PCF external services API Key/Secrets security

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Posted on by JasonAlmeida

Hi All,

*apologies if this has been discussed already*

We've seen a few PCF controls that utilise extrernal services and APIs. Skimming through some of these controls it seems like the apporach tends to be via a config parameter that takes a key/secret/url or embedded in the .ts file directly.

This is obviously a concern from a security point of view as the key could be easily accessed via developer tools or the custom control configuration. My questions:

Is there a better approach to defining and storing keys/secrets for PCFs?
Could we maybe have a secure property type that can handle this? (totally open to other suggestions btw)

Some other ideas that went through my head:

config entity that is queried - but this tightly couples a control to an entity
storing in keyvault - but this is subject to the same secret config issue and may have a performance impact

cheers

Jason

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Power Apps Pro Dev & ISV

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v-xida-msft on at

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Hi @JasonAlmeida ,

Do you want to encrypt the services API Key/Secrets security within your .ts config file?

I afraid that there is no direc way to achieve your needs currently in PowerApps. As an alternative solution, you could consider add a RSA Encrypt function in your .ts config file to encrypt your services API Key/Secrets security. Then when you send request to your external service, encrypt the services API Key/Secrets security as query parameter within the request.

Within your external service, you need also use same RSA Decrypt method to decrypt the encrypted services API Key/Secrets security. Please check and see if the following article would help in your scenario:

https://stackoverflow.com/questions/46642143/rsa-encrypt-decrypt-in-typescript

If you would like to get further help in this issue, please consider submit an assisted support ticket through the following link:

https://powerapps.microsoft.com/en-us/support/pro

Best regards,

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Hemant Gaur on at

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@JasonAlmeida wrote:

Hi All,

*apologies if this has been discussed already*

We've seen a few PCF controls that utilise extrernal services and APIs. Skimming through some of these controls it seems like the apporach tends to be via a config parameter that takes a key/secret/url or embedded in the .ts file directly.

This is obviously a concern from a security point of view as the key could be easily accessed via developer tools or the custom control configuration. My questions:

Is there a better approach to defining and storing keys/secrets for PCFs?

Could we maybe have a secure property type that can handle this? (totally open to other suggestions btw)

Some other ideas that went through my head:

config entity that is queried - but this tightly couples a control to an entity

storing in keyvault - but this is subject to the same secret config issue and may have a performance impact

cheers

Jason

PCF is the client side framework and hence any requests made from the client will have the keys exposed to the end user via browser. Low impact keys which can be shared with the users (as they are autheticated PowerApps users) can be added via PCF properties which customizers add. For the ones which need to be shielded from end users you can use server side plugins or connectors on the canvas apps to manage the connection and make the request. KeyValut can also be used on the server side if there is requirement to not store creds on the server. Configuration entity is another option for low impact keys. For performance the shortlived access tokens can be cached in the using setControlStateAPI.

PCF controls do not offer authentication/SSO yet and we plan to add limited AAD auth support for embedded iFrames in next semester.

thanks,

Hemant

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MJain 2,450 on at

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The better idea would be to use Actions and call them from your PCF control normally the way you call them from JS.

Please refer to my control : https://github.com/mkcgphy/Azure-Maps-Get-Search-Address-TypeAhead as reference.

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AllanDeCastro 412 Most Valuable Professional on at

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For me, there is no real best solution as we can retrieve the key in any case via fiddler or debug it.
However, you can either insert the key into a CDS environment variable (https://docs.microsoft.com/en-us/power-platform-release-plan/2019wave2/microsoft-powerapps/new-solution-components-get-full-support) or insert the key in an input properties.

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Diana Birkelbach 3,072 Most Valuable Professional on at

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The EnvironmentVariables are not supposed be used for secrets, as in the current limitation is stated:
"Not a secure store for secrets, such as passwords"

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MJain 2,450 on at

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The Environment Variable Definition and Environment Value both are entities which are recently added and this can be used to store configuration data. Agreed passwords should not be stored .

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AllanDeCastro 412 Most Valuable Professional on at

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Yes, I know all about it very well.

But in this case, what is your solution? 🙂

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MJain 2,450 on at

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What we did was to create an action and call it from JS. This way no where from client side the key is exposed. We used key from configuration part of plugin registration which gave us flexibility for changing depending upon environment.
Thanks

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AllanDeCastro 412 Most Valuable Professional on at

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Yes, I understand that it's more secure because it's on the server side. However, it will be more difficult for you to change this key if it is hard-coded.
I'm not sure I understand what you're doing with your action? You query the external web service and send the answer back?
Indeed, it seems to me that it is better, but we are losing the flexibility we have to change the key.

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Diana Birkelbach 3,072 Most Valuable Professional on at

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You don't have to hard code the key. You could use the PlugIn "Secure Configuration" to store the key.

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