sharepoint API access from internet

Hi,

I have sharepoint server which i can access for sites and Sharepoint API through custom C# application when i am connected via VPN to the network.

I want to know if I can access sharepoint API through internet even when i am not connected to the network via VPN. I need to build custom application which can access and add data to our sharepoint site/lists.
ziorinfoAsked:
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Jamie McAllister MVPSharePoint ConsultantCommented:
What version of SharePoint are we talking about?

OAuth is likely the best way forward for you;

http://msdn.microsoft.com/en-us/library/office/fp142382(v=office.15).aspx
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ziorinfoAuthor Commented:
We are using SP 2010
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Jamie McAllister MVPSharePoint ConsultantCommented:
OK, that limits things a little.

You won't get direct access to the API anyway, however you can access and add data via the external interfaces - web services and Client Object Model.

There's an example of using Forms Based Auth for web services  here; http://www.tonytestasworld.com/post/2009/06/04/How-To-Authenticate-and-Use-SharePoint-Web-Services-in-an-FBA-SharePoint-site.aspx

There are many examples of passing credentials to web service calls;

http://blogs.msdn.com/b/tejasr/archive/2009/09/25/ways-to-pass-security-credentials-to-web-service-call.aspx

http://sharepoint.stackexchange.com/questions/44361/how-can-i-pass-credentials-to-sharepoint-2010-people-service

http://blogs.msdn.com/b/chjain/archive/2013/11/29/sharepoint-online-pass-credentials-to-web-service-passively.aspx
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ziorinfoAuthor Commented:
Thanks Jamie for the links, I will go through them...

Please excuse me if my questions are too obvious or stupid :-) I don't know SP that well yet....

I want to confirm one thing...if my SharePoint server is internal, first I need to have it accessible with the static ip over internet for outside world.

Do I need to change anything in SharePoint settings or IIS so that SharePoint services are accessible as well, or using client Object model will have access to the API by default.

I mean do i need to do anything with firewall, or network settings...?
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Jamie McAllister MVPSharePoint ConsultantCommented:
You have to be really careful with this. I would not expose my SharePoint farm to the open internet in any way. (Or any other business application or data frankly)

To do this I'd want VPN access by authenticated business users.

Who are the users of the application you want to write? How do they currently authenticate to SP?
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ziorinfoAuthor Commented:
Thanks for your input...its really helpful...
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