Use Azure Storage Queue and Azure Storage Blob to store Sitecore 9.3+ Forms uploads Encrypted, with a key from Azure Key Fault. See http://www.stockpick.nl/english/sitecore-93-forms-process-sensitive-files/
What you can do is process the message on the queue with for example an Azure function, get the related uploaded files, process the message and files. And delete the sensitive files and remove the message from the queue. The message on the queue is now not encrypted. If the information is very sensitive, you can also encrypt that.
For Storing (temporary) the uploaded files and tempory storing the form values
- Goto Access keys
- Copy the Connection string use it for Stockpick.Forms.AzureQueue.Connectionstring ideally you set this also I key vault for now just as easy to quickly have a local dev environment.
No necessary to create queue or blob storage the code will create one on the first use.
You use this to authenticate instead of a user.
- Goto App-registraties
- Create a new app,
- Create a new application secret
- Copy you secret value this value do you need for the setting Stockpick.Forms.KeyFault.ClientSecret
- Goto overview of the app, and copy the Applicaton (client-id) Use it for the setting Stockpick.Forms.KeyFault.ClientId
SEE https://docs.microsoft.com/en-us/azure/active-directory/develop/howto-create-service-principal-portal for more info about creating an Service principal,
##Create a Key vault For storing the secret decryption key
- Create a Key with name sitecoreformupload, RSA is fine.
- Goto Access policies of your Key vault, and add your app give Key Permissions GET and unwrapKey
- Compile
- Deploy
- Unicorn sync
- Config \App_Config\Include\Stockpick.Form.Cloud.config
- Create a Form
- Add the new save action to your Form
It also contains a Decrypt controller, but that is more for the purpose to demo how to encrypt a file, Note in this example all files are encrypted with the same key. So still possible to easy get all uploaded files if you have the key. I expect you to delete the uploaded files after you have processed them, so that they are only there for a while. Example url https://sc93sc.dev.local/api/decryptblobfile/File/963ac1b1-4744-4c42-9a00-76771d8f82c2
note: Sitecore Forms automatically stores uploaded files when a visitor navigates between form pages. So the uploads are still unencrypted in the ExperienceForms database, you need to create also a custom FileStorageProvider class currently not included in this project.
So actually this first attempt is not optimal, to be continued