What We Just Did to Make SSL Even Faster. Asked to referee a paper on a topic that I think another group is working on, Do i need a subpanel for a single circuit with less than 4 receptacles equaling less than 600 watt load. Taken from RFC5280, Section 8. Transport Layer Security § Applications and adoption, X.509 § Major protocols and standards using X.509 certificates, Server-based Certificate Validation Protocol, "How To Configure OCSP Stapling on Apache and Nginx", "Security Certificate Revocation Awareness: The case for "OCSP Must-Staple, "Windows XP Certificate Status and Revocation Checking", "What's New in Certificate Revocation in Windows Vista and Windows Server 2008", "Mozilla Bug 110161 – Enable OCSP by Default", "Apple users left to defend themselves against certificate attacks", "Introducing Extended Validation Certificates", "Chrome does certificate revocation better", "EJBCA – Open Source PKI Certificate Authority", "OpenXPKI project documentation^ CRL and OCSP extensions", Public Key Infrastructure: Operational Protocols, RFC 2560, X.509 Internet Public Key Infrastructure Online Certificate Status Protocol – OCSP, RFC 4806, Online Certificate Status Protocol (OCSP) Extensions to IKEv2, RFC 5019, The Lightweight Online Certificate Status Protocol (OCSP) Profile for High-Volume Environments, RFC 6960, X.509 Internet Public Key Infrastructure Online Certificate Status Protocol – OCSP, Processor.com April, 2009 article about Online Certificate Status Protocol, Transport Layer Security / Secure Sockets Layer, DNS-based Authentication of Named Entities, DNS Certification Authority Authorization, Automated Certificate Management Environment, Export of cryptography from the United States, https://en.wikipedia.org/w/index.php?title=Online_Certificate_Status_Protocol&oldid=1000221008, Creative Commons Attribution-ShareAlike License, Since an OCSP response contains less data than a typical certificate. OCSP does not, by itself, perform any DPV of supplied certificates. With the free SSL certificates by Let’s Encrypt and Google openly promoting HTTPS protocol over the more widespread, but unsecure HTTP one, more and more sites have started to use SSL certificates. You go to the issuer ’s OCSP responder over HTTPS. It is used for secure communication over a computer network, and is widely used on the Internet. OCSP response signing, OCSP request signing (when relaying OCSP requests), SSL Server key (when it is acting as the SSL server to OCSP clients), SSL client key (when it is acting as an SSL client to a back-end OCSP Responder which communicates over SSL). The requestorName and requestExtensions request fields are not included in the request. [...] Where privacy is Is there other way to perceive depth beside relying on parallax? OCSP is an effective way to check if key certficates are valid, but it presents some significant issues as well. The Online Certificate Status Protocol Is Just One Way to Check a Cert’s Revocation Status. Servers include (or staple) the cached OCSP response in their HTTPS responses alongside the SSL certificate itself. This recent news helped me to surface this old question. Carol's OCSP responder reads the certificate serial number from Bob's request. OCSP over HTTPS is technically non-working solution, because it requires a SSL certificate that is ussued by a another authority, because SSL certificate MUST be checked for revocation. rev 2021.1.21.38376, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. protected using either TLS/SSL or some other lower layer protocol. a requirement, OCSP transactions exchanged using HTTP MAY be Certificate Revocation is used within PKI (Public Key Infrastructure) to instruct the client that the certificate can no longer be trusted. There are two main ways to check the revocation status of a digital certificate — CRLs and OCSP. At worst, this situation can create However, OCSP certification checks are transmitted over port 80. If it cannot process the request, it may return an error code. Nexus OCSP Responder is a responder for the Internet Public Key Infrastructure (PKI) Online Certificate Status Protocol (OCSP). OCSP stapling allows web servers (instead of browsers) to obtain signed OCSP responses for their certificates, that can be cached for up to 7 days. Furthermore, everyone on the network path between your browser and the OCSP server will also know which sites you are browsing. Thanks for contributing an answer to Stack Overflow! On the Internet, I can find several statements done over the years claiming that serving a X.509 CRL over HTTPS is a bad practice because either. OCSP requests are sent over unencrypted HTTP and are tied to a specific certificate. To mitigate these issues, browsers and CAs came up with a new method of determining a certificate’s status, called OCSP Stapling. Online Certificate Status Protocol: An online certificate status protocol (OCSP) is one of the two protocols aside from certificate revocation lists (CRL) for maintaining the security of servers and other network resources. Using public key cryptography, we can be sure that only the encrypted d… your coworkers to find and share information. OCSP has a bit less overhead than CRL revocation. Sending an OCSP request tells the certificate authority which websites you are visiting. An attacker who has compromised a server's private key typically needs to be in a man-in-the-middle position on the network to abuse that private key and impersonate a server. The OCSP responder uses the certificate serial number to look up the revocation status of Alice's certificate. E.g. Currently, the way OCSP is implemented by browsers raises three major concerns: privacy, performance, and a potential point of failure. Bob uses Carol's public key to verify Carol's response. What are the odds that the Sun hits another star? OCSP uses OCSP responders to determine the revocation status of an X.509 client certificate. An OCSP responder (a server typically run by the certificate issuer) may return a signed response signifying that the certificate specified in the request is 'good', 'revoked', or 'unknown'. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. If the certificate truly has been revoked, this tool will also confirm it. The speedup of CRLite versus OCSP was rather stark; 56% of the time, CRLite was over 100 milliseconds faster than OCSP, which is a substantial and perceptible improvement in browsing performance. In this situation it is … OCSP Checker is a browser extension for Chrome that performs an OCSP request to obtain the revocation status of all used SSL certificates on the currently visited website. I'm just thinking of a [probably] atypical scenario. But then, since it is quite possible to run OCSP over SSL/TLS, why is encryption not explicitly supported, but signing is? HTTP method used to send OCSP requests. Several open source and proprietary OCSP implementations exist, including fully featured servers and libraries for building custom applications. If SSL cert is issued by the same authority as certificate being checked, then … OCSP Certification Checks Require Port 80¶ All communication with Snowflake happens using port 443. OCSP over DNS (ODIN) This project is aimed at standardizing DNS as a transport protocol for OCSP responses. The MustStaple TLS extension in a certificate can require that the certificate be verified by a stapled OCSP response, mitigating this problem. OCSP offers significant advantages over certificate revocation lists (CRLs) in terms of timely information. Yes, it is possible using SSL/TLS. What's the risk? The key that signs a response need not be the same key that signed the certificate. But it’s the position they occur at in the waterfall that is important. In other words, the signatures protect integrity at rest. Washington state. OCSP can be vulnerable to replay attacks,[5] where a signed, 'good' response is captured by a malicious intermediary and replayed to the client at a later date after the subject certificate may have been revoked. For requests, less than 255 bytes long, you can configure the HTTP GET method for queries to an OCSP server. I own a company for which I run a private CA, and I don't want any rival company to know which users I am revoking: a revoked user means that he/she is a [probably] fired employee, and they would [probably] be able to bribe him/her in order to gain private information. The Online Certificate Status Protocol (OCSP) is an Internet protocol used for obtaining the revocation status of an X.509 digital certificate. unresolvable dependencies. Starting from Windows Server 2008, Microsoft launched a feature called Online Certificate Status Protocol, or in short OCSP. Now admittedly a couple of TCP connections (over HTTP, not HTTPS) to another domain isn’t a big deal (especially considering the number of JavaScript requests on sites nowadays). Citrix ADC appliances support OCSP as defined in RFC 2560. Using HTTPS transport could be be a good idea there. A little over a month ago, we published a couple of blog posts about how we were making SSL faster. There is wide support for OCSP amongst most major browsers: However, Google Chrome is an outlier. Why would a civilization only be able to walk counterclockwise around a thing they're looking at? Why? The Online Certificate Status Protocol (OCSP) is an Internet protocol used for obtaining the revocation status of an X.509 digital certificate. If you specify the GET method but the length is greater than 255 bytes, the appliance uses the default method (POST). In HTTPS, the communication protocol is encrypted using Transport Layer Security (TLS) or, formerly, Secure Sockets Layer (SSL). Is there a bias against mentioning your name on presentation slides? OCSP client support is built into many operating systems, web browsers, and other network software due to the popularity of HTTPS and the World Wide Web. validation! OCSP discloses to the responder that a particular network host used a particular certificate at a particular time. It is described in RFC 6960 and is on the Internet standards track. URI (or similar scheme) in the authorityInfoAccess or And Connection: Keep-Alive headers. [3] OCSP also remains a valid defense against situations where the attacker is not a "man-in-the-middle" (code-signing or certificates issued in error). OCSP requests may be chained between peer responders to query the issuing CA appropriate for the subject certificate, with responders validating each other's responses against the root CA using their own OCSP requests. Where privacy is a requirement, OCSP transactions exchanged using HTTP MAY be protected using either TLS/SSL or some other lower layer protocol. Thus, the replay attack is a major threat to validation systems. Forcing internal servers to connect to the internet in order to use OCSP contributes to the De-perimeterisation trend. Now you have a different certificate to verify: the issuer ’s OCSP responder’s TLS … If your workstation is behind a firewall, make sure that the network administrator for your organization has opened the firewall to traffic on ports 443 and 80. An OCSP responder may be queried for revocation information by delegated path validation (DPV) servers. OCSP can support more than one level of CA. This section addresses the problem using https for CRL distribution points. Join Stack Overflow to learn, share knowledge, and build your career. To learn more, see our tips on writing great answers. It would allow man in the middle or my ISP to spy on the apps I am using and when. Bob has stored Carol's public key sometime before this transaction. OCSP stapling is a way to verify validity without disclosing browsing behavior to the CA. OCSP allows a nonce to be included in the request that may be included in the corresponding response. For S/MIME email or other applications, OCSP requests could be a lot more sensitive, because they would support organizational analysis. Online Certificate Status Protocol (OCSP) is an Internet protocol that is used to determine the status of a client SSL certificate. In the appendix of the RFC2560 is the following written: A.1.1 Request Episode 306: Gaming PCs to heat your home, oceans to cool your data centers, Can you use gzip over SSL? it causes a chicken-and-egg problem when checking for the TLS certificate and; it is simply a waste of resources, given that the CRL is by definition signed by a CA, and a non-confidential artifact. This page was last edited on 14 January 2021, at 04:46. How were scientific plots made in the 1960s? HTTP port 80 is normal for OCSP/CRL servers, and as it is a security protocol, should normally be possible to make an exception for in your company's security policies. PKI is important to using public key cryptography effectively, and is essential to understanding and using the SSL protocol. If you'd think more from a Integrity instead of confidentiality. Messages communicated via OCSP are encoded in ASN.1 and are usually communicated over HT… Earlier today, someone reported to the mozilla.dev.security.policy mailing list that they were unable to access any Google websites over HTTPS because Google's OCSP responder was down.David E. Ross says the problem started two days ago, and several Tweets confirm this.Google has since acknowledged the report.As of publication time, the responder is still … Stack Overflow for Teams is a private, secure spot for you and Bob completes the transaction with Alice. subjectInfoAccess extensions. Alice wishes to perform a transaction with Bob and sends him her public key certificate. December 11, 2012 5:24PM OCSP Speed & Reliability HTTPS SSL Security. Snowflake will continue to work with the industry (CAs and cloud platforms) to ensure they provide maximum availability of their infrastructure for OCSP. Or the example that erickson gave below, which seems much more typical. Over the month of data, CRLite was faster to query than OCSP 98.844% of the time. Symantec says that Google and other browser vendors should help fix OCSP instead of giving up on it. A OCSP revocation check to a responder requires opening one or more TCP connections. <2> Section 2.1: OCSP Extensions conform to OCSP over HTTP as specified in Appendix A. I think it would be possible to perform MiTM attack, giving an incorrect status about a certificate revocation status, forcing a user to use it's old -compromised- certificate. OCSP is being used now, and OCSP Stapling is an improved method of OCSP that you can decide to use. Without the stapled OCSP certificate being presented by the HTTPS server, it is the responsibility of the connecting client (e.g., web browser) to use traditional OCSP or CRL queries to CAs to obtain revocation information. But the most OCSP-Responder only provide HTTP without TLS/SSL. 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