Vault/Install

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Vault/Install將介紹Vault的安裝與設定。

安裝

Vault是單執行檔,建議安裝的路徑是/usr/local/bin/vault,這點沒有在官方的文件裡提到,但官方的範例常使用這個路徑[1]

以Linux版的例子來說:

cd /tmp; wget -c https://releases.hashicorp.com/vault/1.4.3/vault_1.4.3_linux_amd64.zip; unzip vault_1.4.3_linux_amd64.zip; sudo cp vault /usr/local/bin/vault; sudo chmod 755 /usr/local/bin/vault

設定KMS、DynamoDB與IAM

DynamoDB

建立一個表格(這邊叫vault),依照官方的設計:

  • Primary partition key設為Path(string)。
  • Primary sort key設為Key(string)。

量很少時可以考慮使用on-demand模式按照讀寫的量計費,而非以保證讀寫的容量計費。

KMS

使用SYMMETRIC_DEFAULT建立即可。

IAM

建立使用者並且產生對應的AWS key(access_keysecret_key)。

接著掛入對應的Inline Policy Policy-Vault-DynamoDB,需要修改帳戶編號(這邊是123456789012)與DynamoDB的表格名稱部份(這邊是vault):

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": [
                "dynamodb:BatchGetItem",
                "dynamodb:BatchWriteItem",
                "dynamodb:PutItem",
                "dynamodb:DescribeTable",
                "dynamodb:DeleteItem",
                "dynamodb:GetItem",
                "dynamodb:Scan",
                "dynamodb:ListTagsOfResource",
                "dynamodb:Query",
                "dynamodb:UpdateItem",
                "dynamodb:DescribeTimeToLive",
                "dynamodb:GetRecords"
            ],
            "Resource": [
                "arn:aws:dynamodb:ap-southeast-1:123456789012:table/vault/stream/*",
                "arn:aws:dynamodb:ap-southeast-1:123456789012:table/vault/index/*",
                "arn:aws:dynamodb:ap-southeast-1:123456789012:table/vault"
            ]
        },
        {
            "Sid": "VisualEditor1",
            "Effect": "Allow",
            "Action": [
                "dynamodb:DescribeReservedCapacityOfferings",
                "dynamodb:ListTables",
                "dynamodb:DescribeReservedCapacity",
                "dynamodb:DescribeLimits"
            ],
            "Resource": "*"
        }
    ]
}

以及Policy-Vault-KMS,需要修改帳戶編號(這邊是123456789012)與KMS的Key ID部份(UUID格式,這邊是01234567-89ab-cdef-0123-456789abcdef):

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": [
                "kms:Decrypt",
                "kms:Encrypt",
                "kms:DescribeKey"
            ],
            "Resource": "arn:aws:kms:ap-southeast-1:123456789012:key/01234567-89ab-cdef-0123-456789abcdef"
        }
    ]
}

建立系統的使用者

建立vault使用者:

sudo groupadd -r vault; sudo useradd -g vault -r vault

設定vault.hcl

先建立對應的路徑:

sudo mkdir /etc/vault.d; sudo touch /etc/vault.d/vault.hcl; sudo chown vault:vault /etc/vault.d/vault.hcl; sudo chmod 600 /etc/vault.d/vault.hcl

Vault的設定檔建議的路徑是/etc/vault.d/vault.hcl,這點沒有在官方的文件裡提到,但官方的範例常使用這個路徑[1]。需要修改自己的網路位置(這邊使用10.10.10.10)。

api_addr = "http://10.10.10.10:8200"
cluster_addr = "http://10.10.10.10:8201"
log_level = "Info"
ui = true

listener "tcp" {    
  address         = "0.0.0.0:8200"
  cluster_address = "10.10.10.10:8201"
  tls_disable     = "true"
}

seal "awskms" {
  region     = "ap-southeast-1"
  access_key = "x"
  secret_key = "x"
  kms_key_id = "x"
}

storage "dynamodb" {
  ha_enabled = "true"
  region     = "ap-southeast-1"
  table      = "vault"
  access_key = "x"
  secret_key = "x"
}

如果是把機器放在AWS內部的話,可以用EC2 Role的方式,就不需要在設定檔內指定access_keysecret_key,Vault會自己去內部網路的169.254.169.254裡抓EC2 Role提供的權限。

設定systemd相關設定

放到/lib/systemd/system/vault.service

[Unit]
Description="HashiCorp Vault - A tool for managing secrets"
Documentation=https://www.vaultproject.io/docs/
Requires=network-online.target
After=network-online.target
ConditionFileNotEmpty=/etc/vault.d/vault.hcl
StartLimitIntervalSec=60
StartLimitBurst=3

[Service]
User=vault
Group=vault
ProtectSystem=full
ProtectHome=read-only
PrivateTmp=yes
PrivateDevices=yes
SecureBits=keep-caps
AmbientCapabilities=CAP_IPC_LOCK
Capabilities=CAP_IPC_LOCK+ep
CapabilityBoundingSet=CAP_SYSLOG CAP_IPC_LOCK
NoNewPrivileges=yes
ExecStart=/usr/local/bin/vault server -config=/etc/vault.d/vault.hcl
ExecReload=/bin/kill --signal HUP $MAINPID
KillMode=process
KillSignal=SIGINT
Restart=on-failure
RestartSec=5
TimeoutStopSec=30
StartLimitInterval=60
StartLimitIntervalSec=60
StartLimitBurst=3
LimitNOFILE=65536
LimitMEMLOCK=infinity

[Install]
WantedBy=multi-user.target

然後設定開機啟動,並且馬上啟動:

sudo systemctl daemon-reload; sudo systemctl enable vault; sudo service vault start

初始化

第一次執行時需要初始化,在其中一台機器執行:

vault operator init -recovery-shares=1 -recovery-threshold=1 -address=http://127.0.0.1:8200

這邊會產生root token讓使用者操作。

設定ELB

這邊建議用ALB:

  • 使用ACM管理HTTPS所需要的憑證。
  • 使用/v1/sys/health的狀態設定health check,只有active node會傳回200[2]

檢修

vault.hcl內的log_level改為Debug後,可以在/var/log/syslog看到不少資訊。

參考文獻

  1. 1.0 1.1 Vault Deployment Guide. [2020-07-15] (English). 
  2. /sys/health - HTTP API. [2020-07-17] (English). 

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