CN109510801B - Explicit forward proxy and SSL interception integrated system and operation method thereof - Google Patents
Explicit forward proxy and SSL interception integrated system and operation method thereof Download PDFInfo
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- CN109510801B CN109510801B CN201710832664.8A CN201710832664A CN109510801B CN 109510801 B CN109510801 B CN 109510801B CN 201710832664 A CN201710832664 A CN 201710832664A CN 109510801 B CN109510801 B CN 109510801B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/16—Implementing security features at a particular protocol layer
- H04L63/166—Implementing security features at a particular protocol layer at the transport layer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
Abstract
The application relates to an information transmission technology and discloses an explicit forward proxy and SSL interception integrated system and an operation method thereof. In the system of the application, the explicit forward proxy module is connected with the corresponding server in a TCP mode according to the request message sent by the client, and then the SSL interception module is in direct TCP communication with the client and the server after the connection is successful, so that the explicit forward proxy and SSL interception functions can be achieved through the same connection of the same equipment, extra networking is not needed, and configuration is simple.
Description
Technical Field
The invention relates to an information transmission technology, in particular to an explicit forward proxy and SSL interception integrated system and an operation method thereof.
Background
The existing server networking mode is complex and the performance is poor.
Disclosure of Invention
The invention aims to provide an explicit forward proxy and SSL interception integrated system and an operation method thereof, which are convenient for networking.
In order to solve the above technical problem, an embodiment of the present invention discloses an explicit forward proxy and SSL interception integrated system, which is characterized in that the system includes:
the explicit forward proxy module is used for establishing TCP connection with a corresponding server according to a request message received from a client; and
the SSL interception module is used for directly carrying out TCP communication with the client and the server after the explicit forward proxy module is successfully connected with the server;
the explicit forward proxy module and the SSL interception module are integrated in the same physical device or virtual machine.
The embodiment of the invention also discloses an operation method of the explicit forward proxy and SSL interception integrated system, which is characterized in that the system comprises an explicit forward proxy module and an SSL interception module, and the operation method comprises the following steps:
the explicit forward proxy module establishes TCP connection with a corresponding server according to a request message received from a client; and
the SSL interception module directly carries out TCP communication with the client and the server after the explicit forward proxy module is successfully connected with the server;
the explicit forward proxy module and the SSL interception module are integrated in the same physical device or virtual machine.
Compared with the prior art, the implementation mode of the invention has the main differences and the effects that:
in the application, the explicit forward proxy module is connected with a corresponding server in a TCP mode according to a request message sent by a client, and then the SSL interception module is directly communicated with the client and the server in the TCP mode after the connection is successful, so that the explicit forward proxy and SSL interception functions can be achieved through the same connection of the same equipment, extra networking is not needed, and the configuration is simple.
Furthermore, the subsequent message directly enters the SSL interception module and does not enter the explicit forward proxy module any more, so that the security of data transmission is ensured.
Drawings
Fig. 1 is a schematic structural diagram of an explicit forward proxy and SSL interception integrated system in a first embodiment of the present application.
Fig. 2 is a schematic flow chart of an explicit forward proxy and SSL interception integrated system in the first embodiment of the present application.
Fig. 3 is a networking structure diagram of an explicit forward proxy and SSL listening integrated system in the first embodiment of the present application.
Fig. 4 is a flowchart illustrating an operation method of an explicit forward proxy and SSL interception integrated system according to a second embodiment of the present application.
Detailed Description
In the following description, numerous technical details are set forth in order to provide a better understanding of the present application. However, it will be understood by those skilled in the art that the technical solutions claimed in the present application may be implemented without these technical details and without various changes and modifications based on the following embodiments.
It is to be understood that within the scope of the present invention, the above-described features of the present invention and those specifically described below (e.g., examples, embodiments) may be combined with each other to form new or preferred embodiments. For reasons of space, they will not be described in detail.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
A forward proxy generally refers to a service that sits between a client and an origin server, and in order to retrieve content from the origin server, the client sends a request to the proxy and specifies the target (origin server), and the proxy then forwards the request to the origin server and returns the retrieved content to the client. A secure Socket Layer ("SSL") is a protocol that supports services communicating over a network without compromising Security, creating a secure connection between a client and a server, and then securely sending any amount of data over that connection.
The inventor of the present invention finds that the SSL interception function and the explicit forward proxy function are two different services, and both of them need to receive and process messages, and therefore need to be configured on two different physical devices or two virtual machines. This configuration causes difficulties in server networking and the resulting performance is poor, and therefore needs to be adjusted.
The first embodiment of the application relates to an explicit forward proxy and SSL interception integrated system. Fig. 1 is a schematic structural diagram of an explicit forward proxy and SSL listening integrated system according to one embodiment. As shown in FIG. 1, the integrated explicit forward proxy and SSL snooping system comprises an explicit forward proxy module and an SSL snooping module.
The explicit forward proxy module is configured to establish a TCP (Transmission Control Protocol) connection with a corresponding server (i.e., a target server specified by the client) according to the request packet received from the client. In one embodiment, the explicit forward proxy module receives a request message from a client, sends a DNS query request to a DNS (Domain Name Server) Server according to the request message, and establishes a TCP connection with a Server corresponding to a DNS query result (including address information of a target Server) after receiving the DNS query result from the DNS Server.
The SSL interception module is used for directly carrying out TCP communication with the client and the server after the explicit forward proxy module is successfully connected with the server, namely, the explicit forward proxy module is switched to the SSL interception module to process the message of the client. In an embodiment, after the explicit forward proxy module is successfully connected with the server, the explicit forward proxy module does not receive subsequent messages from the client. The subsequent message of the client directly enters the SSL interception module and does not enter the explicit forward proxy module any more, so that the safety of data transmission is ensured.
When the client needs to access other servers, the client sends a new request message to the explicit forward proxy module, and the explicit forward proxy module and the SSL interception module establish TCP connection and TCP communication with other servers as described above, which is not described herein again.
Because the explicit forward proxy module and the SSL interception module sequentially process the messages of the client, the explicit forward proxy module and the SSL interception module may be integrated in the same physical device or virtual machine.
In the integrated system of the embodiment, the explicit forward proxy module is connected with the corresponding server in a TCP manner according to the request message sent by the client, and then the SSL interception module is directly communicated with the client and the server in a TCP manner after the connection is successful, so that the explicit forward proxy and SSL interception functions can be realized in the same connection of the same equipment, no additional networking is required, and the configuration is simpler.
In an embodiment, the explicit forward proxy module is configured to send an event to the SSL listening module after the explicit forward proxy module successfully connects with the server, so as to inform that the connection is successful. The SSL interception module is adapted to communicate TCP directly with the client and the server upon receiving the event from the explicit forward proxy module.
It is understood that in other embodiments of the present application, other ways may be adopted to switch from the explicit forward proxy module to the SSL listening module, for example, the SSL listening module periodically detects a state value stored somewhere, so long as the switching can be successfully implemented.
In another embodiment, the SSL interception module is configured to modify a callback function of a front-end TCP connection control block to a callback function of SSL after the forward proxy module is successfully connected to the server, so that the SSL interception module directly performs TCP communication with the client and the server, where the front-end TCP connection refers to connection with the client and the server, and the TCP connection control block is a block of data structure memory for describing TCP connection information.
It is to be understood that, in other embodiments of the present application, the message may also be sent to the loopback interface, and then the SSL listening module receives the message from the loopback interface, so that the SSL listening module processes the message, which is not limited to the above manner.
The operation method of the explicit forward proxy and SSL listening integrated system according to one embodiment will be described in detail below with reference to fig. 2. In fig. 2, the explicit forward proxy module and SSL listening module are integrated in the example proxy server. The operation method mainly comprises the following steps:
1. the client sends a request message to the proxy server.
2. And the proxy server analyzes the message after receiving the request message and sends a DNS searching request to the DNS server.
And 3, the DNS server sends the query result back to the proxy server.
4. And the proxy server establishes TCP connection with the server according to the DNS query result.
5. The server returns a TCP connection response message.
6. The proxy server forwards the TCP connection response message to the client.
7. If the connection between the proxy server and the server is successfully established, the explicit forward proxy module sends an event such as WEBAGENT _ HANDLE _ OVER to the SSL interception module, and the SSL interception module modifies the callback function of the front-end and back-end TCP connection control blocks into the callback function of the SSL after receiving the event.
8. The message sent by the client end directly enters the SSL interception module, and does not enter the explicit forward proxy module any more. The SSL interception module is responsible for encrypting and decrypting SSL traffic, linking with security devices (such as the firewall in fig. 3), and the like.
And 9, after the SSL interception module processes the message, forwarding the message to the server.
It is understood that the above-described operation method is only an example, and the steps may be modified, added and/or deleted, and still implement the technical solution of the present application.
FIG. 3 illustrates an example networking architecture for a proxy server. A plurality of clients 10 are connected via a route 20 to a proxy server 30 which is provided with one or more firewalls 40 and is connected to the internet 50, and a server 70 is connected to the internet 50 via a route 60. It can be seen that the networking structure is more concise because only one proxy server is needed to realize the above two functions.
The following is a specific example showing a forward proxy and SSL listening configuration.
[ explicit Forward proxy configuration ]
webagent service w1 172.16.2.5 8000
webagent link w1 vs-ssl1
[ SSL interception configuration ]
slb virtual tcps vs-ssl1 0.0.0.0 443noarp
slb real fwdip rs-ssl1 172.16.3.2 8443
slb group method g-ssl rr
slb group member g-ssl rs-ssl1
slb policy default vs-ssl1 g-ssl
slb virtual tcp vs-ssl2 0.0.0.0 8443noarp
slb virtual settings rts vs-ssl2
slb real tcps rs-ssl3 172.16.5.2 443
slb real settings keepdip rs-ssl3
slb policy static vs-ssl2 rs-ssl3
It should be noted that, all the modules mentioned in the device embodiments of the present application are logic modules, and physically, one logic module may be one physical module, or may be a part of one physical module, or may be implemented by a combination of multiple physical modules, where the physical implementation manner of the logic modules itself is not the most important, and the combination of the functions implemented by the logic modules is the key to solve the technical problem provided by the present invention. Furthermore, in order to highlight the innovative part of the present invention, the above-mentioned embodiments of the device of the present invention do not introduce modules which are not so closely related to solve the technical problems proposed by the present invention, which does not indicate that there are no other modules in the above-mentioned embodiments of the device.
The second embodiment of the invention relates to an operation method of an explicit forward proxy and SSL interception integrated system. Fig. 4 is a flowchart illustrating an operation method of the explicit forward proxy and SSL listening integrated system according to one embodiment. The integrated system comprises an explicit forward proxy module and an SSL interception integrated module. As shown in fig. 4, the operation method includes the steps of:
in step 401, the explicit forward proxy module establishes a TCP connection with a corresponding server according to a request message received from a client. In one embodiment, the forward proxy module is displayed to send a DNS query request to the DNS server according to a request message received from the client, and establish a TCP connection with a server corresponding to a DNS query result received from the DNS server.
Then, step 402 is entered, and the SSL interception module performs TCP communication directly with the client and the server after the explicit forward proxy module successfully connects with the server. In an embodiment, after the explicit forward proxy module is successfully connected with the server, the explicit forward proxy module does not receive subsequent messages from the client. The subsequent message of the client directly enters the SSL interception module and does not enter the explicit forward proxy module any more, so that the safety of data transmission is ensured.
When the client needs to access other servers, the client sends a new request message to the explicit forward proxy module, and the explicit forward proxy module and the SSL interception module establish TCP connection and TCP communication with other servers as described above, which is not described herein again.
The explicit forward proxy module and the SSL interception module are integrated in the same physical device or virtual machine.
In the method of the embodiment, the explicit forward proxy module is firstly connected with the corresponding server in a TCP mode according to the request message sent by the client, and then the SSL interception module is directly communicated with the client and the server in the TCP mode after the connection is successful, so that the explicit forward proxy and SSL interception functions can be realized in the same connection of the same equipment, extra networking is not needed, and the configuration is simple.
In one embodiment, in step 401, the explicit forward proxy module sends an event to the SSL listening module after the explicit forward proxy module successfully connects with the server. Then in step 402 the SSL listening module communicates TCP directly with the client and the server upon receiving the event from the explicit forward proxy module.
It is understood that in other embodiments of the present application, other ways may be adopted to switch from the explicit forward proxy module to the SSL listening module, for example, the SSL listening module periodically detects a state value stored somewhere, so long as the switching can be successfully implemented.
In another embodiment, in step 402, the SSL listening module modifies the callback function of the front-end TCP connection control block to the callback function of SSL after the explicit forward proxy module successfully connects to the server, so as to directly perform TCP communication with the client and the server.
It is to be understood that, in other embodiments of the present application, the message may also be sent to the loopback interface, and then the SSL listening module receives the message from the loopback interface, so that the SSL listening module processes the message, which is not limited to the above manner.
The first embodiment is a method embodiment corresponding to the present embodiment, and the present embodiment can be implemented in cooperation with the first embodiment. The related technical details mentioned in the first embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the first embodiment.
The method embodiments of the present invention may be implemented in software, hardware, firmware, etc. Whether the present invention is implemented as software, hardware, or firmware, the instruction code may be stored in any type of computer-accessible memory (e.g., permanent or modifiable, volatile or non-volatile, solid or non-solid, fixed or removable media, etc.). Also, the Memory may be, for example, Programmable Array Logic (PAL), Random Access Memory (RAM), Programmable Read Only Memory (PROM), Read-Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), a magnetic disk, an optical disk, a Digital Versatile Disk (DVD), or the like.
It is to be noted that in the claims and the description of the present patent, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, same element in a process, method, article, or apparatus that comprises the element.
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. An integrated explicit forward proxy and SSL snooping system, the system comprising: the explicit forward proxy module is used for establishing TCP connection with a corresponding server according to a request message received from a client;
the SSL interception module is used for directly carrying out TCP communication with the client and the server after the explicit forward proxy module is successfully connected with the server;
wherein, the explicit forward proxy module and the SSL interception module are integrated in the same physical device or virtual machine;
the SSL monitoring module is also used for encrypting and decrypting SSL flow and linking with the safety equipment; the explicit forward proxy module is used for sending an event to the SSL interception module after the explicit forward proxy module is successfully connected with the server;
and the SSL interception module is used for directly carrying out TCP communication with the client and the server after receiving the event from the explicit forward proxy module.
2. The integrated explicit forward proxy and SSL listening system according to claim 1, wherein the SSL listening module is configured to modify a callback function of a front-end TCP connection control block into a callback function of SSL after the explicit forward proxy module successfully connects to the server, so as to directly perform TCP communication with the client and the server.
3. The integrated system of claim 1, wherein the explicit forward proxy module is configured to send a DNS query request to a DNS server according to a request message received from a client, and establish a TCP connection with a server corresponding to a DNS query result received from the DNS server.
4. The integrated explicit forward proxy and SSL interception system according to any of claims 1 to 3, wherein the explicit forward proxy module does not receive any subsequent messages from the client after the explicit forward proxy module successfully connects with the server.
5. An operation method of an explicit forward proxy and SSL interception integrated system is characterized in that the system comprises an explicit forward proxy module and an SSL interception module, and the operation method comprises the following steps:
the explicit forward proxy module establishes TCP connection with a corresponding server according to a request message received from a client; and
the SSL interception module directly carries out TCP communication with the client and the server after the explicit forward proxy module is successfully connected with the server;
wherein, the explicit forward proxy module and the SSL interception module are integrated in the same physical device or virtual machine;
the SSL monitoring module is also used for encrypting and decrypting SSL flow and linking with the safety equipment; in the step of establishing TCP connection between the explicit forward proxy module and a corresponding server according to a request message received from a client, the explicit forward proxy module sends an event to the SSL interception module after the explicit forward proxy module is successfully connected with the server;
in the step of "the SSL interception module performs TCP communication directly with the client and the server after the explicit forward proxy module successfully connects with the server", the SSL interception module performs TCP communication directly with the client and the server after receiving the event from the explicit forward proxy module.
6. The method of claim 5, wherein in the step of "the SSL snooping module performs TCP communication directly with the client and the server after the explicit forward proxy module successfully connects to the server", the SSL snooping module modifies a callback function of a front-end and back-end TCP connection control block to a callback function of SSL after the explicit forward proxy module successfully connects to the server, thereby performing TCP communication directly with the client and the server.
7. The method of claim 5, wherein in the step of establishing the TCP connection with the corresponding server by the explicit forward proxy module according to the request message received from the client, the explicit forward proxy module sends a DNS query request to the DNS server according to the request message received from the client, and establishes the TCP connection with the server corresponding to the DNS query result received from the DNS server.
8. The method for operating the explicit forward proxy and SSL interception integrated system according to any of claims 5 to 7, wherein the explicit forward proxy module does not receive any subsequent message from the client after the explicit forward proxy module successfully connects with the server.
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