside the OpenSSL library.
29class OpenSSLKeyPair {
30 public:
31  explicit OpenSSLKeyPair(EVP_PKEY* pkey) : pkey_(pkey) {
32    ASSERT(pkey_ != NULL);
33  }
34
35  static OpenSSLKeyPair* Generate();
36
37  virtual ~OpenSSLKeyPair();
38
39  virtual OpenSSLKeyPair* GetReference() {
40    AddReference();
41    return new OpenSSLKeyPair(pkey_);
42  }
43
44  EVP_PKEY* pkey() const { return pkey_; }
45
46 private:
47  void AddReference();
48
49  EVP_PKEY* pkey_;
50
51  DISALLOW_EVIL_CONSTRUCTORS(OpenSSLKeyPair);
52};
53
54// OpenSSLCertificate encapsulates an OpenSSL X509* certificate object,
55// which is also reference counted inside the OpenSSL library.
56class OpenSSLCertificate : public SSLCertificate {
57 public:
58  // Caller retains ownership of the X509 object.
59  explicit OpenSSLCertificate(X509* x509) : x509_(x509) {
60    AddReference();
61  }
62
63  static OpenSSLCertificate* Generate(OpenSSLKeyPair* key_pair,
64                                      const SSLIdentityParams& params);
65  static OpenSSLCertificate* FromPEMString(const std::string& pem_string);
66
67  virtual ~OpenSSLCertificate();
68
69  virtual OpenSSLCertificate* GetReference() const {
70    return new OpenSSLCertificate(x509_);
71  }
72
73  X509* x509() const { return x509_; }
74
75  virtual std::string ToPEMString() const;
76
77  virtual void ToDER(Buffer* der_buffer) const;
78
79  // Compute the digest of the certificate given algorithm
80  virtual bool ComputeDigest(const std::string& algorithm,
81                             unsigned char* digest,
82                             size_t size,
83                             size_t* length) const;
84
85  // Compute the digest of a certificate as an X509 *
86  static bool ComputeDigest(const X509* x509,
87                            const std::string& algorithm,
88                            unsigned char* digest,
89                            size_t size,
90                            size_t* length);
91
92  virtual bool GetSignatureDigestAlgorithm(std::string* algorithm) const;
93
94  virtual bool GetChain(SSLCertChain** chain) const {
95    // Chains are not yet supported when using OpenSSL.
96    // OpenSSLStreamAdapter::SSLVerifyCallback currently requires the remote
97    // certificate to be self-signed.
98    return false;
99  }
100
101 private:
102  void AddReference() const;
103
104  X509* x509_;
105
106  DISALLOW_EVIL_CONSTRUCTORS(OpenSSLCertificate);
107};
108
109// Holds a keypair and certificate together, and a method to generate
110// them consistently.
111class OpenSSLIdentity : public SSLIdentity {
112 public:
113  static OpenSSLIdentity* Generate(const std::string& common_name);
114  static OpenSSLIdentity* GenerateForTest(const SSLIdentityParams& params);
115  static SSLIdentity* FromPEMStrings(const std::string& private_key,
116                                     const std::string& certificate);
117  virtual ~OpenSSLIdentity() { }
118
119  virtual const OpenSSLCertificate& certificate() const {
120    return *certificate_;
121  }
122
123  virtual OpenSSLIdentity* GetReference() const {
124    return new OpenSSLIdentity(key_pair_->GetReference(),
125                               certificate_->GetReference());
126  }
127
128  // Configure an SSL context object to use our key and certificate.
129  bool ConfigureIdentity(SSL_CTX* ctx);
130
131 private:
132  OpenSSLIdentity(OpenSSLKeyPair* key_pair,
133                  OpenSSLCertificate* certificate)
134      : key_pair_(key_pair), certificate_(certificate) {
135    ASSERT(key_pair != NULL);
136    ASSERT(certificate != NULL);
137  }
138
139  static OpenSSLIdentity* GenerateInternal(const SSLIdentityParams& params);
140
141  scoped_ptr<OpenSSLKeyPair> key_pair_;
142  scoped_ptr<OpenSSLCertificate> certificate_;
143
144  DISALLOW_EVIL_CONSTRUCTORS(OpenSSLIdentity);
145};
146
147
148}  // namespace rtc
149
150#endif  // WEBRTC_BASE_OPENSSLIDENTITY_H_
151