Free Template for Masking Data in Snowflake

If you need a quick way to create masking policies in Snowflake, this template allows you to save a stored procedure that you can call any time create new or append roles to an existing masking policy. Enjoy!

Step 1 - Create masking policy stored procedure

Run the following stored procedure in your Snowflake account, as ACCOUNTADMIN.

Copy Text

CREATE OR REPLACE PROCEDURE ADD_MASKING(DBNAME VARCHAR, SCHEMANAME VARCHAR, TABLENAME VARCHAR, COLUMNNAME VARCHAR, ROLENAME VARCHAR) 

RETURNS STRING 

LANGUAGE JAVASCRIPT 

VOLATILE 

EXECUTE AS CALLER 

AS $$ 

  function execQuery(queryString) { 

    return snowflake.execute({sqlText:queryString}); 

  } 

  // This script must execute as ACCOUNTADMIN so that 

  // we can grant the target role permissions on objects 

  // that the target role may not even be able to see. 

  try { 

    execQuery("USE ROLE ACCOUNTADMIN"); 

  } catch (error) { 

    return 'You must call this stored procedure with a user and role that can assume role ACCOUNTADMIN: ' + error; 

  } 


  //try to append to masking policy if it exists 

  try { 

    //get masking policies 

    var masks = execQuery(`SHOW MASKING POLICIES;`); 

    var name = execQuery(`select "name" as NAME from table(result_scan(last_query_id())) WHERE NAME='SP_FULL_MASK_${COLUMNNAME}'`); 

     

    if (name.getRowCount() != 0) 

    { 

      var result = execQuery(`DESCRIBE MASKING POLICY SP_FULL_MASK_${COLUMNNAME};`); 

      result.next(); 

      var maskingBody = result.getColumnValueAsString('body'); 

 

      //if not already in the masking policy 

      if (maskingBody.indexOf(ROLENAME) == -1) 

      { 

        //insert it in the masking Body 

        //find first when 

        var index = maskingBody.indexOf('when'); 

        maskingBody = maskingBody.slice(0, index) + `when current_role() in ('${ROLENAME}') then '*********'\n\t\t` + maskingBody.slice(index); 

        //alter the masking policy 

        execQuery(`alter masking policy if exists SP_FULL_MASK_${COLUMNNAME} set body -> ${maskingBody}`); 

        return `Successfly added role ${ROLENAME} to mask`; 

      } 

      else { 

        return `Column ${COLUMNNAME} is already masked for ${ROLENAME}`; 

      } 

       

    }   

     

  } catch (error) { 

    return error; 

  } 

 

  //create masking policy if it doesn't exist 

  try { 

    execQuery(` 

      create masking policy if not exists SP_FULL_MASK_${COLUMNNAME} as (val string) returns string -> 

      case 

        when current_role() in ('${ROLENAME}') then '*********' 

        else val 

      end;` 

    ); 

    //apply the policy 

    execQuery(`alter table if exists ${DBNAME}.${SCHEMANAME}.${TABLENAME} modify column ${COLUMNNAME} set masking policy SP_FULL_MASK_${COLUMNNAME};`); 

     

    return `Successfly masked column ${COLUMNNAME} for role ${ROLENAME}`; 

  } catch (error) { 

    return error; 

  } 

  

  return `Successfly masked column ${COLUMNNAME} for role ${ROLENAME}`; 

$$;

Step 2 - Mask data!

Copy Text

‍

Want to make masking data in Snowflake even easier?

Do it in ALTR!

ALTR lets you mask data in Snowflake without writing any code, so creating and maintaining masking policies is easy and doesn’t take up your time. ALTR does a lot more, too, including automatically classifying data, controlling access to data, and reporting on data usage, all for free.

‍

Start masking data in Snowflake now

‍

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Free Template for Masking Data in Snowflake

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Step 1 - Create masking policy stored procedure

Run the following stored procedure in your Snowflake account, as ACCOUNTADMIN.

Copy Text

CREATE OR REPLACE PROCEDURE ADD_MASKING(DBNAME VARCHAR, SCHEMANAME VARCHAR, TABLENAME VARCHAR, COLUMNNAME VARCHAR, ROLENAME VARCHAR) 

RETURNS STRING 

LANGUAGE JAVASCRIPT 

VOLATILE 

EXECUTE AS CALLER 

AS $$ 

  function execQuery(queryString) { 

    return snowflake.execute({sqlText:queryString}); 

  } 

  // This script must execute as ACCOUNTADMIN so that 

  // we can grant the target role permissions on objects 

  // that the target role may not even be able to see. 

  try { 

    execQuery("USE ROLE ACCOUNTADMIN"); 

  } catch (error) { 

    return 'You must call this stored procedure with a user and role that can assume role ACCOUNTADMIN: ' + error; 

  } 


  //try to append to masking policy if it exists 

  try { 

    //get masking policies 

    var masks = execQuery(`SHOW MASKING POLICIES;`); 

    var name = execQuery(`select "name" as NAME from table(result_scan(last_query_id())) WHERE NAME='SP_FULL_MASK_${COLUMNNAME}'`); 

     

    if (name.getRowCount() != 0) 

    { 

      var result = execQuery(`DESCRIBE MASKING POLICY SP_FULL_MASK_${COLUMNNAME};`); 

      result.next(); 

      var maskingBody = result.getColumnValueAsString('body'); 

 

      //if not already in the masking policy 

      if (maskingBody.indexOf(ROLENAME) == -1) 

      { 

        //insert it in the masking Body 

        //find first when 

        var index = maskingBody.indexOf('when'); 

        maskingBody = maskingBody.slice(0, index) + `when current_role() in ('${ROLENAME}') then '*********'\n\t\t` + maskingBody.slice(index); 

        //alter the masking policy 

        execQuery(`alter masking policy if exists SP_FULL_MASK_${COLUMNNAME} set body -> ${maskingBody}`); 

        return `Successfly added role ${ROLENAME} to mask`; 

      } 

      else { 

        return `Column ${COLUMNNAME} is already masked for ${ROLENAME}`; 

      } 

       

    }   

     

  } catch (error) { 

    return error; 

  } 

 

  //create masking policy if it doesn't exist 

  try { 

    execQuery(` 

      create masking policy if not exists SP_FULL_MASK_${COLUMNNAME} as (val string) returns string -> 

      case 

        when current_role() in ('${ROLENAME}') then '*********' 

        else val 

      end;` 

    ); 

    //apply the policy 

    execQuery(`alter table if exists ${DBNAME}.${SCHEMANAME}.${TABLENAME} modify column ${COLUMNNAME} set masking policy SP_FULL_MASK_${COLUMNNAME};`); 

     

    return `Successfly masked column ${COLUMNNAME} for role ${ROLENAME}`; 

  } catch (error) { 

    return error; 

  } 

  

  return `Successfly masked column ${COLUMNNAME} for role ${ROLENAME}`; 

$$;

Step 2 - Mask data!

Copy Text

‍

Want to make masking data in Snowflake even easier?

Do it in ALTR!

‍

Start masking data in Snowflake now

‍

Free Template for Masking Data in Snowflake

Watch the Webinar

Step 1 - Create masking policy stored procedure

Step 2 - Mask data!

Want to make masking data in Snowflake even easier?

Start masking data in Snowflake now

Related Resources

Snowflake Data Security: Top Strategies to Prevent Credential Compromise

Mandiant Threat Hunting Guide for Snowflake: ALTR Summary

ALTR Brief: Snowflake Compromised Customer Accounts

Snowflake Arctic & The Future of AI Governance

Automated Data Access Governance and Security

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Free Template for Masking Data in Snowflake

Step 1 - Create masking policy stored procedure

Step 2 - Mask data!

Want to make masking data in Snowflake even easier?

Start masking data in Snowflake now

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Providing real solutions

Free Template for Masking Data in Snowflake

Step 1 - Create masking policy stored procedure

Step 2 - Mask data!

Want to make masking data in Snowflake even easier?

Start masking data in Snowflake now

Free Template for Masking Data in Snowflake

Watch the Webinar

Step 1 - Create masking policy stored procedure

Step 2 - Mask data!

Want to make masking data in Snowflake even easier?

Start masking data in Snowflake now

Related Resources

Snowflake Data Security: Top Strategies to Prevent Credential Compromise

Mandiant Threat Hunting Guide for Snowflake: ALTR Summary

ALTR Brief: Snowflake Compromised Customer Accounts

Snowflake Arctic & The Future of AI Governance

Automated Data Access Governance and Security

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Pricing

Customers

Use Cases

Ecosystem

Resources

Company

industry

PLATFORM

use case

Free Template for Masking Data in Snowflake

Step 1 - Create masking policy stored procedure

Step 2 - Mask data!

Want to make masking data in Snowflake even easier?

Start masking data in Snowflake now

Heading 1

Heading 2

Heading 3

Heading 4

Heading 5

Heading 6

Providing real solutions

Free Template for Masking Data in Snowflake

Step 1 - Create masking policy stored procedure

Step 2 - Mask data!

Want to make masking data in Snowflake even easier?

Start masking data in Snowflake now