[Cast Channel] Add support for nonce challenge to Cast channel authentication.

extensions/browser/api/cast_channel/cast_auth_util.h

 // Copyright 2014 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.
 
 #ifndef EXTENSIONS_BROWSER_API_CAST_CHANNEL_CAST_AUTH_UTIL_H_
 #define EXTENSIONS_BROWSER_API_CAST_CHANNEL_CAST_AUTH_UTIL_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 28 matching lines @@
     ERROR_FINGERPRINT_NOT_FOUND,
     ERROR_CERT_PARSING_FAILED,
     ERROR_CERT_NOT_SIGNED_BY_TRUSTED_CA,
     ERROR_CANNOT_EXTRACT_PUBLIC_KEY,
     ERROR_SIGNED_BLOBS_MISMATCH,
     ERROR_TLS_CERT_VALIDITY_PERIOD_TOO_LONG,
     ERROR_TLS_CERT_VALID_START_DATE_IN_FUTURE,
     ERROR_TLS_CERT_EXPIRED,
     ERROR_CRL_INVALID,
     ERROR_CERT_REVOKED,
+    ERROR_SENDER_NONCE_MISMATCH,
   };
 
   enum PolicyType { POLICY_NONE = 0, POLICY_AUDIO_ONLY = 1 << 0 };
 
   // Constructs a AuthResult that corresponds to success.
   AuthResult();
 
   AuthResult(const std::string& error_message, ErrorType error_type);
 
   ~AuthResult();
 
   static AuthResult CreateWithParseError(const std::string& error_message,
                                          ErrorType error_type);
 
   bool success() const { return error_type == ERROR_NONE; }
 
   std::string error_message;
   ErrorType error_type;
   unsigned int channel_policies;
 };
 
+class AuthContext {
+ public:
+  explicit AuthContext(const std::string& nonce);
+  ~AuthContext();
+
+  const std::string& nonce() const { return nonce_; }
+
+ private:
+  const std::string nonce_;
+  DISALLOW_COPY_AND_ASSIGN(AuthContext);
+};
+
 // Authenticates the given |challenge_reply|:
 // 1. Signature contained in the reply is valid.
 // 2. Certficate used to sign is rooted to a trusted CA.
 AuthResult AuthenticateChallengeReply(const CastMessage& challenge_reply,
-                                      const net::X509Certificate& peer_cert);
+                                      const net::X509Certificate& peer_cert,
+                                      const AuthContext* auth_context);
+
+// Performs a quick check of the TLS certificate for time validity requirements.
+AuthResult VerifyTLSCertificate(const net::X509Certificate& peer_cert,
+                                std::string* peer_cert_der,
+                                const base::Time& verification_time);
+
+// Performs a check of the nonce challenge. Returns success if |nonce_response|
+// matches |nonce|.
+AuthResult VerifySenderNonce(const std::string& nonce,
+                             const std::string& nonce_response);
 
 // Auth-library specific implementation of cryptographic signature
 // verification routines. Verifies that |response| contains a
 // valid signature of |signature_input|.
 AuthResult VerifyCredentials(const AuthResponse& response,
                              const std::string& signature_input);
 
 // Exposed for testing only.
 //
 // Overloaded version of VerifyCredentials that allows modifying
 // the crl policy, trust stores, and verification times.
 AuthResult VerifyCredentialsForTest(
     const AuthResponse& response,
     const std::string& signature_input,
     const cast_certificate::CRLPolicy& crl_policy,
     net::TrustStore* cast_trust_store,
     net::TrustStore* crl_trust_store,
     const base::Time& verification_time);
 
+// Get an auth challenge context.
+// The same context must be used in the challenge and reply.
+std::unique_ptr<AuthContext> GetChallengeContext();
+
 }  // namespace cast_channel
 }  // namespace api
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_CAST_CHANNEL_CAST_AUTH_UTIL_H_