RGW奇淫技巧-玩转system特权

开启system特权

root@demohost:/home/user# radosgw-admin user modify --system=1 --uid=s3user 
{
    "user_id": "s3user",
    "display_name": "s3user",
    "email": "",
    "suspended": 0,
    "max_buckets": 1000,
    "auid": 0,
    "subusers": [],
    "keys": [
        {
            "user": "s3user",
            "access_key": "",
            "secret_key": ""
        }
    ],
    "swift_keys": [],
    "caps": [],
    "op_mask": "read, write, delete",
    "system": "true", #开启了system特权
    "default_placement": "",
    "placement_tags": [],
    "bucket_quota": {
        "enabled": false,
        "max_size_kb": -1,
        "max_objects": -1
    },
    "user_quota": {
        "enabled": false,
        "max_size_kb": -1,
        "max_objects": -1
    },
    "temp_url_keys": []
}

关闭system特权

root@demohost:/home/user# radosgw-admin user modify --system=0 --uid=s3user 
{
    "user_id": "s3user",
    "display_name": "s3user",
    "email": "",
    "suspended": 0,
    "max_buckets": 1000,
    "auid": 0,
    "subusers": [],
    "keys": [
        {
            "user": "s3user",
            "access_key": "",
            "secret_key": ""
        }
    ],
    "swift_keys": [],
    "caps": [],
    "op_mask": "read, write, delete",
    "default_placement": "",
    "placement_tags": [],
    "bucket_quota": {
        "enabled": false,
        "max_size_kb": -1,
        "max_objects": -1
    },
    "user_quota": {
        "enabled": false,
        "max_size_kb": -1,
        "max_objects": -1
    },
    "temp_url_keys": []
}

开system特权以后，create_bucket请求的body会返回对应bucket的各种隐藏属性

python的测试代码如下

# -*- coding: utf-8 -*-
from boto.s3.connection import S3Connection
import boto
import os

bucket_name = 'user-bucket1'
access_key = ''
secret_key = ''
endpoint = 's3.ceph.work'

conn = boto.connect_s3(
    aws_access_key_id=access_key,
    aws_secret_access_key=secret_key,
    host=endpoint,
    is_secure=False,
    calling_format=boto.s3.connection.OrdinaryCallingFormat(),
    validate_certs=True,
)

bucket = conn.create_bucket(bucket_name)

开启之前，response的body内容为空

开启以后，bucket隐藏的的metadata全部都暴露出来了

最后说一句，这个system权限很大，不要随便开，容易造成权限扩大和隐藏信息泄露。