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Merged
bmonkman merged 2 commits into from
Sep 29, 2020
Merged

Require MFA to be enabled for user accounts #116

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c094b46
Require MFA to be enabled for user accounts
bmonkman Sep 29, 2020
9fdd0a3
Use json of policy doc
bmonkman Sep 29, 2020
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13 changes: 13 additions & 0 deletions templates/terraform/environments/shared/main.tf
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Original file line number Diff line number Diff line change
Expand Up @@ -54,6 +54,19 @@ resource "aws_iam_user" "access_user" {
}
}


# This is recommended to be enabled, ensuring that all users must use MFA
# https://docs.aws.amazon.com/securityhub/latest/userguide/securityhub-cis-controls.html#securityhub-cis-controls-1.2
resource "aws_iam_group_membership" "mfa_required_group" {
name = "mfa-required"

users = [
for user in local.users : user.name
]

group = aws_iam_group.mfa_required.name
}

output "iam_users" {
value = aws_iam_user.access_user
}
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87 changes: 87 additions & 0 deletions templates/terraform/environments/shared/mfa_required.tf
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Original file line number Diff line number Diff line change
@@ -0,0 +1,87 @@
# AWS policy documents for requiring MFA
data "aws_iam_policy_document" "mfa_required_policy" {
statement {
sid = "AllowViewAccountInfo"
effect = "Allow"
actions = [
"iam:GetAccountPasswordPolicy",
"iam:GetAccountSummary",
"iam:ListVirtualMFADevices",
]
resources = ["*"]
}

statement {
sid = "AllowManageOwnVirtualMFADevice"
effect = "Allow"
actions = [
"iam:CreateVirtualMFADevice",
"iam:DeleteVirtualMFADevice"
]
resources = [ "arn:aws:iam::${local.account_id}:mfa/$${aws:username}" ]
}

statement {
sid = "AllowManageOwnUserMFA"
effect = "Allow"
actions = [
"iam:DeactivateMFADevice",
"iam:EnableMFADevice",
"iam:ListMFADevices",
"iam:ResyncMFADevice"
]
resources = [ "arn:aws:iam::${local.account_id}:user/$${aws:username}" ]
}

statement {
sid = "AllowManageOwnPasswords"
effect = "Allow"
actions = [
"iam:ChangePassword",
"iam:GetUser",
]
resources = [ "arn:aws:iam::${local.account_id}:user/$${aws:username}" ]
}

statement {
sid = "AllowManageOwnAccessKeys"
effect = "Allow"
actions = [
"iam:CreateAccessKey",
"iam:DeleteAccessKey",
"iam:ListAccessKeys",
"iam:UpdateAccessKey"
]
resources = [ "arn:aws:iam::${local.account_id}:user/$${aws:username}" ]
}

statement {
sid = "DenyAllExceptListedIfNoMFA"
effect = "Deny"
not_actions = [
"iam:CreateVirtualMFADevice",
"iam:EnableMFADevice",
"iam:GetUser",
"iam:ListMFADevices",
"iam:ListVirtualMFADevices",
"iam:ResyncMFADevice",
"sts:GetSessionToken"
]
resources = ["*"]
condition {
test = "Bool"
variable = "aws:MultiFactorAuthPresent"
values = ["false"]
}
}
}

resource "aws_iam_group" "mfa_required" {
name = "mfa_required"
}

resource "aws_iam_group_policy" "mfa_required" {
name = "RequireMFA"
group = aws_iam_group.mfa_required.name
policy = data.aws_iam_policy_document.mfa_required_policy.json
}