Terraform：assume_role 问题

Question

几天来我一直在努力解开这个谜团，但我并不高兴。基本上，Terraform 无法承担角色 并且失败：

Initializing the backend...
2019/10/28 09:13:09 [DEBUG] New state was assigned lineage "136dca1a-b46b-1e64-0ef2-efd6799b4ebc"
2019/10/28 09:13:09 [INFO] Setting AWS metadata API timeout to 100ms
2019/10/28 09:13:09 [INFO] Ignoring AWS metadata API endpoint at default location as it doesn't return any instance-id
2019/10/28 09:13:09 [INFO] AWS Auth provider used: "SharedCredentialsProvider"
2019/10/28 09:13:09 [INFO] Attempting to AssumeRole arn:aws:iam::72xxxxxxxxxx:role/terraform-admin-np (SessionName: "terra_cnp", ExternalId: "", Policy: "")

Error: The role "arn:aws:iam::72xxxxxxxxxx:role/terraform-admin-np" cannot be assumed.

  There are a number of possible causes of this - the most common are:
    * The credentials used in order to assume the role are invalid
    * The credentials do not have appropriate permission to assume the role
    * The role ARN is not valid

在 AWS 中：

我有角色：terraform-admin-np 和 2 AWS 托管策略：AmazonS3FullAccess & AdministratorAccess 以及与此的信任关系：

  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::72xxxxxxxxxx:root"
      },
      "Action": "sts:AssumeRole"
    }
  ]
}

然后我有一个用户附有政策文件：

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "TfFullAccessSts",
            "Effect": "Allow",
            "Action": [
                "sts:AssumeRole",
                "sts:DecodeAuthorizationMessage",
                "sts:AssumeRoleWithSAML",
                "sts:AssumeRoleWithWebIdentity"
            ],
            "Resource": "*"
        },
        {
            "Sid": "TfFullAccessAll",
            "Effect": "Allow",
            "Action": "*",
            "Resource": [
                "*",
                "arn:aws:ec2:region:account:network-interface/*"
            ]
        }
    ]
}

和一个 S3 存储桶：txxxxxxxxxxxxxxte 附有此策略文档：

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "TFStateListBucket",
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::72xxxxxxxxxx:root"
            },
            "Action": "s3:ListBucket",
            "Resource": "arn:aws:s3:::txxxxxxxxxxxxxxte"
        },
        {
            "Sid": "TFStateGetPutObject",
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::72xxxxxxxxxx:root"
            },
            "Action": [
                "s3:GetObject",
                "s3:PutObject"
            ],
            "Resource": "arn:aws:s3:::txxxxxxxxxxxxxxte/*"
        }
    ]
}

在 Terraform 中：

来自 provider.tf 的片段：

###---- Default Backend and Provider config values -----------###
terraform {
  required_version = ">= 0.12"
  backend "s3" {
    encrypt  = true
  }
}

provider "aws" {
  region  = var.region
  version = "~> 2.20"
  profile = var.profile
  assume_role {
    role_arn     = var.role_arn
    session_name = var.session_name
  }
}

来自 tgw_cnp.tfvars 后端配置的代码段：

## S3 backend config
key             = "backend/tgw_cnp_state"
bucket          = "txxxxxxxxxxxxxxte"
region          = "us-east-2"
profile         = "local-tgw"
role_arn        = "arn:aws:iam::72xxxxxxxxxx:role/terraform-admin-np"
session_name    = "terra_cnp"

然后运行这样：

TF_LOG=debug terraform init -backend-config=tgw_cnp.tfvars

有了这个，我可以毫无问题地使用 AWS CLI 担任角色：

# aws --profile local-tgw sts assume-role --role-arn "arn:aws:iam::72xxxxxxxxxx:role/terraform-admin-np" --role-session-name AWSCLI
{
    "Credentials": {
        "AccessKeyId": "AXXXXXXXXXXXXXXXXXXA",
        "SecretAccessKey": "UixxxxxxxxxxxxxxxxxxxxxxxxxxxxMt",
        "SessionToken": "FQoGZXIvYXdzEJb//////////wEaD......./5LFwNWf6riiNw9vtBQ==",
        "Expiration": "2019-10-28T13:39:41Z"
    },
    "AssumedRoleUser": {
        "AssumedRoleId": "AROA2P7ZON5TSWMOBQEBC:AWSCLI",
        "Arn": "arn:aws:sts::72xxxxxxxxxx:assumed-role/terraform-admin-np/AWSCLI"
    }
}

但 terraform 因上述错误而失败。知道我做错了什么吗？

Answer 1

好的，回答我自己的问题........ 现在它起作用了。我犯了一个愚蠢的错误 - tgw_cnp.tfvars 中的 region 是错误的，我一直在漏掉它。在 AWS CLI 中，因为我不必指定 region（它是从配置文件中获取的），所以它可以正常工作，但在 TF 中我指定了区域并且值为错误，因此失败。错误报告中的建议有点误导。

我可以确认上面的配置工作正常。现在一切都很好。

Terraform：assume_role 问题

Terraform: Issue with assume_role

amazon-s3

amazon-web-services

terraform

assume-role

在 AWS 中：

在 Terraform 中：