| (11) | EP 3 346 663 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
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| (54) | APPARATUS, SYSTEM, AND METHOD FOR ACCELERATING SECURITY INSPECTIONS USING INLINE PATTERN MATCHING VORRICHTUNG, SYSTEM UND VERFAHREN ZUR BESCHLEUNIGUNG VON SICHERHEITSINSPEKTIONEN MIT INLINE-MUSTERABGLEICH APPAREIL, SYSTÈME ET PROCÉDÉ POUR ACCÉLÉRER DES CONTRÔLES DE SÉCURITÉ AU MOYEN D'APPARIEMENT DE MOTIFS EN LIGNE |
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| Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
BACKGROUND
[0001] Security inspections performed on network communications often consume a significant amount of resources. For example, a firewall may perform security inspections on packets entering a network. As part of such inspections, the firewall may first parse the packets and then attempt to match certain information parsed from the packets with signatures included in an Intrusion Prevention System (IPS) database. In this example, the firewall may perform the parsing and the matching with a Central Processing Unit (CPU) and/or a Graphics Processing Unit (GPU). In the event that information parsed from one of the packets matches a signature that represents a known attack pattern, the firewall may classify the packet as malicious and then take some sort of remedial action.
[0002] Unfortunately, since traditional IPS parsing and matching operations are performed by the CPU and/or GPU, these operations may slow down the CPU and/or GPU relative to the packet Input/Output (I/O) rate and/or line rate, thereby impairing the firewall's performance. Moreover, since traditional IPS security inspections call for packets to be parsed before being matched, the firewall may end up parsing packets that ultimately result in no match, thereby decreasing the efficiency of the IPS security inspections.
[0003] US 2008/0201772 describes a method of determining whether a data stream includes unauthorized data, the data stream is analyzed using a hardware filter to detect a presence of one or more of a first set of patterns in the data stream. It is determined whether a packet in the data stream belongs to one of a plurality of data flows to be further inspected based on the analysis of the data stream by the hardware filter. A set of rules is applied to the packet to produce rule match status data if it is determined that the packet belongs to one of the plurality of data flows to be further inspected. The packet is analyzed to determine if the packet includes unauthorized data using software stored on a computer-readable medium and implemented on a processor if the rule match status data indicates that the packet potentially includes unauthorized data.
[0004] US 2014/223564 A1 describes a pattern matching system for a network security device including a pattern matching card configured to generate a pattern matching result by matching data of a received packet with a pre-stored pattern of a signature pattern table, and an analyzing engine configured to copy the packet and transfer the copied packet to the pattern matching card and configured to detect a bad traffic based on packet analysis information of the packet and the pattern matching result received from the pattern matching card.
SUMMARY
[0005] The present teachings therefore are directed at least in part to systems and methods for accelerating security inspections using inline pattern matching.
[0006] Particular aspects and embodiments are set out in the appended independent and dependent claims.
[0007] As will be described in greater detail below, the instant disclosure generally relates to apparatuses, systems, and methods for accelerating security inspections using inline pattern matching. In one example, an apparatus for accomplishing such a task may include (1) at least one storage device that stores a set of signatures that facilitate pattern matching in connection with network traffic, (2) at least one physical processing device communicatively coupled to the storage device, and (3) at least one hardware accelerator communicatively coupled to the physical processing device, wherein the hardware accelerator is configured to: receive a packet that is destined for a computing device within a network, wherein the packet is unparsed upon receipt by the hardware accelerator; perform pattern matching on the packet by: comparing at least a portion of the packet with the set of signatures stored in the storage device; and determining, based at least in part on the comparison, that the portion of the packet matches at least one of the signatures; identify an offset that corresponds to a location of the portion of the packet that matches the signature; identify an index that specifies, relative to the storage device, the signature to which the portion of the packet matches; insert the offset and the index in a footer of the packet prior to forwarding the packet to the physical processing device; and forward the packet including the footer to the physical processing device, wherein the physical processing device (A) receives the packet from the hardware accelerator after completion of the pattern matching by the hardware accelerator (B) obtains the offset and index from the footer of the packet, and (C) parses, in response to the hardware accelerator determining that the portion of the packet matches at least one of the signatures, at least the portion of the packet to determine whether the packet is malicious based at least in part on the offset and the index of portion of the packet by extracting content from the location in the packet identified by the offset, and comparing the content extracted from the portion of the packet at the offset with the at least one of the signatures specified by the index, and then (D) upon determining that the packet is malicious, performing at least one security action in connection with the packet.
[0008] A corresponding method may include (1) receiving, by a hardware accelerator, a packet that is destined for a computing device within a network, wherein the packet is unparsed upon receipt by the hardware accelerator, (2) performing, by the hardware accelerator, pattern matching on the packet by (A) comparing at least a portion of the packet with a set of signatures that facilitate pattern matching in connection with network traffic, the signatures being stored within a storage device, and (B) determining, based at least in part on the comparison, that the portion of the packet matches at least one of the signatures, (3) identifying, by the hardware accelerator, an offset that corresponds to a location of the portion of the packet that matches the signature, (4) identifying, by the hardware accelerator, an index that specifies, relative to the storage device, the signature to which the portion of the packet matches, (5) inserting, by the hardware accelerator, the offset and the index in a footer of the packet prior to forwarding the packet to the physical processing device, (6) forwarding, by the hardware accelerator, the packet including the footer to a physical processing device that is communicatively coupled to the hardware accelerator, (7) receiving, by the physical processing device, the packet from the hardware accelerator after completion of the pattern matching by the hardware accelerator, (8) obtaining, by the physical processing device, the offset and index from the footer of the packet, (9) parsing, in response to the hardware accelerator determining that the portion of the packet matches at least one of the signatures, by the physical processing device, at least the portion of the packet to determine whether the packet is malicious based at least in part on the offset and the index of the portion of the packet by extracting content from the location in the packet identified by the offset, and comparing the content extracted from the portion of the packet at the offset with the at least one of the signature specified by the index, and then (10) upon determining that the packet is malicious, performing at least one security action in connection with the packet.
[0009] Features from any of the above-mentioned embodiments may be used in combination with one another in accordance with the general principles described herein. These and other embodiments, features, and advantages will be more fully understood upon reading the following detailed description in conjunction with the accompanying drawings and claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The accompanying drawings illustrate a number of example embodiments and are a part of the specification. Together with the following description, these drawings demonstrate and explain various principles of the instant disclosure.
FIG. 1 is a block diagram of an example apparatus for accelerating security inspections using inline pattern matching.
FIG. 2 is a block diagram of an example implementation of an apparatus for accelerating security inspections using inline pattern matching.
FIG. 3 is an illustration of an example HyperText Transfer Protocol (HTTP) request.
FIG. 4 is an illustration of an example set of signatures that facilitate pattern matching in connection with network traffic.
FIG. 5 is a flow diagram of an example method for accelerating security inspections using inline pattern matching.
FIG. 6 is a block diagram of an example computing system capable of implementing and/or being used in connection with one or more of the embodiments described and/or illustrated herein.
[0011] Throughout the drawings, identical reference characters and descriptions indicate similar, but not necessarily identical, elements. While the example embodiments described herein are susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and will be described in detail herein. However, the example embodiments described herein are not intended to be limited to the particular forms disclosed. Rather, the instant disclosure covers all modifications, equivalents, and alternatives falling within the scope of the appended claims.
DETAILED DESCRIPTION
[0012] The present disclosure describes various apparatuses, systems, and methods for accelerating security inspections using inline pattern matching. As will be explained in greater detail below, embodiments of the instant disclosure may perform pattern matching on packets before parsing the same. As a result, these embodiments may increase the efficiency of security inspections (such as deep packet inspections) by parsing only those packets whose contents resulted in a pattern match. In other words, these embodiments may enable network devices to achieve selective and/or intelligent parsing during security inspections.
[0013] Additionally or alternatively, embodiments of the instant disclosure may offload the pattern matching operations to hardware engines (such as a line card and/or an Application Specific Integrated Circuit (ASIC)). In doing so, these embodiments may free up and/or make available CPU and/or GPU resources that would have otherwise been consumed by the pattern matching operations. As a result, these embodiments may enable hardware engines to perform pattern matching on incoming packets and then forward only those packets whose contents resulted in a pattern match to the CPU and/or GPU for parsing, thereby eliminating a significant amount of processing overhead and speeding up security inspections as a whole.
[0014] The following will provide, with reference to FIGS. 1 and 2, examples of apparatuses and/or corresponding implementations for accelerating security inspections using inline pattern matching. Detailed descriptions of an example HTTP request and an example set of signatures that facilitate pattern matching will be provided in connection with FIGS. 3 and 4, respectively. Detailed descriptions of an example method for accelerating security inspections using inline pattern matching will be provided in connection with FIG. 5. Finally, the discussion corresponding to FIG. 6 will provide numerous examples of systems that may include the apparatuses and/or components shown in FIGS. 1 and 2.
[0015] FIG. 1 is a block diagram of an example apparatus 100 for accelerating security inspections using inline pattern matching. In one example, apparatus 100 may include and/or represent a physical firewall device. Additional examples of apparatus 100 include, without limitation, network devices, routers, switches, hubs, modems, bridges, repeaters, gateways, load balancers, multiplexers, network adapters, servers, client devices, portions of one or more of the same, variations or combinations of one or more of the same, and/or any other suitable apparatus.
[0016] As illustrated in FIG. 1, apparatus 100 may include one or more storage devices, such as storage device 102. Storage device 102 generally represents any type or form of volatile or non-volatile memory or medium capable of storing data and/or computer-readable instructions. In one example, storage device 102 may include a database that stores, loads, and/or maintains a set of signatures 104 that facilitate pattern matching in connection with network traffic. Examples of storage device 102 include, without limitation, Random Access Memory (RAM), Read Only Memory (ROM), flash memory, Hard Disk Drives, (HDDs), Solid-State Drives (SSDs), optical disk drives, caches, variations or combinations of one or more of the same, and/or any other suitable storage device.
[0017] Signatures 104 each generally represent any type or form of representation, hash, pattern, and/or data capable of being used as a reference for pattern matching. In some examples, signatures 104 may be applied to the contents (such as the header and/or the body) of an incoming packet to determine whether any portion of the packet includes and/or represents a certain data pattern. Some of signatures 104 may include and/or represent malicious patterns whose presence in a packet indicates and/or suggests that the packet is part of an attack. Additionally or alternatively, some of signatures 104 may include and/or represent patterns whose presence in a packet does not necessarily indicate and/or suggest that the packet is part of an attack.
[0018] In some examples, signatures 104 may correspond to a certain location or portion of a packet. For example, one of signatures 104 may indicate that a packet is malicious only if a corresponding data pattern is found in the header of the packet. Additionally or alternatively, another one of signatures 104 may indicate that a packet is malicious only if a corresponding data pattern is found in the body of the packet.
[0019] As illustrated in FIG. 1, apparatus 100 may also include one or more physical processing devices, such as physical processing device 106. Physical processing device 106 generally represents any type or form of hardware-implemented computing device capable of interpreting and/or executing computer-readable instructions. In one example, physical processing device 106 may access and/or modify one or more of signatures 104 stored in storage device 102. Additionally or alternatively, physical processing device 106 may enable apparatus 100 to facilitate accelerating security inspections using inline pattern matching. Examples of physical processing device 106 include, without limitation, microprocessors, microcontrollers, CPUs, GPUs, Field-Programmable Gate Arrays (FPGAs) that implement softcore processors, Application-Specific Integrated Circuits (ASICs), portions of one or more of the same, variations or combinations of one or more of the same, and/or any other suitable physical processing device.
[0020] Example apparatus 100 in FIG. 1 may be implemented in a variety of ways. For example, all or a portion of example apparatus 100 may represent portions of example implementation 200 in FIG. 2. As shown in FIG. 2, implementation 200 may include computing devices 202(1)-(N) in communication with apparatus 100 within a network 204. As will be described in greater detail below, apparatus 100 may accelerate security inspections performed on packets destined for computing devices 202(1)-(N) by using inline pattern matching.
[0021] Computing devices 202(1)-(N) generally represents any type or form of computing device capable of reading computer-executable instructions. In one example, computing devices 202(1)-(N) may include and/or represent client devices and/or end-user devices. Additional examples of computing devices 202(1)-(N) include, without limitation, laptops, tablets, desktops, servers, cellular phones, Personal Digital Assistants (PDAs), multimedia players, embedded systems, wearable devices (e.g., smart watches, smart glasses, etc.), gaming consoles, variations or combinations of one or more of the same, and/or any other suitable computing devices.
[0022] Network 204 generally represents any medium or architecture capable of facilitating communication or data transfer. In one example, network 204 may include computing devices 202(1)-(N) and apparatus 100 and/or facilitate communication between computing devices 202(1)-(N) and apparatus 100. In this example, network 204 may facilitate communication or data transfer using wireless and/or wired connections. Examples of network 204 include, without limitation, an intranet, a Wide Area Network (WAN), a Local Area Network (LAN), an enterprise network, a Personal Area Network (PAN), the Internet, Power Line Communications (PLC), a cellular network (e.g., a Global System for Mobile Communications (GSM) network), portions of one or more of the same, variations or combinations of one or more of the same, and/or any other suitable network.
[0023] In some examples, physical processing device 106 of apparatus 100 may receive a packet that is destined for computing device 202(1) within network 204. For example, a computer (not necessarily illustrated in FIG. 2) may attempt to send a packet to computing device 202(1) by way of apparatus 100. In this example, the packet may arrive at apparatus 100 via an ingress port and/or line card.
[0024] The term "packet," as used herein, generally refers to any type or form of communication and/or message that is sent and/or received by a computing device. In one example, a packet may include and/or represent an HTTP message. Additionally or alternatively, a packet may include and/or represent an Internet Protocol (IP) packet (such as an IPv4 packet and/or an IPv6 packet).
[0025] As the packet arrives at apparatus 100, physical processing device 106 may perform pattern matching on the packet. For example, physical processing device 106 may compare all or portions of the packet with the set of signatures 104 stored in storage device 102. In one example, physical processing device 106 may determine that at least one portion of the packet matches a known malicious signature from signatures 104. In the event of a pattern match, physical processing device 106 may parse the packet to determine and/or confirm whether that portion or any other portion of the packet indicates and/or suggests that the packet is malicious.
[0026] As an example, physical processing device 106 may check whether the matched portion of the packet is located in a position where that portion is indicative and/or suggestive of a malicious attack. In other words, physical processing device 106 may derive the context of the matched portion of the packet by way of parsing and then determine whether the packet is malicious based at least in part on that context. For example, physical processing device 106 may detect a certain pattern match in the header of a packet. In this example, that particular pattern may indicate and/or suggest that the packet is malicious if the pattern is located in the header of the packet. However, that same pattern may not necessarily indicate and/or suggest that the packet is malicious if the pattern were located in the body of the packet.
[0027] In another example, physical processing device 106 may determine that no portion of the packet matches any of signatures 104. As a result, physical processing device 106 may refuse to parse and/or forego parsing the packet since none of the packet matched any of signatures 104. By doing so, physical processing device 106 may eliminate a significant amount of processing overhead and/or speed up security inspections at apparatus 100 as a whole. Accordingly, physical processing device 106 may increase the efficiency of security inspections at apparatus 100 by parsing only those packets whose contents resulted in a pattern match. In other words, for a security inspection to result in a malicious classification in this example, physical processing device 106 may need to (1) detect a pattern match within a packet, (2) parse the packet to identify the context of the pattern match, and then (3) determine that the context of the pattern match is known to be malicious.
[0028] In some examples, the pattern-matching phase and the parsing phase may be performed by different components and/or devices within apparatus 100. For example, part of physical processing device 106 may include and/or represent a line card or an ASIC that performs the pattern matching on packets that arrive at apparatus 100. In this example, another part of physical processing device 106 may include and/or represent a CPU or a GPU that parses the contents of the matched packets to identify the context of the pattern matches. Accordingly, upon completing the pattern matching, the line card or ASIC may forward the packet to the CPU or GPU to perform the parsing.
[0029] In another example, the pattern-matching phase and the parsing phase may be performed by the same component and/or device within apparatus 100. For example, physical processing device 106 may include and/or represent a CPU or a GPU that performs the pattern matching on packets that arrive at apparatus 100. Upon completing the pattern matching, the CPU or GPU may then parse the contents of the matched packets to identify the context of the pattern matches.
[0030] As a specific example, an HTTP request 300 in FIG. 3 may arrive at apparatus 100 by way of an ingress port on a line card. As illustrated in FIG. 3, HTTP request 300 may include and/or identify a request line (in this example, "GET /index.html HTTP/1.1"), a header (in this example, "Host: www.suspiciouswebsite.com," "User-Agent: Mozilla/5.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; SuspiciousAgent 5.0)," "Accept: text/xml, text/html, text/plain, image/jpeg," "Accept-Language: en-us, en," "Accept-Encoding: gzip," "Keep-Alive: 300," and "Connection: keep-alive") and a body (in this example, the body is empty).
[0031] In this example, the line card may receive HTTP request 300 and then perform the pattern matching on the same. For example, the line card may compare the contents of HTTP request 300 against the set of signatures 104 in FIG. 4. As illustrated in FIG. 4, the set of signatures 104 may include and/or represent certain patterns that, in some contexts, are indicative and/or suggestive of a malicious packet (in this example, "UnknownAgent 1.0," "UnknownAgent 2.0," "SuspiciousAgent 4.0," "SuspiciousAgent 5.0," "SuspiciousAgent 6.0," "QuestionableAgent 3.0," and "QuestionableAgent 3.1"). In this example, the line card may determine that the "SuspiciousAgent 5.0" signature from the set of signatures 104 is included and/or found in HTTP request 300.
[0032] Continuing with this example, since a portion of HTTP request 300 matched the "SuspiciousAgent 5.0" signature, the line card may forward HTTP request 300 to a CPU of apparatus 100. In one example, the line card may identify an offset that corresponds to and/or represents the location of the portion of HTTP request 300 that matches the "SuspiciousAgent 5.0" signature. Additionally or alternatively, the line card may identify an index that specifies and/or points to the "SuspiciousAgent 5.0" signature within storage device 102. The line card may forward the offset and/or the index to the CPU along with HTTP request 300. For example, the line card may insert and/or append the offset and the index in a footer of HTTP request 300 prior to forwarding HTTP request 300 to the CPU.
[0033] Upon receiving HTTP request 300 from the line card, the CPU may parse HTTP request 300 to determine the context of the portion of HTTP request 300 that matched the "SuspiciousAgent 5.0" signature. In one example, the CPU may obtain the offset and the index from the footer of HTTP request 300. In this example, the CPU may parse the portion of HTTP request 300 at the offset. In other words, the CPU may extract the data and/or content from the location identified by the offset. In this way, the CPU may become a more intelligent parser by dynamically deciding whether to parse or skip certain constructs in the packet rather than simply parsing the entire packet. The CPU may then compare the data and/or content parsed from that portion of HTTP request 300 against the "SuspiciousAgent 5.0" signature specified by the index.
[0034] Continuing with this example, the CPU may determine that the data pattern corresponding to the "SuspiciousAgent 5.0" signature is found in the HTTP user-agent field within the header of HTTP request 300. The location and/or positioning of that data pattern may indicate and/or suggest that HTTP request 300 is malicious. However, if that data pattern were found within the body of HTTP request 300, that location and/or positioning may not necessarily indicate and/or suggest anything malicious about HTTP request 300.
[0035] In some examples, the CPU may collaborate with the line card to reduce the number of signatures that are applicable to certain security inspections and/or packets. For example, the CPU and/or the line card may reduce the number of applicable signatures based at least in part on the application and/or business logic involved in the communication session at issue. This reduction may improve the accuracy of the security inspection results and/or mitigate false positives.
[0036] In some examples, the CPU and/or line card may perform a dynamic pattern update that facilitates determining whether to bypass certain content included in packets during the parsing phase. Instead of parsing line-by-line until reaching the end of a packet's contents, the CPU may bypass certain contents of the packet. For example, in the event that the packet represents part of a Multi-purpose Internet Mail Extension (MIME) session in which a large file is uploaded and/or downloaded, the line card may be configured and/or updated with a MIME boundary pattern such that the CPU no longer needs to parse to the end of the file for the MIME boundary. In this example, once the line card detects the MIME boundary pattern in a packet, the CPU may go directly to the offset appended to the footer for parsing and/or inspection. Additionally or alternatively, the line card may be configured and/or designed to bypass all packets unless their MIME boundary matches the corresponding boundary pattern.
[0037] These types of 2-phase security inspections may improve the accuracy of the inspection results relative to mere pattern-matching security inspections. In other words, by performing both pattern matching and parsing, these security inspections may produce less false positives than those that include only pattern matching. Moreover, by performing the pattern-matching phase prior to the parsing phase, physical processing device 106 may accelerate the security inspections relative to traditional IPS inspections and/or improve the efficiency of the same. For example, physical processing device 106 may parse only packets with patterns that match at least one of signatures 104 during the pattern-matching phase and simply forward all other non-matching packets to their respective destinations without parsing. Additionally or alternatively, physical processing device 106 may offload the pattern matching operations to hardware engines (such as a line card and/or an ASIC) to free up and/or make available additional CPU and/or GPU resources.
[0038] In some examples, the pattern matching operations may be offloaded to hardware engines because such operations involve and/or require nothing more than a fixed algorithm, and hardware like line cards and ASICs may be able to perform the fixed algorithm at the ingress port at speeds comparable to the packet I/O rate and/or line rate. In this way, physical processing device 106 may accelerate the security inspections performed on packets arriving at apparatus 100 using inline pattern matching and subsequent selective and/or intelligent parsing.
[0039] In some examples, physical processing device 106 may perform a security action in connection with the packet upon determining that the packet is malicious. Examples of such a security action include, without limitation, dropping the packet, terminating a communication session in which the packet originated, blacklisting the device that sent the packet, combinations or variations of one or more of the same, and/or any other suitable security action.
[0040] FIG. 5 is a flow diagram of an example method 500 for accelerating security inspections using inline pattern matching. Method 500 may include the step of receiving a packet that is destined for a computing device within a network (510). This receiving step may be performed in a variety of ways. In one example, a network device within a network may detect and/or receive a packet from a computing device within the network. In another example, the network device may detect and/or receive a packet from a computing device outside of the network.
[0041] In some examples, method 500 may also include the step of performing pattern matching on the packet (520). This step may be performed in a variety of ways. In one example, the network device may compare at least a portion of the packet with a set of signatures that facilitate pattern matching (520(1)). The network device may then determine that the portion of the packet matches at least one of the signatures based at least in part on the comparison (520(2)).
[0042] In some examples, method 500 may further include the step of parsing, after performing the pattern matching, at least the portion of the packet to determine whether the packet is malicious based at least in part on the portion of the packet (530). This parsing step may be performed in a variety of ways. In one example, the network device may extract data and/or information included in certain fields of the packet. In this example, the network device may create and/or develop a context for a pattern match detected within the packet based at least in part on the extracted data and/or information.
[0043] Additionally or alternatively, method 500 may include the step of performing at least one security action in connection with the packet upon determining that the packet is malicious (540). This step may be performed in a variety of ways. In one example, the network device may drop the packet and/or terminate a communication session in which the packet originated. In another example, the network device may blacklist the computing device that sent the packet.
[0044] FIG. 6 is a block diagram of an example computing system 600 capable of implementing and/or being used in connection with one or more of the embodiments described and/or illustrated herein. In some embodiments, all or a portion of computing system 600 may perform and/or be a means for performing, either alone or in combination with other elements, one or more of the steps described in connection with FIG. 5. All or a portion of computing system 600 may also perform and/or be a means for performing and/or implementing any other steps, methods, or processes described and/or illustrated herein. In one example, computing system 600 may include apparatus 100 from FIG. 1.
[0045] Computing system 600 broadly represents any type or form of electrical load, including a single or multi-processor computing device or system capable of executing computer-readable instructions. Examples of computing system 600 include, without limitation, workstations, laptops, client-side terminals, servers, distributed computing systems, mobile devices, network switches, network routers (e.g., backbone routers, edge routers, core routers, mobile service routers, broadband routers, etc.), network appliances (e.g., network security appliances, network control appliances, network timing appliances, SSL VPN (Secure Sockets Layer Virtual Private Network) appliances, etc.), network controllers, gateways (e.g., service gateways, mobile packet gateways, multi-access gateways, security gateways, etc.), and/or any other type or form of computing system or device.
[0046] Computing system 600 may be programmed, configured, and/or otherwise designed to comply with one or more networking protocols. According to certain embodiments, computing system 600 may be designed to work with protocols of one or more layers of the Open Systems Interconnection (OSI) reference model, such as a physical layer protocol, a link layer protocol, a network layer protocol, a transport layer protocol, a session layer protocol, a presentation layer protocol, and/or an application layer protocol. For example, computing system 600 may include a network device configured according to a Universal Serial Bus (USB) protocol, an Institute of Electrical and Electronics Engineers (IEEE) 1394 protocol, an Ethernet protocol, a T1 protocol, a Synchronous Optical Networking (SONET) protocol, a Synchronous Digital Hierarchy (SDH) protocol, an Integrated Services Digital Network (ISDN) protocol, an Asynchronous Transfer Mode (ATM) protocol, a Point-to-Point Protocol (PPP), a Point-to-Point Protocol over Ethernet (PPPoE), a Point-to-Point Protocol over ATM (PPPoA), a Bluetooth protocol, an IEEE 802.XX protocol, a frame relay protocol, a token ring protocol, a spanning tree protocol, and/or any other suitable protocol.
[0047] Computing system 600 may include various network and/or computing components. For example, computing system 600 may include at least one processor 614 and a system memory 616. Processor 614 generally represents any type or form of processing unit capable of processing data or interpreting and executing instructions. For example, processor 614 may represent an application-specific integrated circuit (ASIC), a system on a chip (e.g., a network processor), a hardware accelerator, a general purpose processor, and/or any other suitable processing element.
[0048] Processor 614 may process data according to one or more of the networking protocols discussed above. For example, processor 614 may execute or implement a portion of a protocol stack, may process packets, may perform memory operations (e.g., queuing packets for later processing), may execute end-user applications, and/or may perform any other processing tasks.
[0049] System memory 616 generally represents any type or form of volatile or non-volatile storage device or medium capable of storing data and/or other computer-readable instructions. Examples of system memory 616 include, without limitation, Random Access Memory (RAM), Read Only Memory (ROM), flash memory, or any other suitable memory device. Although not required, in certain embodiments computing system 600 may include both a volatile memory unit (such as, for example, system memory 616) and a non-volatile storage device (such as, for example, primary storage device 632, as described in detail below). System memory 616 may be implemented as shared memory and/or distributed memory in a network device. Furthermore, system memory 616 may store packets and/or other information used in networking operations.
[0050] In certain embodiments, example computing system 600 may also include one or more components or elements in addition to processor 614 and system memory 616. For example, as illustrated in FIG. 6, computing system 600 may include a memory controller 618, an Input/Output (I/O) controller 620, and a communication interface 622, each of which may be interconnected via communication infrastructure 612. Communication infrastructure 612 generally represents any type or form of infrastructure capable of facilitating communication between one or more components of a computing device. Examples of communication infrastructure 612 include, without limitation, a communication bus (such as a Serial ATA (SATA), an Industry Standard Architecture (ISA), a Peripheral Component Interconnect (PCI), a PCI Express (PCle), and/or any other suitable bus), and a network.
[0051] Memory controller 618 generally represents any type or form of device capable of handling memory or data or controlling communication between one or more components of computing system 600. For example, in certain embodiments memory controller 618 may control communication between processor 614, system memory 616, and I/O controller 620 via communication infrastructure 612. In some embodiments, memory controller 618 may include a Direct Memory Access (DMA) unit that may transfer data (e.g., packets) to or from a link adapter.
[0052] I/O controller 620 generally represents any type or form of device or module capable of coordinating and/or controlling the input and output functions of a computing device. For example, in certain embodiments I/O controller 620 may control or facilitate transfer of data between one or more elements of computing system 600, such as processor 614, system memory 616, communication interface 622, and storage interface 630.
[0053] Communication interface 622 broadly represents any type or form of communication device or adapter capable of facilitating communication between example computing system 600 and one or more additional devices. For example, in certain embodiments communication interface 622 may facilitate communication between computing system 600 and a private or public network including additional computing systems. Examples of communication interface 622 include, without limitation, a link adapter, a wired network interface (such as a network interface card), a wireless network interface (such as a wireless network interface card), and any other suitable interface. In at least one embodiment, communication interface 622 may provide a direct connection to a remote server via a direct link to a network, such as the Internet. Communication interface 622 may also indirectly provide such a connection through, for example, a local area network (such as an Ethernet network), a personal area network, a wide area network, a private network (e.g., a virtual private network), a telephone or cable network, a cellular telephone connection, a satellite data connection, or any other suitable connection.
[0054] Incertain embodiments, communication interface 622 may also represent a host adapter configured to facilitate communication between computing system 600 and one or more additional network or storage devices via an external bus or communications channel. Examples of host adapters include, without limitation, Small Computer System Interface (SCSI) host adapters, Universal Serial Bus (USB) host adapters, IEEE 1394 host adapters, Advanced Technology Attachment (ATA), Parallel ATA (PATA), Serial ATA (SATA), and External SATA (eSATA) host adapters, Fibre Channel interface adapters, Ethernet adapters, or the like. Communication interface 622 may also enable computing system 600 to engage in distributed or remote computing. For example, communication interface 622 may receive instructions from a remote device or send instructions to a remote device for execution.
[0055] As illustrated in FIG. 6, example computing system 600 may also include a primary storage device 632 and/or a backup storage device 634 coupled to communication infrastructure 612 via a storage interface 630. Storage devices 632 and 634 generally represent any type or form of storage device or medium capable of storing data and/or other computer-readable instructions. For example, storage devices 632 and 634 may represent a magnetic disk drive (e.g., a so-called hard drive), a solid state drive, a floppy disk drive, a magnetic tape drive, an optical disk drive, a flash drive, or the like. Storage interface 630 generally represents any type or form of interface or device for transferring data between storage devices 632 and 634 and other components of computing system 600.
[0056] In certain embodiments, storage devices 632 and 634 may be configured to read from and/or write to a removable storage unit configured to store computer software, data, or other computer-readable information. Examples of suitable removable storage units include, without limitation, a floppy disk, a magnetic tape, an optical disk, a flash memory device, or the like. Storage devices 632 and 634 may also include other similar structures or devices for allowing computer software, data, or other computer-readable instructions to be loaded into computing system 600. For example, storage devices 632 and 634 may be configured to read and write software, data, or other computer-readable information. Storage devices 632 and 634 may be a part of computing system 600 or may be separate devices accessed through other interface systems.
[0057] Many other devices or subsystems may be connected to computing system 600. Conversely, all of the components and devices illustrated in FIG. 6 need not be present to practice the embodiments described and/or illustrated herein. The devices and subsystems referenced above may also be interconnected in different ways from those shown in FIG. 6. Computing system 600 may also employ any number of software, firmware, and/or hardware configurations. For example, one or more of the example embodiments disclosed herein may be encoded as a computer program (also referred to as computer software, software applications, computer-readable instructions, or computer control logic) on a computer-readable medium. The term "computer-readable medium" generally refers to any form of device, carrier, or medium capable of storing or carrying computer-readable instructions. Examples of computer-readable media include, without limitation, transmission-type media, such as carrier waves, and non-transitory-type media, such as magnetic-storage media (e.g., hard disk drives and floppy disks), optical-storage media (e.g., Compact Disks (CDs) and Digital Video Disks (DVDs)), electronic-storage media (e.g., solid-state drives and flash media), and other distribution systems.
[0058] Therefore, from one perspective, there has been described that an apparatus may include a physical processing that (1) receives, at a network device, a packet that is destined for a computing device within a network, (2) performs pattern matching on the packet by (A) comparing at least a portion of the packet with a set of signatures that facilitate pattern matching in connection with network traffic and (B) determining, based at least in part on the comparison, that the portion of the packet matches at least one of the signatures, (3) parses, after performing the pattern matching, at least the portion of the packet to determine whether the packet is malicious based at least in part on the portion of the packet, and then (4) upon determining that the portion of the packet is malicious, performs at least one security action in connection with the packet. Various other apparatuses, systems, and methods are also disclosed.
[0059] While the foregoing disclosure sets forth various embodiments using specific block diagrams, flowcharts, and examples, each block diagram component, flowchart step, operation, and/or component described and/or illustrated herein may be implemented, individually and/or collectively, using a wide range of hardware, software, or firmware (or any combination thereof) configurations. In addition, any disclosure of components contained within other components should be considered as being by way of example in nature since many other architectures can be implemented to achieve the same functionality.
[0060] In some examples, all or a portion of apparatus 100 in FIG. 1 may represent portions of a cloud-computing or network-based environment. Cloud-computing and network-based environments may provide various services and applications via the Internet. These cloud-computing and network-based services (e.g., software as a service, platform as a service, infrastructure as a service, etc.) may be accessible through a web browser or other remote interface. Various functions described herein may also provide network switching capabilities, gateway access capabilities, network security functions, content caching and delivery services for a network, network control services, and/or and other networking functionality.
[0061] In addition, one or more of the modules described herein may transform data, physical devices, and/or representations of physical devices from one form to another. Additionally or alternatively, one or more of the modules recited herein may transform a processor, volatile memory, non-volatile memory, and/or any other portion of a physical computing device from one form to another by executing on the computing device, storing data on the computing device, and/or otherwise interacting with the computing device.
[0062] The process parameters and sequence of the steps described and/or illustrated herein are given by way of example only and can be varied as desired. For example, while the steps illustrated and/or described herein may be shown or discussed in a particular order, these steps do not necessarily need to be performed in the order illustrated or discussed. The various example methods described and/or illustrated herein may also omit one or more of the steps described or illustrated herein or include additional steps in addition to those disclosed.
[0063] The preceding description has been provided to enable others skilled in the art to best utilize various aspects of the example embodiments disclosed herein. This description is not intended to be exhaustive or to be limited to any precise form disclosed. Many modifications and variations are possible without departing from the scope of the instant disclosure. The embodiments disclosed herein should be considered in all respects illustrative and not restrictive. Reference should be made to the appended claims and their equivalents in determining the scope of the instant disclosure.
[0064] Unless otherwise noted, the terms "connected to" and "coupled to" (and their derivatives), as used in the specification and claims, are to be construed as permitting both direct and indirect (i.e., via other elements or components) connection. In addition, the terms "a" or "an," as used in the specification and claims, are to be construed as meaning "at least one of." Finally, for ease of use, the terms "including" and "having" (and their derivatives), as used in the specification and claims, are interchangeable with and have the same meaning as the word "comprising."
at least one storage device (102) configured to store a set of signatures that facilitate pattern matching in connection with network traffic; and
at least one physical processing device (106) communicatively coupled to the storage device;
at least one hardware accelerator (614) communicatively coupled to the physical processing device, wherein the hardware accelerator is configured to:
receive (510) a packet that is destined for a computing device within a network, wherein the packet is unparsed upon receipt by the hardware accelerator;
perform (520) pattern matching on the packet by:
comparing (520(1))at least a portion of the packet with the set of signatures stored in the storage device; and
determining (520(2)), based at least in part on the comparison, that the portion of the packet matches at least one of the signatures;
identify an offset that corresponds to a location of the portion of the packet that matches the signature;
identify an index that specifies, relative to the storage device, the signature to which the portion of the packet matches;
insert the offset and the index in a footer of the packet prior to forwarding the packet to the physical processing device; and
forward the packet including the footer to the physical processing device;
wherein the physical processing device is configured to:
receive the packet from the hardware accelerator after completion of the pattern matching by the hardware accelerator;
obtain the offset and index from the footer of the packet;
parse (530), in response to the hardware accelerator determining that the portion of the packet matches at least one of the signatures, at least the portion of the packet to determine whether the packet is malicious based at least in part on the offset and the index of the portion of the packet by:
extracting content from the location in the packet identified by the offset; and
comparing the content extracted from the portion of the packet at the offset with the at least one of the signatures specified by the index; and
perform (540), upon determining that the packet is malicious, at least one security action in connection with the packet.
a Central Processing Unit (CPU); and
a Graphics Processing Unit (GPU).
a line card; and
an Application Specific Integrated Circuit (ASIC).
a payload of the packet; and
a header of the packet.
receive another packet that is destined for a computing device within the network;
perform pattern matching on the other packet by:
comparing the other packet with the set of signatures stored in the storage device; and
determining, based at least in part on the comparison, that no portion of the other packet matches any of the signatures; and
the physical processing device is configured to refuse to parse the other packet due at least in part to no portion of the packet matching any of the signatures.
dropping the packet;
terminating a communication session in which the packet originated; and
blacklisting a device that sent the packet.
receiving (510), by a hardware accelerator, a packet that is destined for a computing device within a network, wherein the packet is unparsed upon receipt by the hardware accelerator;
performing (520), by the hardware accelerator, pattern matching on the packet by:
comparing (520(1)) at least a portion of the packet with a set of signatures that facilitate pattern matching in connection with network traffic, the signatures being stored within a storage device; and
determining (520(2)), based at least in part on the comparison, that the portion of the packet matches at least one of the signatures;
identifying, by the hardware accelerator, an offset that corresponds to a location of the portion of the packet that matches the signature;
identifying, by the hardware accelerator, an index that specifies, relative to the storage device, the signature to which the portion of the packet matches;
inserting, by the hardware accelerator, the offset and the index in a footer of the packet prior to forwarding the packet to the physical processing device; and
forwarding, by the hardware accelerator, the packet including the footer to a physical processing device that is communicatively coupled to the hardware accelerator;
receiving, by the physical processing device, the packet from the hardware accelerator after completion of the pattern matching by the hardware accelerator;
obtaining, by the physical processing device, the offset and index from the footer of the packet;
parsing (530), in response to the hardware accelerator determining that the portion of the packet matches at least one of the signatures, by the physical processing device, at least the portion of the packet to determine whether the packet is malicious based at least in part on the offset and the index of the portion of the packet by:
extracting content from the location in the packet identified by the offset; and
comparing the content extracted from the portion of the packet at the offset with the at least one of the signature specified by the index; and
upon determining that the packet is malicious, performing (540), by the physical processing device, at least one security action in connection with the packet.
mindestens eine Speicherungsvorrichtung (102), ausgelegt zum Speichern einer Menge von Signaturen, die Musterabgleich in Verbindung mit Netzwerkverkehr erleichtern; und
mindestens eine physische Verarbeitungsvorrichtung (106), kommunizierend mit der Speicherungsvorrichtung gekoppelt;
mindestens einen Hardwarebeschleuniger (614), kommunizierend mit der physischen Verarbeitungsvorrichtung gekoppelt, wobei der Hardwarebeschleuniger ausgelegt ist zum:
Empfangen (510) eines Pakets, das für eine Rechenvorrichtung innerhalb eines Netzwerks bestimmt ist, wobei das Paket bei Empfang durch den Hardwarebeschleuniger nicht geparsed wird;
Durchführen (520) von Musterabgleich an dem Paket durch:
Vergleichen (520(1)) mindestens eines Anteils des Pakets mit der Menge von Signaturen, die in der Speicherungsvorrichtung gespeichert ist; und
Bestimmen (520(2)), zumindest teilweise basierend auf dem Vergleich, dass der Anteil des Pakets mit mindestens einer der Signaturen übereinstimmt;
Identifizieren eines Versatzes, der einem Ort des Anteils des Pakets, das mit der Signatur übereinstimmt, entspricht;
Identifizieren eines Indexes, der, relativ zu der Speicherungsvorrichtung, die Signatur, mit der der Anteil des Pakets übereinstimmt, spezifiziert;
Einsetzen des Versatzes und des Indexes in einen Footer des Pakets, bevor das Paket an die physische Verarbeitungsvorrichtung weitergeleitet wird; und
Weiterleiten des Pakets, das den Footer beinhaltet, an die physische Verarbeitungsvorrichtung; wobei die physische Verarbeitungsvorrichtung ausgelegt ist zum:
Empfangen des Pakets von dem Hardwarebeschleuniger nach Abschluss des Musterabgleichs durch den Hardwarebeschleuniger;
Erhalten des Versatzes und des Indexes aus dem Footer des Pakets;
Parsen (530), als Reaktion darauf, dass der Hardwarebeschleuniger bestimmt, dass der Anteil des Pakets mit mindestens einer der Signaturen übereinstimmt, mindestens eines Anteils des Pakets, um zu bestimmen, ob das Paket schädlich ist, zumindest teilweise basierend auf dem Versatz und dem Index des Anteils des Pakets durch:
Extrahieren von Inhalt von dem Ort in dem Paket, der durch den Versatz identifiziert wird; und
Vergleichen des aus dem Anteil des Pakets an dem Versatz extrahierten Inhalts mit der mindestens einen der durch den Index spezifizierten Signaturen; und
Durchführen (540), nach Bestimmen, dass das Paket schädlich ist, mindestens einer Sicherheitsaktion in Verbindung mit dem Paket.
eine zentrale Verarbeitungseinheit bzw. CPU; und
eine Graphikverarbeitungseinheit bzw. GPU.
eine Leitungskarte; und
eine anwendungsspezifische integrierte Schaltung bzw. ASIC.
eine Datennutzlast des Pakets; und
einen Header des Pakets.
Empfangen eines anderen Pakets, das für eine Rechenvorrichtung innerhalb des Netzwerks bestimmt ist;
Durchführen von Musterabgleich an dem anderen Paket durch:
Vergleichen des anderen Pakets mit der Menge von Signaturen, die in der Speicherungsvorrichtung gespeichert ist; und
Bestimmen, zumindest teilweise basierend auf dem Vergleich, dass kein Anteil des anderen Pakets
mit irgendeiner der Signaturen übereinstimmt; und die physische Verarbeitungsvorrichtung dafür ausgelegt ist, Parsen des anderen Pakets, zumindest teilweise aufgrund dessen, dass kein Anteil des Pakets mit irgendeiner der Signaturen übereinstimmt, zu verweigern.
Verwerfen des Pakets;
Beenden einer Kommunikationssitzung, aus der das Paket stammt; und
Setzen auf die Blockierliste von einer Vorrichtung, die das Paket gesendet hat.
Empfangen (510), durch einen Hardwarebeschleuniger, eines Pakets, das für eine Rechenvorrichtung innerhalb eines Netzwerks bestimmt ist, wobei das Paket bei Empfang durch den Hardwarebeschleuniger nicht geparsed wird;
Durchführen (520), durch den Hardwarebeschleuniger, von Musterabgleich an dem Paket durch:
Vergleichen (520(1)) mindestens eines Anteils des Pakets mit einer Menge von Signaturen, die Musterabgleich in Verbindung mit Netzwerkverkehr erleichtern, wobei die Signaturen innerhalb einer Speicherungsvorrichtung gespeichert werden; und
Bestimmen (520(2)), zumindest teilweise basierend auf dem Vergleich, dass der Anteil des Pakets mit mindestens einer der Signaturen übereinstimmt;
Identifizieren, durch den Hardwarebeschleuniger, eines Versatzes, der einem Ort des Anteils des Pakets, das mit der Signatur übereinstimmt, entspricht;
Identifizieren, durch den Hardwarebeschleuniger, eines Indexes, der, relativ zu der Speicherungsvorrichtung, die Signatur, mit der der Anteil des Pakets übereinstimmt, spezifiziert;
Einsetzen, durch den Hardwarebeschleuniger, des Versatzes und des Indexes in einen Footer des Pakets, bevor das Paket an die physische Verarbeitungsvorrichtung weitergeleitet wird; und
Weiterleiten, durch den Hardwarebeschleuniger, des Pakets, das den Footer beinhaltet, an eine physische Verarbeitungsvorrichtung, die kommunizierend mit dem Hardwarebeschleuniger gekoppelt ist;
Empfangen, durch die physische Verarbeitungsvorrichtung, des Pakets von dem Hardwarebeschleuniger nach Abschluss des Musterabgleichs durch den Hardwarebeschleuniger;
Erhalten, durch die physische Verarbeitungsvorrichtung, des Versatzes und des Indexes aus dem Footer des Pakets;
Parsen (530), als Reaktion darauf, dass der Hardwarebeschleuniger bestimmt, dass der Anteil des Pakets mit mindestens einer der Signaturen übereinstimmt, durch die Verarbeitungsvorrichtung, mindestens des Anteils des Pakets, um zu bestimmen, ob das Paket schädlich ist, zumindest teilweise basierend auf dem Versatz und dem Index des Anteils des Pakets durch:
Extrahieren von Inhalt von dem Ort in dem Paket, der durch den Versatz identifiziert wird; und
Vergleichen des aus dem Anteil des Pakets an dem Versatz extrahierten Inhalts mit mindestens einer der durch den Index spezifizierten Signatur; und
bei Bestimmen, dass das Paket schädlich ist, Durchführen (540), durch die physische Verarbeitungsvorrichtung, mindestens einer Sicherheitsaktion in Verbindung mit dem Paket.
au moins un dispositif de stockage (102) configuré pour stocker un ensemble de signatures qui facilitent la mise en correspondance de modèles en relation avec un trafic de réseau ; et
au moins un dispositif de traitement physique (106) couplé de manière communicative au dispositif de stockage ;
au moins un accélérateur matériel (614) couplé de manière communicative au dispositif de traitement physique, dans lequel l'accélérateur matériel est configuré pour :
recevoir (510) un paquet destiné à un dispositif informatique au sein d'un réseau, dans lequel le paquet n'est pas analysé syntaxiquement à sa réception par l'accélérateur matériel ;
réaliser une mise en correspondance de modèles (520) sur le paquet en :
comparant (520(1)) au moins une partie du paquet à l'ensemble de signatures stockées dans le dispositif de stockage ; et
déterminant (520(2)), en fonction au moins en partie de la comparaison, que la partie du paquet correspond à au moins une des signatures ;
identifier un décalage qui correspond à un emplacement de la partie du paquet qui correspond à la signature ;
identifier un indice qui spécifie, par rapport au dispositif de stockage, la signature à laquelle correspond la partie du paquet ;
insérer le décalage et l'indice dans un pied de page du paquet avant de transmettre le paquet au dispositif de traitement physique ; et
transmettre le paquet comportant le pied de page au dispositif de traitement physique ;
dans lequel le dispositif de traitement physique est configuré pour :
recevoir le paquet à partir de l'accélérateur matériel au terme de la mise en correspondance de modèles par l'accélérateur matériel ;
obtenir le décalage et l'indice à partir du pied de page du paquet ;
analyser syntaxiquement (530), en réponse à la détermination par l'accélérateur matériel que la partie du paquet correspond à au moins une des signatures, au moins la partie du paquet pour déterminer que le paquet est malveillant ou non en fonction au moins en partie du décalage et de l'indice de la partie du paquet en :
extrayant le contenu de l'emplacement dans le paquet identifié par le décalage ; et
comparant le contenu extrait de la partie du paquet au décalage à l'au moins une des signatures spécifiées par l'indice ; et
réaliser (540), après avoir déterminé que le paquet est malveillant, au moins une action de sécurité relativement au paquet.
une unité centrale de traitement (CPU) ; et
une unité de traitement graphique (GPU).
une carte de ligne ; et
un circuit intégré spécifique à l'application (ASIC) .
une charge utile du paquet ; et
un en-tête du paquet.
recevoir un autre paquet destiné à un dispositif informatique au sein du réseau ;
réaliser une mise en correspondance de modèles sur l'autre paquet en :
comparant l'autre paquet à l'ensemble de signatures stockées dans le dispositif de stockage ; et
déterminant, en fonction au moins en partie de la comparaison, qu'aucune partie de l'autre paquet ne correspond à une quelconque signature ; et
le dispositif de traitement physique est configuré pour refuser d'analyser syntaxiquement l'autre paquet en raison au moins en partie de l'absence de correspondance d'une partie du paquet avec l'une des signatures.
l'abandon du paquet ;
la cessation d'une session de communication d'où provient le paquet ; et
la mise sur liste noire d'un dispositif à l'origine du paquet.
la réception (510), par un accélérateur matériel, d'un paquet destiné à un dispositif informatique au sein d'un réseau, dans lequel le paquet n'est pas analysé syntaxiquement à sa réception par l'accélérateur matériel;
la réalisation (520), par l'accélérateur matériel, d'une mise en correspondance de modèles sur le paquet en :
comparant (520(1)) au moins une partie du paquet à un ensemble de signatures stockées dans le dispositif de stockage ; et
déterminant (520(2)), en fonction au moins en partie de la comparaison, que la partie du paquet correspond à au moins une des signatures ;
l'identification, par l'accélérateur matériel, d'un décalage qui correspond à un emplacement de la partie du paquet qui correspond à la signature ;
l'identification, par l'accélérateur matériel, d'un indice qui spécifie, par rapport au dispositif de stockage, la signature à laquelle correspond la partie du paquet ;
l'insertion, par l'accélérateur matériel, du décalage et de l'indice dans un pied de page du paquet avant de transmettre le paquet au dispositif de traitement physique ; et
la transmission, par l'accélérateur matériel, du paquet comportant le pied de page au dispositif de traitement physique ;
la réception, par le dispositif de traitement physique, du paquet à partir de l'accélérateur matériel au terme de la mise en correspondance de modèles par l'accélérateur matériel ;
l'obtention, par le dispositif de traitement physique, du décalage et de l'indice à partir du pied de page du paquet ;
l'analyse syntaxe (530), en réponse à la détermination par l'accélérateur matériel que la partie du paquet correspond à au moins une des signatures, par le dispositif de traitement physique, d'au moins la partie du paquet pour déterminer que le paquet est malveillant ou non en fonction au moins en partie du décalage et de l'indice de la partie du paquet en :
extrayant le contenu de l'emplacement dans le paquet identifié par le décalage ; et
comparant le contenu extrait de la partie du paquet au décalage à l'au moins une des signatures spécifiées par l'indice ; et
à la détermination que le paquet est malveillant, la réalisation (540), par le dispositif de traitement physique, d'au moins une action de sécurité relativement au paquet.
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This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.
Patent documents cited in the description