I have a usecase where I need to enable internal users to login to Salesforce using a branded login page. We have built this login page(html) in our website using Angular.js with its own custom branding. Now the requirement is users needs to use this login page and entering their Salesforce username and password , they should be able to login to Salesforce home page.
My understanding is that we can use frontdoor.jsp and pass SESSION ID as an input parameter to achieve this requirement. So I have got the session Id through OAUTH flow( using postman) and copy pasted the session id in the URL. however it's not working and redirected to Salesforce login page .
Is there anyone done similar implementation before ? Is there any alternative way to achieve the results (without using SSO).?