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| 1 | +# Copyright Amazon.com Inc. or its affiliates. All Rights Reserved. |
| 2 | +# SPDX-License-Identifier: Apache-2.0 |
| 3 | +from aws_dbesdk_dynamodb.internaldafny.generated.AwsCryptographyDbEncryptionSdkDynamoDbItemEncryptorTypes import ( |
| 4 | + DynamoDbItemEncryptorConfig_DynamoDbItemEncryptorConfig, |
| 5 | + Error_DynamoDbItemEncryptorException, |
| 6 | + DecryptItemInput_DecryptItemInput, |
| 7 | + EncryptItemInput_EncryptItemInput, |
| 8 | +) |
| 9 | +from aws_dbesdk_dynamodb.internaldafny.generated.AwsCryptographyDbEncryptionSdkStructuredEncryptionTypes import ( |
| 10 | + CryptoAction_ENCRYPT__AND__SIGN, |
| 11 | + CryptoAction_SIGN__ONLY, |
| 12 | + CryptoAction_DO__NOTHING, |
| 13 | +) |
| 14 | +from aws_dbesdk_dynamodb.smithygenerated.aws_cryptography_dbencryptionsdk_dynamodb.references import ( |
| 15 | + ILegacyDynamoDbEncryptor, |
| 16 | +) |
| 17 | +import smithy_dafny_standard_library.internaldafny.generated.Wrappers as Wrappers |
| 18 | +import _dafny |
| 19 | + |
| 20 | +import aws_dbesdk_dynamodb.internaldafny.generated.InternalLegacyOverride |
| 21 | +from aws_dbesdk_dynamodb.smithygenerated.aws_cryptography_dbencryptionsdk_dynamodb_itemencryptor.models import ( |
| 22 | + EncryptItemInput, |
| 23 | + EncryptItemOutput, |
| 24 | + DecryptItemOutput, |
| 25 | + DecryptItemInput, |
| 26 | +) |
| 27 | + |
| 28 | + |
| 29 | +try: |
| 30 | + from dynamodb_encryption_sdk.encrypted.client import EncryptedClient |
| 31 | + from dynamodb_encryption_sdk.structures import EncryptionContext, AttributeActions |
| 32 | + from dynamodb_encryption_sdk.identifiers import CryptoAction |
| 33 | + from dynamodb_encryption_sdk.encrypted import CryptoConfig |
| 34 | + from dynamodb_encryption_sdk.internal.identifiers import ReservedAttributes |
| 35 | + |
| 36 | + _HAS_LEGACY_DDBEC = True |
| 37 | +except ImportError: |
| 38 | + _HAS_LEGACY_DDBEC = False |
| 39 | + |
| 40 | + |
| 41 | +class InternalLegacyOverride(aws_dbesdk_dynamodb.internaldafny.generated.InternalLegacyOverride.InternalLegacyOverride): |
| 42 | + @staticmethod |
| 43 | + def Build(config: DynamoDbItemEncryptorConfig_DynamoDbItemEncryptorConfig): |
| 44 | + if config.legacyOverride.is_None: |
| 45 | + return InternalLegacyOverride.CreateBuildSuccess(InternalLegacyOverride.CreateInternalLegacyOverrideNone()) |
| 46 | + |
| 47 | + legacy_override = config.legacyOverride.value |
| 48 | + |
| 49 | + # Precondition: The encryptor MUST be a DynamoDBEncryptor |
| 50 | + if not _HAS_LEGACY_DDBEC: |
| 51 | + return InternalLegacyOverride.CreateBuildFailure( |
| 52 | + InternalLegacyOverride.CreateError("Could not find aws-dynamodb-encryption-python installation") |
| 53 | + ) |
| 54 | + if not isinstance(legacy_override.encryptor, EncryptedClient): |
| 55 | + return InternalLegacyOverride.CreateBuildFailure( |
| 56 | + InternalLegacyOverride.CreateError("Legacy encryptor is not supported") |
| 57 | + ) |
| 58 | + |
| 59 | + # Preconditions: MUST be able to create valid encryption context |
| 60 | + maybe_encryption_context = InternalLegacyOverride.legacyEncryptionContext(config) |
| 61 | + if maybe_encryption_context.is_Failure: |
| 62 | + return maybe_encryption_context |
| 63 | + |
| 64 | + # Precondition: All actions MUST be supported types |
| 65 | + maybe_actions = InternalLegacyOverride.legacyActions(legacy_override.attributeActionsOnEncrypt) |
| 66 | + if maybe_actions.is_Failure: |
| 67 | + return maybe_actions |
| 68 | + |
| 69 | + # Create and return the legacy override instance |
| 70 | + legacy_instance = InternalLegacyOverride() |
| 71 | + legacy_instance.encryptor = legacy_override.encryptor |
| 72 | + legacy_instance.policy = legacy_override.policy |
| 73 | + legacy_instance.crypto_config = CryptoConfig( |
| 74 | + materials_provider=legacy_override.encryptor._materials_provider, |
| 75 | + encryption_context=maybe_encryption_context.value, |
| 76 | + attribute_actions=maybe_actions.value, |
| 77 | + ) |
| 78 | + return InternalLegacyOverride.CreateBuildSuccess( |
| 79 | + InternalLegacyOverride.CreateInternalLegacyOverrideSome(legacy_instance) |
| 80 | + ) |
| 81 | + |
| 82 | + def __init__(self): |
| 83 | + super().__init__() |
| 84 | + self.encryptor = None |
| 85 | + self.crypto_config = None |
| 86 | + self.policy = None |
| 87 | + |
| 88 | + @staticmethod |
| 89 | + def legacyEncryptionContext(config: DynamoDbItemEncryptorConfig_DynamoDbItemEncryptorConfig): |
| 90 | + """Create the legacy encryption context from the config.""" |
| 91 | + try: |
| 92 | + # Convert Dafny types to Python strings for the encryption context |
| 93 | + table_name = _dafny.string_of(config.logicalTableName) |
| 94 | + partition_key_name = _dafny.string_of(config.partitionKeyName) |
| 95 | + sort_key_name = _dafny.string_of(config.sortKeyName.value) if config.sortKeyName.is_Some else None |
| 96 | + |
| 97 | + # Create the legacy encryption context with the extracted values |
| 98 | + encryption_context = EncryptionContext( |
| 99 | + table_name=table_name, |
| 100 | + partition_key_name=partition_key_name, |
| 101 | + sort_key_name=sort_key_name, |
| 102 | + ) |
| 103 | + |
| 104 | + return InternalLegacyOverride.CreateBuildSuccess(encryption_context) |
| 105 | + except Exception as e: |
| 106 | + # Return a failure with the error message if any exception occurs |
| 107 | + return InternalLegacyOverride.CreateBuildFailure(InternalLegacyOverride.CreateError(str(e))) |
| 108 | + |
| 109 | + @staticmethod |
| 110 | + def legacyActions(attribute_actions_on_encrypt): |
| 111 | + """Create the legacy attribute actions from the config.""" |
| 112 | + try: |
| 113 | + # Create a new AttributeActions with default ENCRYPT_AND_SIGN |
| 114 | + legacy_actions = AttributeActions(default_action=CryptoAction.ENCRYPT_AND_SIGN) |
| 115 | + |
| 116 | + # Map the action from the config to legacy actions |
| 117 | + attribute_actions = {} |
| 118 | + for key, action in attribute_actions_on_encrypt.items: |
| 119 | + # Convert the string key to Python string |
| 120 | + key_str = _dafny.string_of(key) |
| 121 | + |
| 122 | + # Map the action type to the appropriate CryptoAction |
| 123 | + if action == CryptoAction_ENCRYPT__AND__SIGN(): |
| 124 | + attribute_actions[key_str] = CryptoAction.ENCRYPT_AND_SIGN |
| 125 | + elif action == CryptoAction_SIGN__ONLY(): |
| 126 | + attribute_actions[key_str] = CryptoAction.SIGN_ONLY |
| 127 | + elif action == CryptoAction_DO__NOTHING(): |
| 128 | + attribute_actions[key_str] = CryptoAction.DO_NOTHING |
| 129 | + else: |
| 130 | + return InternalLegacyOverride.CreateBuildFailure( |
| 131 | + InternalLegacyOverride.CreateError(f"Unknown action type: {action}") |
| 132 | + ) |
| 133 | + |
| 134 | + # Update the attribute_actions dictionary |
| 135 | + legacy_actions.attribute_actions = attribute_actions |
| 136 | + return InternalLegacyOverride.CreateBuildSuccess(legacy_actions) |
| 137 | + except Exception as e: |
| 138 | + return InternalLegacyOverride.CreateBuildFailure(InternalLegacyOverride.CreateError(str(e))) |
| 139 | + |
| 140 | + def EncryptItem(self, input: EncryptItemInput_EncryptItemInput): |
| 141 | + """Encrypt an item using the legacy DynamoDB encryptor. |
| 142 | +
|
| 143 | + Args: |
| 144 | + input: EncryptItemInput containing the plaintext item to encrypt |
| 145 | +
|
| 146 | + Returns: |
| 147 | + Result containing the encrypted item or an error |
| 148 | + """ |
| 149 | + try: |
| 150 | + # Check policy |
| 151 | + if not self.policy.is_FORCE__LEGACY__ENCRYPT__ALLOW__LEGACY__DECRYPT: |
| 152 | + return Wrappers.Result_Failure( |
| 153 | + InternalLegacyOverride.CreateError("Legacy policy does not support encrypt") |
| 154 | + ) |
| 155 | + |
| 156 | + # Get the Native Plaintext Item |
| 157 | + native_input = aws_dbesdk_dynamodb.smithygenerated.aws_cryptography_dbencryptionsdk_dynamodb_itemencryptor.dafny_to_smithy.aws_cryptography_dbencryptionsdk_dynamodb_itemencryptor_EncryptItemInput( |
| 158 | + input |
| 159 | + ) |
| 160 | + |
| 161 | + # Use the encryptor to encrypt the item using the instance attributes |
| 162 | + encrypted_item = self.encryptor._encrypt_item( |
| 163 | + item=native_input.plaintext_item, |
| 164 | + crypto_config=self.crypto_config.with_item(native_input.plaintext_item), |
| 165 | + ) |
| 166 | + |
| 167 | + # Return the encrypted item |
| 168 | + # The legacy encryption client returns items in the format that Dafny expects, |
| 169 | + # so no additional conversion is needed here |
| 170 | + native_output = EncryptItemOutput(encrypted_item=encrypted_item, parsed_header=None) |
| 171 | + dafny_output = aws_dbesdk_dynamodb.smithygenerated.aws_cryptography_dbencryptionsdk_dynamodb_itemencryptor.smithy_to_dafny.aws_cryptography_dbencryptionsdk_dynamodb_itemencryptor_EncryptItemOutput( |
| 172 | + native_output |
| 173 | + ) |
| 174 | + return Wrappers.Result_Success(dafny_output) |
| 175 | + |
| 176 | + except Exception as e: |
| 177 | + # Return an appropriate error result with the exception details |
| 178 | + return Wrappers.Result_Failure(InternalLegacyOverride.CreateError(f"Error during encryption: {str(e)}")) |
| 179 | + |
| 180 | + def DecryptItem(self, input: DecryptItemInput_DecryptItemInput): |
| 181 | + """Decrypt an item using the legacy DynamoDB encryptor. |
| 182 | +
|
| 183 | + Args: |
| 184 | + input: DecryptItemInput containing the encrypted item to decrypt |
| 185 | +
|
| 186 | + Returns: |
| 187 | + Result containing the decrypted item or an error |
| 188 | + """ |
| 189 | + try: |
| 190 | + # Check policy |
| 191 | + if not ( |
| 192 | + self.policy.is_FORCE__LEGACY__ENCRYPT__ALLOW__LEGACY__DECRYPT |
| 193 | + or self.policy.is_FORBID__LEGACY__ENCRYPT__ALLOW__LEGACY__DECRYPT |
| 194 | + ): |
| 195 | + return Wrappers.Result_Failure( |
| 196 | + InternalLegacyOverride.CreateError("Legacy policy does not support decrypt") |
| 197 | + ) |
| 198 | + |
| 199 | + # Get the Native DecryptItemInput |
| 200 | + native_input: DecryptItemInput = ( |
| 201 | + aws_dbesdk_dynamodb.smithygenerated.aws_cryptography_dbencryptionsdk_dynamodb_itemencryptor.dafny_to_smithy.aws_cryptography_dbencryptionsdk_dynamodb_itemencryptor_DecryptItemInput( |
| 202 | + input |
| 203 | + ) |
| 204 | + ) |
| 205 | + # Use the encryptor to decrypt the item using the instance attributes |
| 206 | + decrypted_item = self.encryptor._decrypt_item( |
| 207 | + item=native_input.encrypted_item, |
| 208 | + crypto_config=self.crypto_config.with_item(native_input.encrypted_item), |
| 209 | + ) |
| 210 | + |
| 211 | + native_output = DecryptItemOutput(plaintext_item=decrypted_item, parsed_header=None) |
| 212 | + dafny_output = aws_dbesdk_dynamodb.smithygenerated.aws_cryptography_dbencryptionsdk_dynamodb_itemencryptor.smithy_to_dafny.aws_cryptography_dbencryptionsdk_dynamodb_itemencryptor_DecryptItemOutput( |
| 213 | + native_output |
| 214 | + ) |
| 215 | + return Wrappers.Result_Success(dafny_output) |
| 216 | + except Exception as e: |
| 217 | + # Return an appropriate error result with the exception details |
| 218 | + return Wrappers.Result_Failure(InternalLegacyOverride.CreateError(f"Error during decryption: {str(e)}")) |
| 219 | + |
| 220 | + def IsLegacyInput(self, input: DecryptItemInput_DecryptItemInput): |
| 221 | + """ |
| 222 | + Determine if the input is from a legacy client. |
| 223 | +
|
| 224 | + Args: |
| 225 | + input: The decrypt item input to check |
| 226 | +
|
| 227 | + Returns: |
| 228 | + Boolean indicating if the input is from a legacy client |
| 229 | + """ |
| 230 | + try: |
| 231 | + if not _HAS_LEGACY_DDBEC: |
| 232 | + return False |
| 233 | + |
| 234 | + if not input.is_DecryptItemInput: |
| 235 | + return False |
| 236 | + |
| 237 | + # Get the Native DecryptItemInput |
| 238 | + native_input: DecryptItemInput = ( |
| 239 | + aws_dbesdk_dynamodb.smithygenerated.aws_cryptography_dbencryptionsdk_dynamodb_itemencryptor.dafny_to_smithy.aws_cryptography_dbencryptionsdk_dynamodb_itemencryptor_DecryptItemInput( |
| 240 | + input |
| 241 | + ) |
| 242 | + ) |
| 243 | + # = specification/dynamodb-encryption-client/decrypt-item.md#determining-legacy-items |
| 244 | + ## An item MUST be determined to be encrypted under the legacy format if it contains |
| 245 | + ## attributes for the material description and the signature. |
| 246 | + return ( |
| 247 | + "*amzn-ddb-map-desc*" in native_input.encrypted_item |
| 248 | + and "*amzn-ddb-map-sig*" in native_input.encrypted_item |
| 249 | + ) |
| 250 | + |
| 251 | + except Exception as e: |
| 252 | + # If we encounter any error during detection, default to not using legacy |
| 253 | + return Wrappers.Result_Failure(InternalLegacyOverride.CreateError(f"Error in IsLegacyInput: {e}")) |
| 254 | + |
| 255 | + @staticmethod |
| 256 | + def CreateError(message): |
| 257 | + """Create an Error with the given message.""" |
| 258 | + return Error_DynamoDbItemEncryptorException(message) |
| 259 | + |
| 260 | + |
| 261 | +aws_dbesdk_dynamodb.internaldafny.generated.InternalLegacyOverride.InternalLegacyOverride = InternalLegacyOverride |
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