IPSec implementation for SCTP
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1 SCTP and Proposed Modifications to Aditya Kelkar Alok Sontakke Srivatsa R. Dept. of CSE. IIT Bombay October 31, 2004
2 SCTP and Proposed Modifications to SCTP and 4 Proposed Modifications to 5
3 SCTP and Proposed Modifications to Features and Comparison of SCTP[4] with TCP Connection Oriented, Unicast Protocol
4 SCTP and Proposed Modifications to Features and Comparison of SCTP[4] with TCP Connection Oriented, Unicast Protocol SCTP is Message Oriented
5 SCTP and Proposed Modifications to Features and Comparison of SCTP[4] with TCP Connection Oriented, Unicast Protocol SCTP is Message Oriented SCTP Multi-Streaming Feature
6 SCTP and Proposed Modifications to Features and Comparison of SCTP[4] with TCP Connection Oriented, Unicast Protocol SCTP is Message Oriented SCTP Multi-Streaming Feature SCTP Multi-Homing Feature
7 SCTP and Proposed Modifications to SCTP Message Format Header Source and destination port numbers 32-bit verification tag 32-bit checksum
8 SCTP and Proposed Modifications to SCTP Message Format Header Source and destination port numbers 32-bit verification tag 32-bit checksum Data/Control Chunk Chunk type Flag field Length Value
9 SCTP and Proposed Modifications to Benefits of SCTP Acknowledged reliable non-duplicated transfer of user data Application-level segmentation to conform to the maximum transmission unit (MTU) size Sequenced delivery of user datagrams within multiple streams Optional multiplexing of user datagrams into SCTP datagrams Enhanced reliability through support of multihoming at either or both ends of the association Congestion avoidance and resistance to flooding and masquerade attacks
10 SCTP and Proposed Modifications to Applications of SCTP Telephony Signaling - Loosely correlated messages (different calls) can be delivered without having to maintain overall sequence integrity.
11 SCTP and Proposed Modifications to Applications of SCTP Telephony Signaling - Loosely correlated messages (different calls) can be delivered without having to maintain overall sequence integrity. Transfer of Multimedia documents - SCTP allows transport of these components to be partially ordered rather than strictly ordered, and may result in improved user perception of transport.
12 SCTP and Proposed Modifications to [2] is a security mechanism in the TCP/IP protocol suite. operates between layers 2/3. Security services can be applied to layers 3-7. Provides following security services Confidentiality - Sender can encrypt packets, decrypted by only designated receiver. Integrity - Packets are not altered in transit. Data origin authentication - Receiver can authenticate the sender. Anti replay service - Receiver can detect replayed packets and reject them. Key management - Secure exchange of keys.
13 SCTP and Proposed Modifications to Architecture architecture includes standards for Encapsulating Security Payload (ESP). Authentication Header (AH). These two protocols operate in two modes. Tunnel mode - Applied to the whole packet. Transport mode - Applied to payload and selected portions of IP header.
14 SCTP and Proposed Modifications to Authentication Header Authentication Header contains the checksum of fields with a pre-shared key. Reciever verifies the integrity by recomputing the checksum and comparing it with the checksum in the packet.
15 SCTP and Proposed Modifications to Encapsulating Security Payload Sender encrypts the packet/payload with a pre-shared key. Only receiver can decrypt the packet and recover the plaintext.
16 SCTP and Proposed Modifications to Security Policies (SPs) Specifies security serivces and how they are to be applied to IP traffic. Policies are selected by matching selectors. Source/Destination IP address. Source/Destination ports. Transport layer protocol. User ID. Data sensitivity level. Bypass, Apply, Drop? Process by applying bundles of transformation.
17 SCTP and Proposed Modifications to Security Association (SA) One-way connection between communicating parties. Parameterized by Destination Address, protocol and a unique 32-bit integer - SPI. Established when parties start communicating. Each bi-directional connection must create atleast two SAs. Security Association Database (SAD) stores all the parameters associated with an SA. Sequence Number. Sequence counter overflow. Anti reply window. Authentication Algorithm and Keys (for AH). Encryption Algorithm and keys (for ESP). Authentication Algorithm and keys for ESP. Lifetime of the SA.
18 SCTP and Proposed Modifications to Combining security associations Security associations can be combined into bundles in two ways. Transport adjecency.
19 SCTP and Proposed Modifications to Combining security associations Iterated tunneling
20 SCTP and Proposed Modifications to Application - Secure Branch office connectivity can be used for secure connection between main office and branch office.
21 SCTP and Proposed Modifications to SCTP over [1] Why current implementation needs to be modified? Using SCTP endpoints in selectors - source and destination port numbers
22 SCTP and Proposed Modifications to SCTP over [1] Why current implementation needs to be modified? Using SCTP endpoints in selectors - source and destination port numbers Single SA should specify all source-destination address pairs
23 SCTP and Proposed Modifications to SCTP over [1] Why current implementation needs to be modified? Using SCTP endpoints in selectors - source and destination port numbers Single SA should specify all source-destination address pairs SPD entries should specify multiple source-destination IP addresses
24 SCTP and Proposed Modifications to SCTP over [1] Why current implementation needs to be modified? Using SCTP endpoints in selectors - source and destination port numbers Single SA should specify all source-destination address pairs SPD entries should specify multiple source-destination IP addresses IKE
25 SCTP and Proposed Modifications to SCTP over [1] Why current implementation needs to be modified? Using SCTP endpoints in selectors - source and destination port numbers Single SA should specify all source-destination address pairs SPD entries should specify multiple source-destination IP addresses IKE Address updates of SCTP sessions must be authenticated
26 SCTP and Proposed Modifications to Data structures for SAD and SPD Security Policy
27 SCTP and Proposed Modifications to Data structures for SAD and SPD Security Policy Security Association
28 SCTP and Proposed Modifications to Current organization of these structures
29 SCTP and Proposed Modifications to Packet Processing Input IP packet to be sent Refers to SPD for type of processing Follows SA bundle to apply series of transformations. Each transformation adds an IPsec header.
30 SCTP and Proposed Modifications to Packet Processing Input IP packet to be sent Refers to SPD for type of processing Follows SA bundle to apply series of transformations. Each transformation adds an IPsec header. Output Find the SA in SAD Apply reverse transformation Continue till Transport/IP header is encountered Check from SPD that all reverse transformations have been applied.
31 SCTP and Proposed Modifications to Proposed Changes What? Incorporate multiple source/destination addresses into data structures.
32 SCTP and Proposed Modifications to Proposed Changes What? Incorporate multiple source/destination addresses into data structures. Where? One SA and SP for each address pair. Modify the address structure itself to include multiple addresses. Modify SA and SP.
33 SCTP and Proposed Modifications to Proposed Changes What? Incorporate multiple source/destination addresses into data structures. Where? One SA and SP for each address pair. Modify the address structure itself to include multiple addresses. Modify SA and SP. Why? Changing address structure causes unwanted changes since is used not just in SAD and SPD. Multiple SA s consumes more memory, affects search time, negotiation time.
34 SCTP and Proposed Modifications to How proposed changes will affect the management of the data structures Functions creating the structures. Inserting SA s into hash queues requires multiple insertions in required hash queues. Matching selectors should incorporate multiple addresses.
35 SCTP and Proposed Modifications to Conclusion How to extend support for SCTP. Methods by which multiple addresses can be negotiated in have been proposed. Comparison of these methods.
36 SCTP and Proposed Modifications to Future Work Extraction of SCTP port numbers to use in selectors for SPD. Extend key negotiation in IKE[3] to negotiate single SA for multiple addresses.
37 SCTP and Proposed Modifications to References beamericonarticle S. Bellovin et. al. Rfc-3554: On the use of stream control transmission protocol (sctp) with ipsec, beamericonarticle S. Kent et. al. Rfc-2401: Security architecture for the internet protocol, beamericonarticle D. Harkins. Rfc-2409: The internet key exchange (ike), beamericonarticle R. Stewart. Rfc-2960: Stream control transmission protocol, 2000.
38 SCTP and Proposed Modifications to Thank you!!! Thank you!!!
39 SCTP and Proposed Modifications to Table with 5 colours and multicolumn Course Date Time Algorithms 23/11/2004 2:30 FSVP 14/11/ :30 Artificial Intelligence 19/11/2004 2:30 Seminar Hooray! no endsem!! Communication Skills Hooray! endsem over!!
40 SCTP and Proposed Modifications to Graph with gnuplot Equation: e sin( (x+y))
41 SCTP and Proposed Modifications to Simple picture using PGF
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