JP6409439B2 - Image forming apparatus and program - Google Patents

Description

  The present invention relates to an image forming apparatus and a program.

  2. Description of the Related Art Conventionally, in an image forming apparatus having a printer function and a scanner function, scanned data (document data, etc.) is stored in an internal storage unit in a file format, and the stored file is stored in another terminal device via a communication network. An image forming apparatus for transmission is used. In such an image forming apparatus, for example, Patent Document 1 discloses a technique for preventing unauthorized access to a file stored in a storage unit (data storage unit). The technique described in Patent Document 1 determines whether or not document data can be transmitted based on whether or not the security of the document data to be transmitted is set.

JP 2006-82491 A

  On the other hand, in recent years, an image forming apparatus that can be connected to a plurality of communication networks has been proposed. When such an image forming apparatus is connected to a communication network with a low security level, for example, the risk of unauthorized access to the file increases. For example, when a file having a right to access a data storage unit of an image forming apparatus is transmitted to a user terminal of the user via a communication network with a low security level, the file is connected to the communication network. There is a possibility that the file may be illegally acquired by a user of another terminal device.

  An object of the present invention is to provide an image forming apparatus and program capable of preventing unauthorized access to a file stored in a data storage unit in an image forming apparatus connectable to a plurality of communication networks.

  According to a first aspect of the present invention, an image forming apparatus includes: a communication interface; a network type determination unit that determines a type of a communication network connected to the communication interface; and at least the communication network based on the type of the communication network Access restriction means for restricting access to a file stored in a data storage unit of the image forming apparatus via the communication interface connected to the image forming apparatus.

  According to a second aspect of the present invention, in the configuration according to the first aspect, the access restricting unit is connected to the communication network when the communication network is a predetermined communication network. Access to the file stored in the data storage unit via the communication interface is restricted.

  According to a third aspect of the present invention, in the configuration according to the first aspect, the access restriction unit includes the type of the communication network and the communication interface connected to the communication network. Access to the file is restricted based on the operation content for the file stored in the data storage unit.

  In an image forming apparatus according to a fourth aspect of the present invention, in the configuration according to the first aspect, the access restriction unit is connected to the communication network when the communication network is a predetermined communication network. Predetermined operations on the file stored in the data storage unit via the communication interface are prohibited.

  An image forming apparatus according to a fifth aspect of the present invention, in the configuration according to the first aspect, determines a communication method between the communication interface and a device connected to the communication interface via the communication network. The access restriction unit further includes a communication method determination unit, and the access restriction unit is stored in the data storage unit via the communication interface connected to the communication network based on the type of the communication network and the communication method. Restrict access to files.

  According to a sixth aspect of the present invention, in the configuration according to the first aspect, the communication method determination unit determines whether the communication method is encrypted communication or non-encrypted communication.

  According to a seventh aspect of the present invention, in the image forming apparatus according to the fifth or sixth aspect, the file is stored in the data storage unit according to a combination of the type of the communication network and the communication method. Security level deciding means for deciding a security level with respect to access of the network, wherein the access restriction means is stored in the data storage unit via the communication interface connected to the communication network based on the security level. Restrict access to the file.

  An image forming apparatus according to an eighth aspect of the present invention is the configuration according to the first aspect, wherein the communication interface includes a first communication interface and a second communication interface, and the communication network includes an intranet and the Internet, The first communication interface is connected to the intranet, and the second communication interface is connected to the Internet.

  According to a ninth aspect of the present invention, there is provided a program based on a network type determination unit that determines a type of a communication network connected to a communication interface provided in the image forming apparatus, and at least the type of the communication network. A program for causing a computer to function as an access restriction unit that restricts access to a file stored in a data storage unit of the image forming apparatus via the communication interface connected to a network. This program may be stored in a computer-readable information storage medium such as a CD-ROM or a DVD-ROM.

  According to the first and ninth aspects of the present invention, in an image forming apparatus that can be connected to a plurality of communication networks, unauthorized access to a file stored in a data storage unit is prevented.

  According to the configuration of claim 2 of the present invention, when the communication network is a predetermined communication network, access to the file is restricted via a communication interface connected to the communication network.

  According to the configuration of the third aspect of the present invention, access to the file is restricted based on the type of the communication network and the operation content for the file.

  According to the configuration of claim 4 of the present invention, a predetermined operation on the file is prohibited.

  According to the configuration of the fifth aspect of the present invention, access to the file via the communication interface connected to the communication network is restricted based on the type and communication method of the communication network.

  According to the configuration of claim 6 of the present invention, it is determined whether the communication method is encrypted communication or non-encrypted communication.

  According to the configuration of the seventh aspect of the present invention, access to the file is restricted based on the security level.

  According to the configuration of claim 8 of the present invention, the first communication interface is connected to the intranet, and the second communication interface is connected to the Internet.

1 is an overall configuration diagram of an image forming system according to an exemplary embodiment. 2 is a functional block diagram of an image forming apparatus according to Configuration Example 1. FIG. It is a schematic diagram which shows the structure of a data storage part. It is a table which shows an example of the information registered into terminal information DB. It is a table which shows the other example of the information registered into terminal information DB. It is a table which shows an example of the user information registered into user information DB. It is a table which shows the availability of the operation memorize | stored in access restriction information DB. 6 is an operation flowchart of the image forming apparatus according to Configuration Example 1. FIG. 6 is a functional block diagram of an image forming apparatus according to Configuration Example 2. FIG. It is a table which shows the availability of the operation memorize | stored in access restriction information DB. FIG. 10 is an operation flowchart of the image forming apparatus according to Configuration Example 2.

  An embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 is an overall configuration diagram of an image forming system according to the present embodiment. As shown in FIG. 1, the image forming system 100 includes an image forming apparatus 10 and a user terminal 20 possessed by the user. Although the number of user terminals 20 is not limited, two user terminals 20a and 20b are shown here for convenience. The image forming apparatus 10 and the user terminal 20a are connected to each other via the first communication network 30a, and the image forming apparatus 10 and the user terminal 20b are connected to each other via the second communication network 30b. Hereinafter, the function common to the user terminals 20a and 20b is referred to as the user terminal 20, and the function common to the communication networks 30a and 30b is referred to as the communication network 30. The first communication network 30a and the second communication network 30b are independent networks, and are not connected to each other. Further, here, the first communication network 30a is a communication network having a relatively high security level (secure), and the second communication network 30b is a communication network having a relatively low security level (non-secure). Assume that there is. A communication network with a high security level is, for example, an intranet, and a communication network with a low security level is, for example, the Internet. The intranet is a network constructed to be usable in a local area, for example, and the Internet is a network constructed to be usable by the public, for example.

  The user terminal 20 is a terminal device that is connected to the communication network 30 and used by the user. The user terminal 20 performs data communication with the image forming apparatus 10 via the communication network 30 based on a user operation. Thereby, for example, the user terminal 20 transmits a print command corresponding to a user operation to the image forming apparatus 10 or acquires image data (for example, scan data) read by the image forming apparatus 10. The user terminal 20 includes software such as a browser and an e-mail client. The user terminal 20 is, for example, a personal computer, a PDA (Personal Digital Assistant), a portable information terminal such as a smartphone, or the like.

  The image forming apparatus 10 has general multifunction peripheral functions such as a copy function, a FAX function, and a scanner function. The image forming apparatus according to the present embodiment may be an apparatus having at least any one of the above functions. Since these functions are well-known structures, description thereof is omitted.

  FIG. 1 also shows the hardware configuration of the image forming apparatus 10. The image forming apparatus 10 includes a control unit 101, a display unit 102, an input unit 103, a storage unit 104, a reading unit 105, a data storage unit 106, an output unit 107, and a communication unit 108. The image forming apparatus 10 may include an operation unit, a power switch, and the like. The control unit 101 includes a CPU (Central Processing Unit), executes various arithmetic processes based on a program stored in the storage unit 104, and controls each unit of the image forming apparatus 10. Details of the control unit 101 will be described later.

  The display unit 102 is configured by a display device such as a liquid crystal display, and displays information processing results and the like by the control unit 101. The input unit 103 includes an input device such as a touch panel and button keys, and receives an operation input from a user. The storage unit 104 is an information recording medium that includes an information recording medium such as a ROM, a RAM, and a hard disk and holds a program executed by the control unit 101. The storage unit 104 also operates as a work memory of the control unit 101, for example. Note that various memories can be applied as the storage unit 104. For example, the storage unit 104 may be realized by a storage device such as a semiconductor memory. In addition, the program and various data described as being stored in the storage unit 104 in this embodiment may be acquired from an external device via the communication unit 108 or may be acquired from an external storage medium. It may be. The storage unit 104 may be provided outside the image forming apparatus 10.

  The reading unit 105 is configured by a scanner or the like. The reading unit 105 reads an image of an object by optically scanning the object such as paper.

  The data storage unit 106 stores electronic data (image data) of the image read by the reading unit 105 in a file format. Similar to the storage unit 104, the data storage unit 106 is configured by an information recording medium such as a ROM, a RAM, or a hard disk. The data storage unit 106 may be included in the storage unit 104. In addition to files generated by functions of the image forming apparatus 10 such as scanned image data and copy image data, the file here is input to the image forming apparatus 10 from the outside (user terminal 20) via the communication network 30. Included files are also included.

  The output unit 107 includes a printing unit for forming an image on a medium such as paper. For example, when the user performs a print instruction operation, the output unit 107 prints (outputs) image data or the like on a paper medium based on the processing of the control unit 101.

  The communication unit 108 includes a plurality of communication interfaces and performs data communication with the user terminal 20 connected to the image forming apparatus 10. For example, the communication unit 108 includes a first communication interface 108a and a second communication interface 108b. Each communication interface is configured by, for example, a NIC (Network Interface Card) or the like. FIG. 1 shows a case where the communication unit 108 includes two communication interfaces 108a and 108b. However, the number of communication interfaces included in the communication unit 108 is not limited to two, and is three or more. May be. Each communication interface included in the communication unit 108 may be a physical interface or a logical interface.

  Here, it is assumed that the first communication interface 108a is connected to the first communication network 30a (for example, an intranet), and the second communication interface 108b is connected to the second communication network 30b (for example, the Internet).

  FIG. 2 is a functional block diagram of the image forming apparatus 10 according to the first configuration example. As shown in FIG. 2, the control unit 101 functionally includes a data acquisition unit 201, an access reception unit 202, a network type determination unit 203, an access authority determination unit 204, a user authentication unit 205, an access restriction unit 206, and The data transmission unit 207 is included. Each of these functions is realized by executing a program stored in the storage unit 104 by the control unit 101. The storage unit 104 includes a terminal information database (terminal information DB) 208, a user information database (user information DB) 209, and an access restriction information database (access restriction information DB) 210.

  The data acquisition unit 201 acquires image data of an image read by the reading unit 105 and data input to the image forming apparatus 10 from the user terminal 20 via the communication network 30. Hereinafter, image data read by the scanner function will be described as an example. The data acquisition unit 201 stores the acquired image data in a file format in the data storage unit 106. The file is stored in the data storage unit 106 in association with attribute information such as file creation date / time (scan execution date / time), identification information (file ID), file name, file size, and number of pages. Further, when the image forming apparatus 10 has a function of performing user authentication when receiving a scanning operation, identification information (user ID) of a user who has performed the scanning operation may be associated with the file. The data storage unit 106 accumulates image data in time series.

  The access receiving unit 202 receives access to the data storage unit 106 from the user terminal 20. Specifically, for example, when a user who has performed a scanning operation on the image forming apparatus 10 acquires (downloads) scanned image data (file) from the image forming apparatus 10, the user terminal 20 stores the file storage destination. The data storage unit 106 is selected. The access receiving unit 202 receives a selection operation (access) to the data storage unit 106 by the user. The access receiving unit 202 acquires identification information (for example, IP address) of the accessed user terminal 20 and identifies the user terminal 20.

  Here, the data storage unit 106 may include a plurality of data storage areas (folders). FIG. 3 is a schematic diagram showing the configuration of the data storage unit 106. Each data storage area is configured to store a plurality of files. Each data storage area may be associated with one or a plurality of user terminals 20. For example, the data storage area A may be associated with the user terminals 20c to 20e, and the data storage area B may be associated with the user terminals 20f to 20h. In this case, only the user terminals 20c to 20e can access the data storage area A, and only the user terminals 20f to 20h can access the data storage area B. . Each data storage area may be configured to be able to set authentication information (password).

  The network type determination unit 203 determines which of the first communication network 30a and the second communication network 30b is used to access the data storage unit 106 from the user terminal 20. Specifically, when the access is received through the first communication interface 108a, the network type determination unit 203 determines that the access has been performed through the first communication network 30a. In addition, when the access is received via the second communication interface 108b, the network type determination unit 203 determines that the access is made via the second communication network 30b.

  In the present embodiment, the first communication interface 108a is connected to a high security level (secure) communication network (for example, an intranet), and the second communication interface 108b is a low security level (non-secure) communication network (for example, an intranet). The communication network connected to the first communication interface 108a and the second communication interface 108b is a secure communication network or a non-secure communication network. It can be determined by a known method shown below.

  For example, if the network type determination unit 203 performs a connection test (for example, a connection test using Ping) to determine whether the communication interface can connect to a specific communication destination on the Internet, and if this connection test is successful, the network type The determination unit 203 determines that the type of communication network connected to the communication interface is the Internet. In addition, the network type determination unit 203 performs a connection test as to whether or not the communication interface can be connected to a specific communication destination on the intranet. If this connection test is successful, the network type determination unit 203 The type of the communication network connected to is determined as an intranet. The network type determination unit 203 may determine the type of a communication network connected to the communication interface based on the IP address assigned to the communication interface. The IP address is assigned by a DHCP server (not shown) connected via a communication network (Internet or intranet).

  The access authority determination unit 204 refers to the terminal information DB 208 to determine whether the user terminal 20 that has accessed the data storage unit 106 has access authority. In the terminal information DB 208, identification information of the user terminal 20 permitted to access the data storage unit 106 is registered. FIG. 4 is a table showing an example of information registered in the terminal information DB 208. When the data storage unit 106 includes a plurality of data storage areas (see FIG. 3), the presence / absence of access authority may be registered for each data storage area as shown in FIG. For example, the terminal name “t0001” has access authority only for the data storage area A, the terminal name “t0002” has access authority only for the data storage area B, and the terminal name “t0003” The access authority is given only to the data storage area C. The presence or absence of access authority is registered and changed by the administrator of the image forming apparatus 10, for example.

  The user authentication unit 205 refers to the user information DB 209 and authenticates the user who has accessed the data storage unit 106. In the user information DB 209, information of users permitted to access the data storage unit 106 is registered. FIG. 6 is a table showing an example of user information registered in the user information DB 209. For example, the user authentication unit 205 acquires the user ID and password input to the user terminal 20 when accessing a file stored in the data storage unit 106, and uses these to acquire the user ID and password registered in the user information DB 209. Match password. If they match, the user authentication unit 205 authenticates the user.

  The access restriction unit 206 determines the access operation content and restricts access to the data storage unit 106 based on the determined operation content and each information of the network type, access authority, and user authentication. For example, as shown in FIG. 7, if the operation content relates to confidential information such as “file retrieval”, “thumbnail display”, “acquisition of file attribute information (creator information, etc.)”, the second communication Access (operation) to the file via the network 30b is prohibited. Further, for example, even if these contents are used, the operation is permitted when the file is accessed through the first communication network 30a and the access authority and the user authentication are given. Note that if the operation content to the file via the second communication network 30b is “print output” or “file deletion”, the operation may be permitted because there is no possibility of unauthorized acquisition by an outsider. .

  The association between the operation contents shown in FIG. 7 and the restriction contents (prohibition contents) is registered in advance by the administrator of the image forming apparatus 10. The table of FIG. 7 is stored in the access restriction information DB 210. The operation content may be classified into operation content related to confidential information and operation content related to information that is not confidential information. Then, identification information indicating confidential information or identification information indicating non-confidential information may be attached to each operation content. The access restriction unit 206 determines the content of access restriction with reference to the table of FIG.

  The data transmission unit 207 transmits the file stored in the data storage unit 106 or information about the file to the user terminal 20 based on the content of the access restriction determined by the access restriction unit 206. For example, after the user A who has obtained access authority and user authentication performs a scanning operation in the image forming apparatus 10, the corresponding file F001 (see FIG. 1) is connected to the user terminal 20a connected to the first communication network 30a. When a scan image data) extraction operation is performed, the data transmission unit 207 transmits the target file F001 to the user terminal 20. On the other hand, when the user B performs the extraction operation of the same file F001 at the user terminal 20b (see FIG. 1) connected to the second communication network 30b, the data transmission unit 207 transfers the target file F001 to the user terminal 20 Do not send to. In this case (when transmission is refused), the data transmission unit 207 transmits an error message and a warning message to the user terminal 20b, and also identifies user identification information (here, the user A ID) associated with the file F001. Based on the above, a message indicating that unauthorized access has been made to the user terminal 20a of the user A may be transmitted.

  Next, the operation of the image forming apparatus 10 will be described. FIG. 8 is an operation flowchart of the image forming apparatus 10. Here, an operation when the user X accesses the data storage unit 106 in the user terminal 20 will be described.

  First, the access receiving unit 202 receives access (operation contents) to the data storage unit 106 from the user terminal 20 (S101). Next, the network type determination unit 203 determines which of the first communication network 30a and the second communication network 30b is used for the access. For example, the network type determination unit 203 determines whether or not the access is made via the first communication network 30a (S102).

  If the access is made via the first communication network 30a (YES in S102), the access authority determination unit 204 refers to the terminal information DB 208 (see FIG. 4) and refers to the user terminal 20 It is determined whether or not the user has access authority (S103). If the user terminal 20 has access authority (YES in S103), the user authentication unit 205 refers to the user information DB 209 (see FIG. 6) and authenticates the user X (S104). When the user X is authenticated (YES in S104), the data transmission unit 207 transmits information corresponding to the access operation content to the user terminal 20 (S105).

  In S103, if the user terminal 20 has no access authority (NO in S103) or if the user X has not been authenticated (NO in S104), the data transmission unit 207 receives information according to the operation content. Is not transmitted to the user terminal 20, and the process ends.

  On the other hand, when the access is not performed via the first communication network 30a (NO in S102), that is, when the access is performed via the second communication network 30b, The access restriction unit 206 determines the operation content (S106). If the operation content does not correspond to confidential information (NO in S107), the process proceeds to S105, and the data transmission unit 207 transmits information corresponding to the operation content to the user terminal 20 (S105). If the operation content corresponds to confidential information (YES in S107), the data transmission unit 207 ends the processing without transmitting information corresponding to the operation content to the user terminal 20.

  Here, in the above configuration, even if the access is performed via the second communication network 30b, if the operation content does not correspond to confidential information, the operation for the data storage unit 106 is performed. However, the present embodiment is not limited to this. For example, when the access is performed via the second communication network 30b, the access restriction unit 206 may immediately prohibit the operation on the data storage unit 106.

  According to the above configuration, when the data storage unit 106 of the image forming apparatus 10 is accessed from a non-secure communication network, the access can be restricted. Further, when the image forming apparatus 10 is connected to a different type of communication network and operated, the security of confidential documents in the data storage unit 106 can be easily maintained.

  The image forming apparatus 10 according to the present embodiment may further include a communication method determination unit 301 and a security level determination unit 302 in addition to the configuration (configuration example 1) in FIG. FIG. 9 is a functional block diagram of the image forming apparatus 10 according to the second configuration example. In the configuration example 2, the same functions as those in the configuration example 1 are denoted by the same reference numerals and the description thereof is omitted.

  The communication method determination unit 301 determines the communication method between the image forming apparatus 10 and the user terminal 20. More specifically, in the example of FIG. 1, the communication method determination unit 301 uses an encrypted communication (for example, SSL (Secure Socket Layer) communication) as a communication method between the first communication interface 108a and the user terminal 20a. Or non-encrypted communication. Similarly, the communication method determination unit 301 determines whether the communication method between the second communication interface 108b and the user terminal 20b is encrypted communication (for example, SSL communication) or non-encrypted communication.

  The security level determination unit 302 determines the security level for access from the user terminal 20 according to the combination of the type of communication network determined by the network type determination unit 203 and the communication method determined by the communication method determination unit 301. . For example, when the access uses encrypted communication via the first communication network 30a (Case 1), the security level is determined to be “4”, which is the highest level, and the access is performed based on the first communication. In the case of using unencrypted communication via the network 30a (case 2), the security level is determined to be “3”, which is one level lower, and the access is encrypted via the second communication network 30b. When using encrypted communication (Case 3), the security level is determined to be “2”, which is one level lower, and the access uses unencrypted communication via the second communication network 30b. If it is the case (case 4), the security level is determined to be the lowest level “1”. The higher the security level, the higher the security and the lower the risk of unauthorized access.

  The access restriction unit 206 restricts access to the file based on the operation content for the file stored in the data storage unit 106 and the security level. For example, as shown in FIG. 10, when the security level is the case 1, each predetermined operation is permitted, and when the security level is the case 2, only the “file retrieval” operation is prohibited. However, when the security level is case 3 described above, only operations related to confidential information such as “file retrieval”, “thumbnail display”, and “acquisition of file attribute information (creator information)” are prohibited, When the level is case 4 above, all predetermined operations are prohibited. The operation contents and the restriction contents (allowability contents) for the operations shown in FIG. The table of FIG. 10 is stored in the access restriction information DB. The access restriction unit 206 determines the content of access restriction with reference to the table of FIG.

  The data transmission unit 207 transmits the file stored in the data storage unit 106 or information about the file to the user terminal 20 based on the content of the access restriction determined by the access restriction unit 206.

  FIG. 11 is an operation flowchart of the image forming apparatus 10 according to Configuration Example 2. The same operations as those in the operation flow (see FIG. 8) of the image forming apparatus 10 according to the configuration example 2 are denoted by the same step numbers and description thereof is omitted. Here, the operation when the user X accesses the data storage unit 106 in the user terminal 20 will be described.

  When the access is performed via the first communication network 30a (YES in S102), the user terminal 20 has access authority (YES in S103), and the user X is authenticated (S104). YES), the communication method determination unit 301 determines whether or not the communication method of the first communication interface 108a is encrypted communication (S201). In the case of encrypted communication (YES in S201), the data transmission unit 207 transmits information corresponding to the access operation content to the user terminal 20 (S105). If it is not encrypted communication (NO in S201), the access restriction unit 206 determines the operation content. If the operation content does not correspond to confidential information (NO in S202), the data transmission unit 207 performs the operation operation. Information corresponding to the content is transmitted to the user terminal 20 (S105). If the operation content corresponds to confidential information (YES in S202), the data transmission unit 207 ends the process without transmitting information corresponding to the operation content to the user terminal 20.

  On the other hand, when the access is made via the second communication network 30b (NO in S102), the communication method determination unit 301 determines whether the communication method of the second communication interface 108b is encrypted communication. It is determined whether or not (S203). If it is encrypted communication (YES in S203), the access restriction unit 206 determines the operation content (S106). If the operation content does not correspond to confidential information (NO in S107), the process proceeds to S105, and the data transmission unit 207 transmits information corresponding to the operation content to the user terminal 20 (S105). If the operation content corresponds to confidential information (YES in S107), the data transmission unit 207 ends the processing without transmitting information corresponding to the operation content to the user terminal 20. If the communication method of the second communication interface 108b is not encrypted communication (NO in S203), the data transmission unit 207 ends the process without transmitting information according to the operation content to the user terminal 20.

  According to the configuration described above, by identifying whether or not the network storage access to the data storage unit 106 of the image forming apparatus 10 is encrypted by SSL or the like, the access is made depending on the network type and the presence or absence of encryption. Limits can be managed, and more flexible operation is possible for device managers.

  DESCRIPTION OF SYMBOLS 100 Image forming system, 10 Image forming apparatus, 20 User terminal, 30a 1st communication network, 30b 2nd communication network, 101 Control part, 102 Display part, 103 Input part, 104 Storage part, 105 Reading part, 106 Data storage part 107 output unit 108 communication unit 108a first communication interface 108b second communication interface 201 data acquisition unit 202 access reception unit 203 network type determination unit 204 access authority determination unit 205 user authentication unit 206 access Restriction unit, 207 data transmission unit, 208 terminal information DB, 209 user information DB, 210 access restriction information DB, 301 communication method determination unit, 302 security level determination unit.

Claims (9)

A communication interface;
Network type determination means for determining the type of communication network connected to the communication interface;
Access restriction means for restricting access to a file stored in a data storage unit of the image forming apparatus via the communication interface connected to the communication network based on at least the type of the communication network;
An image forming apparatus comprising: When the communication network is a predetermined communication network, the access restriction unit restricts access to a file stored in the data storage unit via the communication interface connected to the communication network. ,
The image forming apparatus according to claim 1. The access restriction unit restricts access to the file based on a type of the communication network and an operation content for the file stored in the data storage unit via the communication interface connected to the communication network. To
The image forming apparatus according to claim 1. When the communication network is a predetermined communication network, the access restriction unit is configured to determine a predetermined file for the file stored in the data storage unit via the communication interface connected to the communication network. Prohibit operations,
The image forming apparatus according to claim 1. A communication method determining unit that determines a communication method between the communication interface and a device connected to the communication interface via the communication network;
The access restriction unit restricts access to a file stored in the data storage unit via the communication interface connected to the communication network based on the type of the communication network and the communication method.
The image forming apparatus according to claim 1. The communication method determining means determines whether the communication method is encrypted communication or non-encrypted communication;
The image forming apparatus according to claim 1. Security level determining means for determining a security level for access to a file stored in the data storage unit according to a combination of the type of the communication network and the communication method;
The access restriction means restricts access to a file stored in the data storage unit via the communication interface connected to the communication network based on the security level.
The image forming apparatus according to claim 5, wherein the image forming apparatus is an image forming apparatus. The communication interface includes a first communication interface and a second communication interface,
The communication network includes an intranet and the Internet,
The first communication interface is connected to the intranet, and the second communication interface is connected to the Internet;
The image forming apparatus according to claim 1. A network type determination unit that determines a type of a communication network connected to a communication interface provided in the image forming apparatus, and
Access restriction means for restricting access to a file stored in a data storage unit of the image forming apparatus via the communication interface connected to the communication network based on at least the type of the communication network;
As a program to make the computer function as.

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