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![OAuth
2.0
:
Client
Creden,als
curl
-‐v
-‐X
POST
-‐-‐basic
-‐u
588997174524690:d5cc4d8e01c9bd7ac14b4d5e91006b5b
]
-‐H
"Content-‐Type:
applica,on/x-‐www-‐form-‐urlencoded;charset=UTF-‐8”
-‐d
"client_id=588997174524690&grant_type=client_creden,als"
hPps://graph.facebook.com/oauth/access_token](https://image.slidesharecdn.com/securingyourapis-patternsandmore-151215173336/75/WSO2Con-USA-2015-Securing-your-APIs-Patterns-and-More-8-2048.jpg)
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WSO2Con USA 2015: Securing your APIs: Patterns and More
The document discusses various API authentication mechanisms including HTTP basic, digest, TLS mutual authentication, and OAuth versions 1.0 and 2.0. It covers implementation details and examples while also highlighting fine-grained access control strategies such as XACML architecture and User Managed Access (UMA). Additionally, it mentions token introspection and the use of chained APIs for centralized authorization in distributed systems.
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WSO2Con USA 2015: Securing your APIs: Patterns and More
- 1. API Security Pa.erns and More Prabath Siriwardena Director of Security Architecture WSO2
- 2. Direct Authen,ca,on • HTTP Basic Authentication • HTTP Digest Authentication • TLS Mutual Authentication • OAuth 1.o : Two Legged OAuth • OAuth 2.o : Client Credentials • NTLM / Kerberos
- 3. HTTP Basic Authen,ca,on curl -‐I -‐u $GitHubUserName:GitHubPassword -‐X POST -‐H 'Content-‐Type: applica,on/x-‐www-‐form-‐urlencoded’ -‐d '{"name": "my_github_repo"}' hPps://api.github.com/user/repos § Creating a GitHub repository
- 4. HTTP Digest Authen,ca,on curl -‐k –-‐digest –u userName:password -‐v hPps://localhost:8443/recipe HTTP/1.1 401 Unauthorized WWW-‐Authen,cate: Digest realm="cute-‐cupcakes.com", qop="auth”, nonce="1390781967182:c2db4ebb26207f6ed38bb08eeffc7422", opaque="F5288F4526B8EAFFC4AC79F04CA8A6ED" Authoriza,on: Digest username="prabath", realm="cute-‐cupcakes.com", nonce="1390781967182:c2db4ebb26207f6ed38bb08eeffc7422", uri="/recipe", cnonce="MTM5MDc4", nc=00000001, qop="auth", response="f5bi64ba8596d1b9ad1514702f5a062", opaque="F5288F4526B8EAFFC4AC79F04CA8A6ED"
- 5. HTTP Basic vs. Digest Authen,ca,on
- 6. TLS Mutual Authen,ca,on curl -‐k -‐-‐cert client.pem hPps://localhost:8443/recipe
- 7. OAuth 1.0 : Two Legged OAuth POST /student?name=pavithra HTTP/1.1 Host: server.com Content-‐Type: applica,on/x-‐www-‐form-‐urlencoded Authoriza,on: OAuth realm="simple", oauth_consumer_key="dsdsddDdsdsds ", oauth_token=" ", oauth_signature_method="HMAC-‐SHA1", oauth_,mestamp="1474343201", oauth_nonce="rerwerweJHKjhkdsjhkhj", oauth_signature="bYT5CMsGcbgUdFHObYMEfcx6bsw%3D"
- 8. OAuth 2.0 : Client Creden,als curl -‐v -‐X POST -‐-‐basic -‐u 588997174524690:d5cc4d8e01c9bd7ac14b4d5e91006b5b ] -‐H "Content-‐Type: applica,on/x-‐www-‐form-‐urlencoded;charset=UTF-‐8” -‐d "client_id=588997174524690&grant_type=client_creden,als" hPps://graph.facebook.com/oauth/access_token
- 9. Kerberos / NTLM § Can be implemented as OAuth 2.0 grant types
- 10. Brokered Authen,ca,on § SAML 2.0 grant type for OAuth 2.0
- 11. Brokered Authen,ca,on § SAML 2.0 grant type for OAuth 2.0
- 12. Brokered Authen,ca,on § JWT grant type for OAuth 2.0
- 13.
- 14. Fine-‐grained Access Control POST /introspec,on HTTP/1.1 Accept: applica,on/x-‐www-‐form-‐urlencoded Host: server.example.com Authoriza,on: Basic czZCaGRSa3F0Mzo3RmpmcDBaQnIxS3REUmJuZlZkbUl3 token=X3241Affw.4233-‐99JXJ&resource_id=… { "ac,ve": true, "client_id":"s6BhdRkqt3", "scope": "read write dolphin", "sub": "2309x32kl", "aud": hPp://example.org/protected-‐resource/* } § Token Introspection
- 15. Fine-‐grained Access Control § XACML Architecture
- 16. Fine-‐grained Access Control § XACML Request <Request> <A.ributes Category="urn:oasis:names:tc:xacml:3.0:a.ribute-‐category:oauth-‐client"> <A.ribute A.ributeId="urn:oasis:names:tc:xacml:1.0:client:client-‐id"> <A.ributeValue DataType="h.p://www.w3.org/2001/XMLSchema#string">32324343434</A.ributeValue> </A.ribute> <A.ributes> <A.ributes Category="urn:oasis:names:tc:xacml:3.0:aPribute-‐category:ac,on"> <A.ribute A.ributeId="urn:oasis:names:tc:xacml:1.0:acUon:acUon-‐id"> <A.ributeValue DataType="h.p://www.w3.org/2001/XMLSchema#string">GET</A.ributeValue> </A.ribute> </A.ributes> <A.ributes Category="urn:oasis:names:tc:xacml:3.0:aPribute-‐category:scope"> <A.ribute A.ributeId="urn:oasis:names:tc:xacml:1.0:scope:scope-‐id"> <A.ributeValue DataType="h.p://www.w3.org/2001/XMLSchema#string">user_acUviUes</A.ributeValue> </A.ribute> </A.ributes> <A.ributes Category="urn:oasis:names:tc:xacml:3.0:a.ribute-‐category:resource"> <A.ribute A.ributeId="urn:oasis:names:tc:xacml:1.0:resource:resource-‐id"> <A.ributeValue DataType="h.p://www.w3.org/2001/XMLSchema#string"> h.ps://graph.facebook.com/prabathsiriwardena/acUviUes</A.ributeValue> </A.ribute> </A.ributes> </Request>
- 17. Fine-‐grained Access Control § XACML Policy <Policy> <Target> <AnyOf> <AllOf> <Match MatchId="urn:oasis:names:tc:xacml:1.0:funcUon:string-‐equal"> <A.ributeValue DataType="h.p://www.w3.org/2001/XMLSchema#string"> user_ac,vi,es</A.ributeValue> <A.ributeDesignator MustBePresent="false" Category="urn:oasis:names:tc:xacml:3.0:a.ribute-‐category:scope" A.ributeId="urn:oasis:names:tc:xacml:1.0:scope:scope-‐id" DataType="h.p://www.w3.org/2001/XMLSchema#string"></A.ributeDesignator> </Match> </AllOf> </AnyOf> </Target> <Rule RuleId="permit_rule" Effect="Permit"> </Rule> <Rule RuleId="deny_rule" Effect="Deny"> </Rule> </Policy>
- 18.
- 19. Chained APIs POST /token HTTP/1.1 Host: authz.server.net Content-‐Type: applica,on/x-‐www-‐form-‐urlencoded grant_type= hPp://oauth.net/grant_type/chain oauth_token=dsddDLJkuiiuieqjhk238khjh scope=read HTTP/1.1 200 OK Content-‐Type: applica,on/json;charset=UTF-‐8 Cache-‐Control: no-‐store Pragma: no-‐cache { "access_token":"2YotnFZFEjr1zCsicMWpAA", "token_type":"Bearer", "expires_in":1800, }
- 20. Centralized Authoriza,on with Distributed Resource Servers
- 21. User Managed Access (UMA) • PAT (Protection API Token) : Token issued to the Resource Server to access the Protection API (Authorization Server) with the approval of the Resource Owner. • AAT (Authorization API Token) : Token issued to the Client to access the Authorization API (Authorization Server).. • RPT (Requesting Party Token) : Token issued to the Client to access the Protected Resource on behalf of the Requesting Party by the Authorization Server.
- 22.