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fix(dynamodb): addtoresourcepolicy fix for table (v1) construct #31516

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fix(dynamodb): addtoresourcepolicy fix for table (v1) construct #31516

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49bfdb1
fix(dynamodb): addtoresourcepolicy fix for table (v1)
Sep 21, 2024
57dab53
Merge branch 'main' into addtorbp-fix-v1
LeeroyHannigan Sep 21, 2024
057ab1e
Fixed addToResourcePolicy, grants need work
Sep 24, 2024
4668ce7
Merge branch 'main' into addtorbp-fix-v1
LeeroyHannigan Oct 12, 2024
3fb88ac
Fix failing unit tests with statement length check
Oct 12, 2024
99284b8
Fixing addToResourcePolicy
Oct 12, 2024
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2 changes: 1 addition & 1 deletion ...-testing/framework-integ/test/aws-dynamodb/test/integ.dynamodb.policy.js.snapshot/cdk.out
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12 changes: 1 addition & 11 deletions ...sting/framework-integ/test/aws-dynamodb/test/integ.dynamodb.policy.js.snapshot/integ.json
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9 changes: 3 additions & 6 deletions ...ng/framework-integ/test/aws-dynamodb/test/integ.dynamodb.policy.js.snapshot/manifest.json
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6 changes: 3 additions & 3 deletions ...est/aws-dynamodb/test/integ.dynamodb.policy.js.snapshot/resource-policy-stack.assets.json
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30 changes: 30 additions & 0 deletions ...t/aws-dynamodb/test/integ.dynamodb.policy.js.snapshot/resource-policy-stack.template.json
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Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,36 @@
"ProvisionedThroughput": {
"ReadCapacityUnits": 5,
"WriteCapacityUnits": 5
},
"ResourcePolicy": {
"PolicyDocument": {
"Statement": [
{
"Action": "dynamodb:*",
"Effect": "Allow",
"Principal": {
"AWS": {
"Fn::Join": [
"",
[
"arn:",
{
"Ref": "AWS::Partition"
},
":iam::",
{
"Ref": "AWS::AccountId"
},
":root"
]
]
}
},
"Resource": "*"
}
],
"Version": "2012-10-17"
}
}
},
"UpdateReplacePolicy": "Delete",
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2 changes: 1 addition & 1 deletion ...odb.policy.js.snapshot/resourcepolicyintegtestDefaultTestDeployAssert9778837B.assets.json
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30 changes: 30 additions & 0 deletions ...esting/framework-integ/test/aws-dynamodb/test/integ.dynamodb.policy.js.snapshot/tree.json
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7 changes: 6 additions & 1 deletion packages/@aws-cdk-testing/framework-integ/test/aws-dynamodb/test/integ.dynamodb.policy.ts
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Expand Up @@ -39,7 +39,12 @@ export class TestStack extends Stack {
removalPolicy: RemovalPolicy.DESTROY,
});

this.tableTwo.grantReadData(new iam.AccountPrincipal('123456789012'));
this.tableTwo.addToResourcePolicy( new iam.PolicyStatement({
actions: ['dynamodb:*'],
principals: [new iam.AccountRootPrincipal()],
resources: ['*'],
}));

}
}

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54 changes: 30 additions & 24 deletions packages/aws-cdk-lib/aws-dynamodb/lib/table.ts
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Expand Up @@ -524,7 +524,7 @@ export interface TableAttributes {
readonly grantIndexPermissions?: boolean;
}

export abstract class TableBase extends Resource implements ITable, iam.IResourceWithPolicy {
export abstract class TableBase extends Resource implements ITable {
/**
* @attribute
*/
Expand Down Expand Up @@ -564,7 +564,7 @@ export abstract class TableBase extends Resource implements ITable, iam.IResourc
* @param actions The set of actions to allow (i.e. "dynamodb:PutItem", "dynamodb:GetItem", ...)
*/
public grant(grantee: iam.IGrantable, ...actions: string[]): iam.Grant {
return iam.Grant.addToPrincipalOrResource({
return iam.Grant.addToPrincipal({
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Why does this need to become addToPrincipal? We are for example already using the resource policy to grant cross-account access to a table directly. We build the policy in CDK from external account ArnPrincipals.

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Because addToPrincipalOrResource never adds to the resource, as IAM is missing methods. So I'm putting it back to how it was before I changed it until I have time to implement the missing methods in IAM

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I don't fully understand what methods are missing. Looking at Grant, it seems to be handling this already, if given the resource in the call: https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-iam/lib/grant.ts#L145-L157. It's just that Table.addToResourcePolicy is not functional, but instead adds statements to a policy instance not bound with the internal CfnTable.

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@LeeroyHannigan I want to check if I follow your line of thoughts here.

I see the iam.Grant.addToPrincipalOrResource is implemented here. It basically does 2 things, call addToPrincipal and a bit further down on line 151, it calls options.resource.addToResourcePolicy, which means the Table.addToResourcePolicy. Since the method is reportedly a no-op (from #30793), you are saying your change here from addToPrincipalOrResource to addToPrincipal will not change any actual behaviour.

I agree with that. But if I understand @everilae correctly, even though Table.addToResourcePolicy was a no-op, there may be CDK users who are currently relying on what iam.Grant.addToPrincipalOrResource returns (it returns the resource policy statement whereas iam.Grant.addToPrincipal returns principal policy statement.). This allows CDK users to use this method to build the resource policy instead of creating their own.

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Hi,

We rely on the "...OrResource" part, or would like to, once all this is fixed. If the call is replaced with just "addToPrincipal", then attempts at granting to external accounts would not work.

grantee,
actions,
resourceArns: [
Expand All @@ -575,7 +575,7 @@ export abstract class TableBase extends Resource implements ITable, iam.IResourc
produce: () => this.hasIndex ? `${arn}/index/*` : Aws.NO_VALUE,
})),
],
resource: this,
scope: this,
});
}
/**
Expand Down Expand Up @@ -691,23 +691,6 @@ export abstract class TableBase extends Resource implements ITable, iam.IResourc
return this.combinedGrant(grantee, { keyActions, tableActions: ['dynamodb:*'] });
}

/**
* Adds a statement to the resource policy associated with this file system.
* A resource policy will be automatically created upon the first call to `addToResourcePolicy`.
*
* Note that this does not work with imported file systems.
*
* @param statement The policy statement to add
*/
public addToResourcePolicy(statement: iam.PolicyStatement): iam.AddToResourcePolicyResult {
this.resourcePolicy = this.resourcePolicy ?? new iam.PolicyDocument({ statements: [] });
this.resourcePolicy.addStatements(statement);
return {
statementAdded: true,
policyDependable: this,
};
}

/**
* Return the given named metric for this Table
*
Expand Down Expand Up @@ -958,11 +941,11 @@ export abstract class TableBase extends Resource implements ITable, iam.IResourc
produce: () => this.hasIndex ? `${arn}/index/*` : Aws.NO_VALUE,
})),
];
const ret = iam.Grant.addToPrincipalOrResource({
const ret = iam.Grant.addToPrincipal({
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Same as above, this would break Table v1 for us.

grantee,
actions: opts.tableActions,
resourceArns: resources,
resource: this,
scope: this,
});
return ret;
}
Expand All @@ -971,11 +954,11 @@ export abstract class TableBase extends Resource implements ITable, iam.IResourc
throw new Error(`DynamoDB Streams must be enabled on the table ${this.node.path}`);
}
const resources = [this.tableStreamArn];
const ret = iam.Grant.addToPrincipalOrResource({
const ret = iam.Grant.addToPrincipal({
grantee,
actions: opts.streamActions,
resourceArns: resources,
resource: this,
scope: this,
});
return ret;
}
Expand Down Expand Up @@ -1732,6 +1715,29 @@ export class Table extends TableBase {
},
};
}

/**
* Adds a statement to the resource policy associated with this file system.
* A resource policy will be automatically created upon the first call to `addToResourcePolicy`.
*
* Note that this does not work with imported file systems.
*
* @param statement The policy statement to add
*/
public addToResourcePolicy(statement: iam.PolicyStatement): iam.AddToResourcePolicyResult {

this.resourcePolicy = this.resourcePolicy ?? new iam.PolicyDocument({ statements: [] });
this.resourcePolicy.addStatements(statement);

this.table.resourcePolicy = {
policyDocument: this.resourcePolicy,
};

return {
statementAdded: true,
policyDependable: this,
};
}
}

/**
Expand Down
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