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Name of API: Web SMS API
References: https://bugzilla.mozilla.org/show_bug.cgi?id=674725

Brief purpose of API: Send and recieve SMS messages
General Use Cases: None

Inherent threats: 
* Sending an SMS costs user money, premium SMS services, SMS payments etc
* Receiving SMS has privacy implications, SMS also used for 2-factor 
authentication

Threat severity: critical per https://wiki.mozilla.org/Security_Severity_Ratings

== Regular web content (unauthenticated) ==
Use cases for unauthenticated code: App prompts user to send SMS
Authorization model for uninstalled web content: Explicit (OS Mediated)
Authorization model for installed web content: Explicit (OS Mediated)
Potential mitigations: Prompt user to send SMS. User reviews SMS in trusted UI 
prior to sending.

== Trusted (authenticated by publisher) ==
Use cases for authenticated code: As per regular web content?
Authorization model: Explicit (OS Mediated)
Potential mitigations: Same as above

== Certified (vouched for by trusted 3rd party) ==
Use cases for certified code: Replacement SMS app
Authorization model: implicit
Potential mitigations: None beyond certification

Notes: Can only certified apps have access to read SMS messages? 

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