Restricting Snowflake access to specific IP ranges

Question

Pulumi · Accepted Answer

To restrict access to Snowflake to specific IP ranges, Snowflake's Network Policies feature can be utilized. Network Policies in Snowflake allow you to define allowable IP address ranges that can be used to access your Snowflake account. This kind of security measure can ensure that only devices with an IP address within the approved ranges can log in to your Snowflake environment, enhancing the security of your data.

Pulumi's Snowflake provider includes resources for managing Snowflake configurations, including network policies. Below, we will define a Pulumi program using the `snowflake.NetworkPolicy` resource to create a Network Policy that will restrict access to specified IP ranges.

Here is a Pulumi TypeScript program that defines a Snowflake Network Policy:

```typescript
import * as pulumi from '@pulumi/pulumi';
import * as snowflake from '@pulumi/snowflake';

// Create a new Snowflake Network Policy
const restrictedAccessPolicy = new snowflake.NetworkPolicy("restrictedAccessPolicy", {
    // Network policy name
    name: "office-network-policy",
    
    // Define allowed IP list
    allowedIpList: [
        "192.168.1.1/32", // Single IP example
        "10.0.0.0/24",    // Range of IPs example
    ],
    
    // Optionally define blocked IP list
    blockedIpList: [
        "0.0.0.0/0", // This is just an example to block all other IPs
    ],
    
    // Optionally set the default policy for all users
    // If set to true, it applies to all users unless specific user-level network policy overrides it
    setForAccount: false,
});

// Export the Network Policy Name
export const networkPolicyName = restrictedAccessPolicy.name;
```

### Explanation:
- We import the necessary Pulumi libraries and Snowflake provider package to work with Snowflake resources.
- We create a new instance of `snowflake.NetworkPolicy` which represents the network policy configuration we want to implement in Snowflake.
- `allowedIpList` is a list of CIDR-formatted IP ranges that will have access to Snowflake. Replace these values with the actual IP ranges that you wish to allow access from.
- `blockedIpList` can optionally be used to explicitly deny access from certain IP ranges. You can block all other IPs by using `'0.0.0.0/0'` as an example.
- `setForAccount` is a boolean flag that, when set to `true`, makes the policy apply to all users by default - unless a user has a specific network policy assigned at the user level.
- Finally, we export the `networkPolicyName` as a stack output. This can be used to reference the network policy name outside of this Pulumi program.

After running this program with Pulumi CLI and assuming you have the right Snowflake provider setup with appropriate credentials, this code will configure the specified network policy in your Snowflake account to restrict access as defined.

Please ensure to replace the example IP ranges with your actual secure IP ranges that you want to specify for access to your Snowflake data warehouse.