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CN100369434C - Method of Realizing Virtual Local Area Network Based on WAPI System in Wireless Local Area Network - Google Patents

Method of Realizing Virtual Local Area Network Based on WAPI System in Wireless Local Area Network Download PDF

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Publication number
CN100369434C
CN100369434C CNB2006101044322A CN200610104432A CN100369434C CN 100369434 C CN100369434 C CN 100369434C CN B2006101044322 A CNB2006101044322 A CN B2006101044322A CN 200610104432 A CN200610104432 A CN 200610104432A CN 100369434 C CN100369434 C CN 100369434C
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vlan
ugid
user
portable terminal
certificate
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CN1905504A (en
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郭宏
曹军
李轶军
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China Iwncomm Co Ltd
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China Iwncomm Co Ltd
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Abstract

The invention relate to WLAN field, a method for implementing WAPI system-based virtual LAN (VLAN) in WLAN. And it is based on GB15629.11-specified WAPI safe structure, adopts user certificate according with GB15629.11, and on the basis that GB15629.11-specified user certificate possesses unused field and supports user custom, sets mapping relation attribute of mobile terminal (MT) certificate, MAC address of MT, user group ID (UGID) and VLAN ID, and wireless access point (AP) checks and sets the attribute and transfers or discards corresponding data according to the provisions of the attribute, thus implementing a function that WLAN supports VLAN.

Description

Wireless local network is based on the method for the VLAN of WAPI system
Technical field
The present invention relates to the WLAN (wireless local area network) field, particularly a kind of wireless local network is based on the method for the VLAN of WAPI system.
Background technology
In order to narrate conveniently, below adopted the abbreviation in some present technique fields, its implication is as follows:
AP (Access Point): WAP (wireless access point)
AS (Authentication Server): authentication server
MAC (Medium Access Control): media interviews control
MT (Mobile Terminal): portable terminal
Mutiple-SSID: a plurality of service set
SSID (Service Set IDentifier): service set
UGID (User Group IDentifier): user grouping sign
VLAN (Virtual Local Area Network): VLAN
VLAN ID (VLAN IDentifier): VLAN ID
WAPI (WLAN Authentication and Privacy Infrastructure): WAPI
WLAN (Wireless Local Area Network): WLAN (wireless local area network)
Cable network user: refer to be articulated in the device end of cable network, comprise and use the interconnected AP of wired ethernet form.
WLAN (wireless local area network) WLAN not only supports mobile computing, and has flexible, the quick and extendible characteristic of framework.It mainly is made up of equipment such as portable terminal MT, wireless access point AP and authentication server AS, and wherein MT can be in net moves arbitrarily, and AP realizes cell management, to management and the bridging functionality of MT, and AS realizes the discriminating to MT.This system is widely used, and the occasion that is difficult in commerce NET (mainly being company intranet), organization user's network (as public security, finance, Government departments etc.), cell networks (as school, hospital, residential area etc.), remote monitoring or centralized monitor, casual network (as temporary meeting etc.), outdoor mobile subscriber, wiring, the occasion that needs often change etc. are all very useful.
For WLAN (wireless local area network), its safety problem is more than serious many of wired ethernet, and China has given the attention of height to this.In May, 2003, country issued the mandatory standard GB 15629.11 of WLAN (wireless local area network), and this is that present China is at the unique consensus standard in this field.Comprised brand-new WAPI security mechanism in the standard,, thoroughly solved the security breaches that exist in the external consensus standard by to the discriminating of user identity with to transmitting the encryption of data.
In traditional wlan network, for the legal MT user who differentiates by access, the AP end is not treated with a certain discrimination, and promptly same AP MT control, successful access network enjoys identical right or ability, can visit mutually, realizes common functions such as network neighbor.And in the practical application, usually need to be treated differently MT, promptly the user wishes to realize the exchanging visit between the specific MT, rather than any exchanging visit between all MT, such as, the user is divided by group, Nei MT can exchange visits on the same group, and the MT between on the same group can not visit mutually.In fact these demands belong to the solution of a problem: insert the realization of two layers of isolation between the MT under the same AP of wlan network.
In traditional wired ethernet, by dividing the logic section that virtual LAN VLAN can realize network, i.e. the code name of VLAN ID as the different user grouping generally adopted in two layers of isolation between the main frame of the different VLAN of realization access.At WLAN (wireless local area network) WLAN, especially in the hybrid network of wire/wireless, realize two layers of isolation features of user data of similar wired VLAN, and can smoothly combine with existing wired vlan technology, applied in any combination, become the very urgent demand of user, as realizing:
1, Channel Sharing
In a public hot spot region, may there be a plurality of operators, for example in the inside, an airport, may there be the network of one or more different airlines, and several different operator, they provide any wireless network services of oneself respectively.Yet radio frequency resources is public and scarce rare, uses own access device (as AP) if each Internet service provider all sets up, and will produce interference between AP and influences result of use.If use a single AP, by user isolation grouping, then this equipment of reusable.
2, cut operating costs
The equipment of WLAN and the investment of deployment are huger, and under the current economic environment, in public area, it is unpractical investing the focus of disposing oneself separately by different operators.If the mode shared network facility by common investment or channel are rented can reduce the investment and the maintenance cost of operator greatly.Two layers of isolation technology of user are for this purpose realizes providing technical assurance.
3, improve fail safe and take into account application flexibility
By two layers of isolation technology of user, two layers of visit between each user's group are forbidden, have so just improved fail safe to a certain extent, but provide more selection mode for application simultaneously.
4, provide different access and service strategies
Differentiate and access control service in conjunction with traditional user,, can realize delineation of power easily based on user identity by assigning different service and access control policy for different users organizes.
The existing technical method of VLAN division (being two layers of isolation of user) of realizing in wlan network mainly contains following two kinds:
First kind of solution that is based on the Mutiple-SSID+VLAN switch, its basic principle is: a physics AP equipment need be supported a plurality of different SSID coexistences simultaneously, and setting up among the AP mapping relations of VLAN ID among the SSID and last layer switch, the VLAN wired to realize, that WLAN (wireless local area network) is unified distributes and access control policy.AP and last layer switch are according to existing wired VLAN protocol communication.This scheme requires extensive use, and the transmit mechanism of the beacon frame of standardized AP broadcasting and network insertion are surveyed treatment mechanism and are transformed, this need significantly revise WLAN (wireless local area network) standard GB 15629.11-2003 and the multiple implementation of application chip, what is more important: SSID is the basic network parameter that the user can arbitrarily import or revise, this scheme inserts distinguishing rule with this safety measure that very easily is found and can be usurped easily of SSID as the user, and internet security can't be guaranteed at all.
Second kind of solution that is based on MAC Address grouping+VLAN switch, its basic principle is: AP equipment need be supported the function with different MAC Address groupings, and need set up the mapping relations of VLAN ID in the grouping of MAC Address among the AP and the last layer switch, the VLAN wired to realize, that WLAN (wireless local area network) is unified distributes and access control policy.AP and last layer switch are according to existing wired VLAN protocol communication.This scheme divides into groups to isolate based on MAC Address, though do not relate to support requirement to bottom chip, but several big defectives are arranged: the fail safe of at first this scheme is relatively poor, can't tackle some malice and connect, as the attack of modes such as " MAC address spoofings "; Secondly this scheme flexibility is relatively poor, owing to want artificial input manager MAC Address, so for the configuration management meeting of the AP management workload heavy for the keeper brings, the more important thing is: the AP apparatus manager can't determine user's MAC Address at all in advance in the telecom operation, and therefore this method telecom operators can't adopt; Moreover this scheme technical threshold is lower, is difficult to form the effective competition power of product.
After standard GB 15629.11 is implemented, the WAPI secure scheme becomes the sole criterion of the CCCi of WLAN (wireless local area network) country authentication, the WLAN (wireless local area network) product that promptly only meets the WAPI secure scheme of GB definition could obtain national CCCi authentication, and the therefore following WLAN (wireless local area network) product that meets national standard and authenticate by CCCi will become main flow.
Summary of the invention
Problem to be solved by this invention is: a kind of efficient, safety is provided, and applying flexible in the method for wireless local network based on the VLAN of WAPI system, this method meets standard GB 15629.11, can fundamentally solve the function that exists in the above-mentioned prior art and the contradiction of security performance.
The technical method case that the present invention addresses the above problem is: the wireless local network that is provided based on the method for the VLAN of WAPI system is: based on the WAPI security architecture of standard GB 15629.11 regulations, employing meets the user certificate of standard GB 15629.11 regulations, have at the user certificate of standard GB 15629.11 regulation and not use field and support on the user-defined basis, set portable terminal MT certificate, the media interviews control MAC Address of portable terminal MT, mapping relations attribute between user grouping sign UGID and virtual LAN VLAN ID, the wireless access point AP inspection also is provided with this attribute, and carry out corresponding data forwarding or abandon, thereby realize WLAN virtual support local area network (LAN) functionality of vlan according to the regulation of this attribute.
Mapping relations attribute between the MAC Address of above-mentioned said setting portable terminal MT certificate, portable terminal MT, user grouping sign UGID and virtual LAN VLAN ID, the wireless access point AP inspection also is provided with this attribute, and to carry out corresponding data forwarding or abandon according to the regulation of this attribute be core mechanism of the present invention, and its step is as follows:
1) on the user certificate architecture basics that meets standard GB 15629.11 regulations, in portable terminal MT certification hierarchy, set up user grouping identify label (UGID), for not changing certification hierarchy and length, accomplish to meet GB15629.11, should use standard to define but untapped certificate field is represented UGID, this UGID represents to hold the sign of the wireless VLAN under the portable terminal MT user of this certificate;
Above-mentioned said use standard has defined but untapped certificate field is represented user grouping identify label (UGID) and is meant attribute field or the extended field that uses certificate.
2) comprise the portable terminal MT certificate of UGID by certificate authority person generation, and be presented to portable terminal MT user;
3) portable terminal MT is when the wireless access point AP request is differentiated, pass through if differentiate, then AP is according to the UGID in this certificate, with the MAC Address of MT deposit in by AP set up and the MAC Address mapping relations table of the UGID that safeguards and MT in, portable terminal MT with identical UGID belongs to same group, have the identical network rights of using, promptly they belong to same wireless VLAN (VLAN in the WLAN (wireless local area network));
4) behind the completing steps 3., access point AP sets up and safeguards UGID and wired VLAN ID (Ethernet first line of a couplet port of AP, it is cable port, VLAN in the cable LAN that is connected) mapping relations between, it is related that wireless VLAN and wired VLAN are set up, thereby make portable terminal MT also can join among wired VLAN;
5) for the data between the portable terminal MT that inserts same AP, access point AP only transmits the data message between the portable terminal MT with identical UGID, does not transmit data between different user grouping (user grouping that promptly has different UGID);
6) for the data that transmit between portable terminal MT and the cable network user, access point AP only transmits UGID and wired VLAN ID has the MT of mapping relations and the data between the cable network user, and all the other will not be transmitted;
When 7) portable terminal MT removed with current access point AP related, AP removed UGID, MAC Address and the VLAN ID mapping relations of this MT from the mapping relations table.
Said process as shown in Figure 1, wherein, the step 3 among the figure has comprised above-mentioned step 3 and 4.
Compared with prior art, the present invention has following advantage:
1. complete compatible standard GB 15629.11.The existing WLAN (wireless local area network) product that meets the WAPI secure scheme is after increasing the function that realizes according to the inventive method, and any variation does not take place the character that meets GB that originally had;
2. realize simple.The inventive method is utilized the extendible characteristic of WAPI certificate, only needs certificate format is adjusted slightly, and the AP part only needs to increase disposable inquiry judging function, and the MT part need not change, and does not more relate to any change of hardware and WAPI agreement.
3. fully automatic working.The flow process of setting up of wireless VLAN follows the WAPI identification flow closely, is finished automatically by AP fully, does not need any human intervention of AP keeper or pre-configured.
4. wireless VLAN is set up fast.The process that every user adds wireless VLAN (grouping) only needs AP to carry out disposable judgement, and follows the certificate identification flow closely, and total time is limited in Millisecond.
5. the wireless VLAN variation is convenient.Because rule of classification provides by certificate, and group member's state of wireless VLAN is along with MT user's adding with release dynamic change, so rule of classification only needs to change the MT certificate and gets final product when changing.
6. smoothly merge with wired vlan technology fully.Having/wlan network of wireless mixing in, the wireless VLAN that this method realizes and existing wired VLAN can applied in any combination, can form unified VLAN according to unified user grouping principle.
Description of drawings
Fig. 1 is the flow chart of the method for the invention.
Fig. 2 is an access phase of the present invention---the flow chart that VLAN sets up.
Fig. 3 is that AP of the present invention handles the data flowchart that MT sends.
Embodiment
The flow process of the method for the invention as shown in Figure 1, specifying as previously mentioned of its process repeats no more here.
Referring to Fig. 2, the process of setting up of WLAN VLAN is described with the flow process in MT access WLAN AP stage:
MT before the visited WLAN network, must at first apply for and install issue by the certificate authority person, comprise the MT certificate of UGID.The first step that MT inserts wlan network is that MT is associated to AP, finishes MT according to the WAPI identification flow of GB15629.11 regulation between MT and the AP thereafter and differentiates (being called discriminating in the standard), and in this process, AP can obtain the MAC Address of this MT simultaneously.If differentiate failure, then AP removes related with MT, otherwise, AP resolves (by reading the MT certificate) and obtains UGID, set up and preserve the UGID-MTMAC address one VLAN ID mapping relations of determining according to the VLAN division rule of advance planning afterwards, determine affiliated WLANVLAN and the wired VLAN of MT that current discriminating finishes, set up flow process thereby finish whole VLAN.The data flow that sends with AP processing MT is the workflow of the WLAN VLAN of example explanation the present invention foundation below, as shown in Figure 3:
After AP receives the data message that MT sends, at first obtain the source MAC and the target MAC (Media Access Control) address of this data message according to the normal process flow process, whole UGID-MT MAC Address one VLAN ID mapping relations that AP inquiry is afterwards preserved are also judged: if the corresponding same UGID of source MAC and target MAC (Media Access Control) address, then AP normally transmits this data message, and communication is finished; Otherwise AP continues to judge whether corresponding same VLAN ID of source MAC and target MAC (Media Access Control) address, if "Yes" is then normally transmitted data message, if "No" then is judged to be illegal (violation VLAN division rule), AP abandons this data message, sign off.

Claims (2)

1. a wireless local network is based on the method for the VLAN of WAPI system, it is characterized in that user certificate in standard GB 15629.11 regulation has does not use field and supports on the user-defined basis, media interviews control MAC Address, the user grouping of setting portable terminal MT certificate, portable terminal MT identify the mapping relations attribute between UGID and virtual LAN VLAN ID, the wireless access point AP inspection also is provided with this attribute, and carry out corresponding data forwarding or abandon according to the regulation of this attribute, its step is as follows:
1) on the user certificate architecture basics that meets standard GB 15629.11 regulations, in portable terminal MT certification hierarchy, set up user grouping identify label UGID, the use standard has defined but untapped certificate field is represented UGID, and this UGID represents to hold the sign of the wireless VLAN under the portable terminal MT user of this certificate;
2) comprise the portable terminal MT certificate of UGID by certificate authority person generation, and be presented to portable terminal MT user;
3) portable terminal MT is when the wireless access point AP request is differentiated, pass through if differentiate, then AP is according to the UGID in this certificate, with the MAC Address of MT deposit in by AP set up and the MAC Address mapping relations table of the UGID that safeguards and MT in, portable terminal MT with identical UGID belongs to same group, has the identical network rights of using;
4) access point AP sets up and safeguards mapping relations between UGID and the wired VLAN ID VLAN ID, makes wireless VLAN related with wired VLAN foundation;
5) for the data between the portable terminal MT that inserts same AP, access point AP only transmits the data message between the portable terminal MT with identical UGID;
6) for the data that transmit between portable terminal MT and the cable network user, access point AP only transmits UGID and wired VLAN ID has the MT of mapping relations and the data between the cable network user;
When 7) portable terminal MT removed with current access point AP related, AP removed UGID, MAC Address and the VLAN ID mapping relations of this MT from the mapping relations table.
2. wireless local network according to claim 1 is based on the method for the VLAN of WAPI system, it is characterized in that said use standard has defined but untapped certificate field is represented user grouping identify label UGID and is meant attribute field or the extended field that uses certificate.
CNB2006101044322A 2006-07-31 2006-07-31 Method of Realizing Virtual Local Area Network Based on WAPI System in Wireless Local Area Network Active CN100369434C (en)

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