172 lines
7 KiB
Plaintext
172 lines
7 KiB
Plaintext
---
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layout: docs
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page_title: MSSQL - Database - Secrets Engines
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description: |-
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MSSQL is one of the supported plugins for the database secrets engine. This
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plugin generates database credentials dynamically based on configured roles
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for the MSSQL database.
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---
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# MSSQL Database Secrets Engine
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MSSQL is one of the supported plugins for the database secrets engine. This
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plugin generates database credentials dynamically based on configured roles for
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the MSSQL database.
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See the [database secrets engine](/docs/secrets/databases) docs for
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more information about setting up the database secrets engine.
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## Capabilities
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| Plugin Name | Root Credential Rotation | Dynamic Roles | Static Roles | Username Customization |
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| ----------------------- | ------------------------ | ------------- | ------------ | ---------------------- |
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| `mssql-database-plugin` | Yes | Yes | Yes | Yes (1.7+) |
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## Setup
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1. Enable the database secrets engine if it is not already enabled:
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```text
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$ vault secrets enable database
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Success! Enabled the database secrets engine at: database/
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```
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By default, the secrets engine will enable at the name of the engine. To
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enable the secrets engine at a different path, use the `-path` argument.
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1. Configure Vault with the proper plugin and connection information:
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```text
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$ vault write database/config/my-mssql-database \
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plugin_name=mssql-database-plugin \
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connection_url='sqlserver://{{username}}:{{password}}@localhost:1433' \
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allowed_roles="my-role" \
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username="vaultuser" \
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password="yourStrong(!)Password"
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```
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~> Note: The example above demonstrates a connection with SQL server user named `vaultuser`, although the user `vaultuser` might be Windows Authentication user part of Active Directory domain, for example: `DOMAIN\vaultuser`.
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In this case, we've configured Vault with the user "vaultuser" and password
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"yourStrong(!)Password", connecting to an instance at "localhost" on port 1433. It is
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not necessary that Vault has the vaultuser login, but the user must have privileges
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to create logins and manage processes. The fixed server roles
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`securityadmin` and `processadmin` are examples of built-in roles that grant
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these permissions. The user also must have privileges to create database
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users and grant permissions in the databases that Vault manages. The fixed
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database roles `db_accessadmin` and `db_securityadmin` are examples or
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built-in roles that grant these permissions.
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1. Configure a role that maps a name in Vault to an SQL statement to execute to
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create the database credential:
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```text
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$ vault write database/roles/my-role \
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db_name=my-mssql-database \
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creation_statements="CREATE LOGIN [{{name}}] WITH PASSWORD = '{{password}}';\
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CREATE USER [{{name}}] FOR LOGIN [{{name}}];\
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GRANT SELECT ON SCHEMA::dbo TO [{{name}}];" \
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default_ttl="1h" \
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max_ttl="24h"
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Success! Data written to: database/roles/my-role
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```
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~> **Be aware!** If no `revocation_statement` is supplied,
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vault will execute the default revocation procedure.
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In larger databases, this might cause connection timeouts.
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Please specify a revocation statement in such a scenario.
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## Usage
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After the secrets engine is configured and a user/machine has a Vault token with
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the proper permission, it can generate credentials.
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1. Generate a new credential by reading from the `/creds` endpoint with the name
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of the role:
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```text
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$ vault read database/creds/my-role
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Key Value
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--- -----
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lease_id database/creds/my-role/2f6a614c-4aa2-7b19-24b9-ad944a8d4de6
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lease_duration 1h
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lease_renewable true
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password wJKpk9kg-T1Ma7qQfS8y
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username v-vaultuser-my-role-r7kCtKGGr3eYQP1OGR6G-1602542258
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```
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## Example for Azure SQL Database
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Here is a complete example using Azure SQL Database. Note that databases in Azure SQL Database are [contained databases](https://docs.microsoft.com/en-us/sql/relational-databases/databases/contained-databases) and that we do not create a login for the user; instead, we associate the password directly with the user itself. Also note that you will need a separate connection and role for each Azure SQL database for which you want to generate dynamic credentials. You can use a single database backend mount for all these databases or use a separate mount for of them. In this example, we use a custom path for the database backend.
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First, we mount a database backend at the azuresql path with `vault secrets enable -path=azuresql database`. Then we configure a connection called "testvault" to connect to a database called "test-vault", using "azuresql" at the beginning of our path:
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```shell-session
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$ vault write azuresql/config/testvault \
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plugin_name=mssql-database-plugin \
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connection_url='server=hashisqlserver.database.windows.net;port=1433;user id=admin;password=pAssw0rd;database=test-vault;app name=vault;' \
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allowed_roles="test"
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```
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Now we add a role called "test" for use with the "testvault" connection:
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```shell-session
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$ vault write azuresql/roles/test \
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db_name=testvault \
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creation_statements="CREATE USER [{{name}}] WITH PASSWORD = '{{password}}';" \
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revocation_statements="DROP USER IF EXISTS [{{name}}]" \
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default_ttl="1h" \
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max_ttl="24h"
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```
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We can now use this role to dynamically generate credentials for the Azure SQL database, test-vault:
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```shell-session
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$ vault read azuresql/creds/test
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Key Value
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--- -----
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lease_id azuresql/creds/test/2e5b1e0b-a081-c7e1-5622-39f58e79a719
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lease_duration 1h0m0s
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lease_renewable true
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password cZ-BJy-SqO5tKwazAuUP
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username v-token-test-tr2t4x9pxvq1z8878s9s-1513446795
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```
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When we no longer need the backend, we can unmount it with `vault unmount azuresql`. Now, you can use the MSSQL Database Plugin with your Azure SQL databases.
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## Amazon RDS
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The MSSQL plugin supports databases running on [Amazon RDS](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_SQLServer.html),
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but there are differences that need to be accommodated. A key limitation is that Amazon RDS doesn't support
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the "sysadmin" role, which is used by default during Vault's revocation process for MSSQL. The workaround
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is to add custom revocation statements to roles, for example:
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```shell
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vault write database/roles/my-role revocation_statements="\
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USE my_database; \
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IF EXISTS \
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(SELECT name \
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FROM sys.database_principals \
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WHERE name = N'{{name}}') \
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BEGIN \
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DROP USER [{{name}}] \
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END \
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IF EXISTS \
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(SELECT name \
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FROM master.sys.server_principals \
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WHERE name = N'{{name}}') \
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BEGIN \
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DROP LOGIN [{{name}}] \
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END"
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```
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## API
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The full list of configurable options can be seen in the [MSSQL database
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plugin API](/api-docs/secret/databases/mssql) page.
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For more information on the database secrets engine's HTTP API please see the
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[Database secrets engine API](/api-docs/secret/databases) page.
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