├── .gitignore
├── .github
└── FUNDING.yml
├── Makefile
├── lambda
├── authorizer.js
└── api.js
├── api.openapi.yml
├── docs
├── launch-stack.svg
└── aws-ecr-public.svg
├── README.md
├── serverless.template.yml
└── LICENSE
/.gitignore:
--------------------------------------------------------------------------------
1 | .build
2 | dist
3 |
--------------------------------------------------------------------------------
/.github/FUNDING.yml:
--------------------------------------------------------------------------------
1 | github: monken
2 |
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/Makefile:
--------------------------------------------------------------------------------
1 | TEMPLATE ?= dist/aws-ecr-public.template.json
2 | STACK_NAME ?= aws-ecr-public
3 | VALIDATION_DOMAIN ?= ""
4 | DOMAIN_NAME ?= ""
5 | VALIDATION_METHOD ?= "EMAIL"
6 |
7 | VERSION = 1.2.0
8 |
9 | build: serverless.template.yml api.openapi.yml lambda/*
10 | mkdir -p dist
11 | cfn-include -t -m serverless.template.yml > $(TEMPLATE)
12 |
13 | test: build
14 | aws cloudformation deploy \
15 | --template-file $(TEMPLATE) \
16 | --stack-name $(STACK_NAME) \
17 | --capabilities CAPABILITY_IAM \
18 | --parameter-overrides \
19 | ValidationDomain=$(VALIDATION_DOMAIN) \
20 | DomainName=$(DOMAIN_NAME) \
21 | ValidationMethod=$(VALIDATION_METHOD) \
22 | AuthBasicUsername=foo \
23 | AuthBasicPassword=bar \
24 | Authorizer=BASIC
25 |
26 | publish: build
27 | aws s3 cp --acl public-read dist/aws-ecr-public.template.json s3://monken/aws-ecr-public/v$(VERSION)/template.json
28 |
29 | clean:
30 | rm -rf dist
31 | aws cloudformation delete-stack --stack-name $(STACK_NAME)
32 |
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/lambda/authorizer.js:
--------------------------------------------------------------------------------
1 | const https = require('https');
2 | const assert = require('assert').strict;
3 |
4 | const { ADO_ORG, METHOD, BASIC_USER, BASIC_PASSWORD } = process.env;
5 |
6 | const UNAUTHORIZED = new Error('Unauthorized');
7 |
8 | function basicAuth(user, password) {
9 | assert(user === BASIC_USER && password === BASIC_PASSWORD, UNAUTHORIZED);
10 | }
11 |
12 | function azureDevOps(user, password) {
13 | if (user !== 'ADO' || !ADO_ORG) throw UNAUTHORIZED;
14 |
15 | return new Promise((resolve, reject) => https.get(`https://dev.azure.com/${ADO_ORG}/_apis/projects`, {
16 | headers: {
17 | Authorization: `Bearer ${password}`,
18 | },
19 | }, async (res) => {
20 | // empty buffer
21 | for await (const chunk of res) {}
22 | if (res.statusCode === 200) resolve();
23 | else reject(UNAUTHORIZED);
24 | }));
25 | }
26 |
27 | exports.handler = async ({ authorizationToken }) => {
28 | const [type, encoded] = authorizationToken.split(/\s+/, 2);
29 | const [user, password] = Buffer.from(encoded, 'base64').toString().split(':', 2);
30 |
31 | if (METHOD === 'AZURE_DEVOPS') {
32 | await azureDevOps(user, password);
33 | } else if (METHOD === 'BASIC') {
34 | await basicAuth(user, password);
35 | } else throw UNAUTHORIZED;
36 |
37 | return {
38 | policyDocument: {
39 | Version: '2012-10-17',
40 | Statement: [{
41 | Effect: 'Allow',
42 | Resource: '*',
43 | Action: 'execute-api:Invoke',
44 | }]
45 | },
46 | };
47 | };
48 |
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/api.openapi.yml:
--------------------------------------------------------------------------------
1 | openapi: '3.0.1'
2 | info:
3 | version: '1'
4 | title: !Ref AWS::StackName
5 |
6 | x-default-request: &request
7 | security:
8 | Fn::If:
9 | - HasAuthorizer
10 | - [basic: []]
11 | - []
12 | responses:
13 | 200:
14 | description: "200 response"
15 | content: {}
16 | x-amazon-apigateway-integration:
17 | responses:
18 | default:
19 | statusCode: 200
20 | uri: !Sub arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${ApiFunction.Arn}/invocations
21 | passthroughBehavior: when_no_match
22 | httpMethod: POST
23 | type: aws_proxy
24 |
25 | x-amazon-apigateway-gateway-responses:
26 | UNAUTHORIZED:
27 | statusCode: 401
28 | responseParameters:
29 | gatewayresponse.header.WWW-Authenticate: "'Basic'"
30 | responseTemplates:
31 | application/json:
32 | Fn::Stringify:
33 | errors:
34 | - code: UNAUTHORIZED
35 |
36 | paths:
37 | /:
38 | get:
39 | <<: *request
40 | x-amazon-apigateway-integration:
41 | responses:
42 | default:
43 | statusCode: 200
44 | passthroughBehavior: when_no_match
45 | requestTemplates:
46 | application/json: "{\"statusCode\": 200}"
47 | type: mock
48 |
49 | /{proxy+}:
50 | get:
51 | <<: *request
52 | head:
53 | <<: *request
54 |
55 | components:
56 | securitySchemes:
57 | Fn::If:
58 | - HasAuthorizer
59 | - basic:
60 | type: apiKey
61 | name: Authorization
62 | in: header
63 | x-amazon-apigateway-authtype: custom
64 | x-amazon-apigateway-authorizer:
65 | authorizerUri:
66 | Fn::Sub:
67 | - arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${AuthorizerLambdaArn}/invocations
68 | - AuthorizerLambdaArn: !If [ HasCustomAuthorizer, !Ref AuthCustomLambdaArn, !GetAtt AuthorizerFunction.Arn ]
69 | authorizerResultTtlInSeconds: 300
70 | type: token
71 | - !Ref AWS::NoValue
72 |
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/lambda/api.js:
--------------------------------------------------------------------------------
1 | const AWS = require("aws-sdk");
2 | const ecr = new AWS.ECR();
3 |
4 | const handledErrors = {
5 | AccessDeniedException: {
6 | statusCode: 403,
7 | error: {
8 | code: "DENIED",
9 | message: "requested access to the resource is denied"
10 | }
11 | },
12 | RepositoryNotFoundException: {
13 | statusCode: 404,
14 | error: {
15 | code: "NAME_UNKNOWN",
16 | message: "repository name not known to registry"
17 | }
18 | }
19 | };
20 |
21 | const actions = {
22 | manifests: {
23 | head: async (name, ref) => {
24 | const res = await actions.manifests.get(name, ref);
25 | return {
26 | ...res,
27 | body: ""
28 | };
29 | },
30 | get: async (name, ref) => {
31 | // matching is done according to https://docs.docker.com/registry/spec/api/#content-digests
32 | // however the algorithm regex seems broken in their docs
33 | // matching to a word should be enough to catch it
34 | if (ref.match(/^\w+:[A-Fa-f0-9]+$/)) {
35 | selectorObj = { imageDigest: ref };
36 | } else {
37 | selectorObj = { imageTag: ref };
38 | }
39 |
40 | const { images } = await ecr
41 | .batchGetImage({
42 | imageIds: [selectorObj],
43 | repositoryName: name
44 | })
45 | .promise();
46 |
47 | const image = images[0];
48 | if (!image) return { statusCode: 404, body: "{}" };
49 | const manifest = JSON.parse(image.imageManifest);
50 |
51 | return {
52 | statusCode: 200,
53 | body: image.imageManifest,
54 | multiValueHeaders: {
55 | "Content-Type": [manifest.mediaType]
56 | }
57 | };
58 | }
59 | },
60 | blobs: {
61 | get: async (name, digest) => {
62 | const url = await ecr
63 | .getDownloadUrlForLayer({
64 | repositoryName: name,
65 | layerDigest: digest
66 | })
67 | .promise();
68 |
69 | return {
70 | statusCode: 307,
71 | headers: {
72 | Location: url.downloadUrl,
73 | "Docker-Content-Digest": url.layerDigest
74 | }
75 | };
76 | }
77 | }
78 | };
79 |
80 | exports.handler = async event => {
81 | console.log(JSON.stringify(event));
82 | const context = event.requestContext;
83 | const segments = context.path.split(/\//);
84 | const [action, reference] = segments.slice(segments.length - 2);
85 | const name = segments.slice(2, segments.length - 2).join("/");
86 |
87 | let fn;
88 |
89 | try {
90 | fn = actions[action][context.httpMethod.toLowerCase()];
91 | } catch (e) {
92 | return { statusCode: 404 };
93 | }
94 |
95 | return fn(name, reference).catch(e => {
96 | if (Object.keys(handledErrors).includes(e.name)) {
97 | const errResponse = handledErrors[e.name];
98 | return {
99 | statusCode: errResponse.statusCode,
100 | body: JSON.stringify({
101 | errors: [errResponse.error]
102 | })
103 | };
104 | } else {
105 | console.log(e.toString ? e.toString() : e);
106 | throw e;
107 | }
108 | });
109 | };
110 |
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/docs/launch-stack.svg:
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1 |
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/README.md:
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1 | # Public AWS Elastic Container Registry
2 |
3 | Host any Elastic Container Registry (ECR) publicly on a custom domain using this serverless proxy.
4 |
5 | Give it a spin:
6 |
7 | ```bash
8 | # pull a container from a registry named nginx with no authentication
9 | docker pull v3iomfy255.execute-api.us-east-2.amazonaws.com/nginx:alpine
10 | ```
11 |
12 | ## Solution Overview
13 |
14 | ECR doesn't support [public registries](https://aws.amazon.com/ecr/faqs/). Instead, the docker client needs to authenticate with ECR using AWS IAM credentials which requires the AWS CLI or an SDK that can generate those credentials.
15 |
16 | If you would like to make your registries publicly available then this solution can help. It deploys an API Gateway and a Lambda function that act as a proxy for AWS ECR. [Custom authentication](https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-use-lambda-authorizer.html) can easily be added in the API Gateway. Roll your own JWT-based authentication or whatever you desire. Additionally, you can configure the [API Gateway to be private](https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-private-apis.html) and thus limit access to docker clients within your VPC.
17 |
18 | 
19 |
20 | ## Deploy
21 |
22 | [](https://console.aws.amazon.com/cloudformation/home?#/stacks/create/review?filter=active&templateURL=https%3A%2F%2Fs3.us-east-2.amazonaws.com%2Fmonken%2Faws-ecr-public%2Fv1.2.0%2Ftemplate.json&stackName=ecr-public)
23 |
24 | [Download Template](https://s3.us-east-2.amazonaws.com/monken/aws-ecr-public/v1.2.0/template.json)
25 |
26 |
27 | ### Template Parameters
28 |
29 | | Parameter | Required | Description |
30 | | -- | -- | -- |
31 | | DomainName | No | If provided an ACM Certificate and API Domain Name will be created
32 | | ValidationDomain | No | Overwrite default Validation Domain for ACM Certificate
33 | | ValidationMethod | Yes, default to `EMAIL` | Allow you to use `DNS` instead of `EMAIL` for Certificate validation
34 | | Authorizer | No, defaults to `NONE` | Valid values are `NONE`, `BASIC`, `AZURE_DEVOPS` or `CUSTOM`
35 | | AuthBasicUsername | If Authorizer is `BASIC` | Username for Basic authentication
36 | | AuthBasicPassword | If Authorizer is `BASIC` | Password for Basic authentication
37 | | AuthAzureDevOpsOrg | If Authorizer is `AZURE_DEVOPS` | Organization name in Azure Devops
38 | | AuthCustomLambdaArn | If Authorizer is `CUSTOM` | ARN of your custom Lambda authorizer
39 |
40 | ## Authorizers
41 |
42 | This template ships with support for Basic authentication, Azure Devops (using system or access token) and custom Lambda.
43 |
44 | Azure DevOps Pipeline example:
45 |
46 | ```yaml
47 | # username must be ADO
48 | steps:
49 | - script: |
50 | echo $TOKEN | docker login --username ADO --password-stdin example.execute-api.us-east-2.amazonaws.com
51 | docker pull example.execute-api.us-east-2.amazonaws.com/nginx:latest
52 | env:
53 | TOKEN: $(System.AccessToken)
54 | ```
55 |
56 | ## FAQ
57 |
58 | ### How can I host this proxy on a custom domain?
59 |
60 | Simply provide the `DomainName` parameter when you create the stack. This will create an ACM certificate and API Domain Name resource. The Regional Domain Name and Hosted Zone ID can be found in the outputs tab of the stack. You will need those to create the DNS record in Route 53 (or similar DNS service).
61 |
62 | For Route 53, open your hosted zone, create a **New Record Set**, enter the domain name, set **Alias** to **Yes** and paste the `RegionalDomainName` in the **Alias Target** field.
63 |
64 | ### How can I restrict access to certain registries?
65 |
66 | By default all registries in the account and region will be made publicly available. To limit the number of publicly available repositores, attach a custom policy to the Lambda execution role (look for `${AWS::StackName}-LambdaRole-*`). The following policy will restrict public access to the `myapp` repository (make sure you replace the variables with your region and account id).
67 |
68 | ```json
69 | {
70 | "Version": "2012-10-17",
71 | "Statement": [
72 | {
73 | "Action": [
74 | "ecr:GetDownloadUrlForLayer",
75 | "ecr:BatchGetImage"
76 | ],
77 | "NotResource": [
78 | "arn:aws:ecr:${AWS::Region}:${AWS::AccountId}:repository/myapp"
79 | ],
80 | "Effect": "Deny"
81 | }
82 | ]
83 | }
84 | ```
85 |
86 | ## Develop
87 |
88 | ```
89 | npm install --global cfn-include
90 | make build
91 | make test # create/update CloudFormation stack
92 | make clean # delete CloudFormation stack
93 | ```
94 |
95 | ## In the works
96 |
97 | * Cross-account and cross-region access to registries
98 | * Tag-based permissions
99 | * Implement additional endpoints for listing images and tags
100 |
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/serverless.template.yml:
--------------------------------------------------------------------------------
1 | AWSTemplateFormatVersion: '2010-09-09'
2 | Transform: AWS::Serverless-2016-10-31
3 |
4 | Description: https://github.com/monken/aws-ecr-public
5 |
6 | Metadata:
7 | AWS::CloudFormation::Interface:
8 | ParameterGroups:
9 | - Label: { default: Configuration }
10 | Parameters:
11 | - ValidationDomain
12 | - DomainName
13 | - ValidationMethod
14 | - Authorizer
15 | - Label: { default: Basic Authentication }
16 | Parameters:
17 | - AuthBasicUsername
18 | - AuthBasicPassword
19 | - Label: { default: Azure DevOps Authentication }
20 | Parameters:
21 | - AuthAzureDevOpsOrg
22 | - Label: { default: Custom Lambda Authentication }
23 | Parameters:
24 | - AuthCustomLambdaArn
25 | ParameterLabels:
26 | ValidationDomain: { default: Validation Domain }
27 | DomainName: { default: Domain Name }
28 | ValidationMethod: { default: Validation Method }
29 | AuthBasicUsername: { default: Username }
30 | AuthBasicPassword: { default: Password }
31 | AuthAzureDevOpsOrg: { default: DevOps Organization Name }
32 | AuthCustomLambdaArn: { default: Lambda ARN }
33 |
34 |
35 | Parameters:
36 | ValidationDomain:
37 | Type: String
38 | Default: ''
39 | Description: Overwrite default validation domain for ACM certificate.
40 | DomainName:
41 | Type: String
42 | Default: ''
43 | Description: If provided, an ACM Certificate and API Domain Name will be created.
44 | ValidationMethod:
45 | Type: String
46 | Default: EMAIL
47 | AllowedValues: [EMAIL, DNS]
48 | Description: Choose a validation method for the ACM certificate, only relevant if a Domain Name was provided.
49 |
50 | Authorizer:
51 | Type: String
52 | Default: NONE
53 | AllowedValues: [NONE, BASIC, AZURE_DEVOPS, CUSTOM]
54 | Description: Add an authorizer to your registry. Make sure to provide details below.
55 |
56 | AuthBasicUsername:
57 | Type: String
58 | Default: ''
59 |
60 | AuthBasicPassword:
61 | Type: String
62 | Default: ''
63 | NoEcho: true
64 |
65 | AuthAzureDevOpsOrg:
66 | Type: String
67 | Default: ''
68 | Description: Provide the name of the Azure DevOps organization that is allowed to authenticate. The username is ADO, the password is the System.AccessToken or user token.
69 |
70 | AuthCustomLambdaArn:
71 | Type: String
72 | Default: ''
73 | Description: Provide the full ARN to a custom authorizer function. Permissions will be added automatically.
74 |
75 | Conditions:
76 | HasValidationDomain: !Not [ !Equals [ !Ref ValidationDomain, '' ] ]
77 | HasDomainName: !Not [ !Equals [ !Ref DomainName, '' ] ]
78 | HasAuthorizer: !Not [ !Equals [ !Ref Authorizer, NONE ] ]
79 | HasCustomAuthorizer: !Equals [ !Ref Authorizer, CUSTOM ]
80 |
81 | Resources:
82 | CloudWatchRole:
83 | Type: AWS::IAM::Role
84 | Properties:
85 | AssumeRolePolicyDocument:
86 | Version: '2012-10-17'
87 | Statement:
88 | - Effect: Allow
89 | Principal:
90 | Service: apigateway.amazonaws.com
91 | Action: sts:AssumeRole
92 | ManagedPolicyArns:
93 | - arn:aws:iam::aws:policy/service-role/AmazonAPIGatewayPushToCloudWatchLogs
94 |
95 | ApiGatewayRole:
96 | Type: AWS::ApiGateway::Account
97 | DependsOn: Api
98 | Properties:
99 | CloudWatchRoleArn: !GetAtt CloudWatchRole.Arn
100 |
101 | ApiAccessLogGroup:
102 | Type: AWS::Logs::LogGroup
103 | Properties:
104 | LogGroupName: !Sub /${AWS::StackName}/accesslog
105 | RetentionInDays: 7
106 |
107 | Api:
108 | Type: AWS::Serverless::Api
109 | Properties:
110 | StageName: v2
111 | DefinitionBody: !Include api.openapi.yml
112 | EndpointConfiguration: REGIONAL
113 | MinimumCompressionSize: 0
114 | TracingEnabled: true
115 | OpenApiVersion: '3.0.1'
116 | # trigger a redeployment of the Authorizer changes
117 | BinaryMediaTypes: [!Ref Authorizer]
118 | AccessLogSetting:
119 | DestinationArn: !GetAtt ApiAccessLogGroup.Arn
120 | Format:
121 | # https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-mapping-template-reference.html#context-variable-reference
122 | Fn::Stringify:
123 | requestId: $context.requestId
124 | ip: $context.identity.sourceIp
125 | caller: $context.identity.caller
126 | userArn: $context.identity.userArn
127 | requestTimeEpoch: $context.requestTimeEpoch
128 | httpMethod: $context.httpMethod
129 | resourcePath: $context.resourcePath
130 | path: $context.path
131 | status: $context.status
132 | protocol: $context.protocol
133 | responseLength: $context.responseLength
134 | responseLatency: $context.responseLatency
135 | integrationLatency: $context.integrationLatency
136 | error: $context.error
137 |
138 | Certificate:
139 | Type: AWS::CertificateManager::Certificate
140 | Condition: HasDomainName
141 | Properties:
142 | DomainName: !Ref DomainName
143 | ValidationMethod: !Ref ValidationMethod
144 | DomainValidationOptions:
145 | Fn::If:
146 | - HasValidationDomain
147 | - - DomainName: !Ref DomainName
148 | ValidationDomain: !Ref ValidationDomain
149 | - !Ref AWS::NoValue
150 |
151 | ApiDomainName:
152 | Type: AWS::ApiGateway::DomainName
153 | Condition: HasDomainName
154 | Properties:
155 | RegionalCertificateArn: !Ref Certificate
156 | DomainName: !Ref DomainName
157 | EndpointConfiguration:
158 | Types: [REGIONAL]
159 |
160 | BasePathMapping:
161 | Type: AWS::ApiGateway::BasePathMapping
162 | Condition: HasDomainName
163 | DependsOn: Apiv2Stage
164 | Properties:
165 | BasePath: v2
166 | DomainName: !Ref ApiDomainName
167 | RestApiId: !Ref Api
168 | Stage: v2
169 |
170 | ApiFunction:
171 | Type: AWS::Serverless::Function
172 | Properties:
173 | Handler: index.handler
174 | Runtime: nodejs12.x
175 | InlineCode: !Include { type: string, location: lambda/api.js }
176 | Timeout: 30
177 | Events:
178 | Api:
179 | Type: Api
180 | Properties:
181 | Path: /{proxy+}
182 | Method: ANY
183 | RestApiId: !Ref Api
184 | Policies:
185 | - Version: '2012-10-17'
186 | Statement:
187 | - Effect: Allow
188 | Action:
189 | - ecr:GetDownloadUrlForLayer
190 | - ecr:BatchGetImage
191 | Resource: '*'
192 |
193 | AuthorizerFunction:
194 | Type: AWS::Serverless::Function
195 | Condition: HasAuthorizer
196 | Properties:
197 | Handler: index.handler
198 | Runtime: nodejs12.x
199 | InlineCode: !Include { type: string, location: lambda/authorizer.js }
200 | Timeout: 30
201 | Environment:
202 | Variables:
203 | ADO_ORG: !Ref AuthAzureDevOpsOrg
204 | BASIC_USER: !Ref AuthBasicUsername
205 | BASIC_PASSWORD: !Ref AuthBasicPassword
206 | METHOD: !Ref Authorizer
207 |
208 | AuthorizerPermission:
209 | Type: AWS::Lambda::Permission
210 | Condition: HasAuthorizer
211 | Properties:
212 | Action: lambda:InvokeFunction
213 | FunctionName: !If [ HasCustomAuthorizer, !Ref AuthCustomLambdaArn, !GetAtt AuthorizerFunction.Arn ]
214 | Principal: apigateway.amazonaws.com
215 | SourceArn: !Sub arn:aws:execute-api:${AWS::Region}:${AWS::AccountId}:${Api}/authorizers/*
216 |
217 |
218 | Outputs:
219 | ApiDomainName:
220 | Value: !Sub ${Api}.execute-api.${AWS::Region}.amazonaws.com
221 | Export:
222 | Name: !Sub ${AWS::StackName}:ApiDomainName
223 | RegionalDomainName:
224 | Value: !If [ HasDomainName, !GetAtt ApiDomainName.RegionalDomainName, 'null']
225 | Export:
226 | Name: !Sub ${AWS::StackName}:RegionalDomainName
227 | RegionalHostedZoneId:
228 | Value: !If [ HasDomainName, !GetAtt ApiDomainName.RegionalHostedZoneId, 'null']
229 | Export:
230 | Name: !Sub ${AWS::StackName}:RegionalHostedZoneId
231 | LambdaExecutionRoleName:
232 | Value: !Ref ApiFunctionRole
233 | Export:
234 | Name: !Sub ${AWS::StackName}:LambdaExecutionRoleName
235 |
--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
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