Transmission control system, server, terminal station, transmission control method, program and storage medium

• US 20030154296A1
• Filed: 05/31/2002
• Published: 08/14/2003
• Est. Priority Date: 02/08/2002
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Noguchi, Tetsuya, Seki, Naishin
• Granted Patent: US 7,565,687 B2
• Time in Patent Office: Days
• US Class Current: 709/229
• CPC Class Codes: H04L 63/0236 Filtering by address, protocol, port number or service, e.g. IP-address or URL
• CPC Class Codes: H04L 63/0245 Filtering by information in the payload
• CPC Class Codes: H04L 63/0281 Proxies
• CPC Class Codes: H04L 67/02 based on web technology, e.g. hypertext transfer protocol [HTTP]

Abstract

A transmission control system comprises a restricted word database for storing restricted words; a request transmission control section for relaying a request message sent from a Web browser to an external network and inspecting whether the request message includes a code that is dependent on an HTML file; and a restricted word checking section for analyzing the code using related portions of the code described in the HTML file when the request message includes the code, and determining whether or not to allow transmission of the request message depending on whether an analysis result of the code corresponds to the restricted words, wherein the request transmission control section controls the transmission of the request message according to the determination of the restricted word checking section.

Claims

1. A transmission control system comprising:

a restricted word database adapted to store restricted words that are used to restrict transmission;

a request transmission control section adapted to relay a request message sent from a Web browser to an external network and inspecting whether the request message includes a code that is dependent on a source file of a Web page displayed on the Web browser; and

a restricted word checking section adapted to analyze the code using related portions of the code described in the source file when the request message includes the code, and to determine whether or not to allow transmission of the request message depending on whether an analysis result of the code corresponds to one or more of the restricted words stored in the restricted word database,

wherein the request transmission control section controls the transmission of the request message according to the determination of the restricted word checking section.

2. The transmission control system according to claim 1, further comprising:

an information database adapted to store information about corresponding relations between the code from the source file of the Web page displayed in the Web browser and attribute values of the code, wherein the restricted word checking section analyzes the code based on information about the corresponding relations stored in the corresponding information database.

3. The transmission control system according to claim 2, further comprising:

a response file analysis section adapted to acquire a source file of a Web page sent back from a predetermined server responsive to a request from the Web browser, and to extract corresponding relations between the code in the source file and attribute values of the code and storing in the corresponding information database.

4. The transmission control system according to claim 1, further comprising:

a login management section adapted to specify a user who has logged into the Web browser, wherein the restricted word database stores the restricted words for each user who uses the Web browser, and wherein the restricted word checking section acquires information about the restricted words set for a user by the login management section from the restricted word database and matches the information with the analysis result of the code.

5. The transmission control system according to claim 1, wherein the restricted word database stores the restricted words depending on a destination of the request message, and wherein the restricted word checking section acquires information about the restricted words, corresponding to the destination of the request message sent from the Web browser, from the restricted word database and matches the information with the analysis result of the code.

6. The transmission control system according to claim 1, wherein the restricted word database stores plural kinds of the restricted words that correspond to time zones, and wherein the restricted word checking section acquires information about corresponding restricted words from the restricted word database depending on the time zone in which the request message is sent from the Web page, and matches the information with the analysis result of the code.

7. The transmission control system according to claim 1 wherein the transmission control system is implemented as part of a server.

8. The transmission control system according to claim 7, further comprising:

a corresponding information database adapted to store information about corresponding relations between the code from the source file of the contents and attribute values of the code; and

a response file analysis section adapted to acquire a source file of a Web page sent back from a predetermined server responsive to a request from the client machine, and to extract corresponding relations between the code in the source file and attribute values of the Code and storing in the corresponding information database,

wherein the restricted word checking section analyzes the code based on information about the corresponding relations stored in the corresponding information database.

9. The transmission control system according to claim 7, further comprising:

a login management section adapted to specify a user who has sent the request message from the client machine; and

a restricted word database adapted to store the restricted words that are set individually for each user who uses the client machine,

wherein the restricted word checking section acquires information about the restricted words set for a user specified by the login management section from the restricted word database and matches the information with the analysis result of the code.

10. A terminal station connected to an external network and equipped with a means to display Web pages, the terminal station comprising:

request message analysis means for inspecting whether a request message generated according to a form of the Web page includes a code that is dependent on a source file of the Web page; and

request message transmission control means for analyzing the code using related portions of the code described in the source file when the request message includes the code, and controlling transmission of the request message depending on whether an analysis result of the code corresponds to control information that is set to restrict the transmission.

11. The terminal station according to claim 10, further comprising:

sender specifying means for specifying a sender of the request message, wherein the request message transmission control means controls the transmission of the request message based on the restricted information that is set for the specified sender among the restricted information set for each user of the terminal station.

12. A transmission control method of a request message generated according to a form of a Web page, the method comprising the steps of:

inspecting whether the request message includes a code that is dependent on a source file of the Web page;

analyzing the code using related portions of the code described in the source file when the request message includes the code; and

determining whether or not to allow transmission of the request message depending on whether an analysis result of the code corresponds to restricted information that is used to restrict the transmission.

13. The transmission control method according to claim 12, further comprising the step of specifying a sender of the request message, wherein the step of determining whether or not to allow transmission comprises the step of inspecting whether an analysis result of the code corresponds to the restricted information set for the specified sender.

14. The transmission control method according to claim 12, wherein the restricted information is set individually depending on a destination of the request message, wherein the step of determining whether or not to allow transmission comprises the steps of:

extracting information about the destination of the request message; and

inspecting whether an analysis result of the code corresponds to the restricted information set for the extracted destination.

15. The transmission control method according to claim 12, wherein the restricted information is a length of character strings, and wherein the step of determining whether or not to allow transmission comprises the step of comparing a length of a character string of an analysis result of the code with a length specified by the restricted information to determine whether or not to allow transmission of the request message.

16. The transmission control method according to claim 12, wherein the restricted information is a numeric value, wherein the step of determining whether or not to allow transmission comprises the step of comparing information about a number in an analysis result of the code with a numeric value specified by the restricted information to determine whether or not to allow transmission of the request message.

17. The transmission control method of claim 12 wherein the request is a HyperText Transmission Protocol (HTTP) request the source file is a HyperText Markup Language (HTML) file.

18. A program for causing a computer connected to an external network to perform the functions of:

relaying a request message sent from a Web browser to an external network and inspecting whether the request message includes a code that is dependent on a source file of a Web page displayed on the Web browser;

analyzing the code using related portions of the code described in the source file when the request message includes the code; and

controlling transmission of the request message depending on whether an analysis result of the code corresponds to restricted information that is set to restrict the transmission.

19. A storage medium for storing a computer-readable program executable by a computer, the program causing the computer to perform the functions of:

relaying a request message sent from a Web browser to an external network and inspecting whether the request message includes a code that is dependent on a source file of a Web page displayed on the Web browser;

analyzing the code using related portions of the code described in the source file when the request message includes the code; and

controlling transmission of the request message depending on whether an analysis result of the code corresponds to restricted information that is set to restrict the transmission.