s3tk:一款针对Amazon S3的安全审计套件

2020-01-15 68573人围观 ,发现 1 个不明物体 网络安全

s3tk是一款针对Amazon S3的安全审计套件,广大安全研究人员可以使用s3tk来对Amazon S3 Bucket进行安全测试。

工具安装

广大研究人员可以使用pip来完成s3tk的安装:

pip install s3tk

研究人员可以使用AWS CLI命令行工具来配置AWS凭证:

pip install awscli

aws configure

工具使用命令

安全扫描

可扫描的Bucket组件如下:

1、公开ACL

2、公开策略

3、屏蔽的公开访问

4、启用的登录

5、版本修改

6、默认加密

s3tk scan

针对特定Bucket运行扫描:

s3tk scan my-bucket my-bucket-2

支持通配符:

s3tk scan "my-bucket*"

跳过日志和默认加密:

s3tk scan --skip-logging --skip-versioning --skip-default-encryption

获取邮件通知(通过SNS):

s3tk scan --sns-topic arn:aws:sns:...

枚举策略

枚举Bucket策略:

s3tk list-policy

针对特定Bucket运行扫描:

s3tk list-policy my-bucket my-bucket-2

显示名称:

s3tk list-policy --named

设置策略:

s3tk set-policy my-bucket --no-object-acl

删除策略:

s3tk delete-policy my-bucket

屏蔽公开访问:

s3tk block-public-access my-bucket my-bucket-2

启用默认加密

针对所有Bucket启用默认加密:

s3tk enable-default-encryption

仅针对特定Bucket启用:

s3tk enable-default-encryption my-bucket my-bucket-2

扫描对象ACL

扫描目标Bucket中所有对象的ACL:

s3tk scan-object-acl my-bucket

扫描特定对象:

s3tk scan-object-acl my-bucket --only "*.pdf"

排除特定对象:

s3tk scan-object-acl my-bucket --except "*.jpg"

扫描DNS

s3tk scan-dns

凭证

用户凭证可以在“~/.aws/credentials”中或环境变量中设置,我们可以使用下列命令设置一个profile:

AWS_PROFILE=your-profile s3tk

IAM策略

下面给出的是每一条命令所需的权限,用户只需要将相应权限在下列代码中声明即可:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "Scan",
            "Effect": "Allow",
            "Action": [
                "s3:ListAllMyBuckets",
                "s3:GetBucketAcl",
                "s3:GetBucketPolicy",
                "s3:GetBucketPublicAccessBlock",
                "s3:GetBucketLogging",
                "s3:GetBucketVersioning",
                "s3:GetEncryptionConfiguration"
            ],
            "Resource": "*"
        },
        {
            "Sid": "ScanDNS",
            "Effect": "Allow",
            "Action": [
                "s3:ListAllMyBuckets",
                "route53:ListHostedZones",
                "route53:ListResourceRecordSets"
            ],
            "Resource": "*"
        },
        {
            "Sid": "ListPolicy",
            "Effect": "Allow",
            "Action": [
                "s3:ListAllMyBuckets",
                "s3:GetBucketPolicy"
            ],
            "Resource": "*"
        },
        {
            "Sid": "SetPolicy",
            "Effect": "Allow",
            "Action": [
                "s3:PutBucketPolicy"
            ],
            "Resource": "*"
        },
        {
            "Sid": "DeletePolicy",
            "Effect": "Allow",
            "Action": [
                "s3:DeleteBucketPolicy"
            ],
            "Resource": "*"
        },
        {
            "Sid": "BlockPublicAccess",
            "Effect": "Allow",
            "Action": [
                "s3:ListAllMyBuckets",
                "s3:PutBucketPublicAccessBlock"
            ],
            "Resource": "*"
        },
        {
            "Sid": "EnableLogging",
            "Effect": "Allow",
            "Action": [
                "s3:ListAllMyBuckets",
                "s3:PutBucketLogging"
            ],
            "Resource": "*"
        },
        {
            "Sid": "EnableVersioning",
            "Effect": "Allow",
            "Action": [
                "s3:ListAllMyBuckets",
                "s3:PutBucketVersioning"
            ],
            "Resource": "*"
        },
        {
            "Sid": "EnableDefaultEncryption",
            "Effect": "Allow",
            "Action": [
                "s3:ListAllMyBuckets",
                "s3:PutEncryptionConfiguration"
            ],
            "Resource": "*"
        },
        {
            "Sid": "ResetObjectAcl",
            "Effect": "Allow",
            "Action": [
                "s3:ListBucket",
                "s3:GetObjectAcl",
                "s3:PutObjectAcl"
            ],
            "Resource": [
                "arn:aws:s3:::my-bucket",
                "arn:aws:s3:::my-bucket/*"
            ]
        },
        {
            "Sid": "Encrypt",
            "Effect": "Allow",
            "Action": [
                "s3:ListBucket",
                "s3:GetObject",
                "s3:PutObject"
            ],
            "Resource": [
                "arn:aws:s3:::my-bucket",
                "arn:aws:s3:::my-bucket/*"
            ]
        },
        {
            "Sid": "DeleteUnencryptedVersions",
            "Effect": "Allow",
            "Action": [
                "s3:ListBucketVersions",
                "s3:GetObjectVersion",
                "s3:DeleteObjectVersion"
            ],
            "Resource": [
                "arn:aws:s3:::my-bucket",
                "arn:aws:s3:::my-bucket/*"
            ]
        }
    ]
}

访问日志

Amazon Athena适用于查询S3日志,创建下列表:

CREATE EXTERNAL TABLE my_bucket (
    bucket_owner string,
    bucket string,
    time string,
    remote_ip string,
    requester string,
    request_id string,
    operation string,
    key string,
    request_verb string,
    request_url string,
    request_proto string,
    status_code string,
    error_code string,
    bytes_sent string,
    object_size string,
    total_time string,
    turn_around_time string,
    referrer string,
    user_agent string,
    version_id string
)
ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.RegexSerDe'
WITH SERDEPROPERTIES (
    'serialization.format' = '1',
    'input.regex' = '([^ ]*) ([^ ]*) \\[(.*?)\\] ([^ ]*) ([^ ]*) ([^ ]*) ([^ ]*) ([^ ]*) \\\"([^ ]*) ([^ ]*) (- |[^ ]*)\\\" (-|[0-9]*) ([^ ]*) ([^ ]*) ([^ ]*) ([^ ]*) ([^ ]*) ([^ ]*) (\"[^\"]*\\") ([^ ]*)$'
) LOCATION 's3://my-s3-logs/my-bucket/';

修改最后一行代码,并指向你的日志Bucket:

SELECT
    date_parse(time, '%d/%b/%Y:%H:%i:%S +0000') AS time,
    request_url,
    remote_ip,
    user_agent
FROM
    my_bucket
WHERE
    requester = '-'
    AND status_code LIKE '2%'
    AND request_url LIKE '/some-keys%'
ORDER BY 1

CloudTrail日志

Amazon Athena同样可以用于查询CloudTrail日志,创建一个表:

CREATE EXTERNAL TABLE cloudtrail_logs (
    eventversion STRING,
    userIdentity STRUCT<
        type:STRING,
        principalid:STRING,
        arn:STRING,
        accountid:STRING,
        invokedby:STRING,
        accesskeyid:STRING,
        userName:String,
        sessioncontext:STRUCT<
            attributes:STRUCT<
                mfaauthenticated:STRING,
                creationdate:STRING>,
            sessionIssuer:STRUCT<
                type:STRING,
                principalId:STRING,
                arn:STRING,
                accountId:STRING,
                userName:STRING>>>,
    eventTime STRING,
    eventSource STRING,
    eventName STRING,
    awsRegion STRING,
    sourceIpAddress STRING,
    userAgent STRING,
    errorCode STRING,
    errorMessage STRING,
    requestId  STRING,
    eventId  STRING,
    resources ARRAY<STRUCT<
        ARN:STRING,
        accountId:STRING,
        type:STRING>>,
    eventType STRING,
    apiVersion  STRING,
    readOnly BOOLEAN,
    recipientAccountId STRING,
    sharedEventID STRING,
    vpcEndpointId STRING,
    requestParameters STRING,
    responseElements STRING,
    additionalEventData STRING,
    serviceEventDetails STRING
)
ROW FORMAT SERDE 'com.amazon.emr.hive.serde.CloudTrailSerde'
STORED  AS INPUTFORMAT 'com.amazon.emr.cloudtrail.CloudTrailInputFormat'
OUTPUTFORMAT 'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat'
LOCATION  's3://my-cloudtrail-logs/'

修改最后一行代码,并指向你的CloudTrail日志Bucket:

SELECT
    eventTime,
    eventName,
    userIdentity.userName,
    requestParameters
FROM
    cloudtrail_logs
WHERE
    eventName LIKE '%Bucket%'
ORDER BY 1

Bucket策略

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Deny",
            "Principal": "*",
            "Action": "s3:PutObjectAcl",
            "Resource": "arn:aws:s3:::my-bucket/*"
        }
    ]
}

工具更新

运行下列命令:

pip install s3tk --upgrade

使用Master,可运行下列命令:

pip install git+https://github.com/ankane/s3tk.git --upgrade

Docker运行

运行下列命令:

docker run -it ankane/s3tk aws configure

提交你的凭证:

docker commit $(docker ps -l -q) my-s3tk

接下来,运行下列命令:

docker run -it my-s3tk s3tk scan

工具运行截图

项目地址

s3tk:【GitHub传送门

* 参考来源:ankane,FB小编Alpha_h4ck编译,转载请注明来自FreeBuf.COM

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