本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

# IAM：可讓 IAM 使用者自行管理 MFA 裝置
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此範例會示範如何建立身分型政策，允許 IAM 使用者自行管理其[多重要素驗證 (MFA)](id_credentials_mfa.md) 裝置。此政策授予從 AWS API 或 以程式設計方式完成此動作所需的許可 AWS CLI。

**注意**  
如果具有此政策的 IAM 使用者未經 MFA 驗證，則此政策會拒絕存取所有 AWS 動作，但使用 MFA 驗證所需的動作除外。如果您為登入的使用者新增這些許可 AWS，他們可能需要登出再重新登入，才能查看這些變更。

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#### [ JSON ]

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```
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Sid": "AllowListActions",
            "Effect": "Allow",
            "Action": [
                "iam:ListUsers",
                "iam:ListVirtualMFADevices"
            ],
            "Resource": "*"
        },
        {
            "Sid": "AllowUserToCreateVirtualMFADevice",
            "Effect": "Allow",
            "Action": [
                "iam:CreateVirtualMFADevice"
            ],
            "Resource": "arn:aws:iam::*:mfa/*"
        },
        {
            "Sid": "AllowUserToManageTheirOwnMFA",
            "Effect": "Allow",
            "Action": [
                "iam:EnableMFADevice",
                "iam:GetMFADevice",
                "iam:ListMFADevices",
                "iam:ResyncMFADevice"
            ],
            "Resource": "arn:aws:iam::*:user/${aws:username}"
        },
        {
            "Sid": "AllowUserToDeactivateTheirOwnMFAOnlyWhenUsingMFA",
            "Effect": "Allow",
            "Action": [
                "iam:DeactivateMFADevice"
            ],
            "Resource": [
                "arn:aws:iam::*:user/${aws:username}"
            ],
            "Condition": {
                "Bool": {
                    "aws:MultiFactorAuthPresent": "true"
                }
            }
        },
        {
            "Sid": "BlockMostAccessUnlessSignedInWithMFA",
            "Effect": "Deny",
            "NotAction": [
                "iam:CreateVirtualMFADevice",
                "iam:EnableMFADevice",
                "iam:ListMFADevices",
                "iam:ListUsers",
                "iam:ListVirtualMFADevices",
                "iam:ResyncMFADevice"
            ],
            "Resource": "*",
            "Condition": {
                "BoolIfExists": {
                    "aws:MultiFactorAuthPresent": "false"
                }
            }
        }
    ]
}
```

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