Abstract:
User authorization and access information may be stored in a remote assistant card or chassis management module (CMM). The CMM may be in communication with each baseboard management controller (BMC) in a blade server system. Each BMC may authenticate its authorized users from the CMM using a simple user authorization retrieval command, e.g., IPMI Get Auth Code command. When an administrator wants to add or delete a user, the CMM may be updated instead of having to update each blade BMC. Each user may have a privilege list for any or all of the blades in the blade server system. This privilege list may define which user(s) apply to which blades, input-output (I/O) modules, and/or blade server system chassis.

Description:
TECHNICAL FIELD  
       [0001]     The present disclosure relates generally to information handling systems and, more particularly, to information handling systems having authentication of baseboard management controller users in a blade server system.  
       BACKGROUND  
       [0002]     As the value and use of information continues to increase, individuals and businesses seek additional ways to process and store information. One option available to users are information handling systems. An information handling system generally processes, compiles, stores, and/or communicates information or data for business, personal, or other purposes, thereby allowing users to take advantage of the value of the information. Because technology and information handling needs and requirements vary between different users or applications, information handling systems may also vary regarding what information is handled, how the information is handled, how much information is processed, stored, or communicated, and how quickly and efficiently the information may be processed, stored, or communicated. The variations in information handling systems allow for information handling systems to be general or configured for a specific user or specific use such as financial transaction processing, airline reservations, enterprise data storage, or global communications. In addition, information handling systems may include a variety of hardware and software components that may be configured to process, store, and communicate information and may include one or more computer systems, data storage systems, and networking systems, e.g., computer, personal computer workstation, portable computer, computer server, print server, network router, network hub, network switch, storage area network disk array, RAID disk system and telecommunications switch.  
         [0003]     An information handling system is powered from a power supply system that receives and converts alternating current (AC) power to direct current (DC) power at utilization voltages required by the electronic modules comprising the information handling system. The power supply system tightly regulates these utilization voltages and incorporates over current protection for each of the voltages. To further provide increased reliability of the power supply system, a plurality of power supply units (PSU) may be provided and coupled in parallel so that the loss or malfunction of one or more of the PSUs will not totally disable operation of the information handling system.  
         [0004]     As consumer demand increases for smaller and denser information handling systems, manufacturers strive to integrate more computer components into a smaller space. This integration has led to the development of several applications, including high density servers. A high density server provides the computer processing resources of several computers in a small amount of space. A typical arrangement for a high density server includes a shared power supply system, a management module, a connection board (e.g., a back-plane or mid-plane) and server modules, such as blade server modules.  
         [0005]     Blade server modules, or “blades,” are miniaturized server modules that typically are powered from a common power supply system and are cooled by cooling system within a multi-server cabinet. Typically, a blade includes a circuit board with one or more processors, memory, a connection port, and possibly a disk drive for storage. By arranging a plurality of blades like books on a shelf in the multi-server cabinet, a high density multi-server system achieves significant cost and space savings over a plurality of conventional servers. These savings result directly from the sharing of common resources (e.g., power supplies, cooling systems, enclosures, etc.,) and the reduction of space required by this type of multi-server system while providing a significant increase in available computer processing power.  
         [0006]     Each blade may have a baseboard management controller (BMC). The BMC may offer an intelligent platform management interface (IPMI) having out-of-band (OOB) access over an interface port, e.g., local area network (LAN), serial over LAN (SOL), etc. This interface port may allow a user to locally or remotely manage the blade. Each BMC may have a database for storing all user information required for remote access authentication.  
       SUMMARY  
       [0007]     If an administrator wants to add an additional user(s) to a blade server system, information for each user(s) has to be added to all of the BMCs, each of the BMCs being associated with a respective blade. However, due to cost constraints, a typical BMC has very limited resources, e.g., small electrically erasable and programmable memory (EEPROM), small Flash memory, etc. Therefore, the BMC may only store very small amounts of information about authorized users and does not have the capacity to offer more advanced user authentication, e.g., ACTIVE DIRECTORY® (a registered trademark of Microsoft Corp., One Microsoft Way, Redmond, Wash. 98052). Therefore what is needed is the ability to retain a sufficient amount of information so that advanced user authentication may be used for a plurality of users without increasing the cost and/or complexity of individual BMCs in a blade server system.  
         [0008]     According to teachings of this disclosure, information for all BMC users may be stored in a remote assistant card or chassis management module (hereinafter “CMM”). Only one CMM is required and may be in communication with all of the BMCs in the blade server system. Each BMC in the blade server system authenticates its authorized users from the CMM using a simple user authorization retrieval command, e.g., IPMI Get Auth Code command. The CMM may use non-volatile memory, e.g., EEPROM, Flash memory, etc., to store the authorized user information.  
         [0009]     When an administrator wants to add or delete a user, only the CMM need be updated instead of having to update each blade BMC. Each user may have a privilege list for any or all of the blades in the blade server system. This privilege list may define which user(s) apply to which blades, input-output (I/O) modules, and/or chassis. The privilege list may comprise a bit map with an appropriate number of bits for each piece of equipment and access level thereto. A BMC may authenticate an ACTIVE DIRECTORY® user through the CMM if this user&#39;s name includes domain information.  
         [0010]     It is contemplated and within the scope of this disclosure that rack mounted monolithic servers (individual standalone boxes) may use a common rack management system (RMS) that may function similarly to the CMM as described herein. Each BMC in a monolithic server may authenticate a user with the RMS through an out-of-band management network using, for example but not limited to, a simple user authorization retrieval command, e.g., IPMI Get Auth Code command.  
         [0011]     According to a specific example embodiment of this disclosure, an information handing system may comprise a method for authenticating baseboard management controller (BMC) user requests in a blade server system, comprising the steps of: receiving a request from a user to access a blade server in a blade server system, wherein the blade server system comprises a plurality of blade servers and each of the plurality of blade servers has a baseboard management controller (BMC); requesting verification of the user by the BMC of the blade server to a chassis management module (CMM); verifying the user with the CMM; authorizing the request by the user with the BMC if the user is verified by the CMM; and performing the authorized request by the blade server.  
         [0012]     According to another specific example embodiment of this disclosure, an information handing system may comprise a method for authenticating baseboard management controller (BMC) user requests in a server system, comprising the steps of: receiving a request from a user to access a server in a server system, wherein the server system comprises a plurality of servers and each of the plurality of servers has a baseboard management controller (BMC); requesting verification of the user by the BMC of the server to a rack management system (RMS); verifying the user with the RMS; authorizing the request by the user with the BMC if the user is verified by the RMS; and performing the authorized request by the server.  
         [0013]     According to yet another specific example embodiment of this disclosure, an information handing system may comprise a blade server system having central verification of users making requests thereto, said blade server system comprising: a plurality of blade servers, each of the plurality of blade servers having a baseboard management controller (BMC); and a chassis management module (CMM) coupled to each of the BMCs; wherein when a request is received from a user to access a one of the plurality of blade servers, the BMC of the one of the plurality of blade servers requests verification of the user by the CMM; and wherein if the CMM verifies the user then the BMC of the one of the plurality of blade servers authorizes the request by the user and the one of the plurality of blade servers performs the request.  
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0014]     A more complete understanding of the present disclosure thereof may be acquired by referring to the following description taken in conjunction with the accompanying drawings wherein:  
         [0015]      FIG. 1  is a schematic perspective view of a high density information handling blade server system, according to a specific example embodiment of the present disclosure;  
         [0016]      FIG. 2  is an information handling blade server system having electronic components mounted on at least one printed circuit board (PCB) (motherboard not shown) and communicating data and control signals therebetween over signal buses;  
         [0017]      FIG. 3  is a schematic flow diagram of a prior technology sequence of steps for authorizing a user request to a blade of a blade server system;  
         [0018]      FIG. 4  is a schematic flow diagram of a sequence of steps for authorizing a user access request to a blade by having the BMC of the requested blade obtain verification from a chassis management module (CMM) that the user has authorization to make the requested access to the blade, according to a specific example embodiment of the present disclosure;  
         [0019]      FIG. 5  is a schematic flow diagram of a sequence of steps for authorizing a user access request to a server by having the BMC of the requested server obtain verification from a rack management system (RMS) that the user has authorization to make the requested access to the server, according to a specific example embodiment of the present disclosure; and  
         [0020]      FIG. 6  is a schematic flow diagram of a sequence of steps for authorizing an administrator access to the chassis management module (CMM) and for updating a list of authorized user accesses to blades of the blade server system, according to a specific example embodiment of the present disclosure. 
     
    
       [0021]     While the present disclosure is susceptible to various modifications and alternative forms, specific example embodiments thereof have been shown in the drawings and are herein described in detail. It should be understood, however, that the description herein of specific example embodiments is not intended to limit the disclosure to the particular forms disclosed herein, but on the contrary, this disclosure is to cover all modifications and equivalents as defined by the appended claims.  
       DETAILED DESCRIPTION  
       [0022]     For purposes of this disclosure, an information handling system may include any instrumentality or aggregate of instrumentalities operable to compute, classify, process, transmit, receive, retrieve, originate, switch, store, display, manifest, detect, record, reproduce, handle, or utilize any form of information, intelligence, or data for business, scientific, control, or other purposes. For example, an information handling system may be a personal computer, a network storage device, or any other suitable device and may vary in size, shape, performance, functionality, and price. The information handling system may include random access memory (RAM), one or more processing resources such as a central processing unit (CPU), hardware or software control logic, read only memory (ROM), and/or other types of nonvolatile memory. Additional components of the information handling system may include one or more disk drives, one or more network ports for communicating with external devices as well as various input and output (I/O) devices, such as a keyboard, a mouse, and a video display. The information handling system may also include one or more buses operable to transmit communications between the various hardware components.  
         [0023]     Referring now to the drawings, the details of specific example embodiments are schematically illustrated. Like elements in the drawings will be represented by like numbers, and similar elements will be represented by like numbers with a different lower case letter suffix.  
         [0024]     Referring to  FIG. 1 , depicted is a schematic perspective view of a high density information handling blade server system, according to a specific example embodiment of the present disclosure. The information handling server system, generally represented by the numeral  200 , comprises at least one blade server module (BSM)  210 , a power distribution board (PDB)  202 , at least one power supply unit (PSU)  206 , and a chassis management module (CMM)  270 . In certain embodiments, one example of an information handling server system  200  includes a high density server system  200  that may form a part of a component rack system (not expressly shown). Typically, the high density server system  200  may include an enclosure or chassis  208  in which the at least one PSU  206 , CMM  270 , PDB  202  and the at least one BSM  210  may be enclosed therein. Each BSM  210  may include a blade management controller (BMC)  212  (see  FIG. 2 ).  
         [0025]     Although  FIG. 1  depicts a mid-plane PDB  202  as being placed between CMM  270  and the at least one BSM  210 , the PDB  202  may be located anywhere in the information handling system  200 , even external to the chassis  208 . In alternate embodiments, the PDB  202  may be located along the back of the information handling server system  200  and may be referred to as a power distribution back-plane (not shown).  
         [0026]     The high density server system  200  may be coupled to other computer components such as keyboards, video displays and pointing devices (not expressly shown). Typically, the information handling system  200  may include more than one PSU  206  such that a redundant power source may be provided. The PSU  206  may supply an output, e.g., an electrical voltage(s) for the at least one BSM  210 . Generally, the PSU  206  output is coupled through the PDB  202  for distribution to the at least one BSM  210 .  
         [0027]     Referring to  FIG. 2 , depicted is an information handling blade server system having electronic components mounted on at least one printed circuit board (PCB) (motherboard not shown) and communicating data and control signals therebetween over signal buses. In one example embodiment, the information handling server system is a computer blade server system. The information handling server system, generally referenced by the numeral  200 , may comprise one or more blade server modules (BSMs)  210   a - 210   m.  For each of the blade server modules (BSMs)  210   a - 210   m  (for illustrative purposes only components for BSM  210   a  are shown) there may be a processor(s)  211   a,  a north bridge  240   a,  which may also be referred to as a memory controller hub or a memory controller that is coupled to a main system memory  250   a,  and the blade management controller (BMC)  212   a.  The north bridge  240   a  is coupled to the processor(s)  210   a  via the host bus  220   a.  The north bridge  240   a  is generally considered an application specific chip set that provides connectivity to various buses, and integrates other system functions such as a memory interface. For example, an Intel 820E and/or 815E chip set, available from the Intel Corporation of Santa Clara, Calif., provides at least a portion of the north bridge  240   a.  The chip set may also be packaged as an application specific integrated circuit (ASIC). The north bridge  240   a  typically includes functionality to couple the main system memory  250   a  to other devices within the information handling system  100 . Thus, memory controller functions such as main memory control functions typically reside in the north bridge  240   a.  In addition, the north bridge  240   a  provides bus control to handle transfers between the host bus  220   a  and a second bus(es), e.g., PCI bus  270   a.  A third bus(es)  268   a  may also comprise other industry standard buses or proprietary buses, e.g., ISA, SCSI, I 2 C, SPI, USB buses through a south bridge(s) (bus interface)  262   a.    
         [0028]     Referring now to  FIG. 3 , depicted is a schematic flow diagram of a prior technology sequence of steps for authorizing a user request to a blade of a blade server system. In step  302 , a user requests access to a blade in a blade server system. In step  304  the BMC of the requested blade verifies whether the user is authorized to access the blade. If the user access is authorized then the user request is performed by the blade. Each BMC of a respective blade server must have all of the access authorization information for all of the users that may access the respective blade. This may require a great deal of non-volatile memory storage capacity for each BMC and authorization information for each user must be duplicated in each of the BMCs that the user(s) is authorized to access.  
         [0029]     Referring now to  FIG. 4 , depicted is a schematic flow diagram of a sequence of steps for authorizing a user access request to a blade by having the BMC of the requested blade obtain verification from a chassis management module (CMM) that the user has authorization to make the requested access to the blade, according to a specific example embodiment of the present disclosure. In step  402 , a user requests access to a blade  210  in a blade server system  200 . In step  404  the BMC  212  of the requested blade  210  requests the CMM  270  to verify that the user is authorized to access the blade  210 . In step  406 , if the user access is verified in the CMM  270  then in step  408  the BMC  212  authorizes the respective blade  210  to perform the user request. In step  410  the respective blade  210  performs the user request. Each BMC  212  only needs to request authorization from the CMM  270  of a user request for a particular blade  210 . No user authorization information has to be stored in each BMC  212 , only in the CMM  270  which is in common with and accessible to all of the BMCs  212  of the blade server system  200 . All user access authorizations may be located in the CMM  270 , thus reducing the amount of memory storage required in each of the BMCs  212 .  
         [0030]     Referring now to  FIG. 5 , depicted is a schematic flow diagram of a sequence of steps for authorizing a user access request to a server by having the BMC of the requested server obtain verification from a rack management system (RMS) that the user has authorization to make the requested access to the server, according to a specific example embodiment of the present disclosure. In step  502 , a user requests access to a monolithic server. In step  504  the BMC of the requested server requests the RMS to verify if the user is authorized to access the server. In step  506 , if the user access is verified in the RMS then in step  508  the BMC authorizes the respective server to perform the user request. In step  510  the server performs the user request. Each BMC only needs to request authorization from the RMS of a user request for a particular server. No user authorization information has to be stored in each BMC, only in the RMS which is in common with and accessible to all of the BMCs of the server system. All user access authorizations may be located in the RMS, thus reducing the amount of memory storage required in each of the BMCs.  
         [0031]     It is contemplated and within the scope of this disclosure that advanced authorization techniques, e.g., ACTIVE DIRECTORY®, may be utilized since all user verification and authorized access data may reside in the CMM or RMS.  
         [0032]     Referring now to  FIG. 6 , depicted is a schematic flow diagram of a sequence of steps for authorizing an administrator access to the chassis management module (CMM) and for updating a list of authorized user accesses to blades of the blade server system, according to a specific example embodiment of the present disclosure. In step  602 , an administrator requests access to the CMM  270 . In step  604 , the CMM  270  verifies that the administrator access is authorized. If the administrator access is found to be authorized in step  604 , then in step  606  the administrator may update the list of authorized user accesses stored in the CMM  270 .  
         [0033]     While embodiments of this disclosure have been depicted, described, and are defined by reference to example embodiments of the disclosure, such references do not imply a limitation on the disclosure, and no such limitation is to be inferred. The subject matter disclosed is capable of considerable modification, alteration, and equivalents in form and function, as will occur to those ordinarily skilled in the pertinent art and having the benefit of this disclosure. The depicted and described embodiments of this disclosure are examples only, and are not exhaustive of the scope of the disclosure.