JP2020053100A - Information processing system, control method thereof and program - Google Patents

Abstract

To allow a selected permission server to issue a permission token by appropriately selecting the permission server with user information existing while maintaining security.SOLUTION: A permission server includes: first transmission means for specifying a first permission server with user information existing due to the reception of a permission request, and transmitting an authentication request to the first permission server; second transmission means for allowing the first permission server to authenticate a user, and transmitting a permission response together with information showing the first permission server with the user information existing as a transmission destination to a client; third transmission means for allowing the client to specify the first permission server by the second specification means on the basis of the permission response, and transmitting a token request for requesting a permission token for accessing a resource server to the first permission server; and issuing means for allowing the first permission server to issue the permission token in response to the token request.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an information processing system for specifying an authorization endpoint of an authorization server, and a control method and a program thereof.

  There is a form in which an application of a client such as an MFP acquires an authorization token from an authorization server via a token provider of the client. The authorization token is a token indicating that the client delegated the authority by the authorization operation of the authenticated user is permitted to access the API published by the resource server. By using the authorization token, the client can access the API published by the resource server without passing user information such as ID, password information, and authorization information to the resource server or the authorization server. For example, if the client is an MFP, the MFP can use a Web service such as a print service or a form service provided by the resource server using the obtained authorization token, and the MFP can display and print data.

  The authorization token is issued when the authorization server executes an authorization flow Authorization Code Grant of a standard protocol called OAuth 2.0. Specifically, the user authorizes, via a web browser, the client to use the web service of the resource server, and the authorization server issues an authorization token to the token provider that has transmitted the token request. . A token request is a request sent to an authorization server for a token provider to obtain an authorization token.

  Patent Literature 1 discloses a system in which an application of a client acquires an authorization token from an authorization server via a token provider of the client.

JP 2017-107396A

  The user information described above is managed by an authorization server in a specific region (hereinafter, region). When there are a plurality of pieces of user information corresponding to a plurality of users, the user information is not always managed collectively by one authorization server. For example, when an application is distributed in a plurality of regions and used worldwide, user information of a user who uses the application is managed by an authorization server in the region where the user is located. Then, the authorization server where the user information is located issues an authorization token. The reason that the authorization server issues the authorization token according to the location of the user information is that there is a restriction on the movement or sharing of user information to another region from the viewpoint of personal information protection and security, etc. The user is authenticated using the restricted user information. An authorization token is issued in response to the authorization by the authenticated user.

  Authorization by the user is performed via an authorization confirmation screen (described later) that is displayed as a result of an authorization request sent from the client to the authorization server. Assuming that the application is used in multiple regions, the options of the authorization server to which the authorization request is sent are expanded. Therefore, the token provider needs to specify the authorization server that is the destination of the authorization request and where the user information is located.

  As a method of specifying the authorization server, for example, there is a method of specifying a region by a user operation. However, this method has a problem of security in that it is complicated by manual operation and that the region selection is left to the user operation.

  An object of the present invention is to appropriately select an authorization server in which user information exists while maintaining security, and to have the selected authorization server issue an authorization token.

  An information processing system including: a client that transmits an authorization request for permitting a user to access a resource server by a client; and two or more authorization servers existing in different regions from each other, wherein the authorization server includes: First specifying means for specifying a first authorization server where user information of a user who authorizes the access is located, and the client specifies an authorization server present in the region based on region information of the region And second authorization means, wherein the authorization server, in response to receiving the authorization request, the first authorization server in which the user information of the user authorizing the access is located in the first identification By means of the first authorization server identified and A first transmission unit for transmitting an authentication request for authenticating the user, and the first authorization server authenticates the user with the transmission of the authentication request by the first transmission unit. Along with information indicating the first authorization server where the user information of the authenticated user is located as a destination, a second transmission unit that transmits an authorization response that is a response to the authorization request to the client, and the client includes: Based on the authorization response transmitted by the second transmission unit, the second identification unit identifies the first authorization server, and accesses the resource server for the identified first authorization server. A third transmission means for transmitting a token request for requesting an authorization token for performing, the first authorization server, Serial third information processing system having, an issuing means for issuing the authorization token for token request transmitted by the transmission means.

  The present invention can appropriately select an authorization server in which user information exists while maintaining security, and the selected authorization server can issue an authorization token.

FIG. 1 is a diagram illustrating a network configuration of an information processing system. FIG. 2 is a diagram illustrating a hardware configuration of various devices. FIG. 2 is a diagram illustrating a software configuration of various devices included in the information processing system. The figure which shows the function which a token provider has. Authorization flow in the information processing system. 5 is a flowchart showing token request processing in the client 400. 5 is a flowchart showing a token response process in the authorization server 201. An example of a claim of an authorization request (authorization assertion) in JWT format. An example of a claim for id_token. An example of a claim of a token request (Token Assertion). An example of a token response including user move destination information. An example of an authorization confirmation screen. Flow of processing at the time of client registration.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. Note that when either the authorization server 200 or the authorization server 201 described below may be used, it is described as “authorization server 200, 201”, and when either the resource server 300 or the resource server 301 may be used, “resource server 300, 301” is described. I do. When the authorization server 201 issues an authorization token, the API published by the resource server 301 is accessed using the authorization token issued by the authorization server 201. The same applies to the relationship between the authorization server 200 and the resource server 300.

[Example 1]
An information processing system according to an embodiment of the present invention will be described with reference to FIG. The information processing system is realized by a network configuration as shown in FIG. A WAN (Wide Area Network) 100 is constructed by a WWW (World Wide Web) system. The WAN 100 and various devices 200 to 500 are connected via a LAN (Local Area Network) 101.

  The authorization servers 200 and 201 are servers for realizing OAuth 2.0, and perform processes such as receiving and managing authentication requests. FIG. 1 shows a configuration in which the authorization server 200 and the resource server 300 and a configuration in which the authorization server 201 and the resource server 301 are connected via the LAN 101, but a configuration in which they are connected via the WAN 100 is also possible.

  The authorization servers 200 and 201 are connected to a database server (not shown) via the LAN 101. The data used when the authorization servers 200 and 201 implement their functions may be stored in the database server. In the present embodiment, the authorization server 200 and the resource server 300 and the authorization server 201 and the resource server 301 are described as different servers, but the physical configuration of the various servers does not matter. For example, a form in which the functions of both servers are configured on the same server, or a form in which a plurality of servers realize the function of one authorization server or resource server may be used.

  The location of the resource server 300 and the authorization server 200 (or the resource server 301 and the authorization server 201) is not limited to a configuration in the same region or in the same system. As long as the resource server 300 can inquire about the authorization token issued by the authorization server 200, the location form does not matter. Alternatively, the resource server 300 may verify the signature information received together with the authorization token.

  Examples of the client 400 include a printer, an MFP, a PC, a smartphone, and the like. The terminal 500 has a Web browser 510, and examples thereof include a PC and a smartphone. The user can use various device functions such as a user authentication request to the authorization servers 200 and 201 and a login operation to the client 400 via the Web browser 510.

  The client 400 also includes a Web browser 410. The user operates the web browser 410 or the web browser 510 to execute an authorization operation described later. The client 400 and the terminal 500 are connected via the LAN 101. Hereinafter, when it does not matter which of the Web browser 410 and the Web browser 510 is executed, it is referred to as “Web browsers 410 and 510”.

  In this embodiment, it is assumed that the client 400 and the terminal 500, the authorization server 200, and the resource server 300 are located in the region "jp", and the authorization server 201 and the resource server 301 are located in the region "eu". The region in the present embodiment refers to a region where there are some restrictions such as information technology and legal restrictions on the movement of user information out of the region from the viewpoint of protection of personal information and security.

  Next, the hardware configuration of the authorization servers 200 and 201, the resource servers 300 and 301, the client 400, and the terminal 500 will be described with reference to FIG. FIG. 2 is a block diagram of a general information processing apparatus. In various devices according to the present embodiment, a hardware configuration of the general information processing apparatus and an information processing apparatus provided as IaaS (Infrastructure as a Service) Virtual hardware configuration can be applied. In FIG. 2, the client 400 is described as an example, but the resource servers 300 and 301, the authorization servers 200 and 201, and the terminal 500 also have the same hardware configuration.

  The CPU 2001 is a unit that takes out a program from the RAM 2002, the ROM 2003, the external memory 2011, or the like, executes a program command, and controls the client 400. The sequence described below is realized by executing the instructions of this program. The CPU 2001 controls each block connected to the system bus 2004.

  The RAM 2002 is a work memory used when the CPU 2001 executes an instruction. A program such as an OS or an application stored in the ROM 2003 or the external memory 2011 is loaded into the RAM 2002, and the CPU 2001 reads out the instructions of the program to execute the instructions. The ROM 2003 is a storage device in which installed programs including an application program and an OS, data, and the like are recorded.

  A KBC (keyboard controller) 2005 is a unit that controls an input from a KB (keyboard) 2009 or a pointing device (not shown). A CRTC (Cathode Ray Tube Controller) 2006 is a unit that controls display on the CRT display 2010. A DKC (Disk Controller) 2007 is a unit that controls data access to the external memory 2011. An NC (network controller) 2008 executes a communication control process with another device connected via the WAN 100 or the LAN 101. In the case of a virtual information processing apparatus provided as IaaS, the virtual information processing apparatus does not include the KBC 2005 or the CRTC 2006, and is configured to be operated from a keyboard or a CRT display of a terminal connected via the NC 2008.

  Note that in the following description, unless otherwise specified, the hardware of the hardware when executing the functions of the various devices is the CPU 2001, and the software is the program installed in the RAM 2002, the ROM 2003, the external memory 2011, or the like. It is assumed that

  Next, the functions of the authorization servers 200 and 201, the resource servers 300 and 301, the client 400, and the terminal 500 will be described with reference to FIG. Since the authorization server 201 has the same function as the authorization server 200 and the resource server 300 has the same function as the resource server 301, in the description of FIG. 3, the authorization server 200 and the resource server 300 will be described in addition to the description of the client 400.

  The authorization server 200 has an authorization server unit 210 and an HTTP server unit 220. The HTTP server unit 220 is connected to the client 400 and the terminal 500 via the WAN 100, and has a function of performing HTTP communication with the Web browsers 410 and 510 and an application 420 described later. Further, the HTTP server unit 220 is capable of performing communication by SSL / TLS and has a certificate store (not shown).

  The authorization server unit 210 has a function of receiving requests from the web browsers 410 and 510 via the HTTP server unit 220 and responding to the result of the received requests. Specifically, the HTTP server unit 220 receives a request for user authentication from the Web browsers 410 and 510, and generates an authentication token associated with the successfully authenticated user information. The generated authentication token is notified to Web browsers 410 and 510. The authentication token is a token for indicating that the user has logged in to the authorization server 200, or a token for verifying whether the user has been authenticated in the authorization server 200. By using the authentication token, the authorization server 200 can identify the user. Also, the authorization server unit 210 can be configured to hold a secret key for adding signature information to the authorization token. In this case, the signature information is added to the authorization token using the secret key, and the authorization token with the signature information is issued to the client 400.

  The resource server 300 has a resource server unit 310. The resource server unit 310 has a function of publishing an API for providing a Web service. Note that, similarly to the authorization server 200, an HTTP server unit may be provided, and transmission / reception to / from the outside may be executed via the HTTP server unit.

  The client 400 has a Web browser 410, an application 420, an authentication unit 430, and a token provider 440. The Web browser 410 is a function realized by a user agent for using WWW. The web browser 410 communicates with the authorization server 200 and the token provider 440 according to a user operation. The Web browser 510 provided in the terminal 500 has the same function as the Web browser 410. The application 420 has a function of acquiring an authorization token from the authorization server 200 via the token provider 440. Using the obtained authorization token, the application 420 can use an API published by the resource server 300.

  The token provider 440 receives the authorization token request from the application 420 and acquires an authorization token by communicating with the authorization server 200. The user performs an authorization operation by communicating with the authorization server 200 and the token provider 440 using the Web browsers 410 and 510.

  Here, the authorization token request is a request that the application 420 sends to the token provider 440 to obtain an authorization token. One token request is a request that the token provider 440 sends to the authorization servers 200 and 201 to obtain an authorization token. As described above, it should be noted that, even for requests for obtaining the same authorization token, the name of the request is changed because the source and destination of the request are different.

  The token provider 440 uses X.400 as a vendor default credential to prove the token provider 440 itself. 509 format and its private key. The authorization server 200 can authenticate the token provider by using the client certificate and its private key when establishing communication with the authorization server 200.

  The authentication unit 430 is a function for authenticating a user. The user inputs a local user ID and a local user password on an input screen (not shown) of the client 400 in order to use the function of the client 400. The client 400 that has received the input information performs authentication processing of the user by comparing the information (the local user ID and the local user password) registered in advance with the input information in the authentication unit 430, and generates a login context. I do. The form of the authentication processing is not limited to this, and for example, authentication using an IC card or biometric authentication such as a fingerprint may be used.

  Here, the login context is information for identifying a local user in the client 400, and includes, for example, a local user ID. The login context is generated in the OS (not shown) of the client 400 when a local user logs in to the client 400, and is deleted when the local user logs off. When a login context is generated by the login operation of the local user, a Web page to which the logged-in local user has access authority is published on the Web browser 410. By erasing the login context by the logoff operation of the local user, security can be ensured without exposing a Web page to which the local user has access authority to another user. The login context generated by the authentication unit 430 is shared by the application 420, the authentication unit 430, and the token provider 440.

  In the present embodiment, a case where the user directly operates the client 400 to log in will be described. In that case, the authentication unit 430 responds to the web browser 510 with a login screen (not shown). The user inputs the local user ID and the local user password on the login screen, and the user information is authenticated.

  The function of the token provider 440 will be described with reference to FIG. The token provider 440 includes an endpoint selection unit 610, a token acquisition unit 620, a token management unit 630, a token distribution unit 640, a client registration unit 650, a key management unit 660, an Assertion JWT generation unit 670, and an id_token verification unit 680.

  The endpoint selection unit 610 has a function of transmitting an authorization request to an authorization endpoint in an authorization flow described below. At this time, the endpoint selection unit 610 selects an authorized endpoint URL common to all regions (hereinafter, a common URL for all regions). Table 1 shows an example of a URL common to all regions.

  Table 1 has columns of “No.” (item number) and “Authorization Endpoint URL”, and the URL common to all regions is registered in “Authorization Endpoint URL”. The registration of the URL common to all regions in Table 1 may be executed from an external application or the like, and the form of registration in Table 1 does not matter.

  The token acquisition unit 620 has a function of transmitting a token request to a token endpoint in an authorization flow described below. The token end point is determined by the token acquisition unit 620 based on id_token described later.

  The token management unit 630 has a function of managing the authorization token acquired by the token acquisition unit 620 for each local user ID. Table 2 shows an example of the token database managed by the token management unit 630.

  Table 2 has columns of “No”, “local user ID”, “region”, and “authorization token”, and uses the local user ID as a primary key. Table 2 is generated or updated by execution of an authorization flow (S1.0 to S2.2) described later, and is managed by the token management unit 630. Here, the information stored in the “region” is information obtained from id_token described later, and indicates the region of the authorization server from which the authorization token is acquired.

  The token distribution unit 640 has a function of specifying region information and an authorization token associated with the local user ID (included in the authorization token request) received from the application 420 based on Table 2, and transmitting the authorization token to the application 420. .

  If the local user ID received from the application 420 does not exist in Table 2, it is determined that the authorization flow of FIG. 5 has not been executed. Then, the endpoint selection unit 610 executes the authorization flow of FIG. 5, and stores the acquired authorization token, the local user ID, and the region information acquired from id_token described later in the token management unit 630 (Table 2).

  The client registration unit 650 has a function of registering a client with the authorization server 200 or 201. The key management unit 660 holds an assertion private key (encryption key for Assertion JWT signature) acquired at the time of client registration. This key is used when signing an authorization assertion and a token assertion described below.

  Further, the key management unit 660 holds an id_token public key (a decryption key for verifying the signature of the id_token) corresponding to the id_token private key (an encryption key for giving a signature to the id_token) held in the authorization server 200 or 201 in advance. And has a function of holding and acquiring each key.

  The assertion JWT generation unit 670 has a function of generating an authorization assertion and a token assertion, which will be described later, using the assertion secret key of the key management unit 660. The id_token verification unit 680 has a function of verifying an id_token described later using the id_token public key of the key management unit 660. The functions of the token provider 440 have been described above.

  The flow at the time of client registration and the authorization flow will be described with reference to FIGS. In addition, detailed description of the processing described above is omitted.

  First, processing at the time of client registration will be described with reference to FIG. As a preliminary operation for executing the authentication / authorization flow of the present embodiment based on the Authorization Code Grant in OAuth 2.0, a registration request for registering the client 400 with the authorization server 200 is made (S0.0). Specifically, the registration request of the client 400 is transmitted to the registration endpoint (the endpoint is described as “EP” in FIGS. 5 and 13) of the authorization server 200, and is transmitted when the client 400 is activated or in S1 described later. The process is started when the client 400 has not been registered at the start of the authorization flow of. As a method for transmitting the client registration request, a method in which the client registration unit 650 of the token provider 440 actively communicates with the authorization server 200, or a method in which a user accesses the authorization server 200 via the web browser 510 to register the client 400 Method.

  The client registration request in S0.0 includes a client name, a description, an icon image, and a redirect URI that is an essential parameter to be displayed on an authorization confirmation screen described later. The redirect URI is an address that specifies a transmission destination to which the client 400 transmits an authorization response described below. Upon receiving the registration request of the client 400, the authorization server 200 generates a client ID for identifying the client 400, a key pair (Assertion public key, Assertion private key) for authenticating the client, and returns a registration response of the client 400. Is transmitted to the client 400 (S0.1). As for the method of transmitting the assertion private key, the key may be transmitted after being encrypted by a key exchange protocol.

  The token provider unit 440 stores the assertion private key in the key management unit 660. The authorization server 200 holds the client ID, the assertion public key, the various information acquired in S0.0, and the redirect URI in association with each other. The token provider unit 440 holds the client ID and the assertion private key received in S0.1 in the key management unit 660.

  The client registration in FIG. 13 is executed for the authorization server 200 existing in the same region as the token provider 440 (client 400). Information about the client 400 generated and stored at that time (such as a client ID and an assertion public key) is shared not only with the authorization server 200 but also with another authorization server (for example, the authorization server 201). As a result, even if the transmission destination (S1.5 described later) of the authentication request differs for each user, the use of the client ID and the assertion public key shared by the authorization server allows the issuance of the id_token described later and the generation of the authorization token. Exchange such as issuance can be performed.

  The above is the client registration processing which is the preparatory operation for executing the authorization flow.

  An authorization flow after client registration will be described with reference to FIG.

  The user logs in to the client 400 (S1.0). The authentication unit 430 of the client 400 generates and holds a login context that is information for identifying a logged-in user. By using the generated login context, information (such as a local user ID) for specifying the logged-in user can be acquired from the login context.

  When the user accesses the URI of the authorization start via the Web browser 510, the authorization flow based on OAuth 2.0 of the present embodiment is started (S1.1). When the client 400 accesses the authorization start URI for starting the authorization flow, it sends an authorization request to the authorization endpoint (S1.2). This authorization endpoint is accessed via a URI common to all regions.

<Authorization endpoint>
Here, a method for specifying the authorization endpoint will be described. The token provider 440 first sends an authorization request to a URI common to all regions in order to select an appropriate authorization server and acquire an authorization token. A DNS (Domain Name System) server accessed as a result of the transmission of the authorization request manages link data (DNS records) between the authorization endpoint URL and the IP address. When accessing the authorization server via a web browser, the authorization endpoint URL common to all regions is converted to an IP address (name resolution) based on the DNS record via the DNS server. At that time, the Geo Routing function (in the case of AWS, the Geo Routing function) refers to the geographic database from the IP address of the authorization request source (client 400), is converted into an appropriate authorization endpoint URI, and is transmitted to the authorization request source. You.

  In this embodiment, the client 400 and the authorization server 200 exist in the same region “jp”. Therefore, when the token provider 440 accesses the URI common to all regions via the web browser 510, the authorization end point URI of the authorization server 200 existing in the same region “jp” is returned by the Geo Routing function. The token provider 440 sends an authorization request to the authorization endpoint URI. S1.2 shown in FIG. 5 shows a state in which the authorization request has been transmitted to the authorization endpoint URI specified by the Geo Routing function.

<Authorization request>
The authorization request transmitted by the token provider 440 will be described. When the token provider 440 transmits the authorization request, the token provider 440 also transmits a request for obtaining security information (id_token described later).

  The authorization request is expressed in a signed JWT format including response_type, client_id, redirect_uri, and state parameters. Hereinafter, the authorization request in the JWT format will be referred to as “authorization assertion” for convenience of description. The authorization assertion includes a header and a payload described below.

  The authorization request is attached using the assertion private key obtained at the time of the client registration response in S0.1, and the signature algorithm is ES256 (ECDSA using P-256 curve and SHA-256) specified by JWA (RFC7518 JSON Web Algorithms). hash). FIG. 8A shows an example of the header of the authorization assertion.

  “Type” is the type of JWT, and a value “Assertion” indicating that it is an assertion JWT is set. “Alg” indicates a signature algorithm, and a value “ES256” is set. “Kid” indicates the ID of the assertion public key and the assertion secret key used for the JWT signature verification. The value set as “kid” includes a Thumbprint value of a public key based on the JSON Web Key (JWK) Thumbprint (RFC 7638) specification in addition to the UUID and the like.

  FIG. 8B shows an example of the payload claim of the authorization assertion. “Response_type” indicates a response type of OAuth 2.0, and a value “id_token” is set in order to acquire id_token in an authorization response described later.

  “Iss” is an identifier for identifying a JWT issuer (issuer), and in the case of an authorized assertion, a UUID indicating a client ID is set as a value. “Sub” indicates a user identifier, and a UUID indicating a client ID is entered similarly to “iss”. “Iss” and “sub” respectively encode a character string expressed in the URL Safe Base64 format and include it in the JWT format authorization request. “Exp” indicates the expiration date of the Authorized Assertion, and “iat” indicates the date and time of issuance of the Authorized Assertion, both of which are represented by the number of seconds elapsed since Unix Epoch (January 1, 1970 (Coordinated Universal Time)).

  The payload claim in FIG. 8B further includes “redirect_uri” indicating the redirect URI of OAuth 2.0 and “state”. “State” is information for uniquely associating an authorization request with an authorization response, and is used to prevent a cross-site request forgery (CSRF) attack or a token replacement attack. Therefore, the state needs to be a value that cannot be estimated and does not overlap. The client 400 that has received the authorization response described below verifies whether the value of the state matches the value of the state transmitted in the authorization request in S1.2. In order to identify the local user who has executed the authorization request, the state issued by the client 400 is managed by the client 400 in association with the redirect URI and the login context.

  The token provider 440 creates an authorization assertion as shown in FIG. 8 based on the JWT specification. The authorization Assertion is given a signature (not shown) in the JWT format using the above-mentioned Assertion private key. The above is the description of the authorization request.

  Returning to the description of FIG. The authorization server 200 that has received the authorization request in S1.2 returns a login screen common to all regions to the Web browser 510 (S1.3). The login screen includes the authorization assertion in the hidden field. The user inputs a user ID and a password via the Web browser 510, and makes an authentication request to the authorization server 200 (S1.4). At this time, the authorization assertion previously received as the hidden field of the login screen is POSTed at the same time as the authentication request. Here, the user ID transmitted to the authorization server 200 in S1.4 is a user identifier for logging in to the authorization server, and is different from the local user ID in S1.0.

  The authorization server 200 determines the region to which the user ID belongs (the region of the authorization server that manages the user information of the user specified by the user ID), and redirects the login screen to the authorization server in the appropriate region (S1.5). . Table 3 shows an example of a user affiliation region table shared by authorization servers in different regions.

  The user ID (hash value) is a hash value calculated by the sha256 algorithm for the user ID character string. The belonging region is a region to which the user specified by the user ID belongs. From Table 3, "user1 @ 110AA" (hash value: b927736961c523464a5559982a527eccd18277cbeeec092ea67959990241bcc3) belong Region of the "jp", "user2 @ 110Ab" (hash value: 8afe0cae0d1a4fbb380348ff1999aa1d40ecf829a730b82bdcb6a628796b51b2) is affiliated Region "eu", "user3 @ 120AA" (hash value : 25dac1eaeccc81673cb64157be38babb6a13b53b020e2d88dfdca70054c84cf03) belongs to “jp”.

  The user affiliation region table (Table 3) is updated at the time of user registration, and the latest data is periodically shared by the authorization servers in all regions. Since the user ID is a hash value, it is generally impossible to recover the user ID from this value. Therefore, even if the user belonging region table (Table 3) is shared by the authorization servers in all regions, it does not mean that the user information is shared.

  The redirection of the login screen in S1.5 will be described. It is assumed that the user ID “user2 @ 110 Ab” and the password “password” have been input on the login screen common to all regions in S1.3. The authorization server 200 calculates a hash value of the input user ID. The region "eu" to which the user belongs is specified by referring to Table 3 from the calculated hash value. Then, the Authorization Assertion POSTed with the user ID, the password, and the authentication request is returned to the Cookie of the Web browser 510, and is redirected as an authentication request to the login URL of the authorization server 201 which is the authorization server of the region "eu". .

  In the present embodiment, the form in which the login URL of the authorization server 201 is specified from the affiliation region stored in Table 3 has been described. More specifically, the type of the login URL of each authorization server in a different region is determined in advance, and by applying the “affiliation region” in Table 3 to the type, the login URL of each authorization server is specified. is there. The present invention is not limited to the mode of the present embodiment (Table 3), but may be a mode in which the login URL of the authorization server is associated with the hash value of the user ID and managed.

  The authorization server 201 verifies whether the link information between the user ID and the password redirected in S1.5 matches the link information registered in advance, and issues an authentication token if they match. The issued authentication token is returned to the cookie of the web browser 510. The above is the description of the redirect of the login screen.

  Returning to the description of FIG. The authorization server 201 responds to the user with an authorization confirmation screen for agreeing to the authorization of the client 400 to the web browser 510 (S1.6). FIG. 12 shows an example of the authorization confirmation screen. The authorization confirmation screen 1200 includes a client name 1201 of the client 400 to be authorized, a description 1202 relating to the client 400, and an icon image 1203 as contents for requesting consent of the user. Further, the authorization confirmation screen 1200 includes a permission button 1204 for the user to authorize the client 400 and a reject button 1205 for rejecting the authorization. The processing when the reject button 1205 is pressed or the processing when the permission button 1204 is pressed (S1.7) will be described later.

  The authorization confirmation screen includes an authorization assertion included in the redirected authentication request as a hidden field. However, after verifying the signature of the authorization Assertion included in the authentication request, the combination of the client ID and the redirect URI included in the authorization Assertion becomes the client ID and the redirect shared by the authorization server 201 and the authorization server in another region. If the combination does not match with the URI, an error screen is returned to the web browser 510 instead of the authorization confirmation screen. This can prevent unauthorized redirection to the URL. Also, when the reject button 1205 on the authorization confirmation screen 1200 is pressed, an error screen is transmitted to the Web browser 510.

  If the user logged in to the authorization server 201 has already performed the authorization operation with the same client ID, the processing of S1.6 and S1.7 can be omitted.

  After the authorization button 1204 is pressed, the authorization operation by the user is executed (S1.7), and then the authorization server 201 POSTs the authorization assertion included in the authorization operation to the authorization endpoint of the authorization server 201. (S1.8). The authorization server 201 verifies the authorization assertion posted to the authorization endpoint. Here, the reason for verifying the authorization Assertion is that the authorization server 201 is an instruction from outside (the Web browser 510) to the authorization server 201 (authorization operation in this case). There is a need.

  If the verification of the authorization assertion is successful, an id_token is generated, and the id_token is transmitted as an authorization response to the redirect URI of the client 400 (S1.9). That is, the generated id_token is transmitted from the authorization server 201 to the client 400 via the Web browser 510. At the time of transmission, id_token is added as a query parameter of the redirect URI and transmitted to the Web browser 510. Thereby, the id_token is redirected to the destination specified by the redirect URI. The id_token generated by the authorization server 201 is stored in the authorization server 201 in association with the client ID, the user ID, and the redirect URI.

  If the verification of the authorization assertion in S1.8 fails, the authorization server 201 returns an authorization error to the web browser 510.

<Id_token>
The id_token generated by the authorization server 201 is a security token including a claim relating to end user authentication by the authorization server, and is specified in the OpenID Connect specification (OpenID Foundation OpenID Connect Core 1.0). id_token includes region information of the use destination of the authorization token, and is represented by a signed JSON Web Token (JWT RFC7518, JWT RFC7515). Generally, id_token includes a group of claims relating to end-user authentication (Claims about the Authentication) and a group of claims relating to other user attributes. The id_token in the present embodiment includes “iss”, “sub”, “aud”, “exp”, “iat”, and “nonce” in the payload claim.

  The signature of id_token is given using an id_token private key, and the signature algorithm is an ES256 signature defined by JWA. FIG. 9A shows an example of the header of id_token. Note that the description of the parts already described in FIG. 8 is omitted.

  The header of id_token includes a signature algorithm “ES256” of id_token indicated by “alg”, and “kid” indicating an ID of an id_token public key / id_token private key used for signature verification of id_token. The value of Thumbprint of the public key based on the JSON Web Key (JWK) Thumbprint (RFC 7638) specification may be used as the kid in addition to the UUID and the like.

  FIG. 9B shows an example of a claim relating to the user attribute present in the payload of id_token. According to the definition of OpenID Connect Core 1.0, the URL starting with “https: //” that does not include the query and the fragment part is set in “iss”. In this case, since the issuer of id_token is the authorization server 201, “https://eu-auth.example.com” indicating the authorization server 201 is set.

  “Aud” indicates an issue target of id_token, and the value of the client ID is set this time. “Sub” and “aud” are character strings represented in a URL Safe Base64 format. “Nonce” is included in id_token mainly for the purpose of preventing replay attacks, and the value of the state parameter is set. The above is the description regarding id_token.

  Returning to the description of FIG. An id_token private key is required to give the id_token signature, and an id_token public key is required to verify the id_token. It is assumed that the id_token secret key is shared in advance by each authorization server in a different region, and the id_token public key is stored in the client 400 in advance.

  The client 400 that has received the authorization response in S1.9 verifies the signature (not shown) of the id_token included in the authorization response, and the “nonce” included in the id_token matches the “state” managed by the client 400. Is determined. If it is determined that they match, the client 400 refers to “iss” of the id_token and acquires the URL of the authorization server 201 that is the issuer of the id_token. This time, it is assumed that the id_token verification unit 680 of the token provider unit 440 acquires the URL “https://eu-auth.example.com” of the authorization server 201 by referring to “iss” of the id_token. The character string “eu” before the hyphen of the host name “eu-auth” of the URL of the acquired authorization server 201 is referred to, and the region character string is recognized. The recognized region character string is stored in the token database (Table 2).

  The token database further stores the local user ID currently logged in to the client 400. Then, a token request for acquiring the authorization token is transmitted to the token endpoint of the authorization server 201 (S2.0). The token request is described in the JWT format. Hereinafter, the JWT format token request is referred to as a "token assertion" to distinguish it from the assertion JWT at the time of the authorization request. The token assertion includes a header and a payload. The token Assertion includes a client ID, a user ID obtained from the id_token sub claim, and a redirect URI. FIG. 10A shows an example of the header of the token assertion.

  “Type” indicates the type of the JWT, and a value “Assertion” indicating that it is an assertion JWT is set. “ES256” indicating the signature algorithm, and “kid” indicating the ID of the assertion public key / assertion secret key used for the JWT signature verification are included. The value of Thumbprint of the public key based on the JSON Web Key (JWK) Thumbprint (RFC 7638) specification may be used as the kid in addition to the UUID and the like.

  FIG. 10B shows an example of a payload claim of the token assertion. The description of the parts already described above is omitted.

  “Response_type” indicates a response type of OAuth 2.0, and “id_token” is set. Also, “iss” indicating the client ID of OAuth 2.0, “redirect_uri” indicating the redirect URI of OAuth 2.0, and “sub” indicating the user identifier are included in the payload claim. In the present embodiment, a value included in id_token acquired earlier is set in “sub”.

  The token provider 440 creates a token assertion including a header and a payload as shown in FIG. 10 based on the JWT specification. The token Assertion includes a signature attached using the Assertion private key acquired at the time of the client registration response (details of the signature part of the JWT are omitted).

  Upon receiving the token request in S2.0, the authorization server 201 verifies the signature of the token assertion using the assertion public key. Furthermore, the authorization server 201 analyzes the token Assertion received in S2.0, and acquires “iss”, “sub”, “redirect_uri”, “iat”, and “exp”. According to the analysis of the acquired information, whether the client 400 that transmitted the authorization request in S1.2 matches the client 400 that transmitted the token request in S2.0, or the user information of the user requesting the authorization token is transmitted to the authorization server 201. The existence can be verified by the authorization server 201.

  If the verification is successful, the authorization server 201 sends an authorization token as a token response to the client 400 (S2.1). The token management unit 630 of the token provider 440 stores the obtained authorization token in the token database (Table 2).

  The token distribution unit 640 of the token provider 440 searches the currently logged-in user ID from the token database (Table 2) of the token management unit 630, and acquires the region information and the authorization token. The acquired region information and the authorization token are transmitted to the application 420 (S3.0).

  The application 420 accesses the API published by the resource server 301 based on the received authorization token and the region information (S3.1). Specifically, an API published by the resource server 301 is accessed by using a resource server URL (not shown) for each region which is built in the application in advance and region information acquired from the token provider 440. In this embodiment, the resource request of S3.1 is transmitted to the resource server 301 existing in the same region eu as the authorization server 201 that manages the user information.

  The above is the authorization flow. According to this embodiment, it is possible to appropriately select an authorization server in which the user information exists without the manual operation of the user, and the selected authorization server can issue the authorization token. Using the obtained authorization token, a resource can be requested from a resource server in the region where the user information exists.

[Example 2]
In the second embodiment, if the user moves to another region before the token request (S2.0) after the authorization request (S1.2) and the authorization response (S1.9) end normally, the token The means for continuing the acquisition will be described.

  Specifically, it is assumed that the user authorized in S1.2 to S1.9 has moved to another region due to a business trip or moving. At that time, it is necessary to move the user information of the moved user to the authorization server in the destination region. It is assumed that a token request is transmitted to the authorization server that authorized the user before moving the user while moving the user information.

  First, a process when the authorized user information is transferred from the authorization server 201 between the authorization response (S1.9) and the token request (S2.0) will be described with reference to FIG. 6 is a token request process mainly executed by the token provider 440 (client 400).

  The token provider 440 sends an authorization request to the authorization server 200 (S6.0). This processing is the same processing as S1.2 in the first embodiment. The token provider 440 receives the authorization response (S6.1). This processing is the same as S1.9 in the first embodiment. At that time, the token provider 440 verifies id_token included in the authorization response. After the verification, a JWT-format token request (token Assertion) is transmitted to the token endpoint of the authorization server 201 (S6.2), and a token response to the request is received (S6.3). The token provider 440 analyzes the token response and determines whether the token response includes an authorization token (S6.4). After it is determined that it is included, the process proceeds to S3.0 as in the first embodiment. After it is determined that the token response is not included, it is determined whether the token response includes the user destination information (S6.5).

  FIG. 11 shows an example of the token response including the user destination information. “Destination_url” in FIG. 11 indicates a destination token endpoint, which is a destination of user information, determined by the authorization server 201 based on user destination information described later.

  If it is determined in S6.5 that the user response destination information is included in the token response, the process returns to S6.2, and the token request is made again to the destination token endpoint specified by the user destination information. Send. The processing of S6.2 to S6.5 is repeatedly executed as long as "destination_url" is included in the token response. However, when the number of times of execution exceeds a certain value or when a certain time elapses, a form in which the token provider 440 generates an error and terminates the processing is also possible.

  When it is determined in S6.5 that the user response destination information does not exist in the token response, the token provider 440 returns to the processing of S6.0, and transmits an authorization request to the authorization server 200. The process of returning from S6.5 to S6.0 is repeatedly executed until the user response destination information is included in the token response. However, similarly to the processing returning to S6.2, it is also possible to set a limit on the number of times of execution and the processing time, and when the number of times of execution and the processing time exceed the limit, the token provider 440 may generate an error and terminate the processing. The above is the processing of FIG.

  The process in which the authorization server 201 that has received the token request from the token provider 440 transmits a token response will be described with reference to FIG. As in S2.0, the authorization server 201 receives the token assertion at the token endpoint (S7.1). The authorization server 201 verifies the token assertion using the assertion public key, and acquires a user identifier from “sub” (S7.2). At this time, the authorization server 201 determines whether the acquired user identifier exists in the authorization server 201 (S7.3). If it is determined that it exists, an authorization token is transmitted to the client 400 as a token response, as in S2.1 of the first embodiment (S7.4). If it is determined that the user identifier does not exist in the authorization server 201, it is determined whether the user identifier exists in the user information transfer destination table (S7.5). Table 4 shows an example of the user information transfer destination table to be referred to in the determination.

  The user information transfer destination table has columns of a user identifier and a transfer destination token end point. The transfer destination token endpoint is a token end point URL of the transfer destination authorization server when the user information is moved to the authorization server in a different region.

  In S7.5, specifically, it is determined whether the user identifier “dXNlcjJAMTEwQUI” included in “sub” of the token assertion exists. When it is determined that the user identifier exists, the corresponding destination token endpoint is obtained, and a token response in which the destination token endpoint URL is described as "destination_url" is transmitted to the token provider 440 (S7.6). “Destination_url” is “user transfer destination information” described in the processing of FIG.

  If it is determined in S7.5 that the user identifier does not exist, the authorization server 201 transmits an error response to the token provider 440, and ends the processing.

  According to this embodiment, even when a token request is executed when the user information of the authorized user is transmitted to another authorization server, the process until the authorization token is obtained can be continued without performing authorization again. .

[Other Examples]
In the above embodiment, the form in which the authorization request is transmitted to the authorization server 200 that is geographically close to the token provider 440 (the client 400) by using the Geo Routing function has been described. This is because access time and the like are taken into consideration. However, as long as the authorization server shares the user affiliation region table (Table 3), the method of determining the destination of the authorization request does not matter.

  The object of the present invention is also achieved by executing the following processing. That is, a storage medium storing a program code of software for realizing the functions of the above-described embodiments is supplied to a system or an apparatus, and a computer (or CPU, MPU, or the like) of the system or the apparatus stores the program stored in the storage medium. This is the process of reading the code. In this case, the program code itself read from the storage medium realizes the function of the above-described embodiment, and the program code and the storage medium storing the program code constitute the present invention.

200 Authorization server 420 Client application 440 Token provider

Claims (13)

A client that sends an authorization request for the user to authorize the client to access the resource server,
Two or more authorization servers in different regions,
An information processing system including
The authorization server,
First specifying means for specifying a first authorization server where the user information of the user authorizing the access is located,
The client,
Based on the region information of the region, a second specifying means for specifying an authorization server present in the region,
Has,
The authorization server,
Along with receiving the authorization request, identify the first authorization server where the user information of the user authorizing the access is located by the first identification means, for the identified first authorization server First transmission means for transmitting an authentication request for authenticating the user,
The first authorization server,
Along with the authentication request being transmitted by the first transmission means, the user is authenticated, along with information indicating a first authorization server where the user information of the authenticated user is located as a transmission destination, the authorization A second transmission unit that transmits an authorization response that is a response to the request to the client,
The client,
Based on the authorization response transmitted by the second transmission unit, the second identification unit identifies the first authorization server, and for the identified first authorization server, accesses the resource server. A third transmitting means for transmitting a token request for requesting an authorization token for performing
The first authorization server,
Issuance means for issuing the authorization token in response to the token request transmitted by the third transmission means,
Information processing system having The client,
2. The information processing system according to claim 1, wherein an authorization token issued by the issuing unit is acquired, and the resource server is accessed using the acquired authorization token. The authorization request sent from the client to the authorization server,
The information processing system according to claim 1, wherein the information is transmitted from the client to a common URL via a Web browser, and is transmitted to any one of two or more authorization servers existing in different regions. The authorization request sent to the common URL is:
4. The information processing system according to claim 3, wherein the authorization request is transmitted to an authorization server that is geographically close to a client that has transmitted the authorization request. The first specifying means,
Managing the hash value of the user identifier for identifying the user and the first information associated with the region information of the first authorization server where the user information of the user exists,
A hash value of a user identifier included in the authentication request is calculated, and region information of the first authorization server is specified based on the calculated hash value and the first information. The information processing system according to any one of claims 1 to 4. The authorization response is
6. The information processing apparatus according to claim 1, further comprising information indicating the first authorization server as a destination and signature information of the information indicating the first authorization server as a destination. system. The first authorization server,
First management means for managing an encryption key for adding the signature information to the authorization response,
The client,
The information processing system according to claim 6, further comprising: a second management unit that manages a decryption key for verifying the signature information. The client,
Third management means for managing an encryption key for adding signature information to the authorization request, and the first authorization server,
A fourth management unit that manages a decryption key for verifying the signature information given to the authorization request,
The encryption key managed by the third management means is
Adding signature information to the token request for obtaining the authorization token,
The decryption key managed by the fourth management means,
The information processing system according to claim 1, wherein the signature information provided to the token request is verified. The decryption key managed by the fourth management means,
The information processing system according to claim 8, wherein the information processing system is shared by two or more authorization servers existing in the different regions. The authorization server,
Third specifying means for specifying a destination authorization server to which the user information has moved,
The client,
A first verification unit that verifies whether the authorization token is included in the response to the token request for acquiring the authorization token,
A second verification unit for verifying whether or not the response to the token request for acquiring the authorization token includes information on a destination of the user information specified by the third specification unit. ,
When the first verification unit determines that the authorization token is not included in the response to the token request,
10. The information processing system according to claim 1, wherein the second verification unit verifies whether a response to the token request includes information on the destination. When the response to the token request is verified by the second verification unit to include information on the destination,
The information processing system according to claim 10, wherein a token request for requesting the authorization token is transmitted to the destination. The third specifying means,
The information processing system according to claim 10, wherein the destination is specified using a user identifier included in a token request received from the client. A client that sends an authorization request for the user to authorize the client to access the resource server,
Two or more authorization servers in different regions,
An information processing system control method including:
The authorization server,
A first identification step of identifying a first authorization server where the user information of the user authorizing the access is located,
The client,
Based on the region information of the region, a second specifying step of specifying an authorization server present in the region,
Has,
The authorization server,
Along with receiving the authorization request, identify the first authorization server in which the user information of the user authorizing the access is located by the first identification step, for the identified first authorization server A first transmission step of transmitting an authentication request for authenticating the user,
The first authorization server,
Along with the authentication request being transmitted by the first transmission step, the user is authenticated, and together with information indicating a first authorization server where the user information of the authenticated user is located as a destination, the authorization is performed. A second transmission step of transmitting an authorization response that is a response to the request to the client,
The client,
Based on the authorization response transmitted by the second transmission step, the first identification server is identified by the second identification step, and the resource server is accessed for the identified first authorization server. A third sending step of sending a token request requesting an authorization token for
The first authorization server,
An issuing step of issuing the authorization token in response to the token request transmitted by the third transmitting step,
A control method for an information processing system having:

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