问题

需要对IAM用户强制使用MFA方式进行登陆。

步骤

创建强制MFA登陆策略

找到策略创建入口，如下图：

将下述内容json策略内容，复制到编辑器里面，具体内容和操作如下：

{
	"Version": "2012-10-17",
	"Statement": [
		{
			"Sid": "AllowViewAccountInfo",
			"Effect": "Allow",
			"Action": [
				"iam:GetAccountPasswordPolicy",
				"iam:ListVirtualMFADevices"
			],
			"Resource": "*"
		},
		{
			"Sid": "AllowManageOwnPasswords",
			"Effect": "Allow",
			"Action": [
				"iam:ChangePassword",
				"iam:GetUser"
			],
			"Resource": "arn:aws-cn:iam::*:user/${aws:username}"
		},
		{
			"Sid": "AllowManageOwnAccessKeys",
			"Effect": "Allow",
			"Action": [
				"iam:CreateAccessKey",
				"iam:DeleteAccessKey",
				"iam:ListAccessKeys",
				"iam:UpdateAccessKey",
				"iam:GetAccessKeyLastUsed"
			],
			"Resource": "arn:aws-cn:iam::*:user/${aws:username}"
		},
		{
			"Sid": "AllowManageOwnSigningCertificates",
			"Effect": "Allow",
			"Action": [
				"iam:DeleteSigningCertificate",
				"iam:ListSigningCertificates",
				"iam:UpdateSigningCertificate",
				"iam:UploadSigningCertificate"
			],
			"Resource": "arn:aws-cn:iam::*:user/${aws:username}"
		},
		{
			"Sid": "AllowManageOwnSSHPublicKeys",
			"Effect": "Allow",
			"Action": [
				"iam:DeleteSSHPublicKey",
				"iam:GetSSHPublicKey",
				"iam:ListSSHPublicKeys",
				"iam:UpdateSSHPublicKey",
				"iam:UploadSSHPublicKey"
			],
			"Resource": "arn:aws-cn:iam::*:user/${aws:username}"
		},
		{
			"Sid": "AllowManageOwnGitCredentials",
			"Effect": "Allow",
			"Action": [
				"iam:CreateServiceSpecificCredential",
				"iam:DeleteServiceSpecificCredential",
				"iam:ListServiceSpecificCredentials",
				"iam:ResetServiceSpecificCredential",
				"iam:UpdateServiceSpecificCredential"
			],
			"Resource": "arn:aws-cn:iam::*:user/${aws:username}"
		},
		{
			"Sid": "AllowManageOwnVirtualMFADevice",
			"Effect": "Allow",
			"Action": [
				"iam:CreateVirtualMFADevice"
			],
			"Resource": "arn:aws-cn:iam::*:mfa/*"
		},
		{
			"Sid": "AllowManageOwnUserMFA",
			"Effect": "Allow",
			"Action": [
				"iam:DeactivateMFADevice",
				"iam:EnableMFADevice",
				"iam:ListMFADevices",
				"iam:ResyncMFADevice"
			],
			"Resource": "arn:aws-cn:iam::*:user/${aws:username}"
		},
		{
			"Sid": "DenyAllExceptListedIfNoMFA",
			"Effect": "Deny",
			"NotAction": [
				"iam:CreateVirtualMFADevice",
				"iam:EnableMFADevice",
				"iam:GetUser",
				"iam:GetMFADevice",
				"iam:ListMFADevices",
				"iam:ListVirtualMFADevices",
				"iam:ResyncMFADevice",
				"sts:GetSessionToken"
			],
			"Resource": "*",
			"Condition": {
				"BoolIfExists": {
					"aws:MultiFactorAuthPresent": "false"
				}
			}
		}
	]
}

设置策略名称和描述，审计完后，没问题就可以点击创建策略按钮了。具体如下图：

设置用户组权限策略

强制MFA策略创建成功后，将该策略添加到需要使用到用户组中，即对添加了上述强制MFA策略的用户组用户启用强制MFA方式登录。添加步骤如下图：

找到Force_MFA策略，进行添加如下图：

注意

新的用户，首次登录不要强制修改密码，不然这个策略一启用，这个新用户就永远在强制修改密码页面了。还有一点就是绑定MFA的过程中，千万不要刷新页面，如果中途刷新了页面，又没有完全走完绑定流程，最后就只能找管理员去帮新用户删MFA设备了。具体命令如下：
查找MFA设备命令：

$ aws iam list-virtual-mfa-devices | grep zyl
arn:aws:iam::xxx:mfa/zyl

删除MFA设备命令：

aws iam delete-virtual-mfa-device --serial-number arn:aws:iam::xxx:mfa/zyl

总结

强制MFA设备策略，虽然，安全了，但是AWS中国登录的页面，并不会引导新用户去MFA绑定页面进行绑定，而且中途中断的话，得拼命找管理员删设备。就这两点我觉得这个产品还有很大提升的地方。

参考

• IAM 教程：允许用户管理其凭证和 MFA 设置
• AWS：允许使用 MFA 完成身份验证的 IAM 用户在“安全凭证”页面上管理自己的凭证。
• [SOLVED] MFA Entity already exists Error in AWS IAM
• MFA device already exists. の対応方法