CN112887976B - VPN network automatic recovery system and method of intelligent terminal - Google Patents
VPN network automatic recovery system and method of intelligent terminal Download PDFInfo
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- CN112887976B CN112887976B CN201911202379.3A CN201911202379A CN112887976B CN 112887976 B CN112887976 B CN 112887976B CN 201911202379 A CN201911202379 A CN 201911202379A CN 112887976 B CN112887976 B CN 112887976B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/04—Arrangements for maintaining operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/08—Access security
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/19—Connection re-establishment
Abstract
The invention relates to a VPN network automatic recovery system and method of intelligent terminal, the system includes VPN communication protocol module, adding reconnection event module and reconnection action module at VPN client, adding VPN reconnection handshake protocol sub-module and VPN reconnection key negotiation protocol sub-module in VPN communication protocol module. The technical scheme of the invention can ensure that the network of the VPN can be automatically recovered after the signal of the wireless access is replied; when the network is switched, the network of the VPN can be automatically reestablished; after the intelligent terminal resumes from the sleep state, the network of the VPN can resume automatically.
Description
Technical Field
The invention relates to the field of network application delivery control, in particular to an automatic VPN network recovery system and method of an intelligent terminal.
Background
VPN, virtual private network, is a temporary, secure connection established through a public network (usually the internet) and is a secure, stable tunnel through a chaotic public network. In general, VPN is an extension to the intranet through which remote users, corporate branches, business partners and suppliers can be assisted in establishing trusted secure connections with the corporate intranet and ensuring secure transmission of data. VPN can be used for global internet access by growing mobile users to enable secure connections; virtual private lines that can be used to enable secure communications between enterprise web sites are used to economically and efficiently connect to secure extranet virtual private networks of business partners and users.
The mobile intelligent terminal accesses the Internet in a Wi-Fi or cellular base station (hereinafter referred to as a Cell) wireless mode, and then accesses the intranet of an enterprise through VPN is a development trend of the current technology. Compared with a wired access VPN, a wireless access VPN has the following problems: (1) the signal is unstable and strong and weak; (2) various forms of network switching often occur, such as from Wi-Fi to Cell, or from 3G to 4G of Cell, etc.; (3) the mobile intelligent terminal will disconnect the network signal when it is dormant. These features result in instability of the VPN network, thereby making it impossible for the mobile intelligent terminal user to access the intranet through the VPN network.
The main stream VPN at present is access to PC, which can not be directly used for solving the above 3 problems when VPN is accessed to enterprise intranet.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide a VPN network automatic recovery system based on the network type related to the intelligent terminal, in particular to: after the wireless access signal is recovered, the network of the VPN can be automatically recovered; when the network is switched, the network of the VPN can be automatically re-established; after the intelligent terminal resumes from the sleep state, the network of the VPN may resume automatically.
The VPN network automatic recovery system of the intelligent terminal comprises a VPN communication protocol module, wherein a reconnection event module and a reconnection action module are added at a VPN client, and at least 2 sub-modules are added in the VPN communication protocol module:
the submodule 1, VPN reconnection handshake protocol submodule, the module protocol is initiated by the customer end, after receiving the module protocol, the service end identifies whether it is the established Client, if not, it is ignored; if yes, releasing the previous connection and establishing a new VPN connection; and
The reconnection event module is used for monitoring any event needing to generate reconnection action of the VPN client; the reconnection event comprises the switching from the non-network connection to the Cell network connection, the non-network connection to the WIFI network connection, the switching from the WIFI network to the Cell network, the switching from the Cell network to the WIFI network and the switching from one WIFI network to another WIFI network.
The re-acting module stores three network settings: when not connected, setting a network before reconnection and setting a network after reconnection, wherein the module is responsible for completing the recovery of the VPN network by cooperation of the VPN client and the VPN server after the reconnection event is generated; and then setting the network environment of the client according to the reconnection result.
The network environment setting of the client comprises network setting when not connected, network setting before reconnection and network setting after reconnection; if the VPN reconnection handshake protocol fails, recovering to the network setting when not connected; and if the reconnection is successful, restoring to the network setting after the reconnection.
The VPN network automatic recovery method of the intelligent terminal comprises the following steps: the VPN client receives the reconnection event and performs reconnection action, the VPN server executes VPN reconnection handshake protocol, and the VPN client cooperates with the server to complete recovery of the VPN network; wherein, the VPN reconnection handshake protocol is realized by the following steps:
step one, the VPN re-connection handshake protocol adopts a double tunnel mode: SSL/TCP encryption tunnel mode and UDP encryption tunnel mode;
step two, the SSL/TCP tunnel completes key negotiation through standard TLS1.2 protocol handshake, and completes authentication and authorization of users and devices in the SSL tunnel; negotiating a shared key at two ends of a UDP encryption tunnel in the SSL tunnel after authentication and authorization;
step three, any message sent by the UDP tunnel is encrypted by the shared secret key.
The VPN reconnection handshake protocol may further include the steps of:
step four, when the UDP tunnel is abnormal, the client breaks the current UDP tunnel, renegotiates the shared key of one UDP tunnel, and newly builds the UDP tunnel;
fifthly, the UDP tunnel is normally transmitted through the SSL tunnel from abnormality to new creation completion;
and step six, stopping VPN service when the SSL tunnel has a problem.
In the second step, the SSL/TCP tunnel can also handshake through the national secret SM2v1.1 protocol and complete key negotiation.
In the fourth step, renegotiation of the shared key of a UDP tunnel is accomplished through SSL tunnel timing.
If the VPN reconnection handshake protocol fails, recovering to the network setting when not connected; and if the reconnection is successful, restoring to the network setting after the reconnection.
The VPN network automatic recovery system and the VPN network automatic recovery method of the intelligent terminal can ensure that the VPN network can be automatically recovered after the wireless access signal is recovered; when the network is switched, the network of the VPN can be automatically reestablished; after the intelligent terminal resumes from the sleep state, the network of the VPN can resume automatically.
Drawings
FIG. 1 is a schematic diagram of a system architecture of the present invention;
FIG. 2 is a schematic diagram of a workflow of a VPN re-connection handshake protocol module according to the present invention;
FIG. 3 is a schematic diagram of a reconnection event module workflow according to the present invention;
FIG. 4 is a schematic diagram of the workflow of the heavy duty operation module according to the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be understood by those skilled in the art that the present invention may be practiced without these specific details and with various changes and modifications from the embodiments that follow.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, the system of the present invention adds a network automatic recovery function in the VPN access procedure. The function consists of three modules: a VPN reconnection handshake protocol module 201, a reconnection event module 101 and a reconnection action module 102. Wherein: the VPN reconnection handshake protocol module is installed in the VPN server 200, the reconnection event module and the reconnection action module are installed in the VPN client 100, and the server cooperates with the client to complete automatic network recovery.
The VPN reconnection handshake protocol module is an expansion of the existing VPN protocol and is used for supporting VPN automatic reconnection work, the work flow is shown in figure 2, and the work flow comprises at least two protocols added on the basis of the VPN communication protocol:
VPN reconnection handshake protocol: the protocol is initiated by the Client, and after the server receives the protocol, the server identifies whether the protocol is the established Client, if not, the protocol is ignored; if yes, releasing the previous connection and establishing a new VPN connection; and
VPN reconnection key agreement protocol: after the new VPN connection is established, the symmetric encryption keys of both VPN parties are updated.
The reconnection event module is responsible for monitoring any event needing to generate reconnection actions;
the re-acting module stores three network settings: when not connected, setting a network before reconnection and setting a network after reconnection, wherein the module is responsible for completing the recovery of the VPN network by cooperation of the VPN client and the VPN server after the reconnection event is generated; and then setting the network environment of the client according to the reconnection result.
The VPN network automatic recovery method of the intelligent terminal comprises the following steps: the VPN client receives the reconnection event and performs reconnection action, the VPN server executes VPN reconnection handshake protocol, and the VPN client cooperates with the server to complete recovery of the VPN network; wherein, the VPN reconnection handshake protocol is realized by the following steps:
step one, the VPN re-connection handshake protocol adopts a double tunnel mode: SSL/TCP encryption tunnel and UDP encryption tunnel;
step two, the SSL/TCP tunnel completes key negotiation through standard TLS1.2 protocol handshake, and completes authentication and authorization of users and devices in the SSL tunnel; negotiating a shared key at two ends of a UDP encryption tunnel in the SSL tunnel after authentication and authorization;
step three, any message sent by the UDP tunnel is encrypted by a shared key;
step four, when the UDP tunnel is abnormal, the client breaks the current UDP tunnel, renegotiates the shared key of one UDP tunnel, and newly builds the UDP tunnel;
fifthly, the UDP tunnel is normally transmitted through the SSL tunnel from abnormality to new creation completion;
and step six, stopping VPN service when the SSL tunnel has a problem.
The SSL/TCP tunnel may also handshake and complete key negotiation via the national secret sm2v1.1 protocol.
The renegotiation of the shared key of a UDP tunnel is accomplished through SSL tunnel timing.
If the VPN reconnection handshake protocol fails, recovering to network setting when not connected; and if the reconnection is successful, restoring to the network setting after the reconnection.
The reconnection event module is configured to monitor any event that needs to generate a reconnection action at the VPN client: when the VPN enters the unconnected state, the VPN is restored or switched into the VPN connection state through triggering of a reconnection event of the VPN client.
The mobile intelligent terminal accesses the Internet in a wireless mode through Wi-Fi or a cellular base station, and then accesses the intranet of an enterprise through VPN. The three characteristics of the wireless access are: (1) the signals are unstable and strong and weak, and network restoration reconnection is needed frequently; (2) various forms of network switch reconnection often occur, such as from Wi-Fi to Cell, or Cell network forms switch between 3G, 4G, 5G; (3) when the intelligent terminal is dormant, network signals are disconnected, and the network needs to be dormant, restored and reconnected.
As shown in fig. 3, the wireless access mode of the mobile intelligent terminal generally has three VPN connection states and two types of network reconnection events, and the three characteristics are correspondingly converted into the three VPN connection states and the two types of network events. The three VPN connection states include: the unconnected state (including dormancy), the WIFI connected state, and the Cell connected state, the two types of network events include a network resume event and a network switch event, where the network resume event includes a dormancy to wake event, so that there is no need to define a dormancy resume event. The reconnection event comprises a network unconnected event, a WIFI connection event, a Cell connection event, a network recovery event and a network switching event.
And when the VPN is disconnected or the intelligent terminal is dormant, entering an unconnected state. Thereafter, other states may be entered by two types of network event triggers, such as:
state 1: in the current unconnected state, a network recovery event is received, a new network is connected with the Cell, and reconnection is performed; after success, the Cell connection state is entered.
State 2: in the current unconnected state, a network recovery event is received, and the new network is WIFI connected, so as to perform reconnection; and after success, entering a WIFI connection state.
State 3: currently, the WIFI is connected, a network switching event is received, a new network is connected by a Cell, and reconnection is performed; after success, the Cell connection state is entered.
State 4: the current Cell connection state is that a network switching event is received, a new network is WIFI connection, and reconnection is carried out; and after success, entering a WIFI connection state.
State 5: the current Cell connection state is that a network switching event is received, a new network is connected by different WIFI, and reconnection is carried out; and after success, entering a WIFI connection state.
The heavy action module is as follows: when the reconnection action needs to occur, the VPN client needs to complete a reconnection protocol with the VPN server, and then the network environment of the client is set according to the reconnection result.
As shown in fig. 4, the re-association module typically needs to save three network settings: network settings when unconnected, pre-reconnection network settings, post-reconnection network settings (from VPN reconnection protocol). If the reconnection protocol fails, the network setup is restored to the unconnected state. And if the reconnection is successful, restoring to the network setting after the reconnection.
It should be noted that, in the embodiments of the present invention, each unit mentioned in each device is a logic unit, and in physical aspect, one logic unit may be a physical unit, or may be a part of one physical unit, or may be implemented by a combination of multiple physical units, where the physical implementation manner of the logic units is not the most important, and the combination of functions implemented by the logic units is a key for solving the technical problem posed by the present invention. Furthermore, in order to highlight the innovative part of the present invention, the present invention does not introduce the above-described device embodiments and units less closely related to solving the technical problems posed by the present invention, but this does not indicate the absence of the above-described device embodiments and other related implementation units.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (8)
1. The VPN network automatic recovery system of the intelligent terminal comprises a VPN communication protocol module, wherein a reconnection event module and a reconnection action module are added to a VPN client, and the VPN communication protocol module is characterized in that the reconnection event module is used for monitoring any event needing to generate reconnection action of the VPN client; the reconnection operation module is responsible for completing the recovery of the VPN network by cooperation of the VPN client and the VPN server after the reconnection event;
the VPN communication protocol module is added with at least 2 sub-modules:
1.1, vpn reconnection handshake protocol submodule: the module protocol is initiated by the Client, and after the server receives the module protocol, the server identifies whether the Client is a Client already established, if not, the Client is ignored; if yes, releasing the previous connection and establishing a new VPN connection; and
1.2, vpn reconnection key agreement protocol submodule: after the new VPN connection is established, the symmetric encryption keys of the two VPN parties are updated;
the process of automatically recovering the VPN network is realized as follows: the VPN client receives the reconnection event and performs reconnection action, the VPN server executes VPN reconnection handshake protocol, and the VPN client cooperates with the server to complete recovery of the VPN network; wherein, the VPN reconnection handshake protocol is realized by the following steps:
step one, the VPN re-connection handshake protocol adopts a double tunnel mode: SSL/TCP encryption tunnel and UDP encryption tunnel;
step two, the SSL/TCP tunnel completes key negotiation through standard TLS1.2 protocol handshake, and completes authentication and authorization of users and devices in the SSL tunnel; negotiating a shared key at two ends of a UDP encryption tunnel in the SSL tunnel after authentication and authorization;
step three, any message sent by the UDP tunnel is encrypted by a shared key;
step four, when the UDP tunnel is abnormal, the client breaks the current UDP tunnel, renegotiates the shared key of one UDP tunnel, and newly builds the UDP tunnel;
fifthly, the UDP tunnel is normally transmitted through the SSL tunnel from abnormality to new creation completion;
and step six, stopping VPN service when the SSL tunnel has a problem.
2. The VPN automatic recovery system for an intelligent terminal according to claim 1, wherein,
the re-acting module stores three network settings: when the VPN is not connected, the network is set before reconnection and the network is set after reconnection, and the module is responsible for setting the network environment of the client according to the reconnection result after the VPN client and the VPN server cooperate to complete the recovery of the VPN.
3. The VPN automatic recovery system for an intelligent terminal according to claim 1, wherein the reconnection event includes a connection from no network to a Cell network, a connection from no network to a WIFI network, a switch from a WIFI network to a Cell network, a switch from a Cell network to a WIFI network, and a switch from one WIFI network to another WIFI network.
4. The VPN automatic recovery system according to claim 1 or 2, wherein the network environment setting of the client includes an unconnected network setting, a pre-reconnection network setting, and a post-reconnection network setting; if the VPN reconnection handshake protocol fails, recovering to the network setting when not connected; and if the reconnection is successful, restoring to the network setting after the reconnection.
5. The VPN network automatic recovery method of the intelligent terminal is characterized by comprising the following steps of: the VPN client receives the reconnection event and performs reconnection action, the VPN server executes VPN reconnection handshake protocol, and the VPN client cooperates with the server to complete recovery of the VPN network; wherein, the VPN reconnection handshake protocol is realized by the following steps:
step one, the VPN re-connection handshake protocol adopts a double tunnel mode: SSL/TCP encryption tunnel and UDP encryption tunnel;
step two, the SSL/TCP tunnel completes key negotiation through standard TLS1.2 protocol handshake, and completes authentication and authorization of users and devices in the SSL tunnel; negotiating a shared key at two ends of a UDP encryption tunnel in the SSL tunnel after authentication and authorization;
step three, any message sent by the UDP tunnel is encrypted by a shared key;
step four, when the UDP tunnel is abnormal, the client breaks the current UDP tunnel, renegotiates the shared key of one UDP tunnel, and newly builds the UDP tunnel;
fifthly, the UDP tunnel is normally transmitted through the SSL tunnel from abnormality to new creation completion;
and step six, stopping VPN service when the SSL tunnel has a problem.
6. The method for automatically recovering the VPN network of the intelligent terminal according to claim 5, wherein the SSL/TCP tunnel in step two may handshake through the national secret sm2v1.1 protocol and complete key negotiation.
7. The method for automatically recovering a VPN network of an intelligent terminal according to claim 5, wherein renegotiating a shared key of a UDP tunnel in step four is accomplished by SSL tunnel timing.
8. The VPN automatic restoration method for an intelligent terminal according to any one of claims 5 to 7, characterized in that if the VPN reconnection handshake protocol fails, restoration to the network setting at the time of unconnected; and if the reconnection is successful, restoring to the network setting after the reconnection.
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