# Patent

## Title
Information sharing endpoint

## Abstract

An endpoint may share client information as part of a negotiation of a secure connection with an application such that connections terminated by the endpoint may have client information reported to the application. An endpoint may include termination points of communication, such as a proxy. For example, a client may connect to a load balancer through a protocol, such as transport layer security (TLS). By connecting to the load balancer, client data becomes known to the load balancer. The load balancer may then connect to an application server through TLS. During the negotiation phase of TLS, the load balancer may send client data using an extension to TLS. In some embodiments, the application may use the client data to determine whether or not to accept the client connection, such as client encryption parameters that indicate sufficient encryption strength.

## Background
CROSS-REFERENCES TO RELATED APPLICATIONS
This application is related to and incorporates by reference for all purposes the full disclosure of co-pending U.S. patent application Ser. No. 13/764,688, filed Feb. 11, 2013, entitled “USING SECURE CONNECTIONS TO IDENTIFY SYSTEMS”.
BACKGROUND
Application servers may provide a service to clients. For example, an application server may provide web-based email to clients. As a number of clients grow, the computing requirements also grow. Instead of a more powerful computer, groups of application servers may be used to service larger groups of clients. However, as the groups become larger, loads among servers may be unequal and secure communications may also be necessary. The complexity of the application servers may also increase with the increased number of application server interactions. This complexity may increase the vulnerability of application servers that are directly reachable on the Internet.
Load balancers may distribute load and reduce load on application servers while reducing exposure of the application servers. For example, a load balancer may distribute work evenly among multiple application servers and terminate secure communication protocols on behalf of application servers. In some data centers, load balancers may be impleted by virtual computing systems hosted by a computing resource provider. One side effect of this load balancing is that the load balancer relays information between the client and the application server, such that the application server and client may not directly communicate.



BRIEF DESCRIPTION OF THE DRAWINGS
Various embodiments in accordance with the present disclosure will be described with reference to the drawings, in which:
FIG. 1 shows an illustrative example of an information sharing endpoint in accordance with at least one embodiment;
FIG. 2 shows an illustrative example of a client identification system in accordance with at least one embodiment;
FIG. 3 shows an illustrative example of a client identification system in accordance with at least one embodiment;
FIG. 4 shows an illustrative example of another embodiment of a client identification system in accordance with at least one embodiment;
FIG. 5 shows an illustrative example of session identifiers in accordance with at least one embodiment;
FIG. 6 shows an illustrative example of a process that may be used to identify clients in accordance with at least one embodiment; and
FIG. 7 shows an illustrative example of a process that may be used to identify clients in accordance with at least one embodiment; and
FIG. 8 shows an illustrative example of a process that may be used to identify clients in accordance with at least one embodiment; and
FIG. 9 shows an illustrative example of an information sharing endpoint in accordance with at least one embodiment;
FIG. 10 shows an illustrative example of communication in network stacks using an information sharing endpoint in accordance with at least one embodiment;
FIG. 11 shows an illustrative example of a process that may be used to share information through an endpoint in accordance with at least one embodiment; and
FIG. 12 shows an illustrative example of a process that may be used to share information through an endpoint in accordance with at least one embodiment;
FIG. 13 shows an illustrative example of a process that may be used to share information through transport layer security in accordance with at least one embodiment; and
FIG. 14 illustrates an environment in which various embodiments can be implemented.



DETAILED DESCRIPTION
In the following description, various embodiments will be described. For purposes of explanation, specific configurations and details are set forth in order to provide a thorough understanding of the embodiments. However, it will also be apparent to one skilled in the art that the embodiments may be practiced without the specific details. Furthermore, well-known features may be omitted or simplified in order not to obscure the embodiment being described.
Techniques described and suggested herein include sharing client information by an endpoint as part of a negotiation of a secure connection with an application such that connections terminated by the endpoint may have client information reported to the application. An endpoint may include termination points of communication, such as a proxy. For example, a client may connect to a load balancer through a protocol, such as transport layer security (TLS). By connecting to the load balancer, client data becomes known to the load balancer. This client data may include TLS version, IP address, source IP address, source port, hostname, URL, cryptographic suite, TLS session information, client certificate or cryptographic operations in use, among others. The load balancer may then connect to an application server through TLS. During the negotiation phase of TLS, the load balancer may inform the application server by a TLS extension that client data is available. Using the TLS extension, the application server may request the client data. The load balancer may then send the client data using the TLS extension. After sending the client data, the negotiation may complete. In some embodiments, after the negotiation, the endpoint may relay information back and forth over the client and application server connections. In other embodiments, the application may use the client data to determine whether or not to accept the client connection, such as client encryption parameters that indicate sufficient encryption strength.
By sharing client data using an extension to a secure protocol, such as TLS, a back-end computing resource may be given information about the client that was disclosed to a connection endpoint, such as a load balancer, but is not directly available to computing resources that are served by the load balancer, such as an application server. In termination of a connection, information about the client may be disclosed to facilitate the connection. For example, in terminating a TLS connection from a client, a load balancer receives rich information about the client, including TLS version, IP address, source IP address, source port, hostname, URL, cryptographic suite, TLS session information, client certificate or cryptographic operations in use, among others. This information is not directly available to the computing resources that are served by the load balancer because the computing resources connect with the load balancer and not the client. However, the information may be disclosed to the computing resources that are served by the load balancer. For example, a load balancer may begin a TLS session to an application server using the extension by sending a ClientHello message with a message indicating that the load balancer has client information that it can disclose via the extension to TLS. The server may respond with a ServerHello message that also includes a request message for the client data that was indicated and a Server HelloDone message. The load balancer may respond with a ClientKey Exchange message that also includes the client data in an extension message. The rest of a TLS exchange may occur including a load balancer ChangeCipherSpec record, load balancer Finished Message, server ChangeCipherSpec message and Server Finished message. The extension to the TLS protocol may be more fully explored in FIG. 13. The TLS library may then pass the client data to the application, store the client data in a file or otherwise prepare the client data for consumption. This receipt of client data may be done without interrupting the higher level protocols, such as HTTP, in a transparent manner because the client data is transferred during TLS negotiation.
Some prior sharing protocols may use a protocol, such as TCP, differently than expected such that a client application is modified to parse these incoming headers differently than normal headers. Protocols may include HAProxy's PROXY protocol, HTTP X-Forwarded-For Header and Citrix® CIP packet. However, these information sharing protocols have access to some client information, such as the client TLS configuration. In contrast, an application using an extendable secure communication protocol, such as TLS extension, may learn about client network stack information from the TLS layer and below. For example a load balancer may choose to send information to an application server about client configuration of TLS, TCP, IP, Data Link and Physical layers.
Another advantage of using an extension to a secure protocol is that there may be backward compatibility to the protocol, such as TLS. If the TLS client does not recognize a message, the message may be safely ignored. For example, during the negotiation phase of a TLS message, a load balancer may include an extension message indicating that additional client data is available with a ClientHello message. If the application server does not recognize the extension message, the application server may continue with the protocol and not respond to the extension message. In the prior example, the server may send a ServerHello Message, Certificate Message and HelloDone message without responding to the extension message. The TLS connection may be set up without responding to the extension and the TLS protocol may secure messages between the load balancer and the application server.
It should be recognized that a server may have different forms. In some embodiments, a server may be a virtual server or server based hardware. For example, a virtual server may be an application server running in a virtual environment with a virtual machine. In another example, a server may be code directly manipulating hardware.
Turning now to FIG. 1, an illustrative example of an information sharing system 100 in accordance with at least one embodiment is shown. A client 102 may open a connection to an endpoint 104, which, in response, opens a secure connection 108 to an application 106. While the endpoint 104 negotiates the secure connection 108 with the endpoint 104, the endpoint 104 may send client information 110 to the application 106. In some embodiments, the application may make a decision using the client information 110.
For example, a web application may be configured to receive connections from a load balancer. The load balancer may receive a request to communicate over TLS from a client computing system, such as a laptop. The load balancer may negotiate the TLS protocol with the client computing system, including selecting a TLS protocol version, a CipherSuite and compression method. The load balancer may also track other information about the connection from the client including hostname, IP address, URL and other client attributes. In one embodiment, during or after the load balancer forms a connection with the client computing system and in response to the connection, the load balancer may form an extensible secure connection with the client and transfer the client data to the application server as part of the extensible secure connection. For example, the load balancer may request a connection with the application using the TLS protocol. Using an extension to the TLS protocol, such as a series of messages with message types that are added to TLS records, the load balancer may offer the client data to the application server, receive a confirmation to send the client data and send the client data. The client data may include supported TLS protocol versions, CipherSuites, compression methods, hostname, IP addresses and/or URLs. The application may then use this client data to make a decision. For example, a financial application may determine if the CipherSuite used by the client has strong enough encryption. If the decision was made on key length, a client request having encryption using a 40 bit key may be rejected, but an encryption method using a 256 bit key may be accepted.
In some embodiments, the load balancer will resume a connection rather than start a new connection. A resumed connection may use a session identifier, such as a session ID or session ticket, in the message to confirm prior computations and potentially skip steps in the negotiation phase of a secure protocol, such as the TLS protocol. A session identifier may allow a server-side of a secure protocol to store information about the state of the session for later retrieval. A session ID may be limited to values using up to 32 bits. Session tickets may contain more data and consequently may have more ability to store customer state. In the case of a session ID, options may be encoded into the session ID and/or the session ID may be used in a lookup table of the server-side computing resource to retrieve the session information. In the case of a session ticket, the options may be stored in the session ticket itself for further reference.
Turning now to FIGS. 2 and 3, a client identification system is shown in a first communication session when a session identifier is created (FIG. 2) and during a second communication session in which the session identifier is returned. A session identifier may be crafted such that it identifies characteristics of the first communication session and also the first client. For example, a TLS client ID or session ticket may be crafted with a client identifying portion. As secure connections, such as those negotiated by TLS, are performed by a library, the session identifier is often stored by the library. Attempts to clear an application cache, such as a browser, may not clear the library cache because the library may save the session identifiers to avoid recomputing cryptographic setup operations. This lack of clearing of the cache may allow a session identifier to persist beyond cache clearing events. As a session identifier may be reused between sessions, activities performed by the client may be correlated to a session identifier that includes a client identification portion.
By using the session identifier to correlate actions of a client, several advantages may be obtained. Using a session identifier that includes a client identification portion, actions that normally are performed by different people may be correlated to a single client. For example, sock puppeting, or the act of using multiple accounts to gain a larger voice may be correlated to a single account. Sock puppeting may corrupt useful feedback, such as product reviews as one person may be given multiple voices to drown out other legitimate voices.
Turning now to FIG. 2, an illustrative example of a client identification system 200 in accordance with at least one embodiment is shown. A client 202 may request a secure TLS 206 connection with a TLS endpoint 204 supporting an application 214. The TLS endpoint 204 may send session information 210 to the application 214, such as communication parameters that are discovered during the TLS connection request. The application may use this session information 210 to give client information to include as part of the session identifier 208. The session information 210 and client information 212 may be combined to form a session identifier 208. The session identifier 208 may then be sent to the client 202 for use in resuming a TLS session during a second request for a secure connection. After being given the session identifier, the secure connection may be finalized and communication may occur over TLS.
In one embodiment, the session information 210 indicates the session identifier is a TLS session ID. A TLS session ID is a set of bytes. In secure sockets layer version 2 (SSLv2) the session ID is 16 bytes. In secure sockets layer version 3/transport layer security version 1 (SSLv3/TLSv1), the session ID is 1 to 32 bytes. In an embodiment, not all of the bytes of the session ID are needed for session information. A set of bytes may be reserved for client information. For example, a load balancer may use 15 bytes for TLS session information. The remaining bytes may be used for client identification. In SSLv3/TLSv1, the remaining 17 bytes may be used for a client identifier. In some embodiments, this client identifier may be given by the application to the endpoint such that a client may have a consistent identifier across sessions. In another embodiment, all of the bytes may be used for session information. However, the application may influence connection decisions of the load balancer such that unique clients may be identified. For example, the TLS endpoint 204 may send session information 210 to the application 214. The application 214 may then send back a value to include as a random number in the session identifier.
In one embodiment, the session information 210 indicates the session identifier is a TLS session ticket. A TLS session ticket may store more information than a TLS session ID. A TLS session ticket may be used to store session information for a stateless TLS resume. As the TLS protocol does not state what is in the TLS session ticket, client identification information may be added to the TLS session ticket. In one embodiment, a client identifier may be a value that is used to identify one or more accounts. In another embodiment, a client identifier may be a set of identifiers that correlates with one or more visitors.
After the first communication session has completed, the client may request a second communication session with the endpoint, such as TLS endpoint 204, that services the application 214 as seen in FIG. 3. During the negotiation phase of the second secure connection 216, the client may request to resume a TLS connection and include the session identifier 208 that was given during the first connection described in FIG. 2. The TLS endpoint 204 may then separate the client information 212 from the session information 210 and send the client information 212 to the application 214. The TLS endpoint may then finish the secure connection negotiation and open the secure connection. The application 214 may use the client information to correlate current client actions with prior client actions. As a session identifier may survive changes that other identifiers may not, such as a location change or cache clearing, the session identifier may provide a way to determine returning clients.
Another advantage of using a session identifier to identify clients is that a client may be recognized across a distributed computing system 400, such as one seen in FIG. 4. For example, a client 402 that uses the TLS protocol may request a first secure connection 414 with a first load balancer 404 among a set of load balancers (represented by the ellipsis in between the load balancers 404). As part of the negotiation, the client may send session information 408 that describes capabilities and/or attributes of the client 402. The load balancer 404 may then forward the session information 408 to an application server 406 among a set of application servers. The application server 406 may return client information 410 to use to identify the client 402. The session information 408 and client information 410 may be combined into a session identifier 412 that is sent to the client 402. The session identifier 412 may have the primary purpose of enabling the client 402 to resume a secure session without repeating all of the cryptographic setup operations, but may also include a secondary purpose of identifying the client 402. The load balancer 404 may then finish the negotiation of the secure connection 414 and enable communication between the client 402 and the application server 406.
At some point after the first secure connection 414, the client may request a second secure connection 416 with a second load balancer 404. The client 402 may also send the session identifier 412 received during the negotiation of the first secure connection 414. The second load balancer 404 may separate the session identifier 412 into session information 408 and client information 410. The load balancer 404 may use the session information 408 to finish negotiation of the second connection 416. The load balancer 404 may also send the client information 410 to a second application server 406. The second application server 406 may use the client information to associate the prior actions, such as those occurring over the first secure connection 414, with current actions, such as those occurring over the second secure connection 416. As a session identifier 412 is not tied to an account, but to a host, any accounts connecting through the same client 402 may be associated by use of the client information 410 in the session identifier 412.
By using the session identifier to correlate actions of a client, several advantages may be obtained. Using a session identifier that includes a client identification portion, actions that normally are performed by different people may be correlated to a single client. For example, sock puppeting, or the act of using multiple accounts to gain a larger voice may be correlated to a single account. Sock puppeting may corrupt useful feedback, such as product reviews as one person may be given multiple voices to drown out other legitimate voices. During sock puppeting, a user may submit content under a first account, such as a favorable review, and then later log in under a different account and submit further content, such as a second favorable review. In another example, click fraud may be detected. An account performing advertising administration and/or management, such as adding advertising to a webpage, that also is used to click on advertisements at a later time may be detected by using the session identifier to identify a client.
Turning now to FIG. 5, an illustrative example of session identifiers in accordance with at least one embodiment are shown. In a first type of session identifier, a set of bytes may be used to represent a session and a client. For example, in a first TLS session ID 502, a session ID may have up to 32 bytes. A portion of the bytes may be allocated to a session value 504 and a portion to the client value 506. In a second type of session identifier, a set of bytes may also be used to represent a session and a client. However, the full set of bytes may be needed to represent the session parameters. For example, in a second TLS session ID 508, all of the bytes may be allocated to a session value 510. However, the session value may be crafted such that individual clients may be identified by the session value 510. This may be through a pseudo random number or modifying communication parameters such that a specific combination of parameters is unique alone or in combination with other client information. In another embodiment, a session identifier may include enough space to store client information alongside the session information. For example, a TLS session ticket 512 may be used. A session ticket 512 may have more space available than a TLS session ID, as a session ticket may be intended to be used in place of caching protocol information. As TLS does not define what is in the session ticket, but does allow that it may be passed as a blob of information, extra information, such as client information, may be added. In the embodiment shown, the session ticket 512 includes a session information portion 514 followed by a client information portion 516.
Turning now to FIG. 6, an illustrative example of a process that may be used to identify clients in accordance with at least one embodiment is shown. The process may be accomplished by a system, such as the one shown in FIG. 4 that includes a client 402, load balancer 404 and application server 406. A client 602 may request a secure connection with an endpoint that services an application server. The secure endpoint may respond to the request by sending 604 a session identifier to the client during negotiation of the secure connection. The session identifier may identify the client to the application server. The endpoint and client may then finish negotiation and complete the first request. The endpoint may then receive 606 a second request for a secure connection with the same client. As part of the negotiation of the second secure connection, the client identifier may be sent by the client 608 to the endpoint to avoid reperforming cryptographic setup operations. The endpoint may then identify 610 the client is the same client from before by the client identifier. In some embodiments, an application and the endpoint may be running on the same computing resource. In other embodiments, an application that identifies the client may be separate from the endpoint that negotiates the secure connection.
Some or all of the process 600 (or any other processes described herein, or variations and/or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions and may be implemented as code (e.g., executable instructions, one or more computer programs or one or more applications) executing collectively on one or more processors, by hardware or combinations thereof. The code may be stored on a computer-readable storage medium, for example, in the form of a computer program comprising a plurality of instructions executable by one or more processors. The computer-readable storage medium may be non-transitory.
Turning now to FIG. 7, an illustrative example of a process that may be used to identify clients in accordance with at least one embodiment is shown. The process may be accomplished by a system, such as the one shown in FIG. 4 that includes a client 402, load balancer 404 and application server 406. A client may request 702 a first secure connection using the TLS protocol with a load balancer servicing one or more servers. The load balancer may determine 704 whether the client supports resumed connections with TLS session ID and/or TLS session ticket. If session tickets are available 706, the load balancer may send 714 a request to the server for client identification information. The request may include information about the client, such as session information. The server may respond and send information that the load balancer may use to compose 716 a session ticket based at least in part on client identifying information and session settings. The session ticket may then be sent to the client 718 and the negotiation of the first secure connection may be followed 720 to a finish. On the other hand, if a session ID is available 706, the load balancer may request 708 a server send client identification information to include as part of the TLS session ID. After receiving the client identification information, the load balancer may compose 710 the TLS session ID based at least in part on the client identification information and settings of the TLS session. The TLS session ID may then be sent 712 to the client as part of the negotiation. The negotiation of the first connection may then be finished 720.
After the first secure connection has completed, a client may request 722 a second TLS connection. The client may use 724 the session identifier previously received in a request to resume TLS communications. If the client identifier is 726 a TLS session ticket, the client identification portion may be split out 730 and sent 732 to a server to identify the client. If the client identifier is 726 a TLS session ID, the client identifier portion of the session ID may be determined 728 and sent to the server 732 to identify the client. The second connection may then be finished and the load balancer may then relay communications between the client and the server over the second TLS connection.
Turning now to FIG. 8, an illustrative example of a process that may be used to identify clients in accordance with at least one embodiment is shown. The process may be accomplished by a system, such as the one shown in FIG. 4 that includes a client 402, load balancer 404 and application server 406. An application may receive 802 a request from an endpoint for a client identifier given session information. The application may determine 804 an association of the session information to a client. In some embodiments, this association may be an account. In other embodiments, this association may be a visitor. In an embodiment, this association may be a combination of accounts and/or visitors. Using the session information, such as whether session tickets and/or session IDs are supported, a client identifier may be determined 806 and sent 808 to the client endpoint to include in the session identifier. Usage of the client may then be monitored 810. The client may make a request to resume a second TLS connection in which the client identifier is separated from the session identifier by the endpoint and received 812 by the application from the endpoint. Actions of the client may then be associated 814 with both actions during the first connection and the second connection.
Turning now to FIGS. 9 to 13, an information sharing endpoint is discussed. The information sharing endpoint may use information gathered during a connection to a client to pass through a secure protocol during a negotiation phase. As the information is passed during the negotiation phase of the secure protocol, an application need not be rewritten to understand information passed during the negotiation phase of the secure protocol. In some embodiments, an extensible secure protocol is used. An extensible secure protocol, such as TLS, allows an endpoint to ignore extension information without breaking the original protocol. For example, an application server may safely ignore an offer for client information during TLS negotiation and still complete a secure connection. By passing client information during negotiation, the endpoint may also allow an application to make a decision on the client information obtained while negotiating TLS with the client. Previously, a load balancer may have had to make decisions based on TLS information.
Turning now to FIG. 9, an illustrative example of an information sharing endpoint in accordance with at least one embodiment is shown. A client 902 may make a secure connection 910 with an endpoint 904 servicing an application 906. During the negotiation of the secure connection 910, a client may disclose client connection parameters 908, including TLS version, IP address, source IP address, source port, hostname, URL, cryptographic suite, TLS session information, client certificate or cryptographic operations in use, among others. The endpoint 904 may compose an extension message 912 based on the client connection parameters 908 using an extension to a secure protocol, such as TLS. The endpoint 904 may then negotiate a secure connection 914 with an application 906 using the secure protocol. During the negotiation, the extension message 912 may be sent to the application 906. The application 906 may cause a decision 916 to be implemented based on the information in the extension message 912. For example, the application may make a decision 916 on whether to allow the endpoint 904 to accept the client 902 connection. Depending on the embodiment, the endpoint 904 may complete the negotiation of the client secure connection 910 before, after or during the communication of the extension message to the application 906.
For example, a web browser client may send a request to connect with a web application using TLS that is serviced by a load balancer acting as an endpoint 904 for TLS. The web browser may disclose connection parameters 908, including TLS version, IP address, source IP address, source port, hostname, URL, cryptographic suite, TLS session information, client certificate or cryptographic operations in use, among others to facilitate the TLS connection. The load balancer may finish negotiating the TLS connection with the client normally. The load balancer may also request a TLS connection with the web application. In some embodiments, the load balancer may request to resume a TLS connection with the web application. As part of the TLS request, the load balancer may provide the client connection parameters 908 as an extension message 912 to the TLS negotiation. The load balancer may then complete the negotiation with the web application and open the secure connection 914. The web application may receive a request to open a pay by credit card page from the client. Using the client connection parameters 908 from the extension message 912, the web application may discover that the client is using a 40 bit key and make a decision 916 to deny the page request because of the low security of a 40 bit key.
In some embodiments, the endpoint 904 may be viewed as having a client-side terminator and a back-end side terminator. The client-side terminator may construct secure connections with the client 902 and collect details about the client 902 and/or the secure connection 910 with the client 902. The client side terminator of the endpoint 904 may pass this client information to the back-end side terminator. In response, the back-end side terminator may request a secure connection 914 with the application 906. During the negotiation of the secure connection 914, the back-end side terminator may send the client information to the application 906 using an extension to a protocol used by the secure connection 914, such as an extension message with a ClientHello message in a TLS protocol.
In some embodiments, an N-tier structure may be formed by repeating the communication of client information between tiers. For example, a four tier structure may include a client communicating with a firewall over a first connection, the firewall communicating over a second secure connection to a security device, the security device communicating with a load balancer over a third secure connection, the load balancer further communicating with a back-end server over a fourth secure connection. Each secure connection may be used to communicate client information as described above. The client information may be relayed from firewall to security device to load balancer to back-end server which may receive the client information and/or make decisions based at least in part on the client information.
Turning now to FIG. 10, an illustrative example of communication in network stacks using an information sharing endpoint in accordance with at least one embodiment is shown. Similar to FIG. 11, a client 1002 communicates with an endpoint 1004 that services an application server 1006. The network stacks of the endpoint 1004 and application server 1006 are shown to emphasize the layer at which information is passed using an extension to the TLS protocol. In the embodiment shown, a client 1002 connects to an endpoint 1004, such as a load balancer, using transport layer security connection 1008. Rich client information 1012 about this TLS connection is available to the endpoint because the endpoint uses this information to negotiate a TLS connection 1008 and communicate with the client 1002. However, this client information 1012 stops with the endpoint 1004 because the endpoint 1004 connects with the application server 1006. As there is no direct link from the client 1002 to the application server 1006, the application server 1006 does not have direct access to the client information 1012. This lack of client information may be remedied by sending the client information 1012 from the endpoint 1004 to the application server 1006. In one embodiment, by using a TLS extension, 1010, the client information 1012 may be sent during a TLS negotiation that is processed by a TLS library. If the application server TLS support does not recognize the extension, an offer to send client information 1012 may be safely ignored. The endpoint 1004 may include a TLS terminator that services a connection with the client 1002 and a TLS initiator that constructs a connection with the Application Server 1006. An example of a TLS terminator may include a TLS server daemon. An example of a TLS initiator may include a TLS client library.
A network stack may be used to simplify the passing of information from application to application over a network link. Each element of the stack may pass information up or down through the stack while providing the service for which it is intended. Messages may originate with an application layer 1014 and 1028. The message may then be passed through HTTP 1016 and 1030 which is a request-response protocol where a resource is identified by a URL. After passing through HTTP, the message passes through a TLS layer 1018 and 1032 in which a secure connection is negotiated with a server identified using HTTP. During this negotiation, the client information 1012 may be passed along using a TLS extension. The TLS layer may then pass encrypted data and destination information to a TCP layer 1020 and 1034 which manages packets to provide reliable ordered delivery of a stream of packets. The TCP layer may pass the data to the IP layer 1022 and 1036 which composes and routes network packets from the data. The link layer 1024 and 1038 then translates the packets to use protocols, such as Ethernet, over the physical layer 1026 and 1040, such as a wire between a computing resource and a switch. The data may be received by a destination's network stack and moved back up the network stack, removing the layer protocol information until an application layer 1014 or 1028 receives the data.
An advantage of using TLS is that TLS is not often controlled by an application, as it is meant to be transparent. With HTTP, HTTP may be manipulated and directly accessed by applications. A change in HTTP protocol may require editing of an application to anticipate possibilities of different protocol states with and without client information. With TLS, extensions may be safely ignored. Thus an offer to send client information 1012 may be ignored by an application using a version of TLS that does not support a client information distribution extension. Another advantage of TLS is that TLS extensions may allow the client information size to be larger than if performed in layers below the TLS layer.
Turning now to FIG. 11, an illustrative example of a process that may be used to share information through an endpoint in accordance with at least one embodiment is shown. A system such as the one seen in FIG. 9 may perform this process 1100, including a client 902, endpoint 904 and application 906. An endpoint may receive 1102 a request for a first connection with a client. The endpoint may construct 1104 the first connection with the client. The endpoint may request to construct 1106 a second secure connection with a server supported by the endpoint. During the negotiation of the second secure connection, the endpoint may send 1108 the client information from the first connection to the server using the secure protocol.
For example, the second secure connection may be using TLS as seen in FIG. 12 using a process 1200 to share information. The endpoint may be a load balancer and the application may be a financial application. The load balancer may receive 1202 a request for a connection with a client, such as using TLS. The load balancer may construct 1204 the first connection with the client. In response to constructing the first connection, the load balancer may request 1206 a second secure connection using TLS with an application server. The load balancer may compose 1208 a TLS extension message that includes client information determined from the first connection. During negotiation of the TLS connection between the load balancer and the application server, the load balancer may use a TLS extension to send 1210 the TLS extension message. The load balancer and application server may then finish 1212 the negotiation. The load balancer may then relay 1214 information between the client and the application server over the secure connections.
Turning now to FIG. 13, an illustrative example of a process that may be used to share information through a transport layer security protocol in accordance with at least one embodiment is shown. A system such as one seen in FIG. 9 may perform this process 1300, including a client 902, endpoint 904 and application 906. Following the TLS protocol, a load balancer sends 1302 a ClientHello message and sends 1304 an indication of available client data using a TLS extension message. The ClientHello message may include a supported TLS protocol version, a random number, available CipherSuites and available compression methods. The application server sends 1306 a ServerHello message that may include a chosen protocol version, a random number, a selected CipherSuite and a selected compression method. The server then sends 1308 a certificate message. The server may also send 1310 a request for client data as an extension to TLS protocol. The server may then send 1312 a HelloDone message indicating that the server is done with a handshake portion of the TLS protocol. The load balancer may then send 1314 the client information in an extension message. The load balancer may then send 1316 a ClientKeyExchange message which may contain a value or nothing depending on the selected CipherSuite. The load balancer may then send a ChangeCipherSpec record indicating 1318 that future messages will be encrypted. The load balancer may then send a Finished message 1320 that is encrypted and/or authenticated. The server may then send 1322 a ChangeCipherSpec message that indicates that future messages will be encrypted. The server may then send a Finished message that is encrypted and/or authenticated, after which an application phase may begin in which messages from layers above the TLS layer may be passed, such as HTTP and/or application layer messages as seen in FIG. 10.
While transport layer security (TLS) has been used herein for descriptive purposes, it should be recognized that other extensible secure protocols may be used.
It should be recognized that a client may be a computing resource configured to interact with a second computing resource. For example, a client may be a web browser that accesses a web application using transport layer security.
FIG. 14 illustrates aspects of an example environment 1400 for implementing aspects in accordance with various embodiments. As will be appreciated, although a Web-based environment is used for purposes of explanation, different environments may be used, as appropriate, to implement various embodiments. The environment includes an electronic client device 1402, which can include any appropriate device operable to send and receive requests, messages or information over an appropriate network 1404 and convey information back to a user of the device. Examples of such client devices include personal computers, cell phones, handheld messaging devices, laptop computers, set-top boxes, personal data assistants, electronic book readers and the like. The network can include any appropriate network, including an intranet, the Internet, a cellular network, a local area network or any other such network or combination thereof. Components used for such a system can depend at least in part upon the type of network and/or environment selected. Protocols and components for communicating via such a network are well known and will not be discussed herein in detail. Communication over the network can be enabled by wired or wireless connections and combinations thereof. In this example, the network includes the Internet, as the environment includes a Web server 1406 for receiving requests and serving content in response thereto, although for other networks an alternative device serving a similar purpose could be used as would be apparent to one of ordinary skill in the art.
The illustrative environment includes at least one application server 1408 and a data store 1410. It should be understood that there can be several application servers, layers, or other elements, processes or components, which may be chained or otherwise configured, which can interact to perform tasks such as obtaining data from an appropriate data store. As used herein the term “data store” refers to any device or combination of devices capable of storing, accessing and retrieving data, which may include any combination and number of data servers, databases, data storage devices and data storage media, in any standard, distributed or clustered environment. The application server can include any appropriate hardware and software for integrating with the data store as needed to execute aspects of one or more applications for the client device, handling a majority of the data access and business logic for an application. The application server provides access control services in cooperation with the data store, and is able to generate content such as text, graphics, audio and/or video to be transferred to the user, which may be served to the user by the Web server in the form of HyperText Markup Language (“HTML”), Extensible Markup Language (“XML”) or another appropriate structured language in this example. The handling of all requests and responses, as well as the delivery of content between the client device 1402 and the application server 1408, can be handled by the Web server. It should be understood that the Web and application servers are not required and are merely example components, as structured code discussed herein can be executed on any appropriate device or host machine as discussed elsewhere herein.
The data store 1410 can include several separate data tables, databases or other data storage mechanisms and media for storing data relating to a particular aspect. For example, the data store illustrated includes mechanisms for storing production data 1412 and user information 1416, which can be used to serve content for the production side. The data store also is shown to include a mechanism for storing log data 1414, which can be used for reporting, analysis or other such purposes. It should be understood that there can be many other aspects that may need to be stored in the data store, such as for page image information and to access right information, which can be stored in any of the above listed mechanisms as appropriate or in additional mechanisms in the data store 1410. The data store 1410 is operable, through logic associated therewith, to receive instructions from the application server 1408 and obtain, update or otherwise process data in response thereto. In one example, a user might submit a search request for a certain type of item. In this case, the data store might access the user information to verify the identity of the user, and can access the catalog detail information to obtain information about items of that type. The information then can be returned to the user, such as in a results listing on a Web page that the user is able to view via a browser on the user device 1402. Information for a particular item of interest can be viewed in a dedicated page or window of the browser.
Each server typically will include an operating system that provides executable program instructions for the general administration and operation of that server, and typically will include a computer-readable storage medium (e.g., a hard disk, random access memory, read only memory, etc.) storing instructions that, when executed by a processor of the server, allow the server to perform its intended functions. Suitable implementations for the operating system and general functionality of the servers are known or commercially available, and are readily implemented by persons having ordinary skill in the art, particularly in light of the disclosure herein.
The environment in one embodiment is a distributed computing environment utilizing several computer systems and components that are interconnected via communication links, using one or more computer networks or direct connections. However, it will be appreciated by those of ordinary skill in the art that such a system could operate equally well in a system having fewer or a greater number of components than are illustrated in FIG. 14. Thus, the depiction of the system 1400 in FIG. 14 should be taken as being illustrative in nature, and not limiting to the scope of the disclosure.
The various embodiments further can be implemented in a wide variety of operating environments, which in some cases can include one or more user computers, computing devices or processing devices which can be used to operate any of a number of applications. User or client devices can include any of a number of general purpose personal computers, such as desktop or laptop computers running a standard operating system, as well as cellular, wireless and handheld devices running mobile software and capable of supporting a number of networking and messaging protocols. Such a system also can include a number of workstations running any of a variety of commercially-available operating systems and other known applications for purposes such as development and database management. These devices also can include other electronic devices, such as dummy terminals, thin-clients, gaming systems and other devices capable of communicating via a network.
Most embodiments utilize at least one network that would be familiar to those skilled in the art for supporting communications using any of a variety of commercially-available protocols, such as Transmission Control Protocol/Internet Protocol (“TCP/IP”), Open System Interconnection (“OSI”), File Transfer Protocol (“FTP”), Universal Plug and Play (“UpnP”), Network File System (“NFS”), Common Internet File System (“CIFS”) and AppleTalk. The network can be, for example, a local area network, a wide-area network, a virtual private network, the Internet, an intranet, an extranet, a public switched telephone network, an infrared network, a wireless network and any combination thereof.
In embodiments utilizing a Web server, the Web server can run any of a variety of server or mid-tier applications, including Hypertext Transfer Protocol (“HTTP”) servers, FTP servers, Common Gateway Interface (“CGI”) servers, data servers, Java servers and business application servers. The server(s) also may be capable of executing programs or scripts in response requests from user devices, such as by executing one or more Web applications that may be implemented as one or more scripts or programs written in any programming language, such as Java®, C, C# or C++, or any scripting language, such as Perl, Python or TCL, as well as combinations thereof. The server(s) may also include database servers, including without limitation those commercially available from Oracle®, Microsoft®, Sybase® and IBM®.
The environment can include a variety of data stores and other memory and storage media as discussed above. These can reside in a variety of locations, such as on a storage medium local to (and/or resident in) one or more of the computers or remote from any or all of the computers across the network. In a particular set of embodiments, the information may reside in a storage-area network (“SAN”) familiar to those skilled in the art. Similarly, any necessary files for performing the functions attributed to the computers, servers or other network devices may be stored locally and/or remotely, as appropriate. Where a system includes computerized devices, each such device can include hardware elements that may be electrically coupled via a bus, the elements including, for example, at least one central processing unit (“CPU”), at least one input device (e.g., a mouse, keyboard, controller, touch screen or keypad), and at least one output device (e.g., a display device, printer or speaker). Such a system may also include one or more storage devices, such as disk drives, optical storage devices, and solid-state storage devices such as random access memory (“RAM”) or read-only memory (“ROM”), as well as removable media devices, memory cards, flash cards, etc.
Such devices also can include a computer-readable storage media reader, a communications device (e.g., a modem, a network card (wireless or wired), an infrared communication device, etc.) and working memory as described above. The computer-readable storage media reader can be connected with, or configured to receive, a computer-readable storage medium, representing remote, local, fixed and/or removable storage devices as well as storage media for temporarily and/or more permanently containing, storing, transmitting and retrieving computer-readable information. The system and various devices also typically will include a number of software applications, modules, services or other elements located within at least one working memory device, including an operating system and application programs, such as a client application or Web browser. It should be appreciated that alternate embodiments may have numerous variations from that described above. For example, customized hardware might also be used and/or particular elements might be implemented in hardware, software (including portable software, such as applets) or both. Further, connection to other computing devices such as network input/output devices may be employed.
Storage media and computer readable media for containing code, or portions of code, can include any appropriate media known or used in the art, including storage media and communication media, such as but not limited to volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage and/or transmission of information such as computer readable instructions, data structures, program modules or other data, including RAM, ROM, Electrically Erasable Programmable Read-Only Memory (“EEPROM”), flash memory or other memory technology, Compact Disc Read-Only Memory (“CD-ROM”), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices or any other medium which can be used to store the desired information and which can be accessed by the a system device. Based on the disclosure and teachings provided herein, a person of ordinary skill in the art will appreciate other ways and/or methods to implement the various embodiments.
The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense. It will, however, be evident that various modifications and changes may be made thereunto without departing from the broader spirit and scope of the invention as set forth in the claims.
Other variations are within the spirit of the present disclosure. Thus, while the disclosed techniques are susceptible to various modifications and alternative constructions, certain illustrated embodiments thereof are shown in the drawings and have been described above in detail. It should be understood, however, that there is no intention to limit the invention to the specific form or forms disclosed, but on the contrary, the intention is to cover all modifications, alternative constructions and equivalents falling within the spirit and scope of the invention, as defined in the appended claims.
The use of the terms “a” and “an” and “the” and similar referents in the context of describing the disclosed embodiments (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The terms “comprising,” “having,” “including,” and “containing” are to be construed as open-ended terms (i.e., meaning “including, but not limited to,”) unless otherwise noted. The term “connected” is to be construed as partly or wholly contained within, attached to, or joined together, even if there is something intervening. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided herein, is intended merely to better illuminate embodiments of the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.
Preferred embodiments of this disclosure are described herein, including the best mode known to the inventors for carrying out the invention. Variations of those preferred embodiments may become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventors expect skilled artisans to employ such variations as appropriate, and the inventors intend for the invention to be practiced otherwise than as specifically described herein. Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.
All references, including publications, patent applications and patents, cited herein are hereby incorporated by reference to the same extent as if each reference were individually and specifically indicated to be incorporated by reference and were set forth in its entirety herein.

## Claims

1. A computer-implemented method for connection negotiation, comprising:
receiving, by a connection endpoint server, a request by a client device to access an application server using a transport layer security (TLS) protocol, the application server being separate from the connection endpoint server;
negotiating a first connection between the client device and the connection endpoint server, the connection endpoint server receiving at least one client data parameter from the client device during the negotiation, the client data parameter including an indication identifying the-client device;
composing, based at least in part on the negotiated first connection, a transport layer security session identifier having a session information portion and a client information portion, the client information portion including the indication identifying the client device;
constructing the first connection between the client device and the connection endpoint server;
requesting, by the connection endpoint server, a second connection between the application server and the connection endpoint server using the TLS protocol in response to the first connection;
during a negotiation of the second connection:
passing an extended client hello message including an indication of availability of the transport layer security session identifier to the application server using an extended TLS protocol;
receiving a request from the application server for at least a portion of the information in the transport layer security session identifier, the portion of the information comprising the indication identifying the client device; and
upon receiving the request from the application server for the transport layer security session identifier, providing at least the portion of the information in the transport layer security session identifier to the application server, wherein the portion of the information is utilized by the application server to perform a function of the application server; and

relaying information between the client device and the application server over the first connection and the second connection.

2. The computer-implemented method of claim 1, wherein the passing the extended client hello message using the extension to TLS further comprises defining a handshake message type to use with a handshake message containing the at least one client data parameter.

3. The computer-implemented method of claim 1, wherein passing the at least one client data parameter further comprises TLS version, IP address, IP version, source IP address, source port, destination IP address, destination port, hostname, URL, cryptographic suite, TLS session information, client certificate, compression methods or cryptographic operations in use.

4. The computer-implemented method of claim 1, wherein requesting the second connection with the server is a resumed handshake, reusing cryptographic parameters that were previously negotiated.

5. The computer-implemented method of claim 1, further comprising determining, by the server, to refuse an operation requested by the client based at least in part on the at least one client data parameter.

6. The computer-implemented method of claim 5, wherein determining to refuse an operation further comprises determining, by the server, to refuse a financial operation based at least in part on the encryption strength of the first connection.

7. The computer-implemented method of claim 1, wherein the request from the application server for the transport layer security session identifier comprises a request for the indication identifying the client device within the client information portion of the transport layer security session identifier.

8. A computer-implemented method for information sharing, comprising:
receiving, by one or more computer systems, a request for a first connection with a client device;
negotiating, by the one or more computer systems with the client device, a set of parameters to be used in constructing the first connection, the set of parameters including client information;
constructing the first connection with the client device in accordance with the set of parameters;
composing, based at least in part on the constructed first connection, a session identifier having a session information portion and a client information portion, the client information portion including the set of parameters;
requesting a second secure connection with a server, the secure connection being implemented using an extended encryption protocol, the extended encryption protocol including an indication that the client information is available; and
during a negotiation of the second secure connection:
receiving, from the server, a request for the client information; and
conveying the session identifier to the server via the extended encryption protocol, wherein the set of parameters is extracted from the session identifier by the server and used to perform a function of the server.

9. The computer-implemented method of claim 8, wherein conveying the session identifier to the server is performed as a part of the negotiation.

10. The computer-implemented method of claim 9, wherein the extended encryption protocol comprises a transport layer security (TLS) protocol.

11. The computer-implemented method of claim 10, wherein extending the encryption protocol comprises using an extension to the TLS.

12. The computer-implemented method of claim 8, wherein conveying the session identifier to the server further comprises passing one or more parameters used by a network stack for the first connection with the client device.

13. The computer-implemented method of claim 8, wherein requesting a second secure connection comprises requesting to resume the second secure connection.

14. The computer-implemented method of claim 10, wherein constructing the first connection with the client device is performed by a load balancer and wherein requesting a second secure connection with a server is performed by the load balancer.

15. The computer-implemented method of claim 8, wherein the set of parameters comprises TLS version, IP version, IP address, source IP address, source port, destination IP address, destination port, hostname, URL, cryptographic suite, TLS session information, client certificate, compression methods or cryptographic operations in use.

16. The computer-implemented method of claim 8 further comprising:
requesting, by the server, a third secure connection with a second server; and
during a negotiation of the third secure connection, conveying the client information to the second server.

17. The computer-implemented method of claim 16 wherein:
the first connection is between a client and a firewall;
the second secure connection is between a firewall and a load balancer; and
the third secure connection is between a load balancer and an application server.

18. A computer system for communicating client information, comprising:
one or more computing resources having one or more processors and memory including executable instructions that, when executed by the one or more processors, cause the one or more processors to implement at least:
a client-facing endpoint terminator that terminates a first secure connection between a client device and the client-facing endpoint terminator, the client-facing endpoint terminator gathering client information from the first secure connection during a setup of the first secure connection, the client information including an indication of the client device, the client-facing endpoint terminator further generating a session identifier that includes information related to the first secure connection and the client information; and
a back-end endpoint initiator that terminates a second secure connection between a back-end server and the back-end endpoint initiator based at least in part on the first secure connection, the second secure connection utilizing an encryption protocol, the back-end endpoint initiator configured to advertise an availability of the client information to the back-end server, the back-end endpoint initiator further configured to send the generated session identifier to the back-end server during a setup of the second secure connection within an extension to the encryption protocol upon receiving a request from the back-end server for the client information, wherein the client information is subsequently used by the back-end server to perform a function of the back-end server.

19. The computer system of claim 18, wherein the extension to the encryption protocol is a TLS protocol extension specifying a message type of the transport layer security protocol.

20. The computer system of claim 18, further comprising a load balancer on which the back-end endpoint initiator and client-facing endpoint terminator are hosted.

21. The computer system of claim 18, further comprising the back-end server that receives the sent session identifier using the extension to the encryption protocol to determine whether to allow a client request based at least in part on the sent client information.

22. The computer system of claim 21, wherein the back-end server is an application server.

23. One or more non-transitory computer-readable storage media having collectively stored thereon executable instructions that, when executed by one or more processors of a computer system, cause the computer system to at least:
receive a request for a first connection from an endpoint using a first secure protocol; and
during a negotiation phase of a second connection according to the first secure protocol, receive a set of parameters that describe the second connection, the second connection between the endpoint and a client device, the set of parameters including an indication of the client device;
compose a session identifier having a session information portion and a client information portion, the client information portion including the set of parameters;
establish, using the first secure protocol, a third connection between the endpoint and an application server, an indication of the availability of the set of parameters being sent to the application server in an extended client hello message;
in response to receiving a request from the application server for the set of parameters, provide the session identifier to the application server during a negotiation phase of the third connection in an extension to the first secure protocol, wherein the set of parameters is extracted from the session identifier by the application server and used to execute an application maintained on the application server; and
forward at least one data packet received from the client device over the second connection to the application server over the third connection.

24. The non-transitory computer-readable storage media of claim 23, wherein receiving the set of parameters that describes a second connection further comprises receiving the set of parameters in a transport layer security protocol extension as a message defined by a message type to include the set of parameters.

25. The non-transitory computer-readable storage media of claim 23, wherein the instructions further comprise instructions that, when executed, cause the computer system to at least receive information from the client as relayed by the endpoint over the first connection.

26. The non-transitory computer-readable storage media of claim 23, wherein the instructions further comprise instructions that, when executed, cause the computer system to at least:
receive a request originating from the client over the first connection; and
determine whether to allow the request based at least in part on the set of parameters.

27. The non-transitory computer-readable storage media of claim 26, wherein the request is a payment request, wherein the set of parameters comprises a key size and wherein determining whether to allow the request further comprises determining whether to allow the request based at least in part on the key-size.