Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
  • H04L65/1066—Session management
  • H04L65/1083—In-session procedures
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L63/00—Network architectures or network communication protocols for network security
  • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
  • H04L63/0227—Filtering policies
  • H04L63/0245—Filtering by information in the payload
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
  • H04L65/80—Responding to QoS
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
  • H04L69/18—Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
  • H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
  • H04L9/3247—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving digital signatures

Definitions

• the present invention relates to a method and a system for monitoring a communication session on a data network, said session comprising a first data stream, called a parent stream, using a first protocol, said parent stream comprising data enabling establishing a second stream of data, said child stream, using a second protocol for said session. It also relates to a computer program product for implementing the monitoring method.
• a real-time protocol (RTP) session will be initiated by a Session Initiation Protocol (SIP) session. session initialization), and the parameters of the RTP session will depend on information exchanged by the SIP session.
• SIP Session Initiation Protocol
• Network monitoring devices such as, for example, firewalls, link the sessions of different protocols via state machines.
• a method of monitoring a communication session on a data network comprising a first stream of data, said parent stream, using a first protocol, the parent stream comprising data enabling the establishment of a second data stream, said child stream, using a second protocol for this session, comprises:
• this method advantageously makes it possible to easily group the related streams, and in particular without defining a state machine.
• the session comprising a determined plurality of child flows, the data flows are audited until the set of child flows is determined.
• the child stream including data for establishing a third data stream using a third protocol for the session, a signature is generated from these data, and data streams using the third protocol are audited to determining the data flow corresponding to the session.
• the method monitoring a plurality of sessions each comprising a parent stream for which a parent key is generated and stored, for each of the streams using the second protocol, the The signature is compared to each of the parent keys to determine whether the stream is, or not, the child stream of one of the sessions. It should be noted in particular that this method advantageously applies to a multitude of parent flows, child flows and any type of tree defining an inheritance between one or more parent flows, one or child flows with any level of information. 'legacies.
• a computer program product includes program code instructions recorded on a computer readable medium, for implementing the steps of the preceding method when said program is running on a computer.
• a system for monitoring a communication session on a data network comprising a first data stream, called a parent stream, using a first protocol, the parent stream comprising data enabling establishing a second stream of data, said child stream, using a second protocol for the session, comprises:
• a first stream analyzer for searching the parent stream for the data enabling the child stream to be established
• a second stream analyzer for auditing data streams using the second protocol on the data network
• a second signature generator for each of these streams
• the system comprises at least two devices connected by a data network, a first device comprising at least the storage memory, the signature comparator and the tagger and the second device comprising at least the first analyzer the first signature generator and an interface for transmitting the generated signature to the first device. It may also include at least a third device connected to the first device by the data network and comprising at least the second flow analyzer and the second signature generator and an interface for transmitting the generated signature to the first device.
• FIG. 1 is a schematic view of a data network
• FIG. 2 is a flow chart of a method according to one embodiment of the invention.
• FIG. 3 is a schematic view of a surveillance system according to one embodiment of the invention.
• FIG. 4 is a schematic view of a monitoring system according to a second embodiment of the invention.
• a digital data network 1 connects a multitude of devices 3 to each other.
• a monitoring system 5 is connected to this network to capture the data flows exchanged between the equipment 3.
• the system 5 thus monitors the communication sessions running on the network 1.
• the term "session”, or application session, is the set of data exchanges generated by a given network application.
• a first device when a first device wishes to transfer a file using a FTP protocol to a second device, the first device and the second device will start by establishing a first exchange using the TCP protocol on the port. 21 then they will agree to transfer the file itself using FTP-DATA which uses the TCP protocol on a variable number port greater than 1024. All of these exchanges constitute a session.
• sub-session or simply data stream
• the first sub-session will be called parent sub-session, or parent stream, in that it allows to exchange the data between the two equipments allowing the establishment of the second sub-session which will thus be called child sub-session, or child flow.
• the system 5 implements the following method, FIG.
• step 1 the system detects, step 1 1, establishment of an application session in the form of a parent stream.
• the system 5 analyzes, step 1 3, then the parent stream looking for establishment data of a child stream. For example, in the context of an FTP session, the system 5 will analyze the transmitted packets to determine the number of the port on which the file transfer will take place.
• step 1 5 a signature, called parent key, from these data.
• a signature for example, for an FTP session, the system 5 generates a signature from the I P addresses of the source equipment and the receiving equipment and the port number. This signature is, for example, a hash value of this data.
• This parent key is stored, step 1 7, by the system 5.
• the system 5 then monitors, step 1 9, the flows that can correspond to the child stream because implementing, for example, a protocol compatible with it.
• step 21 a signature.
• the calculation of this signature is similar to the calculation of the parent key. For example, for the FTP session, it calculates the hash key of the I P addresses of the two devices and the port number.
• This signature is compared, step 23, to the parent key.
• step 25 the desired child stream.
• the description above is limited to a parent stream and a child stream.
• the method is generalized without difficulty to a plurality of parent flows and child flows.
• a session consists of a parent stream and a plurality of child streams
• the system calculates as many parent keys as necessary and monitors all flows until all child flows are found.
• the comparison of the flow signatures is then made on all the parent keys until a parent key matches, thus defining the attachment session. If no key matches, it means that the stream does not belong to any monitored session.
• the method also applies smoothly to sessions with multiple cascading inheritances, i.e., a child stream has establishment data of another stream and behaves like a parent stream for that stream. other flow that is then its child flow. Based on the settlement data carried by the child stream, the system sets a parent key on which the signatures of the prospective child flows are compared.
• the set of parent keys may correspond to an ordered index vector, one of whose attributes is the session name.
• the search and comparison with the parent key (s) and the allocation of the flow to a session then correspond to an operation on indexes, a computer operation that is extremely efficient in terms of resources used and speed. It also makes it possible to pool the monitoring operations of a multitude of sessions.
• the monitoring system 5 thus comprises, FIG.
• a first signature generator 33 called the parent key, from these data
• a second stream analyzer 37 for auditing data streams using the second protocol on the data network;
• a second signature generator 39 for each of these streams;
• This monitoring system is feasible in the form of a dedicated electronic circuit or by specifically programming a computer with a computer program comprising program code instructions recorded on a computer-readable medium, to implement the steps of the program. monitoring process when the program is running on a computer.
• This computer comprises in particular a network interface enabling it to listen to the transmissions carried out on the network, volatile random access memories connected to a computing unit to generate the keys and signatures, storage memories that can be, for example, a magnetic hard disk to store especially the rules of formation of signatures.
• a particularly interesting embodiment of this system consists of breaking it up into several decentralized devices, FIG. 4.
• a first series of devices 50 installed closest to the streams comprises the flow analyzers 31, 37 and the signature generators 33, 39. Each then comprises a communication interface 52 with a centralization device 54 comprising, in addition to a communication interface 56 in connection with the interfaces 52, the storage memory 35 of the signatures as well as the comparator 41 of the signature and the tagger 43.
• the latter element can also be found in the first devices 50 in order to label the flows as close to their production.
• the monitoring system may actually include only one flow analyzer and one signature generator capable of auditing feeds and generating signatures for parent feeds as well. only for child flows. Or, for reasons of speed, these can be as numerous as there are types of protocols.

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Multimedia (AREA)
• Computer Security & Cryptography (AREA)
• Computer Hardware Design (AREA)
• Computing Systems (AREA)
• General Engineering & Computer Science (AREA)
• Business, Economics & Management (AREA)
• General Business, Economics & Management (AREA)
• Data Exchanges In Wide-Area Networks (AREA)
• Computer And Data Communications (AREA)

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Citations (4)

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• 2009
  • 2009-09-09 FR FR0956161A patent/FR2949934B1/fr active Active
• 2010
  • 2010-09-01 SG SG2012016234A patent/SG179043A1/en unknown
  • 2010-09-01 WO PCT/FR2010/051823 patent/WO2011030045A1/fr active Application Filing
  • 2010-09-01 EP EP10763796A patent/EP2476237A1/de not_active Withdrawn
  • 2010-09-01 CA CA2773247A patent/CA2773247A1/fr not_active Abandoned
  • 2010-09-01 JP JP2012528417A patent/JP5696147B2/ja active Active
  • 2010-09-01 US US13/394,444 patent/US20120166666A1/en not_active Abandoned
  • 2010-09-01 KR KR1020127008474A patent/KR101703805B1/ko active IP Right Grant
  • 2010-09-01 CN CN201080051601.5A patent/CN102714652B/zh active Active

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