chromeos/cryptohome/async_method_caller.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROMEOS_CRYPTOHOME_ASYNC_METHOD_CALLER_H_
   6 #define CHROMEOS_CRYPTOHOME_ASYNC_METHOD_CALLER_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/callback_forward.h"
  12 #include "chromeos/attestation/attestation_constants.h"
  13 #include "chromeos/chromeos_export.h"
  14 #include "chromeos/dbus/cryptohome_client.h"
  15 #include "third_party/cros_system_api/dbus/service_constants.h"
  16
  17 namespace cryptohome {
  18
  19 // Note: This file is placed in ::cryptohome instead of ::chromeos::cryptohome
  20 // since there is already a namespace ::cryptohome which holds the error code
  21 // enum (MountError) and referencing ::chromeos::cryptohome and ::cryptohome
  22 // within the same code is confusing.
  23
  24 // Flags for the AsyncMount method.
  25 enum MountFlags {
  26     MOUNT_FLAGS_NONE = 0,       // Used to explicitly denote that no flags are
  27                                 // set.
  28     CREATE_IF_MISSING = 1,      // Create a cryptohome if it does not exist yet.
  29     ENSURE_EPHEMERAL = 1 << 1,  // Ensure that the mount is ephemeral.
  30 };
  31
  32 // This class manages calls to Cryptohome service's 'async' methods.
  33 class CHROMEOS_EXPORT AsyncMethodCaller {
  34  public:
  35   // A callback type which is called back on the UI thread when the results of
  36   // method calls are ready.
  37   typedef base::Callback<void(bool success, MountError return_code)> Callback;
  38   typedef base::Callback<void(bool success, const std::string& data)>
  39       DataCallback;
  40
  41   virtual ~AsyncMethodCaller() {}
  42
  43   // Asks cryptohomed to asynchronously try to find the cryptohome for
  44   // |user_email| and then use |passhash| to unlock the key.
  45   // |callback| will be called with status info on completion.
  46   virtual void AsyncCheckKey(const std::string& user_email,
  47                              const std::string& passhash,
  48                              Callback callback) = 0;
  49
  50   // Asks cryptohomed to asynchronously try to find the cryptohome for
  51   // |user_email| and then change from using |old_hash| to lock the
  52   // key to using |new_hash|.
  53   // |callback| will be called with status info on completion.
  54   virtual void AsyncMigrateKey(const std::string& user_email,
  55                                const std::string& old_hash,
  56                                const std::string& new_hash,
  57                                Callback callback) = 0;
  58
  59   // Asks cryptohomed to asynchronously try to find the cryptohome for
  60   // |user_email| and then mount it using |passhash| to unlock the key.
  61   // The |flags| are a combination of |MountFlags|:
  62   // * CREATE_IF_MISSING Controls whether or not cryptohomed is asked to create
  63   //                     a new cryptohome if one does not exist yet for
  64   //                     |user_email|.
  65   // * ENSURE_EPHEMERAL  If |true|, the mounted cryptohome will be backed by
  66   //                     tmpfs. If |false|, the ephemeral users policy decides
  67   //                     whether tmpfs or an encrypted directory is used as the
  68   //                     backend.
  69   // |callback| will be called with status info on completion.
  70   // If the |CREATE_IF_MISSING| flag is not given and no cryptohome exists
  71   // for |user_email|, the expected result is
  72   // callback.Run(false, kCryptohomeMountErrorUserDoesNotExist). Otherwise,
  73   // the normal range of return codes is expected.
  74   virtual void AsyncMount(const std::string& user_email,
  75                           const std::string& passhash,
  76                           int flags,
  77                           Callback callback) = 0;
  78
  79   // Asks cryptohomed to asynchronously try to add another |new_passhash| for
  80   // |user_email| using |passhash| to unlock the key.
  81   // |callback| will be called with status info on completion.
  82   virtual void AsyncAddKey(const std::string& user_email,
  83                            const std::string& passhash,
  84                            const std::string& new_passhash,
  85                            Callback callback) = 0;
  86
  87   // Asks cryptohomed to asynchronously to mount a tmpfs for guest mode.
  88   // |callback| will be called with status info on completion.
  89   virtual void AsyncMountGuest(Callback callback) = 0;
  90
  91   // Asks cryptohomed to asynchrounously try to find the cryptohome for
  92   // |public_mount_id| and then mount it using a passhash derived from
  93   // |public_mount_id| and a secret. See AsyncMount for possible values for
  94   // |flags|.
  95   virtual void AsyncMountPublic(const std::string& public_mount_id,
  96                                 int flags,
  97                                 Callback callback) = 0;
  98
  99   // Asks cryptohomed to asynchronously try to find the cryptohome for
 100   // |user_email| and then nuke it.
 101   virtual void AsyncRemove(const std::string& user_email,
 102                            Callback callback) = 0;
 103
 104   // Asks cryptohomed to asynchronously create an attestation enrollment
 105   // request.  On success the data sent to |callback| is a request to be sent
 106   // to the Privacy CA.
 107   virtual void AsyncTpmAttestationCreateEnrollRequest(
 108       const DataCallback& callback) = 0;
 109
 110   // Asks cryptohomed to asynchronously finish an attestation enrollment.
 111   // |pca_response| is the response to the enrollment request emitted by the
 112   // Privacy CA.
 113   virtual void AsyncTpmAttestationEnroll(const std::string& pca_response,
 114                                          const Callback& callback) = 0;
 115
 116   // Asks cryptohomed to asynchronously create an attestation certificate
 117   // request according to |certificate_profile|.  Some profiles require that the
 118   // |user_email| of the currently active user and an identifier of the
 119   // |request_origin| be provided.  On success the data sent to |callback| is a
 120   // request to be sent to the Privacy CA.  The |request_origin| may be sent to
 121   // the Privacy CA but the |user_email| will never be sent.
 122   virtual void AsyncTpmAttestationCreateCertRequest(
 123       chromeos::attestation::AttestationCertificateProfile certificate_profile,
 124       const std::string& user_email,
 125       const std::string& request_origin,
 126       const DataCallback& callback) = 0;
 127
 128   // Asks cryptohomed to asynchronously finish an attestation certificate
 129   // request.  On success the data sent to |callback| is a certificate chain
 130   // in PEM format.  |pca_response| is the response to the certificate request
 131   // emitted by the Privacy CA.  |key_type| determines whether the certified key
 132   // is to be associated with the current user.  |key_name| is a name for the
 133   // key.
 134   virtual void AsyncTpmAttestationFinishCertRequest(
 135       const std::string& pca_response,
 136       chromeos::attestation::AttestationKeyType key_type,
 137       const std::string& key_name,
 138       const DataCallback& callback) = 0;
 139
 140   // Asks cryptohomed to asynchronously register the attestation key specified
 141   // by |key_type| and |key_name|.
 142   virtual void TpmAttestationRegisterKey(
 143       chromeos::attestation::AttestationKeyType key_type,
 144       const std::string& key_name,
 145       const Callback& callback) = 0;
 146
 147   // Asks cryptohomed to asynchronously sign an enterprise challenge with the
 148   // key specified by |key_type| and |key_name|.  The |domain| and |device_id|
 149   // parameters will be included in the challenge response.  |challenge| must be
 150   // a valid enterprise challenge.  On success, the data sent to |callback| is
 151   // the challenge response.
 152   virtual void TpmAttestationSignEnterpriseChallenge(
 153       chromeos::attestation::AttestationKeyType key_type,
 154       const std::string& key_name,
 155       const std::string& domain,
 156       const std::string& device_id,
 157       chromeos::attestation::AttestationChallengeOptions options,
 158       const std::string& challenge,
 159       const DataCallback& callback) = 0;
 160
 161   // Asks cryptohomed to asynchronously sign a simple challenge with the key
 162   // specified by |key_type| and |key_name|.  |challenge| can be any arbitrary
 163   // set of bytes.  On success, the data sent to |callback| is the challenge
 164   // response.
 165   virtual void TpmAttestationSignSimpleChallenge(
 166       chromeos::attestation::AttestationKeyType key_type,
 167       const std::string& key_name,
 168       const std::string& challenge,
 169       const DataCallback& callback) = 0;
 170
 171   // Asks cryptohome to asynchronously retrieve a string associated with given
 172   // |user| that would be used in mount path instead of |user|.
 173   // On success the data is sent to |callback|.
 174   virtual void AsyncGetSanitizedUsername(
 175       const std::string& user,
 176       const DataCallback& callback) = 0;
 177
 178   // Creates the global AsyncMethodCaller instance.
 179   static void Initialize();
 180
 181   // Similar to Initialize(), but can inject an alternative
 182   // AsyncMethodCaller such as MockAsyncMethodCaller for testing.
 183   // The injected object will be owned by the internal pointer and deleted
 184   // by Shutdown().
 185   static void InitializeForTesting(AsyncMethodCaller* async_method_caller);
 186
 187   // Destroys the global AsyncMethodCaller instance if it exists.
 188   static void Shutdown();
 189
 190   // Returns a pointer to the global AsyncMethodCaller instance.
 191   // Initialize() should already have been called.
 192   static AsyncMethodCaller* GetInstance();
 193 };
 194
 195 }  // namespace cryptohome
 196
 197 #endif  // CHROMEOS_CRYPTOHOME_ASYNC_METHOD_CALLER_H_