| layout | published | title | order |
|---|---|---|---|
default |
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Getting Started |
2 |
The installation is quick and straightforward - install, configure input & scan.
# install from pypi using pip
pip install checkov
# select an input folder that contains your terraform plan files
checkov -d /user/tf -h, --help show this help message and exit
-v, --version version
-d DIRECTORY, --directory DIRECTORY
IaC root directory (can not be used together with
--file).
-f FILE, --file FILE IaC file(can not be used together with --directory)
--external-checks-dir EXTERNAL_CHECKS_DIR
Directory for custom checks to be loaded. Can be
repeated
-l, --list List checks
-o [{cli,json,junitxml,github_failed_only}], --output [{cli,json,junitxml,github_failed_only}]
Report output format
--quiet in case of CLI output, display only failed checks
--framework {cloudformation,terraform,kubernetes,all}
filter scan to run only on a specific infrastructure
code frameworks
-c CHECK, --check CHECK
filter scan to run only on a specific check
identifier(allowlist), You can specify multiple checks
separated by comma delimiter
--skip-check SKIP_CHECK
filter scan to run on all check but a specific check
identifier(denylist), You can specify multiple checks
separated by comma delimiter
-s, --soft-fail Runs checks but suppresses error code
--bc-api-key BC_API_KEY
Bridgecrew API key
--repo-id REPO_ID Identity string of the repository, with form
<repo_owner>/<repo_name>
-b BRANCH, --branch BRANCH
Selected branch of the persisted repository. Only has
effect when using the --bc-api-key flag
Consider the following Terraform configuration of an S3 bucket:
resource "aws_s3_bucket" "foo-bucket" {
region = var.region
bucket = local.bucket_name
force_destroy = true
tags = {
Name = "foo-${data.aws_caller_identity.current.account_id}"
}
versioning {
enabled = true
}
logging {
target_bucket = "${aws_s3_bucket.log_bucket.id}"
target_prefix = "log/"
}
server_side_encryption_configuration {
rule {
apply_server_side_encryption_by_default {
kms_master_key_id = "${aws_kms_key.mykey.arn}"
sse_algorithm = "aws:kms"
}
}
}
acl = "private"
}
The appropriate output report is:
Passed checks: 4, Failed checks: 0, Skipped checks: 0
Check: "Ensure all data stored in the S3 bucket is securely encrypted at rest"
PASSED for resource: aws_s3_bucket.foo-bucket
File: /example.tf:1-25
Check: "Ensure the S3 bucket has access logging enabled"
PASSED for resource: aws_s3_bucket.foo-bucket
File: /example.tf:1-25
Check: "Ensure all data stored in the S3 bucket have versioning enabled"
PASSED for resource: aws_s3_bucket.foo-bucket
File: /example.tf:1-25
Check: "S3 Bucket has an ACL defined which allows public access."
PASSED for resource: aws_s3_bucket.foo-bucket
File: /example.tf:1-25The scanned bucket's configuration seems to comply with the available aws_s3_bucket resource type checks.
Suppose that now the bucket is used for static content hosting, and thus requires to configured with allowed public access:
resource "aws_s3_bucket" "foo-bucket" {
region = var.region
bucket = local.bucket_name
force_destroy = true
tags = {
Name = "foo-${data.aws_caller_identity.current.account_id}"
}
versioning {
enabled = true
}
logging {
target_bucket = "${aws_s3_bucket.log_bucket.id}"
target_prefix = "log/"
}
server_side_encryption_configuration {
rule {
apply_server_side_encryption_by_default {
kms_master_key_id = "${aws_kms_key.mykey.arn}"
sse_algorithm = "aws:kms"
}
}
}
acl = "public-read"
}
data "aws_caller_identity" "current" {}
The output report would then contain the failed check:
Passed checks: 3, Failed checks: 1, Skipped checks: 0
Check: "Ensure all data stored in the S3 bucket is securely encrypted at rest"
PASSED for resource: aws_s3_bucket.foo-bucket
File: /example.tf:1-25
Check: "Ensure the S3 bucket has access logging enabled"
PASSED for resource: aws_s3_bucket.foo-bucket
File: /example.tf:1-25
Check: "Ensure all data stored in the S3 bucket have versioning enabled"
PASSED for resource: aws_s3_bucket.foo-bucket
File: /example.tf:1-25
Check: "S3 Bucket has an ACL defined which allows public access."
FAILED for resource: aws_s3_bucket.foo-bucket
File: /example.tf:1-25
1 | resource "aws_s3_bucket" "foo-bucket" {
2 | region = var.region
3 | bucket = local.bucket_name
4 | force_destroy = true
5 |
6 | tags = {
7 | Name = "foo-${data.aws_caller_identity.current.account_id}"
8 | }
9 | versioning {
10 | enabled = true
11 | }
12 | logging {
13 | target_bucket = "${aws_s3_bucket.log_bucket.id}"
14 | target_prefix = "log/"
15 | }
16 | server_side_encryption_configuration {
17 | rule {
18 | apply_server_side_encryption_by_default {
19 | kms_master_key_id = "${aws_kms_key.mykey.arn}"
20 | sse_algorithm = "aws:kms"
21 | }
22 | }
23 | }
24 | acl = "public-read"
25 | }
The corresponding check would now fail, and the report will include the appropriate failing configuration source code.
In order to skip the failed check, we annotate the bucket with a suppression comment (which needs to appear inside the resource scope):
resource "aws_s3_bucket" "foo-bucket" {
# checkov:skip=CKV_AWS_20:The bucket is a public static content host
region = var.region
bucket = local.bucket_name
force_destroy = true
tags = {
Name = "foo-${data.aws_caller_identity.current.account_id}"
}
versioning {
enabled = true
}
logging {
target_bucket = "${aws_s3_bucket.log_bucket.id}"
target_prefix = "log/"
}
server_side_encryption_configuration {
rule {
apply_server_side_encryption_by_default {
kms_master_key_id = "${aws_kms_key.mykey.arn}"
sse_algorithm = "aws:kms"
}
}
}
acl = "public-read"
}
Checkov would then skip check CKV_AWS_20, and the output report would be:
Passed checks: 3, Failed checks: 0, Skipped checks: 1
Check: "Ensure all data stored in the S3 bucket is securely encrypted at rest"
PASSED for resource: aws_s3_bucket.foo-bucket
File: /example.tf:1-25
Check: "Ensure the S3 bucket has access logging enabled"
PASSED for resource: aws_s3_bucket.foo-bucket
File: /example.tf:1-25
Check: "Ensure all data stored in the S3 bucket have versioning enabled"
PASSED for resource: aws_s3_bucket.foo-bucket
File: /example.tf:1-25
Check: "S3 Bucket has an ACL defined which allows public access."
SKIPPED for resource: aws_s3_bucket.foo-bucket
Suppress comment: The bucket is a public static content host
File: /example.tf:1-25To scan you directory with only a specific check use the -c\ --check flag. You can use multiple checks with comma , delimiter.
This is another way to skip execution of specific checks on a allowlist fashion
The following example will show results only for 2 scans (CKV_AWS_1 and CKV_AWS_2) :
checkov -d /user/tf --check CKV_AWS_1,CKV_AWS_2For the sake of the example, we use the previous bucket configuration and disable it;s versioning is disabled for a check to fail.
checkov -d /user/tf -o jsonSample output
{
"results": {
"passed_checks": [
{
"check_id": "CKV_AWS_19",
"check_name": "Ensure all data stored in the S3 bucket is securely encrypted at rest",
"check_result": {
"result": "PASSED"
},
"code_block": [
[
1,
"resource \"aws_s3_bucket\" \"foo-bucket\" {\n"
],
[
2,
" region = var.region\n"
],
[
3,
" bucket = local.bucket_name\n"
],
[
4,
" force_destroy = true\n"
],
[
5,
" #checkov:skip=CKV_AWS_20:The bucket is a public static content host\n"
],
[
6,
" tags = {\n"
],
[
7,
" Name = \"foo-${data.aws_caller_identity.current.account_id}\"\n"
],
[
8,
" }\n"
],
[
9,
" versioning {\n"
],
[
10,
" enabled = false\n"
],
[
11,
" }\n"
],
[
12,
" logging {\n"
],
[
13,
" target_bucket = \"${aws_s3_bucket.log_bucket.id}\"\n"
],
[
14,
" target_prefix = \"log/\"\n"
],
[
15,
" }\n"
],
[
16,
" server_side_encryption_configuration {\n"
],
[
17,
" rule {\n"
],
[
18,
" apply_server_side_encryption_by_default {\n"
],
[
19,
" kms_master_key_id = \"${aws_kms_key.mykey.arn}\"\n"
],
[
20,
" sse_algorithm = \"aws:kms\"\n"
],
[
21,
" }\n"
],
[
22,
" }\n"
],
[
23,
" }\n"
],
[
24,
" acl = \"public-read\"\n"
],
[
25,
"}\n"
]
],
"file_path": "/example.tf",
"file_line_range": [
1,
25
],
"resource": "aws_s3_bucket.foo-bucket",
"check_class": "checkov.terraform.checks.resource.aws.S3Encryption"
},
{
"check_id": "CKV_AWS_18",
"check_name": "Ensure the S3 bucket has access logging enabled",
"check_result": {
"result": "PASSED"
},
"code_block": [
[
1,
"resource \"aws_s3_bucket\" \"foo-bucket\" {\n"
],
[
2,
" region = var.region\n"
],
[
3,
" bucket = local.bucket_name\n"
],
[
4,
" force_destroy = true\n"
],
[
5,
" #checkov:skip=CKV_AWS_20:The bucket is a public static content host\n"
],
[
6,
" tags = {\n"
],
[
7,
" Name = \"foo-${data.aws_caller_identity.current.account_id}\"\n"
],
[
8,
" }\n"
],
[
9,
" versioning {\n"
],
[
10,
" enabled = false\n"
],
[
11,
" }\n"
],
[
12,
" logging {\n"
],
[
13,
" target_bucket = \"${aws_s3_bucket.log_bucket.id}\"\n"
],
[
14,
" target_prefix = \"log/\"\n"
],
[
15,
" }\n"
],
[
16,
" server_side_encryption_configuration {\n"
],
[
17,
" rule {\n"
],
[
18,
" apply_server_side_encryption_by_default {\n"
],
[
19,
" kms_master_key_id = \"${aws_kms_key.mykey.arn}\"\n"
],
[
20,
" sse_algorithm = \"aws:kms\"\n"
],
[
21,
" }\n"
],
[
22,
" }\n"
],
[
23,
" }\n"
],
[
24,
" acl = \"public-read\"\n"
],
[
25,
"}\n"
]
],
"file_path": "/example.tf",
"file_line_range": [
1,
25
],
"resource": "aws_s3_bucket.foo-bucket",
"check_class": "checkov.terraform.checks.resource.aws.S3AccessLogs"
}
],
"failed_checks": [
{
"check_id": "CKV_AWS_21",
"check_name": "Ensure all data stored in the S3 bucket have versioning enabled",
"check_result": {
"result": "FAILED"
},
"code_block": [
[
1,
"resource \"aws_s3_bucket\" \"foo-bucket\" {\n"
],
[
2,
" region = var.region\n"
],
[
3,
" bucket = local.bucket_name\n"
],
[
4,
" force_destroy = true\n"
],
[
5,
" #checkov:skip=CKV_AWS_20:The bucket is a public static content host\n"
],
[
6,
" tags = {\n"
],
[
7,
" Name = \"foo-${data.aws_caller_identity.current.account_id}\"\n"
],
[
8,
" }\n"
],
[
9,
" versioning {\n"
],
[
10,
" enabled = false\n"
],
[
11,
" }\n"
],
[
12,
" logging {\n"
],
[
13,
" target_bucket = \"${aws_s3_bucket.log_bucket.id}\"\n"
],
[
14,
" target_prefix = \"log/\"\n"
],
[
15,
" }\n"
],
[
16,
" server_side_encryption_configuration {\n"
],
[
17,
" rule {\n"
],
[
18,
" apply_server_side_encryption_by_default {\n"
],
[
19,
" kms_master_key_id = \"${aws_kms_key.mykey.arn}\"\n"
],
[
20,
" sse_algorithm = \"aws:kms\"\n"
],
[
21,
" }\n"
],
[
22,
" }\n"
],
[
23,
" }\n"
],
[
24,
" acl = \"public-read\"\n"
],
[
25,
"}\n"
]
],
"file_path": "/example.tf",
"file_line_range": [
1,
25
],
"resource": "aws_s3_bucket.foo-bucket",
"check_class": "checkov.terraform.checks.resource.aws.S3Versioning"
}
],
"skipped_checks": [
{
"check_id": "CKV_AWS_20",
"check_name": "S3 Bucket has an ACL defined which allows public access.",
"check_result": {
"result": "SKIPPED",
"suppress_comment": "The bucket is a public static content host"
},
"code_block": [
[
1,
"resource \"aws_s3_bucket\" \"foo-bucket\" {\n"
],
[
2,
" region = var.region\n"
],
[
3,
" bucket = local.bucket_name\n"
],
[
4,
" force_destroy = true\n"
],
[
5,
" #checkov:skip=CKV_AWS_20:The bucket is a public static content host\n"
],
[
6,
" tags = {\n"
],
[
7,
" Name = \"foo-${data.aws_caller_identity.current.account_id}\"\n"
],
[
8,
" }\n"
],
[
9,
" versioning {\n"
],
[
10,
" enabled = false\n"
],
[
11,
" }\n"
],
[
12,
" logging {\n"
],
[
13,
" target_bucket = \"${aws_s3_bucket.log_bucket.id}\"\n"
],
[
14,
" target_prefix = \"log/\"\n"
],
[
15,
" }\n"
],
[
16,
" server_side_encryption_configuration {\n"
],
[
17,
" rule {\n"
],
[
18,
" apply_server_side_encryption_by_default {\n"
],
[
19,
" kms_master_key_id = \"${aws_kms_key.mykey.arn}\"\n"
],
[
20,
" sse_algorithm = \"aws:kms\"\n"
],
[
21,
" }\n"
],
[
22,
" }\n"
],
[
23,
" }\n"
],
[
24,
" acl = \"public-read\"\n"
],
[
25,
"}\n"
]
],
"file_path": "/example.tf",
"file_line_range": [
1,
25
],
"resource": "aws_s3_bucket.foo-bucket",
"check_class": "checkov.terraform.checks.resource.aws.S3PublicACL"
}
],
"parsing_errors": []
},
"summary": {
"passed": 2,
"failed": 1,
"skipped": 1,
"parsing_errors": 0,
"checkov_version": "1.0.63"
}
}Each Checkov policy is defined by resources it scans and expected values for related resource blocks.
For example, a policy that ensures all data is stored in S3 is versioned, scans the versioning configuration for all aws_s3_bucket supported resources. The scan_resource_conf is a method that defines the scan's expected behavior, i.e. versioning_block['enabled']
from checkov.common.models.enums import CheckResult, CheckCategories
from checkov.terraform.checks.resource.base_resource_check import BaseResourceCheck
class S3Versioning(BaseResourceCheck):
def __init__(self):
name = "Ensure all data stored in the S3 bucket is versioned"
id = "CKV_AWS_21"
supported_resources = ['aws_s3_bucket']
categories = [CheckCategories.BACKUP_AND_RECOVERY]
super().__init__(name=name, id=id, categories=categories, supported_resources=supported_resources)
def scan_resource_conf(self, conf):
if 'versioning' in conf.keys():
versioning_block = conf['versioning'][0]
if versioning_block['enabled'][0]:
return CheckResult.SUCCESS
return CheckResult.FAILURE
scanner = S3Versioning()Consider the following Terraform AWS S3 bucket configuration:
# example_versioning_pass.tf
resource "aws_s3_bucket" "foo-bucket" {
region = var.region
bucket = local.bucket_name
force_destroy = true
tags = {
Name = "foo-${data.aws_caller_identity.current.account_id}"
}
versioning {
enabled = true
}
Running checkov -d ./example_versioning_pass.tf -o cli would yield a PASSED check result for the S3Versioning scanner:
...
Check: "Ensure all data stored in the S3 bucket have versioning enabled"
PASSED for resource: aws_s3_bucket.foo-bucket
File: /example.tf:1-24
...If the scanned configuration would have been without bucket versioning enabled, the corresponding check would fail:
Configuration:
example_acl_fail.tf
resource "aws_s3_bucket" "foo-bucket" {
region = var.region
bucket = local.bucket_name
force_destroy = true
tags = {
Name = "foo-${data.aws_caller_identity.current.account_id}"
}
versioning {
enabled = false
}
}
Run result:
> checkov -d ./example_versioning_fail.tf -o cli
Check: "Ensure all data stored in the S3 bucket have versioning enabled"
FAILED for resource: aws_s3_bucket.foo-bucket
File: /example_versioning_fail.tf:1-12
1 | resource "aws_s3_bucket" "foo-bucket" {
2 | region = var.region
3 | bucket = local.bucket_name
4 | force_destroy = true
5 |
6 | tags = {
7 | Name = "foo-${data.aws_caller_identity.current.account_id}"
8 | }
9 | versioning {
10 | enabled = false
11 | }
12 | }From this point, you can head to the Policies for further examples or the How-to Guides section if you’re ready to get your hands dirty.