├── .github
└── PULL_REQUEST_TEMPLATE.md
├── LICENSE
├── NOTICE
├── README.md
├── images
└── secure-ingress-architecture.png
├── lambda
├── fle_decrypt_data.py
├── fle_decrypt_data.zip
├── fle_decrypt_data.zip.sha1.txt
└── package_notes.md
└── templates
└── fle-sample.yaml
/.github/PULL_REQUEST_TEMPLATE.md:
--------------------------------------------------------------------------------
1 | *Issue #, if available:*
2 |
3 | *Description of changes:*
4 |
5 |
6 | By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
7 |
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/LICENSE:
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/NOTICE:
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1 | Field Level Encryption Sample
2 | Copyright 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
3 |
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/README.md:
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1 | # Enhance the Security of Sensitive Customer Data by Using Amazon CloudFront Field-Level Encryption
2 |
3 | ***The complete post for this solution is [available on the AWS Security Blog](https://aws.amazon.com/blogs/security/how-to-enhance-the-security-of-sensitive-customer-data-by-using-amazon-cloudfront-field-level-encryption/).***
4 |
5 | ### How CloudFront field-level encryption works
6 |
7 | Many web applications collect and store data from users as those users interact with the applications. For example, a travel booking website may ask for your passport number and less sensitive data such as your food preferences. This data is transmitted to web servers and also might travel among a number of services to perform tasks. However, this also means that your sensitive information may need to be accessed by only a small subset of these services (most other services do not need to access your data).
8 | User data is often stored in a database for retrieval at a later time. One approach to protecting stored sensitive data is to cautiously configure and code each service to ensure that sensitive data is protected. For example, you can develop safeguards in logging functionality to ensure sensitive data is masked or removed. This can add complexity to your code base and limit performance.
9 |
10 | Field-level encryption addresses this problem by ensuring sensitive data is encrypted at CloudFront edge locations. Sensitive data fields in HTTPS form POSTs are automatically encrypted with a user-provided public RSA key. After the data is encrypted, other systems in your architecture see only ciphertext. Even if this ciphertext unintentionally becomes externally available, the data is cryptographically protected and only designated systems with access to the private RSA key can decrypt the sensitive data.
11 | It is critical to secure private RSA key material to prevent unauthorized access to the protected data. Management of cryptographic key material is a larger topic that is out of scope for this blog post, but should be carefully considered when implementing encryption in your applications. For example, in this blog post we store private key material as a secure string in the Amazon EC2 Systems Manager Parameter Store. The Parameter Store provides a centralized location for managing your configuration data such as plaintext data (such as database strings) or secrets (such as passwords) that are encrypted using AWS Key Management Service (AWS KMS). You may have an existing key management system in place that you can use, or you can use AWS CloudHSM. CloudHSM is a cloud-based hardware security module (HSM) that enables you to easily generate and use your own encryption keys in the AWS Cloud.
12 |
13 | To illustrate field-level encryption, let's look at a simple form submission where Name and Phone values are sent to a web server using an HTTP POST. A typical form POST would contain data such as the following.
14 |
15 | ~~~
16 | POST / HTTP/1.1
17 | Host: example.com
18 | Content-Type: application/x-www-form-urlencoded
19 | Content-Length:60
20 |
21 | Name=Jane+Doe&Phone=404-555-0150
22 |
23 |
24 | Instead of taking this typical approach, field-level encryption converts this data similar to the following.
25 | POST / HTTP/1.1
26 | Host: example.com
27 | Content-Type: application/x-www-form-urlencoded
28 | Content-Length: 1713
29 |
30 | Name=Jane+Doe&Phone=AYABeHxZ0ZqWyysqxrB5pEBSYw4AAA...
31 | ~~~
32 |
33 | To further demonstrate field-level encryption in action, this blog post includes a sample serverless application that you can deploy by using a CloudFormation template, which creates an application environment using CloudFront, Amazon API Gateway and Lambda. The sample application is only intended to demonstrate field-level encryption functionality and is not intended for production use. The following diagram depicts the architecture and data flow of this sample application.
34 |
35 | ### Architecture Overview
36 |
37 | 
38 |
39 | Here is how the sample solution works:
40 |
41 | 1. An application user submits an HTML form page with sensitive data, generating an HTTPS POST to CloudFront.
42 | 2. Field-level encryption intercepts the form POST and encrypts sensitive data with the public RSA key and replaces fields in the form post with encrypted ciphertext. The form POST ciphertext is then sent to origin servers.
43 | 3. The serverless application accepts the form post data containing cipher text where sensitive data would normally reside. If a malicious user were able to compromise your application and gain access to your data, such as the contents of a form, this data is encrypted.
44 | 4. AWS Lambda stores data in a DynamoDB table, leaving sensitive data to remain safely encrypted at rest.
45 | 5. An administrator the AWS Console and a Lambda function to view the sensitive data.
46 | 6. During the session, the administrator retrieves cipher text from the DynamoDB table.
47 | 7. An administrator decrypts sensitive data using private key material stored in EC2 Systems Manager Parameter Store.
48 | 8. Finally, decrypted sensitive data is transmitted over SSL/TLS via the AWS console to the administrator for review.
49 |
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/images/secure-ingress-architecture.png:
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https://raw.githubusercontent.com/aws-samples/field-level-encryption-sample/2cd906fe9ba040cc2fe5b1b7aaf5e7a9b5a20964/images/secure-ingress-architecture.png
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/lambda/fle_decrypt_data.py:
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1 | # Copyright 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
2 | #
3 | # Licensed under the Apache License, Version 2.0 (the "License"). You
4 | # may not use this file except in compliance with the License. A copy of
5 | # the License is located at
6 | #
7 | # http://aws.amazon.com/apache2.0/
8 | #
9 | # or in the "license" file accompanying this file. This file is
10 | # distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
11 | # ANY KIND, either express or implied. See the License for the specific
12 | # language governing permissions and limitations under the License.
13 |
14 | import os
15 | import json
16 | import boto3
17 |
18 | import aws_encryption_sdk
19 | from aws_encryption_sdk.internal.crypto import WrappingKey
20 | from aws_encryption_sdk.key_providers.raw import RawMasterKeyProvider
21 | from aws_encryption_sdk.identifiers import WrappingAlgorithm, EncryptionKeyType
22 |
23 | from Crypto.PublicKey import RSA
24 | import base64
25 |
26 | PrivateKeyPath = os.environ['PRIVATEKEYSSMPATH']
27 | DBTableName = os.environ['TABLENAME']
28 | provider_id = os.environ['PROVIDERID']
29 | PublicKeyName = os.environ['PUBLICKEYNAME']
30 |
31 | def decrypt_data(event, context):
32 | class SIFPrivateMasterKeyProvider(RawMasterKeyProvider):
33 | provider_id = provider_id
34 |
35 | def __new__(cls, *args, **kwargs):
36 | obj = super(SIFPrivateMasterKeyProvider, cls).__new__(cls)
37 | return obj
38 |
39 | def __init__(self, private_key_id, private_key_text):
40 | RawMasterKeyProvider.__init__(self)
41 |
42 | private_key = RSA.importKey(private_key_text)
43 | self._key = private_key.exportKey()
44 |
45 | RawMasterKeyProvider.add_master_key(self, private_key_id)
46 |
47 | def _get_raw_key(self, key_id):
48 | return WrappingKey(
49 | wrapping_algorithm=WrappingAlgorithm.RSA_OAEP_SHA256_MGF1,
50 | wrapping_key=self._key,
51 | wrapping_key_type=EncryptionKeyType.PRIVATE
52 | )
53 |
54 | def DecryptField(private_key, field_data):
55 | # add padding if needed base64 decoding
56 | field_data = field_data + '=' * (-len(field_data) % 4)
57 | # base64-decode to get binary ciphertext
58 | ciphertext = base64.b64decode(field_data)
59 | # decrypt ciphertext into plaintext
60 | plaintext, header = aws_encryption_sdk.decrypt(
61 | source=ciphertext,
62 | key_provider=sif_private_master_key_provider
63 | )
64 | return plaintext
65 |
66 | # retrieve private key from Parameter Store into local memory
67 | ssmclient = boto3.client('ssm')
68 | ssmresponse = ssmclient.get_parameter(
69 | Name=PrivateKeyPath,
70 | WithDecryption=True
71 | )
72 | private_key_text = ssmresponse['Parameter']['Value']
73 | sif_private_master_key_provider = SIFPrivateMasterKeyProvider(PublicKeyName, private_key_text)
74 |
75 | # connect to DynamoDB table
76 | ddbclient = boto3.client('dynamodb')
77 | DBResponse = ddbclient.scan(TableName = DBTableName)
78 |
79 | d = []
80 | for i in DBResponse['Items']:
81 | # Phone fields are encrypted, each field will require decryption
82 | PhoneDecrypted = DecryptField( private_key_text, i['Phone']['S'] )
83 | d.append( ['Name: ' + i['Name']['S'], 'Email: ' + i['Email']['S'],
84 | 'Phone Encrypted: ' + i['Phone']['S'][:30] + '...', 'Phone Decrypted: ' + PhoneDecrypted ] )
85 |
86 | # remove private key from local memory
87 | private_key_text = None
88 |
89 | # return result
90 | return d
91 |
92 | def main():
93 | decrypt_data ("test", "test")
94 |
95 | if __name__ == "__main__":
96 | main()
97 |
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/lambda/fle_decrypt_data.zip:
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https://raw.githubusercontent.com/aws-samples/field-level-encryption-sample/2cd906fe9ba040cc2fe5b1b7aaf5e7a9b5a20964/lambda/fle_decrypt_data.zip
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/lambda/fle_decrypt_data.zip.sha1.txt:
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1 | 000497a7c5cb1a96fd96e2b476b206868ee95311 fle_decrypt_data.zip
2 |
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/lambda/package_notes.md:
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1 |
2 | ### Building Lambda Decrypt Package
3 |
4 | ***Use these steps as a general guideline if you need to build your own Python decryption function package for Lambda.***
5 |
6 | #### Launch documented Amazon Linux AMI:
7 | http://docs.aws.amazon.com/lambda/latest/dg/current-supported-versions.html
8 |
9 | #### ssh and install environment:
10 |
11 | ~~~~
12 | mkdir fle
13 | sudo yum -y install gcc
14 | virtualenv fle
15 | source fle/bin/activate
16 | pip install --upgrade pip
17 | pip install cryptography aws_encryption_sdk pycrypto
18 |
19 | cd fle/lib/python2.7/site-packages/; zip -r ~/fle_decrypt_data.zip * .*
20 |
21 | cd fle/lib64/python2.7/site-packages/; zip -r ~/fle_decrypt_data.zip * .*
22 | ~~~~
23 |
24 | #### Lastly add the function code to the zip from here:
25 |
26 | https://github.com/aws-samples/field-level-encryption-sample/blob/master/lambda/fle_decrypt_data.py
27 |
28 | #### More info:
29 | http://docs.aws.amazon.com/lambda/latest/dg/lambda-python-how-to-create-deployment-package.html
30 |
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/templates/fle-sample.yaml:
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1 | Description: >
2 | Field-level encryption sample
3 | You will be billed for the AWS resources used if you create a stack from this template.
4 | **NOTICE** Copyright 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
5 | Licensed under the Apache License, Version 2.0 (the "License").
6 | You may not use this file except in compliance with the License.
7 | A copy of the License is located at http://www.apache.org/licenses/LICENSE-2.0 or in the "license" file accompanying this file.
8 | This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
9 | either express or implied. See the License for the specific language governing permissions and limitations under the License.
10 |
11 | Parameters:
12 |
13 | ProviderID:
14 | Description: Provider ID used in Field-level encryption configuration in CloudFront (letters and numbers only, no special characters)
15 | Type: String
16 | Default: FLEDemo
17 | AllowedPattern: ^[0-9a-zA-Z]*$
18 | ConstraintDescription: Letters and numbers only, no special characters
19 | PublicKeyName:
20 | Description: Name assigned to public key in Field-level encryption configuration in CloudFront (letters and numbers only, no special characters)
21 | Type: String
22 | Default: DemoPublicKey
23 | AllowedPattern: ^[0-9a-zA-Z]*$
24 | ConstraintDescription: Letters and numbers only, no special characters
25 | PrivateKeySSMPath:
26 | Description: Parameter Store path where encrypted private key is stored
27 | Type: String
28 | Default: /cloudfront/field-encryption-sample/private-key
29 | AllowedPattern: ^/[0-9a-zA-Z]+([0-9a-zA-Z/-]*[0-9a-zA-Z])*$
30 | ConstraintDescription: Must start with / and contain only letters, numbers, hyphens (-) and slashes (/)
31 | ArtifactsBucket:
32 | Description: S3 bucket with artifact files (Lambda functions, templates, html files, etc.)
33 | Type: String
34 | Default: awsiammedia
35 | AllowedPattern: ^[0-9a-zA-Z]+([0-9a-zA-Z-]*[0-9a-zA-Z])*$
36 | ConstraintDescription: ArtifactsBucket S3 bucket name can include numbers, lowercase letters, uppercase letters, and hyphens (-). It cannot start or end with a hyphen (-).
37 | ArtifactsPrefix:
38 | Description: Path in the S3 bucket containing artifact files
39 | Type: String
40 | Default: public/sample/CloudFrontFieldLevelEncryption/
41 | AllowedPattern: ^[0-9a-zA-Z-/]*$
42 | ConstraintDescription: ArtifactsPrefix key prefix can include numbers, lowercase letters, uppercase letters, hyphens (-), and forward slash (/).
43 |
44 | Metadata:
45 | AWS::CloudFormation::Interface:
46 | ParameterGroups:
47 | - Label:
48 | default: Field-level encryption (FLE) configuration
49 | Parameters:
50 | - ProviderID
51 | - PublicKeyName
52 | - PrivateKeySSMPath
53 | - Label:
54 | default: Artifacts configuration
55 | Parameters:
56 | - ArtifactsBucket
57 | - ArtifactsPrefix
58 | Resources:
59 | FieldEncryptionKey:
60 | Type: "AWS::KMS::Key"
61 | Properties:
62 | Description: "field-encryption-sample"
63 | KeyPolicy:
64 | Version: "2012-10-17"
65 | Id: "field-encryption-sample"
66 | Statement:
67 | -
68 | Sid: 'Enable IAM User Permissions'
69 | Effect: Allow
70 | Principal:
71 | AWS: !Sub 'arn:aws:iam::${AWS::AccountId}:root'
72 | Action:
73 | - kms:*
74 | Resource: '*'
75 |
76 | FLEApi:
77 | Type: AWS::ApiGateway::RestApi
78 | Properties:
79 | Name: FLEApi
80 | Body:
81 | swagger: 2.0
82 | info:
83 | version: "2017-11-23T15:06:37Z"
84 | title: "forms"
85 | securityDefinitions:
86 | api_key:
87 | type: apiKey
88 | name: x-api-key
89 | in: header
90 | paths:
91 | /:
92 | get:
93 | produces:
94 | - "application/json"
95 | security:
96 | - api_key: []
97 | responses:
98 | "200":
99 | description: "200 response"
100 | schema:
101 | $ref: "#/definitions/Empty"
102 | x-amazon-apigateway-integration:
103 | responses:
104 | default:
105 | statusCode: "200"
106 | uri: !Sub "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${GETFunction.Arn}/invocations"
107 | passthroughBehavior: "when_no_match"
108 | httpMethod: "POST"
109 | contentHandling: "CONVERT_TO_TEXT"
110 | type: "aws_proxy"
111 | post:
112 | produces:
113 | - "application/json"
114 | security:
115 | - api_key: []
116 | responses:
117 | "200":
118 | description: "200 response"
119 | schema:
120 | $ref: "#/definitions/Empty"
121 | headers:
122 | Access-Control-Allow-Origin:
123 | type: "string"
124 | x-amazon-apigateway-integration:
125 | responses:
126 | default:
127 | statusCode: "200"
128 | responseParameters:
129 | method.response.header.Access-Control-Allow-Origin: "'*'"
130 | uri: !Sub "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${POSTFunction.Arn}/invocations"
131 | passthroughBehavior: "when_no_match"
132 | httpMethod: "POST"
133 | contentHandling: "CONVERT_TO_TEXT"
134 | type: "aws_proxy"
135 | options:
136 | consumes:
137 | - "application/json"
138 | produces:
139 | - "application/json"
140 | responses:
141 | "200":
142 | description: "200 response"
143 | schema:
144 | $ref: "#/definitions/Empty"
145 | headers:
146 | Access-Control-Allow-Origin:
147 | type: "string"
148 | Access-Control-Allow-Methods:
149 | type: "string"
150 | Access-Control-Allow-Headers:
151 | type: "string"
152 | x-amazon-apigateway-integration:
153 | responses:
154 | default:
155 | statusCode: "200"
156 | responseParameters:
157 | method.response.header.Access-Control-Allow-Methods: "'POST,OPTIONS'"
158 | method.response.header.Access-Control-Allow-Headers: "'Content-Type,X-Amz-Date,Authorization,X-Api-Key,X-Amz-Security-Token'"
159 | method.response.header.Access-Control-Allow-Origin: "'*'"
160 | passthroughBehavior: "when_no_match"
161 | requestTemplates:
162 | application/json: "{\"statusCode\": 200}"
163 | type: "mock"
164 | definitions:
165 | Empty:
166 | type: "object"
167 | title: "Empty Schema"
168 |
169 | FLEApiKey:
170 | Type: "AWS::ApiGateway::ApiKey"
171 | DependsOn:
172 | - "FLEApiDeployment"
173 | - "FLEApi"
174 | Properties:
175 | Name: "FLEApiKey"
176 | Description: "FLE CloudFormation API Key V1"
177 | Enabled: "true"
178 | StageKeys:
179 | - RestApiId: !Ref "FLEApi"
180 | StageName: "prod"
181 | FLEusagePlan:
182 | Type: AWS::ApiGateway::UsagePlan
183 | DependsOn:
184 | - "FLEApiDeployment"
185 | - "FLEApi"
186 | Properties:
187 | ApiStages:
188 | - ApiId: !Ref 'FLEApi'
189 | Stage: "prod"
190 | Description: FLE Demo Usage Plan
191 | FLEusagePlanKey:
192 | Type: "AWS::ApiGateway::UsagePlanKey"
193 | Properties :
194 | KeyId: !Ref 'FLEApiKey'
195 | KeyType: API_KEY
196 | UsagePlanId: !Ref 'FLEusagePlan'
197 |
198 | GetAPIKey:
199 | Type: "Custom::GetApiKey"
200 | Version: "1.0"
201 | Properties:
202 | ServiceToken: !GetAtt GetAPIKeyFunction.Arn
203 | Region: !Ref "AWS::Region"
204 | GetAPIKeyFunction:
205 | Type: AWS::Lambda::Function
206 | DependsOn:
207 | - "FLEApiKey"
208 | Properties:
209 | Description: Return API Gateway Key
210 | Handler: index.handler
211 | Runtime: python3.6
212 | Environment:
213 | Variables:
214 | FLEAPIKEY: !Ref FLEApiKey
215 | Role: !GetAtt GetAPIKeyExecutionRole.Arn
216 | Timeout: 60
217 | Code:
218 | ZipFile: |
219 | import cfnresponse
220 | import os
221 | import boto3
222 | from botocore.exceptions import ClientError
223 | import json
224 | import logging
225 | logger = logging.getLogger()
226 | logger.setLevel(logging.INFO)
227 | client = boto3.client('apigateway')
228 | FLEApiKey = os.environ['FLEAPIKEY']
229 | def handler(event, context):
230 | responseData = {}
231 | try:
232 | logger.info('Received event: {}'.format(json.dumps(event)))
233 | # Assume failure unless we obtain an api key
234 | responseStatus = cfnresponse.FAILED
235 | if event['RequestType'] == 'Delete':
236 | responseStatus = cfnresponse.SUCCESS
237 | elif event['RequestType'] == 'Create' or event['RequestType'] == 'Update':
238 | # Try to obtain FLE api key
239 | response = client.get_api_key(apiKey=FLEApiKey, includeValue=True)
240 | responseData = {'APIKeyValue': response['value']}
241 | responseStatus = cfnresponse.SUCCESS
242 | except ClientError as e:
243 | logger.error('Error: {}'.format(e))
244 | responseStatus = cfnresponse.FAILED
245 | # Log the response status
246 | logger.info('Returning response status of: {}'.format(responseStatus))
247 | # Send result to stack
248 | cfnresponse.send(event, context, responseStatus, responseData)
249 | GetAPIKeyExecutionRole:
250 | Type: AWS::IAM::Role
251 | Properties:
252 | AssumeRolePolicyDocument:
253 | Version: 2012-10-17
254 | Statement:
255 | - Effect: Allow
256 | Principal:
257 | Service: lambda.amazonaws.com
258 | Action: sts:AssumeRole
259 | Policies:
260 | - PolicyName: AllowGetFLEApiKey
261 | PolicyDocument:
262 | Version: '2012-10-17'
263 | Statement:
264 | - Effect: Allow
265 | Action:
266 | - logs:CreateLogGroup
267 | - logs:CreateLogStream
268 | - logs:PutLogEvents
269 | - logs:DescribeLogStreams
270 | Resource: arn:aws:logs:*:*:*
271 | - Effect: Allow
272 | Action:
273 | - apigateway:GET
274 | Resource: !Sub 'arn:aws:apigateway:${AWS::Region}::/apikeys/${FLEApiKey}'
275 |
276 | FLEApiDeployment:
277 | Type: AWS::ApiGateway::Deployment
278 | Properties:
279 | Description: Prod deployment for FLE API
280 | RestApiId: !Ref FLEApi
281 | StageName: "prod"
282 |
283 | FLEApiPOSTFunctionPermissions:
284 | Type: AWS::Lambda::Permission
285 | Properties:
286 | Action: lambda:InvokeFunction
287 | FunctionName: !Ref POSTFunction
288 | Principal: apigateway.amazonaws.com
289 | SourceArn: !Sub 'arn:aws:execute-api:${AWS::Region}:${AWS::AccountId}:${FLEApi}/*/POST/'
290 |
291 | FLEApiGETFunctionPermissions:
292 | Type: AWS::Lambda::Permission
293 | Properties:
294 | Action: lambda:InvokeFunction
295 | FunctionName: !Ref GETFunction
296 | Principal: apigateway.amazonaws.com
297 | SourceArn: !Sub 'arn:aws:execute-api:${AWS::Region}:${AWS::AccountId}:${FLEApi}/*/GET/'
298 |
299 | ContactsDynamoDBTable:
300 | Type: AWS::DynamoDB::Table
301 | Properties:
302 | AttributeDefinitions:
303 | -
304 | AttributeName: "Email"
305 | AttributeType: "S"
306 | KeySchema:
307 | -
308 | AttributeName: "Email"
309 | KeyType: "HASH"
310 | ProvisionedThroughput:
311 | ReadCapacityUnits: "5"
312 | WriteCapacityUnits: "5"
313 |
314 | GETFunctionExecutionRole:
315 | Type: AWS::IAM::Role
316 | Properties:
317 | AssumeRolePolicyDocument:
318 | Version: '2012-10-17'
319 | Statement:
320 | - Effect: Allow
321 | Principal:
322 | Service:
323 | - lambda.amazonaws.com
324 | Action:
325 | - sts:AssumeRole
326 | Path: "/"
327 | Policies:
328 | - PolicyName: Allow-Logging-Into-CWL
329 | PolicyDocument:
330 | Version: '2012-10-17'
331 | Statement:
332 | - Effect: Allow
333 | Action:
334 | - logs:CreateLogGroup
335 | - logs:CreateLogStream
336 | - logs:PutLogEvents
337 | - logs:DescribeLogStreams
338 | Resource: arn:aws:logs:*:*:*
339 | GETFunction:
340 | Type: AWS::Lambda::Function
341 | Properties:
342 | Handler: index.lambda_handler
343 | Role: !GetAtt GETFunctionExecutionRole.Arn
344 | Runtime: python3.6
345 | Timeout: 10
346 | MemorySize: 128
347 | Code:
348 | ZipFile: |
349 | import json
350 | def html_template():
351 | template="""
352 |
353 |
354 | Amazon CloudFront Field-Level Encryption - Demo
368 |
369 |
Field-Level Encryption Demo
370 |
This application demonstrates Amazon CloudFront Field-Level Encryption feature